Earth Continuity Relay Theory

The trip level can be set using the rotary switches on the front panel.

Earth continuity relay theory. 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. The loop resistance is constantly indicated on a 7 segment lcd display. 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. Earth leakage relays perform two main functions on mining installations.

To protect machinery from damage and to make the installation safer for personnel. The relay is housed in a sprecher schuh enclosure with three led indicators. Earth continuity relay model ic3 the bramco ic3 earth continuity relay is designed to actively monitor the resistance of the pilot earth cir cuit in a supply cable by diode termination. 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.

Voltage earth leakage circuit breaker the working principle of voltage elcb is quite simple. The bramco electronics earth continuity relay model i c has been designed to monitor the continuity of the earth cir cuit in a supply cable by grounding the pilot core via a diode polarized positive to earth. Ensures that there is an earth return path from the machine back to the substation and or distribution box. Earth continuity relays prefixed gcm.

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. This relay is micro processor controlled and can withstand high induced ac voltages and injected dc voltages. 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 ic3 utilises microprocessor technology to provide a greater level of stability over longer pilot cables by using digital filtering techniques.

In fact if the motor was running it would become impossible to stop it using the pilot switch. The ecm2 earth continuity relay performs the following functions.