Thytronic NC20 User manual

NC2 0 - Manual - 01 - 2 015
MANUAL
NC20
MULTIFUNCTION PROTECTION FOR
BANK CAPACITORS/HARMONIC FILTERS
WITH UNDER/OVERVOLTAGE ELEMENTS

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NC2 0 - Manual - 01 - 2 015
TABLE OF CONTENTS
TABLE OF CONTENTS
1 INTRODUCTION 5
Scope and liability...........................................................................................................................................................................................5
Applicability......................................................................................................................................................................................................5
Conformity ........................................................................................................................................................................................................5
Copyright...........................................................................................................................................................................................................5
Warranty...........................................................................................................................................................................................................5
Safety recommendations...............................................................................................................................................................................5
Insulation tests ................................................................................................................................................................................................5
Product identification .....................................................................................................................................................................................6
Environment .....................................................................................................................................................................................................6
Graphical conventions ...................................................................................................................................................................................6
Glossary/definitions ........................................................................................................................................................................................6
2 GENERAL 10
Preface........................................................................................................................................................................................................... 10
Photo .............................................................................................................................................................................................................. 10
Main features.................................................................................................................................................................................................11
3 TECHNICAL DATA 12
3.1 GENERAL............................................................................................................................................................................................................12
Product standard for measuring relays.....................................................................................................................................................12
Mechanical data ...........................................................................................................................................................................................12
Insulation ........................................................................................................................................................................................................12
Voltage dip and interruption........................................................................................................................................................................12
EMC tests for interference immunity.........................................................................................................................................................12
Emission......................................................................................................................................................................................................... 13
Mechanical tests.......................................................................................................................................................................................... 13
Climatic tests................................................................................................................................................................................................. 13
Safety ............................................................................................................................................................................................................. 13
Certifications................................................................................................................................................................................................. 13
3.2 INPUT CIRCUITS ...............................................................................................................................................................................................14
Auxiliary power supply Uaux ......................................................................................................................................................................14
Phase current input circuits........................................................................................................................................................................14
Unbalance neutral current input circuit....................................................................................................................................................14
Voltage input circuits....................................................................................................................................................................................14
Binary input circuits......................................................................................................................................................................................14
3.3 OUTPUT CIRCUITS............................................................................................................................................................................................14
Relays..............................................................................................................................................................................................................14
Block output (Logic selectivity)...................................................................................................................................................................14
3.4 MMI.....................................................................................................................................................................................................................15
3.5 COMMUNICATION INTERFACES ...................................................................................................................................................................15
Local port........................................................................................................................................................................................................15
Remote ports..................................................................................................................................................................................................15
3.6 GENERAL SETTINGS ........................................................................................................................................................................................16
3.7 PROTECTIVE FUNCTIONS ...............................................................................................................................................................................16
Base current - IB...........................................................................................................................................................................................16
Discharge time - TD......................................................................................................................................................................................16
Thermal protection with Pt100 probes - 26 ...............................................................................................................................................16
Undervoltage - 27..........................................................................................................................................................................................16
Undercurrent - 37..........................................................................................................................................................................................17
Phase unbalance - 46 ...................................................................................................................................................................................17
Neutral unbalance current - 46N................................................................................................................................................................17
Thermal image - 49....................................................................................................................................................................................... 18
RMS Phase overcurrent - 50/51................................................................................................................................................................. 19
Phase overcurrent - 50/51 Fundamental .................................................................................................................................................. 20
Residual overcurrent - 50N/51N ................................................................................................................................................................ 20
Overvoltage - 59.............................................................................................................................................................................................22
Breaker failure - BF.......................................................................................................................................................................................22
3.8 CONTROL AND MONITORING....................................................................................................................................................................... 23
Trip Circuit Supervision - 74TCS................................................................................................................................................................. 23
Selective block - BLOCK2 ........................................................................................................................................................................... 23
Circuit Breaker supervision........................................................................................................................................................................ 23
CT supervision - 74CT.................................................................................................................................................................................. 23
Pilot wire diagnostic .................................................................................................................................................................................... 23
Demand measures ....................................................................................................................................................................................... 23

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NC2 0 - Manual - 01 - 2 015
Oscillography (DFR) .................................................................................................................................................................................... 23
PLC (Programmable Logic Controller) ......................................................................................................................................................24
3.9 METERING..........................................................................................................................................................................................................24
Accuracy (type tests)....................................................................................................................................................................................24
Measures........................................................................................................................................................................................................24
4 FUNCTION CHARACTERISTICS 25
4.1 HARDWARE DESCRIPTION.............................................................................................................................................................................25
Power supply board......................................................................................................................................................................................26
CPU board.......................................................................................................................................................................................................26
Input board .....................................................................................................................................................................................................26
MMI (keyboard, LED and display) ..............................................................................................................................................................26
4.2 SOFTWARE DESCRIPTION ..............................................................................................................................................................................27
Base software................................................................................................................................................................................................27
Real-time operating system.........................................................................................................................................................................27
Task..................................................................................................................................................................................................................27
Drivers............................................................................................................................................................................................................ 28
Application Software................................................................................................................................................................................... 28
Data Base ...................................................................................................................................................................................................... 28
Self test (Application) .................................................................................................................................................................................. 28
Development tools (Builder)....................................................................................................................................................................... 28
4.3 I/O DESCRIPTION............................................................................................................................................................................................. 29
Metering inputs ............................................................................................................................................................................................ 29
Signal processing......................................................................................................................................................................................... 29
Conventions................................................................................................................................................................................................... 33
Use of measured values...............................................................................................................................................................................34
Binary inputs ..................................................................................................................................................................................................35
Output relays................................................................................................................................................................................................. 40
LED indicators................................................................................................................................................................................................42
Communication interfaces...........................................................................................................................................................................44
4.4 PROTECTIVE ELEMENTS .................................................................................................................................................................................45
Rated values...................................................................................................................................................................................................45
Thermal protection with RTD thermometric probes - 26 ....................................................................................................................... 48
Undervoltage - 27......................................................................................................................................................................................... 50
Undercurrent - 37..........................................................................................................................................................................................54
TD Discharge time.........................................................................................................................................................................................56
Phase unbalance current - 46.....................................................................................................................................................................57
Neutral unbalance current - 46N............................................................................................................................................................... 63
Thermal image - 49........................................................................................................................................................................................71
Phase overcurrent - 50/51 RMS..................................................................................................................................................................82
Phase overcurrent - 50/51 Fundamental .................................................................................................................................................. 89
Residual overcurrent - 50N/51N .................................................................................................................................................................96
Overvoltage - 59...........................................................................................................................................................................................106
Breaker failure - BF.................................................................................................................................................................................... 110
4.5 CONTROL AND MONITORING......................................................................................................................................................................112
Logical block - BLOCK1..............................................................................................................................................................................112
Selective block -BLOCK2 ...........................................................................................................................................................................114
Remote tripping .......................................................................................................................................................................................... 119
Frequency tracking .................................................................................................................................................................................... 120
Cold Load Pickup - CLP ..............................................................................................................................................................................121
CT supervision - 74CT.................................................................................................................................................................................122
Trip circuit supervision - 74TCS................................................................................................................................................................ 123
Circuit breaker supervision .......................................................................................................................................................................126
Demand measures ..................................................................................................................................................................................... 129
Oscillography ............................................................................................................................................................................................. 129
5 MEASURES, LOGIC STATES AND COUNTERS 130
Measures..................................................................................................................................................................................................... 130
Protection .................................................................................................................................................................................................... 130
Delayed inputs ............................................................................................................................................................................................ 130
Internal states............................................................................................................................................................................................. 130
Relays............................................................................................................................................................................................................131
Counters........................................................................................................................................................................................................131
Self test .........................................................................................................................................................................................................131
Pilot wire diagnostic ...................................................................................................................................................................................132
Selective Block - BLOCK2..........................................................................................................................................................................132
Fault recording - SFR..................................................................................................................................................................................132
Event recording - SER................................................................................................................................................................................ 133
Oscillography - DFR ................................................................................................................................................................................... 133

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NC2 0 - Manual - 01 - 2 015
6 INSTALLATION 135
6.1 PACKAGING.....................................................................................................................................................................................................135
6.2 MOUNTING......................................................................................................................................................................................................135
6.3 ELECTRICAL CONNECTIONS ....................................................................................................................................................................... 139
6.4 NOMINAL CURRENT InAND IEn SETTING ................................................................................................................................................146
6.5 LED ALLOCATION........................................................................................................................................................................................... 150
6.6 FINAL OPERATIONS ...................................................................................................................................................................................... 150
7 PROGRAMMING AND SETTINGS 151
7.1 SW ThySetter...................................................................................................................................................................................................151
ThySetter installation..................................................................................................................................................................................151
ThySetter use ...............................................................................................................................................................................................151
7.2 MMI (Man Machine Interface) ....................................................................................................................................................................152
Reading variables (READ)..........................................................................................................................................................................152
Setting modifying (SET) ............................................................................................................................................................................. 153
TEST...............................................................................................................................................................................................................154
COMMUNICATION......................................................................................................................................................................................154
Circuit breaker commands ........................................................................................................................................................................154
Enable / block changes via keyboard - Password.................................................................................................................................155
7.3 MENU TREE......................................................................................................................................................................................................157
7.4 MODULES MANAGEMENT ...........................................................................................................................................................................164
7.5 MAINTENANCE...............................................................................................................................................................................................164
7.6 REPAIR..............................................................................................................................................................................................................164
7.7 PACKAGING.....................................................................................................................................................................................................164
8 APPENDIX 165
8.1 APPENDIX A1 - Inverse time IEC curves ...................................................................................................................................................165
Mathematical formula................................................................................................................................................................................165
Neutral unbalance current 46N - Standard inverse time curve (IEC 60255-3/BS142 type A)........................................................166
Neutral unbalance current 46N - Very inverse time curve (IEC 60255-3/BS142 type B) ................................................................167
Neutral unbalance current 46N -Extremely inverse time curve (IEC 60255-3/BS142 type C)....................................................... 168
Phase overcurrent 50/51 RMS - Standard inverse time curve (IEC 60255-3/BS142 type A)......................................................... 169
Phase overcurrent 50/51 RMS - Very inverse time curve (IEC 60255-3/BS142 type B) ................................................................. 170
Phase overcurrent 50/51 RMS - Extremely inverse time curve (IEC 60255-3/BS142 type C).........................................................171
Residual overcurrent 50N/51N - Standard inverse time curve (IEC 60255-3/BS142 type A) .........................................................172
Residual overcurrent 50N/51N - Very inverse time curve (IEC 60255-3/BS142 type B)................................................................. 173
Residual overcurrent 50N/51N - Extremely inverse time curve (IEC 60255-3/BS142 type C) ........................................................174
8.2 APPENDIX A2 - Inverse time ANSI/IEEE curves .......................................................................................................................................175
Mathematical formula................................................................................................................................................................................175
Neutral unbalance current 46N - Moderately inverse time curve (ANSI/IEEE type MI)................................................................176
Neutral unbalance current 46N - Very inverse time curve (ANSI/IEEE type VI) .............................................................................177
Neutral unbalance current 46N - Extremely inverse time curve (ANSI/IEEE type EI)................................................................... 178
Phase overcurrent 50/51 RMS - Moderately inverse time curve (ANSI/IEEE type MI)................................................................. 179
Phase overcurrent 50/51 RMS - Very inverse time curve (ANSI/IEEE type VI)............................................................................... 180
Phase overcurrent 50/51 RMS - Extremely inverse time curve (ANSI/IEEE type EI) ......................................................................181
Residual overcurrent 50N/51N - Moderately inverse time curve (ANSI/IEEE type MI) .................................................................182
Residual overcurrent 50N/51N - Very inverse time curve (ANSI/IEEE type VI) .............................................................................. 183
Residual overcurrent 50N/51N - Extremely inverse time curve (ANSI/IEEE type EI)......................................................................184
8.4 APPENDIX B1 - I/O Diagram .........................................................................................................................................................................185
8.5 APPENDIX B2 - Interfaces ............................................................................................................................................................................186
8.6 APPENDIX B3- Connection diagrams .........................................................................................................................................................187
8.7 APPENDIX C - Dimensions........................................................................................................................................................................... 189
8.8 APPENDIX D - Setting table......................................................................................................................................................................... 190
8.8 APPENDIX E - Revisions history...................................................................................................................................................................226
8.9 APPENDIX F - EC Declaration of conformity..............................................................................................................................................227

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NC2 0 - Manual - 01 - 2 015
PREFACE
1 INTRODUCTION
1 INTRODUCTION
Scope and liability
This document describes the functions, the technical data of NC20 devices; instructions for mount-
ing, setting and commissioning are included.
This manual has been checked out, however, deviations from the description cannot be completely
ruled out, so that no liability in a legal sense for correctness and completeness of the information or
from any damage that might result from its use is formally disclaimed.
The information given in this document is reviewed regularly; any corrections and integration will be
included in subsequent editions that are identified by the date of revision.
We appreciate any suggestions for improvement.
We reserve the right to make technical improvements without notice.
Applicability
This manual is valid for NC20 devices with firmware version 1.61 and following.
Conformity
The product complies with the CEE directives:
EMC Council Directives: 89/336/EEC
Low voltage Directives: 73/23/EEC
Copyright
All right reserved; It is forbidden to copy, modify or store material (document and sw) protected by
copyright without Thytronic consent.
Warranty
Thytronic warrants devices against defects in materials and workmanship under normal use for a
period of ONE (1) YEAR from the date of retail purchase by the original end-user purchaser (“War-
ranty Period”).
Safety recommendations
The warming contained in this document are all-important for safety; special attention must be paid
to the following symbols:
Installation and commissioning must be carried out by qualified person; Thytronic assumes no re-
sponsibility for damages caused from improper use that does not comply all warning and caution in
this manual.
In particular the following requirements must be met:
Remove power before opening it.
Verify the voltage absence by means suitable instrumentation on relay connections; attention must
be paid to all circuits supplied by external sources (binary input, CT, etc...)
Care must be taken when handling metal parts (front panel, connectors).
Insulation tests
After insulation tests, hazardous voltages (capacitor charges,...) may be arise; it is advisable to grad-
ually reduce the test voltage avoiding to erase it abruptly.
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DANGER Death, severe personal injury or substantial property damage will result if proper precautions
are not taken
DANGER Death, severe personal injury or substantial property damage will result if proper precautions
are not taken
WARNING Death, severe personal injury or substantial property damage can result if proper precautions
are not taken.
WARNING Death, severe personal injury or substantial property damage can result if proper precautions
are not taken.
CAUTION Minor personal injury or property damage can result if proper precautions are not taken CAUTION Minor personal injury or property damage can result if proper precautions are not taken
CAUTION
Settings must be established on the basis of a coordination study.
Numerical values inside examples have educational purpose only; they don’t be used, in no way,
for actual applications.
CAUTION
Settings must be established on the basis of a coordination study.
Numerical values inside examples have educational purpose only; they don’t be used, in no way,
for actual applications.

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6NC2 0 - Manual - 01 - 2 015 PREFACE
Product identification
Each device is equipped with:
Identification label installed on the front side with following informations: code number, phase and
residual nominal currents, auxiliary voltage range and CE mark:
Test label with following informations: data, serial number and test operator signature.
Environment
The NC20 device must be employed according to the environment conditions shown (see technical
data).
In case of different environment conditions, appropriate provisions must be provided (conditioning
system, humidity control, etc...).
If contaminants are present (dust, corrosive substances, etc...), filters must be provided.
Graphical conventions
The CEI/IEC and ANSI symbols is employed where possible:
e.g.: 51 = ANSI code concerning the overcurrent element.
Following text formats are used:
The ThySetter[1] menu:
Phase overcurrent -50/51
The parameter description (measures, thresholds, operate time,...) and related value:
I> element
Definite time
I>def
The display messages (MMI) are shown as:
NC20
Notes are highlighted with cursive letters inside colored bar
Note: Useful description note
Glossary/definitions
I
En Relay residual nominal current
I
Enp Residual CT primary nominal current
I
nRelay phase nominal current
I
np Phase CT primary nominal current
INn Relay unbalance nominal current
INnp
Unbalance CT nominal primary current
27 Undervoltage ANSI code
46 Phase unbalance overcurrent ANSI code
46N Neutral unbalance overcurrent with inherent unbalance compensa-
tion ANSI code
49 Thermal image (for series reactor) ANSI code
50/51 Fundamental phase overcurrent ANSI code
50/51 RMS RMS phase overcurrent ANSI code
50N/51N Computed residual overcurrent ANSI code
59 Overvoltage ANSI code
TD Discharge Timer
BF Circuit breaker failure ANSI code
74CT CT supervision ANSI code
74TCS Trip Circuit Supervision ANSI code
DFR Digital Fault Recorder (Oscillography)
SER Sequential Event Recorder
SFR Sequential Fault Recorder
ANSI American National Standard Institute
IEEE Institute of Electrical and Electronics Engineers
IEC International Electrotechnical Commission
CENELEC Comité Européen de Normalisation Electrotechnique
Note 1 The graphic interface and the operation of the ThySetter software are described in the relative chapters
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NC20#JA2MMB0
In
UAUX 110-230 Vac/dc
100V
5A
IEn
INn
Un 1A 1A
5A 1A 5A 5A 1A
5A
1
2
3
4
5NC20#JA2MMB0
In
UAUX 110-230 Vac/dc
100V
5A
IEn
INn
Un 1A 1A
5A 1A 5A 5A 1A
5A
1
2
3
4
5

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NC2 0 - Manual - 01 - 2 015
PREFACE
52 o CB (Circuit Breaker) Circuit Breaker
52a Auxiliary contact in the breaker that is in the same position as the
breaker. It can be assigned to a binary input to locate the CB posi-
tion (Breaker failure and/or CB diagnostic functions). (52a open = CB
open)
52b Auxiliary contact in the breaker that is in the opposite position as the
breaker (52b open = CB closed)
K1...K6...K10 Output relays
Pulse Output relay with pulse operation
tTR Output relay minimum pulse width
Latched Output relay with latched operation (manual reset) Output relay with
latched operation (automatic reset)
No-latched Output relay with no-latched operation (automatic reset)
CT Current Transformer
P1 IEC nomenclature for primary polarity mark of CTs (as an alternative to
a ANSI dot)
P2 IEC nomenclature for primary polarity mark of CTs (as an alternative to
a ANSI no-dot)
S1 IEC nomenclature for secondary polarity mark of CTs (as an alternative
to a ANSI dot)
S2 IEC nomenclature for secondary polarity mark of CTs (as an alternative
to a ANSI no-dot)
Self test Diagnostic
Start Leave an initial condition or reset condition (Pickup)
Trip Operation (with operate time)
Operating time Duration of time interval between the instant when the character-
istic quantity in reset condition is changed, under specified condi-
tions, and the instant when the relay operates
Dropout ratio The ratio of a reset value to an operate value in well-specified con-
ditions. The dropout ratio may be lower or greater than 1 according
as an over or under element is considered
Reset time Duration of the time interval between the instant when the charac-
teristic quantity in operate condition is changed, under specified
conditions, and the instant when the relay operates.
The stated reset time is related to a step variation of characteristic
quantity in operate condition to the reset condition.
Overshoot time The critical impulse time for a relay which is in its reset condition,
is the longest duration a specified change in the input energizing
quantity(ies) (characteristic quantity), which will cause the relay
to change to operate condition, can be applied without the relay
switches. The overshoot time is the difference from the operate time
and the critical impulse time.
The declared values for the overshoot time are applicable with the
lower setting value of the operation time.
MMI (Man Machine Interface) Operator front panel
ThySetter Setting and monitoring software
Log file A text file that lists actions that have occurred (ThySetter).
J2SE Java Platform Standard Edition
Subnet Mask (Ethernet nomenclature)
Sw Software
Fw Firmware
Upgrade Firmware upgrade
XML eXtensible Markup Language

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8NC2 0 - Manual - 01 - 2 015 PREFACE
Symbols.ai
Symbols
I>> Start
I>> BF_OUT
IPh Block2
Logic internal signal (output); may be a logical state (e.g.I>> Start ) or a numerical value
It is available for reading (ThySetter + communication interface)
Logic external signal (intput); may be a command coming from a binary input or a sw command
It is available for reading (ThySetter + communication interface)
Internal signal (e.g. Breaker Failure output state concerning to the 2nd threshold of the 50 element)
It is not available for reading (missing arrow)
AND and NAND logic gates
OR and NOR logic gates
Limit block (I>> threshold).
Computation block (Max phase current)
Threshold setting (e.g. pickup
I>>) .
The value is available for reading and is adjustable by means ThySetter + MMI.
Switch
ON delay timer with reset (tON delay)
ON delay timer without reset (tON delay)
OFF delay timer (dropout) without reset (tOFF delay)
Curve type (definite/inverse time)
0T
IL3
Max[IL1 ,IL2 ,IL3 ]
IL2
IL1
tON tON tON tON
t
RESET
INPUT
OUTPUT
tOFF
t
tOFF
INPUT
OUTPUT
tON tON tON
t
INPUT
OUTPUT
0T
tON
& &
≥1≥1
EXOR logic gate
tOFF
=1
I>>
II ≥
I>>
tON
RESET
0T
0T

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NC2 0 - Manual - 01 - 2 015
PREFACE
Symbols1 .ai
t
RESET
INPUT
OUTPUT
tOFF
tOFF
tOFF tOFF
Minimum pulse width operation for output relays (tTR )
tTR
t
tTR
INPUT
OUTPUT
tTR
0T
tTR
t
tTR
INPUT
OUTPUT
Latched operating mode for output relays and LEDs
Pulse operating mode for output relays
t
INPUT
OUTPUT
Latched
tTR
T0
RESET
OFF delay timer (dropout) with reset (tOFF delay)

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10 GENERAL
NC2 0 - Manual - 01 - 2 015
2 GENERAL
2 GENERAL
Preface
The relay type NC20 provides protection of shunt capacitor banks and harmonic filter circuits.
The capacitor banks may have the following configurations:
Single Wye grounded.
Single Wye ungrounded (with a resistor on the output of the neutral unbalance voltage transformer
in order to develop the appropriate input current for the unbalance protection).
Double Wye ungrounded.
The capacitor banks may be: internally/externally fused or fuseless capacitor units.
A suitable compensation method is provided to compensate the inherent unbalance neutral cur-
rent.
Following input circuits are available:
Three phase current and one neutral unbalanced current inputs with nominal currents indepen-
dently selectable at 1 A or 5 A using dip-switch.
Three phase voltages (line-to-ground) with nominal voltages programmable in the range 50...130 V
(UR=100V) .
Two binary inputs.
One block input (logic selectivity).
In addition to the main protection element, the breaker failure (BF), CT monitoring (74CT), Trip Circuit
Supervision (TCS) and Programmable Logic controller (PLC) are also provided.
Setting, programming and reading operations must be effected by means of Personal Computer with
ThySetter software or by means of remote communication interface (RS485 bus and Ethernet net-
work); all operations must be performed through MMI.
According to the hardware configurations, the NC20 protection relay can be shipped in various case
styles depending on the required mounting options:
Flush.
Projecting mounting.
Rack.
With separate operator panel.
Other options are:
Auxiliary power supply operating range.
Communication protocols.
Photo
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NC2 0 - Manual - 01 - 2 015
GENERAL
Main features
Metallic case.
Backlight LCD 4x16 Display.
Eight LEDs that may be joined with matrix criteria to many and various functions.
RESET key to clear LED indications and latched output relays.
Two free settable binary inputs.
Independently settable for start, trip, self-test and control six output relay (K1...K6) Each output
relay may be set with normally energized or normally de-energized operating mode and manual or
automatic reset (latched/no-latched).
Rear Ethernet communication port, with MODBUS TCP/IP® protocol, with RJ45 (copper wires) or
FX (optical fiber) connection.
Rear RS485 port, with ModBus protocol.
RS232 front serial port (local communication for Thysetter).
Real time clock with super capacitor.
The most significant constructive features are:
Galvanically insulated input and output circuits (communication and binary circuits included).
Optimum filtering of input signals through combined use of analog and digital filters.
Traditional electromechanical-type final output contacts with continuous monitoring of control coil
continuity.
Auxiliary supply comprising a switching-type voltage stabilizing circuit having a very wide working
range and a very small power dissipation
Nominal frequency: 50 or 60 Hz.
The most significant operating features are:
Programming of operating modes and parameters by means of the front keys and alphanumeric
display, with a programming procedure based on carrying out guided selections and on explicit and
immediate signalling of the operations being performed, so that such procedure can be carried out
without coding tables or mnemonic informations.
The feature modification operations do not interrupt the normal functions of the relay.
Impossibility of programming unacceptable parameter values, thanks to the automatic limitation of
top and bottom scale values for the relative setting ranges.
Currents are sampled 24 times per period and measured in the effective value (RMS) of the funda-
mental component using the DFT (Discrete Fourier Transform) algorithm and digital filters.
The fault recorder (SFR) runs continuously capturing in circular mode the last twenty events upon
trigger of binary input/output and/or element pickup (start-trip).
The event recorder (SER) runs continuously capturing in circular mode the last three hundred
events upon trigger of binary input/output.
Digital fault recorder (DFR) in COMTRADE format (oscillography).
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12 NC2 0 - Manual - 01 - 2 015 TECHNICAL DATA
3 T E C H N I C A L D A T A
3 TECHNICAL DATA
3.1 GENERAL
Product standard for measuring relays
Reference standards IEC 60255-1 Part 1: Common requirements
Mechanical data
Mounting:
Flush.
Projecting.
Rack.
Separated operator panel.
External dimensions (Flush mounting) 177 x 107 x 235 (high x width x depth)
Terminals screw connection
Mass (Flush mounting) 2.0 kg
Reference standards EN 60529, EN 60529/A1
Degrees of protection provided by enclosures (IP Code)
Front IP52
• Terminals IP20
Insulation
Reference standards EN 60255-5, IEC 60255-27
High voltage test (50 Hz - 60 s)
Auxiliary power supply 2 kV
Input circuits 2 kV
Output circuits 2 kV
Output circuits (between open contacts) 1 kV
Impulse voltage withstand test (1.2/50 μs):
Auxiliary power supply 5 kV (Common mode) - 2kV (Differential mode)
Input circuits 5 kV
Output circuits 5 kV
Output circuits (between open contacts) 1 kV
Insulation resistance >100 MΩ
Voltage dip and interruption
Reference standards EN 61000-4-29, IEC 60255-22-11
Voltage dips, short interruptions and voltage variations on dc input power port immunity tests
Interruption (UT=40%) 100 ms
Interruption (UT=0%) 50 ms
• Voltage variations (UT=80...120%) 10 s
EMC tests for interference immunity
Reference standards IEC 60255-26, EN 60255-26
Product standard for measuring relays
Generic standards immunity for industrial environments EN 61000-6-2
Electromagnetic compatibility requirements for measuring relays and protection equipment
Apparati di automazione e controllo per centrali e stazioni elettriche
Compatibilità elettromagnetica - Immunità ENEL REMC 02
• Normativa di compatibilità elettromeccanica per apparati e sistemi
ENEL REMC 01
Reference standards EN 60255-22-1 IEC 60255-22-1
EN 61000-4-12 EN 61000-4-12
Damped oscillatory wave
0.1 MHz and 1 MHz common mode 2.5 kV
0.1 MHz and 1 MHz differential mode 1.0 kV
Ring wave common mode 2.0 kV
Ring wave differential mode 1.0 kV
Reference standards EN 60255-22-2 IEC 60255-22-2
EN 61000-4-2 IEC 61000-4-2
Electrostatic discharge
Contact discharge 6 kV
Air discharge 8 kV
Reference standards EN 60255-22-3 IEC 60255-22-3
EN 61000-4-3 IEC 61000-4-3
Radiated radio-frequency fields
80...1000 MHz AM 80% 10 V/m
900 MHz Pulse modulated 10 V/m
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NC2 0 - Manual - 01 - 2 015
TECHNICAL DATA
Reference standards EN 60255-22-4 IEC 60255-22-4
EN 61000-4-4 IEC 61000-4-4
Fast transient burst (5/50 ns)
Auxiliary power supply 2 kV
Input circuits 4 kV
Reference standards EN 60255-22-5 IEC 60255-22-5
EN 61000-4-5 IEC 61000-4-5
High energy pulse
Uaux (line-to-ground 10 ohm, 9 μF) 2 kV
Uaux (line-to-line 0 ohm, 18 μF) 1 kV
I/O ports (line-to-ground 40 ohm, 0.5 μF) 2 kV
I/O ports (line-to-line 40 ohm, 0.5 μF) 1 kV
Reference standards EN 60255-22-6 IEC 60255-22-6
EN 61000-4-6 IEC 61000-4-6
Conducted radio-frequency fields
0.15...80 MHz AM 80% 1kHz 10 V
Reference standards EN 60255-22-7 IEC 60255-22-7
EN 61000-4-16 IEC 61000-4-16
Power frequency immunity tests
Dc voltage 30 V
50 Hz continuously 30 V
50 Hz 1 s 300 V
0.015...150 kHz 30 V
Reference standards EN 61000-4-8 IEC 61000-4-8
Magnetic field 50 Hz
50 Hz continuously 100 A/m
50 Hz 1 s 1 kA/m
Reference standards EN 61000-4-10 IEC 61000-4-10
Damped oscillatory magnetic field
Damped oscillatory wave 0.1 MHz 30 A/m
• Damped oscillatory wave 1 MHz 30 A/m
Emission
Reference standards EN 60255-25 IEC 60255-25
EN 61000-6-4 IEC 61000-6-4
EN 55011 CISPR 11
Electromagnetic emission tests
Conducted emission auxiliary power supply 0.15...0.5 MHz 79 dB μV
Conducted emission auxiliary power supply 0.5...30 MHz 73 dB μV
Radiated emission 30...230 MHz 40 dB μV/m
• Radiated emission 230...1000 MHz 47 dB μV/m
Mechanical tests
Reference standards EN 60255-21-1 EN 60255-21-2 RMEC01
Vibration, shock, bump and seismic tests on measuring relays and protection equipment
EN 60255-21-1 Vibration tests (sinusoidal) Class 1
• EN 60255-21-2 Shock and bump test Class 1
Climatic tests
Reference standards IEC 60068-x ENEL R CLI 01 CEI 50
Environmental testing
Ambient temperature -25...+70 °C
Storage temperature -40...+85 °C
Relative humidity 10...95 %
Atmospheric pressure 70...110 kPa
Safety
Reference standards IEC 60255-27
Safety requirements for electrical equipment for measurement, control and laboratory use
Pollution degree 3
Reference voltage 250 V
Overvoltage category III
Certifications
Reference standards
Product standard for measuring relays EN 50263
CE Conformity
EMC Directive 2004/108/EC
Low Voltage Directive 2006/95/CE
Type tests IEC 60255-1
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14 NC2 0 - Manual - 01 - 2 015 TECHNICAL DATA
3.2 INPUT CIRCUITS
Auxiliary power supply Uaux
Voltage
Nominal value (range) 24...48 V~/-
115...230 V~/110...220 V-
Operative range (each one of the above nominal values) 19...60 V~/-
85...265 V~/75...300 V-
Inrush current (max)
24 V- 6 A, 5 ms
48 V- 14 A, 5 ms
110 V- 20 A, 1 ms
230 V~ 50 A, 1 ms
Frequency (for alternate voltage supply) 45...66 Hz
Max distortion factor ( for alternating voltage supply) 15%
Max alternating component (for dc voltage supply):
Full wave rectified sine wave 100 %
Sine wave 80 %
Power consumption:
Maximum (energized relays, Ethernet TX) 10 W (20 VA)
• Maximum (energized relays, Ethernet FX) 15 W (25 VA)
Phase current input circuits
Relay nominal phase current In1 A or 5 A selectable by dip-switch
Permanent overload 25 A
Thermal overload (1 s) 500 A
Dynamic overload (half cycle) 1250 A
Rated consumption (for any phase) ≤0.002 VA with In=1 A
≤0.04 VA with In=5 A
Unbalance neutral current input circuit
Relay nominal unbalance nominal current INn 1 A or 5 A selectable by dip-switch
Permanent overload 25 A
Thermal overload (1 s) 500 A
Dynamic overload (half cycle) 1250 A
Rated consumption ≤0.006 VA with IEn=1 A
≤0.12 VA with IEn=5 A
Voltage input circuits
Relay nominal voltage Un50...130 V (UR= 100 V)
Permanent overload 1.3 UR
Thermal overload (1 s) 2 UR
Rated consumption (for any phase) ≤ 0.5 VA
Binary input circuits
Quantity 2
Type optocoupler
Operative range 24...265 V~/-
Min activation voltage UDIGmin 18 V
Max consumption, energized IDIG 3 mA
3.3 OUTPUT CIRCUITS
Relays
Quantity 6
Type of contacts K1, K2 changeover (SPDT, type C)
Type of contacts K3, K4, K5 make (SPST-NO, type A)
Type of contacts K6 break (SPST-NC, type B)
Nominal current 8 A
Nominal voltage/max switching voltage 250 V~/400 V~
Breaking capacity:
Direct current (L/R = 40 ms) 50 W
Alternating current (λ= 0,4) 1250 VA
Make 1000 W/VA
Short duration current (0,5 s) 30 A
Minimum switching load 300 mW (5 V/ 5 mA)
Life:
Mechanical 106operations
Electrical 105operations
Block output (Logic selectivity)
Quantity 1
Type optocoupler
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NC2 0 - Manual - 01 - 2 015
TECHNICAL DATA
3.4 MMI
Display LCD alfanumerico 16x4
LEDs
Quantity 8
ON/fail (green) 1
Start (yellow) 1
Trip (red) 1
Freely allocatable (red) 5
Keyboard 8 keys
3.5 COMMUNICATION INTERFACES
Local port
Connection RJ10
Baud rate 19200 bps
Parity None
Protocol Modbus RTU®
Remote ports
RS485
Connection screw terminals
Baud rate 1200...57600 bps
Protocol ModBus®RTU
IEC 60870-5-103
DNP3
Ethernet 100BaseT
Connection Optical fiber 1300 nm, ST
100 Base TX, RJ45
Baud rate 100 Mbps
Protocol ModBus®TCP/IP,
IEC61850 - Level A
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16 NC2 0 - Manual - 01 - 2 015 TECHNICAL DATA
3.6 GENERAL SETTINGS
Relay nominal frequency (fn) 50, 60 Hz
Relay phase nominal current (In) 1 A or 5 A [1]
Phase CT primary nominal current (Inp) 1 A...10 kA
1...499 A (step 1 A)
500...4990 A (step 10 A)
5000...10000 A (step 100 A)
Relay unbalance neutral nominal current (INn) 1 A o 5 A [1]
Unbalance neutral CT primary nominal current (INnp) 1 A...10 kA
1...499 A (step 1 A)
500...4990 A (step 10 A)
5000...10000 A (step 100 A)
Relay nominal voltage (Un) 50...130 V (step 1 V)
Line VT primary nominal voltage (Unp) 50 V...500 kV
50...499 V (step 1 V)
500...4990 V (step 10 V)
5000...49900 V (step 100 V)
50000...500000 V (step 1000 V)
3.7 PROTECTIVE FUNCTIONS
Base current - IB
Base current (IB) 0.10...2.50 In (step 0.01 In)
Discharge time - TD
tD Discharge operating time (tD) 0.1...100.0 min (step 0.1 min)
Thermal protection with Pt100 probes - 26[2]
ThAL1...8 Alarm:
Alarm threshold 26 PT1...PT8 (ThAL1...8) 0...200 °C
Operating time ThAL1...8 (tThAL1...8) 0....100 s
Th>1...8 Trip:
Trip threshold 26 PT1...PT8 (Th>1...8) 0...200 °C
Operating time ThAL1...8 (tTh>1...8) 0....100 s
Undervoltage - 27
Common configuration:
27 Operating logic (Logic27) AND/OR
U< Element
U< Curve type (U<Curve) DEFINITE/INVERSE[3]
Definite time
27 First threshold definite time (
U <def) 0.05...1.10 Un (step 0.01 Un)
U<def Operating time (tU<def) 0.03...100.0 s
0.03...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Inverse time
27 First threshold inverse time (
U <inv) 0.05...1.10 Un (step 0.01 Un)
U<inv Operating time (tU<inv) 0.10...100.0 s
0.10...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
U<<Element
Definite time
27 Second threshold definite time (
U <<def) 0.05...1.10 Un (step 0.01 Un)
U<<def Operating time (tU<<def) 0.03...100.0 s
0.03...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time ≤ 0.03 s
Dropout ratio 1.03...1.05
Dropout time ≤ 0.05 s
Overshoot time 0.03 s
Pickup accuracy ± 0.3% with 0.1Un/En,±0.1% with 1Un/En
Operate time accuracy 5% or ± 10 ms
Note 1 The nominal current settings doesn’t concern the protection elements; they must agree with hardware setting (dip-switch 1 A or 5 A) .
Note 2 The 26 element is available when the MPT module is connect on Thybus and enabled
Note 3 The mathematical formula for INVERSE curve is: t= 0.75 ∙ tU<inv / [1 - (U/U<inv)]
t = operating time (in seconds)
t
U<inv = operatie time setting (in seconds)
U = input voltage
U<inv = threshold setting
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NC2 0 - Manual - 01 - 2 015
TECHNICAL DATA
Undercurrent - 37[1]
I< Element
I<def Operating logic OR[2]
Definite time
37 First threshold definite time (
I <def) 0.05...1.00 In
I<def Operating time (tI<def) 0.04...200.0 s
0.04...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
I<< Element
I<<def Operating logic AND[3]
Definite time
37 Second threshold definite time (
I <<def) 0.05...1.00 Un
U<<def Operating time (tI<<def) 0.04...200.0 s
0.04...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
Pickup time ≤ 0.04 s
Dropout ratio 1.03...1.05
Dropout time ≤ 0.05 s
Overshoot time 0.04 s
Pickup accuracy ± 0.5% with 0.1In,
±0.2% with 1In
Operate time accuracy 5% or ± 10 ms
Phase unbalance - 46
I2>Element
I2CLP> Activation time (t2CLP>) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I2> Reset time delay (t2>RES)0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
46 First threshold definite time (I2>def) 1...150 % (step 1 %)
I2>def within CLP (I2CLP>def) 1...150 %(step 1 %)
I2>def Operating time (t2>def) 0.05...60.0 s
0.05...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
I2>> Element
I2CLP>> Activation time (t2CLP>>) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I2>> Reset time delay (t2>>RES)0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
46 Second threshold definite time (I2>>def) 1...150 % (step 1 %)
I2>>def within CLP (I2CLP>>def) 1...150 % (step 1 %)
I2>>def Operating time (t2>>def) 0.05...60.0 s
0.05...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.04 s
Pickup accuracy ± 1% with I2≥ 0.5 In
Operate time accuracy 5% or ± 10 ms
Neutral unbalance current - 46N[4]
Common configuration:[5]
Compensation current (IC) 0.01...0.50 I
Nn (step 0.01
I
Nn)
Compensation angle (φC) 0...359° (step 1°)
Automatic compensation enable (ACE) ON/OFF
Note 1 The 37 protection is based on RMS value measurement of three phase currents (the computed RMS value takes into account the contribution
of fundamental and harmonic up to eleventh order.)
Note 2 Starting of I <def threshold takes place when at least one phase currents is undershot.
Note 3 Starting of I <<def threshold takes place when all three phase currents are undershot.
Note 4 The 46N protection is based on INC neutral compensated current INC = IN- IC(IN= RMS value of fundamental component for neutral current,
IC= compensation setting for neutral current).
Note 5 Setting of the compensation parameters are available inside the Set\46N Compensation menu, common for the A and B profiles
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18 NC2 0 - Manual - 01 - 2 015 TECHNICAL DATA
IN>AL Element
INCLP>AL Activation time (tNCL>PAL) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
46N Alarm threshold definite time (IN>ALdef) 0.01...1.00
I
Nn (step 0.01
I
Nn)
IN>ALdef within CLP (INCLP>ALdef) 0.01...1.00
I
Nn (step 0.01
I
Nn)
IN>ALdef Operating time (tN>ALdef) 0.03...500 s
0.03...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...500 s (step 1 s)
IN> Element
IN> Curve type (IN>Curve) DEFINITE, IEC/BS A, B, C,
ANSI/IEEE MI, VI, EI
INCLP>Activation time (tNCLP>) 0.00...100.0 s (step 0.01 s)
Definite time
46N First threshold definite time (IN>def) 0.01...2.00
I
Nn (step 0.01
I
Nn)
IN>def within CLP (INCLP>def) 0.01...2.00
I
Nn (step 0.01
I
Nn)
IN>def Operating time (tN>def) 0.03...50.0 s
0.03...9.99 s (step 0.01 s)
10.0...50.0 s (step 0.1 s)
Inverse time[1]
46N First threshold inverse time (IN>inv) 0.01...1.00 I
Nn (step 0.01
I
Nn)
IN>inv within CLP (INCLP>inv) 0.01...1.00
I
Nn (step 0.01
I
Nn)
IN>inv Operating time (tN>inv) 0.02...60.0 s
0.02...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
IN>> Element
INCLP>> Activation time (tNCLP>>) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
46N Second threshold definite time (IN>>def)0.01...2.00
I
Nn (step 0.01
I
Nn)
IN>>def within CLP (INCLP>>def) 0.01...2.00
I
Nn (step 0.01
I
Nn)
IN>>def Operating time (tN>>def) 0.03...50.0 s
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.04 s
Pickup accuracy ± 1% with 0.1 INn,±1% with 1 INn
Operate time accuracy 5% or ± 10 ms
Thermal image - 49[2]
Common configuration:
Initial thermal image
Δ θIN (DthIN) 0.0...1.0 Δ θB(step 0.1 Δ θB)
Reduction factor at inrush (KINR) 1.0...3.0 (step 0.1)
Thermal time constant τ (T) 1...200 min (step 1 min)
DthCLP activation time (tdthCLP) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
DthAL1 Element
49 First alarm threshold (DthAL1) 0.3...1.0
Δ θB(step 0.1 Δ θB)
DthAL2 Element
49 Second alarm threshold (DthAL2) 0.5...1.2
Δ θB(step 0.1 Δ θB)
Dth> Element
49 Trip threshold (Dth>) 1.100...1.300
Δ θB (step 0.001 Δ θB)
Pickup accuracy ± 1% with 0.1 In,±1% with 1 In
Operate time accuracy 5% or ± 10 ms
Note 1 Standard Inverse Time (IEC 255-3/BS142 type A or SIT): t = 0.14 · tN>inv / [(INC/IN>inv)0.02 - 1]
Very Inverse Time (IEC 255-3/BS142 type B or VIT): t = 13.5 · tN>inv / [(INC/IN>inv) - 1]
Extremely Inverse Time (IEC 255-3/BS142 type C or EIT): t = 80 · tN>inv / [(INC/IN>inv)2 - 1]
Moderately Inverse (ANSI/IEEE type MI): t = tN>inv · {0.01 / [(INC/IN>inv)0.02 - 1] + 0.023}
Very Inverse (ANSI/IEEE type VI): t = tN>inv · {3.922 / [(INC/IN>inv)2- 1] + 0.098}
Extremely Inverse (ANSI/IEEE type EI): t = tN>inv · {5.64 / [(INC/IN>inv)2- 1] + 0.024}
I
NC: Neutral compensated current (see note 2)
t:operate time
I
N>inv:threshold setting
t
N>inv:operate time setting
Asymptotic reference value: 1.1 IN>inv
Minimum operate time: 0.1 s
Equation is valid for 1.1 ≤ INC/IN>inv ≤ 20, with IN>inv pickup ≥ 0.15 INn, the upper limit is 3 INn
Note 2 The equivalent thermal current is based on the greater RMS phase current. Ith = ILMAX = max(IL1RMS, IL2RMS, IL3RMS); the computed RMS
value takes into account the contribution of fundamental and harmonic up to eleventh order.
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NC2 0 - Manual - 01 - 2 015
TECHNICAL DATA
RMS Phase overcurrent - 50/51[1]
I>AL element
ICLP>AL Activation time (tCLP>AL) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50/51 Alarm threshold definite time (I>ALdef) 0.100...10.00
I
n
0.100...0.999 In (step 0.001 In)
1.00...10.00 In (step 0.01 In)
I>ALdef within CLP (ICLP>ALdef) 0.100...10.00
I
n
0.100...0.999 In (step 0.001 In)
1.00...10.00 In (step 0.01 In)
I>ALdef Operate time (t>ALdef) 0.03...200 s
0.03...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
I> Element
I> Curve type (I>Curve) DEFINITE
IEC/BS A, B, C
ANSI/IEEE MI, VI, EI
CAPACITOR
ICLP> Activation time (tCLP>) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I> Reset time delay (t>RES) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50/51 First threshold definite time (I>def) 0.100...10.00 In
0.100...0.999 In (step 0.001 In)
1.00...10.00 In (step 0.01 In)
I>def within CLP (ICLP>def) 0.100...10.00 In
0.100...0.999 In (step 0.001 In)
1.00...10.00 In (step 0.01 In)
I>def Operating time (t>def) 0.03...200.00 s
0.03...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
Inverse time[2]
50/51 First threshold inverse time (I>inv) 0.100...10.00 In
0.100...0.999 In (step 0.001 In)
1.00...10.00 In (step 0.01 In)
I>inv within CLP (ICLP>inv) 0.100...10.00 In
0.100...0.999 In (step 0.001 In)
1.00...10.00 In (step 0.01 In)
I>inv Operating time (t>inv) 0.02...60.0 s
0.02...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
Pickup time ≤ 0.03 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.03 s
Pickup accuracy ± 0.5% with 0.1 In,±0.2% with 1 In
Operate time accuracy 5% or ± 10 ms
Note 1 The RMS 50/51 protection is based on RMS value measurement of three phase currents (the computed RMS value takes into account the con-
tribution of fundamental and harmonic up to eleventh order).
Note 2
Standard Inverse Time (IEC 255-3/BS142 type A or SIT): t = 0.14 · t>inv / [(IRMS/I>inv)0.02 - 1]
Very Inverse Time (IEC 255-3/BS142 type B or VIT): t = 13.5 · t>inv / [(IRMS/I>inv) - 1]
Extremely Inverse Time (IEC 255-3/BS142 type C or EIT): t = 80 · t>inv / [(IRMS/I>inv)2 - 1]
Moderately Inverse (ANSI/IEEE type MI): t = t>inv · {0.01 / [(IRMS/I>inv)0.02 - 1] + 0.023}
Very Inverse (ANSI/IEEE type VI): t = t>inv · {3.922 / [(IRMS/I>inv)2- 1] + 0.098}
Extremely Inverse (ANSI/IEEE type EI): t = t>inv · {5.64 / [(IRMS/I>inv)2- 1] + 0.024}
CAPACITOR: t = t>inv · {50000 / [1.1 · (IRMS/I>inv)17 - 1]} + 0.1
I
RMS:RMS input current
t:operate time
I>inv:threshold setting
t>inv:operate time setting
Asymptotic reference value: 1.1 I>inv
Minimum operate time: 0.1 s
Equation is valid for 1.1 ≤ IRMS/I>inv ≤ 20
With I>inv pickup ≥ 2.5 In, the upper limit is 50 In
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20 NC2 0 - Manual - 01 - 2 015 TECHNICAL DATA
Phase overcurrent - 50/51 Fundamental
I>> Element
ICLP>> Activation time (tCLP>>) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I>> Reset time delay (t>>RES)0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50/51 Second threshold definite time (I>>def) 0.100...40.0 In
0.100...0.999 In (step 0.001 In)
1.00...9.99 In (step 0.01 In)
10.0...40.0 In (step 0.1 In)
I>>def within CLP (ICLP>>def) 0.100...40.0 In
0.100...0.999 In (step 0.001 In)
1.00...9.99 In (step 0.01 In)
10.0...40.0 In (step 0.1 In)
I>>def Operating time (t>>def) 0.03...10.00 s (step 0.01 s)
I>>> Element
ICLP>>> Activation time (tCLP>>>) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I>>> Reset time delay (t>>>RES)0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50/51 Third threshold definite time (I>>>def) 0.100...40.0 In
0.100...0.999 In (step 0.001 In)
1.00...9.99 In (step 0.01 In)
10.0...40.0 In (step 0.1 In)
I>>>def within CLP (ICLP>>>def) 0.100...40.0 In
0.100...0.999 In (step 0.001 In)
1.00...9.99 In (step 0.01 In)
10.0...40.0 In (step 0.1 In)
I>>>def Operating time (t>>>def) 0.03...10.00 s (step 0.01 s)
Pickup time ≤ 0.03 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.03 s
Pickup accuracy ± 0.5% with 0.1 In,±0.2% with 1 In
Operate time accuracy 5% or ± 10 ms
Residual overcurrent - 50N/51N[1]
IE> Element
IE> Curve type (IE>Curve) DEFINITE
IEC/BS A, B, C
ANSI/IEEE MI, VI, EI
IECLP> Activation time (tECLP>) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
IE> Reset time delay (tE>RES) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50N/51N First threshold definite time (IE>def) 0.100...10.00 In
0.100...0.999 In (step 0.001 In)
1.00...10.00 In (step 0.01 In)
IE>def within CLP (IECLP>def) 0.100...10.00 In
0.100...0.999 In (step 0.001 In)
1.00...10.00 In (step 0.01 In)
IE>def Operating time (tE>def) 0.04...200 s
0.04...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
Note 1 The residual current is calculated from the vector sum of the three phase currents (IEC = IL1 + IL2 + IL3 ).
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