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Partial discharge

About: Partial discharge is a research topic. Over the lifetime, 13997 publications have been published within this topic receiving 102058 citations. The topic is also known as: PD.


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Proceedings ArticleDOI
K. Raja1, T. Floribert1
07 Apr 2002
TL;DR: In this article, UHF and acoustic partial discharge (PD) detection sensitivity assessment of paper/oil insulation configurations which are typical of power transformers is discussed, and the influence of the effect of barriers on the sensitivity is studied.
Abstract: This publication deals with UHF and acoustic partial discharge (PD) detection sensitivity assessment of paper/oil insulation configurations which are typical of power transformers. Even though the basis of this topic has been developed some time ago, the knowledge of the accuracy and limits of the sensitivity is of increasing importance for large power transformer test engineers who are confronted not only of reliable measurement of PD but also locating the source of discharges. Discharges representative of that occurring in a transformer were recorded by simulating them in a 220 kV test tank. The models simulated the basic insulation configuration of a transformer with multiple pressboard barriers and oil gaps. The influence of the effect of barriers on the sensitivity of UHF and acoustic PD detection were studied. Classical phase-resolved PD patterns were recorded alongside for analyzing the results of experiments. Experimental outcomes on these models were further verified on a 220 kV winding in a 400 kV test tank. Studies reveal that acoustic. sensitivity is seriously impaired by the presence of barriers, i.e. sensitivity of discharges shielded by insulating barriers is low as compared to those discharges in open oil volumes. For comparable distances, this sensitivity limitation is absent for UHF PD detection. Furthermore, merits and limits of individual methods are discussed that may lead to future research.

33 citations

Journal ArticleDOI
TL;DR: In this article, the influence of the enclosure diameter on partial discharge propagation characteristics was investigated using model GIS by varying the enclosure size, and an actual PD experiment was conducted in an L-shaped form to study the effect of GIS shape on PD-radiated electromagnetic (EM) waves.
Abstract: A method to detect partial discharge (PD) is considered effective for gas insulated switchgear (GIS) insulation diagnostics. In this paper, for a 154 kV model GIS, the influence of the enclosure diameter on PD propagation characteristics was initially investigated using model GIS by varying the enclosure size. Secondly, an experiment was conducted for metallic particles placed in different locations as a source of PD (particle adhering to the center conductor or free metallic particle). Thirdly, an actual PD experiment was conducted in an Lshaped form to study the influence of GIS shape on PD-radiated electromagnetic (EM) waves. In addition, in order to study the experimental results in detail, a simulation using the FD-TD method was conducted for comparison with these experimental results. Following the experiment, the larger the enclosure diameter, the greater the measured amplitude of PD having occurred around the center conductor. In addition, it emerged that, where the particle was close to the center conductor, EM waves propagating due to PD were less likely to be damped compared with the case where particles were placed on the bottom of the enclosure. Furthermore, following the investigation of the propagation characteristics in the L-shaped form, it emerged that, while a high frequency component of frequency exceeding that of the TEM wave component was reflected at the L-shaped part, the TEM wave component passed through almost unaffected by the latter. The propagation of the TEM mode component could be also found via FD-TD analysis.

33 citations

Journal ArticleDOI
TL;DR: In this paper, partial discharge (PD) inception voltage tests under impulse voltage waveforms are performed for low voltage electric vehicles and demonstrated with the high frequency and thermal impact on different types of motor insulation models.

33 citations

Journal ArticleDOI
TL;DR: It is shown that a representative insulation system performance picture could be drawn experimentally and used to enhance insulation design and manufacturing choices and to demonstrate the feasibility of PD test of the insulation system on a different type of motor under such conditions, both electrically and environmentally.
Abstract: This paper reports non-intrusive partial discharge (PD) investigations on aeronautic and electric vehicle motors fed by inverter drive under variable environmental conditions. A representative test procedure and experimental setup based on operating aeronautic conditions are essential to ensure the accuracy and reliability of PD test on aircraft systems to make informed decisions on insulation system design choice. The aim of this paper is to demonstrate the feasibility of PD test of the insulation system on a different type of motor under such conditions, both electrically and environmentally. To do so, a study of the pressure influence on the frequency spectrum of discharges was carried out. This analysis defines the ability of the non-intrusive measurement system to detect PDs in equipment operating at low pressure. This paper also presents some tests on an industrial test bench to validate the ability of the non-intrusive test method and the associated numerical signal processing to detect PD in motors fed by PWM voltage. Then, an analysis is carried out on a motor to find out which voltage magnitude trigger PD events. The study helps to realize the benefits of using an inverter based test method to find the limits of the insulation system. It is shown that a representative insulation system performance picture could be drawn experimentally and used to enhance insulation design and manufacturing choices. The paper concludes with an analysis of results and thoughts about future work regarding advanced test procedure.

33 citations

Journal ArticleDOI
TL;DR: In this paper, a multi-class support vector machine (SVM) was used to classify the type of discharge in a ternary plot, where each discharge has a unique location.
Abstract: Ultra-high-frequency signals are generated due to particle movement, floating conductors, corona, and surface discharges in gas-insulated switchgear. The ultra-high-frequency signal generated due to particle movement is independent of operating pressure and applied voltage. The bandwidth of the ultra-high-frequency signal formed due to corona and surface discharges vary with applied voltage. In a ternary plot, each type of discharge has a unique location. If a variety of discharge occurs simultaneously, it is difficult to classify the type of discharges through the ternary plot. It is demonstrated that the type of discharge can be classified efficiently by adopting a multi-class support vector machine.

33 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023306
2022780
2021376
2020677
2019835
2018860