Over-voltage protection relay NG20

under-voltageunder-frequencytrip circuit

Several functions, required for synchronous generators and not self-started synchronous motors are included. STANDARD PROTECTIVE & CONTROL ELEMENTS • Under Voltage • Directional active overpower • Directional active underpower • Loss of Field • Negative sequence overcurrent Motor/Generator • Thermal Image Motor/Generator • Phase overcurrent side H and side L • Maximum Residual Overcurrent • Voltage restraint overcurrent • Minimum Power Factor • Overvoltage • Residual Overvoltage • Low impedance restricted earth fault • Over frequency • Under frequency • Breaker Failure • CT Supervision • VT Supervision • Trip Circuit Supervision