Product/Technical Services

Transformer Protection GRT100

Product Overview

GRT100 is a numerical transformer protection relay, which can be applied for two-winding or three-winding power transformers, auto-transformers and generator- transformer units. The main transformer differential protection is supported by restricted earth fault, back-up overcurrent, thermal overload, over-excitation and frequency protections. In addition there are standard GR-series features such as metering, data recording and communications.

Technical Description

Protection functions

  1. Current differential protection for two- or three-winding transformers

  2. High-set differential overcurrent protection

  3. No interposing CTs required

  4. CT ratio and vector group compensation

  5. Restricted earth fault protection

  6. Time-overcurrent protection

  7. Thermal overload protection

  8. Overexcitation protection

  9. Overfrequency and underfrequency protection


Metering and recording functions

  1. Metering
    - Power system voltages, currents, differential currents, frequency

  2. Recording
    - Event record
    - Fault record
    - Disturbance record

  3. Calendar and Time
    - IRIG-B port for external clock

Menu-driven human interfaces

  1. Liquid Crystal Display (LCD) display with operation keys
    - Relay setting and data display

  2. Personal computer (PC) interface
    - Relay setting
    - Recorded data display
    - Waveform analyzing

Automatic supervision

  1. Automatic monitor