Circuit breakers
First Claim
1. A circuit breaker comprising:
- a first dc line electrically connectable to first incoming and first outgoing dc lines, wherein the first dc line comprises a first fault-interrupting switch contact system comprising contacts; and
a first switching aid network comprising;
a first and a second rectifier string, wherein each rectifier string comprises one or more series connected reverse blocking power electronic devices that define a first H-bridge rectifier, wherein the H-bridge rectifier comprises first and second dc input terminals and first and second dc output terminals, wherein the first and second dc input terminals are connected to the first dc line in parallel with the first fault-interrupting switch contact system,a snubber string comprising at least one series connected power electronic devices capable of being turned on by gate control and a capacitor, wherein the snubber string is connected between the first and second dc output terminals of the first H-bridge rectifier,a pre-charge string comprising at least one series connected power electronic devices capable of being turned on by gate control and a resistor, wherein the pre-charge string is connected between the first and second dc output terminals of the first H-bridge rectifier, anda surge arrester connected between the first and second dc output terminals of the first H-bridge rectifier.
1 Assignment
0 Petitions
Accused Products
Abstract
A circuit breaker comprising a first dc line electrically connectable to first incoming and first outgoing dc lines, wherein the first dc line comprises a first fault-interrupting switch contact system and a first switching aid network. The first switching aid network comprises first and second rectifier strings, wherein each rectifier string comprises one or more series connected reverse blocking power electronic devices that define a first H-bridge rectifier. The first switching aid network further comprises a snubber string, the snubber string comprising at least one series connected power electronic devices capable of being turned on by gate control and a capacitor. The first switching aid network further comprises a pre-charge string comprising at least one series connected power electronic devices capable of being turned on by gate control and a resistor, and a surge arrester connected between the first and second dc output terminals of the first H-bridge rectifier.
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Citations
15 Claims
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1. A circuit breaker comprising:
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a first dc line electrically connectable to first incoming and first outgoing dc lines, wherein the first dc line comprises a first fault-interrupting switch contact system comprising contacts; and a first switching aid network comprising; a first and a second rectifier string, wherein each rectifier string comprises one or more series connected reverse blocking power electronic devices that define a first H-bridge rectifier, wherein the H-bridge rectifier comprises first and second dc input terminals and first and second dc output terminals, wherein the first and second dc input terminals are connected to the first dc line in parallel with the first fault-interrupting switch contact system, a snubber string comprising at least one series connected power electronic devices capable of being turned on by gate control and a capacitor, wherein the snubber string is connected between the first and second dc output terminals of the first H-bridge rectifier, a pre-charge string comprising at least one series connected power electronic devices capable of being turned on by gate control and a resistor, wherein the pre-charge string is connected between the first and second dc output terminals of the first H-bridge rectifier, and a surge arrester connected between the first and second dc output terminals of the first H-bridge rectifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of interrupting fault current using a circuit breaker comprising a first dc line electrically connectable to first incoming and first outgoing dc lines, wherein the first dc line comprises a first fault-interrupting switch contact system comprising contacts;
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a first switching aid network comprising; a first and a second rectifier string, wherein each rectifier string comprises one or more series connected reverse blocking power electronic devices that define a first H-bridge rectifier, wherein the H-bridge rectifier comprises first and second dc input terminals and first and second dc output terminals, wherein the first and second dc input terminals are connected to the first dc line in parallel with the first fault-interrupting switch contact system, a snubber string comprising at least one series connected power electronic devices capable of being turned on by gate control and a capacitor, wherein the snubber string is connected between the first and second dc output terminals of the first H-bridge rectifier, a pre-charge string comprising at least one series connected power electronic devices capable of being turned on by gate control and a resistor, wherein the pre-charge string is connected between the first and second dc output terminals of the first H-bridge rectifier, and a surge arrester connected between the first and second dc output terminals of the first H-bridge rectifier, the method comprising; actuating the fault-interrupting switch contact system so that the contacts open, causing an arc to be formed and wherein the switching aid network causes the arc to transit into and thereafter remain in an astatic region until it is extinguished. - View Dependent Claims (12, 13, 14, 15)
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Specification