Electrical changeover switching

Details Electrical changeover switching Electrical changeover switching

1994-05-04

1997-02-18

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a transformer or inductor as the final control device

G05F 120

Patent

active

056044240

ABSTRACT:
A changeover switch for a tap changer including a pair of load switches. A diverter switch allows load to be diverted along a second path when its associated main switch is opened or closed. An auxiliary circuit has an auxiliary switch and a varistor connected in parallel across the secondary of a transformer. When the auxiliary switch is opened the varistor impedance is reflected onto the primary of the transformer which causes the current in the main switch to divert through the diverter switch so that the main switch can be opened or closed with substantially no load on it.

REFERENCES:
patent: 1893760 (1933-01-01), Boyajian
patent: 1914193 (1933-06-01), Bedford
patent: 1947292 (1934-02-01), Garman
patent: 3515980 (1970-06-01), Throop
patent: 3662253 (1972-05-01), Yamamoto
patent: 3743921 (1973-07-01), Legg et al.
patent: 4622513 (1986-11-01), Stich
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"Transient Stability Improvement Using Thyristor Controlled Quadrature Voltage Injection" (Arnold et al) IEEE Trans. vol. PAS-100, No. 3, Mar./1991 (pp. 1382-1388).

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