Transformer protective apparatus having semiconductor and mechan

Details Transformer protective apparatus having semiconductor and mechan Transformer protective apparatus having semiconductor and mechan

1996-06-11

1998-09-29

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

361 36, 361100, 361102, H02H 7125, H02H 7045

Patent

active

058153870

ABSTRACT:
A power converter protective apparatus for protecting an AC-DC converter against an excess fault current by preventing the fault current of a power system from flowing into the AC-DC converter. The protective apparatus comprises a series transformer, whose primary winding is connected in series with a power system and whose secondary winding is connected to a voltage-type AC-DC converter, first current bypass means of a normally open-type connected in parallel with the primary winding, a current transformer for detecting a fault current in the power system, and a control unit for outputting a bypass control signal to the first current bypass means when the current transformer detects the fault current, whereby when the fault in the power system is detected, a fault current flowing through the primary winding is bypassed by the first current bypass means.

REFERENCES:
patent: 3590319 (1971-06-01), Baltensperger
patent: 4438474 (1984-03-01), Paice
patent: 4922364 (1990-05-01), Paulsson
patent: 5206775 (1993-04-01), Wilson
patent: 5309346 (1994-05-01), Gyugyi
patent: 5392184 (1995-02-01), Unterlass et al.
patent: 5537283 (1996-07-01), Keese

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