High voltage circuit breaker arc contact fault diagnosis method

Abstract

The invention discloses a high voltage circuit breaker arc contact fault diagnosis method which includes the following steps: initializing reference characteristic quantity; acquiring a dynamic resistance-stroke curve of a high voltage circuit breaker arc contact to be diagnosed and acquiring the area enclosed by the curve in the tripping process arc contact contacting stage as characteristic quantity to be diagnosed; comparing the characteristic quantity to be diagnosed with the preset reference characteristic quantity, diagnosing the state of the high voltage circuit breaker arc contact according to a comparison result and outputting a diagnosis result. Due to the fact that the area enclosed by the dynamic resistance-stroke curve in the tripping process arc contact contacting stage is utilized as the characteristic quantity to be diagnosed, the burning state and the contacting position of the arc contact correspond to each other, the burning degree of the circuit breaker arc contact can be diagnosed accurately and visually, and the method provides a basis for evaluation of the state of a circuit breaker arc extinguish chamber and making of circuit breaker overhauling decision. The method has the advantages of being high in diagnosis accuracy and high in detection speed, facilitating detection, not requiring disassembly of a high voltage circuit breaker to be diagnosed and saving manpower and material resources.

Description

technical field

[0001] The present invention relates to a fault detection technology of a high-voltage circuit breaker, in particular to a method for diagnosing a fault of an arc contact of a high-voltage circuit breaker. Whether the arcing contact has reached a defect state. Background technique

[0002] High-voltage circuit breakers are the most important control and protection equipment to ensure the safe and stable operation of the power grid. There are a large number of them in the power grid and their structures are extremely complex. The circuit breaker contacts are composed of main contacts and arcing contacts in parallel. Since the arcing contacts are longer than the main contacts, the arcing contacts of the circuit breaker are separated from the main contacts during the opening process. After the arcing contacts are separated, an arc is generated between the moving and static arcing contacts due to the action of the electric field. Every time the circuit breaker ...

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