PCS-902S Line Distance Relay

Model: PCS-902S

PCS-902S provides comprehensive protection and control solutions for transmission lines with high-speed sub-cycle distance element.


PCS-902S provides comprehensive protection and control solutions for transmission lines with high-speed sub-cycle distance element. The PCS-902S is intended for application on overhead line, cables and hybrid transmission lines with diverse voltage levels. With its flexibility and the powerful PCS-Studio configuration tool, PCS-902S offers future-oriented system solutions.

  • Six zone phase-to-phase distance protection (21Q/21M) Mho or quadrilateral characteristic, directional, load encroachment, power swing blocking releasing and unique low-voltage elements are provided for phase-to-phase distance protection.
  • One zone phase-to-phase distance protection for pilot scheme (85) An independent zone for pilot scheme, such as PUTT, POTT, Blocking, Unblocking, DTT & Zone Extension.
  • The scheme integrates current reversal logic, weak-infeed echo and open breaker echo. Six zone phase-to-ground distance protection (21Q/21M) Mho or quadrilateral characteristic, reactance characteristic, directional, load encroachment, power swing blocking releasing and unique low-voltage elements are provided for phase-to-ground distance protection.
  • One zone phase-to-ground distance protection for pilot scheme (85) An independent zone for pilot scheme, such as PUTT, POTT, Blocking, Unblocking, DTT & Zone Extension. The scheme integrates current reversal logic, weak-infeed echo and open breaker echo. High-speed DPFC distance protection (21D)
  • Innovative Deviation of Power Frequency Component (DPFC) distance protection quickly clears faults in a sub- cycle.
  • DPFC is immune to the load fluctuation, weak-infeed and power swing. Pilot directional earth-fault protection (85) Directional zero-sequence comparison element for pilot scheme, such as PTT, Blocking and Unblocking.
  • The scheme integrates current reversal logic, weak-infeed echo and open breaker echo. Six stages phase overcurrent protection (67P, 50/51P) Selectable time characteristics (definite-time or inverse-time) and directional elements (forward, reverse or non-directional) are provided.
  • A harmonic blocking function is integrated to restrain each stage independently. Six stages earth-fault protection (67G, 50/51G) Selectable time characteristics (definite-time or inverse-time) and directional elements (forward, reverse or non-directional) are provided.
  • A harmonic blocking function is integrated to restrain each stage independently. Four stages negative-sequence overcurrent protection (67Q, 50/51Q) Selectable time characteristics (definite-time or inverse-time) and directional elements (forward, reverse or non-directional) are provided.
  • Stage 3 can be selected as alarm purpose. One stage undercurrent protection (37)
  • Breaker failure protection for one or two breakers (50BF)
  • Quickly detect failed circuit breakers with the built-in breaker failure detection elements and logic.
  • It can be applied to single-breaker and dual-breaker applications. Four stages undervoltage protection (27P)
  • Energy measurement (active and reactive energies for import and export)
  • CT circuit failure supervision
  • VT circuit failure supervision Fault phase selection
  • Fault Locator with parallel-line compensation
  • Self diagnostic Event recorder including 1024 change-of-binary-input events, 1024 supervision events, 256 control logs and 1024 device logs
  • Disturbance recorder including 32 disturbance records with waveforms (The format is compatible with COMTRADE.)
  • Pilot communication channel supervision
  • System frequency supervision Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute) , IEEE1588
  • Optional single- or dual- pilot channels (fiber optic)
  • Support G.703 and C37.94 Up to four 10Base-T/100Base-TX copper
  • Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP Up to four 100Base-FX optical
  • Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP
  • Two RS-485 serial ports using IEC 60870-5-103 One RS-485 serial port for clock synchronization Support GOOSE communication module using IEC 61850-8-1 GOOSE
  • Full compatibility between IEC 61850 Editions 1 and 2
  • Redundancy protocols PRP and HSR One front RJ-45 port for debugging

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