Recent content by stadimet

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    How to calculate a Diesel Prime mover capacity when a driven Generator rated output power is known

    Hi, I want to know as to how do someone calculate the Diesel Prime mover capacity when the Generator rated output power is known which is driven by it. Are there some rules or thumb rules or an International standard. Please point it out to me so that I can use the same to check. -- Regards...
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    Why do ships mostly use 3 phase 3 wire systems?

    Dear CSA, Can you throw some light in [1] below. I understand you have good ship building experience. >[1] In the past 23 years of my service, I have only seen >every ship being built in my yard with 3 Phase, 3 wire >system with the neutral isolated. why is it that 3 phase 4 >wire not...
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    Where should the feedback of AVR be taken in a synchronous generator?

    Hi all, Where should the Feedback for an AVR be taken in a Synchronous Generator? This is a shipboard generator which has an Electronic Automatic AVR installed. The AVR takes its feedback (voltage) from the generator itself and not from the Switchboard Busbar to which the Generator wiring...
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    Why do ships mostly use 3 phase 3 wire systems?

    Actually there are insulation monitors int he switchboard and these are programmed to give Audio visual alarms. Next what do you think is the effect of using a local D/Y Transformer ( for the Galley) on the system in terms of defeating this protection or in terms of any circulating currents...
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    Why do ships mostly use 3 phase 3 wire systems?

    Hi all, I have the following doubts: [1] In the past 23 years of my service, I have only seen every ship being built in my yard with 3 Phase, 3 wire system with the neutral isolated. why is it that 3 phase 4 wire not used on a ship like in a land based power system? [2] Earlier we used...
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    Voltage Drop Between Generator and Main Switchboard on an Ocean Going Vessel

    [1] A new 1.2 MW, 415V, 50 Hz diesel generator has its voltage dropped between its TB and Main switchboard, by more than 6 V (415 down to 409 V) at 100% Resistive load (P.F=1.0). [2] The distance between the Generator and the MSB is 129 Mtrs. Single core cables of 1x240 sq mm - each 6 runs...
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