IEC 61181:2007 矿物油充电电气设备 - 溶解气体分析（dga）在电气设备上的工厂测试应用

标准编号：IEC 61181:2007

中文名称：矿物油充电电气设备 - 溶解气体分析（dga）在电气设备上的工厂测试应用

英文名称：Mineral oil-filled electrical equipment - Application of dissolved gas analysis (DGA) to factory tests on electrical equipment

发布日期：2007-02-23

标准范围

规定了油取样程序、分析要求和程序，并建议在规定了溶解气体分析（DGA）测试时，将溶解气体分析（DGA）应用于充满矿物绝缘油的新电力变压器、电抗器和仪表变压器的工厂测试的灵敏度、可重复性和准确性标准。DGA技术在工厂测试中最有效、最有用的应用是在长期测试期间，通常是对电力变压器和电抗器进行温升（热运行）和过载测试，以及对仪表变压器进行脉冲测试。DGA对于长时间运行的过励磁测试也很有价值。在短时介电试验前后，DGA结果的经验表明，DGA在检测局部放电方面通常不如电声方法敏感。然而，DGA将指示这些局部放电何时对绝缘有害，并可通过检查进行检测[2]。与上一版相比，本版包括以下重大技术变更:a） 更详细地描述了工厂试验期间使用的具体程序（取样位置、取样频率、实验室中的气体提取和色谱分析）；b） 附录A中提供了有关电力变压器热试验前建议的残余气体含量、试验期间观察到的典型气体值以及试验期间气体形成后变压器出现问题的情况的信息；c） 斩波闪电期间观察到的典型值-仪表变压器的脉冲试验如附录B所示。

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.

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