Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1985-10-11
1989-08-22
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
323257, 323258, H02H 700
Patent
active
048601454
ABSTRACT:
A protection circuit is provided for a tap switching line voltage regulator of the type which selectively switches in one of a predetermined number of taps on a winding of a transformer. The selective switching of the taps is controlled in response to the sensed load voltage to provide a regulated voltage to a load in the presence of a varying input line voltage. The tap switching line voltage regulator in response to the sensed load voltage controls the conductive state of a solid state series switching element in each of the switched tap lines. The protection circuit provides current limiting inductors in series with each of the solid state switching elements with all the inductors being wound on a common magnetic core. When switching from one tap to another tap, the tap switching line volage regulator in response to the sensed voltage operates to select an adjacent tap to the tap currently selected. Thus, tap switching proceeds in a sequential fashion up and down along the taps. The series inductors are wound on the common magnetic core such that the direction of the windings alternates between adjacent taps. Accordingly, the protection circuit provides a current limiting impedance to circulating currents that is four times the impedance to normal load currents. Accordingly, the circulating current caused by leading or lagging power factor operation is limited to prevent damage to the solid state switching elements.
REFERENCES:
patent: 2112064 (1938-03-01), Blume
patent: 3263157 (1966-07-01), Klein
patent: 3308374 (1967-03-01), Kagawa
patent: 3422338 (1969-01-01), Philipps
patent: 3524990 (1970-08-01), Bajpai et al.
patent: 3530369 (1970-09-01), Thompson
patent: 3699358 (1972-10-01), Wilkinson
patent: 3706024 (1972-12-01), Wood
Oneac Corporation
Pellinen A. D.
Williams H. L.
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