Loosening detection device and method for fastening bolt of high voltage breaker

Abstract

The invention discloses a loosening detection device and method for a fastening bolt of a high voltage breaker, and belongs to the fault detection field of a power system. The detection device comprises a vibration accelerometer laid on the fastening bolt to be monitored in the high voltage breaker and a signal collection module connected to the output end of the vibration accelerometer, and the output end of the signal collection module is connected to a signal processing module. The accelerometer is not limited by the narrow internal space of the breaker due to the fact that the accelerometer is small and light compared with other intelligent detection means, and safe and reliable operation of the detection device is ensured. According to the detection method, violent vibration excitation in the opening / closing process of the breaker is utilized, the vibration accelerometer collects vibration signals near the target bolt, sensitive vibration waveform extraction, wavelet noise reduction, blind source separation and wavelet packet energy entropy analysis are carried out on the vibration signals, and whether the fastening bolt of the high voltage breaker is loosened is determined bytaking an established bolt loosening detection database as reference.

Description

technical field [0001] The invention belongs to the field of power system fault detection, and in particular relates to a high-voltage circuit breaker fastening bolt looseness detection device and detection method. Background technique [0002] High-voltage circuit breakers are an important part of the power system and have the functions of control and protection. When a fault occurs in the power system, it is required that the high-voltage circuit breaker can cut off the fault current quickly and accurately, so as to prevent the further expansion of the accident, so as to ensure the safe operation of the system. Therefore, the reliability requirements for the operation of high-voltage circuit breakers are getting higher and higher, and relevant statistics show that mechanical failure is the main failure form of high-voltage circuit breakers. [0003] Due to the advantages of simple structure and convenient assembly, bolted connection is widely used in various fields in eng...

AI Technical Summary

Problems solved by technology

However, there are many bolts used in high-voltage circuit breakers, and the location of many bolt connections is not convenient for manual detection. Therefore, manual inspection is time-consuming and laborious.

The internal structure of the high-voltage circuit breaker is compact and the space is small, which makes some intelligent detection methods (such as image analysis technology) unusable

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