Under Voltage Protection Relay

A clear indication of the fault present is provided by these relays for rapid troubleshooting and reduced downtime.

Under voltage protection relay.

When voltage returns to in range the delay is not used and the relay indicates in range immediately. Current protection relay dgp excitation loss over voltage under voltage. Principle of under voltage protection. This information is internally processed by the microprocessor to take the voltage protection.

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. Three phase motors and other equipment are commonly used in a variety of industries. When the voltage drops below the rated voltage typically 85 stage 2 90 stage 1 the under voltage protection will be activated.

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. Under voltage protection sense the phase to phase voltage of the generator transformer using instrument transformer potential transformer. The time setting is used to avoid tripping due to any transient disturbances. The under voltage setting is usually 80 percent of the normal operating voltage.