Power transformer fault detection methods and Effects of edge burrs fault: a review

Altayef, Ehsan; Anayi, Fatih; Packianather, Michael

doi:10.1109/icacite53722.2022.9823815

Cited by 1 publication

(1 citation statement)

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“…Refs. [19,20] summarized the methods of interlaminar short circuit fault detection and edge burr fault detection. A method for detecting interlaminar short circuit faults and evaluating core quality using an injected flux probe was proposed, but the temperature effect caused by interlaminar short circuit was not investigated [21].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fine Fault Electrothermal Characteristics of Converter Transformer Reduced-Scale Model

Zhou,

Luo,

Zhu

et al. 2024

Energies

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Converter transformer is the key equipment in UHVDC transmission. If a local overheating fault occurs, it will inevitably form a local hot spot on the core, winding or other structural parts. Among these faults, multipoint grounding and interlaminar short circuit faults account for 30–50% of core accidents. The continuous overheating of 150–250 °C will cause ablation on the silicon steel sheet, which will destroy the insulation material and reduce the insulation performance. In severe cases, it will cause thermal expansion, resulting in local deformation or displacement of the core. Considering the scale of size and temperature parameters, the scale model of converter transformer is established based on the principle of constant magnetic flux density. By using the homogenization theory, the scaled model under multipoint grounding and interlaminar short circuit fault is simulated by electromagnetic heat. First, the single-phase four-column model of the core is established according to the scaled principle, and the core is refined. Secondly, taking the refined model as the research object, the magnetic thermal coupling simulation and analysis are carried out under multi-point grounding and interlaminar short circuit fault, and the magnetic density, eddy current loss and temperature distribution on each lamination are obtained. Finally, the correctness of the simulation is verified by the one-dimensional eddy current loss analytical equation, which provides a reference for the local overheating problem of converter transformers.

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Section: Introductionmentioning

confidence: 99%