Earth Continuity Relay Theory

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.

Earth continuity relay theory.

Ensures that there is an earth return path from the machine back to the substation and or distribution box. The relay is housed in a sprecher schuh enclosure with three led indicators. The relay has been approved to be intrinsically safe and is suitable for use in zone 1 or 2 hazardous areas. The trip level can be set using the rotary switches on the front panel.

The ecm2 earth continuity relay performs the following functions. In fact if the motor was running it would become impossible to stop it using the pilot switch. To protect machinery from damage and to make the installation safer for personnel. Earth leakage relays perform two main functions on mining installations.

In the typical distribution circuit shown in fig 1 an earth leakage relay provides protection against leakage to earth and earth faults. 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 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. The ic3 utilises microprocessor technology to provide a greater level of stability over longer pilot cables by using digital filtering techniques.

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. Voltage earth leakage circuit breaker the working principle of voltage elcb is quite simple. Earth continuity relays prefixed gcm. Ampcontrol remains at the top of the field for innovation in earth continuity protection relay design.

The loop resistance is constantly indicated on a 7 segment lcd display. This relay is micro processor controlled and can withstand high induced ac voltages and injected dc voltages.