Hybrid DC circuit breaker and method for sharing main flow branch circuit and protection device

Abstract

The embodiment of the invention discloses a hybrid direct current circuit breaker and a method for sharing a main flow branch and a protection device. The hybrid direct current circuit breaker is provided with a first main conduction branch and a second main conduction branch, wherein the first main conduction branch and the second main conduction branch respectively correspond to one direct current branch in the multi-terminal direct current system. And a first isolating switch and a first reversing switch are arranged in the first main conduction branch, a second isolating switch and a second reversing switch are arranged in the second main conduction branch, and a circuit breaker electrically connected to the first load side is arranged. The third isolating switch and the fourth isolating switch electrically connected to the second load side are arranged so that the two DC branches of the first main conduction branch and the second main conduction branch can share a set of main current-through circuit and protection device, Therefore, the number of main current circuits and protection devices used between adjacent DC branches is reduced, the integration of hybrid circuit breakers on adjacent DC branches is realized, and the size and cost of the hybrid circuit breaker are reduced.

Description

technical field [0001] Embodiments of the present invention relate to the field of electrical technology, and in particular, to a hybrid DC circuit breaker that shares a main current-passing branch and a protection device and a method thereof. Background technique [0002] Compared with AC transmission, DC transmission has the advantages of low line loss, large transmission capacity, long transmission distance, and no problem of system synchronous operation stability. Among them, DC circuit breaker is an important equipment for DC transmission. [0003] At present, the hybrid DC circuit breaker composed of mechanical switches and power electronic devices has low losses under normal operation, and can break the circuit quickly and effectively during fault protection. However, for a multi-terminal DC system, one terminal is usually connected to multiple branches. In order to ensure that the fault can be cut off quickly without affecting the normal operation of other branches w...

AI Technical Summary

Problems solved by technology

However, for a multi-terminal DC system, one terminal is usually connected to multiple branches. In order to ensure that the fault can be quickly cut off without affecting the normal operation of other branches when a fault occurs in one of the branches, it is necessary to connect a circuit breaker to each branch. , which makes it possible to install multiple hybrid circuit breakers at the same terminal. A single hybrid circuit breaker already requires a lot of space and cost, and the space and cost required to install multiple hybrid circuit breakers at the same terminal are greatly increased, limiting Practical application of hybrid circuit breaker

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