Electricity: power supply or regulation systems – For reactive power control – Using impedance
Patent
1980-03-20
1982-02-23
Shoop, William M.
Electricity: power supply or regulation systems
For reactive power control
Using impedance
G05F 170
Patent
active
043170765
ABSTRACT:
A control system for automatically adding and subtracting capacitors to and from an electrical supply line for regulating the power factor of the supply line. A three-phase transducer is connected to the supply line and supplies a signal in direct proportion to the VARs of the supply line to a double setpoint meter relay. The meter relay is connected to a pair of timing relays which are selectively energized in response to a capacitor "add" or "subtract" signal from the transducer. If the signal is maintained for a predetermined period of time on one of the timing relays, a motor of a respective "add" or "subtract" cam-actuated switch is activated. The cam switches are programmed to energize or deenergize control relays, which in turn actuate capacitor contactors to add or subtract the next available capacitor. The cam switches are in independent circuits so that the cycling of each capacitor is in a next-one-available cycle, whereby the first capacitor added is the capacitor which was removed the longest from the supply line, and the first capacitor removed is the capacitor which has been energized the longest. This sequence provides uniform usage of all the capacitors and the associated controls.
REFERENCES:
patent: 2293484 (1942-08-01), Anderson
patent: 3002146 (1961-09-01), Lorrig et al.
patent: 3084323 (1963-04-01), Sommer et al.
patent: 3300712 (1967-01-01), Segsworth
patent: 3391329 (1968-07-01), Meyer
patent: 3489882 (1970-01-01), Krackow
patent: 3529173 (1970-09-01), Verma
patent: 3787729 (1974-01-01), Bennett
patent: 4055795 (1977-10-01), Mathieu
Hilscher-Clarke Electric Co.
Shoop William M.
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