Numerical Transformer Differential Protection Relay – GK87TR, GK87T1, GK87T2

Compact and versatile solution for Transformer Protection

GK87 series are dedicated Transformer protection relays perfectly aligned for protection, control, measurement, and supervision of the Single phase and Three phase Transformers. Transformers are high capital cost assets in electrical power systems. In case Mechanical faults, it must be Indicated for Scheduling the Preventive Maintenance. 

GK Power, RDSO approved leading manufacturer in India offers a Numerical Differential protection relay at industry’s latest Technologies. Enhanced safety by reducing hazards with safety-conscious testing of IEC 60255-1, IEC 60255-26 and IEC 60255-27, This relays unleash its own full potential of working in hard environments with Ingress protection of IP54.


Differential  protection for overhead lines of 25 kV and 2X25 kV systems for Indian Railways with respect to the below specification


Protection Function

  • Differential Protection
  • Buchholz Trip
  • Oil Temperature Trip
  • Winding Temperature Trip
  • PRD Trip

Product benefits

  • Our relays available with selectable communication Protocols such as IEC 61850 and IEC 60870-5-103 for SCADA communication through RS485 and RJ45 ports available at the rear side.
  • 50 cycles of actual waveform are stored in the built-in memory with date time stamping for analysing fault.
  • Self Diagnostic feature for the continuous monitoring of the internal hardware and alarm generation in case of failure of any critical components.
  • Ready to install at 25 kV Traction Transformer,  2×25 kV Scott connected and V connected Transformer at TSS

Product features

  • Withdraw-able type Flushmounted
  • 20 x 4 LCD Alpha Numeric Display with back light Control and 10 Status Indication LEDs.
  • 5 Keys for Settings and navigation, Individual key for Read/Record, LED Reset and Hardware Reset