Journal ArticleDOI
Partial discharge localization in transformer windings using multi-conductor transmission line model
Ali Mazhab Jafari,Asghar Akbari +1 more
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TLDR
In this paper, a multi-conductor transmission line model (MTLM) of transformer winding has been used to find partial discharge (PD) location in transformers, and two methods for calculation of model parameters were studied and the most suitable method was chosen based on comparison between measured and calculated transfer functions of a 132 kV/20 kV transformer.About:Â
This article is published in Electric Power Systems Research.The article was published on 2008-06-01. It has received 37 citations till now. The article focuses on the topics: Partial discharge & Transformer.read more
Citations
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Journal ArticleDOI
Advancing new techniques for UHF PDdetection and localization in the power transformers in the factory tests
TL;DR: In this paper, a new design of UHF antennas is introduced which is suitable to be used on the transformers in the HV laboratories of the manufacturers to ensure the applicability of the new antenna, experimental UHF PD measurements are carried out on a transformer tank model as well as on real power transformers.
Journal ArticleDOI
A novel method for ultra-high-frequency partial discharge localization in power transformers using the particle swarm optimization algorithm
TL;DR: In this article, the authors proposed a method based on comparing the differences in the arrival times, to antennas in the transformer, of EM waves emitted from the PD source, and factoring in the influence of the transformer active part on the EM wave propagation.
Journal ArticleDOI
Partial Discharge Localization in Power Transformers Using Neuro-Fuzzy Technique
TL;DR: In this paper, a neuro-fuzzy technique that uses unsupervised pattern recognition was proposed to localize partial discharge (PD) source in power transformers, which showed a significant improvement in localizing PD for major types of PD compared to currently available techniques, such as orthogonal transforms and the calibration line method.
Journal ArticleDOI
Online condition monitoring of MV cable feeders using Rogowski coil sensors for PD measurements
Muhammad Shafiq,Muhammad Shafiq,Kimmo Kauhaniemi,Guillermo Robles,Muzamir Isa,Lauri Kumpulainen +5 more
TL;DR: An optimum design of a Rogowski coil that can measure the PD signals from medium voltage cables, its accessories, and the distribution transformers is proposed that leads to the development of an integrated monitoring model for the components of a MV cable feeder.
Journal ArticleDOI
Using correlation coefficients for locating partial discharge in power transformer
TL;DR: In this paper, the wavelet packets analysis was used as a tool for disk-to-disk partial discharge faults detection and localization in transformer windings, and a simulated model was developed for the transformer winding and the PD phenomenon mechanism.
References
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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
Exploring possibilities for characterization of power transformer insulation by frequency response analysis (FRA)
TL;DR: In this article, the authors explored the possibility of using frequency response analysis (FRA) technique to characterize the quality of transformer insulation and developed a single-phase and a three-phase lumped parameter circuit models.
Journal ArticleDOI
Calculation of self and mutual impedances between sections of transformer windings
TL;DR: In this paper, a frequency-dependent impedance formula, derived on the assumption of a solid homogeneous core, may be adapted to permit calculation of the self and mutual impedances of coil sections on a practical transformer core.
Patent
Partial discharge measurement
Mitsugi Aihara,Masaki Minami +1 more
TL;DR: In this paper, the authors proposed a method to enable the shortening of a closed loop in a measuring circuit with a metal sheath and a cable shield layer of a connection capacitor cable separated from those of a sample cable by electrically connecting conductors to each other at one-hand respective terminals of the cables.
Journal ArticleDOI
Analysis of very fast transient overvoltage in transformer winding
Y. Shibuya,S. Fujita,N. Hosokawa +2 more
TL;DR: 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.