Investigations on Vibrations of Power Transformers
نویسندگان
چکیده
Service reliability in electrical power networks is of crucial importance and depends on the quality and availability of electrical equipment. Operation resources like power transformers have to be considered, representing the intersections of energy networks. Regarding the age of power transformers e.g. used in the German grid surveillance is gaining importance. An approach for evaluating the transformer’s status using vibrations is presented in this contribution discussing basic research of transformer vibrations. Vibrations are caused by voltage-dependent and load-dependent effects which lead to oscillations in mechanical structures like the active part of a power transformer. Vibrations are measured on the outside using accelerometers attached to the tank wall. In this contribution vibration measurement is performed at a 125 MVA power transformer using an acceleration sensor. Vibrations are recorded in time domain and analysed in frequency domain. Two approaches for vibration determination are presented. One regards the time depending trend of vibrations at different loads. The second uses statistical methods for comparison of measurements at comparable load conditions.
منابع مشابه
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