Application
The RCS-9621C is a digital protection, control and monitoring unit for auxiliary transformers and ground transformers in impedance grounded, Peterson coil grounded or ungrounded system. It is fully compatible with IEC 61850 communication.
Functional Block Diagram
Functions
l Three-level overcurrent protection. (50P, 51P)
l Two-level negative sequence overcurrent protection. (50Q, 51Q)
l Inverse time positive sequence overcurrent protection for HV side. (51)
l Three-level zero sequence overcurrent protection for HV side and LV side. (50G, 51G)
l Zero sequence overvoltage protection for HV side. (59G)
l Undervoltage protection. (27)
l Non-electrical quantity protection. (63, NE)
l Thermal overload protection. (49)
l Binary inputs.
l Circuit breaker control.
l Analog quantity measurements.
l Four (4) pulse accumulating inputs.
l Circuit breaker monitoring.
l CT failure detection logic.
l VT failure detection logic.
l Voltage and current drift auto adjustment.
l Self diagnostic test.
l sGPS clock synchronization.
l Fault Recorder.
l 64 tripping reports and 256 SOE (Sequence of Events) records.
l High resolution oscillography of last 8 oscillograms
(compatible with international COMTRADE format)
l Rear communication ports: Ethernet with IEC 61850, 2 RS-485 with IEC 60870-5-103, 1 RS-485 for clock synchronization, 1 RS-485/232 for communication to printer.
Features
l On the premise of 24 samples per cycle, all data measurement, calculation and logic discrimination could be done within one sampling period. The event recording and protection logic calculation are completed simultaneously.
l Overcurrent protection could be supervised by voltage elements.
l Non-electrical quantity protection could be configured as thermal, gas, oil temperature, winding temperature, pressure, oil level and so on.
l The RCS-9621 relay constantly measures a large mount of analog quantities, such as phase voltage, phase-to-phase voltage, neutral voltage, phase current, neutral current, active power, reactive power, power factor and frequency.
l The relay can monitor the status and record the number of switching times of the circuit breaker.
l The relay provides GPS clock synchronization, including second pulse and IRIG-B synchronization.
l The HMI interface with a LCD and a 9-button keypad on the front panel is friendly to users.
l The format of event report is compatible with international COMTRADE file.
l The relay is equipped with Ethernet ports with the IEC 61850 protocol and RS-485 ports and IEC 60870-5-103 protocol.
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