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INSTRUCTION MANUAL
DIRECTIONAL OVERCURRENT PROTECTION RELAY
GRD140
© TOSHIBA Corporation 2004
All Rights Reserved.
( Ver.0.5)
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Safety Precautions
Before using this product, please read this chapter carefully.
This chapter describes the safety precautions recommended when using the GRD140. Before
installing and using the equipment, this chapter must be thoroughly read and understood.
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.
DANGER
WARNING
CAUTION
CAUTION
Indicates an imminently hazardous situation which will result in death or
serious injury if you do not follow the instructions.
Indicates a potentially hazardous situation which could result in death or
serious injury if you do not follow the instructions.
Indicates a potentially hazardous situation which if not avoided, may result in
minor injury or moderate injury.
Indicates a potentially hazardous situation which if not avoided, may result in
property damage.
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DANGER
•
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 dangerously high
voltage.
WARNING
•
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 approximately 30 seconds for the voltage to discharge.
•
Fiber optic
When connecting this equipment via an optical fiber, do not look directly at the optical signal.
CAUTION
•
Earth
The earthing terminal of the equipment must be securely earthed.
CAUTION
•
Operating environment
The equipment must only used within the range of ambient temperature, humidity and dust
detailed in the specification and in an environment free of abnormal vibration.
•
Ratings
Before applying AC voltage and current or the DC power supply to the equipment, check that they
conform to the equipment ratings.
•
Printed circuit board
Do not attach and remove printed circuit boards when the DC power to the equipment is on, as this
may cause the equipment to malfunction.
•
External circuit
When connecting the output contacts of the equipment to an external circuit, carefully check the
supply voltage used in order to prevent the connected circuit from overheating.
•
Connection cable
Carefully handle the connection cable without applying excessive force.
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•
Modification
Do not modify this equipment, as this may cause the equipment to malfunction.
•
Disposal
When disposing of this equipment, do so in a safe manner according to local regulations.
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Contents
Safety Precautions
1.
2.
Introduction
Application Notes
2.1
Overcurrent and Undercurrent Protection
2.1.1 Non-directional Overcurrent Protection
2.1.2 Directional Overcurrent Protection
2.1.3 Scheme Logic
2.1.4 Phase Undercurrent Protection
2.1.5 Thermal Overload Protection
2.1.6 Broken Conductor Protection
2.1.7 Breaker Failure Protection
2.1.8 Cold Load Protection
2.1.9 CT Requirements
Overvoltage and Undervoltage Protection
2.2.1 Phase Overvoltage Protection
2.2.2 Phase Undervoltage Protection
2.2.3 Zero Phase Sequence Overvoltage Protection
2.2.4 Negative Phase Sequence Overvoltage Protection
Frequency Protection
Trip and Alarm Signal Output
Autoreclose
2.5.1 Scheme Logic
2.5.2 Sequence Coordination
2.5.3 Setting
Hardware Description
3.1.1 Outline of Hardware Modules
Input and Output Signals
3.2.1 AC Input Signals
3.2.2 Binary Input, Output Signals
3.2.3 Binary Output Signals
Automatic Supervision
3.3.1 Basic Concept of Supervision
3.3.2 Relay Monitoring
3.3.3 CT Failure Supervision
3.3.4 VT Failure Supervision
3.3.5 Trip Circuit Supervision
3.3.6 Circuit Breaker Monitoring
3.3.7 Failure Alarms
3.3.8 Trip Blocking
3.3.9 Setting
1
8
10
10
10
17
21
44
46
49
52
55
58
60
60
63
66
69
71
73
75
75
76
77
78
78
78
82
82
82
86
87
87
87
88
89
90
91
92
93
94
2.2
2.3
2.4
2.5
3.
Technical Description
3.1
3.2
3.3
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3.4
Recording Function
3.4.1 Fault Recording
3.4.2 Event Recording
3.4.3 Disturbance Recording
Metering Function
Fault locator
3.6.1 Application
3.6.2 Distance to Fault Calculation
3.6.3 Starting Calculation
3.6.4 Displaying Location
3.6.5 Setting
Outline of User Interface
4.1.1 Front Panel
4.1.2 Communication Ports
Operation of the User Interface
4.2.1 LCD and LED Displays
4.2.2 Relay Menu
4.2.3 Displaying Records
4.2.4 Displaying the Status
4.2.5 Viewing the Settings
4.2.6 Changing the Settings
4.2.7 Testing
Personal Computer Interface
Relay Setting and Monitoring System
IEC 60870-5-103 Interface
Clock Function
Receipt of Relays
Relay Mounting
Electrostatic Discharge
Handling Precautions
External Connections
Outline of Commissioning Tests
Cautions
6.2.1 Safety Precautions
6.2.2 Cautions on Tests
Preparations
Hardware Tests
6.4.1 User Interfaces
6.4.2 Binary Input Circuit
6.4.3 Binary Output Circuit
6.4.4 AC Input Circuits
95
95
96
97
99
101
101
101
102
102
103
104
104
104
106
107
107
110
113
118
124
125
168
171
171
172
172
173
173
173
173
173
174
175
175
176
176
176
177
178
178
178
179
180
3.5
3.6
4.
User Interface
4.1
4.2
4.3
4.4
4.5
4.6
5.
5.1
5.2
5.3
5.4
5.5
6.
6.1
6.2
Installation
Commissioning and Maintenance
6.3
6.4
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6.5
Function Test
6.5.1 Measuring Element
6.5.2 Protection Scheme
6.5.3 Metering and Recording
Conjunctive Tests
6.6.1 On Load Test
6.6.2 Tripping and Reclosing Circuit Test
Maintenance
6.7.1 Regular Testing
6.7.2 Failure Tracing and Repair
6.7.3 Replacing Failed Relay Unit
6.7.4 Resumption of Service
6.7.5 Storage
182
182
193
193
194
194
195
197
197
197
198
199
199
200
6.6
6.7
7.
Putting Relay into Service
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Appendix A Programmable Reset Characteristics and Implementation of Thermal
Model to IEC60255-8
Appendix B Directional Earth Fault Protection and Power System Earthing
Appendix C Signal List
Appendix D Event Record Items
Appendix E Details of Relay Menu and LCD & Button Operation
Appendix F Case Outline
Appendix G Typical External Connection
Appendix H Relay Setting Sheet
Appendix I
Commissioning Test Sheet (sample)
201
205
211
219
223
239
241
247
261
265
269
277
281
289
295
Appendix J Return Repair Form
Appendix K Technical Data
Appendix L Symbols Used in Scheme Logic
Appendix M IEC60870-5-103: Interoperability
Appendix N Inverse Time Characteristics
Appendix O Ordering
The data given in this manual are subject to change without notice. (Ver.0.5)
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1. Introduction
GRD140 series relays provide four stage non-directional and directional overcurrent protection
for distribution networks, and back-up protection for transmission and distribution networks.
The GRD140 series has three models and provides the following protection schemes in all models.
• Directional overcurrent protection and directional zero phase sequence overcurrent
protection for earth fault with definite time or inverse time characteristics
• Instantaneous directional overcurrent protection and instantaneous directional zero phase
sequence overcurrent protection for earth fault
Model 110 provides directional earth fault protection and directional sensitive earth fault
protection.
Model 400 provides three-phase directional phase fault protection and directional earth fault
protection.
Model 420 provides three-phase directional phase fault protection, and directional earth and
sensitive earth fault protection.
All models include multiple, high accuracy, overcurrent protection elements (for phase and/or
earth fault) with inverse time and definite time delay functions. All phase, earth and sensitive earth
fault overcurrent elements can be independently subject to directional control.
In addition, GRD140 provides multi-shot, three phase auto-reclose, with independent sequences
for phase fault, and earth fault and sensitive earth fault. Auto-reclosing can also be triggered by
external protection devices.
Other protection functions are available according to model type, including thermal protection to
IEC60255-8, negative sequence overcurrent protection, under/overvoltage and
under/overfrequency protections. See Table 1.1.1 for details of the protection functions available
in each model.
All models provide continuous monitoring of internal circuits and of software. External circuits
are also monitored, by trip circuit supervision, CT and VT supervision, and CB condition
monitoring features.
A user-friendly HMI is provided through a backlit LCD, programmable LEDs, keypad and
menu-based operating system. PC access is also provided, either for local connection via a
front-mounted RS232 port, or for remote connection via a rear-mounted RS485 or fibre optic port.
The communication system allows the user to read and modify the relay settings, and to access
data gathered by the relay’s metering and recording functions.
Data available either via the relay HMI or communications ports includes the following functions.
The GRD140 series provides the following functions for all models.
• Metering
• Fault recording
• Event recording
• Disturbance recording (available via communications ports)
Table 1.1.1 shows the members of the GRD140 series and identifies the functions to be provided
by each member.
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Table 1.1.1 Series Members and Functions
Model Number
GRD140 -
110
Directional Phase Fault O/C OC1 – OC4 (67/50P, 67/51P)
Directional Earth Fault O/C EF1 – EF4 (67/50N, 67/51N)
Directional Sensitive Earth Fault SEF1 – SEF4(67/50N, 67/51N)
Phase Undercurrent UC1, UC2 (37P)
Thermal Overload THM (49)
Directional Negative Phase Sequence Overcurrent NOC1, NOC2 (67/46)
Phase Overvoltage OV1, OV2 (59)
Phase Undervoltage UV1, UV2 (27)
Zero Phase Se
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