FAST TRANSIENT MITIGATOR CIRCUIT INTEGRATED WITHIN A VACUUM CAST TRANSFORMER

摘要

A transformer (10) includes a ferromagnetic core (14); winding structure (12) mounted on the core; electrical terminals (40, 40') connected to the winding structure; a fast transient mitigator circuit (52) including an impedance circuit serially connected between one of the terminals and the winding structure, and a capacitor connected from the one terminal to external ground. The mitigator circuit is constructed and arranged to reduce a frequency spectrum and magnitude of fast transients. An encasement (16), of an insulating resin, encapsulates the core, the winding structure and at least the impedance circuit of the mitigator circuit.