Toshiba GRT100 Series User manual

6 F2 S 0 7 8 9
INSTRUCTION MANUAL
TRANSFORMER PROTECTION RELAY
GRT100 - B
© Toshiba Energy Systems & Solutions Corporation 2017
All Rights Reserved.
( Ver. 3.1)

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Safety Precautions
Before using this product, be sure to read this chapter carefully.
This chapter describes safety precautions when using the GRT100. Before installing and using
the equipment, read and understand this chapter thoroughly.
Explanation of symbols used
Signal words such as DANGER, WARNING, and two kinds of CAUTION, will be followed by
important safety information that must be carefully reviewed.
Indicates an imminently hazardous situation which will result in death or
serious injury if you do not follow instructions.
Indicates a potentially hazardous situation which could result in death or
serious injury if you do not follow instructions.
CAUTION Indicates a potentially hazardous situation which if not avoided, may result in
minor injury or moderate injury.
CAUTION Indicates a potentially hazardous situation which if not avoided, may result in
property damage.
DANGER
WARNING

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Current transformer circuit
Never allow the current transformer (CT) secondary circuit connected to this equipment to be
opened while the primary system is live. Opening the CT circuit will produce a dangerous high
voltage.
Exposed terminals
Do not touch the terminals of this equipment while the power is on, as the high voltage generated
is dangerous.
Residual voltage
Hazardous voltage can be present in the DC circuit just after switching off the DC power supply.
It takes about 30 seconds for the voltage to discharge.
CAUTION
Earth
Earth the earthing terminal of the equipment securely.
CAUTION
Operation conditions
Use the equipment within the range of ambient temperature, humidity and dust as detailed in the
specification and in an environment free of abnormal vibration.
Ratings
Before applying AC voltage and current or DC power supply to the equipment, check that they
conform to the equipment ratings.
Printed circuit board
Do not attach and remove the printed circuit board while the DC power to the equipment is on, as
this may cause the equipment to malfunction.
Battery
Avoid placing the back side of the printed circuit board with a battery (SPM board) directly on
top of a metal conductor or wrapping it with metal foil, as this may short-circuit the battery power
supply. However, the board may be placed on an antistatic conductive mat.
External circuit
When connecting the output contacts of the equipment to an external circuit, carefully check the
supply voltage used and prevent the connected circuit from overheating.
Connection cable
Carefully handle the connection cable without applying excessive force.
Modification
Do not modify this equipment, as this may cause the equipment to malfunction, and any such
modifications will invalidate the warranty.
DANGER
WARNING

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Disposal
When disposing of this product, do so in a safe manner according to local regulations.
This product contains a lithium-ion battery, which should be removed at the end-of-life of the
product. The nominal backup time of a lithium-ion battery is one year after the shipment from the
factory. The battery must be recycled or disposed of in accordance with local regulations. The
battery can be removed by withdrawing the Signal Processing module (SPM) from the relay case,
and cutting the connecting leads and plastic strap which hold the battery.

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Contents
Safety Precautions 1
1. Introduction 8
2. Application Notes 9
2.1 Application 9
2.2 Protection Scheme 10
2.3 Current Differential Protection 12
2.3.1 Differential Scheme 12
2.3.2 Matching of CT Secondary Currents 14
2.3.3 Connection between CT Secondary Circuit and the GRT100 15
2.3.4 Setting 16
2.4 Restricted Earth Fault Protection 22
2.5 Overcurrent Protection 26
2.6 Thermal Overload Protection 31
2.7 Frequency Protection 32
2.8 Overexcitation Protection 34
2.9 Trip by External Devices 36
2.10 Tripping Output 37
2.11 Characteristics of Measuring Elements 38
2.11.1 Percentage Current Differential Element DIF 38
2.11.2 High-set Overcurrent Element HOC 39
2.11.3 Restricted Earth Fault Element REF 39
2.11.4 Inverse Time Overcurrent Element OCI and EFI 40
2.11.5 Definite Time Overcurrent element OC and EF 41
2.11.6 Thermal Overload Element THR 42
2.11.7 Frequency Element FRQ 44
2.11.8 Overexcitation Element V/F 44
3. Technical Description 45
3.1 Hardware Description 45
3.1.1 Outline of Hardware Modules 45
3.1.2 Transformer Module 48
3.1.3 Signal Processing Module 49
3.1.4 Binary Input and Output Module 50
3.1.5 Human Machine Interface (HMI) Module 53
3.2 Input and Output Signals 55
3.2.1 Input Signals 55
3.2.2 Binary Output Signals 56
3.2.3 PLC (Programmable Logic Controller) Function 57
3.3 Automatic Supervision 58
3.3.1 Basic Concept of Supervision 58
3.3.2 Relay Monitoring and Testing 58

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3.3.3 Failure Alarms 59
3.3.4 Trip Blocking 59
3.3.5 Setting 60
3.4 Recording Function 61
3.4.1 Fault Recording 61
3.4.2 Event Recording 62
3.4.3 Disturbance Recording 63
3.5 Metering Function 65
4. User Interface 66
4.1 Outline of User Interface 66
4.1.1 Front Panel 66
4.1.2 Communication Ports 68
4.2 Operation of the User Interface 69
4.2.1 LCD and LED Displays 69
4.2.2 Relay Menu 71
4.2.3 Displaying Records 74
4.2.4 Displaying the Status 77
4.2.5 Viewing the Settings 82
4.2.6 Changing the Settings 82
4.2.7 Testing 98
4.3 Personal Computer Interface 102
4.4 Relay Setting and Monitoring System 102
4.5 IEC 60870-5-103 Interface 103
4.6 Modbus Interface 103
4.7 Clock Function 103
5. Installation 105
5.1 Receipt of Relays 105
5.2 Relay Mounting 105
5.3 Electrostatic Discharge 105
5.4 Handling Precautions 105
5.5 External Connections 106
6. Commissioning and Maintenance 107
6.1 Outline of Commissioning Tests 107
6.2 Cautions 108
6.2.1 Safety Precautions 108
6.2.2 Cautions on Tests 108
6.3 Preparations 109
6.4 Hardware Tests 110
6.4.1 User Interfaces 110
6.4.2 Binary Input Circuit 111
6.4.3 Binary Output Circuit 112
6.4.4 AC Input Circuits 113
6.5 Function Test 114

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6.5.1 Measuring Element 114
6.5.2 Timer Test 130
6.5.3 Protection Scheme 132
6.5.4 Metering and Recording 132
6.6 Conjunctive Tests 133
6.6.1 On Load Test 133
6.6.2 Tripping Circuit Test 133
6.7 Maintenance 135
6.7.1 Regular Testing 135
6.7.2 Failure Tracing and Repair 135
6.7.3 Replacing Failed Modules 137
6.7.4 Resumption of Service 139
6.7.5 Storage 139
7. Putting Relay into Service 140

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Appendix A Block Diagram 141
Appendix B Signal List 143
Appendix C Variable Timer List 159
Appendix D Binary Output Default Setting List 161
Appendix E Details of Relay Menu and LCD & Button Operation 165
Appendix F Case Outline 173
Appendix G External Connections 179
Appendix H Relay Setting Sheet 185
Appendix I Commissioning Test Sheet (sample) 194
Appendix J Return Repair Form 200
Appendix K Technical Data 206
Appendix L Setting of REF Element 212
Appendix M Symbols Used in Scheme Logic 220
Appendix N Implementation of Thermal Model to IEC60255-8 224
Appendix O IEC60870-5-103: Interoperability and Troubleshooting 228
Appendix P Modbus: Interoperability and Troubleshooting 240
Appendix Q Inverse Time Characteristics 255
Appendix R Failed Module Tracing and Replacement 259
Appendix S Ordering 265
The data given in this manual are subject to change without notice. (Ver. 3.1)

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1. Introduction
The GRT100 provides transformer protection for two- or three- winding power transformers
connected to single, double or a one-and-a-half busbar system.
The GRT100 is member of the G-series numerical relays which are built on common hardware
modules and featured with the following functions:
Human interfaces on the relay front panel, and local and remote PCs
4 40 character LCD and keypad
RS232C and RS485 communication ports
Meeting and recording of event, fault and disturbance
IRIG-B time synchronization
Automatic supervision
User configurable binary output
GRT100 has two model series which differ according to the number of three-phase current inputs
for differential protection as follows:
Relay Type and Model
Relay Type:
- Type GRT100; Numerical transformer protection relay
Relay Model:
- Model 100 series; 2 three-phase current inputs, applied to two-winding transformers
Model 101; 13 N/O programmable output contacts
Model 102; 23 N/O programmable output contacts
- Model 200 series; 3 three-phase current inputs, applied to two- and three-winding transformers
Model 201; 13 N/O programmable output contacts
Model 202; 23 N/O programmable output contacts
Model 100 series have 2 three-phase current inputs and can be applied to two-winding
transformers. Model 200 series have 3 three-phase current inputs and can be applied to two- and
three-winding transformers.

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2. Application Notes
2.1 Application
The GRT100 provides high-speed transformer and reactor protection, and realises high
dependability and security for diverse faults such as single-phase faults, multi-phase faults,
overload and over-excitation.
The GRT100 is used as a main protection and backup protection of the following transformers
and reactors.
Two-winding or three-winding power transformers
Auto-transformers
Generator-transformer units
Shunt reactors
The GRT100 provides the stabilization for magnetizing inrush and overexcitation.
GRT100 provides the following metering and recording functions.
Metering
Fault records
Event records
Disturbance records
GRT100 provides the following human interfaces for relay setting or viewing of stored data.
Relay front panel: LCD, LED display and operation keys
Local PC
Remote PC
The relay can be integrated with a local PC or a remote PC through a communication port.
A local PC can be connected via the RS232C port on the front panel of the relay. A remote PC
can also be connected through the RS485 port on the rear panel of the relay.