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  • PCS-985TI Transformer Relay

  • PCS-985TI is a high performance numerical transformer protection device, which integrates main and backup protection into one device. It provides complete protection of a transformer in any voltage level, and is typically applied for startup/standby transformer or auxiliary transformer of power plant with multiple branches, and main transformer, etc. It also provides basic protection of a two-winding main transformer and one or two auxiliary transformer. 

    PCS-985TI provides up to 80 analog input channels including current and voltage inputs. The transformer protections are configurable. Ancillary functions of fault diagnostic, disturbance records, event records and communication function are integrated in the device.

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Main Transformer Protection
  • Current differential protection (87T)
  • Transformer restricted earth fault protection (64REF)
  • Negative-sequence Overcurrent protection (50/51Q)
  • Overexcitation protection (24)
  • Phase overcurrent protection (50/51P)
  • Phase overcurrent alarm elements (51PAlm)
  • Ground overcurrent protection (50/51G)
  • Phase overvoltage protection (59P)
  • Phase undervoltage protection (27P)
  • Residual overvoltage protection (59G)
  • Overfrequency protection (81O)
  • Underfrequency protection (81U)
  • Rate-of-frequency-change protection (81R)
  • Thermal overload protection (49)
  • Impedance protection (21)
  • Breaker failure protection (50BF)
  • Pole disagreement protection (62PD)
  • Breaker flashover protection (50F)
  • Mechanical protection (MR)
Step-down Transformer Protection
  • Current differential protection (87T)
  • Transformer restricted earth fault protection (64REF)
  • Phase overcurrent alarm elements (51PAlm)
  • Residual overvoltage protection (59G)
  • Step-down transformer HV side phase overcurrent protection (50/51P)
  • Step-down transformer LV side phase overcurrent protection (50/51P)

Miscellaneous
  • Fault detector (FR)
  • Voltage and current drift auto adjustment.
  • VT circuit supervision (VTS)
  • CT circuit supervision (CTS)
  • CT saturation detection (CTS)
  • Self diagnostic
  • GPS clock synchronization
  • Fault recorder
  • IEC61850 MMS & GOOSE for station bus
  • IEC60870-5-103 protocol
  • MODBUS protocol
  • DNP 3.0 protocol