PCS 978s x technical manual EN overseas general x r1 20

Preface About This Manual The manual describes the protection, control, measurement and supervision functions with the information of relevant hardware for PCS-978S Transformer Relay..

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Although every reasonable effort is made to present current and accurate inform ation, this document does not purport to cover all details or variations in equipment nor provide for every possible contingency to be met in connection with installation, operation, or maintenance Should further information be desired or should particular problems arise which are not covered sufficiently for your purposes, please do not hesitate to contact us

Preface

About This Manual

The manual describes the protection, control, measurement and supervision functions with the information of relevant hardware for PCS-978S Transformer Relay

Safety Information

This manual is not a complete index of all safety measures required for operation of the equipment (module or device) However, it comprises important information that must be followed for personal safety, as well as to avoid material damage Information is highlighted and illustrated

as follows according to the degree of danger:

Indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury

Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury

Indicates a potentially hazardous situation that, if not avoided, may result

in minor or moderate injury or equipment damage

Indicates that property damage can result if the measures specified are

not taken

Important information about the device, product handling or a certain section of the documentation which must be given particular attention

Instructions and Warnings

The following hazard statements apply to this device

Disconnect or de-energize all external connections BEFORE opening this

device Contact with hazardous voltages and currents inside this device can cause electrical shock resulting in injury or death

Contact with instrument terminals can cause electrical shock that can result in injury or death

Use of this equipment in a manner other than specified in this manual can impair operator safety safeguards provided by this equipment

Have only qualified personnel service this equipment If you are not qualified to service this equipment, you can injure yourself or others, or cause equipment damage

This device is shipped with default passwords Default passwords should

be changed to private passwords at installation Failure to change each default password to a private password may allow unauthorized access

NR shall not be responsible for any damage resulting from unauthorized access

DO NOT look into the fiber (laser) ports/connectors

DO NOT look into the end of an optical cable connected to an optical

output

DO NOT perform any procedures or adjustments that this instruction

manual does not describe

During installation, maintenance, or testing of the optical ports, ONLY use the test equipment qualified for Class 1 laser products!

Incorporated components, such as LEDs, transceivers, and laser emitters,

are NOT user serviceable Return units to NR for repair or replacement

Equipment components are SENSITIVE to electrostatic discharge (ESD)

Undetectable permanent damage can result if you do not use proper ESD procedures Ground yourself, your work surface, and this equipment

BEFORE removing any cover from this equipment If your facility is not

equipped to work with these components, contact NR about returning this device and related NR equipment for service

Insufficiently rated insulation can deteriorate under abnormal operating conditions and cause equipment damage For external circuits, use wiring

of SUFFICIENTLY RATED insulation that will not break down under

abnormal operating conditions

SEVERE power and ground problems can occur on the communications

ports of this equipment as a result of using non-standard cables Please use the wiring method recommended in the manual for communication terminals

DO NOT connect power to the relay until you have completed these

procedures and receive instruction to apply power Equipment damage can result otherwise

Use of controls or adjustments, or performance of procedures other than

those specified herein, may RESULT IN hazardous radiation exposure

The firmware may be upgraded to add new features or enhance/modify

existing features, please MAKE SURE that the version of this manual is

compatible with the product in your hand

Document Conventions

 The abbreviations and acronyms in this manual are explained in “Appendix A Glossary” The

Glossary also contains definitions of important terms

 Menu path is connected with the arrow "→" and bold

For example: the access path of protection settings is: MainMenu→Settings→Protection Settings

 Settings not in the table should be placed in brackets

For example: the system setting [Opt_SysFreq]

 Cross-references are presented in italics

For example: refer to Figure 1.1-1, refer to Table 1.1-1, reference to Section 1.1

 Binary input signals, binary output signals, analogs, LED lights, buttons, and other fixed meanings, should be written in double quotes and bold

For example: press the button "ENT"

on the target sections of this manual as your job needs and responsibilities dictate An overview of each manual section and section topics follows

7 System Functions

Describes how to perform fundamental operations such as clock synchronization, communicating with the device, switching active setting group, checking relay status, reading event reports and SER (Sequential Events Recorder) records

Describes the abbreviations adopted in this manual

Document Revision History

PN: ZL_PCS-978S_X_Technical Manual_EN_Overseas General_X

R1.10 R1.20 2019-12-09

 Modification of voltage selection diagram

 Update of switchgear control function

 Update of VT circuit supervision

 Update of technical data

 Add switchgear position verification

 Add the description about digital substation application

 Add the description about digital interface

 Add technical data of GOOSE and SV

 Add certifications of IEC 61850, DNP, PRP, HSR, IEEE

1588

 Add alarm signals of GOOSE and SV

 Add NET-DSP plug-in module (NR6112B)

 Add SV communication settings

 Add GOOSE send links and receiving links

 Add SV links

 Add reactor protection application scenario

 Update of technical data

 Add reactor current differential protection function 87R and inter-turn fault protection function 21IT

 Add binary input and binary output module NR6661

 Add mechanical relay input and output module NR6662

 Replace the NET-DSP module NR6112B with NR6113

 Deletion of the DC analogue input module NR6631B

Figure 1.1-1 Two-winding transformer 1-1

Figure 1.1-2 Three-winding transformer 1-1

Figure 1.1-3 Auto-transformer with two sides 1-2

Figure 1.1-4 Auto-transformer with three sides 1-2

Figure 1.1-5 Typical application of an auto-transformer 1-3

Figure 1.1-6 Typical application of a shunt reactor 1-3

1

1

1.1 Application

PCS-978S transformer relay provides fast and selective protection, control and monitoring for

two-winding transformers, three-winding transformers, auto-transformers, as well as shunt

reactors The full transformer protections are configurable by user Ancillary functions of fault

diagnostic, disturbance records, event records and communication function are integrated in the

Figure 1.1-4 Auto-transformer with three sides

The function diagrams for protecting an auto-transformer and a reactor are respectively shown below

51P Alm 87W 87T

Figure 1.1-5 Typical application of an auto-transformer

52 52

Figure 1.1-6 Typical application of a shunt reactor

1

The PCS-978S is applicable not only to conventional substations, but also to digital substations It supports IEC 61850 Editions 1 and 2 and provides GOOSE and SV network interfaces with high real-time performance The process level network supports peer-to-peer (P2P) mode and networking mode, including single network mode and dual network mode The station level network could also receive and send MMS messages (such as interlocking signals) or process level GOOSE messages (such as trip signals)

1.2 Protection Functions

ANSI Protection Functions Remark

87T Transformer differential protection

 Biased differential protection with three slopes

 Biased DPFC differential protection

 Unrestrained instantaneous differential protection

 Optional inrush current distinguished principles: harmonic criterion or waveform distortion

 Optional harmonic blocking modes: self-adaptive 1Pblk1P mode, 2PBlk3P mode, 1Pblk3P mode

 Overexcitation detection: fifth harmonic or third harmonic criterion

 Optional transfer methods: △→Y or Y→△

 Independent CT saturation criterion

 Differential CT circuit failure supervision

64REF Restricted earth-fault protection

 Optional direction element

 CT transient characteristic difference detection

 CT saturation detection based on 2nd and 3rd harmonics

87W Winding differential protection

 CT transient characteristic difference detection

 CT saturation detection based on 2nd and 3rd harmonics

87R Reactor differential protection

 Biased DPFC differential protection

 Biased current differential protection

 Independent CT saturation criterion

 Harmonic blocking criterion

 Differential CT circuit failure supervision

21IT Inter-turn fault protection

 Zero-sequence power directional element and zero-sequence impedance element

 CT and VT circuit failure blocking

24 Overexcitation protection

 Two stages definite-time overexcitation protection

 Stage 1 of definite-time overexcitation protection for trip purpose

 Stage 2 of definite-time overexcitation protection for alarm purpose

 One stage inverse-time overexcitation protection for both alarm purpose and trip purpose

1

ANSI Protection Functions Remark

67P

50/51P Phase overcurrent protection

 6 stages with independent logic by default

 Voltage control element for each stage

 Optional direction element for each stage

 Optional definite-time characteristic and inverse-time characteristic for each stage

 Trip purpose or alarm purpose for each stage

 Harmonic control element for each stage

67G

50/51G Earth fault protection

 4 stages with independent logic by default

 Optional direction element for each stage

 Optional measured zero-sequence current or calculated zero-sequence current

 Optional definite-time characteristic and inverse-time characteristic for each stage

 Selectable trip purpose or alarm purpose for each stage

 Harmonic control element for each stage

67Q

50/51Q

Negative-sequence overcurrent

protection

 Up to 2 stages with independent logic

 Optional direction element for each stage

 Optional definite-time characteristic and inverse-time characteristic for each stage

49 Thermal overload protection

 Two stages thermal overload protection, and one stage for alarm purpose and the other stage for trip purpose

50BF Breaker failure protection

 Up to 6 circuit breakers are supported

 Phase-segregated re-trip and three-phases re-trip

 Optional current criterion (phase overcurrent element, zero-sequence overcurrent element, negative-sequence overcurrent element)

 Optional circuit breaker position check

 Two time delays

59P Overvoltage protection

 Up to 2 stages with independent logic

 Optional definite-time characteristic and inverse-time characteristic for each stage

 Optional phase voltage or phase-to-phase voltage

 Optional “1-out-of-3” logic or “3-out-of-3” logic

 Selectable trip purpose or alarm purpose for each stage

1

ANSI Protection Functions Remark

27P Undervoltage protection

 Up to 2 stages with independent logic

 Optional definite-time characteristic and inverse-time characteristic for each stage

 Optional phase voltage or phase-to-phase voltage

 Optional “1-out-of-3” logic or “3-out-of-3” logic

 Blocked by instantaneous VT circuit failure

 Selectable trip purpose or alarm purpose for each stage

59G Residual overvoltage protection

 Up to 2 stages with independent logic

 Optional measured zero-sequence voltage or calculated zero-sequence voltage

 Optional definite-time characteristic and inverse-time characteristic for each stage

 Selectable trip purpose or alarm purpose for each stage

81O Overfrequency protection  Up to 2 stages with independent logic

 Voltage control element 81U Underfrequency protection  Up to 4 stages with independent logic

 Voltage control element

1.3 Control Functions

 Switchgear control

 Double point status synthesis

 Remote/Local control mode switch

 Interlocking logic for control

 Direct control

 Closing synchronism check with voltage selection

 Switchgear trip counter

 Tap position indicator and control

1.4 Measurement and Metering Functions

1

1.5 Supervision Functions

 CT circuit failure supervision (CTS)

 VT circuit failure supervision (VTS)

 Self diagnostic

 Powerful faults recording (max buffer for 10,000 sampled points at 4.8 or 9.6 kHz)

 Event Recorder including 1024 disturbance records, 1024 binary events, 1024 supervision

events, 256 control logs and 1024 device logs

 Disturbance recorder including 64 disturbance records with waveforms (The file format of

disturbance recorder is compatible with international COMTRADE file.)

 Single line diagram representation in display

1.6 Communication Functions

 Support of various protocols

Modbus, DNP3.0, IEC 60870-5-103, IEC 61850 Ed.1 & Ed.2, IEC 61850 MMS Server, IEC

61850-8-1 GOOSE, IEC 61850-9-2LE SV, IEC 62439 Parallel Redundancy Protocol, IEC

62439 HSR Ring Redundancy Protocol

 Up to four 10Base-T/100Base-TX copper Ethernet ports

 Up to fourteen 100Base-FX optical Ethernet ports

 Up to four 1000Base-SX optical Ethernet ports

 Two RS-485 serial ports for communication or printer

 One RS-485/TTL serial port for clock synchronization

 Two RJ45 debugging ports (front and rear)

1.7 User Interfaces

 Friendly HMI interface with LCD, easy-to-use keypad aids simple navigation and set-point

adjustment

 Push buttons for open/close, switch for selection between local and remote control, and user's

login and logout authority management

 4 Programmable operator pushbuttons with user-configurable labels

 Up to 18 programmable target LEDs with user-configurable labels

 1 RS-232 or RS-485 rear ports for printer

 Language switchover—English+ selected language

 Configuration tool—PCS-Studio

1

1.8 Additional Functions

 User programmable logic

 Switching system phase sequences function (ABC or ACB)

 Clock synchronization

 IRIG-B: IRIG-B via RS-485 differential level, TTL level or optical fibre interface

 PPS: Pulse per second (PPS) via RS-485 differential level or binary input

 PPM: Pulse per minute (PPM) via RS-485 differential level or binary input

 IEEE 1588: Clock message based on IEEE 1588 via optical fibre interface

 SNTP (PTP): Unicast (point-to-point) SNTP mode via Ethernet network

 SNTP (BC): Broadcast SNTP mode via Ethernet network

 Message (IEC103/Modbus/DNP3.0): Clock messages through IEC103 protocol, Modbus protocol and DNP3.0 protocol

 Up to 36 analog inputs can be provided and configured flexibly

 The tripping output contacts can be configured by tripping matrix, which is flexible, convenient and suitable to any mode of tripping

 The relay supports at most 6 branches differential protection The transformer angle can be adjusted flexibly, and any transformer angle compensation mode is supported and any side can be chosen as the reference side of differential protection

 Reliable differential CT circuit failure supervision The relay can detect multi-phase CT wire-break, multi-side CT wire-break, short-circuit, and other complex situation The corresponding logic setting can be used to select blocking differential protection or not, in case

of CT circuit failure

 Multiple inrush current blocking options are provided Self-adaptive inrush current blocking

1

criterion can ensure the relay fast operation for transformer energized on to a slight fault,

meanwhile it will avoid the unwanted operation in the case of the energization inrush current

caused by energizing transformer with no load, the recovery inrush current caused by cutting

off the transformer external fault, and the sympathetic inrush current

 Biased DPFC differential protection is regardless of load current and is sensitive to small

internal fault current within the transformer Its anti CT saturation performance is also strong

2

2.9 Measurement Scope and Accuracy 2-13 2.10 Management Function 2-13

2.10.1 Control Performance 2-13 2.10.2 Clock Performance 2-13 2.10.3 Fault and Disturbance Recording 2-14 2.10.4 Binary Input Signal 2-14

2.11 Protective Functions 2-14

2.11.1 Transformer Current Differential Protection (87T) 2-14 2.11.2 Restricted Earth Fault Protection (64REF) 2-15 2.11.3 Winding Differential Protection (87W) 2-15 2.11.4 Reactor Differential Protection (87R) 2-16 2.11.5 Inter-turn Fault Protection (21IT) 2-16 2.11.6 Overexcitation Protection (24) 2-16 2.11.7 Phase Overcurrent Protection (50/51P, 67P) 2-17 2.11.8 Earth Fault Overcurrent Protection (50/51G, 67G) 2-17 2.11.9 Negative-sequence Overcurrent Protection (50/51Q, 67Q) 2-18 2.11.10 Thermal Overload Protection (49) 2-19 2.11.11 Breaker Failure Protection (50BF) 2-19 2.11.12 Overvoltage Protection (59P) 2-19 2.11.13 Residual Overvoltage Protection (59G) 2-20 2.11.14 Undervoltage Protection (27P) 2-20 2.11.15 Overfrequency Protection (81O) 2-20 2.11.16 Underfrequency Protection (81U) 2-20

2.12 Communication Functions 2-21

2.12.1 GOOSE 2-21 2.12.2 SV 2-21

2

2.1 Electrical Specifications

“System phase sequence”, which can be set by PCS-Studio, this setting

informs the device of the actual system phase sequence, either ABC or ACB CT and VT inputs on the device, labeled as A, B and C, must be connected to system phase A, B and C for correct operation

Number Up to 24 (6U, 1/2 × 19") or 36 (6U, 1/1 × 19") AC current inputs

600V 660V

Phase-to-phase 519V

1038V 1141V

Permissible AC ripple voltage ≤15% of the nominal auxiliary voltage

Quiescent condition Max 1W

Additional for each contact

0.004W @24Vdc 0.008W @48Vdc 0.015W @110Vdc 0.32W @220Vdc 0.41W @250Vdc

Additional for each plug-in binary output (BO) module

Quiescent condition Max 0.1W Additional for each relay while

operating

Max 0.44W

Additional for each plug-in

SV sampling (NET-DSP) module

Number Up to 8 (ring ferrule) or 12 (pin ferrule) channels of DC analogue inputs,

all of the channels can be set as 0~±20mA or 0~±10Vdc

2

2.1.5 Binary Input

Settable pickup voltage and dropout voltage

On value (default set) 69.3~132Vdc 78.75~160Vdc 138.6~264Vdc 157.5~300Vdc

Off value (default set) <55Vdc <62.5Vdc <110Vdc <125Vdc

Maximum permissible voltage 300Vdc

Withstand voltage 2000Vac, 2800Vdc (1min)

Number

Up to 84 (6U, 1/2 × 19", ring ferrule), 105 (6U, 1/2 × 19", pin ferrule), 234 (6U, 1/1 × 19", ring ferrule), or 297 (6U, 1/1 × 19", pin ferrule) binary inputs

Settable pickup voltage and dropout voltage

Maximum permissible voltage 300Vac

Withstand voltage 2000Vac, 2800Vdc (1min)

Number

Up to 84 (6U, 1/2 × 19", ring ferrule), 105 (6U, 1/2 × 19", pin ferrule), 234 (6U, 1/1 × 19", ring ferrule), or 297 (6U, 1/1 × 19", pin ferrule) binary inputs

Settable pickup voltage and dropout voltage

Maximum permissible voltage 300Vdc

Withstand voltage 2000Vac, 2800Vdc (1min)

Number Up to 84 (6U, 1/2 × 19", ring ferrule), 105 (6U, 1/2 × 19", pin ferrule), 234

(6U, 1/1 × 19", ring ferrule), or 297 (6U, 1/1 × 19", pin ferrule) binary

Maximum permissible voltage 121Vdc

Withstand voltage 2000Vac, 2800Vdc (1 min)

Number Up to 5 (6U, 1/2 × 19", pin ferrule) or 15 (6U, 1/1 × 19", pin ferrule) MR

Maximum permissible voltage 137.5Vdc

Withstand voltage 2000Vac, 2800Vdc (1 min)

Maximum permissible voltage 242Vdc

Withstand voltage 2000Vac, 2800Vdc (1 min)

Number

Up to 5 (6U, 1/2 × 19", pin ferrule) or 15 (6U, 1/1 × 19", pin ferrule) MR inputs

2

2.1.6 Binary Output

Tripping/signaling contact

Pickup time (Typical value) <5ms

Dropout time (Resistive load) <6ms

Breaking capacity (L/R=40ms)

0.5A@48Vdc 0.35A@110Vdc 0.30A@125Vdc 0.20A@220Vdc 0.15A@250Vdc

Cyclic Capacity (2.5 cycle/second,

L/R=40ms)

0.5A@48Vdc 0.35A@110Vdc 0.30A@125Vdc 0.20A@220Vdc 0.15A@250Vdc

Short duration current

30A@3s 50A@1s Durability (Loaded contact) 10000 operations

Number

Up to 44 (6U, 1/2 × 19", ring ferrule), 56 (6U, 1/2 × 19", pin ferrule), 122 (6U, 1/1 × 19", ring ferrule), or 158 (6U, 1/1 × 19", pin ferrule) tripping/signal contacts

Heavy-capacity tripping contact

MOV Protection (Max voltage ) 350Vdc, 275Vac

Pickup time (Typical value) <1ms

Dropout time (Resistive load) <10ms

2

Breaking capacity (L/R=40ms)

10A@48V 10A@110V 10A@125V 10A@250V

Cyclic Capacity (4 cycle/second,

followed by 2 minutes idle for thermal

dissipation)

10A@48V L/R=40ms 10A@110V L/R=40ms 10A@125V L/R=40ms 10A@250V L/R=20ms

Short duration current

30A@3s 50A@1s Durability (Loaded contact) 10000 operations

Number

Up to 12 (6U, 1/2 × 19", ring ferrule), or 36 (6U, 1/1 × 19", ring ferrule) heavy-capacity tripping contacts

MR (Mechanical Relay) contact

Pickup time (Typical value) <10ms

Dropout time (Resistive load) <10ms

Breaking capacity (L/R=40ms)

1.00A@48Vdc 0.50A@110Vdc 0.40A@125Vdc 0.25A@220Vdc 0.20A@250Vdc

Short duration current

12A@3s 15A@1s 20A@0.5s 30A@0.2s

2

Durability (Loaded contact) 10000 operations

Number Up to 15 (6U, 1/2 × 19", pin ferrule) or 45 (6U, 1/1 × 19", pin ferrule) MR

outputs

2.2 Mechanical Specifications

Weight per device

Approx 8.66kg (6U, 1/2 × 19") Approx 15.27kg (6U, 1/1 × 19")

Location of terminal Rear panel of the device

Device structure Plug-in modular type @ rear side, integrated front plate

Protection Class

Front side

IP52 IP54 (valid for surface mounting mode of 6U 19" × 1/2 case with sealing strip)

Rear side, connection terminals IP20

2.3 Ambient Temperature and Humidity Range

2

2.4 Communication Port

2.4.1 EIA-485 Port

Baud rate 4.8kbit/s, 9.6kbit/s, 19.2kbit/s, 38.4kbit/s, 57.6kbit/s, 115.2kbit/s

Transmission distance Max 500m

2.4.2 Copper Ethernet Por

Transmission standard 100Base-TX

2.4.3 Optical Ethernet Port

Transmission standard 100Base-FX

Transmission distance Max 2km

2

Transmission standard 1000Base-SX

Transmission distance

Max 500m (50/125μm) Max 300m (62.5/125μm)

2.4.4 Print Port

Baud rate 4.8kbit/s, 9.6kbit/s, 19.2kbit/s, 38.4kbit/s, 57.6kbit/s, 115.2kbit/s

2.4.5 Clock Synchronization Port

Damp heat test, cyclic IEC60068-2-30:2005

2.5.2 Mechanical Tests

Shock and bump IEC 60255-21-2:1988 Class Ⅰ

2

2.5.3 Electrical Tests

Dielectric tests Test voltage 2kV, 50Hz, 1min

Impulse voltage tests Test voltage 5kV

Electrostatic discharge test

IEC 61000-4-2-2008 class Ⅳ For contact discharge: 8kV For air discharge: 15kV

Radio frequency interference tests

IEC 60255-26:2013 class Ⅲ Frequency sweep

Radiated amplitude-modulated 10V/m (rms), f=80~1000MHz, 1400~2700MHz Spot frequency

Radiated amplitude-modulated 10V/m (rms), f=80MHz/160MHz/450MHz/900MHz

Fast transient disturbance tests

IEC 60255-26:2013 Power supply, I/O, Earth: class Ⅳ, 4kV, 5kHz, 5/50ns Communication terminals: class Ⅳ, 2kV, 5kHz, 5/50ns

Surge immunity test

IEC 60255-26:2013 Power supply, AC input, I/O port: class Ⅳ, 1.2/50us Common mode: 4kV

Differential mode: 2kV Conducted RF electromagnetic IEC 60255-26:2013

2

disturbance Power supply, AC, I/O, Comm Terminal: Class Ⅲ , 10V (rms),

150kHz~80MHz Spot frequency 10V (rms), f=27MHz/68MHz Power frequency magnetic field

Immunity

IEC 61000-4-8: 2009 class Ⅴ, 100A/m for 1min, 1000A/m for 3s

Pulse magnetic field immunity

IEC 61000-4-9:2016 class Ⅴ, 6.4/16μs, 1000A/m for 3s Damped oscillatory magnetic field

immunity

IEC 61000-4-10:2016 class Ⅴ, 100kHz & 1MHz–100A/m

Conducted emission

IEC 60255-26:2013 0.15MHz~0.50MHz: 79dB (μV) quasi peak, 66dB (μV) average 0.50MHz~30MHz: 73dB (μV) quasi peak, 60dB (μV) average

Radiated emission

IEC 60255-26:2013

Below 1GHz

30MHz~230MHz: 40dB (μV/m) quasi peak @10m, 50dB (μV/m) quasi peak @3m

230MHz~1000MHz: 47dB (μV/m) quasi peak @10m, 57dB (μV/m) quasi peak @3m

Above 1GHz

1GHz~3GHz: 56dB (μV/m) average, 76dB (μV/m) peak @3m

3GHz~6GHz: 60dB (μV/m) average, 80dB (μV/m) peak @3m

Auxiliary power supply performance

50ms for interruption without rebooting without energy storage board (Typical configuration)

500ms for interruption without rebooting with energy

 EMC: 2014/30/EU, EN60255-26:2013

 Products safety (LVD): 2014/35/EU, EN60255-27:2014

 IEC 61850: Edition 2, Parts 6, 7-1, 7-2, 7-3,7-4 and 8-1

 IEC 61850: Edition 2, GOOSE Performance Class P1 (3ms)

 IEEE 1588: IEEE Std C37.238TM-2017

 DNP: DNP 3.0

 PRP: IEC 62439-3 Ed.3 (IS 2016)

 HSR: IEC 62439-3 Ed.3 (IS 2016)

2.7 Liquid Crystal Display (LCD)

2.8 Terminals

2.8.1 Ring Ferrule

Connection Type Wire Size Screw Type Torque