基于网络分析仪的GIS局部放电在线监测特高频传感器现场校核技术

如何校核已投运的传感器性能是保障气体绝缘金属封闭开关设备（gas-insulated metal-enclosed switchgear, GIS）局部放电监测可靠性的重要课题。基于网络分析仪,采用扫频方法测试安装在实体 GIS 上的传感器的响应特性,并研究其与特高频传感器平均有效高度的关系。通过比较分析发现,实体 GIS 上传感器的等效频率响应特性与其吉赫兹横电磁波（gigahertz transverse electromagnetic,GTEM）小室内的等效高度曲线具有相似的频谱特征,实体 GIS上传感器的平均等效响应幅值与 GTEM小室内的平均有效高度具有相同的变化规律；结论认为,通过利用网络分析仪进行频响特性测试,可以有效反映特定型号 GIS 结构下的特高频传感器性能。基于该结果,提出了基于网络分析仪的 GIS局部放电监测特高频传感器现场校核方法。

Spot Check Technology for GIS Partial Discharge On-line Monitoring Ultra-high Frequency Sensor Based on Network Analyzer

It is an important issue to check performance of operation sensor for ensuring monitoring reliability of gas insula-ted metal enclosed switchgear partial discharge. Based on network analyzer and using sweep frequency method,response characteristic of the sensor installed on entitative GIS was tested and its relationship with average effective height of ultra-high frequency sensor was studied. By comparative analysis,it was discovered that equivalent frequency response character-istic of the sensor on entitative GIS was provided with similar frequency spectrum feature of equivalent height curve in giga-hertz transverse electromagnetic closet. In addition,change rules of average equivalent response amplitude of the sensor on entitative GIS were same as average effective height of GTEM closet. Conclusion was that it was able to effectively reflect performance of ultra-high frequency sensor with special typed GIS structure by using network analyzer to proceed testing on frequency response characteristic. On the basis of the above result,spot check method for GIS partial discharge detecting ultra-high frequency sensor based on network analyzer was proposed.