Mechanical state identification method of high voltage breaker

Abstract

The invention discloses a mechanical state identification method of a high voltage breaker, based on characteristic extraction and characteristic selection of a contact stroke curve. The mechanical state identification method of a high voltage breaker includes the steps: obtaining the contact stroke curve of the high voltage breaker in different mechanical states through a large number of breaking-closing experiments; calculating three core characteristics: breaking / closing time, breaking / closing speed and average speed; performing equi-width dispersion on the contact stroke curve, and taking the stroke values of each time as the characteristic points to form the characteristics to be screened; calculating the mutual information between each characteristic point to be screened and the fault category so as to represent the correlation between the contact stroke at the moment and the fault category; selecting a maximum correlation minimum redundancy criterion to screen the above characteristics, and selecting a group of optimal characteristic vectors; and using the screened optimal characteristic vector to train a support vector machine so as to perform state identification on the unknown state data. The mechanical state identification method of a high voltage breaker enables state identification to be more accurate and complete, and provides reference for analysis of the breaking / closing process.

Description

technical field [0001] The invention relates to a method for identifying the state of a high-voltage circuit breaker in a high-voltage power supply and distribution line or a power supply and distribution system, in particular to a method for identifying the mechanical state of a high-voltage circuit breaker based on feature extraction and feature selection of contact travel curves. Background technique [0002] High-voltage circuit breaker is one of the largest power equipment in the power system, and it is also the most important switchgear, which is responsible for the dual tasks of control and protection. Therefore, its performance and reliability are important factors to determine the safe operation of the power system. [0003] Since the internal structure of the high-voltage circuit breaker is not visible, it is difficult to intuitively know whether the components in it are in normal working condition. However, it is impractical to measure and analyze the internal co...

AI Technical Summary

Problems solved by technology

At present, the travel curve of the contact is generally used to identify the mechanical state of the high-voltage circuit breaker, but for the contact travel curve, there is no set that can reflect the entire The feature extraction and feature selection system of the characteristics of each stage of the opening / closing process, so the present invention extracts the travel value at each moment as a feature, calculates the mutual information between each feature and the state category, and then finds the optimal feature vector. Unknown state data is identified, and the moment corresponding to the optimal eigenvector can be considered as the key point that needs to be focused on and analyzed during the opening / closing process

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