Lifespan Evaluation of HTV Silicone Rubber in Outdoor Composite Insulators Considering Temperature Cycling and Corona Discharge

IF 3.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-03-06 DOI:10.1109/TDEI.2025.3567210

Shiyin Zeng;Wendong Li;Xin Zhao;Yanan Peng;Yuelin Liu;Xinyi Yan;Guanjun Zhang

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引用次数: 0

Abstract

The reliability of high-voltage overhead lines is strongly correlated to the status of outdoor insulators, which is correlated to the condition of high-temperature vulcanized silicone rubber (HTV-SR) used as insulator sheds. Current research pays attention to HTV-SR’s degradation under different environmental stresses (e.g., temperature and corona discharge). However, the lifetime assessment of the aged HTV-SR is unclear, and the effect of temperature cycling is seldom considered. In this study, a remaining useful lifetime (RUL) prediction method for HTV-SR is proposed, which considers both temperature cycling and corona discharge. Accelerated lifetime tests of HTV-SR are conducted, and the key parameters of the model are determined by the experimental data. Thus, a formula for quantitative RUL prediction is put forward, which indicates that when the cyclic temperature is

$5.5~^{\circ }$

$\sim 21.3~^{\circ }$

C and the electric field strength at the sample surface is 4.5 and 6.8 kV/cm, the RUL with 90% reliability is 25.9 and 8.4 years. Furthermore, verification of the prediction model is conducted using the elongation at break of field-aged insulators with different operation times. This study provides a method to estimate the RUL of HTV-SR materials, which can guide the maintenance of outdoor insulators of power transmission lines.

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考虑温度循环和电晕放电的HTV硅橡胶室外复合绝缘子寿命评价

高压架空线路的可靠性与室外绝缘子的状态密切相关，而室外绝缘子的状态又与高温硫化硅橡胶（hhtv - sr）用作绝缘子棚的状况有关。目前的研究重点是HTV-SR在不同环境应力（如温度和电晕放电）下的降解。然而，对HTV-SR的寿命评估尚不明确，且很少考虑温度循环的影响。在本研究中，提出了一种同时考虑温度循环和电晕放电的HTV-SR剩余使用寿命预测方法。对HTV-SR进行了加速寿命试验，并根据试验数据确定了模型的关键参数。由此，提出了RUL定量预测公式，当循环温度为$5.5~^{\circ}$ C $ sim为21.3~^{\circ}$ C，样品表面电场强度为4.5和6.8 kV/cm时，RUL的可靠性分别为25.9和8.4年。利用不同运行次数的现场老化绝缘子断裂伸长率对预测模型进行了验证。本研究提供了一种估算HTV-SR材料RUL的方法，可以指导输电线路室外绝缘子的维护。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程：电子与电气

CiteScore

6.00

自引率

22.60%

发文量

309

审稿时长

5.2 months

期刊介绍： Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.