Online detection of windings distortion in power transformers by direct vibration measurement using a thin fiber optics sensor

Winding distortions can be mechanically induced during transportation, by large transient currents caused by lightning events or short-circuits, or as a result of gradual clamping looseness as the transformers age, after many loading and unloading cycles. Winding distortions lead to increased electromagnetic forces between the windings and the core, giving… (More)