Multi-segment Winding Application for Axial Short Circuit Force Reduction Under Tap Changer Operation in HTS Transformers

Moradnouri, Ahmad; Vakilian, Mehdi; Hekmati, Arsalan; Fardmanesh, Mehdi

doi:10.1007/s10948-019-5109-1

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…High-temperature superconducting (HTS) transformers have the advantages of small size, light weight and high efficiency, but they are also more susceptible to short-circuit electromagnetic forces. In the literature [11][12][13][14], the electromagnetic force distribution in HTS transformers is analyzed by means of the finite element method, and the multisegment winding method and its structural parameter optimization are used to effectively reduce the impact of axial short circuit forces. According to research published in the literature [15][16], which examined the deformation pattern of windings under short-circuit impact, the radial force is greater in low-voltage (LV) windings, which are more prone to the radial inward concave deformation, and relatively less in highvoltage (HV) windings.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Transformer Winding Deformation and Its Locations With High Probability of Occurrence

et al. 2023

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Power transformer, as a crucial equipment for power transmission, frequently suffers winding deformation defects, owing to the impact of huge external short-circuit current in actual operation. To resist the rapid deterioration of the defects, online monitoring for winding states is imperative, depending on a thorough understanding of the deformation defects. Unfortunately, there are not much related research on the deformation form and location, as two key objects online diagnosed. In this paper, we concentrate on the analysis of winding deformation and investigation of its high-probability location to deeply understand the winding deformation. For the form of the deformation, a three-dimensional finite element model of the transformer is established to obtain the form and extent of the short-circuit impact force, and a buckling model of the low-voltage winding is designed to analyze the mechanism and form of winding deformation under the impact of huge force induced by short-circuit current. For the location of the deformation, the threedimensional simulation models are established to analyze the force characteristics of different winding structures in three locations (the conductor transposition area, the area with imbalanced amp-turns and the area with uneven circumferential distribution of force). Then we clarify the possibility of winding deformation in these areas, defined as high-probability locations. Finally, the analyzed results are found to be highly consistent with the actual winding deformation, demonstrating the correctness of the research methods and conclusions. Next stage, the results will provide effective theoretical support for online diagnosis of winding deformation and optimal design of winding structure.

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Section: Introductionmentioning

confidence: 99%

Analysis of Transformer Winding Deformation and Its Locations With High Probability of Occurrence

et al. 2023

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“…Ahmadpour A. modelled and analysed a 630 kVA HTS distribution transformer under various conditions by FEM [17]. Moradnouri A reduced the short circuit force, especially the axial short circuit force, by optimising the design of the HTS transformer and analysing the leakage flux characteristics [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ability to withstand short circuit and development of large capacity 500 kV autotransformer

Tan

et al. 2022

IET Electric Power Appl

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Once the short circuit damage accident of a large capacity 500 kV transformer occurs suddenly, it will seriously affect the safe operation of the power grid. The article expounds on the calculation principle and evaluation method of the transformer's ability to withstand short circuit, then introduces the design structure of 400 MVA/500 kV short circuit autotransformer and calculates the electromagnetic force and evaluates the ability to withstand short circuit under high voltage ‐ medium voltage (HV‐MV) and medium voltage ‐ low voltage (MV‐LV) conditions. By comparing with typical 110 kV and 220 kV transformers, the short‐circuit characteristics are analysed, the control strategy is proposed, and the largest capacity short circuit prototype with 400 MVA/500 kV autotransformer is developed. Last, the sudden short circuit test is carried out in the large current test centre. The results show that the large capacity autotransformer passed the big current impulse under HV‐MV and MV‐LV short circuit conditions for the first time in the world, and all indicators are good, which confirms the accuracy of the strength check and the effectiveness of the short circuit evaluation method and also proves that the 500 kV autotransformer has strong strength to withstand short circuits.

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“…In turn, however, this could lead to failures caused by dielectric stress. An overload of short-circuit currents to the transformer could also cause it to malfunction, and it is, therefore, important to review the inrush current forces and short circuit forces [12][13][14]. In addition, the analysis of the vibration levels of the transformer windings is critical to diagnosing the faults within a transformer.…”

Section: Introductionmentioning

confidence: 99%

The Identification Method of the Winding Vibration Faults of Dry-Type Transformers

et al. 2022

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To identify the four typical faults of dry-type transformer winding insulations, looseness, deformation and eccentricity, this study establishes the electric magnetic force multi-physical field simulation model of a dry-type transformer winding under the four typical faults with COMSOL software, based on the vibration mechanism of an SCB10-1000/10 dry-type transformer. Through the multi-physical field coupling calculation, the comparative relationship between the vibration acceleration of the winding under the four kinds of faults and the normal working state is obtained. The results show that the amplitude growth rate of the fundamental frequency or harmonic frequency of the acceleration signal under four kinds of faults is different from that under normal conditions. Therefore, the threshold value of the fundamental frequency or harmonic increment of the acceleration signal is introduced to describe the growth rate of the acceleration signal relative to normal conditions. Finally, four typical faults are identified with different threshold ranges of acceleration increment under faults, laying a foundation for the fault diagnosis of transformer winding vibrations.

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Multi-segment Winding Application for Axial Short Circuit Force Reduction Under Tap Changer Operation in HTS Transformers

Cited by 15 publications

References 24 publications

Analysis of Transformer Winding Deformation and Its Locations With High Probability of Occurrence

Analysis of Transformer Winding Deformation and Its Locations With High Probability of Occurrence

Evaluation of ability to withstand short circuit and development of large capacity 500 kV autotransformer

The Identification Method of the Winding Vibration Faults of Dry-Type Transformers

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