6 F 2 T 0 1 7 2
1. Introduction
GRE110 series relays provide non-directional overcurrent protection for radial distribution
Medium Voltage class networks, and back-up protection for distribution networks.
Note: GRE110 series relays are non-directional, and are applicable to systems where fault current
flows in a fixed direction, or flows in both directions but there is a significant difference in
magnitude. In systems where a fault current flows in both directions and there is not a significant
difference in the magnitude of the fault current, the
directional
overcurrent protection provided
by GRE140 facilitates fault selectivity.
The GRE110 series provides the following protection schemes in all models.
•
Overcurrent protection for phase and earth faults with definite time or inverse time
characteristics
•
Instantaneous overcurrent protection for phase and earth faults
The GRE110 series provides the sensitive earth fault protection scheme depending on the models.
The GRE110 series provides the following functions for all models.
•
Two settings groups
•
Configurable binary inputs and outputs
•
Circuit breaker control and condition monitoring
•
Trip circuit supervision
•
Autoreclosing function
•
Automatic self-supervision
•
Menu-based HMI system
•
Configurable LED indication
•
Metering and recording functions
•
Front mounted USB port for local PC communications
•
Rear mounted RS485 serial ports for communications
Table 1.1.1 shows the members of the GRE110 series and identifies the functions to be provided by
each member.
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Summary of Contents for GRE110
Page 183: ...6 F 2 T 0 1 7 2 Appendix B Signal List 184 ...
Page 191: ...6 F 2 T 0 1 7 2 Appendix C Event Record Items 192 ...
Page 196: ...6 F 2 T 0 1 7 2 Appendix D Binary Output Default Setting List 197 ...
Page 199: ...6 F 2 T 0 1 7 2 Appendix E Relay Menu Tree 200 ...
Page 210: ...6 F 2 T 0 1 7 2 Appendix F Case Outline 211 ...
Page 211: ...6 F 2 T 0 1 7 2 Case Outline for model 400 401 420 421 820 and 821 212 ...
Page 212: ...6 F 2 T 0 1 7 2 Case Outline for model 402 and 422 213 ...
Page 213: ...6 F 2 T 0 1 7 2 Appendix G Typical External Connection 214 ...
Page 245: ...6 F 2 T 0 1 7 2 Appendix J Return Repair Form 246 ...
Page 249: ...6 F 2 T 0 1 7 2 Customer Name Company Name Address Telephone No Facsimile No Signature 250 ...
Page 250: ...6 F 2 T 0 1 7 2 Appendix K Technical Data 251 ...
Page 256: ...6 F 2 T 0 1 7 2 Appendix L Symbols Used in Scheme Logic 257 ...
Page 259: ...6 F 2 T 0 1 7 2 Appendix M Modbus Interoperability 260 ...
Page 289: ...6 F 2 T 0 1 7 2 Appendix N IEC60870 5 103 Interoperability 290 ...
Page 296: ...6 F 2 T 0 1 7 2 Appendix O PLC Default setting 297 ...
Page 298: ...6 F 2 T 0 1 7 2 Appendix P Inverse Time Characteristics 299 ...
Page 304: ...6 F 2 T 0 1 7 2 Appendix Q IEC61850 Interoperability 305 ...