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Partial Discharge Monitoring and Analysis
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Partial Discharge Monitoring and Analysis

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 8831

Special Issue Editor

Prof. Trevor Blackburn

E-Mail Website
Guest Editor
School of Electrical Engineering, University of New South Wales, Sydney 2052, Australia
Interests: distribution systems; high voltage engineering; electromagnetics; transformers; substations; electrical insulation; partial discharges; lightning; switchgear; thermal performance; arc discharges

Special Issue Information

Dear Colleagues,

Since its first development in the late 1940s, partial discharge monitoring has become one of the best, if not the best, diagnostic techniques for the assessment of high voltage electrical insulation. It has two advantages over other insulation diagnostics, namely: it is a real time monitor of insulation conditions, and partial discharges can be detected by a wide variety of different techniques, including direct electrical, ultrasonic detection, optical methods, and VHF and UHF methods using aerial sensors.

The general theme of this Special Issue on partial discharge diagnostics will be on new PD applications and analysis. It is aimed at papers that cover modern and novel partial discharge methods and new application techniques where the interpretation of results is less well-developed than in the traditional electrical methods. These include, for example, the interpretation of the partial discharge results obtained using VLF excitation, and the partial discharge testing and condition assessment methods of HVDC equipment insulation. Papers that investigate the use of on-line monitoring and intelligent systems of analysis are welcome for both traditional and non-traditional PD methods. Research covering on-line monitoring and the analysis of results using data mining and big data methods are also welcome. The scope includes distribution and transmission level voltages, as well as all types of HV equipment items.

Prof. Trevor Blackburn
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Partial discharges
  • PD monitoring
  • PD analysis
  • HV insulation
  • Fault identification
  • arc discharges

Published Papers (4 papers)

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Research

14 pages, 2969 KiB  
Article
A Comparative Study of Time-Evolution Characteristics of Single and Double Cavity Partial Discharges
by Isaac Kwabena Kyere, Cuthbert Nyamupangedengu and Andrew Graham Swanson
Energies 2024, 17(8), 1905; https://doi.org/10.3390/en17081905 - 17 Apr 2024
Viewed by 404
Abstract
Partial discharge (PD) in cavities can lead to a breakdown in solid insulation and, therefore, indicate the onset of aging in electrical equipment. It is necessary to investigate the activity of single- and double-cavity PD under aging conditions, which is the focus of [...] Read more.
Partial discharge (PD) in cavities can lead to a breakdown in solid insulation and, therefore, indicate the onset of aging in electrical equipment. It is necessary to investigate the activity of single- and double-cavity PD under aging conditions, which is the focus of this study. The results obtained can be useful in monitoring the condition of insulation systems. The factors (pressure, effective work function, and charge decay time constant) that influence PD behaviour under different test conditions were permutated in a PD model. The simulation results agree with measurements obtained for the same applied voltage. The model can generate PD pulse distribution shapes similar to the measured PD of single and double cavities. Both turtle-like and rabbit-ear-like phase-resolved PD (PRPD) patterns were observed during the aging process of the samples in both double and single cavities. This study concludes that the identification of the PD pattern achieved in this work for closely coupled cavities is a step towards characterizing multiple defects phenomena through PD evolution patterns. Full article
(This article belongs to the Special Issue Partial Discharge Monitoring and Analysis)
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20 pages, 8690 KiB  
Article
Impacts of Harmonic Voltage Distortions on the Dynamic Behavior and the PRPD Patterns of Partial Discharges in an Air Cavity Inside a Solid Dielectric Material
by Gustavo de Oliveira Machado, Luciano Coutinho Gomes, Augusto Wohlgemuth Fleury Veloso da Silveira, Carlos Eduardo Tavares and Darizon Alves de Andrade
Energies 2022, 15(7), 2650; https://doi.org/10.3390/en15072650 - 4 Apr 2022
Cited by 6 | Viewed by 2209
Abstract
The monitoring of partial discharges (PDs) is one of the main methods used worldwide for evaluation and diagnosis of the insulation conditions in equipment powered by medium and high voltages. The occurrence of PDs is usually an indication of the appearance of insulation [...] Read more.
The monitoring of partial discharges (PDs) is one of the main methods used worldwide for evaluation and diagnosis of the insulation conditions in equipment powered by medium and high voltages. The occurrence of PDs is usually an indication of the appearance of insulation defects, which over time can compromise the dielectric withstand of the material used, increasing the probability of complete breakdown. In general, laboratory tests for detecting and registering PDs are carried out using purely sinusoidal voltages. However, it is very common for an electrical asset to be subjected at some point in its operating life to voltages distorted by harmonic components. Some studies reported in the literature reveal that harmonic distortions can affect the PDs’ characteristics, nevertheless, the effects of individual harmonic components on PDs still need to be analyzed. In this context, this paper proposes to evaluate the impacts of harmonic voltage distortions on the dynamic behavior and the phase-resolved partial discharge (PRPD) patterns of PDs in an air cavity within a solid dielectric material. For this, a simulation model was implemented, which was used to analyze the effects of applying distorted voltages composed of different harmonic orders (third, fifth, and seventh) and distinct levels of distortion (1%, 3%, 5%, 10%, 15%, and 20%). In addition, the influence of the third harmonic phase angle on PDs is also analyzed. The results extracted from the simulations revealed that the harmonic distortions caused changes in the numbers of PDs per cycle, in the mean apparent charges of the PDs per cycle, and in the PRPD patterns’ characteristics. These changes were very significant for higher distortion levels, which in practice may impair the interpretation of PD measurement records for the diagnosis of the condition of the insulation system. Full article
(This article belongs to the Special Issue Partial Discharge Monitoring and Analysis)
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17 pages, 778 KiB  
Article
Analysis of Cavity PD Characteristics’ Sensitivity to Changes in the Supply Voltage Frequency
by Tapiwa Venge and Cuthbert Nyamupangedengu
Energies 2021, 14(2), 478; https://doi.org/10.3390/en14020478 - 18 Jan 2021
Cited by 4 | Viewed by 2128
Abstract
The supply voltage frequency effect on partial discharge (PD) phenomena has continued to draw research interest. Although most high voltage equipment operates at power frequency (50/60 Hz), testing is often done at different frequencies for various reasons. Despite some agreements and inconsistencies for [...] Read more.
The supply voltage frequency effect on partial discharge (PD) phenomena has continued to draw research interest. Although most high voltage equipment operates at power frequency (50/60 Hz), testing is often done at different frequencies for various reasons. Despite some agreements and inconsistencies for the research findings of PD activity’s frequency dependence, there has been consensus on the recognition of the discharge mechanism parameters that influence how the supply voltage frequency affects PD activity. These parameters include statistical time lag, discharge area surface conductivity, and the residual charge decay. In this paper, a 3-capacitor model (ABC) is used to simulate how the changes in the discharge mechanism parameters influence PD characteristics as a function of the supply voltage frequency. The findings are that the phase-resolved partial discharge pattern (PRPDP) and PD repetition rate (PDRR) characteristics are more sensitive to variations in the probability of the seed electron availability at higher frequencies of the supply voltage. The opposite trend is observed for the cavity surface resistance. At lower resistance of cavity surface, the PRPDP and PDRR characteristics are more sensitive to changes in the supply voltage frequency than at higher resistances. The paper also confirms that incorporating equivalent resistances in the ABC model makes it more authentic than the model comprising of capacitors only. Full article
(This article belongs to the Special Issue Partial Discharge Monitoring and Analysis)
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20 pages, 2026 KiB  
Article
Review of Partial Discharge Activity Considering Very-Low Frequency and Damped Applied Voltage
by Mohamad Ghaffarian Niasar, Xiaolei Wang and Respicius Clemence Kiiza
Energies 2021, 14(2), 440; https://doi.org/10.3390/en14020440 - 15 Jan 2021
Cited by 10 | Viewed by 3063
Abstract
When detecting the presence of partial discharge (PD) activity in the insulation system in high-voltage equipment, the excitation voltages at variable frequency have been widely used instead of power-frequency (50/60 Hz) sinusoidal voltage in order to reduce the charging power. This work reviews [...] Read more.
When detecting the presence of partial discharge (PD) activity in the insulation system in high-voltage equipment, the excitation voltages at variable frequency have been widely used instead of power-frequency (50/60 Hz) sinusoidal voltage in order to reduce the charging power. This work reviews the relevant research on PD activity at very low frequency (VLF) method, including sinusoidal or cosine-rectangular voltage shape, and damped AC (DAC) method. Based on the research history and development status, some major PD characteristics, such as PD inception voltage (PDIV), PD amplitude, PD charge, PD phase-resolved pattern, and several hot issues, such as surface charge decay and statistical time lag, have been discussed. Moreover, the advantages, disadvantages, and applied conditions of two reviewed methods has been summarized. Finally, the prospects have been made on the main development trends of this research field in the future. Full article
(This article belongs to the Special Issue Partial Discharge Monitoring and Analysis)
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