Electrical transmission or interconnection systems – Plural load circuit systems – Control of current or power
Patent
1999-02-11
2000-08-01
Jackson, Stephen W.
Electrical transmission or interconnection systems
Plural load circuit systems
Control of current or power
315294, H02J 100
Patent
active
060971088
ABSTRACT:
An apparatus and method for controlling events taking place at a facility participating in a power control program prior to a transfer of electrical power supply by the open transition transfer method. Neither notification nor time delays are currently available to facilities participating in power control programs of this sort. The apparatus is a controller that provides notification to the facility that the load-shedding event is about to occur by a system of alarms, and enables it to provide a time delay during which it may prepare for the transfer between its primary power source and its secondary power source. Such preparation may include the testing of its secondary power source located on site of the facility, usually a generator, and allows time during which it may be repaired if need be. It may also include the shut down of sensitive equipment and processes, such as computers and computerized equipment, which would be corrupted or otherwise damaged by the momentary loss of power inherent in the open transition method of transfer. The controller is connected serially to a utility company's remote signal relay box and the transfer switch controlling the transfer of power supply between the primary and secondary power sources. The controller comprises control logic circuitry consisting of a programmable logic controller and includes an uninterruptible power supply connected to the programmable logic controller to ensure its fail-safe operation should the main power fail. The programmable logic controller may be variably configured and programmed to fit the needs of the particular facility. It controllably produces command signals in response to various input conditions including those controlling time delays, warning alarms, the automatic shutdown of sensitive equipment and processes, and the activation and testing of the secondary power source.
REFERENCES:
patent: 4731547 (1988-03-01), Allenduff et al.
patent: 5085287 (1992-02-01), Utsumi et al.
patent: 5422808 (1995-06-01), Catanese, Jr. et al.
Forward Electric, Inc.
Henry Anore
Jackson Stephen W.
King Patricia Smith
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