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PCS-978S Transformer Relay
PCS-978S transformer relay provides fast and selective protection, control and monitoring for two-winding transformers, three-winding transformers, auto-transformers, as well as shunt reactors. The full transformer protections are configurable by user. Ancillary functions of fault diagnostic, disturbance records, event records and communication function are integrated in the device.
PCS-978S is applicable not only to conventional substations, but also to digital substations. It supports IEC 61850 Editions 1 and 2 and provides GOOSE and SV network interfaces with high real-time performance. The process level network supports peer-to-peer (P2P) mode and networking mode, including single network mode and dual network mode. The station level network could also receive and send MMS messages (such as interlocking signals) or process level GOOSE messages (such as trip signals).
- Protection Functions Control Functions Supervision functions Measurement and Metering Communication
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Transformer differential protection (87T)
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)
Reactor differential protection (87R)
Inter-turn fault protection for reactor (21IT)
Four zone phase-to-phase distance protection (21T)
Four zone phase-to-ground distance protection (21T)
Overexcitation protection (24)
Phase overcurrent protection (67P, 50/51P)
Earth-fault protection (67G, 50/51G)
Negative-sequence overcurrent protection (67Q, 50/51Q)
Thermal overload protection (49)
Breaker failure protection (50BF)
Phase undervoltage protection (27P)
Phase overvoltage protection (59P)
Zero-sequence overvoltage protection (59G)
Overfrequency protection (81O)
Underfrequency protection (81U)
Switchgear control
Double point status synthesis
Remote/Local control mode switch
Interlocking logic for control
Direct control
Closing synchronism check with voltage selection
Switchgear trip counter
Tap position indicator and control
Automatic voltage regulation (90V)
Parallel voltage regulation (PVR)
CT circuit failure supervision (CTS)
VT circuit failure supervision (VTS)
Tripping circuit supervision (TCS)
Self diagnostic
Powerful faults recording (max. buffer for 10,000 sampled points at 1.2 or 9.6kHz)
Event recorder including 1024 disturbance records, 1024 binary events, 1024 supervision events, 256 control logs and 1024 device logs
Disturbance recorder including 64 disturbance records with waveforms (the file format of disturbance recorder is compatible with international COMTRADE file)
Single line diagram representation in display
U, I, P, Q, S, Cos, f
Positive, negative and zero sequences
Max.15th harmonics
Energy metering (active and reactive energies for import and export)
DC analog inputs for transducers (0~20mA or 0~±10V)
Support of various protocols
Modbus, DNP3.0, IEC 60870-5-103, IEC 61850 Ed.1 & Ed.2, IEC 61850 MMS Server, IEC 61850-8-1 GOOSE, IEC 61850-9-2LE SV, IEC 62439 Parallel Redundancy Protocol (PRP), IEC 62439 High-availability Seamless Ring (HSR) Redundancy Protocol, IEEE 802.1w Rapid Spanning Tree Protocol (RSTP).
Up to four 10Base-T/100Base-TX copper Ethernet ports
Up to fourteen 100Base-FX optical Ethernet ports
Up to four 1000Base-SX optical Ethernet ports
Two RS-485 serial ports for communication, the second one can be used as a RS-232 port for printer
One RS-485/TTL serial port for clock synchronization
One BNC port for clock synchronization
One ST-connector port for clock synchronization
Two RJ45 debugging ports (front and rear)