Microprocessor Over/Under Voltage And Over/Under Frequency Protection Relay

F24, F27d/59d, F47, F59, F59Uo, F78, F81

Voltage and frequency control relay with three-phase and zero component expedients to protection of HV, MV, LV energy transmission and distribution systems.

UM30-A relay measures the “Real RMS” value of three phase and neutral voltages fed by three pieces of high impedance inlet. Zero component voltage can be calculated constituting an open triangle as internal. Inlet of zero component voltage has got 3. Harmonic active filter.

• 2 pieces V/Hz level
• 2 pieces high/low voltage function
• 2 pieces high/low frequency function
• 2 pieces of zero component voltage level with follow-up incorrect phase
• 2 pieces of positive/negative component voltage level
• Protection function of generator vector shifting
• Failure record
• Modbus communication protocol
• UL / CSA listing