PCS-974 Transformer Auxiliary Relay

The PCS-974 relay provides mechanical protection for transformer tanks. The source of mechanical protection can be designed from non-electrical quantities, such as gas, oil temperature, winding temperature, pressure and oil level. It receives the......

  • Overview
  • Functions
  • Features

The PCS-974 relay provides mechanical protection for transformer tanks. The source of mechanical protection can be designed from non-electrical quantities, such as gas, oil temperature, winding temperature, pressure and oil level. It receives the mechanical inputs from transformer tank and issues the tripping or alarm command with or without time delay. The mechanical inputs employ the inputs with large pickup power instead of common binary inputs.

Protection and Control
  • Mechanical protection (26: oil and winding temperature; 63: gas, pressure; 71: oil level; etc)
  • Self diagnostic
  • Auxiliary power supervision
  • Event recorder including 1024 disturbance records, 1024 binary events, 1024 supervision events and 1024 operating logs

Communication
  • Two 10Base-T/100Base-TX (RJ45) ports and two optional 100Base-FX ports with IEC 61850-8-1 MMS and GOOSE for non-time-critical message, IEC 60870-5-103 over TCP/IP or DNP 3.0
  • Two RS-485 rear ports with IEC 60870-5-103
  • Six or Eight 100Base-FX ports with IEC 61850-9-2 Sampling Value and GOOSE for time-critical message
  • One RS-485 rear port for clock synchronization
  • One RS-232 rear port for printer
  • 1 faceplate RJ45 port for testing and setting
  • Clock synchronization via Pulse-Per-Second, IRIG-B and SNTP

  • The relay is designed based on NR’s well established and proven hardware platform with multi-processor architecture. The multi CPU technology supports the parallel operation of CPU modules.
  • The relay provides GPS clock synchronization, including second pulse, IRIG-B and SNTP.
  • The connector type is optional, one is the plug in/out terminal connector and the other is the screw terminal connector. The unique plug in/out terminal connectors are used to connect the rear panel to the terminal blocks on the rack or cabinet, making on-site commissioning and replacement much easier than using traditional screw terminals.
  • The relay is compatible with IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampling Value and provides the independent interfaces for station bus and process bus respectively.