Earth-leakage protection relay PCS-985GE

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Product Overview
PCS-985GE is a numerical generator protection device that integrates main and backup protection functions in a single unit. It provides comprehensive stator and rotor protection for power-plant generators and basic protection for excitation transformers. The PCS-985GE is suitable for turbo-dynamo, gas-turbine, hydro, pumped-storage and nuclear generators with various connection schemes.

Miscellaneous

• Fault detector (FR)
• Voltage and current drift auto adjustment
• VT circuit supervision (VTS)
• CT circuit supervision (CTS)
• CT saturation detection
• Self diagnostic
• GPS clock synchronization
• Fault recorder
• IEC61850 MMS & GOOSE for station bus
• IEC60870-5-103 protocol
• MODBUS protocol
• DNP 3.0 protocol

Excitation Transformer Protection

• Differential protection (87ET)
• Overcurrent protection (50/51P)

Generator Protection

• Current differential protection (87G)
• Neutral point transverse differential protection (87NTG)
• Generator inter-turn protection (59NIT)
• Stator overload protection (49S)
• Fundamental zero-sequence voltage stator ground fault protection (64S1)
• Generator 3rd harmonic stator ground fault protection (64S2)
• Generator Ping-Pang type rotor ground fault protection (64R)
• Rotor ground fault protection with low-frequency square-wave voltage injection (64RInj)
• Generator rotor winding overload protection (49E)
• Generator inadvertent energization protection (50/27)
• Generator out-of-step protection (78)
• Generator startup and shutdown protection (StShut)
• Generator shaft overcurrent protection (51GS)
• Negative-sequence overload protection (46G)
• Generator reverse power protection (32R)
• Generator low forward power protection (32F)
• Overexcitation protection (24)
• Loss of excitation protection (40G)
• Generator phase overcurrent protection (50/51P)
• Phase overvoltage protection (59P)
• Undervoltage protection (27P)
• Overfrequency protection (81O)
• Underfrequency protection (81U)
• Impedance protection (21)
• Breaker failure protection (50BF)
• Mechanical protection (MR)
• Voltage balance protection (60)

Technical specifications

• Integrates main and backup generator protection in one device
• Up to 28 analog input channels (current and voltage)
• Configurable generator protection functions covering stator, rotor, ground faults, out-of-step, reverse power, over/under frequency and voltage protections
• Includes fault diagnostic, disturbance recording and event recording functions
• Supports GPS clock synchronization
• Communication protocols: IEC61850 MMS & GOOSE, IEC60870-5-103, MODBUS, DNP 3.0
• Applicable to turbo-dynamo, gas-turbine, hydro, pumped-storage and nuclear generators