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1、,第4章 绝缘的预防性试验 Chapter 4. Preventive test of insulation,电气设备绝缘预防性试验已成为保证现代电力系统安全可靠运行的重要措施之一。这种试验除了在新设备投入运行前在交接、安装、调试等环节中进行外，更多的是对运行中的各种电气设备的绝缘定期进行检查，以便及早发现绝缘缺陷，及时更换或修复，防患于未然。,The preventive test of insulation of electrical equipment has become one of important measure for modern power system to ensur
2、e safety and reliability. This testing is more used to inspect various electric equipments insulation regularly besides it is used for handover、installation and debugging before the new equipment operating. So we can find the insulation defect early and replace or repair it in time.,绝缘故障大多因内部存在缺陷而引起
3、，有些绝缘缺陷是在设备制造过程中产生和潜存下来的，还有一些绝缘缺陷则是在设备运行过程中由外界影响因素的作用下逐渐发展和形成的。就其存在的形态而言，绝缘缺陷为两大类：集中性缺陷 ；分散性缺陷 Insulation faults are mostly caused by internal defect. Some of insulation faults are generated in the device manufacturing progress and left and others are developing and forming because of influencing ex
4、ternal factor during the device operating. In terms of its form of existence , Insulation defect is divided into two categories : concentrated defects; Dispersion defects.,由于缺陷种类很多、影响各异，所以绝缘预防性试验的项目也就多种多样。每个项目所反映的绝缘状态和缺陷性质亦各不相同，故同一设备往往要接受多项试验，才能作出比较准确的判断和结论。 Because of kinds of insulation defect var
5、ious and affect different ,The project of preventive test of insulation has many kinds. Each project reflects the condition of insulation and nature of defect are also different .So the same device is often subjected to a number of pilots in order to make more accurate judgments and conclusions.,4.1
6、 绝缘电阻、吸收比与泄漏电流的测量 4.1 Measurement of insulation resistance, absorption and leakage current 4.2 介质损耗角正切的测量 4.2 Measurement of dielectric loss tangent 4.3 局部放电的测量 4.3 Measurement of partial discharge 4.4 绝缘油性能检测 4.4 Detecting the performance of the insulating oil 习题与思考题 Exercises and FAQs,本章内容 Contents in this section,
