Thytronic NV10P User manual

NV10P - Manual - 01 - 2015
MANUAL
NV10P
MULTIFUNCTION VOLTAGE AND FREQUENCY
PROTECTION RELAY
This document applies to NV10P devices with firmware release 3.20 and following.

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2NV10P - Manual - 01 - 2015
TABLE OF CONTENTS
TABLE OF CONTENTS
1 INTRODUCTION 5
Scope and liability...........................................................................................................................................................................................5
Applicability......................................................................................................................................................................................................5
Conformity ........................................................................................................................................................................................................5
Technical support............................................................................................................................................................................................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
Main features.................................................................................................................................................................................................11
Photo ...............................................................................................................................................................................................................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
Voltage input circuits....................................................................................................................................................................................14
Residual voltage input circuit......................................................................................................................................................................14
Binary input circuits......................................................................................................................................................................................14
3.3 OUTPUT CIRCUITS............................................................................................................................................................................................14
Relays..............................................................................................................................................................................................................14
3.4 MMI.....................................................................................................................................................................................................................14
3.5 COMMUNICATION INTERFACES ...................................................................................................................................................................15
Local port........................................................................................................................................................................................................15
Remote ports..................................................................................................................................................................................................15
3.6 GENERAL SETTINGS FOR INDUCTIVE VTs VERSIONS...............................................................................................................................16
3.6.1 GENERAL SETTINGS FOR SENSOR VERSIONS ...........................................................................................................................................16
3.7 PROTECTIVE FUNCTIONS ...............................................................................................................................................................................16
Thermal protection with Pt100 probes - 26 ...............................................................................................................................................16
Undervoltage - 27 for inductive VTs versions...........................................................................................................................................16
Undervoltage - 27 for electronic sensor versions ...................................................................................................................................17
Positive sequence undervoltage - 27V1 for inductive VTs versions.....................................................................................................17
Positive sequence undervoltage - 27V1 for electronic sensor versions .............................................................................................17
Overvoltage - 59 for inductive VTs versions............................................................................................................................................. 18
Overvoltage - 59 for electronic sensor versions..................................................................................................................................... 18
Ten minutes overvoltage - 59Uavg for inductive VTs versions............................................................................................................. 19
Ten minutes overvoltage - 59Uavg [1] for electronic sensor versions.................................................................................................. 19
Residual overvoltage - 59N for inductive VTs versions ......................................................................................................................... 19
Residual overvoltage - 59N for electronic sensor versions.................................................................................................................. 20
Negative sequence overvoltage - 59V2 for inductive VTs versions .................................................................................................... 20
Negative sequence overvoltage - 59V2 for electronic sensor versions............................................................................................. 20
Underfrequency (81U) ..................................................................................................................................................................................21
Overfrequency (81O).....................................................................................................................................................................................21
Frequency rate of change (81R)..................................................................................................................................................................22
Breaker failure - BF.......................................................................................................................................................................................22
3.8 CONTROL AND MONITORING....................................................................................................................................................................... 23
Frequency tracking...................................................................................................................................................................................... 23
Trip Circuit Supervision - 74TCS................................................................................................................................................................. 23
Circuit Breaker supervision........................................................................................................................................................................ 23

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NV10P - Manual - 01 - 2015
Oscillography (DFR) ..................................................................................................................................................................................... 23
PLC (Programmable Logic Controller) ...................................................................................................................................................... 23
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....................................................................................................................................................................................................31
Use of measured values...............................................................................................................................................................................32
Binary inputs ................................................................................................................................................................................................. 33
Output relays..................................................................................................................................................................................................37
LED indicators............................................................................................................................................................................................... 39
Communication interfaces...........................................................................................................................................................................41
4.4 PROTECTIVE ELEMENTS .................................................................................................................................................................................42
Rated values...................................................................................................................................................................................................42
Thermal protection with RTD thermometric probes - 26 ....................................................................................................................... 50
Undervoltage - 27..........................................................................................................................................................................................52
Positive sequence undervoltage - 27V1....................................................................................................................................................56
Overvoltage - 59............................................................................................................................................................................................ 58
Average overvoltage (59avg).......................................................................................................................................................................62
Residual overvoltage - 59N..........................................................................................................................................................................64
Negative sequence overvoltage - 59V2.................................................................................................................................................... 69
Overfrequency - 81O.....................................................................................................................................................................................71
Underfrequency - 81U ................................................................................................................................................................................. 73
Application notes about over-under frequency elements - 81U and 81O............................................................................................77
Frequency rate of change - 81R................................................................................................................................................................. 80
Breaker failure - BF.......................................................................................................................................................................................84
4.5 CONTROL AND MONITORING........................................................................................................................................................................86
Logical block - BLOCK1................................................................................................................................................................................86
Virtual I/O with Ethernet messages........................................................................................................................................................... 88
Remote tripping .............................................................................................................................................................................................92
Frequency tracking...................................................................................................................................................................................... 93
Trip circuit supervision - 74TCS...................................................................................................................................................................94
Circuit breaker supervision .........................................................................................................................................................................97
Oscillography ............................................................................................................................................................................................. 100
5 MEASURES, LOGIC STATES AND COUNTERS 101
Measures......................................................................................................................................................................................................101
Protection.....................................................................................................................................................................................................101
Delayed inputs.............................................................................................................................................................................................101
Internal states..............................................................................................................................................................................................101
Relays............................................................................................................................................................................................................101
Counters........................................................................................................................................................................................................101
Self test .........................................................................................................................................................................................................102
Fault recording - SFR..................................................................................................................................................................................102
Event recording - SER................................................................................................................................................................................ 103
Oscillography - DFR ................................................................................................................................................................................... 103
6 INSTALLATION 105
6.1 PACKAGING.....................................................................................................................................................................................................105
6.2 MOUNTING......................................................................................................................................................................................................105
6.3 ELECTRICAL CONNECTIONS ....................................................................................................................................................................... 109

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6.4 LED ALLOCATION............................................................................................................................................................................................116
6.5 FINAL OPERATIONS .......................................................................................................................................................................................116
7 PROGRAMMING AND SETTINGS 117
7.1 ThySetter SW...................................................................................................................................................................................................117
ThySetter installation..................................................................................................................................................................................117
ThySetter use ...............................................................................................................................................................................................117
7.2 MMI (Man Machine Interface) ................................................................................................................................................................... 118
Reading variables (READ)......................................................................................................................................................................... 118
Setting modifying (SET) ............................................................................................................................................................................. 119
TEST.............................................................................................................................................................................................................. 120
COMMUNICATION..................................................................................................................................................................................... 120
Circuit breaker commands ....................................................................................................................................................................... 120
Enable / block changes via keyboard - Password.................................................................................................................................121
7.3 MENU TREE..................................................................................................................................................................................................... 123
7.4 MODULES MANAGEMENT ...........................................................................................................................................................................127
7.5 MAINTENANCE...............................................................................................................................................................................................127
7.6 REPAIR..............................................................................................................................................................................................................127
7.7 PACKAGING.....................................................................................................................................................................................................127
8 APPENDIX 128
8.1 APPENDIX A1 - I/O Diagram ....................................................................................................................................................................... 128
8.2 APPENDIX A2 - Interfaces ........................................................................................................................................................................... 130
8.3 APPENDIX A3 - Protective functions ..........................................................................................................................................................131
8.4 APPENDIX A4 - Connection diagrams ........................................................................................................................................................132
8.5 APPENDIX B1 - NV10P Dimensions.............................................................................................................................................................137
8.6 APPENDIX B2 - V-Sensor Dimensions....................................................................................................................................................... 138
8.7 APPENDIX B3 - ThySensor Dimensions .................................................................................................................................................... 139
8.8 APPENDIX C - Setting table ......................................................................................................................................................................... 140
8.9 APPENDIX D - Revisions history ................................................................................................................................................................. 238
8.10 APPENDIX E - EC Declaration of conformity............................................................................................................................................. 239

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NV10P - Manual - 01 - 2015
INTRODUCTION
1 INTRODUCTION
1 INTRODUCTION
Scope and liability
This document describes the functions, the technical data of NV10P devices; instructions for mount-
ing, setting and commissioning are included. All the protective functions included in the NV10P
version (27, 59, 59N, 81O, 81U, 81R) are exposed; they are valid for the same protective functions
included in the Basic versions NV10B (27, 59, 59N).
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 NV10P devices with firmware release 3.20 and following.
Conformity
The product complies with the CEE directives:
EMC Council Directives: 2004/108/EC
Low voltage Directives: 2006/95/CE (replaces 73/23/CEE)
Technical support
Contact: Service tecnico THYTRONIC www.thytronic.it
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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6NV10P - Manual - 01 - 2015 INTRODUCTION
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 NV10 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.: 27= ANSI code concerning the undervoltage element.
Following text formats are used:
The ThySetter[1] menu:
Undervoltage - 27
The parameter description (measures, thresholds, operate time,...) and related value:
U> element
Definite time
U>def
The display messages (MMI) are shown as:
NV10
Notes are highlighted with cursive letters inside colored bar
Note: Useful description note
Glossary/definitions
27 Undervoltage ANSI code
59 Overvoltage ANSI code
59N Residual voltage ANSI code
81O Overfrequency ANSI code
81U Underfrequency ANSI code
81R Frequency rate of change ANSI code
BF Breaker Failure
74VT VT monitoring
74TCS Trip Circuit Supervision
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
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)
Note 1 The graphic interface and the operation of the ThySetter software are described in the relative chapters
•
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NV10P#JA2MM00
UAUX 110-230 Vac/dc
100V
100V UEn
Un
1
2
3
4
5
NV10P#0A2MM02
UAUX 110-230 Vac/dc
20 kV
UNP
1
2
3
4
5
Inductive VT versions Electronic sensor versions
NV10P#JA2MM00
UAUX 110-230 Vac/dc
100V
100V UEn
Un
1
2
3
4
5
NV10P#0A2MM02
UAUX 110-230 Vac/dc
20 kV
UNP
1
2
3
4
5
Inductive VT versions Electronic sensor versions

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NV10P - Manual - 01 - 2015
INTRODUCTION
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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8NV10P - Manual - 01 - 2015 INTRODUCTION
Symbols-en.ai
Symbols
U>> Start
U>> BF_OUT
IPh Block2
Logic internal signal (output); may be a logical state (e.g.U>> 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 59 element)
It is not available for reading (missing arrow)
AND and NAND logic gates
OR and NOR logic gates
Limit block (U>> threshold).
Computation block (Max phase voltage)
Threshold setting (e.g. pickup
U>>) .
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
UL3
Max[IL1 ,IL2 ,IL3 ]
UL2
UL1
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
U>>
UU ≥
U>>
tON
RESET
0T
0T

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NV10P - Manual - 01 - 2015
INTRODUCTION
Symbols1-en.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 NV10P - Manual - 01 - 2015 GENERAL
2 GENERAL
2 GENERAL
Preface
The relay type NV10P can be typically used in HV, MV and LV distribution systems, on transformers
or for electrical machines.
It can be used for system decoupling, load shedding and loss of main (islanding) protection.
In addition to the main protection element, the breaker failure (BF) , Trip Circuit Supervision (TCS) and
programmable logic (PLC) are also provided are also provided.
Input circuits for inductive VTs TV or direct connection
Following input circuits are available:
Three voltages (line-to-line) with nominal voltages programmable in the range 50...130 V (UR=100V)
or 200...520 V (UR = 400V) and one residual voltage input with nominal voltage programmable in the
range 50...130 V (UER=100V).
Input circuits for electronic Sensor
Following input circuits are available:
Three voltages (line-to-ground) with 20/√3 kV nominal voltage); the residual voltage is calculated
from phase voltages.
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 if enabled.
According to the hardware configurations, the NV10P 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.
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- Protective & control functions
27 Phase undervoltage
27V1 Positive sequence undervoltage
59 Phase overvoltage
59V2 Negative sequence overvoltage
59N Residual overvoltage
59Uavg Average overvoltage
81O Overfrequency
81U Underfrequency
81R Frequency rate of change
BF Circuit breaker failure
74TCS Trip circuit supervision
ARF Automatic reclosure
(optional for pv plants)
74TCS BF
59N
27 27V1
81O 81R81U
59V2
59
DDI
DDI
2xTV
fase-fase
ARF
59Uavg
PROTECTION RELAY
NV
10 P
I
BF ARF
Σ
59N
27
27V1
81O
81U
59V2
59 59Uavg
PROTECTION RELAY
NV 10 P
U12,U23,U31
UEC
- Protective & control functions
27 Phase undervoltage
27V1 Positive sequence undervoltage
59 Phase overvoltage
59V2 Negative sequence overvoltage
59N Residual overvoltage
59Uavg Average overvoltage
81O Overfrequency
81U Underfrequency
81R Frequency rate of change
BF Circuit breaker failure
74TCS Trip circuit supervision
ARF Automatic reclosure
(optional for pv plants)
74TCS BF
59N
27 27V1
81O 81R81U
59V2
59
DDI
DDI
2xTV
fase-fase
ARF
59Uavg
PROTECTION RELAY
NV
10 P
I
BF ARF
Σ
59N
27
27V1
81O
81U
59V2
59 59Uavg
PROTECTION RELAY
NV 10 P
U12,U23,U31
UEC

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NV10P - Manual - 01 - 2015
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® or IEC61850 protocol, with RJ45 (cop-
per 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).
Photo
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12 NV10P - Manual - 01 - 2015 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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NV10P - Manual - 01 - 2015
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 NV10P - Manual - 01 - 2015 TECHNICAL DATA
3.2 INPUT CIRCUITS
Auxiliary power supply Uaux
Voltage
Nominal value (range) 24...48 V~/- or 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)
Voltage input circuits
Relay phase to phase nominal voltage Un[1] 50...130 V (UR= 100 V)
200...520 V (UR= 400 V)
Relay phase nominal voltage En= Un/ √3 -
Permanent overload 1.3 UR
Thermal overload (1 s) 2 UR
Rated consumption (for any phase) ≤ 0.5 VA
Residual voltage input circuit
Relay residual nominal voltage UEn 50...130 V
Permanent overload 130 V
Thermal overload (1 s) 200 V
Rated consumption ≤ 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
3.4 MMI
Display LCD alphanumeric 16x4
LEDs
Quantity 8
ON/fail (green) 1
Start (yellow) 1
Trip (red) 1
Freely allocatable (red) 5
Keyboard 8 keys
Note 1 UR= 100 V or UR= 400 V version must be selected at ordering
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NV10P - Manual - 01 - 2015
TECHNICAL DATA
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,
IEC 61850 - Level A
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16 NV10P - Manual - 01 - 2015 TECHNICAL DATA
3.6 GENERAL SETTINGS FOR INDUCTIVE VTs VERSIONS
Relay nominal frequency (fn) 50, 60 Hz
Relay nominal voltage (Un) 50...130 V [1] (step 1 V)
200...520 V
[2] (step 1 V)
Relay residual nominal voltage (UEn) 50...130 V (step 1 V)
Calculated relay residual nominal voltage (UECn) UECn = √3Un
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)
Residual primary nominal voltage (phase-to-phase) ∙√3 (UEnp) 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)
3.6.1 GENERAL SETTINGS FOR SENSOR VERSIONS
Relay nominal frequency (fn) 50, 60 Hz
Relay nominal voltage (Un) 50...130 V[2] (step 1 V)
Relay residual nominal voltage (En) En= Un/√3
Calculated relay residual nominal voltage (UECn) UECn = √3Un= 3 En
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
Thermal protection with Pt100 probes - 26[3]
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 for inductive VTs versions
Common configuration:
27 Operating logic (Logic27) AND/OR
U< Element
U< Curve type (U<Curve) DEFINITE/INVERSE[4]
Definite time
27 First threshold definite time (
U <def) 0.05...1.10 Un (step 0.01 Un)
U<def Operating time (tU<def) 0.07...100.0 s
0.07...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)
Element U<<
Definite time
27 Second threshold definite time (
U <<def) 0.05...1.10 Un (step 0.01 Un)
U<<def Operating time (tU<<def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Note 1 The setting ranges of the relay nominal voltage Unare dependent on the version (to be selected on purchase), with reference voltages UR100 V
or 400 V.
Note 2 When the rated voltage of the electricity network divided by √ 3 corresponds to the value of rated primary voltage of the sensors (20000 / √ 3),
then the nominal voltage of the relay must be adjusted to Un = 100 V (default setting).
Note 3 The 26 element is available when the MPT module is connect on Thybus and enabled
Note 4 The mathematical formula for INVERSE curve is: t= (0.75 ∙ tU<inv) / [1 - (U/U<inv)]
t = operating time (in seconds)
t
U<inv = operating time setting (in seconds)
U = input voltage
U<inv = threshold setting
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Pickup time ≤ 0.04 s
Dropout ratio 1.03...1.05
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% Un/En
Operate time accuracy 5% or ± 10 ms
Undervoltage - 27 for electronic sensor versions
Common configuration:
Voltage measurement type for 27 (Utype27) Uph-ph/Uph-n
27 Operating logic (Logic27) AND/OR
U< Element
U< Curve type (U<Curve) DEFINITE/INVERSE[1]
Definite time
27 First threshold definite time (
U <def) 0.05...1.10 Un/En (step 0.01 Un/En)
U<def Operating time (tU<def) 0.07...100.0 s
0.07...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/En (step 0.01 Un/En)
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)
Element U<<
Definite time
27 Second threshold definite time (
U <<def) 0.05...1.10 Un/En (step 0.01 Un/En)
U<<def Operating time (tU<<def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time ≤ 0.04 s
Dropout ratio 1.03...1.05
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% Un/En
Operate time accuracy 5% or ± 10 ms
Positive sequence undervoltage - 27V1 for inductive VTs versions
U1< Element
Definite time
27V1 First threshold definite time (U1<def) 0.05...1.10 Un (step 0.01 Un)
U1<def Operating time (tU1<def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time ≤ 0.04 s
Dropout ratio 1.03...1.05
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% Un
Operate time accuracy 5% o ± 10 ms
Positive sequence undervoltage - 27V1 for electronic sensor versions
U1< Element
Definite time
27V1 First threshold definite time (U1<def) 0.05...1.10 En (step 0.01 En)
U1<def Operating time (tU1<def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time ≤ 0.04 s
Dropout ratio 1.03...1.05
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% En
Operate time accuracy 5% o ± 10 ms
Note 1 The mathematical formula for INVERSE curve is: t= (0.75 ∙ tU<inv) / [1 - (U/U<inv)]
t = operating time (in seconds)
t
U<inv = operating time setting (in seconds)
U = input voltage
U<inv = threshold setting
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18 NV10P - Manual - 01 - 2015 TECHNICAL DATA
Overvoltage - 59 for inductive VTs versions
Common configuration:
59 Operating logic (Logic59) AND/OR
U> Element
U> Curve type (U>Curve) DEFINITE/INVERSE[1]
Definite time
59 First threshold definite time (
U >def) 0.50...1.50 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
59 First threshold inverse time (
U >inv) 0.50...1.50 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
59 Second threshold definite time (
U >>def) 0.50...1.50 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 ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% Un/En
Operate time accuracy 5% or ± 10 ms
Overvoltage - 59 for electronic sensor versions
Common configuration:
Voltage measurement type for 59 (Utype59) Uph-ph/Uph-n
59 Operating logic (Logic59) AND/OR
U> Element
U> Curve type (U>Curve) DEFINITE/INVERSE[2]
Definite time
59 First threshold definite time (
U >def) 0.50...1.50 Un/En (step 0.01 Un/En)
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
59 First threshold inverse time (
U >inv) 0.50...1.50 Un/En (step 0.01 Un/En)
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
59 Second threshold definite time (
U >>def) 0.50...1.50 Un/En (step 0.01 Un/En)
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 ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% Un/En
Operate time accuracy 5% or ± 10 ms
Note 1 The mathematical formula for INVERSE curve is: t = (0.5 ∙ tU>inv) / [(U/U>inv) - 1]
t = operating time (in seconds)
t
U>inv = operating time setting (in seconds)
U = input voltage
U>inv= threshold setting
Note 2 The mathematical formula for INVERSE curve is: t = (0.5 ∙ tU>inv) / [(U/U>inv) - 1]
t = operating time (in seconds)
t
U>inv = operating time setting (in seconds)
U = input voltage
U>inv= threshold setting
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NV10P - Manual - 01 - 2015
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Ten minutes overvoltage - 59Uavg [1] for inductive VTs versions
Common configuration:
Operating logic (Logic59Uavg) AND/OR
Uavg> Element
Definite time
First threshold definite time (
U
avg >def) 0.50...1.50 Un (step 0.01 Un)
Time delay (tUavg>def) 0...1000 s (step 1 s)
Pickup time according to the reference conditions[2]
Pickup accuracy ± 1% ± 1% Un
Time delay accuracy[3] 5%± 3 s
Ten minutes overvoltage - 59Uavg [1] for electronic sensor versions
Common configuration:
Voltage measurement type (Utype59Uavg) Uph-ph/Uph-n
Operating logic (Logic59Uavg) AND/OR
Uavg> Element
Definite time
First threshold definite time (
U
avg >def) 0.50...1.50 Un (step 0.01 Un/En)
Time delay (tUavg>def) 0...1000 s (step 1 s)
Pickup time according to the reference conditions[2]
Pickup accuracy ± 1% ± 1% Un/En
Time delay accuracy[3] 5%± 3 s
Residual overvoltage - 59N for inductive VTs versions
Common configuration:
Residual voltage measurement type for 59N - direct/calculated (
3 VoType59N) UE /UEC
Operation from 74VT external (74VText59N) OFF /Block
U
E> Element
U> Curve type (U>Curve) DEFINITE/INVERSE[4]
UE> Reset time delay (tUE>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
59N First threshold definite time (
U
E>def) 0.01...0.70 UEn (step 0.01 UEn)
UE>def Operating time (tUE>def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Inverse time
59N First threshold inverse time (
U
E>inv) 0.01...0.50 UEn (step 0.01 UEn)
UE>inv Operating time (tUE>inv) 0.10...100.0 s
0.10...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Element
U
E>>
UE>> Reset time delay (tUE>>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
59N Second threshold definite time (
U
E>>def) 0.01...0.70 UEn (step 0.01 UEn)
UE>>def Operating time (tUE>>def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
UE>> Reduced Operating time (tcUE>>def) 0.07...10.00 s (step 0.01 s)
tcUE>> Activation time (tatcUE>>) 1...60 s (step 1 s)
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% UEn
Operate time accuracy 5% or ± 10 ms
Note 1 The function is based on the measurement of the mean of the three phase voltages of 10 minutes with update every three seconds
Note 2 The pickup time depends on the initial and final value of the input voltage; e.g. with a setting of threshold equal to 1.10 Un:
- with initial value 0 and final value 1.1 Uavg> def (1.1x1.1 = 1.21 Un) the pickup time is 498 s
- with initial value 0.9 Uavg>def (0.9x1.1 = 0.99 Un) and final value 1.1 Uavg>def (1.1x1.1 = 1.21 Un) the pickup time is 285 s
Note 3 Since the aggregate value is updated every 3 s, times are only meaningful in multiples of 3 s
Note 4 The mathematical formula for INVERSE curve is t= (0.5 ∙ tUE>inv) / [(UE/UE>inv) - 1]
t = operating time (in seconds)
t
UE>inv = operating time setting (in seconds)
UE= residual input voltage (direct or calculated)
UE>inv = threshold setting
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Residual overvoltage - 59N for electronic sensor versions
Common configuration:
Residual voltage measurement type for 59N - (
3 VoType59N) UEC
Operation from 74VT external (74VText59N) OFF /Block
U
E> Element
U> Curve type (U>Curve) DEFINITE/INVERSE[1]
UE> Reset time delay (tUE>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
59N First threshold definite time (
U
E>def) 0.01...0.70 UEn (step 0.01 UEn)
UE>def Operating time (tUE>def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Inverse time
59N First threshold inverse time (
U
E>inv) 0.01...0.50 UEn (step 0.01 UEn)
UE>inv Operating time (tUE>inv) 0.10...100.0 s
0.10...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Element
U
E>>
UE>> Reset time delay (tUE>>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
59N Second threshold definite time (
U
E>>def) 0.01...0.70 UEn (step 0.01 UEn)
UE>>def Operating time (tUE>>def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
UE>> Reduced Operating time (tcUE>>def) 0.07...10.00 s (step 0.01 s)
tcUE>> Activation time (tatcUE>>) 1...60 s (step 1 s)
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% UEn
Operate time accuracy 5% or ± 10 ms
Negative sequence overvoltage - 59V2 for inductive VTs versions
U2> Element
Definite time
59V2 First threshold definite time (U2>def) 0.01...0.50 Un (step 0.01 Un)
U2>def Operating time (tU2>def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% Un
Operate time accuracy 5% or ± 10 ms
Negative sequence overvoltage - 59V2 for electronic sensor versions
U2> Element
Definite time
59V2 First threshold definite time (U2>def) 0.01...0.50 Un (step 0.01 En)
U2>def Operating time (tU2>def) 0.07...100.0 s
0.07...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 1% ± 1% En
Operate time accuracy 5% or ± 10 ms
Note 1 The mathematical formula for INVERSE curve is t= (0.5 ∙ tUE>inv) / [(UE/UE>inv) - 1]
t = operating time (in seconds)
t
UE>inv = operating time setting (in seconds)
UE= residual input voltage (calculated), UE>inv = threshold setting
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