Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Patent
1992-07-07
1995-02-14
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transformer protection
361 38, 323329, 323360, H02H 704, H02J 306
Patent
active
053900642
ABSTRACT:
A current limiting method and apparatus for preventing fault overload in a utility power transmission system employs a high power, superconducting coil based pulse transformer for saturating the core of the utility power transformer thereby limiting its current carrying capacity. The utility transformer core is biased to a disadvantageous portion of its B-H curve. A fault condition is detected and as a result the superconducting coil is quenched thereby sending a high energy pulse of current into the utility transformer magnetic core. The core, while heating, does not exceed its capability to maintain a stable thermal condition while at the same time limiting the current being transformed from its input to output lines, until a transformer circuit breaker activates.
REFERENCES:
patent: 4262245 (1981-04-01), Wendt
patent: 4700257 (1987-10-01), Bekhaled
patent: 4894556 (1990-01-01), Hilal et al.
patent: 4907246 (1990-03-01), Kleiner
"Using a Small Hybrid Pulse Power Transformer Unit as Component of a High-current Opening Switch for a Rail Gun"; L. M. W. Leung, R. E. Bailey, and P. H. Michels, IEEE Transactions on Magnetics, vol. 28, No. 2, Mar. 1989.
American Superconductor Corp.
Gaffin Jeffrey A.
Leja Ronald W.
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