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1. Introduction
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.
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
GRT100 is designed to provide stability under magnetizing inrush and overexcitation conditions.
GRT100 is available for mixed 1A/5A inputs
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
Password protection is provided to change settings. Eight active setting groups are provided. This
allows the user to set one group for normal operating conditions while other groups may be set to
cover alternative operating conditions by binary input using the PLC.
GRT100 can provide the following serial interface ports:
- RS232C for a local PC and Relay Setting and Monitoring System (RSM100)
- RS485 for a remote PC, and Relay Setting and Monitoring System (RSM100) or Substation
control and Automation System (SAS) with IEC60870-5-103 protocol
- Fibre Optic (FO, option) for a remote PC, and Relay Setting and Monitoring System
(RSM100) or Substation control and Automation System (SAS) with IEC60870-5-103
protocol
- 100BASE-TX, or -FX (option) for Substation control and Automation System (SAS) with
IEC61850 protocol
Another interface IRIG-B port is provided for an external clock connection.
The RS232C port is located on the front panel of the relay. Other ports (RS485, FO, 100BASE-TX
and IRIG-B) are located on the rear of the relay.
Further, the GRT100 provides the following functions.