Stress measurement and alarm device and method for knob insulator

Abstract

The invention provides a stress measurement and alarm device for a knob insulator. The stress measurement and alarm device comprises a tension sensor, a signal conditioning circuit, an A / D (analog / digital) conversion module, a processor, an input / output module and a pre-alarm module, wherein the tension sensor collects tension of a knob insulator busbar pull wire and processes the tension into a micro-voltage signal, the amplitude and frequency of the signal are conditioned by the signal conditioning circuit, a tension value is obtained after conversion by the A / D conversion module, and the stress distribution condition and the maximum stress are obtained in the processor according to an input tension angle parameter and based on the corresponding relation of preset stress distribution and force load; when the maximum stress is larger than a preset threshold, an alarm is given through the pre-alarm module; or otherwise, the stress distribution condition is displayed on the input / output module. With implementation of the embodiment of the invention, the stress state of the knob insulator can be detected on line, and the device is simple and easy to operate and has high safety, reliability and accuracy, so that the knob insulator can be prevented from breaking accidents.

Description

technical field [0001] The invention relates to the technical field of power system detection, in particular to a stress detection and alarm device and method for porcelain post insulators. Background technique [0002] Porcelain insulators can be divided into line porcelain insulators and power station porcelain insulators according to their uses. Among them, porcelain insulators for power stations are mainly porcelain post insulators, which can be used for electrical equipment such as disconnectors, busbars, grounding switches, and wave traps in substations, and play the role of insulation and mechanical fixation. Therefore, whether the porcelain post insulator can operate reliably and stably is related to the safety of the power grid, and the fast and safe online detection method of the porcelain post insulator can avoid damage to the isolating switch or short circuit of the substation bus due to the breakage of the porcelain bottle of the porcelain post insulator Discon...

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Problems solved by technology

[0004] Non-contact detection methods include: 1. Ultrasonic detection method with the function of ultrasonic detection of defects, its disadvantage is that it is immature and limited by various external factors; 2. Doppler vibration method with laser frequency measurement, which is aimed at The insulators with cracks have been tested and the effect is obvious. The disadvantages are: the detection of uncracked porcelain post insulators is invalid, and the detection equipment is expensive, bulky, difficult to operate, and complicated to maintain. It is not suitable for field work.

[0005] The contact detection method includes: 1. The voltage distribution method, its disadvantage is that it is necessary to measure the voltage distribution on the normal porcelain post insulator in advance, but the on-site measurement work is more complicated; 2. The current detection method, its disadvantage is that it needs to have Certain working conditions, especially for ceramic post insulators on equipment with relatively high risk and complex structure, need to be measured one by one

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