I hope you read & understood what all they said cos I, as a seafarer, having been through hundreds of electric storms, frankly did not. When earth fault occurs, the electrical system gets short-circuited and the short-circuited current flows through the system. This monitor are installed in ship engine room control panel, where all engineers can easy observe it condition. If the ship is having IAS (Integrated Automation System), check on the computer in the list of events after which the alarm has activated. • A ship is an autonomous system that does not require an external supply over a long period of time ... active conductors and earth. Earth Fault is an inadvertent fault between the live conductor and the earth. 11.8 Effect of system earthing methods on earth fault current magnitude. The location of fault can be traced by switching off the individual branch circuit breaker and check the condition of earth lamp. Earth fault occurs when charge flows into the Earth. I can see that you have got some really profound answers to what is actually a simple question. Preventing this has been one of the major concerns to people working in this field. In the event of an insulation fault, the insulation fault R F closes the measuring circuit generating a measuring current If IAS facility is not available, there is only one option of isolating each and every machinery in the 440 V circuit and check whether the earth fault indication returns back to normal. Nasser Tleis BSc (Hons), MSc, PhD, CEng, FIET, M-CIGRE, in Power Systems Modelling and Fault Analysis (Second Edition), 2019. However when the operating voltage exceeds 3000V, it is mandatory to have a protection system which isolates when a machinery suffers an earth fault. Go back to Index ↑ Some ships which operate at 440 V do not have any trip devices attached for a single earth fault. Every now and then, accidents caused by electrical incidents injure many people. When the branch circuit with the fault is switched off, the earth lamp will return to normal brightness. Go back to Index ↑ Solidly earthed neutral. This is similar to resistance-earthing at the transformer, but the capacitive currents are negligible compared to the fault current, so the protection function is simpler to implement. Onboard a ship, the priority requirement is to maintain continuity of the electrical supply to essential equipment in event of a single earth fault occurring. The priority requirement ashore is the immediate isolation of earth-faulted equipment which is automatically achieved by an earthed system. If excess amount of charge is flowing through a circuit, an earth fault is introduced so that the Directional earth fault protection can be used to selectively trip the fault feeder. Earth Fault An Earth Fault is due to a break in the insulation, as at B (Fig) allowing the conductor to touch the hull or an earthed metal enclosure. Effect:- An earth fault provides an easy path for current to flow through the wires and earth How to find:- Check the resistance Between terminal and earth. Earth fault is considered very critical on board a ship. The earth fault monitor can be either three set of indicator lamps with gauge or an instrument (always calibrated in maga ohms or kilo ohms) to show the system IR value to earth fault. An earth fault current is a current that flows to earth and has a magnitude that depends on the method of system earthing. Generally two types of earth fault indicators are fitted onboard, Earth fault indication Lamps and An instrument showing Insulation with respect to the earth … If earth fault occurs the lamp will show dim light or goes out because potential is zero. Earth Fault Indicators Ships 440V and 220V isolated system should have insulation indicators in order to indicate the presence of earth fault in the system. 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