Matériaux isolants imprégnés - Application de l?analyse des gaz dissous (DGA) lors d?essais en usine de matériels électriques (Edition 1.0) 是非强制性国家标准，您可以免费下载前三页
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.