Insulator surface dirt damping characteristic detection method based on phase angle difference principle

By constructing a localized low-interference detection system based on the phase angle difference principle, the system identifies the saturation moisture point of the insulator's contamination layer. This solves the problems of measurement error caused by high-voltage excitation and insufficient multi-factor analysis in existing technologies, and achieves high-precision quantification and evaluation of the insulator's contamination and moisture state.

CN121348005APending Publication Date: 2026-01-16CHINA THREE GORGES UNIV
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Patent Information

Application Number
CN202511499062.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-20
Publication Date
2026-01-16

AI Technical Summary

Technical Problem

In the existing technology, the methods for monitoring the contamination and moisture status of insulators have problems such as high-voltage excitation causing the contamination layer to dry out, scattered measurement results, large errors, inability to accurately identify saturated moisture points, and lack of multi-factor analysis, which make it difficult to meet the needs of insulation performance evaluation.

Method used

A detection method based on the phase angle difference principle is adopted. By constructing a localized low-interference detection system, the phase angle difference data is obtained using a low-voltage AC power supply and a sampling resistor. The data is then converted into a rectangular wave pulse signal to identify the saturated moisture point of the dirt layer. Combined with quantitative analysis of influencing factors, a quantitative relationship model is established.

Benefits of technology

It achieves automatic identification of saturated moisture points without high-voltage excitation, reduces measurement errors, improves the quantitative accuracy of contamination and moisture conditions, and provides a precise basis for evaluating the external insulation performance of insulators.

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Abstract

The invention provides an insulator surface dirt damping characteristic detection method based on a phase angle difference principle, and relates to the technical field of power equipment insulation state online monitoring and diagnosis. Comprising the following steps: S1, constructing a localized low-interference detection system comprising a voltage follower, arranging a measuring electrode on the surface of an insulator, and combining a low-voltage alternating-current power supply and a sampling resistor to obtain phase angle difference data; s2, power supply voltage and sampling resistor voltage waveforms are collected and converted into rectangular wave pulse signals, and a real-time phase angle difference value is calculated; s3, on the basis of the curve that the phase angle difference changes along with time, identifying saturated damp points of the dirty layer, and extracting saturated damp parameters; s4, analyzing the quantitative influence rule of the influence factors on the saturation damping parameters by changing the influence factors; the method reduces the delay and error possibly introduced by software calculation, improves the real-time performance and original accuracy of phase angle difference data, achieves the objective and automatic recognition of the saturated damp point, and improves the precision of the quantification of the dirty damp state.
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