换流变现场局部放电检测仪器的研究

Research on field partial discharge detector based on Rheology

在现场换流变压器局部放电试验时，换流站经常部分或全部带电，局部放电试验的背景干扰很大且成分比交流变电站复杂得多，给换流变压器局部放电试验的开展带来很大困难。目前，一般采用开窗等人为技术手段剔除背景干扰，试验结果判断的主观性较大。通过现场实测和理论研究相结合的方法，分析换流站带电情况下开展换流变压器局部放电试验的各种背景干扰的类型、特点、成因、幅值频率特性等，根据各种典型干扰的来源和特征，针对性地提出有效的干扰抑制措施，并在上述基础上研究换流站换流变压器局部放电试验干扰抑制算法和后台软件处理方法，开发更加先进的换流变压器现场局部放电检测仪器并现场应用，最终提高换流变压器现场局放试验的准确性和试验效率。

In converter transformer on-site partial discharge test, it is very difficult to test partial discharge of converter transformer, because the converter station often part or all charged, and the background interference of partial discharge test is very large, and its composition is more complex than AC substation. At present, people usually use artificial methods like Windowing Technique to eliminate background interference, the subjective judgment of the test results is relatively large. By combining on field test and theoretical research, the types, characteristics, causes, amplitude and frequency characteristics of partial discharge test＇ s various background interference are analyzed. According to the sources and characteristics of typical interference, some effective interference suppression measures are proposed. And the partial discharge test of interference suppression algorithm and background processing software are studied. A more advanced on- site partial discharge detector for converter transformer is developed, and the field application shows that the accuracy and the testing efficiency are improved.