Scope and ObjectThis International Standard specifies oil-sampling procedures@ analysis requirements and procedures and recommends sensitivity and precision criteria for the application of dissolved gas analysis (DGA) to factory testing of power transformers@ reactors and instrument transformers when DGA testing has been specified.DGA is a technique for detecting certain types of faults in oil-filled electrical equipment which may not be detected by conventional methods.The most effective and useful application of DGA techniques to factory testing is during the performance of long-term tests@ typically temperature-rise and overloading tests on power transformers and reactors@ also chopped lightning-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 and accurate than electrical methods for detecting dielectric failures. However@ DGA may sometimes be a valuable source of relevant information on abnormal equipment behaviour.
61181 AMD 1-2012由IEC - International Electrotechnical Commission 发布于 2012-02-01,并于 2012-03-28 实施。
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