industry transformers

Discussion in 'Homework Help' started by amilton542, Dec 6, 2010.

  1. amilton542

    Thread Starter Active Member

    Nov 13, 2010
    why do heavy industry have there own transformers? would it not be easier to provide them with a 400v supply
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    It saves the supply authority having to run very heavy conductors to the consumer.

    Say a consumer has a 12MW 3-phase peak load, then the 400V line current at unity pf would be 10kA. Quite a fat conductor required for that.

    At 11kV line voltage (say) the supply side (primary) transformer line current under the same conditions would be a modest 364A.
    amilton542 likes this.