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Load demand control system

  • US 4,283,635 A
  • Filed: 07/25/1979
  • Issued: 08/11/1981
  • Est. Priority Date: 07/25/1979
  • Status: Expired due to Term
First Claim
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1. In a load demand control system for limiting the total average electrical load, for a predetermined moving interval of time, to an installation having at least one large electric load device to be operated a portion of an interval of time, comprising,load demand control means having an input electrical power sensing means for sensing the input power to an installation and a plurality of load control circuits for selectively controlling various loads of the installation to shed loads when said input power exceeds a first predetermined value,timer control means selectively operated when the one large electric load device is to be operated, said timer control means comprising,first means for resetting said first predetermined value of said load demand control means to a second predetermined value to cause said load demand control means to shed loads to maintain the input power below said second predetermined value for a first predetermined time period, andsecond means adapted to be controlled by said timer control means to subsequently initiate operation of said large load device after said first predetermined time period for a second predetermined time period, whereby the total average input power for a predetermined moving interval of time is maintained at a minimum value.

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