电绝缘材料.交流电压耐久性评估.导言

[中文适用范围]： 该技术规范解释了电绝缘材料和系统耐压测试中涉及的许多因素。它描述了耐压图表，列出了说明其局限性的测试方法，并为根据测试结果评估绝缘材料和系统的交流耐压能力提供了指导。定义并解释了耐压中使用的术语。应该强调的是，当本技术规范涉及材料时，结果可能无法直接适用于绝缘系统的性能。耐压测试用于比较和评估绝缘材料在电气系统中的各种应用。确定电绝缘材料和系统承受交流电压应力的能力非常复杂。耐压测试的结果受到多种因素的影响，因此本技术规范仅应被视为试图提供耐压统一视图，以简化规划和分析。一些针对各种实际案例的文件已经存在，其他文件正在制定中。 [外文原描述]： IEC/TS 61251:2008(E) explains many of the factors involved in voltage endurance tests on electrical insulating materials and systems. It describes the voltage endurance graph, lists test methods illustrating their limitations and gives guidance for evaluating the a.c. voltage endurance of insulating materials and systems from the results of the tests. The terminology to be used in voltage endurance is defined and explained. It should be emphasized that where this technical specification is concerned with materials, the results may not be directly applicable to the performance of insulating systems. Voltage endurance tests are used to compare and evaluate insulating materials with regard to their various applications in electrical systems. Determining the ability of electrical insulating materials and systems to endure a.c. voltage stress is complex. The results of voltage endurance tests are influenced by many factors so this technical specification should only be considered as an attempt to present a unified view of voltage endurance for simplified planning and analysis. Some documents for the various practical cases exist and others are being developed. The main changes with respect to the previous edition are listed below: - extension of the scope to cover electrical insulating material and insulation systems; - removal of references to short time dielectric breakdown strength measurements as an indicator of voltage endurance.