Method and system of transformer protection and method and syste

Details Method and system of transformer protection and method and syste Method and system of transformer protection and method and syste

1990-01-18

1992-12-08

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 79, H02H 704

Patent

active

051703084

ABSTRACT:
A method and system of transformer protection in which parallel admittance currents indicative of the apparent excitation state of a transformer to be protected are evaluated from the transformer terminal voltages and currents sampled at a proper interval, and discrimination between an internal defect and excitation inrush is made in response to a magnitude of the parallel admittance current, and a breaker opening command is issued in response to a judgement of internal defect. The method and system enables high-accuracy and high-sensitivity fault detection through a simple computation.

REFERENCES:
patent: 4772978 (1988-09-01), Oura et al.
patent: 5014153 (1991-05-01), Wilkerson

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