Method and apparatus for interrupting large current

Details Method and apparatus for interrupting large current Method and apparatus for interrupting large current

1976-03-23

1977-11-01

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 2, H02H 722

Patent

active

040568369

ABSTRACT:
Large current is interrupted against high voltage by a high speed mechanical opening line switch connected in series with a saturable reactor. A commutation capacitor is discharged through the closed switch against the line current to produce a current zero. Near the time of current zero the line switch is opened to produce arc free interruption. A dV/dt capacitor is paralleled around the switch to limit the rate of voltage rise. High contact speed of the line switch limits the size of the required dV/dt capacitor to what can be justified economically.

REFERENCES:
patent: 3390305 (1968-06-01), Greenwood
patent: 3489918 (1970-01-01), Greenwood et al.
patent: 3489951 (1970-01-01), Greenwood
patent: 3548256 (1970-12-01), Barkan et al.
patent: 3781606 (1973-12-01), Long et al.
patent: 3868550 (1975-02-01), Knauer et al.
patent: 3912975 (1975-10-01), Knauer et al.
patent: 3935509 (1976-01-01), Eidinger
IEEE Paper T72 107-6, Printing Date Nov. 30, 1971, pp. 1570-1574, "Theory and Application of the Commutation Principle for HVDC Circuit Breakers" by Greenwood and Lee.

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