Toshiba GRE110 - User Manual

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INSTRUCTION MANUAL
OVERCURRENT PROTECTION RELAY
GRE110
© TOSHIBA Corporation 2013
All Rights Reserved.
( Ver. 5.3)

Summary

Safety Precautions

Explanation of symbols used

Explains the meaning of signal words like DANGER, WARNING, and CAUTION used in the manual.

2. Application Notes

2.1 Phase Overcurrent and Residual Overcurrent Protection

Details phase and residual overcurrent protection methods for radial distribution networks.

2.2 Instantaneous and Staged Definite Time Overcurrent Protection

Discusses instantaneous and staged definite time overcurrent protection in conjunction with inverse time protection.

2.3 Sensitive Earth Fault Protection

Covers sensitive earth fault protection for high impedance earthed systems and its applications.

2.5 Thermal Overload Protection

Describes thermal overload protection simulating changing thermal state using a thermal model.

2.6 Negative Sequence Overcurrent Protection

Details negative sequence overcurrent protection for asymmetrical faults and load unbalance.

2.8 Breaker Failure Protection

Covers breaker failure protection that clears faults by backtripping adjacent circuit breakers.

2.9 Countermeasures for Magnetising Inrush

Outlines schemes to prevent incorrect operation from magnetizing inrush current during transformer energization.

3. Technical Description

3.3 Automatic Supervision

Describes the automatic supervision function for checking the health of the protection system.

4. User Interface

4.2 Operation of the User Interface

Explains how to access functions like recording, measurement, and setting via LCD and keys.

4.2.6 Changing the Settings

4.2.6.1 Setting Method

4.2.6.2 Password

Details how to set, change, or cancel the password protection for settings.

4.2.6.4 Communication

Explains setting relay address and baud rate for Modbus or optional communication.

4.2.7 Control

4.2.7.1 Local; Remote Control

4.2.7.2 CB close; open Control

4.2.7.3 Password

Details setting the password protection for control functions.

4.2.8 Testing

4.2.8.1 Scheme Switch

Explains how to disable the automatic monitor function (AMF) for testing.

4.2.8.2 Binary Output Relay

4.2.8.3 Password

Details setting the password protection for testing functions.

4.3 Personal Computer Interface

4.4 MODBUS Interface

4.5 IEC 60870-5-103 Interface

4.6 IEC 61850 Communication

5. Installation

5.2 Relay Mounting

5.3 Electrostatic Discharge

Warns about the sensitivity of electronic components to electrostatic discharge and handling precautions.

5.4 Handling Precautions

Explains how normal movements can generate static potentials and cause damage to devices.

6. Commissioning and Maintenance

6.1 Outline of Commissioning Tests

Describes commissioning tests including hardware, function, and conjunctive tests.

6.2 Cautions

Provides safety precautions related to connecting cables and removing terminal blocks or power.

6.4 Hardware Tests

6.5 Function Test

6.7 Maintenance

7. Putting Relay into Service

Appendix A

Programmable Reset Characteristics

Implementation of Thermal Model to IEC60255-149

Details the thermal model used for overload protection, simulating changing thermal states using exponential time constants.

Appendix K

Ratings

Overload Ratings

Current Transformer Requirements

Phase Overcurrent Protection (50, 51)

Specifies thresholds, delay types, TMS, reset types, and DTL delays for OC elements.

Earth Fault Protection (50 N, 51 N)

Details thresholds, delay types, TMS, reset types, and DTL delays for EF elements.

Sensitive Earth Fault Protection (50 Ns, 51 Ns)

Covers thresholds, delay types, TMS, reset types, and DTL delays for SEF elements.

Thermal Overload Protection (49)

Details thermal overload settings, time constant, and alarm settings.

Negative Sequence Overcurrent Protection (46)

CBF Protection (50 BF)

Details CBF thresholds and DTL delays for breaker failure protection.

Inrush Current Detector

Specifies settings for second harmonic ratio and overcurrent thresholds for inrush detection.

Appendix N

3. IEC60870-5-103 Interface

Appendix P

IEC;UK Inverse Curves (NI)

IEC;UK Inverse Curves (VI)

IEC;UK Inverse Curves (EI)

UK Inverse Curves (LTI)

IEEE Inverse Curves (MI)

IEEE Inverse Curves (VI)

IEEE Inverse Curves (EI)

US Inverse Curves (CO8)

US Inverse Curves (CO2)

Appendix Q

1. IEC 61850 Documentation

IEC61850 Model Implementation Conformance Statement (MICS) for GRE110

Lists supported IEC 61850 logical nodes and common data classes for the GRE110 relay.

Toshiba GRE110 Specifications