Fault Current Limiter
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United States of America Patent
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Issued Date -
Nov 28, 2013
app pub date -
Sep 27, 2010
filing date -
Sep 25, 2009
priority date (Note) -
Abandoned
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Abstract
A three phase fault current limiter (FCL 6) has three spaced apart input terminals (7) for electrically connecting to respective terminals (5) of a transformer (2). Three output terminals (8) electrically connect FCL (6) with a load circuit (9) which draws load current ILOAD. FCL (6) includes a multi-post magnetically saturable core (11) and three AC coils (12, 13 and 14) for electrically connecting terminals (7) to respective terminals (8). Coils (12, 13 and 14) allow ILOAD to flow from a power station (4) to circuit (9). Coils (12, 13 and 14) include respective pairs of series connected high voltage cables (15a and 15b, 16a and 16b and 17a and 17b) wound about core (11). Two generally triangular spaced apart DC coils (19, 20) induce a magnetic field in at least that portion of core (11) about which the cables are wound. The field magnetically biases core (11) such that coils (12, 13 and 14) individually move from a low impedance state to a high impedance state in response to ILOAD approaching IMAX.
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