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Top Page > Transmission & Distribution > Product/Technical Services > Protection relay > High Impedance Differential Protection GRB150

High Impedance Differential Protection GRB150

Product Overview

GRB150 is a numerical high impedance differential relay and can be applied for :

  1. Restricted earth fault protection

  2. Single, double, or one-and-a-half busbar protection

  3. T-zone protection of one-and-a-half busbar arrangement

  4. Short line cable protection

Technical Description

Protection functions

  1. Busbar protection for single, double and one-and-a-half busbars

  2. Restricted earth fault protection

  3. T-zone protection of one-and-a-half busbar arrangement

  4. Short line cable protection

  5. Secure operation against CT saturation

  6. CT supervision

  7. Single- or three-phase models

ProductsPhoto

Metering and recording functions

  1. Metering
    - Differential voltage

  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

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