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PCS-978 Transformer Relay
PCS-978 provides full scheme protection and control solution for varies type power transformers including multiple-winding transformers and auto-transformers, as well as shunt reactors. It integrates up to 36 current/voltage inputs in order to be suitable for applications like one-and-a-half breaker or ring breaker arrangements. Up to 6 group CT inputs are included in current differential protection. In addition, 288 vector groups are available for 3-winding transformers, as well as 24 vector groups, which available for 2-winding transformer.
The unique current differential protection includes conventional phase current differential elements and innovative DPFC differential elements, in effort to provide reliable and secure protection and to ensure the safety of vital assets. To improve the reliability of mechanical protection, dedicated high-threshold binary inputs are designed for mechanical protection. In addition, automatic CT ratio compensation and vector group compensation are provided to eliminate the external interposing CTs.
The PCS-978 is compatible with IEC 61850 station bus and process bus applications. It supports IEC 61850-8-1 MMS, GOOSE and IEC 61850-9-2 Sampled Value. Additionally, a RJ- 45 faceplate port is provided for testing and setting in order to make commissioning and maintenance easier.
- Protection and Control Monitoring and Metering Communcation
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Transformer biased current differential protection (87T)
Transformer unrestrained instantaneous current differential protection (87T)
Transformer biased DPFC current differential protection (87T)
Reactor biased current differential protection (87R)
Reactor unrestrained instantaneous current differential protection (87R)
Reactor biased DPFC current differential protection (87R)
Inrush blocking
CT saturation blocking
Overexcitation blocking
CT circuit failure blocking
Amplitude compensation
Phase angle compensation
Restricted Earth Fault Protection (64REF)
Winding differential protection (87W)
Inter-turn fault protection for reactor (21IT)
Overexcitation protection (24)
Underfrequency and overfrequency protection (81U/81O)
Mechanical protection (MR)
Temperature protection (26)
Two-stage phase-to-phase impedance protection (21P)
Two-stage phase-to-ground impedance protection (21G)
Power swing blocking releasing (PSBR)
Four-stage phase overcurrent protection (50/51P)
Four-stage neutral overcurrent protection for each side(50/51G)
Two-stage negative-sequence overcurrent protection (50/51Q)
Two-stage phase overvoltage protection (59P)
Two-stage residual overvoltage protection (59G)
Four-stage undervoltage protection (27P)
Thermal protection (49)
Breaker failure protection (50BF)
Pole disagreement protection (62PD)
Phase overcurrent alarm (51PAlm)
Residual overvoltage alarm (59GAlm)
Voltage and current drift auto adjustment
Frequency tracking
Transformer biased current differential protection (87T)
Transformer unrestrained instantaneous current differential protection (87T)
Transformer biased DPFC current differential protection (87T)
Reactor biased current differential protection (87R)
Reactor unrestrained instantaneous current differential protection (87R)
Reactor biased DPFC current differential protection (87R)
Inrush blocking
CT saturation blocking
Overexcitation blocking
CT circuit failure blocking
Amplitude compensation
Phase angle compensation
Restricted Earth Fault Protection (64REF)
Winding differential protection (87W)
Inter-turn fault protection for reactor (21IT)
Overexcitation protection (24)
Underfrequency and overfrequency protection (81U/81O)
Mechanical protection (MR)
Temperature protection (26)
Two-stage phase-to-phase impedance protection (21P)
Two-stage phase-to-ground impedance protection (21G)
Power swing blocking releasing (PSBR)
Four-stage phase overcurrent protection (50/51P)
Four-stage neutral overcurrent protection for each side(50/51G)
Two-stage negative-sequence overcurrent protection (50/51Q)
Two-stage phase overvoltage protection (59P)
Two-stage residual overvoltage protection (59G)
Four-stage undervoltage protection (27P)
Thermal protection (49)
Breaker failure protection (50BF)
Pole disagreement protection (62PD)
Phase overcurrent alarm (51PAlm)
Residual overvoltage alarm (59GAlm)
Voltage and current drift auto adjustment
Frequency tracking
CT failure supervision
VT failure supervision
Self diagnostic
Event recorder including 1024 change-of-binary-input events, 1024 supervision events and 1024 device logs
Disturbance recorder including 32 disturbance records with waveforms (The format is compatible with COMTRADE.)
Clock synchronization using IRIG-B, SNTP, PPS (Pulse-Per- Second), PPM (Pulse-Per-Minute) and IEEE 1588
Optional two or four 10Base-T/100Base-TX copper Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP
Optional two 100Base-FX optical Ethernet ports using IEC 61850, DNP3.0 or IEC 60870-5-103 over TCP/IP ( Sharing two copper Ethernet ports)
Optional two RS-485 serial ports using IEC 60870-5-103
One RS-485 serial port for clock synchronization
One RS-232 rear port for printer
One faceplate RJ45 port for testing and setting
Optional Sampling value and GOOSE communication module with six optical Ethernet ports using IEC 61850-9-2 and IEC 61850-8-1 GOOSE