Dc Earth Leakage Relay

These relays are ideal for detecting and localizing earth leakage in dc power systems. The el731 is a microprocessor based ac dc sensitive earth leakage relay that offers complete coverage for all frequencies from 0 6 000 hz. Dc earth leakage relay.

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Thus leakage current if any will be dependent on the resistance value between respective terminals higher the resistance lower is the leakage.

Dc earth leakage relay.

The el731 ac dc sensitive earth leakage relay is a revolutionary product that finally solves common ground fault problems associated with variable frequency drives and is equally applicable to ac dc and mixed ac dc systems. The dc leakage current is measured by electronic ag sensor inserted in each monitored load circuit. The relay senses the dc earth leakage current for any equipments like switch boards rectifiers battery chargers by sensing resistance between positive negative terminals of dc system earth. The relay senses the dc earth leakage current for any equipments like switch boards rectifiers battery chargers by sensing resistance between positive negative terminals of dc system earth.

It detects a wide range of earth leakage currents and can reliably protect a variety of applications including conveyor. The measuring method is based on the principle that the positive and the negative current in a fault free load circuit sum to zero. Thus leakage current if any will be dependent on the resistance value between respective terminals higher the resistance lower is the leakage. Unlike potential based sensors these sensors can localize the earth leakage fault to specific feeders if the feeder cables are passed through the sensor unit.

Two ct s are required for the entire frequency range or one ct can be used for only low or high frequency detection. If an earth fault is present the fast response sensor detects the difference between the two currents and. Operates on ac resistance grounded systems and dc grounded systems.