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Dissertations / Theses on the topic 'Oil Immersed Transformers'

Author: Grafiati

Published: 23 June 2021

Last updated: 29 July 2025

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1

Robalino, Vanegas Diego M. "Loss of life of medium voltage oil-immersed current transformers under thermal accelerated ageing a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=1934058311&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1264684717&clientId=28564.

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2

Mohamed, Ali Mohamed. "ANALYZING THE IMPACT OF PHOTOVOLTAIC AND BATTERIE SYSTEMS ON THE LIFE OF A DISTRIBUTION TRANSFORMER." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-54952.

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This degree project presents a study case in Eskilstuna-Sweden, regarding the effect of the photovoltaic (PV) systems with battery energy storage system (BESS) on a power distribution transformer, and how they could change the transformer lifespan. For that, an extensive literature review has been conducted, and two MATLAB models were used to simulate the system. One model simulates the PV generation profile, with the option of including battery in the system, and the other one simulates the transformer loss of life (LOL) based on the thermal characteristics. Simulations were using hourly time

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3

Marko, Robert Michael. "Thermal modelling of a natural-convection-cooled, oil-immersed distribution transformer." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq23407.pdf.

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4

Shu, Bor-Wen, and 許博聞. "Study of Temperature Rise on Oil-Immersed Power Transformers." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/32126061712116725621.

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碩士<br>中原大學<br>機械工程研究所<br>92<br>Abstract The flow field inside the tank of a transformer has a major impact on the performance of the transformer. As a result, it is essential for the design of the device to have an in-depth understanding of the flow field. Transformer is an effective electrical device for the connection of tow power systems and a major power source for the industry. In this study, the computational fluid dynamics (CFD) software Icepak, developed by the Fluent Company, was used to evaluate the thermal management of the various electronic devices. Icepak was based on the f

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Tsai, Ching-Chou, and 蔡青舟. "Partial Discharge Detection Technique for Oil-Immersed Transformers Diagnosis." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/16022588878998043260.

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碩士<br>崑山科技大學<br>電機工程研究所<br>103<br>With the electrical equipment insulation deterioration, during the breakdown period, the small-scale partial discharge will occur and leads to gradual decreasing of electricity insulation performance. With the increase of the applied voltage and duration, the frequency of occurrence of partial discharge intensity will increase, followed by arcing, result in outages of power system which is often the main cause of the failure. If the discharge phenomenon of intensity, position, patterns can be effectively monitoring, the loss of electrical equipment can be prev

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6

Wu, Sung-Chi, and 吳松錡. "Study of Partial Discharge on Oil-Immersed Power Transformers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/95312056279254448971.

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碩士<br>健行科技大學<br>電機工程系碩士班<br>104<br>Partial Discharge phenomenon is a superior factor to influence quality of transformer, improvement of partial discharge frequency and location will be major solution to increment transformer life time and quality. Transformer is a kind of power connection system which link different power level to each in industrial environment today. This research focus on Partial Discharge evaluation by new facility SPDA to observe phenomenon. We loaded relative data in mating software to simulate reality internal working situation then find electric discharge position

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7

Lin, Ying-Fu, and 林盈甫. "Study of Heat Dissipation on Oil-Immersed Power Transformers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/93710812640798548840.

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碩士<br>中原大學<br>機械工程研究所<br>98<br>The main purpose of this research is to study the thermal dissipation by natural convection of oil-immersed transformer with flow channels. The 167kVA oil-immersed power transformer is installed inside the utility box. The only way to cool it down. Therefore, the flow channel is very important for thermal dissipation of transformer. Hence, this study from the thermal dissipation in different flow channels in order to understand the temperature distribution in the transformer. This article uses CFDRC to simulate the velocity field as well as the temperature field

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8

Chiu, Chen-Yi, and 邱正義. "Design of Full Range Current Limit Fuse for Oil Immersed Distribution Transformers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/19380120564970797001.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>95<br>Electric power fuses have been used for protecting equipments in electric power system for over hundred years. Although other new protecting equipments have been provided with much more complex functions, power fuses are still very important equipments in electric power system. The simple construction, high reliability and fastest current cutout properties make it be used widely of the world. Traditional power fuses are sufficiently used for breaking high current, such as fault current, but insensitvely for low overload current (i.e. less than five times the ra

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9

Tsai, Cheng-Yu, and 蔡承佑. "Fault Diagnosis of Oil-Immersed Power Transformers by Using Back-Propagation Neural Networks." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/a35j63.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>106<br>The large power transformer is one of the most important and expensive equipment in the power system. The operating situation of transformer will directly affect the safety of the power system, and the fault of the transformer may cause the power interruption and the profit loss. Therefore, early detection of the initial fault of transformers, reduction and prevention of the fault can improve the reliability of power system.In this paper, we use the dissolved gas in transformer oil for fault diagnosis. The data of dissolved gas will provide an indirect basis

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10

HSU, CHIA-TAI, and 許嘉玳. "Applying Finite Element Analysis for Electromagnetic and Heat Thermal of Oil-immersed Pole Transformers." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/p7859h.

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碩士<br>國立臺北科技大學<br>電機工程系<br>107<br>This paper will be analyzed using the Finite Element Method to the pole 25 kVA oil-immersed transformer, and the type of sealed type have improved such as transformer, silicon steel and amorphous Alternatively other materials for the two types of cores are made, by COMSOL simulation analysis software Construction architecture Electromagnetic and Heat Thermal other transformer core and the outer electromagnetic intensity produced by the bucket analysis, and environmental impact study the changes in the hysteresis curve in the iron loss, while an analog loss to

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11

Chun-CheHsieh and 謝鈞哲. "A study on Artificial Neural Network Analysis based on Dissolved Gas in Oil-Immersed Distribution Transformers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/74407874579404078315.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>101<br>In this thesis, an oil-immersed distribution transformer dissolved gas analysis and diagnosis system are presented. The diagnosis adopts artificial neural network technique to evaluate the normality status of the oil-immersed type transformer. Three kinds of artificial neural network architectures, BPNN, RBFNN and PNN, were compared using 975 data, and then used trial and error method to find out the best model. After find out the best model using 20 data that is confirmed abnormal and 5892 historical data to observe and compare the ability of judgment alon

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12

Lin, Chien-Hung, and 林建宏. "Oil-Immersed Transformer Residual life Detector." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/x25393.

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碩士<br>中原大學<br>電機工程研究所<br>107<br>This study uses the temperature model algorithm and the equivalent aging factor algorithm to find the correlation between the load and temperature. The program is programmed in a single-chip microcomputer and combined with circuits to measure and analysis the operation of transformer. The detector is used to measure the load state and ambient temperature of the oil-immersed transformer, and then calculate the equivalent aging factor and residual life. Finally, the measured value and calculation result will show on the display. The actual value of the residual li

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13

Shyu, Jin-Huei, and 徐進輝. "Research of Preventive Diagnosis for Oil-immersed Transformer." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/79p4m5.

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碩士<br>國立虎尾科技大學<br>電機工程研究所<br>95<br>The power transformer is designed to change the voltage of power system, and have to face the burdens of long-term high voltage, large current, various temperatures and impact of electromagnetic stress. Once a breakdown happens, it always makes havoc and the outage will cause economic loss. Therefore, it is important to keep the power transformer running smoothly and longer. On the other hand, to predicate the breakdown events of the power transformer is another main subject. Dissolved gas analysis technique is the most popular and effective method for diagno

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14

Li, Ruei-Jhang, and 李瑞璋. "Life Assessment of Oil Immerged Power Transformer." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/69548780705928183693.

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碩士<br>臺北城市科技大學<br>資訊應用產業碩士專班<br>102<br>In general, the life expectancy of a power transformer is about 35 to 40 years. During operation of a power transformer, the various types of faults can be detected from gases in the insulating oil by using the dissolved gas analysis (DGA) diagnostic technology. The volume of these “fault gases” may effectively identify and represent the different conditions of transformer fault. Important information can be obtained after analysis of the integrated fault gases data. According to these data is helpful to draw out the life assessment curve of the transform

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15

Shun, Chun-Chi, and 單淳琪. "Estimation of oil-immersed power transformer insulation aging life." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/33pajt.

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碩士<br>國立臺北科技大學<br>電機工程系研究所<br>99<br>Oil-immersed power transformer needs to endure for an extended period of time high voltage, high current, temperature rise, and the impacts of electromagnetic and mechanical forces, and any malfunction may lead to large-scale power outages and other drastic losses. Oil-immersed power transformer is also highly expensive. It is therefore of crucial importance to keep the transformer in normal operation and to prolong its service life. Using effective maintenance mechanism and test-diagnostic techniques to measure the aging degree of a power transformer helps

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16

KUO, YING-TE, and 郭英德. "Design Technology for Oil-Immersed Amorphous Metal Core Distribution Transformer." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/90706562329317847185.

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碩士<br>中原大學<br>電機工程研究所<br>97<br>The transformers with amorphous metal core have characteristics of very low core loss and moderate decreasing the copper loss. Therefore, they are compatible with environmental protection and energy conservation. They are widely used in the power systems. The design of amorphous metal core transformers can be divided into two major parts, namely electrical design and structure design. The electrical design, according to the specifications requested by the customers, is to calculate the core size, the conductor size and turn number of windings, and the required e

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17

Yeh, Yuan-Chang, and 葉元彰. "Application of Fuzzy Theory to Oil-Immersed Power Transformer Fault Diagnosis." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/61711383343252925764.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>98<br>Power transformer is an important equipment in power system. If a breakdown happens, it will cause huge economy loss. Therefore, it is important to keep the power transformer running smoothly. On the other hand, to predict the breakdown events of the power transformer is another main subject. Dissolved gas analysis technique is the most popular and effective method for diagnosing the potential defects existing in oil-immersed power transformers. This technique can keep the power system at high reliability. The technique of dissolved gas analysis is adopted to

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18

Hsieh, Hung-Wei, and 謝宏偉. "Fault Diagnosis of Oil-immersed Power Transformer Using Dissolved Gas Analysis." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/97404191408426757042.

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碩士<br>正修科技大學<br>電機工程研究所<br>101<br>Power transformers play an important role in power system operation. Their failure may lead to power supply interruption, or even cause a fire and a series of industrial safety accident, thus causing significant loss of social and economic development. Therefore, enhancement of the maintenance and predictive maintenance of the power transformers become a necessary trend to ensure that the power system can be securely, stablely, and efficiently operated. Dissolved gas analysis is one of the vital and efficient diagnosis techniques for fault diagnosis of oil-imm

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19

Wang, Fu-Chun, and 王福春. "The Study of Dissolved Gas Analysis and Oil Activation Recycling Treatment in the Oil-immersed Transformer." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/756873.

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碩士<br>崑山科技大學<br>電機工程研究所<br>97<br>According to the more and more high expectations of the power supply dependability followed by economic development and livelihood, makes the electricity to be more and more important from power plants to substations, and then from transformers to the customers of industry, commerce and family. The oil-immersed transformer can be regard as the heart of the power supply system. It has very important meanings for energy transmission, flexible distribution and safe manipulation. If it is out of order, it will create a serious effect. However, transformer insulatin

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20

FU, YANG YUNG, and 楊永福. "The internal temperature of the test for the oil-immersed transformer intelligent fibers." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/07919153454831200082.

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碩士<br>逢甲大學<br>資訊電機工程碩士在職專班<br>103<br>The purpose of this study semiconductor optic fiber temperature sensors for smart amount of oil-immersed transformer internal temperature measured in order to facilitate their maintenance and prolong the life of substation equipment, and asset management. The study found poorly installed transformer manufacturing process or lead to reduced life of the transformer and a major accident, causing the client no case of electricity available. When the transformer previously detected abnormal temperature rises, the engineer early response measures to reduce outage

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21

Liao, Wei-Chen, and 廖偉辰. "The Research and Development of Oil Immersed Transformer by Using Pulsating Heat Pipes (PHP)." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/572249.

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22

Chun-Fu, Chang, and 張春富. "Development of a Sound Source Location and Identification Technique for Oil Immerged Power Transformers." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/09756315345316253531.

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碩士<br>國立臺灣大學<br>工程科學與海洋工程學系<br>92<br>In consideration of the imperious requirement in promoting efficiency and in-serve detection on load tap changers (OLTC) in large scale oil-immerged power transformers, an acoustic based on-line detection, failure source location and patterns recognition technique is developed in this article. To determine the wave mode change, velocity and propagating path of acoustic wave which propagate from the source to the outer wall of transformers and the Lamb wave is dispersive phenomena have to confirm before, to take for source location technique a ba

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23

Pan, Wen-Hua, and 潘文華. "Development of Partial Discharge Source Recognition and Identification Scheme for Oil Immerged Power Transformers." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/71866036236742649858.

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碩士<br>國立臺灣大學<br>造船及海洋工程學研究所<br>89<br>In consideration of the requirement of recognition of the partial discharge (PD) phenomena in large scale oil-immerged power transformers, a waveform inversion procedure based on elastic wave theory and digital signal processing is developed in this study. To diminish the influence of dispersion relation on waveform and to provide useful information for classifying PD in power transformers, leaky lamb wave theory was introduced. It was used to find out the wave propagation and velocity of different mode and different frequency, then the attenuation and time

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24

Kao, Hao-Chiang, and 高豪強. "Study of On-line Dissolved Gas Monitoring System for Oil-Immerged Power Transformer." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98380027750364626038.

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碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>101<br>In power companies and industries, oil-immerged power transformers are adopted to all large capacity transformers. Consequently, oil-immerged power transformer plays an extremely important role, also the key equipment in power system. Power transformer failure could result to power supply interruptions that lead to equipment impact and damages, in worse cases, fire hazard. To monitor transformers operation, build up an early stage alarm system that allow measures taken when dysfunctions occur, and to bring power transformer back to normal operations are

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25

Tsai, Wei-hsin, and 蔡偉炘. "The Application of Diagnosis Techniques of the in-Service Transformer and the Gases Analysis of the Insulated Oil to Prevent Oil-Immersed Power Transformer Failures." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/f2rbcp.

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碩士<br>國立高雄大學<br>電機工程學系碩士班<br>102<br>The oil-immersed power transformers are utilized to voltage transform and power dispatch in electric power systems. The power supply would interrupt while failures occurred in power transformers, and also caused the economic lost. The priority issue is to maintain the transformers operating safely and prevent the causing of the accident. This thesis integrated some diagnosis techniques and the gases analysis of the insulated oil. To detect and identity the possible types of fault and its location prior to breaking down.

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26

張育華. "Test Analysis of Oil Immerged Transformers Insulation Based on Fabrication Design of Pressure Relief Valve." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/44783072614459290089.

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碩士<br>國立彰化師範大學<br>機電工程學系<br>94<br>The insulated oil makes transformer deform based on the result of high temperature and power loading effects. At present, pressure relief valve (PRV) is one of the key solutions used to release the rising pressure inside the transformer. But, conventional PRV design is not only efficient at installation time but also in time consumption. The main purpose of this thesis is to decrease the time for PRV installation and power shutdown. The PRV is used to locate on the cover of transformer which causes moisturized easily. Aiming to overcome this shortcoming, this

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27

Chang, C. T., and 張哲騰. "Fault Diagnosis of Oil-Immersed Power Transformer by Using Fuzzy Set and Artifical Neural Network Theories." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/80268197972265190688.

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碩士<br>國立中正大學<br>電機工程研究所<br>90<br>Dissolved gas analysis technique is the most popular and effective method for diagnosing the potential faults existing in oil type transformer. The technique of monitoring and sampling the dissolved gasses provides a higher reliability. Some advanced industrial countries adopt the technique of dissolved gas analysis to maintain the function of the transformer because it does not interrupt the power supply. However, the accuracy of dissolved gas analysis not high. So developing a available diagnosis technique for local oil type transformer propriety models is es

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28

Chen, Kuan-Ju, and 陳冠儒. "An Intelligence Maintenance Recommendation Platform Based on Real-time Monitoring Information for Oil-immersed Transformer Case Study." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/8783g3.

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碩士<br>國立臺北科技大學<br>工業工程與管理研究所<br>99<br>In the power supply system, the transformer has been one of the most important components. If the transformer faults during the power supply, the economy and stability of the power supply will suffer huge impact and influence. Therefore, the transformer has become a critical factor for business operations in the power system asset management. It focuses on the real-time diagnosis and preventive maintenance to avoid unexpected accidents. In addition, the deterioration of insulating paper can be used to determine the degree of transformer depletion. Serious

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