Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1983-01-13
1984-07-31
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 9, 361 11, 307134, 307135, 363 35, 363 51, H02H 722
Patent
active
044634005
ABSTRACT:
An apparatus for the interruption of DC transmission lines without substantial arcing utilizing in combination a DC circuit breaker, a DC-to-AC current converter, converter control and an AC power sink. Upon command from the converter control, DC current is converted to AC current in the current converter and is then magnetically coupled via a transformer into the AC power sink; thus, drawing power out of the DC transmission line and reducing the DC current toward a zero value at which point the DC breaker can be opened without substantial arcing. Various single and multi-phase converter circuits utilizing thyristors are employed. A bypass switch in parallel with the converter can be provided to pass the DC current around the converter during normal operation of the DC transmission line to minimize electrical losses. Alternatively in multi-phase converters, normal DC current can be multiplexed among the phases of the current converter in order to distribute the heating caused by the conduction of DC current therethrough. Interruption of DC transmission lines having bidirectional DC current flow is accomplished with alternate embodiments of the invention including current converters in a back-to-back parallel arrangement, or a current converter full wave bridge rectifier combination or a current converter connected to the DC transmission line via polarity reversing switches.
REFERENCES:
patent: 3543045 (1970-11-01), Hammarlund et al.
patent: 3600662 (1971-08-01), Anwander
patent: 3651374 (1972-03-01), Faust
patent: 3670176 (1972-06-01), Faust
patent: 3714452 (1973-01-01), Williamson
Paice Derek A.
Wood Peter
Pezdek John Victor
Salce Patrick R.
Westinghouse Electric Corp.
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