FAULT CURRENT LIMITER
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United States of America Patent
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Issued Date -
Oct 18, 2012
app pub date -
Apr 13, 2011
filing date -
Apr 13, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A three-phase fault current limiter FCL has three spaced apart input terminals for electrically connecting to respective terminals of a transformer. Three output terminals electrically connect FCL with a load circuit which draws load current ILOAD. FCL includes two longitudinally spaced apart generally circular High Temperature Superconducting (HTS) DC coils which have central generally cylindrical cavities. FCL also includes a longitudinally extending magnetically saturable core which has six like coextensive parallel and elongate posts. Each post includes a first longitudinal portion and, a second longitudinal portion and a third longitudinal portion extending longitudinally oppositely away from the first portion. Each second portion and third portion is received within one of the central cavities. Three copper-based insulated AC coils are each wound about respective first portions for carrying load current ILOAD between input terminals to respective output terminals. DC coils magnetically bias the core such that, in response to one or more characteristics of the load current ILOAD, the AC coils move from a low impedance state to a high impedance state.
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