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Journal articles on the topic 'Oil distribution transformer'

Author: Grafiati

Published: 28 June 2021

Last updated: 18 February 2022

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1

Kattel, Ruska, and Bhupendra Devkota. "PCBs Contamination among Distribution Transformers in the Kathmandu Valley." International Journal of Environment 4, no. 1 (2015): 16–29. http://dx.doi.org/10.3126/ije.v4i1.12175.

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Transformer is the crucial part in any electrical system, however there are many risks associated with its use. Thus this study was focused on assessing the status of PCBs contamination and distribution of transformers in Distribution Centre-North of the Kathmandu valley along with PCBs contamination in them. Each transformer within the study area was closely observed to obtain information about all transformers. The dielectric oil samples from the transformers were collected, safely stored and analyzed in Test Kits (L2000DX Chloride Analyzer System, recommended by UNEP). Among 111 samples of

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2

Okundamiya, M. S., E. Esekhaigbe, J. L. Owa, and H. I. Obakhena. "Impacts of Ambient Temperature Change on the Breakdown Voltage of a Distribution Transformer." International Journal of Emerging Scientific Research 2 (June 27, 2021): 19–25. http://dx.doi.org/10.37121/ijesr.vol2.155.

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The aim of this paper is to determine the effects of ambient temperature variation on the breakdown voltage of a distribution transformer. Three different insulation oil samples (naphtha mineral, paraffin mineral and silicon base transformer oil) were collected from six distribution transformers (300 – 500 kVA) across two business units (Asaba and Ugbowo) of Benin Electricity Distribution Company during May and June, 2017. The oil samples were analysed using the 60 kV Megger OST60PB portable oil tester, to determine the trend of breakdown voltage of the oil insulation under varying temperature

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3

Lu, Yun Cai, Li Wei, Wei Chao, and Wu Peng. "The New Development Trend of Distribution Transformer." Applied Mechanics and Materials 672-674 (October 2014): 831–36. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.831.

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Firstly, this paper introduces the development of new materials, new technology and new manufacture in power industry of China, energy-saving, low noise and smart distribution transformers are widely used in countryside power grid reconstruction. In this paper, application status and development trend of different types of distribution transformers were introduced and compared in terms of new material and new structure, such as oil-immersed distribution transformer, amorphous core transformer(AMT), dry-type transformer, SF6 insulated distribution transformer, composite transformer and other ty

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4

Gafvert, U., A. Jaksts, C. Tornkvist, and L. Walfridsson. "Electrical field distribution in transformer oil." IEEE Transactions on Electrical Insulation 27, no. 3 (1992): 647–60. http://dx.doi.org/10.1109/14.142730.

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5

Yuchao, Ma, Mo Juan, Yu Jinshan, Li Xiang, and Zheng Zhongyuan. "Study on Sound Field Distribution Rule for Tank Structures of Large Oil-immersed Transformers." E3S Web of Conferences 233 (2021): 01021. http://dx.doi.org/10.1051/e3sconf/202123301021.

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Large oil-immersed transformers are an important part of the transmission and distribution network in power systems. Power transformers are the main noise source of substations. Because of the uneven manufacturing process, aging equipment, long-term operation, and close distance from sensitive points, the problem of transformer noise pollution has become increasingly prominent. In this paper, the transmission and analysis model is established for transformer sound waves on the interface between insulating oil and tank body according to the sound wave propagation rule in complicated medium, and

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6

Roza, Indra, Yussa Ananda, Lisa Adriana Siregar, Dharmawati Dharmawati, and Junaidi Junaidi. "Analysis of Age Transformer Due to Annual Load Growth in 20 kV Distribution Network." Journal of Renewable Energy, Electrical, and Computer Engineering 1, no. 1 (2021): 42. http://dx.doi.org/10.29103/jreece.v1i1.3685.

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Distribution transformer is a component in distributing electricity from distribution substations to consumers. Damage to distribution transformers causes continuity of customer service to be disrupted (power cut or blackout occurs). The length of the PLN electricity network requires a transformer to distribute electricity to serve consumers and how to maintain the transformer. The daily load curve of a peak load for housing, shops and factories / industries varies. Load served 200 kVA distribution transformer cannot serve the load on housing, shops and factories / industry. The method used is

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7

Melnikova, O. S., and V. S. Kuznetsov. "Method of calculating the electric strength of oil channels of the main insulation of power transformers." Vestnik IGEU, no. 5 (December 30, 2020): 48–55. http://dx.doi.org/10.17588/2072-2672.2020.5.048-055.

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The most damage-sensitive unit of power transformers is the main insulation of the oil barrier type. The breakdown of such insulation occurs as a result of the breakdown of the oil channel near the high voltage winding. In accordance with traditional methods of calculating the dielectric strength of insulation, the value of the breakdown strength is determined by empirical formulas depending on the selected width of the oil channel. The existing methods do not consider the influence of the oil channel volume, of the electric strength the statistical characteristics of the oil, the design featu

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8

Melnikova, O. S. "Impact of distribution of impurity particles on electric strength of transformer oil." Vestnik IGEU, no. 6 (2019): 41–49. http://dx.doi.org/10.17588/2072-2672.2019.6.041-049.

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To extend the service life and ensure the operability of oil-filled transformer equipment, the attention is paid to the development of methods for monitoring the state of oil-barrier insulation. When monitoring the technical condition of transformer oil, the class of liquid purity is determined depending on the rated voltage of the equipment. However, the influence of the parameters of mechanical impurities on the breakdown voltage is not taken into account, thereby lowering the requirements for the quality of oil barrier insulation. This makes it relevant to study the influence of the size di

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9

Korenciak, D., M. Sebok, and M. Gutten. "Thermal Measurement and its Application for Diagnostics of Distribution Oil Transformers." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 62, no. 6 (2019): 583–94. http://dx.doi.org/10.21122/1029-7448-2019-62-6-583-594.

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In the first part of the paper the theory of infrared radiation and the use of nondestructive measurement of electrical devices by means of thermovision are under analysis. In the second part of paper basic principles and application of non-contact temperature measurement are examined. In the third part of paper thermal processes in distribution oil transformer – temperature in dependence on height of oil transformer and temperature distribution in sectional plan of oil transformer – are considered. In the fourth part of paper, by means of the experimental measurements and subsequent analysis,

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10

Amrita, A. A. N., W. G. Ariastina, and I. B. G. Manuaba. "Study of Transformer Lifetime Due to Loading Process on 20 KV Distribution Line." Journal of Electrical, Electronics and Informatics 2, no. 2 (2018): 25. http://dx.doi.org/10.24843/jeei.2018.v02.i02.p01.

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Power transformer is very important in electric power system due to its function to raise or lower the voltage according to its designation. On the power side, the power transformer serves to raise voltage to be transmitted to the transmission line. On the transmission side, the power transformer serves to distribute the voltage between the main substations or down to the distribution voltage. On the distribution side, the stresses are channeled to large customers or lowered to serve small and medium customers. As the power transformer is so importance, it is necessary to protect against distu

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11

Bustamante, Sergio, Mario Manana, Alberto Arroyo, Alberto Laso, and Raquel Martinez. "Determination of Transformer Oil Contamination from the OLTC Gases in the Power Transformers of a Distribution System Operator." Applied Sciences 10, no. 24 (2020): 8897. http://dx.doi.org/10.3390/app10248897.

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Power transformers are considered to be the most important assets in power substations. Thus, their maintenance is important to ensure the reliability of the power transmission and distribution system. One of the most commonly used methods for managing the maintenance and establishing the health status of power transformers is dissolved gas analysis (DGA). The presence of acetylene in the DGA results may indicate arcing or high-temperature thermal faults in the transformer. In old transformers with an on-load tap-changer (OLTC), oil or gases can be filtered from the OLTC compartment to the tra

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12

Djurdjevic, Ksenija, Mirjana Vojinovic-Miloradov, and Slobodan Sokolovic. "Life cycle of transformer oil." Chemical Industry 62, no. 1 (2008): 37–46. http://dx.doi.org/10.2298/hemind0801037d.

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The consumption of electric power is constantly increasing due to industrialization and population growth. This results in much more severe operating conditions of transformers, the most important electrical devices that make integral parts of power transmission and distribution systems. The designed operating life of the majority of worldwide transformers has already expired, which puts the increase of transformer reliability and operating life extension in the spotlight. Transformer oil plays a very important role in transformer operation, since it provides insulation and cooling, helps exti

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13

Stanisic, Stevan, Milica Jevtic, Bhaba Das, and Zoran Radakovic. "Fem CFD analysis of air flow in kiosk substation with the oil immersed distribution transformer." Facta universitatis - series: Electronics and Energetics 31, no. 3 (2018): 411–23. http://dx.doi.org/10.2298/fuee1803411s.

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In practice of loading of oil-immersed distribution transformers, there is a need to have lumped thermal model, requiring no big computational resources and computational time. One such model is presented in international transformer loading guide (IEC 60076-7), where heat transfer inside the transformer is modeled. In case of indoor transformer operation, this model does not consider transient thermal phenomena in the room. We developed a lumped model that includes heat transfer in the transformer room. In scope of the research, we also built FEM CFD (finite element method, computational flui

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14

Liu, Wei Jia, Xin Wang, Yi Hui Zheng, Li Xue Li, and Qing Shan Xu. "The Assessment of the Overload Capacity of Transformer Based on the Temperature Reverse Extrapolation Method." Advanced Materials Research 860-863 (December 2013): 2153–56. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.2153.

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The assessment of the overload capacity of transformer has a certain practical significance. In this paper, a temperature reverse extrapolation method is proposed to assess the overload capacity of transformer. Firstly, the top oil temperature is monitored by the online monitoring system. Secondly, the temperature distribution model and the calculation methods of hot spot temperature in the PTP7 (Power Transformers. Part 7: Loading guide for oil-immersed power transformers) guide are analyzed. Then, a new method called temperature reverse extrapolation which can calculate the overload factor o

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15

Muhamad, Nor Asiah, and Hanafiah Kamarden. "Simulation Study on HST Distribution for ONAN Oil-Filled Transformer." Applied Mechanics and Materials 785 (August 2015): 269–73. http://dx.doi.org/10.4028/www.scientific.net/amm.785.269.

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Advanced monitoring system and preventive maintenance introduced on serviced transformer successfully reducing the equipment malfunction and breakdown rate. However, faults that occur and developed inside the transformer can be very unpredictable. One of the measures can be taken is to analyse the hottest spot temperature (HST) of the transformer, because high temperature will affect transformer insulation system performance and its life-span. HST distribution study on the transformer surface body can give better understanding on how HST will behave at inner and outer transformer surface tank,

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16

K.C., Laxman, and Bhupendra Devkota. "PCBs Contaminantion of Transformer Oil and its Occupational Health and Safety Status in the Kathmandu Valley, Nepal." International Journal of Environment 3, no. 4 (2014): 12–23. http://dx.doi.org/10.3126/ije.v3i4.11727.

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Electrification in Kathmandu valley had started in 1911 and the use of polychlorinated biphenyls (PCBs) probably started since 1940s (Devkota, 2005). This research work was undertaken to find out the degree and extent of PCBs contamination in transformer oil and to explore its impacts on occupational health and safety issues of the workers and on the environment. The research was focused on Distributions Centers of the Nepal Electricity Authority (NEA) in the Kathmandu valley, NEA Lainchaur workshop and welding workshops of the Kathmandu valley. The samples of transformer oil were collected, s

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17

Wan, Tao. "The Temperature Distribution of Oil-Immersed Transformer Starting with Heavy Load in Cold Regions." Advanced Materials Research 1079-1080 (December 2014): 553–57. http://dx.doi.org/10.4028/www.scientific.net/amr.1079-1080.553.

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When the large oil-immersed transformer start with heavy load in cold regions, due to the high viscosity of the oil at low temperatures, the flow of the oil is extremely slow in the early start of heavy load, resulting in a negative heat radiation. At the same time, the winding and the core are rapidly increasing heat in the early start of heavy load. Rapid increase in heat and the lack of heat dissipation caused a series of problems. In this paper, we study the process of heating and cooling when the large oil-immersed transformer start with heavy load in cold region and takes a transformer o

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18

Husin, M. A., Nordiana Azlin binti Othman, N. A. Muhammad, H. Kamarden, and M. S. Kamarudin. "Top oil heat distribution pattern of ONAN corn oil based transformer with presence of hot spot study using FEMM." Bulletin of Electrical Engineering and Informatics 8, no. 3 (2019): 753–60. http://dx.doi.org/10.11591/eei.v8i3.1602.

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Transformer thermal modelling is a crucial aspect to be considered as this may help the determination of heat capacity of transformer. This paper present, simulation study on Oil Natural Air Natural (ONAN) transformer heat distribution pattern with and without presence of hot spot temperature (HST). This paper aims to compare the effects of different HST value at different locations inside the transformer unit as well as to evaluate the top oil thermal behaviour of corn oil as cooling mechanism in a transformer. To achieve aforementioned objectives, three HSTs were introduced to the 30 MVA tra

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19

Sun, Ruibang, Xing Yang, Juncai Wang, Peng Chen, and Liusuo Wu. "Experimental Study on Axial Temperature Profile of Jet Fire of Oil-Filled Equipment in Substation." Processes 9, no. 8 (2021): 1460. http://dx.doi.org/10.3390/pr9081460.

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With the widespread use of substations around the world, oil jet fire accidents from transformer oil-filled equipment in substations caused by faults have occurred from time to time. In this paper, a series of transformer oil jet fire experiments are carried out by changing the external heat source (30 cm and 40 cm) and the inner diameter of the container (5 cm, 8 cm and 10 cm) to study the axial centerline temperature distribution of the transformer oil jet fire plume of the transformer oil-filled equipment in the substation. The experiment uses K-type thermocouple, electronic balance and CCD

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20

Hasan, Mushtaq I., Adnan A. Ugla, and Hassan S. Kadhim. "Improving the thermal performance of electrical transformers using hybrid mixture of (transformer oil, nanoparticles, and PCM)." Al-Qadisiyah Journal for Engineering Sciences 13, no. 3 (2020): 175–82. http://dx.doi.org/10.30772/qjes.v13i3.704.

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In this paper, an experimental electrical distribution transformer was studied and a new technique was proposed to improve the performance of a new mixed cooling consisting of pure transformer oil, paraffin wax and nanoparticles. The experiment was carried out on a small transformer that was done by taking a model with dimensions (15 * 10 * 10) cm to facilitate calculations. Paraffin wax absorbs the heat generated in the transformer due to the smelting process that can be used to cool electrical appliances. Nanoparticles have good thermal properties and lead to increased oil insulation to ther

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21

Das, Anu Kumar, Aniket Shivaji Chavan, Dayal Ch Shill, and Saibal Chatterjee. "Jatropha Curcas oil for distribution transformer – A comparative review." Sustainable Energy Technologies and Assessments 46 (August 2021): 101259. http://dx.doi.org/10.1016/j.seta.2021.101259.

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22

Yahaya, Muhammad, Norhafiz Azis, Amran Mohd Selva, et al. "A Maintenance Cost Study of Transformers Based on Markov Model Utilizing Frequency of Transition Approach." Energies 11, no. 8 (2018): 2006. http://dx.doi.org/10.3390/en11082006.

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In this paper, a maintenance cost study of transformers based on the Markov Model (MM) utilizing the Health Index (HI) is presented. In total, 120 distribution transformers of oil type (33/11 kV and 30 MVA) are examined. The HI is computed based on condition assessment data. Based on the HI, the transformers are arranged according to its corresponding states, and the transition probabilities are determined based on frequency of a transition approach utilizing the transformer transition states for the year 2013/2014 and 2012/2013. The future states of transformers are determined based on the MM

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Hasan, Mushtaq Ismael. "Improving the cooling performance of electrical distribution transformer using transformer oil – Based MEPCM suspension." Engineering Science and Technology, an International Journal 20, no. 2 (2017): 502–10. http://dx.doi.org/10.1016/j.jestch.2016.12.003.

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Ab Ghani, Siti Soleha, and Nor Asiah Muhamad. "Review on Dissolved Fault Gases in Monitoring Bio-Oil Filled Transformer." Applied Mechanics and Materials 818 (January 2016): 69–73. http://dx.doi.org/10.4028/www.scientific.net/amm.818.69.

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The combination of solid insulation (usually cellulose paper) and liquid insulation (usually mineral oil) yield good dielectric properties at fair cost. However, arising concerns on environmental effect of mineral oil when leakage and its risk of fire has force researches for alternative fluids. One of the suitable options for replacement of mineral oil is biodegradable oil that is plant-based, high biodegradability, non-toxicity and high fire point. Some refining and modification to crude vegetable oils resulting to suitable transformer dielectric fluid such as BIOTEMP®, ENVIROTEMP® FR3 and P

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Meitei, Sorokhaibam Nilakanta, Kunal Borah, and Saibal Chatterjee. "Modelling of Acoustic Wave Propagation Due to Partial Discharge and Its Detection and Localization in an Oil-Filled Distribution Transformer." Frequenz 74, no. 1-2 (2020): 73–81. http://dx.doi.org/10.1515/freq-2019-0050.

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AbstractPartial discharge (PD) is the main cause of the insulation decay and hence periodical testing of the insulation condition of a distribution transformer is necessary. This paper presents a model of PD acoustic wave propagation, detection, and localization in an oil-filled distribution transformer using finite element method supported by COMSOL Multiphysics software. Using an acoustic module and AC/DC module of COMSOL Multiphysics software, oil filled distribution transformer, and the acoustic piezoelectric sensor are simulated to analyze and detect the PD inside the transformer. PD is n

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Yue, Guo Liang, Yong Qiang Wang, Jie He, and Hong Liang Liu. "Research of Temperature Field in Oil-Immersed Transformer Considering the Oil Speed." Advanced Materials Research 912-914 (April 2014): 1041–45. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1041.

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In this paper, we have Elaborated the mathematical model of temperature field and flow field of the oil-immersed transformer, and analysis its structure of thermal .We established a temperature finite element model of an oil-immersed transformer using the method of flow-solid-thermal coupling. Using the software of ANSYS, simulating on a 250MVA oil-immersed transformer, we obtain the steady-state temperature distribution and the winding hottest locations. Analyze the effect of oil-speed to the temperature field and location of the hot spot temperature of oil-immersed transformer. The results s

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Liu, Qiang, Ramamoorthi Venkatasubramanian, Shanika Matharage, and Zhongdong Wang. "Effect of Oil Regeneration on Improving Paper Conditions in a Distribution Transformer." Energies 12, no. 9 (2019): 1665. http://dx.doi.org/10.3390/en12091665.

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Managing a large fleet of ageing assets has become a technical challenge faced by many electricity utilities in developed countries. Asset managers are increasingly interested in techniques that can help extend the useful lifetime of a transformer. Oil regeneration is one of such techniques. In this paper, oil regeneration experiments were performed on a 6.4/0.4 kV retired distribution transformer to investigate the effect of oil regeneration on improving paper conditions. Oil regeneration was conducted in two stages, with the first stage aimed at ‘cleaning the oil’ and the second stage target

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Wang, Yong Qiang, Jie He, Lun Ma, et al. "Research of the Temperature Field Distribution Based on FVM for Oil-Immersed Transformer." Advanced Materials Research 1079-1080 (December 2014): 510–14. http://dx.doi.org/10.4028/www.scientific.net/amr.1079-1080.510.

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Thehottest spot temperature (HST) of windings of oil-immersed transformer is animportant factor that affects load capacity and operation life of transformer,and is closely related to the transformer load, top oil and environmenttemperature. HST, when operating at high temperature and overload, may lead totransformer failure which will affect the normal operation of the power system.In order to calculate the transformer hot spot temperature accurately, we takea 33MVA-500KV transformer as an example, and establish a three dimensionalmodel, get its internal temperature distribution based on Fluen

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KROPOTIN, V. O., S. S. GIRSHIN, V. N. GORYUNOV, E. V. PETROVA, V. M. TROTSENKO, and A. O. SHEPELEV. "SIMULATION OF STATIONARY THERMAL REGIME OF OIL TRANSFORMER USING ANSYS." Actual Issues Of Energy 3, no. 1 (2021): 037–42. http://dx.doi.org/10.25206/2686-6935-2021-3-1-37-42.

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With the expansion of the electric power system, the number of distribution plants increases, the most common in which are oil-immersed transformers. the increase in the number of transformers leads to an increase in energy losses, which depend on many factors, including the temperature of the windings. at the same time, temperature is one of the most important parameters that determine the service life of a transformer. the paper discusses a digital model of the thermal regime of an oil-immersed transformer with natural cooling based on the ansys software, focused both on the tasks of calcula

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Adejumobi, I. A. "Dielectric Strength, Breakdown Voltage and Acidity Test with Respect to Transformer Insulating Oil." Advanced Materials Research 62-64 (February 2009): 120–25. http://dx.doi.org/10.4028/www.scientific.net/amr.62-64.120.

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This paper presented the qualitative assessment of transformer insulating oil. The breakdown voltage, dielectric and acidity tests were electrically and chemically carried out on sixteen samples of transformer insulating oil collected from various serving distribution transformers in Ilorin Metropolis in Nigeria, through the supply authority. The adequacy of the obtained results was determined by comparing experimental values with America Society for Testing and British Standard (BTA4705) pre-requisites. About seventy five percent (75%) of the tested samples failed at least one of the tests, i

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Orjiewulu, J. C., D. C. Chukwuemeka, C. E. Jesusblessing, and A. Ibrahim. "DESIGN AND IMPLEMENTATION OF AN AUTO-TEMP CONTROL SYSTEM FOR DISTRIBUTION TRANSFORMER." Open Journal of Engineering Science (ISSN: 2734-2115) 1, no. 2 (2020): 1–19. http://dx.doi.org/10.52417/ojes.v1i2.142.

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Unreliability and interruptions facing power supply are evidence of the excessive heat generated in power systems, as a result of the inefficiency of oil cooling medium employed in distribution transformers. The design and implementation of a prototype automatic temperature control system is to be employed as a method towards solving the above stated problem of excessive temperature rise in distribution transformers. The prototype design consists of a PIC microcontroller programmed in C language, an LM35 temperature sensor, an electric fan and other diverse electronic component. It operates a

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Tien, Nguen, and K. H. Gilfanov. "Thermal modelling of oil-filled power transformer TM - 160/10." Power engineering: research, equipment, technology 21, no. 5 (2019): 141–51. http://dx.doi.org/10.30724/1998-9903-2019-21-5-141-151.

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The results of modeling the thermal characteristics of the dry and oil-filled power transformer TM-160/10 in idle and short circuit modes are presented. The electrical, geometric and thermal characteristics of the TM-160/10 transformer are determined. Computer modeling is performed in the software package ANSYS 17.1. The 2D distributions of temperature and density of heat flows in the transformer in the longitudinal and transverse sections are determined. It is shown that the use of transformer oil for cooling the transformer significantly reduces the temperatures in the active part. The tempe

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Sutan Chairul, Imran, Yasmin Hanum Md Thayoob, Young Zaidey Yang Ghazali, Mohd Shahril Ahmad Khiar, and Sharin Ab Ghani. "Formation and Effect of Moisture Contents to Kraft Paper’s Life of In-Service Power Distribution Transformer." Applied Mechanics and Materials 793 (September 2015): 114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.793.114.

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Examples of solid and liquid electrical insulations for power transformer are mineral oil and cellulose based paper. As transformers performed their function to step-up or step-down voltage level, its’ insulations will be degraded. Paper insulation is considered the most critical component in a transformer insulation system because it is not easily replaced if compared to oil where it is easily reconditioned in-order to remove water and contaminants. Studies show that temperature, moisture contents and oxygen contributed to paper insulation degradation. Moisture and furanic compound were produ

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Saker, A., and P. Atten. "Potential distribution along single negative creeping streamer in transformer oil." IEE Proceedings A Science, Measurement and Technology 140, no. 5 (1993): 375. http://dx.doi.org/10.1049/ip-a-3.1993.0058.

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Li, Guang Hua, Hong Lei Liu, and De Jian Wang. "Heat Transfer Model and Analysis of Oil-Immersed Electrical Transformers with Heat Pipe Radiator." Advanced Materials Research 516-517 (May 2012): 312–15. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.312.

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This paper has formulated a heat transfer model for analyzing the cooling properties of a heat pipe cooling device of oil-immersed electrical transformer. Based on the model, the oil temperature field of a 30 KVA oil-immersed transformer has been numerical simulated, and experiments also had been conducted. Results showed that the numerical simulation has good agreement with experiment results. Results also showed that heat pipe radiator is feasible for oil-immersed electrical transformer cooling. The model can be used to analyze the oil temperature distribution properties in an oil-immersed e

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Ivankov, V. F., А. V. Basova, and І. V. Khimjk. "ANALYTICAL AND CFD-CALCULATION OF THE HEAT CONDITION OF FOIL WINDINGS OF OIL DISTRIBUTING TRANSFORMERS." Tekhnichna Elektrodynamika 2020, no. 6 (2020): 77–86. http://dx.doi.org/10.15407/techned2020.06.077.

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An analytical method of calculating the thermal condition of foil windings of lower voltage oil distribution transformers has been developed. At known oil temperatures in the tank, this technique provides the identification of heat-recoil ratios on winding surfaces, taking into account their design features and heat loads, as well as calculating the excess esexcesses of the average temperature of the winding and its most heated point above the oil and over the cooling environment. In order to calculate the excess temperature of the winding over the oil by the method of separating variables usi

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SRINIVASAN, M., and A. KRISHNAN. "ASSESSING THE RELIABILITY OF TRANSFORMER TOP OIL TEMPERATURE MODEL." International Journal of Reliability, Quality and Safety Engineering 19, no. 05 (2012): 1250024. http://dx.doi.org/10.1142/s0218539312500246.

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The hot spot temperature (HST) plays a most important role in the insulation life of the transformer. Ambient temperature and environmental variable factors involved in the top oil temperature (TOT) computations in all transformer thermal models affects insulation lifetime either directly or indirectly. The importance of the ambient temperature in transformer's insulation life, a new semi-physically-based model for the estimation of TOT in transformers has been proposed in this paper. The winding hot-spot temperature can be calculated as function of the TOT that can be estimated by using the a

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Alqudsi, Alhaytham, and Ayman El-Hag. "Application of Machine Learning in Transformer Health Index Prediction." Energies 12, no. 14 (2019): 2694. http://dx.doi.org/10.3390/en12142694.

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The presented paper aims to establish a strong basis for utilizing machine learning (ML) towards the prediction of the overall insulation health condition of medium voltage distribution transformers based on their oil test results. To validate the presented approach, the ML algorithms were tested on two databases of more than 1000 medium voltage transformer oil samples of ratings in the order of tens of MVA. The oil test results were acquired from in-service transformers (during oil sampling time) of two different utility companies in the gulf region. The illustrated procedure aimed to mimic a

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Guney, Ezgi, and Okan Ozgonenel. "An Eco-Friendly Gas Insulated Transformer Design." Energies 14, no. 12 (2021): 3698. http://dx.doi.org/10.3390/en14123698.

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Electricity companies around the world are constantly seeking ways to provide electricity more safely and efficiently while reducing the negative impact on the environment. Mineral oils have been the most popular transformer insulation, having excellent electrical insulating properties, but have many problems such as high flammability, significant cleaning problems, and are toxic to fish and wildlife. This paper presents an alternative approach to mineral oil: a transformer design that is clean and provides better performance and environmental benefits. A 50 kVA, 34.5/0.4 kV gas insulated dist

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Yahaya, Muhammad, Norhafiz Azis, Amran Mohd Selva, et al. "Effect of Pre-Determined Maintenance Repair Rates on the Health Index State Distribution and Performance Condition Curve Based on the Markov Prediction Model for Sustainable Transformers Asset Management Strategies." Sustainability 10, no. 10 (2018): 3399. http://dx.doi.org/10.3390/su10103399.

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This paper presents an investigation of the condition state distribution and performance condition curve of the transformer population under different pre-determined maintenance repair rates based on the Markov Prediction Model (MPM). In total, 3195 oil samples from 373 transformers with an age between one and 25 years were tested. The previously computed Health Index (HI) prediction model of the transformer population based on MPM utilizing the nonlinear minimization technique was employed in this study. The transition probabilities for each of the states were updated based on 10%, 20% and 30

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Shutenko, O. V., and S. H. Ponomarenko. "CORRECTION OF TRANSFORMER OIL BREAKDOWN VOLTAGE MAXIMUM PERMISSIBLE VALUES BY THE MINIMUM RISK METHOD." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 1 (1) (December 30, 2020): 105–14. http://dx.doi.org/10.20998/2224-0349.2020.01.16.

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The method of correction of maximum permissible values of breakdown voltage of transformer oils in order to minimize possible economic damage in case of making erroneous decisions during diagnostics of the condition of transformer oils according to the results of periodic tests is proposed. An algorithm for statistical processing of the periodic test results is described, the use of which allows forming arrays with homogeneous values of the indicators under a priori limited measuring information. Analysis of distribution laws of breakdown voltage values for the transformer oils suitable and un

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Murata, Koichi, and Shinji Yasuda. "The Latest Technique of Portable Oil-Dissolved Gas Analyzer for Distribution Oil-Immersed Transformer." IEEJ Transactions on Power and Energy 112, no. 3 (1992): 214–19. http://dx.doi.org/10.1541/ieejpes1990.112.3_214.

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Khan, Yasir, and Muhammad Iftikhar Khan. "Enhancing Service Life of Power Transformer through Inhibiting the Degradation of Insulating oil by New Approach." International journal of Engineering Works 7, no. 10 (2020): 369–74. http://dx.doi.org/10.34259/ijew.20.710369374.

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Oil reclamation is a transformer insulation reconditioning technique which may be used as on-line or off-line. However, there is a need of evidence showing the effect of this process on conditions of the paper insulation, which indeed affects the life span of a transformer. This research work focuses on oil reclamation experiment on an old retired distribution transformer. Electrical testing and post-mortem analysis of the transformer were conducted, aimed at investigating the design aspects and collecting information on the insulation conditions prior to the oil reclamation. Temperature and m

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Cong, Haoxi, Minhao Zhang, and Qingmin Li. "Study on Sulfide Distribution in the Operating Oil of Power Transformers and Its Effect on the Oil Quality." Applied Sciences 8, no. 9 (2018): 1577. http://dx.doi.org/10.3390/app8091577.

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Corrosive sulfides in transformer oil could react with copper wire to produce cuprous sulfide, causing insulation failure. At present, both the quantitative measurement method and distribution of sulfur components in operating oil are not clear yet. In this paper, the existing types and contents of sulfides in oil samples with different alkyl groups and different voltage levels were investigated. With quantitative testing methods, the distribution of sulfur composition in the operating oil was analyzed. Results showed that the thiophene sulfide in transformer oil existed mainly in the form of

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Gomathy, V., and Dr S. Sumathi. "IMPLEMENTATION OF SVM USING SEQUENTIAL MINIMAL OPTIMIZATION FOR POWER TRANSFORMER FAULT ANALYSIS USING DGA." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 10, no. 5 (2013): 1687–99. http://dx.doi.org/10.24297/ijct.v10i5.4153.

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Reliable operations of power transformers are necessary for effective transmission and distribution of power supply. During normal functions of the power transformer, distinct types of faults occurs due to insulation failure, oil aging products, overheating of windings, etc., affect the continuity of power supply thus leading to serious economic losses. To avoid interruptions in the power supply, various software fault diagnosis approaches are developed to detect faults in the power transformer and eliminate the impacts. SVM and SVM-SMO are the software fault diagnostic techniques developed in

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Li, Yan, Yong Teng Jing, and Longnv Li. "Calculation and Analysis of Winding Temperature Rise for ODAF Power Transformer." Advanced Materials Research 516-517 (May 2012): 1580–83. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1580.

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The AutoCAD, Gambit and ANSYS software are used to establish transformer oil flow-temperature rise model and mesh generation based on finite volume method, fluid mechanics and numerical heat transfer. A method that calculates temperature rise distribution of transformer winding regional wire and oil by FLUENT software, and a numerical example is given for an actual transformer.

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Bokes, Peter. "Average temperature of oil-filled transformer windings with partial cooling ducts." Journal of Electrical Engineering 72, no. 1 (2021): 35–39. http://dx.doi.org/10.2478/jee-2021-0005.

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Abstract An effective one-dimensional model is presented that describes the temperature profile of a winding of an oil-filled distribution transformer with an arbitrary number of partial cooling ducts. An analytical solution of the model is applied to a specific example — a low voltage winding of a 400 kVA distribution transformer with one or two partial cooling ducts. Starting from the exact solution, a simple and practical formula for the temperature rise of similar windings has been derived that is suitable for transformer designers.

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Fu, Qiang, Meng Jun Wang, Wei Su, Yi Hua Qian, and Guo Hua Lu. "Research on Monitoring of Moisture Content in Transformer Oil by Using Sensors." Advanced Materials Research 684 (April 2013): 486–90. http://dx.doi.org/10.4028/www.scientific.net/amr.684.486.

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The moisture distribution in the transformer and variation mechanism of moisture in oil is analyzed in this paper, and using relative saturation and temperature as characteristic parameters, a detail scheme of on-line monitoring moisture content in transformer oil is put forward. The polyimide-based capacitive humidity sensor and temperature sensor are employed in on-line monitoring moisture content in oil. Computer is utilized to sample and analyze the data that sensors send out. The experiment on test transformer confirms that the sensors can work reliably, and reflect the moisture content i

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Okabe, Shigemitsu, and Takeshi Kawashima. "Charge Distribution with Return of Positive Charge in Oil Filled Transformer." IEEJ Transactions on Power and Energy 122, no. 2 (2002): 331–32. http://dx.doi.org/10.1541/ieejpes1990.122.2_331.

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Józefczak, Arkadiusz, Tomasz Hornowski, and Andrzej Skumiel. "Temperature Dependence of Particle Size Distribution in Transformer Oil-Based Ferrofluid." International Journal of Thermophysics 32, no. 4 (2010): 795–806. http://dx.doi.org/10.1007/s10765-010-0895-5.

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