Under Voltage Protection Relay

A three phase monitor relay with undervoltage protection can shutdown equipment when undervoltage occurs preventing damage.

Under voltage protection relay.

This information is internally processed by the microprocessor to take the voltage protection. 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. When the voltage drops below the rated voltage typically 85 stage 2 90 stage 1 the under voltage protection will be activated. When voltage returns to in range the delay is not used and the relay indicates in range immediately.

The under voltage setting is usually 80 percent of the normal operating voltage. The time setting is used to avoid tripping due to any transient disturbances. The voltage protection relay vpr a has been designed to measure the line or phase rms voltages under normal conditions or under disturbances. 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.

Principle of under voltage protection. Current protection relay dgp excitation loss over voltage under voltage. A clear indication of the fault present is provided by these relays for rapid troubleshooting and reduced downtime. Three phase motors and other equipment are commonly used in a variety of industries.