Load demand control system

An improvement in a load demand control system having an input power sensing means for sensing the total electrical demand of an installation for maintaining the total average electrical power load over a predetermined moving interval of time below a predetermined value wherein upon the operation of a large electrical load for a portion of the time interval other loads having lower priority are shed,

• the improvement comprising,
• timer means operated upon the anticipation of a need of an operation of a large load to delay the energization of said large load for a selected time during a time period and to control the shedding of certain of the other loads at the beginning of said time period prior to the energization of said large load to maintain a low average power load after the large load is deenergized over the total interval of said time period.

In a load demand control system for limiting the total average electric load for a predetermined moving interval of time as determined by a power supplier for an installation having at least one large electrical load device to be operated for a total time period less than the predetermined moving interval of time, comprising,

• load demand control means for controlling a plurality of electrical loads in response to the total input power of an installation to maintain the average total power for a predetermined moving interval of time taken and any time at a minimum,
• timer control means operated on anticipation of the need of operation of the large electrical load device,
• said timer means first resetting a control point of said load demand control means to reduce the input electrical power use of the installation for a first period of time by shedding low priority electrical loads and then energizing said large electrical load device for a period of time less than said interval.