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Unusual cable?

AncientMariner
Some people collect stamps, I collect cable. Preferably as short encapsulated paperweights, although I do have others, such as a piece of TAT1 and a piece of the original transatlantic telegraph cable of 1866.


One of my paperweights is a 6-core lead covered cable, each core 0.125 sq. inches copper rated at 11,000 volts WP (which I guess is Working Pressure which translates to Working Voltage) It was produced for the City of Sheffield by the Western Electric Company London. No date given.


Why use a 6-core cable? Seems to be putting all ones eggs in one basket if used for a two circuit system. Had it been for a lower voltage, then perhaps an ac feed to a mercury arc rectifier, but surely not at 11 kV?

Clive
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    Apart from the obvious twin 3 phase HV circuits - rather like a modern 6 arm 'pylon'..

    0.125 squin  is close to modern 70mm2 , perhaps 200-300A per core depending on what we assume about insulation temperature. (so something like  5MW per triplet, 10MW for the whole cable, if we assumed modern  11kV phase to phase, 6kV to ground)


    Could have been 4 cores for 3 phases and earth and a DC supply or pilot - Sheffield had DC trams until about 1960 Or perhaps it pre-dates AC mains altogether  and just happens to be rated at 11kV but used for DC centre ground at 400/200/0 /-200 /-400 ?

    Mike

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  • 0
    Apart from the obvious twin 3 phase HV circuits - rather like a modern 6 arm 'pylon'..

    0.125 squin  is close to modern 70mm2 , perhaps 200-300A per core depending on what we assume about insulation temperature. (so something like  5MW per triplet, 10MW for the whole cable, if we assumed modern  11kV phase to phase, 6kV to ground)


    Could have been 4 cores for 3 phases and earth and a DC supply or pilot - Sheffield had DC trams until about 1960 Or perhaps it pre-dates AC mains altogether  and just happens to be rated at 11kV but used for DC centre ground at 400/200/0 /-200 /-400 ?

    Mike

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