Hybrid DC circuit breaker system and fault line detection method for circuit breaker switching on

A technology for DC circuit breakers and faulty lines, which is applied in the detection field of hybrid DC circuit breaker systems and circuit breaker closing fault lines, can solve the problems of failure to detect line faults in time, increase the cost of circuit breakers, etc., and avoid the expansion of the fault range , Reduce economic cost, reduce the effect of capacity

Inactive Publication Date: 2018-08-03
XJ ELECTRIC +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a hybrid DC circuit breaker system and a fault line detection method for closing the circuit breaker, which is used to solve the problem that only large-capacity surge arresters can be selected in the existing hybrid high-voltage DC circuit breaker, resulting in an increase in the cost of the circuit breaker. and the failure to detect line faults in time

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  • Hybrid DC circuit breaker system and fault line detection method for circuit breaker switching on
  • Hybrid DC circuit breaker system and fault line detection method for circuit breaker switching on
  • Hybrid DC circuit breaker system and fault line detection method for circuit breaker switching on

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[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0029] The present invention provides a method for detecting a faulty line for closing a hybrid DC circuit breaker, wherein the hybrid DC circuit breaker includes a transfer branch for conducting when the DC transmission system line is faulty, and the transfer branch includes two or more series-connected circuits. modular units, each modular unit including a first branch with a power electronic switching device. Based on the hybrid DC circuit breaker with the above structure, the fault line detection method for closing the circuit breaker of the present invention includes the following steps:

[0030] The modular units are classified, each level includes at least one modular unit, the modular units of each level are connected in parallel with the second branch of the arrester, and the power electronic switching devices of the corresponding modula

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Abstract

The invention relates to a hybrid DC circuit breaker system and a fault line detection method for circuit breaker switching on. The transfer branch of the hybrid DC circuit breaker has a characteristic that multistage modular units are connected in series. By a manner that the transfer branch is switched on hierarchically, the current in an arrester is determined to determine whether the switchingis in a fault line. Compared with the prior art, the method can relatively reduce the capacity of the arrester and reduce the economic cost of the hybrid DC circuit breaker while detecting the line fault timely. The method is especially suitable for determine whether the reclosing is in the fault line during the reclosing of the DC circuit breaker, avoids the large short-circuit current generatedby the direct closing in the fault line, effectively avoids the damage to other DC equipment caused by the expansion of a fault range.

Description

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Claims

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Application Information

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Owner XJ ELECTRIC
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