UNDERGROUND LOW VOLTAGE POWER DISTRIBUTOR AND CONTROL METHOD THEREOF

摘要

PURPOSE: An underground low voltage power distributor and a control method thereof are provided to determine a ground fault by detecting N-phase current at each branch. CONSTITUTION: A main circuit breaker(10) comprises a communication unit and an air circuit breaker having a diagnostic controller. A distribution breaker is electrically connected to the main circuit breaker and includes a plurality of distribution breakers for power distribution circuit. A branch bus bar(40a-40c) electrically connects the main circuit breaker and the distribution breaker. The branch bus bars are arranged in R,S,T phase and is also arranged in N phase respectively. The branch bus bar(50a-50d) supplies power to a load from the distribution breaker for the power distribution circuit.