Commutation type DC breaker
First Claim
1. A commutation type DC breaker comprising:
- a main contact adapted to be connected between a DC power supply and a load;
a commutation circuit, including a series connection of a commutation capacitor, a reactor and a commutation switch, electrically connected in parallel to said main contact;
a current detector for detecting a non-load current passing through the load;
blocking means for blocking flow of a commutation current from said commutation circuit to the load;
control means responsive to detection of the non-load current, for opening said main contact, to cause a commutation current to flow from said commutation circuit, and for actuating said blocking means, to block flow of the commutation current to the load.
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Accused Products
Abstract
A commutation type DC breaker having a commutation circuit electrically connected in parallel to a main contact. The main contact is connected between a DC power supply and a load. The commutation circuit is a series circuit of a commutation capacitor, a reactor and a commutation switch, with an energy absorption device electrically connected in parallel to the main contact. A switch or a breaker for preventing the flow of commutation current from the commutation circuit to the load in a non-load opening mode is connected between an electrical connection point (P), of the main contact and the commutation circuit, and the load and is opened substantially simultaneously with the opening of the main contact, or before the closure of the commutation switch. In this manner, the safety on the load in the non-load opening mode is enhanced.
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Citations
15 Claims
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1. A commutation type DC breaker comprising:
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a main contact adapted to be connected between a DC power supply and a load; a commutation circuit, including a series connection of a commutation capacitor, a reactor and a commutation switch, electrically connected in parallel to said main contact; a current detector for detecting a non-load current passing through the load; blocking means for blocking flow of a commutation current from said commutation circuit to the load; control means responsive to detection of the non-load current, for opening said main contact, to cause a commutation current to flow from said commutation circuit, and for actuating said blocking means, to block flow of the commutation current to the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification