Earth Continuity Relay Theory

In the typical distribution circuit shown in fig 1 an earth leakage relay provides protection against leakage to earth and earth faults.

Earth continuity relay theory.

In fact if the motor was running it would become impossible to stop it using the pilot switch. The relay has been approved to be intrinsically safe and is suitable for use in zone 1 or 2 hazardous areas. The ic3 utilises microprocessor technology to provide a greater level of stability over longer pilot cables by using digital filtering techniques. We took a fresh look at earth continuity safety and as nzs2081 compliance to design a new method of earth continuity protection that utilises a trip curve to discriminate between earth disconnection faults and incremental increases in the earth return impedance.

The loop resistance is constantly indicated on a 7 segment lcd display. Ampcontrol remains at the top of the field for innovation in earth continuity protection relay design. The relay is housed in a sprecher schuh enclosure with three led indicators. This relay is micro processor controlled and can withstand high induced ac voltages and injected dc voltages.

To protect machinery from damage and to make the installation safer for personnel. The trip level can be set using the rotary switches on the front panel. One terminal of the relay coil is connected to the metal body of the equipment to be protected against earth leakage and other terminal is connected to the earth directly. Earth leakage relays perform two main functions on mining installations.

The ecm2 earth continuity relay performs the following functions. Earth continuity relays prefixed gcm. Voltage earth leakage circuit breaker the working principle of voltage elcb is quite simple. When short circuit between the pilot and earth cores in the trailing cable completes the circuit through the operating relay and if the pilot circuit were not to fail to safety such a fault would cause the motor to start immediately.

Earth continuity relay the ampcontrol earth continuity relay ensures safety and as nzs2081 compliance through a new method of earth continuity protection that uses a trip curve to discriminate between earth disconnection faults and incremental increases in the earth return impedance that occurs due to equipment degradation. The rob earth continuity relay has been designed to as 2081 2 1988 to monitor the earth continuity of a trailing cable in an underground mining operation.