填充矿物油的电气设备.溶解气体分析(DGA)用于电气设备工厂试验

[中文适用范围]： 本国际标准规定了油样取样程序、分析要求和程序，并推荐了溶解气体分析（DGA）在充满矿物绝缘油的新电力变压器、电抗器和互感器的工厂测试中应用的灵敏度、重复性和准确度标准。 DGA 测试已被指定。 DGA 技术在工厂测试中最有效和最有用的应用是在长期测试的性能期间，通常是电力变压器和电抗器的温升（热运行）和过载测试，以及互感器的脉冲测试。 DGA 对于长时间运行的过励磁测试也可能很有价值。短时介电测试之前和之后的 DGA 结果经验表明，DGA 通常不如检测局部放电的电学和声学方法敏感。然而，DGA 会指出这些局部放电何时对绝缘造成损害，并且可以通过检查检测到 [2]。 [外文原描述]： Specifies oil-sampling procedures, analysis requirements and procedures, and recommends sensitivity, repeatability and accuracy criteria for the application of dissolved gas analysis (DGA) to factory testing of new power transformers, reactors and instrument transformers filled with mineral insulating oil when DGA testing has been specified. The most effective and useful application of DGA techniques to factory testing is during the performance of long-term tests, typically temperature-rise (heat run) and overloading tests on power transformers and reactors, also impulse tests on instrument transformers. DGA may also be valuable for over-excitation tests run over an extended period of time. Experience with DGA results, before and after short-time dielectric tests, indicates that DGA is normally less sensitive than electrical and acoustic methods for detecting partial discharges. However, DGA will indicate when these partial discharges become harmful to the insulation and may be detected by inspection [2]. This edition includes the following significant technical changes with respect to the previous edition: a) the specific procedures used during factory tests (sampling location, sampling frequency, gas extraction and chromatographic analysis in the laboratory) are described in more detail; b) information is provided in Annex A concerning the residual gas contents recommended before thermal tests on power transformers, typical gas values observed during the tests and cases where gas formation during the tests was followed by problems in the transformers; c) typical values observed during chopped lightning-impulse tests on instrument transformers are indicated in Annex B.