Over-excitation protection relay PCS-978S

synchronizationfrequencyphase unbalance

Product overview
PCS-978S transformer relay delivers fast, selective protection, control and monitoring for two-winding and three-winding transformers, auto-transformers and shunt reactors. All transformer protection elements are user-configurable. Integrated diagnostic, disturbance/event recording and extensive communication interfaces enable application in both conventional and digital substations.

Protection Functions

• 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)

Control Functions

• 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 indication and control
• Automatic voltage regulation (90V)
• Parallel voltage regulation (PVR)

Supervision functions

• CT circuit failure supervision (CTS)
• VT circuit failure supervision (VTS)
• Tripping circuit supervision (TCS)
• Self diagnostic
• Comprehensive fault recording (buffer up to 10,000 sampled points at 1.2 or 9.6 kHz)
• Event recorder: 1024 disturbance records, 1024 binary events, 1024 supervision events, 256 control logs, 1024 device logs
• Disturbance recorder: 64 disturbance records with waveforms (COMTRADE compatible)
• Single-line diagram display

Measurement and Metering

• Measurements: U, I, P, Q, S, Cosφ, f
• Positive, negative and zero sequence components
• Harmonics up to 15th order
• Energy metering: active and reactive, import and export
• DC analog inputs for transducers (0–20 mA or 0–±10 V)

Communication

• Supported 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 PRP, IEC 62439 HSR, IEEE 802.1w 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 (one configurable as RS-232 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)

Technical specifications

• Applicable to two-winding, three-winding, auto-transformers and shunt reactors
• Supports IEC 61850 Edition 1 & 2 with GOOSE and SV interfaces
• Process-level networking: peer-to-peer (P2P), single and dual network modes
• Station-level network: MMS messaging and processing of process-level GOOSE
• Integrated fault diagnostics, disturbance and event recording
• Fault recording buffer: up to 10,000 sampled points at 1.2 kHz or 9.6 kHz
• Event recorder capacities as listed above
• Disturbance recorder: 64 records with waveform files in COMTRADE format
• Energy metering: active/reactive import/export
• Analog inputs: DC transducer inputs 0–20 mA or 0–±10 V
• Wide protocol support including Modbus, DNP3.0, IEC 60870-5-103, IEC 61850 family, PRP/HSR and RSTP
• Multiple copper and optical Ethernet ports plus serial and clock-sync interfaces