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A system is disclosed for monitoring and controlling the consumption of electrical energy and the peak demand for electrical power in an installation. The system can be programmed to automatically limit the instantaneous power consumption of the installation in accordance with the time of day and th

A system is disclosed for monitoring and controlling the consumption of electrical energy and the peak demand for electrical power in an installation. The system can be programmed to automatically limit the instantaneous power consumption of the installation in accordance with the time of day and the required need of the facility. The system sheds appropriate individual loads when the total instantaneous power consumption exceeds the pre-selected set point applicable for the time in question, to thereby return the power consumption of the installation to within this allowable limit. Provision is made for selective load shedding whereby the relative size of the load shed corresponds with the relative degree of power overdraw. In addition, after each shedding event, the system automatically realigns the order of priority by which the loads are shed. Furthrmore, all shed loads are automatically reset to an operative condition on a periodic basic, according to the operating requirements of each load.

대표청구항 ▼

A system for monitoring and controlling the electrical amperage draw of an installation supplied by an electrical supply line, said installation having therein a number of individual loads to be controlled, comprising: a supply line sensor coupled to the electrical supply line for generating a suppl

A system for monitoring and controlling the electrical amperage draw of an installation supplied by an electrical supply line, said installation having therein a number of individual loads to be controlled, comprising: a supply line sensor coupled to the electrical supply line for generating a supply line sensing signal proportional to the amperage flowing in the supply line; an allowable load set point indicator for designating the maximum allowable amperage draw, and for receiving said supply line sensing signal from said supply line sensor, to generate an overdraw signal whenever the amperage flowing in the supply line exceeds the maximum allowable amperage draw; control means for receiving the overdraw signal from said allowable load set point indicator for generating a shed signal directing the shedding of particular individual loads so as to decrease the electrical amperage draw of the installation; a load shedding circuit electrically connectable to the individual loads for receiving said shed signal from said control means and for disconnecting said particular individual loads, said load shedding circuit including a shed priority control circuit for changing the shedding sequence of the individual loads on different shed cycles following occurrence of said overdraw signal; and a timer for controlling the period during which individual loads are shed, said timer being connected to said load shedding circuit for re-connecting individual loads after being disconnected for predetermined time intervals to thereby create an overdraw to initiate a new shed cycle and the shedding of a different load.