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    suniljayarajan's Avatar
    suniljayarajan Posts: 10, Reputation: 1
    New Member
    		  
    #1

    May 23, 2009, 03:14 AM
    About Transformer
    I want to give 3 indication to a panel
    Who's supply voltage is 480V
    But indication blub is of 110v
    I have 3 transformer to convert it in to 110
    But how can I get the wiring to indicate the lamp
    I have tried many type but not getting
    If I connected in transformer delta-detla i.e. primary and secondary
    When one phase gone the indication of 2 light will be dim
    Please help me to solve this solution
    jerro's Avatar
    jerro Posts: 172, Reputation: 5
    Junior Member
    		  
    #2

    May 23, 2009, 04:21 AM

    What are you trying to get the lamps to indicate?
    sathe1963's Avatar
    sathe1963 Posts: 97, Reputation: 4
    Junior Member
    		  
    #3

    May 24, 2009, 08:44 AM

    We understand that your supply voltage 480 volts is phase to phase voltage. Check for your individual transformer output voltage whether is 110V between two leads or it 63.5 Volts? It it is 110V between two leads; connect each lead of the transformer to ground (Check polarity of the transformer). Now, your have got 3 leads connected to ground and 3 leads open. Connect these three leads 1 each to each lamp. Second terminal of all lamps to be connected to ground. (Let the transformer be Start / Star connected and the lamps also star connected.)
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