The RCS-915 series busbar protection devices provide main and back-up
protection of busbars for all kinds of busbar wiring configurations, such as
single busbar, double busbar, double busbar with transfer bus, double busbar
with section, one-and-a-half breaker, etc. It is fully compatible with IEC 61850
communication with an additional communication unit.
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Busbar differential protection. (87B) - Steady-state percentage differential
protection - DPFC percentage differential protection
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Bus coupler/section protection. - SOTF protection (50) - Dead zone
protection (51/62EF) - Breaker failure protection (50BF) - Overcurrent
protection (51P/51N) - Pole discrepancy protection (51/62PD)
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Feeder protection. - Breaker failure protection (50BF) - End fault
protection (51/62EF) - Pole discrepancy protection (51/62PD) - Transfer trip
(TT)
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CT circuit failure supervision.
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VT circuit failure supervisionCT failure detection logic.
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Disconnected position alarm.
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Busbar voltage switching.
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Receiving PPS (pulse per second) and PPM (pulse per minute) via external
contact
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Receiving PPS, PPM and IRIG-B signal via RS-485
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Receiving time synchronization message from substation automation
system
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32 latest fault reports, 32 latest self-supervision reports and 32 latest
status change of binary input reports
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8 latest fault waveforms (The file format of disturbance recorder is
compatible with international COMTRADE file)
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2 RS-485 communication rear ports (option optical fibre interface)
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1 RS-485 communication rear ports for time synchronization
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1 RS-232 communication rear ports for printer
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1 RS-232 communication front port for debugging
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Support IEC60870-5-103 protocol
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Support ModBus protocol
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Support IEC61850 protocol (through external auxiliary device) and IEC
60870-5-103 communication protocol
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The RCS-915 provides less than 20ms typical trip time for busbar
differential protection.
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The CPU system adopts parallel calculation.
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Independent fault detector element is equipped.
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The device integrates high sensitive percentage differential
protection.
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It is matching to different CT ratios and settable CT adjustment
coefficient.
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Busbar differential element can be supervised by voltage
elements.
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The sensitive and high-speed DFPC current differential element is integrated
in the relay.
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A fully-fledged adaptive weighted anti-saturation algorithm.
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The breaker failure protection of all feeders, bus coupler and bus section
is integrated in the RCS-915 relay.
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Various GPS clock synchronizations are provided: second/ minute pulse via
binary input or RS-485, message via communication ports and IRIG-B
synchronization.
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