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access icon free Determination of transformer HV winding axial displacement occurrence, direction, and extent using time-domain analysis of UWB signals

© The Institution of Engineering and Technology
Received 20/03/2017, Accepted 07/02/2018, Revised 05/01/2018, Published 13/02/2018

In this study, a new method is proposed to monitor axial displacement (AD) of transformer high-voltage (HV) winding using electromagnetic waves. The proposed method employed two receiving antennas and one transmitting antenna to exchange ultra-wideband (UWB) signals with the winding. The magnitude Euclidean distance (MED) index is used to compare the received signals when winding is sound or defective. Two receiving antennas receive signals at two different positions upon ADs in winding which causes different values in the amplitude of the received signals as well as the MED index of two receiving antennas. Hence, taking advantage of this feature, the occurrence, direction, and extent of AD can be identified. The proposed method is assessed using a simulation model. Then, experiments are conducted on an actual transformer winding using an experimental setup.

Inspec keywords: ultra wideband antennas; transformer windings; transmitting antennas; receiving antennas

Other keywords: axial displacement occurrence; UWB signals; electromagnetic waves; transmitting antenna; receiving antennas; magnitude Euclidean distance index; transformer HV winding; ultra-wideband signals; transformer high-voltage winding; time-domain analysis

Subjects: Transformers and reactors; Inductors and transformers; Antennas

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