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  • PCS-974 Mechanical Relay

  • PCS-974 is a dedicated auxiliary relay for transformer nonelectrical protection. This IED provides sixteen high-powerpickup binary inputs for mechanical element monitoring, alarming and tripping. The high-power-pickup design reduces the risk of Electro-Magnetic Interference (EMI) in order to improve reliability. Generally, mechanical relays include winding temperature relays, oil temperature relays and buchholz relays. The relay can be used for transformer and generator protection.

    The PCS-974 is compatible with IEC 61850 station bus and process bus applications. It supports IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampling Value. The RJ-45 faceplate port is provided for testing and setting in effort to make commissioning and maintenance easier.

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Protection and Control
  • Up to sixteen channels of mechanical protection (26: oil and winding temperature; 63: gas, pressure; 71: oil level; etc)
  • Self diagnostic
  • Event recorder including 1024 change-of-binary-input events, 1024 supervision events and 1024 operating logs
  • Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second) and PPM (Pulse-Per-Minute) logs

  • 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 two 100Base-FX optical Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP ( Sharing two copper Ethernet ports)
  • Two RS-485 serial ports using IEC 60870-5-103
  • One RS-485 serial port for clock synchronization

User Interface
  • HMI interface with large-size LCD and 9-button keypad on the front panel
  • One front RJ-45 port for testing and setting
  • One RS-232 or RS-485 rear port for printer
  • Language selection – English + selected language
  • Assistant software - PCS-Explorer
  • To eliminate the interference from switchyard field, high- power-pickup binary inputs are designed for dedicated mechanical inputs, in order to improve the protection reliability.
  • A unique two-out-two logic is adopted in hardware design to improve security. Coordinating with the redundant scheme, this solution improves both security and dependability of protection system. The two independent data acquisition paths are provided to prevent mal-operation caused by component failure. One works as a fault detector and the other is designed for protection logic. Tripping outputs are supervised by both data acquisition paths.
  • Comprehensive flexibility is provided via the modular hardware design, scalable function library, programmable logics, configurable I/Os and definable LEDs. This allows users to create customized schemes for specific projects. Two fixed LEDs and 18 definable 3-color LEDs (Green/ Yellow/Red) are provided.
  • The relay is designed based on NR Electric’s well- established and proven hardware platform with multi- processor architecture. The multi-CPU technology supports parallel operation of CPU modules.
  • The relay is fully compatible with IEC 61850, it includes station bus communication and process bus communication. The relay provides up to 6 Ethernet ports for process bus with IEC 61850-9-2 Sampling Value and IEC 61850-8-1 GOOSE, as well as up to 4 Ethernet ports for station bus with IEC 61850-8-1 MMS.