Application
The RCS-9681C provides high performance digital protection, control and monitoring unit for power transformer in solidly grounded, impedance grounded, Peterson coil grounded and ungrounded system. It includes complete backup protection solution applied for each side of power transformer. It is fully compatible with IEC 61850 communication.
Functional Block Diagram
Functions
l Three-level overcurrent protection. (50P, 51P)
l Two-level directional overcurrent protection. (67P)
l Three-level zero sequence overcurrent protection. (50G, 51G)
l Ground detector protection. (64)
l Thermal overload protection. (49)
l Activating cooling equipment function.
l On-load-tap-change (OLTC) blocking function during overload.
l Seven (7) 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 Operating circuit supervision.
l Voltage and current drift auto adjustment.
l Self diagnostic test.
l GPS 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 Overcurrent protection could be supervised by voltage elements.
l Overvoltage protection could be supervised by zero sequence current element.
l Ground detector protection constitutes of zero sequence overcurrent protection, neutral zero sequence overvoltage protection.
l The RCS-9681 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 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 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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