59G RCS-985G Generator Transformer Two stages phase to phase overvoltage protection Replay for hydro-generators, gas turbine generators and pumped-storage generators

Protection for Generator

Current differential protection. (87G)
Unrestrained instantaneous differential protection. (87UG)
DPFC current differential protection. (87G)
High sensitive transverse differential protection. (87G)
Longitudinal zero sequence overvoltage protection for turnto- turn fault. (59N/60)
DPFC directional protection for turn-to-turn fault. (67)
Two stages phase-to-phase distance protection. (21G)
Voltage controlled overcurrent protection. (51V)
Current blocking element at generator’s terminal.
Fundamental zero sequence overvoltage protection for stator earth fault. (64G1)
Third harmonic protection for stator earth fault. (27/59TN, 64G2)
Two stages of one-point-earth fault protection of rotor. (64R)
Two-point earth fault protection of rotor. (64R)

Definite and inverse time stator thermal overload protection.(49S)
Definite and inverse time negative sequence overload protection of rotor. (46/50, 46/51, 49R)
Loss-of-excitation protection. (40)
Out-of-step protection. (68/78)
Two stages phase-to-phase overvoltage protection. (59G)
Phase-to-phase undervoltage protection. (27G)
Two stages definite time over-excitation protection. (24)
Inverse time over-excitation protection. (24)
Reverse power protection. (32G)
Reverse power protection during generator shutting down.(32G)
Three stage underfrequency protection. (81G)
Two-stage overfrequency protection. (81O)
Startup/shutdown protection of generator.
Accidental energization protection. (50/27)
Voltage balance function. (60)
Under-frequency overcurrent protection.
Voltage transformer supervision. (47/60G)
Current transformer supervision. (50/74)
Mechanical protection.

Excitation System

Current differential protection for exciting-transformer. (87T)
Current differential protection of AC exciter. (87G)
Overcurrent protection. (50P/51P)
Definite and inverse time thermal overload protection for exciting windings. (87G)
Current transformer supervision of excitation set. (50/74)

Monitoring and Metering

Automatic self-supervision.
Fault recording.
Event recording.
Present recording.
Front communication port (RS232).
Rear communication ports to host.
Rear communication port to printer.
Time synchronization.
Voltage and current drift auto-adjustment.

The RCS-985G is a generator protection intended for the application to sophisticated generators, including turbogenerators, hydro-generators, gas turbine generators and pumped-storage generators. It supports wall surface mounted and flush mounted in a control panel. The RCS-985G is fully compatible with IEC 61850 communication with an additional communication unit.