• Title/Summary/Keyword: Insulating Oil

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A study on an experimental basis a special character of insulating oil the use of a transformers (변압기용 절연유의 특성에 관한 실험적 연구)

  • Kim, Sung-Dae;Park, Il-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.11
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    • pp.5188-5193
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    • 2011
  • This research is for temperature control of insulating oil inside the transformer. After I designed and manufactured various systems using Peltier element, which was thermal element, and Heat pipe, which was a cooling system, without electric power. The optimum system could be made by applying them to the temperature control for the insulating oil. I could verify that the combination type of Heat pipe 100 W+ Peltier 100W has a more outstanding capacity than pure Heat pipe 300 W within 60 degrees Celsius through experiments. Through this, I verify that the method of a proper design is prominent, and make an attempt at contribution to power saving effect and more effective control of Distributing board by using this combination type.

A Study on the Aging Diagnosis of Transformer oil by Spectrometric and Electroanalytical Methods (분광광도법 및 전기분석법을 이용한 절연유의 경년열화 진단에 관한 연구)

  • 김경렬;곽희로;윤영자;남궁미옥;이동준
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.12 no.2
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    • pp.15-20
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    • 1998
  • The furfural, generated by decomposition of insulating paper, the amount of metal in insulating oil, and tano(electrical properties of insulating oil)have been studied for the insulating oil in pole transformer with accelarated thermal aging test. It has been found that tan $\delta$ is affected by adding components of the transformer. The examination of amount of metal, which exhibits catalytic behavior to oxidation of insulating oil, suggested that the amounts of copper increase with degradation time. A comparison between tano and copper amount suggested that the amounts of copper for attention are above 0.2[pp]). Finally, the examination of amount of furfural revealed that the amounts of furfural increase with degradation time. As a consequence, these results could be used for diagnosis of pole transformer.former.

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Analysis of Accelerated Aging Natural Ester Oil and Mineral Oil in Distributional Transformers (배전용 변압기에서의 고온열화와 열 사이클 열화에 따른 식물유와 광유의 특성 분석)

  • An, Jung-Sik;Choi, Sun-Ho;Bang, Jeong-Ju;Jung, Joong-Il;Huh, Chang-Su
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.6
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    • pp.1163-1168
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    • 2011
  • Most transformers use insulating and cooling fluids derived from petroleum crude oil, but mineral oil has some possibility of environmental pollution and fire with explosion. vegetable oil fluids extracted from seed has superior biodegradation and fire-resistant properties including an exceptionally high fire point enhancing fire safety. In this study, it is aimed at the practicality of substituting natural ester dielectric fluid for mineral oil in liquid insulation system of transformers. As a rise in coil winding temperature has a direct influence on transformer life time, it is important to evaluate the temperature rise of coil winding in vegetable oil in comparison with mineral oil. Four transformers for the test are designed with 10KVA, 13.2KV, one phase unit. The temperature are directly measured in insulating oil of these transformers with the two sorts of natural ester and mineral oil dielectric fluid respectively. Experiment for aging carry out two means. First means remained $120^{\circ}C$ that transformer of mineral oil were operated at 185% load. Second means is that insulating oils of two natural ester and mineral oil were aged by thermal cycles repeating from $30^{\circ}C$ to $120^{\circ}C$. For the heating, Transformers were operated at 185% load. For the cooling, cooling system was operated in the chamber. Samples were analyzed at 42, 63, 93, 143, 190, 240 300cycles. Analysis contents are dielectric strength, total acid value. Mineral oils compared results of first means with results of second means. And compared two sort natural esters respectively with mineral oil in second means.

Analysis of DC insulation and properties of epoxy/ceramic composites with nanosized ZnO/TiO2 fillers

  • Kwon, Jung-Hun;Kim, Yu-Min;Kang, Seong-Hwa;Kim, Pyung-Jung;Jung, Jong-Hoon;Lim, Kee-Joe
    • Journal of Ceramic Processing Research
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    • v.13 no.spc2
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    • pp.332-335
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    • 2012
  • A molded transformer is maintenance-free, which makes it unnecessary to replace the insulating material, like in an oil-filled transformer, because the epoxy, which is a molded insulating resin, does not suffer variations in its insulating performance for heat cycles over a long time, as compared to insulating oil. In spite of these advantages, a molded transformer may still be accessed by the user, which is not good in regards to reliability or noise compared to the oil transformers. In particular, a distrust exists regarding reliability due to the long-term insulating performance. These properties have been studied in regards to the improvement of epoxy composites and molded transformer insulation. There have nevertheless been insufficient investigations into the insulation properties of epoxy composites. In this study, it is a researching of the epoxy for insulating material. In order to prepare the specimens, a main resin, a hardener, an accelerator, and a nano/micro filler were used. Varying amounts of TiO2 and ZnO nano fillers were added to the epoxy mixture along with a fixed amount of micro silica. This paper presents the DC insulation breakdown test, thermal expansion coefficient, and thermal conductivity results for the manufactured specimens. From these results, it has been found that the insulating performance of nano/micro epoxy composites is improved as compared to plain molded transformer insulation, and that nano/micro epoxy composites contribute to the reliability and compactness of molded transformers.

Gas Detector for Hydrogen Dissolved in Transformer Oil

  • Seo Ho-Joon;Hwang Kyu-Hyun;Rhie Dong-Hee
    • KIEE International Transactions on Electrophysics and Applications
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    • v.5C no.2
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    • pp.72-75
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    • 2005
  • In oil-filled equipment such as transformers, partial discharge or local overheating will precede a final shutdown. Accompanied with such problems is a decomposition of insulating material into gases, which are dissolved into the transformer oil. The gases dissolved in oil can be separated with some membranes based on the differences in permeability of membranes to different gases. This paper discuss the permeability characteristics of several membranes for separation hydrogen gas in oil. With result of this paper, it may become possible to detect fault-related gases from transformer oil and predict incipient failures in the

Development of Preventive Diagnosis Techniques for Transformer Oil by Capacitive Sensor (전기용량형 센서를 이용한 변압기 절연유 열화진단용 예방진단기법 개발)

  • Kim, Ju-Han;Han, Sang-Ok
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.2061_2062
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    • 2009
  • Within serviced period of time in transformer, thermal stress is the most influential parameter affecting the aging behavior of an insulation system. The thermal stress on the insulation system may occur from operation in a high temperature environment due to Joule's heat at winding coils. This paper describes a development of capacitive sensor and preventive diagnosis techniques for electrical insulating oil, widely used for power and distribution transformer. To survey the dielectric properties of the virgin and used mineral insulating oil, we utilized the highly precise measuring system of KRISS. And the results were used to determine the design factors of the sensor. To evaluate diagnosis by the sensor, we performed accelerated aging test about insulating oils. The condition of aged specimens were investigated by measurements of relative permittivity i.e. capacitance change by capacitive sensor.

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The Study on the Electric Potential Variation of Needle Electrodes by Charged Insulating Oil in the Charge Reducer (대전된 절연유에 의한 제전관내 침전극의 전위변화에 관한 연구)

  • Kim, Y.I.;Kim, Y.B.;Kim, D.S.;Park, J.Y.;Cho, Y.K.;Lee, D.C.
    • Proceedings of the KIEE Conference
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    • 1994.07b
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    • pp.1583-1585
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    • 1994
  • In this paper, we investigated the relationship between the needle electrode current and the needle electrode potential, The needle electrode potentials have influence on the needle electrode currents absolutely. So, to increase the needle electrode currents there is necessary to keep a high electric field if the charge reducer. for this, high insulation materials must be selected, and charge density of insulating oil must be high. In this experiment, the more a charge density of insulating oil increases, the more a needle electrode potential increases. So we could know what increasement of needle electrode potential increases a needle electrode current.

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A Study on the Age Degradation Kinetics of Pole Transformer Oil (주상변압기 절연유의 경년열화반응 속도론에 관한 연구)

  • 남영우
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.11 no.1
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    • pp.99-105
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    • 1997
  • In the paper, aging of insulating oil in pole transformer has been studied by performing accelerated thermal aging test. Dissolved gases were extracted by air bubbling method. Concentration of dissolved gases were modified by extraction ratio of each gases in insulating oil. Aging of insulating materials were proceeded by thermal degradation and oxidation reaction. Both of the reactions followed zeroch order kinetics. Formation rate equations for hydrocarbons, carbon oxides, and hydrogen were derived. It was conformed by gas analysis and UV-Visible spectrophotometric method that iron core and copper coil in pole transformer act as catalyst during the aging process.

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Development of Capacitive Sensor for the Diagnosis of Electrical Insulating Oil (전기절연유의 열화진단을 위한 정전용량 센서개발)

  • Choi, N.H.;Kim, H.J.;Kim, J.H.;Kim, H.S.;Han, S.O.
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1609-1611
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    • 2003
  • This paper presents the results on the development of capacitive sensor for the diagnosis of electrical insulating oil, widely used for power transformer. To survey the dielectric properties of the new and used mineral insulating oil, we utilized the highly precise measuring system of KRISS. And the results were used to determine the design factors of the sensor. To evaluate the operational and the hysteresis characteristics of the sensor, we constructed a test chamber, including dielectric property measuring system. Through the results we could confirm the superior characteristics of the newly developed sensor.

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Study of Dielectric Properties of a Potential RBD Palm Oil and RBD Soybean Oil Mixture as Insulating Liquid in Transformer

  • Azmi, Kiasatina;Ahmad, Azmier;Kamarol, Mohamad
    • Journal of Electrical Engineering and Technology
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    • v.10 no.5
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    • pp.2105-2119
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    • 2015
  • This paper reported the experimental result of dielectric properties of Refined, Bleached and Deodorized Palm Oil (RBDPO) combined with 0-50% of Refined, Bleached and Deodorized Soybean Oil (RBDSO). The dielectric strength and relative permittivity of RBDPO/RBDSO was higher compared to mineral oil at all ranges of ratios and temperatures which indicated a positive sign for its possible use as insulating liquid in a transformer. All ratios of the RBDPO/RBDSO mixture also demonstrated lower dissipation factor compared to mineral oil at 40℃, 70℃ and 90℃. Apart from that, the kinematic viscosity for the oil mixtures shown exceeded the IEC 60296 as well as the mineral oil results. 70%RBDPO/30%RBDSO mixture ratio was chosen as the best mixing percentage after comparison was made with the mineral oil and IEC 60296 standard where the mixture accumulated the most satisfactory of dielectric properties hence making it as the potential candidate for palm and soybean-based transformer oil.