RCS-922 Stub Differential Relay

The RCS-922 relay is a current differential protection for a stub between two breakers in one-and-a-half breaker arrangements or ring breaker arrangements. The function is activated when the line isolator is open. It can also be applied as current......

  • Overview
  • Functions
  • Features

The RCS-922 relay is a current differential protection for a stub between two breakers in one-and-a-half breaker arrangements or ring breaker arrangements. The function is activated when the line isolator is open. It can also be applied as current differential protection for short lines. It provides overcurrent elements for energizing a faulty bus or energizing a faulty line. It is fully compatible with IEC 61850 communication.

  • Current differential protection. (87)
  • Two-stage overcurrent protection for energizing a bus or a line (50E)
  • CT failure open detection logic.
  • Tripping circuit supervision.
  • Current drift auto adjustment.
  • Self diagnostic.
  • Fault Recorder.
  • GPS clock synchronization.
  • 64 tripping reports, 64 alarm reports and 64 binary input status change reports.
  • High resolution oscillography of last 24 oscillograms. (Compatible with international COMTRADE format)
  • Rear communication ports: Ethernet with IEC 61850 or 2 RS-485 with IEC 60870-5-103 protocol, 1 RS-485 with clock synchronization, 1 RS-232 or RS-485 with printer.
  • Front communication port: 1 RS-232 for testing and setting.

  • The patented adaptive floating threshold method is adopted, which is insensitive to system unbalance and disturbance. The measuring element can get both high security and high speed simultaneously.
  • Overcurrent protection is provided in the relay for energizing a faulty bus or energizing a faulty line.
  • Innovative technology to prevent any undesired trip caused by any component failure is adopted. The relay has two independent data acquisition paths, one for a fault detector and the other for protection and its logic. Tripping outputs are supervised by the fault detector to prevent any maloperation.
  • 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 done 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 format of event report is compatible with international COMTRADE file.
  • The relay is compatible with multiple protocols- IEC61850 and IEC 60870-5-103. It provides networking interface such as RS485, RS232 and Ethernet port.