Product/Technical Services

Frequency/Voltage Protection GRF100

Product Overview

GRF100 is a voltage measuring relay which can be applied for under / over voltage protection, under / over frequency protection and rate-of-change-of-frequency protection.

Technical Description

Protection functions

  1. Frequency and/or voltage protection for load shedding and synchronous machine protection

  2. Four-stage underfrequency and/or overfrequency protection

  3. Four-stage frequency rate-of-change (df/dt) protection (rate of rise and rate of decay)

  4. Undervoltage block for frequency protection

  5. Undervoltage and/or overvoltage protection (definite time and inverse time protection)


Metering and recording functions

  1. Metering
    - Power system voltages, frequency (max. and min.) and frequency rate-of-change (df / dt max.)

  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