Electrical transmission or interconnection systems – Plural load circuit systems – Control of current or power
Patent
1982-08-09
1985-01-15
Shoop, William M.
Electrical transmission or interconnection systems
Plural load circuit systems
Control of current or power
315195, 315297, 323267, H02J 300
Patent
active
044940106
ABSTRACT:
An apparatus especially adapted for use in AC power systems of the type having a device for reducing power consumption by reducing load voltage, the apparatus having a sensor for detecting an increase in load current and for controlling a responsive increase in load voltage to compensate for the added load causing the increase in current. The apparatus can be used in three-phase AC systems for controlling each phase independently and can be made sufficiently sensitive to operate in a 28,000 Watt fluorescent light load while responding to as little as 400 Watt load additions to assure quick and efficient ignition of newly turned-on lights. A digital memory device, in the form of a state machine in the preferred embodiment, is used to control operation and timing for one to three phases while permitting low line voltage override and periodic timing override operation. The invention may be used advantageously with any type of load, but it is especially useful for lighting loads where there is a non-linear relation between power delivered and light level emitted such as fluorescent or neon lights.
REFERENCES:
patent: 3339079 (1967-08-01), Kessler
patent: 4316136 (1982-02-01), Saxarra et al.
Shoop William M.
Standum Controls, Inc.
Tachner Leonard
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