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Abstract
This study investigates the overall and local vibration characteristics of disk-type windings in power transformers. The influence of clamping pressure relaxation and pressboard aging on windings' overall modal characteristics is studied. Individual conductors in a winding can vibrate independently and have the local vibration from that of overall windings. The local vibration characteristics of conductors under hoop tension, axial bending and the loss of clamping pressure are investigated. It is found that the clamping pressure relaxation and pressboard aging lead to the decrease of natural frequencies but the faulty conductors result in the increasing number of natural frequencies.
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