1.绝缘在线检测技术研究的开展 电力系统的安全运行与设备状况紧密相关,而电力设备的可靠性在很大程度上取决于设备的绝缘性能,根据我国对大型电力变压器事故的分析结果,其中由于绝缘而引起的事故占80％以上。为了防止事故的发生,长期以来,对电力系统中运行着的设备一直坚持定期进行绝缘预防性试验。这对保证设备在电力系统中安全可靠地运行,防止事故的发生起了很好的作用,但预防性试验却存在以下问题: (1)试验电压偏低,等效性差。大部分试验项目的试验电压与设备的工作电压相差极大。例如对220 1. Insulation on-line detection technology to carry out research on the safe operation of power systems and equipment conditions are closely related to the reliability of power equipment depends largely on the insulation properties of equipment, according to China’s analysis of large power transformer accidents, including Accidents caused by insulation accounted for more than 80%. In order to prevent accidents, equipment running on the power system has long insisted on regular insulation preventive tests. This is to ensure that equipment in the power system safe and reliable operation, to prevent the occurrence of the accident played a good role, but the preventive test has the following problems: (1) test voltage is low, the equivalence is poor. The test voltage of most of the test items is very different from the working voltage of the device. For example, 220