GE Multilin 850 User manual

Instruction manual
850 version: 2.2x
GE publication code: 1601-0298-AD (GEK-119591N)
*1601-0298-AD*
850
Feeder Protection System
Feeder protection and control
GE
Grid Solutions

© 2018 GE Multilin Incorporated. All rights reserved.
GE Multilin 850 Feeder Protection System instruction manual for revision 2.2x.
850 Feeder Protection System, EnerVista, EnerVista Launchpad, and EnerVista 8 Series
Setup software are registered trademarks of GE Multilin Inc.
The contents of this manual are the property of GE Multilin Inc. This documentation is
furnished on license and may not be reproduced in whole or in part without the permission
of GE Multilin. The content of this manual is for informational use only and is subject to
change without notice.
Part number: 1601-0298-AD (March 2018)
Note May contain components with FCC ID: XF6-RS9110N1122
and IC ID: 8407A-RS9110N1122.

850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL I
Table of Contents
1.INTRODUCTION Overview .............................................................................................................................................. 1 - 2
Description of the 850 Feeder Protection System............................................................ 1 - 3
Security Overview............................................................................................................................ 1 - 9
850 Order Codes.............................................................................................................................1 - 11
Specifications...................................................................................................................................1 - 16
Device .......................................................................................................................................................... 1 - 16
Protection................................................................................................................................................... 1 - 16
Control......................................................................................................................................................... 1 - 26
Monitoring.................................................................................................................................................. 1 - 28
Recording................................................................................................................................................... 1 - 29
User-Programmable Elements ........................................................................................................ 1 - 30
Metering...................................................................................................................................................... 1 - 31
Inputs ........................................................................................................................................................... 1 - 33
Outputs........................................................................................................................................................ 1 - 35
Power Supply ........................................................................................................................................... 1 - 38
Communications .................................................................................................................................... 1 - 38
Testing & Certification.......................................................................................................................... 1 - 40
Physical....................................................................................................................................................... 1 - 41
Environmental.......................................................................................................................................... 1 - 41
Cautions and Warnings ..............................................................................................................1 - 42
Safety words and definitions............................................................................................................ 1 - 42
General Cautions and Warnings..................................................................................................... 1 - 42
Must-read Information................................................................................................................1 - 44
Storage........................................................................................................................................................ 1 - 45
For Further Assistance.................................................................................................................1 - 46
Repairs......................................................................................................................................................... 1 - 46
2.INSTALLATION Mechanical Installation................................................................................................................. 2 - 1
Product Identification..............................................................................................................................2 - 1
Dimensions...................................................................................................................................................2 - 2
Mounting .......................................................................................................................................................2 - 3
Standard Panel Mount.............................................................................................................................2 - 4
Depth Reducing Collar.............................................................................................................................2 - 5
Draw-out Unit Withdrawal and Insertion ......................................................................................2 - 7
Removable Power Supply .....................................................................................................................2 - 8
Removable Magnetic Module..............................................................................................................2 - 9
Remote Module I/O (RMIO)................................................................................................................. 2 - 10
IP20 Back Cover ...................................................................................................................................... 2 - 12
Arc Flash Sensor ..................................................................................................................................... 2 - 13
Sensor Fiber Handling & Storage ....................................................................................................2 - 13
Sensor Installation..................................................................................................................................2 - 14
Electrical Installation ....................................................................................................................2 - 14
Typical Wiring Diagram....................................................................................................................... 2 - 14
Terminal Identification......................................................................................................................... 2 - 18
Wire Size......................................................................................................................................................2 - 25
RMIO Module Installation.................................................................................................................... 2 - 26
Phase Sequence and Transformer Polarity............................................................................... 2 - 27
Ground CT Inputs.................................................................................................................................... 2 - 28
Voltage Inputs.......................................................................................................................................... 2 - 30
Restricted Ground Fault Inputs........................................................................................................ 2 - 30
Zero-Sequence CT Installation......................................................................................................... 2 - 31

II 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
Control Power...........................................................................................................................................2 - 32
Contact Inputs..........................................................................................................................................2 - 33
Output Relays...........................................................................................................................................2 - 34
Serial Communications ........................................................................................................................2 - 37
IRIG-B............................................................................................................................................................2 - 38
3.INTERFACES Front Control Panel Interface......................................................................................................3 - 2
850 Graphical Display Pages .............................................................................................................. 3 - 4
Working with Graphical Display Pages .......................................................................................... 3 - 6
Single Line Diagram................................................................................................................................. 3 - 9
Rugged and Membrane (3 PB) Front Panel LEDs .....................................................................3 - 11
Ten (10) Pushbutton Membrane Front Panel LEDs .................................................................3 - 13
Home Screen Icons................................................................................................................................3 - 15
Relay Messages.......................................................................................................................................3 - 17
Target Messages.....................................................................................................................................3 - 17
Self-Test Errors.........................................................................................................................................3 - 17
Out of Service............................................................................................................................................3 - 21
Flash Messages........................................................................................................................................3 - 21
Label Removal..........................................................................................................................................3 - 21
Software Interface ........................................................................................................................ 3 - 23
EnerVista 8 Series Setup Software..................................................................................................3 - 23
Hardware & Software Requirements ............................................................................................3 - 23
Installing the EnerVista 8 Series Setup Software.....................................................................3 - 24
Upgrading the Software ......................................................................................................................3 - 26
Connecting EnerVista 8 Series Setup software to the Relay..............................................3 - 27
Using the Quick Connect Feature ...................................................................................................3 - 27
Configuring Ethernet Communications........................................................................................3 - 28
Connecting to the Relay ......................................................................................................................3 - 30
Working with Setpoints & Setpoints Files ....................................................................................3 - 31
Engaging a Device..................................................................................................................................3 - 31
Entering Setpoints ..................................................................................................................................3 - 31
File Support................................................................................................................................................3 - 32
Using Setpoints Files..............................................................................................................................3 - 33
Downloading & Saving Setpoints Files..........................................................................................3 - 33
Adding Setpoints Files to the Environment.................................................................................3 - 34
Creating a New Setpoints File...........................................................................................................3 - 35
Upgrading Setpoints Files to a New Revision............................................................................3 - 36
Printing Setpoints....................................................................................................................................3 - 37
Printing Values from a Connected Device...................................................................................3 - 38
Loading Setpoints from a File ...........................................................................................................3 - 38
Uninstalling Files and Clearing Data..............................................................................................3 - 39
Quick Setup................................................................................................................................................3 - 39
Upgrading Relay Firmware................................................................................................................3 - 42
Loading New Relay Firmware...........................................................................................................3 - 42
Advanced EnerVista 8 Series Setup Software Features .......................................................3 - 46
SLD Configurator.....................................................................................................................................3 - 46
FlexCurve Editor.......................................................................................................................................3 - 53
Transient Recorder (Waveform Capture).....................................................................................3 - 54
Protection Summary.............................................................................................................................3 - 58
Offline Settings File Conversion........................................................................................................3 - 60
Convert SR 750/760 Files ....................................................................................................................3 - 60
Conversion Summary Report............................................................................................................3 - 61
Results Window .......................................................................................................................................3 - 62
4.ABOUT SETPOINTS Setpoints Entry Methods...............................................................................................................4 - 2
Common Setpoints ..........................................................................................................................4 - 3

850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL III
Logic Diagrams................................................................................................................................. 4 - 5
Setpoints Text Abbreviations...................................................................................................... 4 - 6
5.DEVICE, SYSTEM,
INPUT AND OUTPUT
SETPOINTS
Device.................................................................................................................................................... 5 - 2
Custom Configuration.............................................................................................................................5 - 2
Clock................................................................................................................................................................5 - 4
Real-time Clock...........................................................................................................................................5 - 4
PTP Configuration......................................................................................................................................5 - 5
Clock.................................................................................................................................................................5 - 7
IRIG-B.........................................................................................................................................................5 - 8
SNTP Protocol ..............................................................................................................................................5 - 8
Security ..........................................................................................................................................................5 - 8
Basic Security...........................................................................................................................................5 - 10
CyberSentry ..............................................................................................................................................5 - 12
Communications .................................................................................................................................... 5 - 19
Modbus Protocol .....................................................................................................................................5 - 19
RS485............................................................................................................................................................5 - 21
WiFi................................................................................................................................................................5 - 21
WiFi Quick Start Procedure ..........................................................................................................5 - 23
USB ................................................................................................................................................................5 - 24
Ethernet Ports...........................................................................................................................................5 - 24
Network Settings Menu..................................................................................................................5 - 25
Routing.........................................................................................................................................................5 - 26
DNP Protocol.............................................................................................................................................5 - 29
DNP / IEC104 Point Lists ......................................................................................................................5 - 30
IEC 60870-5-104 .....................................................................................................................................5 - 33
IEC 60870-5-103 .....................................................................................................................................5 - 35
IEC 61850....................................................................................................................................................5 - 35
The IEC 61850 Configurator.........................................................................................................5 - 35
IEC 61850 Configurator Details..................................................................................................5 - 37
Remote Modbus Device.......................................................................................................................5 - 38
Transient Recorder ................................................................................................................................ 5 - 39
Data Logger .............................................................................................................................................. 5 - 40
Fault Reports ............................................................................................................................................ 5 - 43
Event Data ................................................................................................................................................. 5 - 45
Flex States.................................................................................................................................................. 5 - 46
Front Panel ................................................................................................................................................ 5 - 46
Programmable LEDs..............................................................................................................................5 - 46
Programmable Pushbuttons .............................................................................................................5 - 49
Ten (10) Pushbutton Membrane Front Panel Defaults ..........................................................5 - 54
Annunciator...............................................................................................................................................5 - 55
Tab Pushbuttons .....................................................................................................................................5 - 58
Display Properties ..................................................................................................................................5 - 61
Default Screens........................................................................................................................................5 - 62
Home Screens..........................................................................................................................................5 - 62
Clear Records ........................................................................................................................................... 5 - 63
Resetting..................................................................................................................................................... 5 - 63
Installation................................................................................................................................................. 5 - 64
System ................................................................................................................................................5 - 65
Current Sensing....................................................................................................................................... 5 - 65
Voltage Sensing ...................................................................................................................................... 5 - 66
Traditional VT............................................................................................................................................5 - 66
LEA (Low Energy Analog) .................................................................................................................... 5 - 68
Power System .......................................................................................................................................... 5 - 69
Breakers...................................................................................................................................................... 5 - 70
Switches...................................................................................................................................................... 5 - 73

IV 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
FlexCurves..................................................................................................................................................5 - 76
Inputs...................................................................................................................................................5 - 84
Contact Inputs..........................................................................................................................................5 - 85
Virtual Inputs.............................................................................................................................................5 - 88
Analog Inputs............................................................................................................................................5 - 90
Remote Inputs ..........................................................................................................................................5 - 94
Outputs...............................................................................................................................................5 - 95
Output Relays...........................................................................................................................................5 - 95
Output Relay 1 (F1) Trip........................................................................................................................5 - 98
Output Relay 2 (F4) programmed as Close..............................................................................5 - 100
Auxiliary Output Relays ....................................................................................................................5 - 102
Critical Failure Relay #8....................................................................................................................5 - 103
Virtual Outputs ......................................................................................................................................5 - 104
Analog Outputs.....................................................................................................................................5 - 105
6.PROTECTION
SETPOINTS
Current Elements ..............................................................................................................................6 - 3
Inverse Time Overcurrent Curves...................................................................................................... 6 - 4
Percent of Load-To-Trip.......................................................................................................................6 - 11
Phase Time Overcurrent Protection (51P)....................................................................................6 - 11
Phase Instantaneous Overcurrent Protection (50P) ...............................................................6 - 15
Phase Directional Overcurrent Protection (67P).......................................................................6 - 17
Neutral Time Overcurrent Protection (51N) ................................................................................6 - 20
Neutral Instantaneous Overcurrent Protection (50N)............................................................6 - 23
Neutral Directional Overcurrent Protection (67N) ...................................................................6 - 26
Ground Time Overcurrent Protection (51G) ................................................................................6 - 31
Ground Instantaneous Overcurrent Protection (50G)............................................................6 - 34
Ground Directional Overcurrent Protection (67G) ...................................................................6 - 36
Sensitive Ground Time Overcurrent Protection (51SG)..........................................................6 - 41
Sensitive Ground Instantaneous Overcurrent Protection (50SG) .....................................6 - 44
Sensitive Ground Directional Overcurrent Protection (67SG).............................................6 - 47
Restricted Ground Fault (87G)...........................................................................................................6 - 52
Switch on to Fault (SOTF).....................................................................................................................6 - 57
Negative Sequence Time Overcurrent Protection (51_2).....................................................6 - 60
Negative Sequence Instantaneous Overcurrent Protection (50_2).................................6 - 63
Negative Sequence Directional Overcurrent Protection (67_2) ........................................6 - 66
Broken Conductor...................................................................................................................................6 - 70
Load Encroachment ..............................................................................................................................6 - 73
Undercurrent (37)....................................................................................................................................6 - 76
Thermal Overload (49)...........................................................................................................................6 - 79
Voltage Elements...........................................................................................................................6 - 83
Undervoltage Curves.............................................................................................................................6 - 83
Phase Undervoltage Protection (27P)............................................................................................6 - 85
Timed Undervoltage Protection (27T)............................................................................................6 - 88
UV Reactive Power (27Q) .....................................................................................................................6 - 97
Auxiliary Undervoltage (27X) ..........................................................................................................6 - 104
Phase Overvoltage Protection (59P)............................................................................................6 - 106
Auxiliary Overvoltage Protection (59X) ......................................................................................6 - 109
Neutral Overvoltage Protection (59N) ........................................................................................6 - 112
Negative Sequence Overvoltage Protection (59_2).............................................................6 - 115
Admittance .................................................................................................................................... 6 - 118
Neutral Admittance (21YN)..............................................................................................................6 - 118
Power Elements........................................................................................................................... 6 - 126
Directional Power (32)........................................................................................................................6 - 127
Wattmetric Ground Fault (32N) .....................................................................................................6 - 132
Frequency Elements ................................................................................................................. 6 - 137

850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL V
Underfrequency (81U)........................................................................................................................6 - 138
Overfrequency (81O)...........................................................................................................................6 - 141
Frequency Rate of Change (81R) ..................................................................................................6 - 144
Fast Underfrequency..........................................................................................................................6 - 148
7.MONITORING Trip and Close Circuit Monitoring ............................................................................................. 7 - 2
Breaker Arcing Current................................................................................................................7 - 10
Breaker Health ................................................................................................................................7 - 13
Functions............................................................................................................................................7 - 17
Power Factor (55).................................................................................................................................... 7 - 17
Demand ...................................................................................................................................................... 7 - 23
Current Demand......................................................................................................................................7 - 24
Real Power Demand..............................................................................................................................7 - 26
Reactive Power ........................................................................................................................................7 - 28
Apparent Power Demand ...................................................................................................................7 - 30
Pulsed Outputs ........................................................................................................................................ 7 - 32
Digital Counters....................................................................................................................................... 7 - 35
Harmonic Detection......................................................................................................................7 - 38
Transient Ground Fault Detection..........................................................................................7 - 41
RTD Temperature...........................................................................................................................7 - 45
RTD Trouble.......................................................................................................................................7 - 50
Loss of Communications............................................................................................................7 - 51
8.CONTROL Setpoint Group .................................................................................................................................. 8 - 2
Local Control Mode (breakers and switches)...................................................................... 8 - 4
Breaker Control (2).........................................................................................................................8 - 13
Switch Control (9) ...........................................................................................................................8 - 16
Pole Discordance (52)...................................................................................................................8 - 19
Virtual Input Control......................................................................................................................8 - 25
Trip Bus ...............................................................................................................................................8 - 26
Breaker Failure (50BF)..................................................................................................................8 - 28
Setup ............................................................................................................................................................ 8 - 29
Initiate.......................................................................................................................................................... 8 - 32
Arc Flash Protection......................................................................................................................8 - 34
Synchrocheck (25) .........................................................................................................................8 - 36
Manual Close Blocking.................................................................................................................8 - 41
Cold Load Pickup............................................................................................................................8 - 44
Undervoltage Restoration..........................................................................................................8 - 48
Underfrequency Restoration....................................................................................................8 - 52
Bus Transfer......................................................................................................................................8 - 56
ATS Wiring Diagrams............................................................................................................................ 8 - 75
Autoreclose.......................................................................................................................................8 - 79
Setup ............................................................................................................................................................ 8 - 81
Initiate.......................................................................................................................................................... 8 - 87
Shot............................................................................................................................................................... 8 - 88
Rate Supervision ..................................................................................................................................... 8 - 90
Current Supervision............................................................................................................................... 8 - 92
Zone Coordination ................................................................................................................................. 8 - 95
CT Supervision .................................................................................................................................8 - 98
VT Fuse Failure (VTFF)................................................................................................................8 - 105

VI 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
9.FLEXLOGIC AND
OTHER SETPOINTS
FlexLogic...............................................................................................................................................9 - 3
Timers...........................................................................................................................................................9 - 14
Non-volatile Latches .............................................................................................................................9 - 15
FlexLogic Equation .................................................................................................................................9 - 16
Viewing FlexLogic Graphics ...............................................................................................................9 - 18
FlexElements.............................................................................................................................................9 - 18
Testing.................................................................................................................................................9 - 25
Simulation...................................................................................................................................................9 - 26
Setup.............................................................................................................................................................9 - 26
Pre-Fault......................................................................................................................................................9 - 27
Fault ..............................................................................................................................................................9 - 28
Post-Fault ...................................................................................................................................................9 - 29
Test LEDs.....................................................................................................................................................9 - 30
Contact Inputs..........................................................................................................................................9 - 30
Output Relays...........................................................................................................................................9 - 30
10.STATUS Summary...........................................................................................................................................10 - 2
Configurable SLD ....................................................................................................................................10 - 2
Annunciator...............................................................................................................................................10 - 2
Tab Pushbuttons .....................................................................................................................................10 - 3
Breakers.............................................................................................................................................10 - 4
Information.......................................................................................................................................10 - 5
Main CPU.....................................................................................................................................................10 - 5
Comms CPU...............................................................................................................................................10 - 5
Hardware Versions.................................................................................................................................10 - 6
Environment..............................................................................................................................................10 - 6
Settings Audit............................................................................................................................................10 - 7
Switches.............................................................................................................................................10 - 7
Last Trip Data ..................................................................................................................................10 - 7
Arc Flash ............................................................................................................................................10 - 8
Contact Inputs.................................................................................................................................10 - 8
Output Relays..................................................................................................................................10 - 8
Output Relay 1 (TRIP).............................................................................................................................10 - 8
Output Relay 2 (CLOSE) ........................................................................................................................10 - 8
Virtual Inputs....................................................................................................................................10 - 9
Virtual Outputs................................................................................................................................10 - 9
Flex State........................................................................................................................................ 10 - 10
Communications......................................................................................................................... 10 - 10
GOOSE Rx and Tx .................................................................................................................................10 - 10
Device Status................................................................................................................................ 10 - 14
Clock Status................................................................................................................................... 10 - 15
PTP Status....................................................................................................................................... 10 - 15
Autoreclose.................................................................................................................................... 10 - 16
11.METERING Summary...........................................................................................................................................11 - 4
Admittance .......................................................................................................................................11 - 5
Neutral Admittance................................................................................................................................11 - 5
Currents..............................................................................................................................................11 - 5
Voltages .............................................................................................................................................11 - 7
Frequency.........................................................................................................................................11 - 8
Fast Underfrequency................................................................................................................... 11 - 9
Harmonics 1(Harmonics 2)........................................................................................................11-9

850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL VII
Harmonic Detection...................................................................................................................11 - 10
Synchrocheck...............................................................................................................................11 - 10
Power................................................................................................................................................11 - 11
Energy..............................................................................................................................................11 - 13
Power Factor.................................................................................................................................11 - 13
Current Demand..........................................................................................................................11 - 14
Power Demand ............................................................................................................................11 - 14
Thermal Capacity........................................................................................................................11 - 15
Directional Power........................................................................................................................11 - 15
Wattmetric Ground Fault ........................................................................................................ 11 - 15
Transient Ground Fault Detection.......................................................................................11 - 16
CT Supervision (CTS)...................................................................................................................11 - 16
Arc Flash..........................................................................................................................................11 - 17
RTDs...................................................................................................................................................11 - 17
RRTDs................................................................................................................................................11 - 17
RTD Maximums ............................................................................................................................11 - 18
RRTD Maximums .........................................................................................................................11 - 18
Analog Inputs................................................................................................................................11 - 18
FlexElements .................................................................................................................................11 - 19
12.RECORDS Events ..................................................................................................................................................12 - 1
Transient Records..........................................................................................................................12 - 2
Data Logger......................................................................................................................................12 - 2
Fault Reports....................................................................................................................................12 - 2
Breakers Records...........................................................................................................................12 - 4
Breaker Arcing Current........................................................................................................................ 12 - 4
Breaker Health......................................................................................................................................... 12 - 4
Digital Counters ..............................................................................................................................12 - 5
Remote Modbus Device..............................................................................................................12 - 6
Clear Records...................................................................................................................................12 - 8
13.MAINTENANCE Environmental Health Report...................................................................................................13 - 2
General Maintenance...................................................................................................................13 - 4
In-service Maintenance....................................................................................................................... 13 - 4
Out-of-service Maintenance............................................................................................................. 13 - 4
Unscheduled Maintenance (System Interruption).................................................................. 13 - 4
A.APPENDIX A Warranty.............................................................................................................................................. A - 1
Revision history................................................................................................................................. A - 1
Major Updates ............................................................................................................................................A - 2

VIII 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL

850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–1
850 Feeder Protection System
Chapter 1: Introduction
GE
Grid Solutions
Introduction
The Multilin™ 850 relay is a member of the Multilin 8 Series protective relay platform
designed for the management, protection and control of feeder applications. The Multilin
850-D variant is used to provide primary (main) or backup protection for underground and
overhead feeders for utility and industrial power networks.
The 850-D variant, with support for up to eight CT inputs and two sets of four traditional VT
inputs, provides effective protection, control and monitoring of two distribution feeders.
This feature also offer redundancy with the same number of devices.
The 850-P variant, with support for up to twelve CT inputs and six Low voltage Analog(LEA)
(or four traditional VT inputs) provides multi-feeder protection, control and monitoring
support for three-way or four-way Pad mount switchgear or RMUs, using single box.

1–2 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
OVERVIEW CHAPTER 1: INTRODUCTION
Overview
Each relay provides protection, control, and monitoring functions with both local and
remote human interfaces. They also display the present trip/alarm conditions, and most of
the more than 35 measured system parameters. Recording of past trip, alarm or control
events, maximum demand levels, and energy consumption is also performed.
These relays contain many innovative features. To meet diverse utility standards and
industry requirements, these features have the flexibility to be programmed to meet
specific user needs. This flexibility will naturally make a piece of equipment difficult to
learn. To aid new users in getting basic protection operating quickly, setpoints are set to
typical default values and advanced features are disabled. These settings can be
reprogrammed at any time.
Programming can be accomplished with the front panel keys and display. Due to the
numerous settings, this manual method can be somewhat laborious. To simplify
programming and provide a more intuitive interface, setpoints can be entered with a PC
running the EnerVista 8 Setup software provided with the relay. Even with minimal
computer knowledge, this menu-driven software provides easy access to all front panel
functions. Actual values and setpoints can be displayed, altered, stored, and printed. If
settings are stored in a setpoint file, they can be downloaded at any time to the front panel
program port of the relay via a computer cable connected to the USB port of any personal
computer.
A summary of the available functions and a single-line diagram of protection and control
features is shown below. For a complete understanding of each feature operation, refer to
Chapter 4: Setpoints. The logic diagrams include a reference to every setpoint related to a
feature and show all logic signals passed between individual features. Information related
to the selection of settings for each setpoint is also provided.

CHAPTER 1: INTRODUCTION DESCRIPTION OF THE 850 FEEDER PROTECTION SYSTEM
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–3
Description of the 850 Feeder Protection System
CPU
Relay functions are controlled by two processors: a Freescale MPC5125 32-bit
microprocessor that measures all analog signals and digital inputs and controls all output
relays, and a Freescale MPC8358 32-bit microprocessor that controls all the advanced
Ethernet communication protocols.
Analog Input and Waveform Capture
Magnetic transformers are used to scale-down the incoming analog signals from the
source instrument transformers. The analog signals are then passed through a 11.5 kHz
low pass analog anti-aliasing filter. All signals are then simultaneously captured by sample
and hold buffers to ensure there are no phase shifts. The signals are converted to digital
values by a 16-bit A/D converter before finally being passed on to the CPU for analysis.
The 'raw' samples are scaled in software, then placed into the waveform capture buffer,
thus emulating a fault recorder. The waveforms can be retrieved from the relay via the
EnerVista 8 Series Setup software for display and diagnostics.
Frequency
Frequency measurement is accomplished by measuring the time between zero crossings
of the composite signal of three-phase bus voltages, line voltage or three-phase currents.
The signals are passed through a low pass filter to prevent false zero crossings. Frequency
tracking utilizes the measured frequency to set the sampling rate for current and voltage
which results in better accuracy for the Discrete Fourier Transform (DFT) algorithm for off-
nominal frequencies.
The main frequency tracking source uses three-phase bus voltages. The frequency
tracking is switched automatically by an algorithm to the alternative reference source, i.e.,
three-phase currents signal or line voltage for the configuration of tie-breaker, if the
frequency detected from the three-phase voltage inputs is declared invalid. The switching
will not be performed if the frequency from the alternative reference signal is detected
invalid. Upon detecting valid frequency on the main source, the tracking will be switched
back to the main source. If a stable frequency signal is not available from all sources, then
the tracking frequency defaults to the nominal system frequency.
Phasors, Transients, and Harmonics
All waveforms are processed eight times every cycle with a DC decaying removal filter and
a Discrete Fourier Transform (DFT). The resulting phasors have fault current transients and
all harmonics removed. This results in an overcurrent relay that is extremely secure and
reliable and one that will not overreach.
Processing of AC Current Inputs
The DC Decaying Removal Filter is a short window digital filter, which removes the DC
decaying component from the asymmetrical current present at the moment a fault
occurs. This is done for all current signals used for overcurrent protection; voltage signals
use the same DC Decaying Removal Filter. This filter ensures no overreach of the
overcurrent protection.
The Discrete Fourier Transform (DFT) uses exactly one cycle of samples to calculate a
phasor quantity which represents the signal at the fundamental frequency; all harmonic
components are removed. All subsequent calculations (e.g. power, etc.) are based upon the
current and voltage phasors, such that the resulting values have no harmonic
components. RMS (root mean square) values are calculated from one cycle of samples
prior to filtering.
Protection Elements
All voltage, current and frequency protection elements are processed eight times every
cycle to determine if a pickup has occurred or a timer has expired. The voltage and current
protection elements use RMS current/voltage, or the magnitude of the phasor.

1–4 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
DESCRIPTION OF THE 850 FEEDER PROTECTION SYSTEM CHAPTER 1: INTRODUCTION
Figure 1-1: 850-E and 850-D (Single Feeder System) Single Line Diagram
Figure 1-2: 850-D Single Line Diagram, Dual Feeder System
892770A6.CDR
3 CTs
CT
27P 59P 59N 59_2 VTFF 81U 81O 81R
51N 50N 67N
87G
27X 59X
METERING
TRANSIENT RECORDER
EVENT RECORDER
FAULT REPORT
LOAD
BUS
TRIP
52
CLOSE
MONITORING
CLP50BF 51P 50P 67P 51_2 50_2 67_2 49
50G/
51G
51G 50G 67G
50G/
51G
51SG 50SG 67SG
25
32N
V_2
BUS
BREAKER
32
850E/850D Single Feeder Protection System
V_0
POLE DISCORDANCE*
SOTF*
Fast Underfrequency
UV Restoration
UF Restoration
Bus Transfer
MCB
LIGHT
Broken Conductor
Load Encroachment
CT Supervision
Demand
Pulsed Outputs
Harmonic Detection
37*
21YN 27Q 27T
79
AFP
* 850-D only
55
.
3CTs
CT
27P 59P 59N 59_2 VTFF 81U 81O 81R
51N 50N 67N
RGF
FAULT REPORT
EVENT RECORDER
TRANSIENT RECORDER
METERING
LOAD
BUS
TRIP
52
CLOSE
MONITORING
CLP
50BF 51P 50P 67P 51_2 50_2 67_2 49
50G/
51G
51G 50G 67G
50G/
51G
51SG 50SG 67SG
32N
V_2
BUS
BREAKER
32
850-D Dual Feeder Protection System
V_0
POLE DISCORDANCE
SOTF
Fast Underfrequency
UV Restoration
UF Restoration
MCB
LIGHT
Broken Conductor
Load Encroachment
CT Supervision
Demand
Pulsed Outputs
Harmonic Detection
37
21YN 27Q 27T
79
AFP 55
3CTs
LOAD
52
BREAKER
MONITORING
POLE DISCORDANCE
MCB 79
CLOSETRIP
3VTs 3VTs
Aux VT
27X 59X 25
894211A1.cdr

CHAPTER 1: INTRODUCTION DESCRIPTION OF THE 850 FEEDER PROTECTION SYSTEM
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–5
Figure 1-3: 850-P Single Line Diagram
Table 1-1: Model-specific ANSI Device Numbers and Functions
ANSI
Device
Description 850-E
Industrial
850-D
Distribution
850-P
Padmount
21YN Neutral Admittance Y (3) Y (3)
25 Synchrocheck Y Y
27P Phase Undervoltage Y (4) Y (8) Y (8)
27Q UV Reactive Power Y (4) Y (4)
27T Timed Undervoltage Protection Y (4) Y (4)
27X Auxiliary Undervoltage Y (2) Y (4)
32 Directional Power Y (4) Y (4)
32N Wattmetric Ground Fault (Wattmetric zero sequence directional) Y (4) Y (4)
37 Undercurrent Y (3)
49 Thermal Overload Y (2) Y (2)
50BF Breaker Failure Y (2) Y (4) Y (4)
50G Ground Instantaneous Overcurrent Y (1) Y (8) Y (12)
50SG Sensitive Ground Instantaneous Overcurrent Y (1) Y (4)
50N Neutral Instantaneous Overcurrent Y (2) Y (8) Y (16)
50P Phase Instantaneous Overcurrent Y (2) Y (8) Y (16)
50_2 Negative Sequence Instantaneous Overcurrent Y (1) Y (8) Y (16)
51G Ground Time Overcurrent Y (1) Y (4) Y (6)
51SG Sensitive Ground Time Overcurrent Y (1) Y (2)
51N Neutral Time Overcurrent Y (2) Y (4) Y (8)
51P Phase Time Overcurrent Y (2) Y (4) Y (8)
51_2 Negative Sequence Time Overcurrent Y (1) Y (4) Y (8)
52 AC Circuit Breaker Y (3)
Pole Discordance Y (3)
55 Power Factor Y Y
3CTs
51N 50N
METERING
TRANSIENT RECORDER
EVENT RECORDER
FAULT REPORT
BUS
TRIP CLOSE
MONITORING
50BF 51P 50P 51_2 50_2
50G/
51G
51G 50G
BUS
Switch
850P Padmount Protection System
MCB
Demand
Pulsed Outputs
Harmonic Detection
AFP
3CTs
Switch
59N 27P59P59_2
3CTs
LOAD
52 BREAKER
3CTs
LOAD
52 BREAKER
LEA1
LEA2
894212A1.cdr

1–6 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
DESCRIPTION OF THE 850 FEEDER PROTECTION SYSTEM CHAPTER 1: INTRODUCTION
59N Neutral Overvoltage Y (4) Y (4) Y (4)
59P Phase Overvoltage Y (4) Y (4)
59X Auxiliary Overvoltage Y (2) Y (4)
59_2 Negative Sequence Overvoltage Y (2) Y (4) Y (4)
67G Ground Directional Element Y (1) Y (2)
67SG Sensitive Ground Directional Element Y (1) Y (1)
67N Neutral Directional Element Y (1) Y (4)
67P Phase Directional Element Y (1) Y (4)
67_2 Negative Sequence Directional Element Y (1) Y (2)
79 Automatic Recloser Y (1) Y (2)
81O Overfrequency Y (6) Y (12)
81U Underfrequency Y (6) Y (12)
81R Frequency Rate of Change Y (6) Y (12)
87G Restricted Ground Fault (RGF) Y Y
AFP Arc Flash Protection Y (4) Y (4)
CLP Cold Load Pickup Y (1) Y (2)
I1/12 Broken Conductor Y (1) Y (3)
MTM Automatic Bus Transfer Scheme Y Y
MCB Manual Close Blocking Y Y Y
SOTF Switch on to Fault Y (3)
TGFD Transient Ground Fault Detection Y Y
VTFF Voltage Transformer Fuse Failure Y Y
n/a Fast Underfrequency Y (1) Y (2)
n/a Underfrequency Restoration Y Y
n/a Undervoltage Restoration Y Y
n/a Load Encroachment Y (1) Y (2)
ANSI
Device
Description 850-E
Industrial
850-D
Distribution
850-P
Padmount

CHAPTER 1: INTRODUCTION DESCRIPTION OF THE 850 FEEDER PROTECTION SYSTEM
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–7
Table 1-2: Other 850 Device Functions
Description
Analog Input
Analog Output
Breaker Arcing Current (I2t)
Breaker Control
Breaker Health
CT Supervision
Current/Power Demand
Data Logger
Digital Counters
Event Recorder
Fault Report and Fault Locator
FlexElements
FlexLogic Equations
Flex States
Harmonic Detection
IEC 61850 Communications
Metering: current, voltage, power, PF, energy, frequency, harmonics, THD
Modbus User Map
Neutral Admittance
Non-volatile Latches
OPC-UA Communications
Output Relays
Pulsed Outputs
Setpoint Groups (6)
Trip Bus (6)
Transient Recorder (Oscillography)
Trip and Close Coil Monitoring
User-programmable LEDs
User-programmable Pushbuttons
Virtual Inputs (64)
Virtual Outputs (96)

1–8 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
DESCRIPTION OF THE 850 FEEDER PROTECTION SYSTEM CHAPTER 1: INTRODUCTION
Figure 1-4: Main Menu Hierarchy
Setpoints
Device
System
Inputs
Outputs
Protection
Monitoring
Control
FlexLogic
Status
Metering
Records
Events
Transients
Data Logger
Breakers
Dig Counters
Clear Records
Targets
Fault Reports
Testing
Output Relays
Virtual Inputs
Contact Inputs
Arc Flash
Virtual Outputs
Communications
Information
Device Status
PTP Status
Clock
Last Trip Data
Flex States
Summary
Breakers
Switches
Autoreclose
Summary
Currents
Voltages
Frequency
Harmonics
Synchrocheck
Power
Energy
Current Demand
Thermal Capacity
Power Demand
Directional Power
Wattmetric Gnd Flt
Fast Underfrequency
Arc Flash
Analog Inputs
RTD Maximums
Admittance
Harmonic Detection
Power Factor
RTDs
FlexElements
Remote Modbus Device

CHAPTER 1: INTRODUCTION SECURITY OVERVIEW
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–9
Security Overview
The following security features are available:
BASIC SECURITY
The basic security feature is present in the default offering of the 850 relay. The
850 introduces the notion of roles for different levels of authority. Roles are used as login
names with associated passwords stored on the device. The following roles are available
at present: Administrator, Operator, Factory and Observer, with a fixed permission
structure for each one. Note that the Factory role is not available for users, but strictly
used in the manufacturing process.
The 850 can still use the Setpoint access switch feature, but enabling the feature can be
done only by an Administrator. Setpoint access is controlled by a keyed switch to offer
some minimal notion of security.
CYBERSENTRY
The CyberSentry Embedded Security feature is a software option that provides advanced
security services. When the software option is purchased, the Basic Security is
automatically disabled.
CyberSentry provides security through the following features:
• An Authentication, Authorization, Accounting (AAA) Remote Authentication Dial-In
User Service (RADIUS) client that is centrally managed, enables user attribution, and
uses secure standards based strong cryptography for authentication and credential
protection.
• A Role-Based Access Control (RBAC) system that provides a permission model that
allows access to 850 device operations and configurations based on specific roles
and individual user accounts configured on the AAA server. At present the defined
roles are: Administrator, Operator and Observer.
• Strong encryption of all access and configuration network messages between the
EnerVista software and 850 devices using the Secure Shell (SSH) protocol, the
Advanced Encryption Standard (AES), and 128-bit keys in Galois Counter Mode (GCM)
as specified in the U.S. National Security Agency Suite B extension for SSH and
approved by the National Institute of Standards and Technology (NIST) FIPS-140-2
standards for cryptographic systems.
• Security event reporting through the Syslog protocol for supporting Security
Information Event Management (SIEM) systems for centralized cyber security
monitoring.
There are two types of authentication supported by CyberSentry that can be used to
access the 850 device:
• Device Authentication – in which case the authentication is performed on the
850 device itself, using the predefined roles as users (No RADIUS involvement).
– 850 authentication using local roles may be done either from the front panel or
through EnerVista.
• Server Authentication - in which case the authentication is done on a RADIUS server,
using individual user accounts defined on the server. When the user accounts are
created, they are assigned to one of the predefined roles recognized by the 850
– 850 authentication using RADIUS server may be done only through EnerVista.
FASTPATH: WiFi and USB do not currently support CyberSentry security. For this reason WiFi is
disabled by default if the CyberSentry option is purchased. WiFi can be enabled, but be
aware that doing so violates the security and compliance model that CyberSentry is
supposed to provide.

1–10 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SECURITY OVERVIEW CHAPTER 1: INTRODUCTION
When both 850 device and server authentication are enabled, the 850 automatically
directs authentication requests to the 850 device or the respective RADIUS server, based
on user names. If the user ID credential does not match one of the device local accounts,
the 850 automatically forwards the request to a RADIUS server when one is provided. If a
RADIUS server is provided, but is unreachable over the network, server authentication
requests are denied. In this situation, use local 850 device accounts to gain access to the
850 system.
USER ROLES
User Access Levels are used to grant varying permissions to specific user roles. User roles
are used by both Basic Security and CyberSentry.
The following user roles are supported:
•Administrator: The Administrator role has complete read and write access to all
settings and commands. The role does not allow concurrent access. The Administrator
role also has an operand to indicate when it is logged on.
•Operator: The Operator role is present to facilitate operational actions that may be
programmed and assigned to buttons on the front panel. The Operator has read/write
access to all settings under the command menu/section. The Operator can also use
the Virtual Input command under the control menu/section. The Operator can view
settings from EnerVista or the front panel but does not have the ability to change any
settings. This role is not a concurrent role.
•Observer: The Observer role has read-only access to all 850 settings. This role allows
concurrent access. The Observer is the default role if no authentication has been done
to the device. This role can download settings files and records from the device.
•Factory: This is an internal non-user accessible role used for manufacturing
diagnostics. The ability to enable or disable this role is a security setting that the
Administrator controls.
GENERAL RULES FOR USER ROLES WITH CYBERSENTRY
1. The only concurrent role is Observer. If the user is logged in through serial, front panel,
or over the network, that counts as the role being logged in for concurrency reasons.
2. Both EnerVista and the front panel provide a one-step logoff. For the front panel, the
root menu has a logoff command. From EnerVista right-clicking on a device and
providing a logoff function from the context menu is sufficient.
3. The EnerVista Login Screen has “User Name:” and “Password:” fields for the default
remote (Radius) authentication, but when a “Local Authentication” checkbox is
selected the “User Name:” field changes to a drop down menu where the user can
select one of the predefined roles on the 850.