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Ground Detector Circuit

Discussion in 'Electrical Engineering' started by J.B. Wood, May 1, 2012.

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  1. J.B. Wood

    J.B. Wood Guest

    Hello, everyone (especially current or former USN Electrician's Mates).
    As some of you probably know the U.S. Navy uses ungrounded shipboard
    A.C. power distribution in order to ensure "battle short" availability
    of on-board electronic equipment. In Fig. 3-13 of USN training manual
    14344 (available as a downloadable pdf at
    http://ebookbrowse.com/navedtra-14344-electrician-s-mate-pdf-d60422134)
    is a simple circuit for determining whether a fault condition (short to
    ship hull) exists on any phase of a 3-phase system. My question is what
    is the purpose of hull grounding of the midpoints of the transformer
    secondaries in Fig 3-13? Thanks for your time and comment. Sincerely,
     
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