What is ELCB(rcd) testing
An RCD is a protective device used to automatically disconnect the electrical supply when an imbalance is detected between live conductors in a Three Phase Circuit. In the case of a Single Phase circuit, the device monitors the difference in currents between the line and neutral conductors.
RCD and ELCB Testing is done by simulating an appropriate fault condition – by injecting a low magnitude fault current say 30 to 200 mA to test whether the device/breaker will trip. This Electrical test is recommended since any test facility or test button, incorporated into the device can check only the mechanical operation of the breaker.
- Breaker Functional Test
- Current Injection Method – mAmps
- Identifies Breaker Health
- Healthy Breaker will trip the circuit during Current Injection Test.
Protective relays, also called protection relays, prevent unnecessary trips, isolate faults, protect transformers, breakers & motors and provide electrical system information.
With usage, the connections of relay get deteriorated or contaminated with carbon particles, etc. Since these are critical protection equipment, it is the interest of the end user to check the healthiness and behavior of relays periodically through a secondary current injection method.