Load switching between PDB feeder and a standby Alternator

Discussion in 'The Projects Forum' started by etech7, Dec 7, 2015.

  1. etech7

    Thread Starter New Member

    Jun 9, 2015
    29
    0
    I am working with one of my friend's project. Who requested me to find out the appropriat circuit diagram for this.

    The goal of this project is satisfying the following tasks:
    1. Connect the loads to the PDB supply when supply is available on PDB.
    2. When supply failure occur on PDB line, start up the standby 3 phase alternator automatically and switch the loads to the alternator.


    I have given here the developed ladder diagram designed by me. I am using relay, magnetic contactor and timer for this propose. But one problem is that I noticed here, when power failure will occur, the timer will be no longer getting the supply. I am looking for any kind of help, recomandation, or even better practical circuit diagram for this project. I will be thankful if anyone can help me. :)
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    What's PDB.
    Where do the contactors and relay get their supplies from.?
     
  3. etech7

    Thread Starter New Member

    Jun 9, 2015
    29
    0
    PDB stands for Power Development Board. PDB is government organisation that manage generation, transmission and distribution of electrical power.
    These relays and contactors are getting thier supply from, parhaps, PDB. By the way, this is not for apply. It's just a collage demo project for change over switching.
     
  4. etech7

    Thread Starter New Member

    Jun 9, 2015
    29
    0
    PDB stands for Power Development Board. PDB is government organisation that manage generation, transmission and distribution of electrical power.
    These relays and contactors are getting thier supply from, parhaps, PDB. By the way, this is not for apply. It's just a collage demo project for change over switching.
     
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