基于物联感知数据和张量融合的电力变压器绕组绝缘劣化评估方法

doi:10.19595/j.cnki.1000-6753.tces.222148

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Abstract

Online evaluation of winding insulation degradation is of great significance to the stable operation of transformers. Due to the lack of corresponding online sensing means, the traditional degradation evaluation methods relying on data such as furfural content and methanol content in oil cannot realize the online evaluation of winding insulation degradation. Most of the degradation evaluation methods based on online sensing data such as voltage and current only consider the influence of a single factor, and it is difficult to fully reflect the degree of degradation of winding insulation. To solve these problems, we propose a power transformer winding insulation degradation evaluation method based on IoT sensing data and tensor fusion. This method takes the influence of electrical, thermal, and mechanical factors of insulation degradation into account, and relies on voltage, current, temperature, and partial discharge IoT sensing data to realize online evaluation of transformer winding insulation degradation.
Firstly, analyze the cumulative damage mechanism of winding insulation degradation caused by electrical, thermal, and mechanical factors. Relying on the transformer IoT sensing data of voltage, current, temperature and partial discharge to construct the electrical, thermal and mechanical performance degradation damage indicators of winding insulation. Then, based on tensor fusion, we perform feature fusion of three degradation damage indicators, and extract high-dimensional degradation feature correlation information between degradation damage indicators. Finally, we use the minimum quantization error of self-organizing map to quantify the distance between the degradation feature output tensor and the best matching unit weight tensor, construct a comprehensive degradation evaluation index, and realize the online evaluation of the winding insulation degradation degree.
According to the verification results of the proposed method based on the accelerated aging test data, the trend evaluation value, monotonicity evaluation value, robustness evaluation value, scale similarity evaluation value, and fusion evaluation value of the comprehensive degradation evaluation index we constructed are 95.78%, 100.00%, 99.75%, 93.24%, and 97.19%, respectively. The mean absolute error, Mean Square Error, and Root Mean Square Error of the comprehensive degradation evaluation index are all less than 0.05, and the R-Square and Pearson correlation coefficient exceed 97%, the significance test coefficient is less than 0.01. According to the verification result of the actual transformer IoT sensing data and the comparison result of various degradation evaluation methods, the fusion evaluation value of the proposed method exceeds 95%. Compared with other degradation evaluation methods, the proposed method has a higher similarity in trend with the furfural content index of winding insulation.
The conclusions are as follows: (1) The proposed method relies on the IoT sensing data of transformer to quantify the cumulative damage caused by electrical, thermal and mechanical stress to winding insulation from the perspective of mechanism and can accurately describe the degradation trend of winding insulation under multiple stresses. (2) The proposed method fuses the feature tensors of electrical, thermal, and mechanical degradation damage indicators based on tensor fusion, which can extract the high-dimensional degradation correlation information between degradation damage indicators to the greatest extent while retaining the characteristics of each degradation damage. (3) The proposed method can accurately describe the degree of deviation between the winding insulation degradation state and the healthy state through the comprehensive degradation evaluation index constructed by the minimum quantization error. (4) According to the experimental verification results, the proposed method can accurately evaluate the real degradation state of the winding insulation based on the transformer IoT sensing data, and the evaluation results can provide a reference for the maintenance of the winding insulation.

Key words： Power transformer winding insulation degradation evaluation IoT sensing data tensor fusion

Received: 15 November 2022

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TM41

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	Qu Yuehan
	Zhao Hongshan
	Cheng Jingyu
	Ma Libo
	Mi Zengqiang

Cite this article:

Qu Yuehan,Zhao Hongshan,Cheng Jingyu等. Evaluation Method for Power Transformer Winding Insulation Degradation Based on IoT Sensing Data and Tensor Fusion[J]. Transactions of China Electrotechnical Society, 0, (): 127-127.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.222148 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/127

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