Introduction - Toshiba GRT100 Series Instruction Manual

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
 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.
4  40 character LCD and keypad
RS232C and RS485 communication ports
 8 
6 F 2 S 0 7 8 9