Journal ArticleDOI
Analysis of very fast transient overvoltage in transformer winding
Y. Shibuya,S. Fujita,N. Hosokawa +2 more
- Vol. 144, Iss: 5, pp 461-468
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TLDR
In this paper, a practical method to analyze voltage oscillations inside power transformers connected to them is developed based on multiconductor transmission-line theory. But the analysis is conducted in two steps in the frequency domain: first, the whole transformer winding is simulated using a single transmission line model; and secondly, the phenomena in the first coil are analyzed using a multiconductor transceivers.Abstract:
Owing to the operation of disconnector switches, very fast transient overvoltages can generate a voltage oscillation inside power transformers connected to them. A practical method to analyse such oscillations is developed based on multiconductor transmission-line theory. The analysis is conducted in two steps in the frequency domain: first the whole transformer winding is simulated using a single transmission-line model; and secondly, the phenomena in the first coil are analysed using a multiconductor transmission-line model. The numerical results for an actual 525 kV power transformer conform with experiments. The interturn voltage shows a resonance determined by the travelling waves in the coil. The propagation of travelling waves is visualised using time domain analysis.read more
Citations
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Journal ArticleDOI
Transfer function method to diagnose axial displacement and radial deformation of transformer windings
TL;DR: In this article, a transfer function method is presented as a tool to detect axial displacement and radial deformation of transformer windings using two test transformers and detailed mathematical models were developed for the test objects and a comparison was carried out between measured and calculated results.
Journal ArticleDOI
Analysis of Very Fast Transients in Layer-Type Transformer Windings
TL;DR: In this article, the authors deal with the measurement, modeling, and simulation of very fast transient overvoltages in layer-type distribution transformer windings using a single-phase test transformer equipped with measuring points along the winding.
Journal ArticleDOI
Computation of very fast transient overvoltages in transformer windings
TL;DR: In this paper, the authors proposed a hybrid model, which is a combination of the multi-conductor transmission line model and the single-transmission line model, for the computation of very fast transient overvoltages in transformer windings.
Journal ArticleDOI
Comparison of Transformer Detailed Models for Fast and Very Fast Transient Studies
TL;DR: In this article, the authors compared the two well-known multiconductor transmission line (MTL) and lumped parameter detailed (RLC ladder network) models to model the highvoltage (HV) winding of a 220/35-kV, 50-MVA transformer.
Journal ArticleDOI
Experimental investigation of high frequency voltage oscillation in transformer windings
TL;DR: In this paper, the interturn voltages of 500 kV class transformers were measured using an optical fiber transmission system and it was found that an interturn traveling wave is generated at either end of the coil and propagates along the winding.
References
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Journal ArticleDOI
Multiconductor transmission-line model for the line-end coil of large AC machines
P.G. McLaren,H. Oraee +1 more
TL;DR: In this paper, a PE2D finite-elements field package is used to calculate the distributed L and C parameters of a multiconductor transmission-line model for the line-end coil of a large AC motor.
Journal ArticleDOI
Performance of traveling waves in coils and windings
TL;DR: A simplified but nevertheless rigorous conception of the wave propagation within such windings may therefore be advantageous as mentioned in this paper, and it may be used for coils in communication circuits as well. But it is not suitable for the use of windings in communication networks.