Automatic Circuit Breaker (ACB) for Low Voltage Substation Distribution System

Abstract

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An automatic circuit breaker (ACB) is a device that acts on the occurrence of short circuits in power supply network. When a condition of contact division occurs, the extinction creates an interruption of current at a current's high arc. At fault current zero passage, an arc is initially interrupted. The transient recovery voltage (TRV) recovering contact gap gives an adverse impact on dialectical of the network. By using current-limiting fuse (CLF) method, the usage of the over current can be easily reduced by clearing time at rated voltage to an interval equal. Two types of breaker models were used in the simulation design for comparison of the I-V graph. The protective relay was used in the design to detect and evaluate the fault. It also determined either to open or close the dedicated circuit. The system was simulated in one condition using two types of breaker models and their effects were observed. Analysis and evaluation of the automatic circuit breaker showed that this system was able to cut the over current limit and has the potential to prevent the usage of electrical energy due to the fault occurred.