Earth Continuity Relay Theory

Earth continuity relays prefixed gcm.

Earth continuity relay theory. The relay has been approved to be intrinsically safe and is suitable for use in zone 1 or 2 hazardous areas. Ensures that there is an earth return path from the machine back to the substation and or distribution box. 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.

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. To protect machinery from damage and to make the installation safer for personnel. This relay is micro processor controlled and can withstand high induced ac voltages and injected dc voltages. Earth leakage relays perform two main functions on mining installations.

The ic3 utilises microprocessor technology to provide a greater level of stability over longer pilot cables by using digital filtering techniques. The trip level can be set using the rotary switches on the front panel. 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. 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. In the typical distribution circuit shown in fig 1 an earth leakage relay provides protection against leakage to earth and earth faults. The ecm2 earth continuity relay performs the following functions. The loop resistance is constantly indicated on a 7 segment lcd display.

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. Ampcontrol remains at the top of the field for innovation in earth continuity protection relay design.