覆冰绝缘子串泄漏电流与覆冰量及覆冰水电导率的关系

发布时间：2018-02-22 15:37

本文关键词： 泄漏电流覆冰量覆冰水电导率污冰参数神经网络预测模型复合绝缘子　出处：《电工技术学报》2014年10期 　论文类型：期刊论文

【摘要】：污秽与覆冰量是影响输电线路绝缘子冰闪电压的主要因素,因此有效预测污秽和覆冰量是防止发生冰闪事故的手段。本文通过人工气候室试验,模拟运行电压下覆冰量和覆冰水电导率对覆冰绝缘子泄漏电流的影响,提取了泄漏电流的三个特征量:泄漏电流脉冲幅值、谐波含量和电荷量,这三个特征量从不同角度描述了泄漏电流与覆冰量和覆冰水电导率的关系,并且得到了它们之间的回归方程式。基于泄漏电流特征量与覆冰量、覆冰水电导率的关系,提出覆冰绝缘子污冰预测神经网络模型,脉冲幅值、谐波含量和电荷量作为神经网络的输入量,污冰参数(ISP)作为神经网络的输出量。神经网络模型预测结果与试验测试结果对比分析可知,预测结果与试验结果的相对误差绝对值小于8.5%,因此本文提出的覆冰绝缘子污冰预测模型能够有效地对覆冰绝缘子ISP进行预测,为输电线路外绝缘的选择和设计提供参考依据,对于预防冰闪事故的发生有着重要的意义。
[Abstract]:Pollution and ice content are the main factors that affect the ice lightning voltage of insulators on transmission lines. Therefore, the effective prediction of pollution and ice coverage is the means to prevent ice flashover accidents. The effects of icing amount and ice-covered water conductivity on leakage current of icing insulator are simulated. Three characteristic quantities of leakage current are extracted: pulse amplitude of leakage current, harmonic content and charge quantity. These three characteristic quantities describe the relationship between leakage current and icing amount and ice water conductivity from different angles, and obtain the regression equation between them, based on the relationship between leakage current characteristic quantity and icing amount, ice water conductivity, the relationship between leakage current characteristic quantity and icing water conductivity is obtained. A neural network model for ice prediction of icing insulators is proposed. The pulse amplitude, harmonic content and charge are used as the inputs of the neural network. ISP) is used as the output of neural network. The comparison and analysis of the prediction results of neural network model and the test results show that, The absolute value of the relative error between the prediction results and the test results is less than 8.5. Therefore, the prediction model of icing insulators can effectively predict the ISP of icing insulators and provide a reference for the selection and design of external insulation of transmission lines. It is of great significance to prevent the occurrence of ice flash accident.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2009CB724502)
【分类号】：TM216

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