Dissertations / Theses on the topic 'Partial discharge (PD)'
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Hayakawa, N., Y. Sugimori, and H. Okubo. "Partial discharge current pulse waveform analysis (PD-CPWA) based on PD mechanisms in solid and gas media." IEEE, 2005. http://hdl.handle.net/2237/6827.
Full textNikjoo, Roya. "Dielectric Response and Partial Discharge Diagnostics of Insulation Systems by Utilizing High Voltage Impulses." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187632.
Full textQC 20160525
Okubo, Hitoshi, Fuminobu Shimizu, and Naoki Hayakawa. "Estimation of partial discharge inception voltage of magnet wires under inverter surge voltage by volume-time theory." IEEE, 2012. http://hdl.handle.net/2237/20735.
Full textGhaffarian, Niasar Mohamad. "Partial Discharge Signatures of Defects in Insulation Systems Consisting of Oil and Oil-impregnated Paper." Licentiate thesis, KTH, Elektroteknisk teori och konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105785.
Full textQC 20121129
Tsai, Shu-Jen Steven. "Power Transformer Partial Discharge (PD) Acoustic Signal Detection using Fiber Sensors and Wavelet Analysis, Modeling, and Simulation." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35983.
Full textMaster of Science
Lazarevich, Alison Kay. "Partial Discharge Detection and Localization in High Voltage Transformers Using an Optical Acoustic Sensor." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/32624.
Full textMaster of Science
Hayakawa, Naoki, 直樹 早川, Hitoshi Okubo, and 仁. 大久保. "Feature article - Lifetime Characteristics of Nanocomposite Enameled Wire Under Surge Voltage Application." IEEE, 2008. http://hdl.handle.net/2237/11172.
Full textRumi, Alberto. "Partial Discharge Inception Voltage in Converter-Fed Machines for the More Electric Aircraft." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Find full textSong, Lijun. "Detection and Position Location of Partial Discharges in Transformers Using Fiber Optic Sensors." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/35928.
Full textMaster of Science
Kumar, Ameet. "Critical points in the More Electric Aircraft (MEA) converter-machine chain." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23815/.
Full textIsaksson, Henrik. "Tillståndsbedömning av kablar i mellanspänningsnät : En sammanställning av olika metoder för kabeldiagnostiska mätningar och tester." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-64574.
Full textThe work in this bachelor’s thesis was conducted at Bodens Energi Nät AB during the spring of 2017. The report describes common methods available for testing and diagnostic measurements of electric power cables. Bodens Energi Nät manages a medium voltage power grid which consists of around 700 kilometers of power lines and about 200 kilometers of cables. A large part of these cables have an insulating layer consisting of cross-linked polyethylene (XLPE) and originates from the 1970s and the 1980s. These particular XLPE cables have a higher than normal tendency to develop problems with water trees. Water trees can be described as tree-shaped structures forming inside the insulating layer of the cable in the presence of an electrical field and water. Issues with water trees leads to local degradation of the dielectric material in the cable and usually ends with a phase-to-ground fault. The purpose of this thesis is to examine and describe different methods for diagnostic measurements of medium voltage cables. Through the use of a literature study the following questions will be answered: Which methods are available for diagnostic measurements and what properties can be measured? What are the strengths and weaknesses for each of these methods? Can measurements be performed on cables on-line or is it required to disconnect the cables from the grid before any measurements can be performed?In the case of on-line testing, which methods does this apply to? The overall disposition of this thesis starts with a general description of power cables including XLPE cables, as well as aging mechanisms in extruded cables. Subsequent chapters describes testing methods such as cable sheath testing, hipot testing using different types of voltages, measurements of the dielectric dissipation factor tan , as well as partial discharge testing. Chapter 5 discloses the results from some different tan measurements including a partial discharge measurement. A short description and explanation is included with every figure. Measuring the dielectric dissipation factor yields information about the total condition of the insulation. Partial discharge offers information regarding the location of irregularities, cavities and impurities within the insulation. It is important to have in mind that each of these methods on its own will not be able to identify all types of defects. Therefore it may be required to carry out several measurements using different types of methods in order to get a general idea of the condition of the cable. Methods for cable diagnostic measurements should be seen as a tool to get an estimate about the total condition of a power cable and is not considered a fail safe way to determine the operational ability.
Ouss, Etienne. "Caractérisation des décharges partielles et identification des défauts dans les PSEM sous haute tension continue." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC024.
Full textThe framework of this thesis is the monitoring of High-Voltage, Direct Current (HVDC) Gas-Insulated Substations (GIS). The availability of these equipment is crucial for electrical networks operators. That is why they need a preventive diagnosis tool. The solution must be able to detect and identify the insulation defects, so that an appropriate maintenance can be planned. The last 40 years have seen Partial Discharges (PD) measurement become a classic monitoring tool for AC GIS. Unfortunately, there is a lack of scientific information about PD in HVDC GIS, and the known defect identification techniques are very specific to the AC environment. New techniques are thus needed in DC.This thesis aimed to characterize partial discharges in DC gas-insulated substations, and to develop an automatic defect identification tool. The first step of this work was the development of a partial discharge measuring bench. The complete study has been performed in a GIS section, so that the results can be directly applied to industrial equipment. Two kinds of defect have been investigated: protrusions on the high-voltage conductor, and free metallic particles. The influence of parameters such as gas nature and pressure, voltage level and polarity has been evaluated. First, PD have been measured in conformity with the IEC 60270 standard, and the relevance of this method in a DC environment has been evaluated. Then, other measuring chains have been used to improve the characterization of partial discharges: a steady-state current measurement, a high-frequency current measurement, a light measurement and a measurement of Ultra-High Frequency (UHF) waves. Finally, a relevant signature for defect identification has been designed and extracted from DP recordings. A database has been constituted, and an automated recognition algorithm has been implemented.The results show that the conventional PD measurement technique is not fully adapted to partial discharges detection in DC, corona discharges being the most problematic situation. Nevertheless, this method has brought enough information to start the characterization of PD. The limitations of the conventional method have been explained thanks to the results of the other measurements. These other experimental results have led to an actual improvement of the characterization of protrusion and particle-generated partial discharges. An effective automated defect classification solution has been implemented. The signature is derived from the q(Δt) diagram that has been extracted from the data obtained with the partial discharge conventional measurement. The identification algorithm has a neural network structure
Havlíček, Tomáš. "Částečné výboje v elektronických zařízeních pracujících na vyšších kmitočtech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233500.
Full textDouar, Adnane. "Recherche de matériaux isolants pour la conception d'une nouvelle génération de connecteurs électriques haute tension : influence de la pollution sur les phénomènes de décharges partielles du contournement et de claquage." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0046/document.
Full textIn the present study, we deal with an essential problem related to electrical lines accessories and more particularly to piercing connectors (TTDC 45501FA) commercialized by a private company named Sicame and which is located in Arnac-Pompadour (Corrèze, France). This product/accessory is designed to provide power diversions on medium voltage live lines HVA operating between 15 and 25kV. However, it becomes required to design a new generation of piercing connectors able to operate on 52kV live lines because of the electrical power demands that are steadily increasing. Actually, the main concerns about these products are the occurrence of partial discharges within the insulating material volume (polyamide 6 containing 50%wt of glass fibers). Most of the time, these discharges induce an early ageing process of the accessory under the combined effects of a corrosive environment (as salt fog) and an electric field threshold. Thus, the main objective of the present Ph.D. thesis is to carry out an appropriate choice of insulating materials among several tested polymers such as thermoplastics and thermosetting epoxy resins and EPDM elastomers that are capable of withstanding several constraints: thermal and electrical and mechanical and chemical conditions. The experimental section is focusing on the measurements of flashover voltage and partial discharges activity propagating on polymeric surfaces and breakdown voltage within material bulks under A.C voltage. That is why polymeric samples with plane surfaces and textured surfaces are molded to compare their resistance to partial discharges when being subjected to polluted environments such as salt fog; these measurements are necessary to choose the suitable materials for the required application to be integrated in the new generation of connectors. Then, the optical and electrical characterization results of creeping discharges propagating on several polymeric surfaces under lightning impulse (L.I.) voltage with its both polarities (positive and negative) and for two kinds of applied electric field (normal and tangential) are presented in the case of solid/air interfaces. Final length measurements of creepage discharges are the main parameter for distinguishing material properties. The whole obtained results (under AC and LI voltages) allow us to point out the cycloaliphatic epoxy resins as potential candidates to the conception of a new generation of piercing connectors. In addition, the electric field simulation and modelling of the TTDC 45501FA connector by using the Flux 2D/3D software seems to be helpful to design a connector prototype which exhibits a new geometry and is able to reach a voltage level that equals 52kV
Lalitha, E. M. "Novel Applications Of Fractal Compression And Wavelet Analysis For Partial Discharge Pattern Classification." Thesis, 1999. http://etd.iisc.ernet.in/handle/2005/1613.
Full textMidya, Surajit. "Condition Monitoring Of Gas Insulated Substations Using UHF Detection Of Partial Discarges." Thesis, 2004. http://etd.iisc.ernet.in/handle/2005/1178.
Full textCebekhulu, Jabulani. "Critical review of commissioning/routine tests with special interest in undetected defects in SF6, GIS/GITL using UHF method." Thesis, 2009. http://hdl.handle.net/10539/7414.
Full textVaidya, Anil Pralhad. "A Model Study For The Application Of Wavelet And Neural Network For Identification And Localization Of Partial Discharges In Transformers." Thesis, 2004. http://etd.iisc.ernet.in/handle/2005/1183.
Full textVan, Jaarsveldt Johannes Hendrik. "Non-intrusive condition monitoring of power cables within the industrial sector / Johannes Hendrik van Jaarsveldt." Thesis, 2015. http://hdl.handle.net/10394/15701.
Full textMIng (Electrical and Electronic Engineering), North-West University, Potchefstroom Campus, 2015
Shetty, Pradeep Kumar. "Recognition And Retrieval Of Partial Discharges In Power Equipments : A Statistical Signal Modeling And Feature Extraction Approach." Thesis, 2004. http://etd.iisc.ernet.in/handle/2005/1182.
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