Under Voltage Protection Relay

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

Under voltage protection relay. Geya under over voltage relay provides protection to equipment that cannot handle excess voltages. The voltage protection relay vpr a has been designed to measure the line or phase rms voltages under normal conditions or under disturbances. The time setting is used to avoid tripping due to any transient disturbances. A clear indication of the fault present is provided by these relays for rapid troubleshooting and reduced downtime.

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. The under voltage setting is usually 80 percent of the normal operating voltage. When the voltage drops below the rated voltage typically 85 stage 2 90 stage 1 the under voltage protection will be activated. Under voltage protection sense the phase to phase voltage of the generator transformer using instrument transformer potential transformer.

Three phase motors and other equipment are commonly used in a variety of industries. Principle of under voltage protection. This information is internally processed by the microprocessor to take the voltage protection. When voltage returns to in range the delay is not used and the relay indicates in range immediately.