Electricity: power supply or regulation systems – Remote sensing
Patent
1976-04-27
1977-12-06
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
H01F 2904
Patent
active
040619630
ABSTRACT:
A load tap changer system for electrical power transformers, including protective apparatus which prevents a tap change in the event of a malfunction during a tap change cycle. The protective apparatus includes a relay and a current responsive device for operating the relay when current is flowing at a location prior to a tap change which would not have current flow during a normal tap change cycle. Current applied to the relay is maintained within the operating range of the relay by a tapped transformer operated by the tap changer drive.
REFERENCES:
patent: 3395327 (1968-07-01), Kaiser et al.
patent: 3602807 (1971-08-01), Prescott
patent: 3622867 (1971-11-01), Topper et al.
Lackey D. R.
Pellinen A. D.
Westinghouse Electric Corporation
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