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首页> 外文期刊>Science, Measurement & Technology, IET >Condition assessment of outdoor porcelain insulator based on dielectric dissipation factor evaluated from non-linear equivalent circuit
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Condition assessment of outdoor porcelain insulator based on dielectric dissipation factor evaluated from non-linear equivalent circuit

机译：基于非线性等效电路评估的介电损耗因子的户外瓷绝缘子状态评估

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摘要

This study presents a novel technique for estimation of contamination level as well as flashover voltage of outdoor insulators based on dielectric dissipation factor evaluated from the applied sinusoidal excitation and corresponding surface leakage current. Existing literature shows that surface leakage current of insulator is infested with odd harmonics though the applied voltage is sinusoidal in nature. The presence of harmonic contents in leakage current is due to non-linear characteristics of the insulator surface owing to formation of dry bands. The nonlinear characteristic of the insulator surface depends on its contamination level which in turn affects the corresponding flashover voltage. Therefore, the harmonic configuration in leakage current can be correlated with the contamination level on insulator surface and corresponding flashover voltage. Considering the fact, in this contribution, a non-linear equivalent circuit of insulator has been proposed based on harmonic components of the leakage current. For each harmonic component of the leakage current flowing through the insulator system, energy lost and energy stored in the system is calculated, which eventually enables to calculate dielectric dissipation factor. The proposed technique is applied for experimental investigation on 11 kV disc porcelain insulator artificially contaminated in the laboratory under controlled environmental conditions.
机译：这项研究提出了一种新技术，用于根据绝缘损耗因数估算室外绝缘子的污染水平和闪络电压，介电损耗因数由施加的正弦激励和相应的表面泄漏电流评估得出。现有文献表明，尽管所施加的电压本质上是正弦波，但绝缘子的表面泄漏电流充满了奇次谐波。漏电流中谐波含量的存在归因于绝缘体表面的非线性特性，这归因于干带的形成。绝缘子表面的非线性特性取决于其污染程度，这又会影响相应的闪络电压。因此，泄漏电流中的谐波配置可以与绝缘子表面上的污染水平和相应的闪络电压相关联。考虑到这一事实，在该贡献中，已经提出了一种基于漏电流的谐波分量的绝缘子的非线性等效电路。对于流经绝缘系统的泄漏电流的每个谐波分量，都会计算出损失的能量和存储在系统中的能量，最终可以计算介电损耗因子。所提出的技术用于在受控环境条件下在实验室中人工污染的11 kV圆盘瓷绝缘子的实验研究。

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