RCS-923 Breaker Failure Protection

The RCS-923 is designed to provide breaker failure initiation and auxiliary protection for circuit breakers. It also can be used as the overcurrent protection of bus coupler or bus section. The RCS-923 integrates breaker failure protection......

  • Overview
  • Functions
  • Features

The RCS-923 is designed to provide breaker failure initiation and auxiliary protection for circuit breakers. It also can be used as the overcurrent protection of bus coupler or bus section. The RCS-923 integrates breaker failure protection, pole discrepancy protection, two stages phase overcurrent protection, two stages zero-sequence overcurrent protection and SOTF protection.

  • Breaker failure initiation. (50BF)
  • Two-stage phase overcurrent protection. (50P/51P)
  • Phase directional overcurrent protection. (67P)
  • Two stages zero-sequence overcurrent protection (50/51N)
  • Zero sequence directional overcurrent protection. (67N)
  • Overcurrent protection for faulty bus or faulty line energizing. (50/51E)
  • Pole discrepancy protection.
  • Switch onto fault. (SOTF)
  • Self diagnostic test.
  • Current drift auto regulation.
  • Event Recorder including 128 binary input change reports, 128 self-supervision reports and 128 operating reports.
  • Disturbance recorder including 128 fault reports, and 24 waveforms.
  • Self diagnostic.
  • 2 RS-485 communication rear ports conform to IEC 60870- 5-103 protocol
  • 1 RS-485 communication rear ports for clock synchronization
  • 4 optional Ethernet ports, IEC 61850, or IEC 60870-5-103 over TCP/IP
  • 1 RS-232 communication faceplate port for testing and setting
  • 1 RS-232 communication rear ports or RS-485 for printer

  • Overcurrent protection is provided in the relay for energizing a faulty bus or energizing a faulty line.
  • The self-adaptive floating threshold only reflects the deviation of power frequency component, thus is immune to system imbalance and system disturbance.
  • The data acquisition system is completely independent of electronic circuit. The DC power supply of output relay is switched on only if the general fault detector element operates so as to avoid maloperation resulting from damage of any apparatus.
  • The connector type can be selected as plug in/out terminal connector or crimp terminal connector. The unique plug in/ out terminal connectors from the relay rear panel to the terminal blocks on the rack or cabinet makes the on-site commissioning and replacement much easier than the traditional screw terminals when you do the commissioning.
  • On the premise of 24 samples per cycle, all data measurement, calculation and logic discrimination can be completed within one sampling period. The event recording and protection logic calculation are completed simultaneously.
  • The relay provides GPS clock synchronization, including message, second pulse, minute pulse and IRIG-B synchronization.
  • The relay is compatible with multiple protocols- IEC61850 and IEC 60870-5-103. It provides networking interface such as RS485, RS232 and Ethernet port.