Automatic Reset Residual Current Circuit Breaker With Identification Of Fault Condition

Lim , Swee Ann (2010) Automatic Reset Residual Current Circuit Breaker With Identification Of Fault Condition. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Residual current circuit breaker (RCCB) is a circuit breaker that detects the unbalance current of phase and neutral conductor. Unbalance current can be caused by current leakages through the body of a person or phase short to the ground wire (circuit protective conductor, extraneous conductive part or exposed conductive part) and produce earth fault. At residential, RCCB will trip instantaneous when earth fault or current leakage occurs at the appliances. Normally, this type of RCCB would not automatically reset by itself after the fault has been cleared whereby it require manual reset by a person. Thus, this project is done to propose a system that able to automatically reset the RCCB in the distribution board at residential. The automatic reset system is designed using the similar concept of auto-recloser at the transmission line. This automatic reset system will identified the fault by using the similar concept of continuity test concept to ensure the system is safe to be reset automatically. The continuity test can provide sufficient information about fault condition due to short circuit or earth fault by measuring the resistance of cable insulation. Therefore, at the end of this project it is expected that the proposed automatic reset RCCB is able to give significant result in identifying the faulty condition and automatically reset the RCCB safely.

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