Control circuit system of card-type kilowatt-hour meter

Control circuit system of card-type kilowatt-hour meter

  • CN 1,139,817 C
  • Filed: 07/09/1999
  • Issued: 02/25/2004
  • Est. Priority Date: 04/23/1999
  • Status: Active Grant
First Claim
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1. , a kind of control circuit system of card-type kilowatt-hour meter comprises a card-type kilowatt-hour meter, an isolating switch and the neutral line, the phase line of drawing from AC power;

  • Isolating switch comprises;

    go up lower connecting terminal, contact apparatus, arc-control device, tripper, bimetallic element, magnetic trip gear;

    The described neutral line, phase line are connected to isolating switch through card-type kilowatt-hour meter, and the output terminal of isolating switch is connected to the user;

    It is characterized in that;

    Be connected with a control signal wire between watt-hour meter and the isolating switch;

    Isolating switch also comprises a control circuit and a thermal sensitive ceramics element;

    In the isolating switch, upper connecting terminal, contact apparatus, bimetallic element, magnetic trip gear and lower connecting terminal connect successively;

    The two ends of tripper are connected with magnetic trip gear and contact apparatus respectively;

    Arc-control device is connected to contact apparatus;

    Control signal wire is connected to control circuit;

    Control circuit connects the thermal sensitive ceramics element;

    Wherein, in the described watt-hour meter, the neutral line and phase line are directly passed respectively;

    One end of signal wire connects phase line, the normally open contact of one first relay of other end serial connection;

    Be provided with one second relay in the control circuit;

    The thermal sensitive ceramics element is fixed on the bimetallic element, and the thermal sensitive ceramics element is connected in series with a normally closed interlock of second relay, and is connected across on the neutral line and phase line of user side.

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