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Any Ideas ??????????

Discussion in 'Beginner Electronics' started by scada, Jun 12, 2004.

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  1. scada

    scada Guest

    I would start with a current transformer. One of the feed legs passes
    through the center of the CT then the secondary of the CT goes to the
    monitoring circuit which could be as simple as a current relay. A more
    accurate circuit could be made using a suitable load resistor on the
    secondary and measuring the voltage drop across the resistor, the amplitude
    of the voltage corresponds to the load current. A simple comparator circuit
    could determine the alarm point. Just remember to ALWAYS LOAD THE SECONDARY!
    An open CT secondary will produce high voltages that can destroy both the CT
    and anyone in its path!!!
  2. WJF

    WJF Guest

    I am trying to locate or help with a circuit that will monitor the current
    on a mains cable and sound a short alarm should the current change. The
    basic idea is for remote monitoring of a set of PIR controlled security
    lights up to 10 seperate units at 500W each. I don't want to run a seperate
    cable for each sensor so I thought this could be one solution. Any help or
    ideas would be apreciated thanks for reading this post
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