A feasibility study on estimating induced charge of partial discharges in transformer windings adjacent to its origin

Seifi, Sahand; Werle, Peter; Akmal, Amir Abbas Shayegani; Mohseni, Hossein; Borsi, H.

doi:10.1016/j.ijepes.2021.106899

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…Frequency response analysis is one of the new and powerful methods in troubleshooting and monitoring power transformers that studies the transfer function of a system in the frequency domain and based on how they are changed and analyzed, the types of faults can be identified and detected. Hence, before the fault reaches critical stages, it can be detected and it is possible to be fixed [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electrical modeling of high voltage windings of power transformers for online partial discharge localization

Hamidi

Hamidi²,

Setayeshmehr³

2022

Preprint

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Partial Discharge (PD) is one of the most important factors in the gradual destruction of transformer insulation, more importantly if the problem is not resolved can cause complete insulation failure. Physical localization of the fault inside the transformers in terms of saving repair time and cost is important. In this paper, by modeling a high voltage winding of a power transformer as a single-layer disk winding with air core the localization of PD is investigated. In this configuration, winding consists of six disks. Here, by applying impulse voltage as PD signal to the beginning of each disk, the voltages are measured and saved online at the bushing and neutral ends of the winding. By using the curve fitting method, the equations of PD signals at these two ends are extracted, then by computing transfer function in Laplace domain the magnitude of this transfer function are saved as a reference diagram. We have done this for all 6 disks. When PD occurred at winding by measuring voltages at bushing and neutral ends and drawing transfer function and comparison with reference diagrams, each diagram that has minimum difference with drawn diagram is the place of PD. Finally, the proposed method is validated with a laboratory winding with six disks.

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Section: Introductionmentioning

confidence: 99%