Power factor correction system
First Claim
1. A power-factor correction system for reactive power control and concomitant power factor correction adapted to cooperate with a line supplying power at a given line voltage from power generating means to an inductive load via a given path, comprising in combination,reactive power compensation means in shunt with said line supplying power, and adapted to be connected in shunt with said inductive load, and includingfixed capacitance means, andvoltage applying means delivering a voltage of continuously variable magnitude in a stepless manner to said fixed capacitance means in response to any change in lagging reactive power consumed by said load so as to correct the magnitude of the power factor in said line supplying power to said inductive load to a predetermined correction value as a result of said power compensation means generating thereacross a compensatory reactive power in proportion to the square of said voltage of variable magnitude delivered to said fixed capacitance means so as to at least partly off-set said lagging reactive power, whereby power factor correction is optimized, yet not producing any transient.
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Abstract
A power factor correcting system for compensating a lagging power factor reactance for an electric load plurality fed from at least one pair of incoming service lines, comprising, in combination: capacitors for producing leading reactive power; a series transformer, having primary and secondary winding, the secondary winding being connected in series with affected power lines; a variable transformer fed from the service lines and feeding the primaries of the series transformer; the capacitor instrumentality being fed from the affected incoming power lines with a voltage which varies in magnitude as needed, being the sum of the power line voltage plus/minus the variable series transformer secondary voltage; with the variable transformer through feeding of the primaries of the series transformer causing the required voltage variability in the series transformer secondary and subsequently in the feeding voltage applied to the capacitor; sensing instrumentality to detect presence of lagging reactive power requiring compensation; automatic control instrumentality to actuate the variable transformer to vary the voltage in one direction or the other until it has reached a discrete magnitude resulting in a precise addition or substraction of the thus introduced leading reactive power which makes the power factor be corrected to the preset accurate value.
126 Citations
20 Claims
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1. A power-factor correction system for reactive power control and concomitant power factor correction adapted to cooperate with a line supplying power at a given line voltage from power generating means to an inductive load via a given path, comprising in combination,
reactive power compensation means in shunt with said line supplying power, and adapted to be connected in shunt with said inductive load, and including fixed capacitance means, and voltage applying means delivering a voltage of continuously variable magnitude in a stepless manner to said fixed capacitance means in response to any change in lagging reactive power consumed by said load so as to correct the magnitude of the power factor in said line supplying power to said inductive load to a predetermined correction value as a result of said power compensation means generating thereacross a compensatory reactive power in proportion to the square of said voltage of variable magnitude delivered to said fixed capacitance means so as to at least partly off-set said lagging reactive power, whereby power factor correction is optimized, yet not producing any transient.
Specification