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Toshiba Energy Systems & Solutions Corporation

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Transformer Protection IED GRT200

Product Overview

The GRT200 transformer protection IED has been designed to provide complete protection for two-winding or three-winding power transformers, auto-transformers and generator-transformers, within the flexible and user-friendly GR-200 Series platform. Up to five current inputs can be provided for the phase-segregated differential protection. The main transformer differential protection is supported by restricted earth fault, backup overcurrent, thermal overload, over-excitation and frequency protections.

Technical Description

Protection functions

  1. Current differential protection for two- or three-winding transformers incorporating stability against inrush, over-excitation and CT saturation

  2. Inrush current detection

  3. Mixed 1A/5A inputs for phase and neutral currents

  4. CT ratio, vector and zero-sequence compensation

  5. Restricted earth fault protection incorporating enhanced stability against CT saturation

  6. Circuit breaker failure protection

  7. Non-directional overcurrent protection for phase faults

  8. Non-directional overcurrent protection for earth faults using neutral current

  9. Directional / non-directional overcurrent protection for earth faults using phase currents

  10. Negative phase sequence overcurrent protection

  11. Thermal overload protection

  12. Broken conductor protection

  13. Inrush current detector

  14. Overexcitation protection

  15. Under/over frequency and rate of change of frequency protection

Transformer Protection IED GRT200 Products Image

Metering and recording functions

  1. Metering
    - Power system voltages, currents, power, frequency and power factor

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

Communication Protocols

  1. IEC 61850 (Ed 1.0 and 2.0) or IEC 60870-5-103 for communication with a Substation Automation System

  2. IEC62439 PRP/HSR/RSTP for communication redundancy

Human interfaces

  1. Selection of HMI: Standard LCD / large LCD

  2. 24 configurable tri-state LEDs selectable red/green/yellow

  3. 7 programmable function keys for user demand operation

  4. Personal computer interface (USB and Ethernet ports)

  5. Monitoring jacks for internal circuit test

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