Detecting and locating the fault in the distribution system of marine boats

In the early years of building the boats, the most important electrical issue on boats was just the use of electricity for lighting. With the growing growth of technology in the construction of the boats and due to the commercially and instructionally developed marine electrical equipment, the existence of a well equipped and reliable marine distribution system is inevitable. Three phase distribution system, three wires with no ground null (isolated null) due to low earth fault current and as a result of sustaintiality of functioning of vital devices such rudders , communication systems, radar etc is the best choice to feed the boats. But choosing this type of distribution system, there are some flaws along with the advantages. One of the drawbacks after system is that in the event of failure to detect single-phase fault and phase- to -ground fault, a short circuit fault occurred and the triggers protective relay and terminates the feeding of the critical loads resulting in making boats non-operational, Therefore the first fault must be identified and resolved before the second ground fault. In this paper a hybrid method using wavelet transformation for fault phase detection and zero sequence flow characteristics has been used to identify the fault feeder and fault section.