Marine Engineering

Earth fault is considered very critical on board a ship. Some ships which operate at 440V do not have any trip attached for a single earth fault. However when the operating voltage exceeds 3000V. It is mandatory to have protection system which isolates when a machinery suffers an earth fault. The seriousness of the action to be taken on an Earth fault depends on the part of the electrical system it affects. Conventional ships which operate on 3 Phase, 440V have earth fault indicators installed on all three phases. Any earth fault on a 440V system is considered to be a serious trouble and immediate action is required to identify the faulty circuit. Any earth fault on 220V or any low voltage lighting circuit can be considered as important but need not required immediate attention. However, attention should be paid at the next earliest opportunity. Finding Earth Fault on 440V circuit Whenever there is an earth fault alarm, immediately inform to electrical officer. First act...