DC circuit breaker and method of commutation thereof

Details DC circuit breaker and method of commutation thereof DC circuit breaker and method of commutation thereof

1987-10-14

1989-02-14

Hix, L. T.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 13, H02H 300, H01H 930

Patent

active

048050628

ABSTRACT:
A DC circuit breaker and a method of commutation during a commutation capacitor capable of being directly charged from a main DC line are disclosed. A breaker unit is inserted in a main DC line and is connected through a first switch in parallel to a series circuit including a commutation capacitor and a reactor. At end of the commutation capacitor is connected to the power side of the main DC line, and the other end thereof to the negative bus of the DC line through a charge capacitor. A series circuit including a magnetic repulsive coil and a second switch is connected in parallel to the commutation capacitor, which is directly charged from the power side of the main DC line. When the breaker unit starts to open, the second switch is turned on so that the polarity of the charged commutation capacitor is reversed to permit a discharged current to flow in the breaker unit in the opposite direction, while at the same time starting the opening of the breaker unit.

REFERENCES:
patent: 4618905 (1986-10-01), Tokuyama
Greenwood, A. H. and Lee, T. H., "Theory and Application of the Commutation Principle for HVDC Circuit Breakers," (Nov. 30, 1971), pp. 1570-1574.

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