Resonant acoustics-based porcelain support insulator hot-line detection method

Abstract

The invention discloses a resonant acoustics-based porcelain support insulator hot-line detection method. The method comprises the following steps of in live-line detection, applying an excitation signal for a porcelain support insulator to be detected so that the porcelain support insulator produces forced vibration, carrying out modal analysis on the porcelain support insulator to be detected, determining if the difference of inherent frequency distribution of the porcelain support insulator to be detected and a complete insulator is obvious, wherein if the difference is obvious, defects exist, if the difference is unconspicuous, finding a frequency scope with the largest difference with the inherent frequency of the porcelain support insulator to be detected, and carrying out power spectrum analysis on the porcelain support insulator to be detected according to the frequency scope as a power spectrum analysis excitation signal. The detection method can carry out hot-line detection in normal hot-line work of the support insulator, the detection process does not influence normal operation of an electrical network, detection time is not limited by power grid blackout, timely detection can be carried out according to operation work, detection accuracy is high and a power grid condition based maintenance level is effectively improved.

Description

technical field [0001] The invention relates to live detection of porcelain post insulators, in particular to a method for live detection of porcelain post insulators based on resonance acoustics. Background technique [0002] Porcelain post insulators are the main type of substation insulators, which mainly insulate and support lines and other equipment. Due to the extremely low toughness of porcelain insulators, most porcelain insulators are subjected to long-term mechanical loads during power grid operation, as well as the influence of severe weather such as strong winds, rain, snow, and sunlight. In addition, there are reasons such as unreasonable design, inadequate installation, and maintenance. Finally, it is very easy to cause brittle fracture accidents of the porcelain post insulators in operation, resulting in partial or complete power outages of substations and power supply lines, as well as equipment damage and casualties, leading to serious consequences. Therefo...

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Problems solved by technology

These three methods generally have disadvantages such as low safety performance, complicated measurement work, high measurement cost, imprecise measurement and poor anti-interference ability.

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