Under Voltage Protection Relay

When voltage returns to in range the delay is not used and the relay indicates in range immediately.

Under voltage protection relay. This information is internally processed by the microprocessor to take the voltage protection. A clear indication of the fault present is provided by these relays for rapid troubleshooting and reduced downtime. The voltage protection relay vpr a has been designed to measure the line or phase rms voltages under normal conditions or under disturbances. The under voltage setting is usually 80 percent of the normal operating voltage.

If the voltage falls below this level for the set amount of time then the tripping command issued by the relay and hence the system is isolated. Under voltage protection sense the phase to phase voltage of the generator transformer using instrument transformer potential transformer. As long as the monitored voltage remains below the maximum voltage the equipment can withstand the relay remains de energized and remains closed keeping the load energized. Geya under over voltage relay provides protection to equipment that cannot handle excess voltages.

There is 1 0 to 1 5 v of hysteresis on the limit threshold settings to prevent oscillation and relay chatter when a voltage is at a low or high extreme right on the limit threshold. Current protection relay dgp excitation loss over voltage under voltage. Principle of under voltage protection. A three phase monitor relay with undervoltage protection can shutdown equipment when undervoltage occurs preventing damage.