Early-warning method for arcing fault of AC circuit breaker

An AC circuit breaker, fault early warning technology, applied in the AC network to reduce harmonics/ripple, emergency protection circuit devices, electrical components, etc. Problems such as the arc model of the device

Active Publication Date: 2017-06-20
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology

The existing statistical results show that in the HVDC converter stations that have been put into operation, there have been many arcing and breakdown phenomena after the AC circuit breaker disconnected the high-voltage capacitive circuit, which eventually led t...

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  • Early-warning method for arcing fault of AC circuit breaker
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  • Early-warning method for arcing fault of AC circuit breaker

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Embodiment

[0028] The present invention mainly divides the dynamic arc resistance model into a pre-breakdown stage model, an arc burning stage model and an arc resting stage model. By analyzing the dynamic change process of the measured arc, the present invention constructs a segmented arc model, wherein the arc resistance model in the pre-breakdown stage adopts the modified Toepler model, the arc burning stage adopts a fixed resistance model, and the arc resting stage adopts an exponential rise model.

[0029] According to Thomson's theory, when an arcing fault occurs, the arcing process can be divided into three stages: the pre-breakdown stage, the arcing stage and the arcing stage, such as figure 1 As shown, the figure is a schematic diagram of the segmented dynamic arc resistance model of the present invention, wherein, t 1 ~t 2 is the pre-breakdown stage, t 2 ~t 3 time arcing stage, t 3 ~t 4 for the arc extinguishing phase.

[0030] Before the pre-breakdown and after the arc e...

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Abstract

The invention relates to an early-warning method for an arcing fault of an AC circuit breaker. The early-warning method is used for early warning by acquiring a dynamic arcing model of the AC circuit breaker. The method comprises the following steps of 1) dividing arcing process of the AC circuit breaker into three steps in continuous time, wherein the three steps comprise a prebreakdown step, an arcing step and an arc failure step; 2) respectively acquiring step arcing models corresponding to the prebreakdown step, the arcing step and the arc failure step; 3) combining all step arcing models according to continuous time to finally acquire the dynamic arcing model of the AC circuit breaker; and 4) performing arcing fault early-warning of the circuit breaker according to the dynamic arcing model of the AC circuit breaker. Compared with the prior art, the method has the advantages of technological support and the like, and is more coincide with and conforms to an actual condition.

Description

technical field [0001] The invention relates to the field of fault detection of AC circuit breakers, in particular to an early warning method for arcing faults of AC circuit breakers. Background technique [0002] Up to now, 15 long-distance super- and UHV DC transmission lines and 3 back-to-back converter stations have been built and put into operation in China. According to the plan, 15 DC projects will be started in the near future, with a total conversion capacity of 230 million kW and a total line length of 25,000 km, including 14 ±800kV and 1 ±1100kV DC projects. [0003] Due to the extensive use of power electronic devices, a large number of harmonics are generated on both the AC side and the DC side of the DC transmission converter station. In order to improve the power quality and ensure the stable operation of electrical equipment, the AC filter is connected in parallel on the AC bus side for Filter out a large number of harmonics in the system, and also provide r...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02H7/22
CPCH02H7/22H02J3/01Y02E40/40
Inventor 周孝法傅坚刁冠勋王和杰吴剑敏周徐达肖烨辉闫全全王长春鲁小芬
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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