不拆高压引线下“油—油”套管电缆出线变压器介损试验方法研究  

Study on the Dielectric Loss Test Methods of “Oil-Oil”Bushing Cable Outgoing Line Transformers with High Voltage Line

作　　者：韩旭涛 刘泽辉[1] 李军浩[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高压电器》2016年第4期117-122,共6页High Voltage Apparatus

摘　　要：文中主要研究了如何在不拆除高压引线下开展"油—油"套管电缆出线变压器的介损试验。根据相关规程和现场情况,通过绕组中性点加压开展介损试验,并通过建立等效电路对试验结果进行分析。主要得到以下结论:不短接绕组两端开展介损试验时测得的电容值变小,tanδ变大,但变化可忽略不计;反接法测量时,电缆使得电容值变大,tanδ变小,而PT(电压互感器)使得电容值变小,tanδ变大;正接法测量时,可排除电缆和PT的影响,适用于开展不拆高压引线时的变压器介损试验。The method of the dielectric loss test of transformers with ＂oil-oil＂ bushing-cable leading-out without disassembling high voltage lead is mainly studied in this paper. According to the related standards and the filed situation, dielectric loss is tested by applying voltage on the neutral point of the high voltage winding. The results are analyzed by building equivalent circuit model. It can be concluded that the measured capacitance is larger and the value of the tarts is smaller because of there is no short-circuiting connecting between the ends of the winding, but the variation can be ignored. It is also shown that cable leads a lager capacitance and a smaller tanS, while the PT has the opposite effects when using reverse connection method. When positive connection method is used, the impact of cable and PT is excluded, so this method is more suitable for the dielectric loss test without disassem-bling high voltage lead.

关 键 词：变压器 “油—油”套管 不拆高压引线 电缆 介损试验 

分 类 号：TM406[电气工程—电器]