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文章摘要
辐射电场特征能量提取法在评估GIS状态中的应用研究
Research on extraction of characteristic energy of radiated E-field method in evaluating GIS status
Received:March 24, 2017  Revised:March 24, 2017
DOI:
中文关键词: 小波包分解  特征提取  辐射电场  GIS  CB  状态评估
英文关键词: wavelet packet decomposition  feature extraction  radiated E-field  GIS  CB  state assessment
基金项目:国家自然科学基金项目( 重点项目)
Author NameAffiliationE-mail
Hao Jinpeng State Grid Ningxia Electric Power Company Electric Power Research Institute 416444715@qq.com 
ZHANG Hongye* Xi'an Jiaotong University 1227959897@qq.com 
GUO Fei State Grid Ningxia Electric Power Company 416444715@qq.com 
GUO Jun Xi'an Jiaotong University 1227959897@qq.com 
Li Xiuguang State Grid Ningxia Electric Power Company Electric Power Research Institute 416444715@qq.com 
Wu Xutao State Grid Ningxia Electric Power Company Electric Power Research Institute 416444715@qq.com 
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中文摘要:
      气体绝缘变电站(gas insulated substation,GIS)内的隔离开关(disconnecting switch, DS) 或者断路器(circuit breaker,CB)的动作会在GIS外部产生强烈的辐射电磁场环境。为了通过此测得的辐射场特征参数评估GIS的健康状态,特提出利用小波包分解提取辐射电场信号特征频段能量的方法。采用bior5.5小波基函数,分别对GIS处于健康状态与GIS中CB内出现绝缘故障两种情况下CB关合动作所产生的辐射电场信号进行4层小波包分解,从而提取不同频段的归一化能量,发现31.25MHz以下的频段为此GIS因CB动作所产生辐射电场信号的特征频段。经推广,通过对比任意一次CB动作后辐射电场在特征频段的能量与GIS正常运行状态下典型辐射电场的特征频段的能量,可以诊断CB的绝缘故障,评估GIS的健康状态。
英文摘要:
      Switching operations of a disconnecting switch (DS) or a circuit breaker (CB) in a gas insulated substation (GIS) can stimulate outside GIS strong radiated electromagnetic fields. In order to assess the status of GIS through its characteristic parameters, a method of extracting the characteristic frequency-band energy of the electric field (E-field) based on wavelet packet analysis is proposed. Using the bior5.5 wavelet basis function, the radiated E-field signals of CB in good condition and those of CB in which insulation fault happens are separately decomposed into 4 layers, and the normalized energies of different frequency bands are extracted; then it’s found that the frequency band below 31.25MHz is the characteristic band of radiated E-field. By comparing the energies in the characteristic frequency bands after a random CB operation with that of the typical radiated E-field obtained when GIS totally is in good condition, insulation faults of CB can be detected and the operating state of GIS could be assessed.
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