Mechanical fault diagnosis method for gas insulated combination switchgear based on abnormal vibration

Abstract

The invention relates to a method for diagnosing mechanical faults of gas-insulated combined switchgear based on abnormal vibration. Firstly, the vibration signal of the GIS in the normal state is used as the reference, and after the abnormal vibration signal is judged, feature extraction is performed; the abnormal vibration signal is processed by wavelet packet decomposition, and the obtained The wavelet packet feature entropy of each frequency band is used to construct the feature entropy vector; the data set is constructed according to the feature entropy vector, and the BP neural network is used for fault mode recognition. The present invention utilizes wavelet packet energy entropy to have the advantage of multi-resolution, and the description advantage of time-frequency localization is obvious. The vibration signal under the action of the exciting force has comprehensive data information, high diagnostic reliability and accurate calculation results.

Description

technical field [0001] The invention belongs to the technical field of intelligent substations, in particular to a method for diagnosing mechanical faults of gas-insulated combined switchgear based on abnormal vibration. Background technique [0002] GIS equipment has been widely used all over the world since it was put into practical use in the 1960s. At present in China, the use of SF6 gas to replace insulating oil and air in high-voltage circuit breakers has become the mainstream. Newly built or renovated 220KV and above transformer stations basically all use switchgear. As of 2000, there were a total of 12,162 circuit breakers with a voltage level of 220KV and above in the country, of which 100% of the 500KV switchgear and nearly 100% of the 330KV switchgear were circuit breakers and GIS; and 220KV voltage level circuit breakers and GIS It accounts for 50% to 60% of the shipped switchgear. [0003] Despite its many advantages, GIS still has some disadvantages. For exa...

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Problems solved by technology

However, this patent does not take into account the problem of mechanical fault diagnosis under the action of other excitation sources (such as isolation switch excitation, earthing switch excitation and electromagnetic force excitation)

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