Power factor correction system

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.

Dependencies are inferred from the claim text.