特高压直流换流站分压器预试方法研究

Preventive test method research of UHV DC converter station DC voltage divider

为保持特高压直流分压器良好状态,以便发现问题及时处理,每年定期需要对其进行预防性试验。目前试验方法拆、接引线需要耗费大量人力、物力,既延长了停电时间,又因经常拆接引线可能造成设备及人员安全问题。结合特高压站安装在极线、中性线上的直流分压器自身结构特点,提出了不拆线测量高低压臂电容、分压比的试验方法,并在某变电站预防试验时运用该方法进行了实际测试。试验结果与历年试验数据对比表明,所提出的方法能在保证测试有效性的前提下,显著减少现场试验工作量。

In order to maintain a good state of the UHV DC voltage divider so as to find out the problem in time, it is necessary to carry out a preventive test on it every year. It not only prolongs the outage time and may cause equipment and personnel safety problems due to often disconnecting lead. Combined with the structure characteristics of DC voltage divider itself installed on polar line and neutral line, this paper presents a test method of measuring high-low voltage arm capacitance and partial pressure ratio without removing lead, and uses the method to the actual test of preventive test of substation. Test results are compared with the test data over the years, and the results show that the proposed method can guarantee the test validity and reduce the workload of field test.