Hot spot temperature for 154 kV transformer filled with mineral oil and natural ester fluid

Kweon, Dong-Jin; Koo, Kyosun; Woo, Jungwook; Kim, Yungsig

doi:10.1109/tdei.2012.6215107

Cited by 47 publications

(11 citation statements)

References 5 publications

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“…This can show that the proper selection of the candidate ) was used to roughly estimate as of 39 what would be the new when using a new liquid compared 40 to the old one. The reported data of measured inlet and outlet 41 liquid temperatures under similar transformer loading levels 42 indicate that mineral oils have a near 1.6 higher ̇ compared 43to natural ester[9,11] which supports the estimated…”

mentioning

confidence: 56%

“…It was observed that when using ester liquid the flow velocities within radial cooling ducts were lower, compared to when using mineral oil, which was the reported reason for the increase in the winding temperatures. A 15 MVA, single phase, 154 kV/22.9 kV transformer was filled with mineral oil and then with natural ester [11]. and a software to process captured images [18].…”

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confidence: 99%

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Experimental Study of the Influence of Different Liquids on the Transformer Cooling Performance

Daghrah

Wang

Liu

et al. 2019

IEEE Trans. Power Delivery

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Mineral oil is traditionally used in liquid immersed transformers to act as a coolant, an information carrier, and as an electrical insulator. Emerging alternative transformer liquids provide advantages, such as improved fire safety and better biodegradability, of which transformer operators would like to utilize. In this paper, an experimental study is conducted to compare the thermal performance of a mineral hydrocarbon transformer oil, a gas-to-liquid hydrocarbon transformer oil, and a synthetic ester transformer liquid as coolants in a zigzag disc type winding model. Comparisons are made under liquid directed cooling modes and under liquid natural cooling modes. It was found that under both cooling modes, the mineral based transformer oil and the gas-to-liquid based transformer oil behaved almost with comparable liquid flow and temperature distributions. Under liquid directed cooling modes, the synthetic ester gave more uniform flow distribution and delayed the occurrence of liquid reverse flow compared to the other oils. Under liquid natural cooling modes and using the zigzag disc type winding model, synthetic ester due to its higher viscosity caused lower inlet flow rate to develop under the specific tested retrofilling conditions which resulted in less uniform oil flow distribution within the pass and higher hot spot temperature.

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confidence: 56%

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confidence: 99%

Experimental Study of the Influence of Different Liquids on the Transformer Cooling Performance

Daghrah

Wang

Liu

et al. 2019

IEEE Trans. Power Delivery

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“…In March 2012, M. Augusta et al [36] described cooling capacity and viscosity of esters are better than mineral oil and performance of natural esters is appreciable than synthetic esters. In June 2012, Dongjin Kweon et al [37] investigated thermal performance of insulation paper by hot spot and optical measurements for ester and mineral oils filled transformers and described reduced loading or enhanced cooling methodologies were not required for designing ester filled transformers. In July 2012, J. Hao et al [38] described the frequency dielectric response of pressboard impregnated in esters and recommended esters for enhanced insulation life of transformers.…”

Section: Insulation Paper Studiesmentioning

confidence: 99%

Review on ester based dielectric liquids for transformer insulation technology

Rao

Sood

Jarial

2015

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

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Ester based dielectric fluids were found to beat mineral oils in thermal and environmental aspects. Hence there is a great need of research on ester oils. The present paper is a review of 84 published articles. Owing to length of the document; exceptions were made to include a citation if a publication contributed a significantly technical viewpoint on usage of ester oils for transformer insulation technology. The selected literature has been classified into relevant sections to make researchers convenient in obtaining literature. Some citations spanned for more than one section, efforts were made to include such citations in one of the most relevant section. The present paper will be useful to the industry and researchers to know the significance and need of ester based dielectrics to the present day scenario.

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“…The remarkable achievement was a measurement performed by Kweon on a 154 kV transformer during the temperature-rise test. The fluorescent fiber sensors were placed on the windings in advance for a local temperature measurement [10]. Thereafter, Gong built a temperature measurement system based on FBG (Fiber Bragg Grating) sensor for a 110 kV transformer [11].…”

Section: Introductionmentioning

confidence: 99%

Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

Liu

et al. 2020

Sensors

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Traditional monitoring methods cannot obtain the overall thermal information for power transformers. To solve this problem, a distributed fiber optic sensor (DFOS) was creatively applied inside an operating 35 kV power transformer by highly integrating with the electromagnetic wires. Then, the transformer prototype with totally global sensing capability was successfully developed and it was qualified for power grid application through the strict ex-factory tests. The as designed optical fiber sensor works stably all the time with a temperature accuracy of ±0.2 °C and spatial positioning accuracy of 0.8 m. Based on the obtained internal temperature distribution, Gaussian convolution was further applied for the signal processing and hereby, the hotspots for all the windings and iron cores could be accurately traced. The hottest points were located at 89.1% (55 °C) of the high voltage winding height and 89.7% (77.5 °C) of the low voltage winding height. The actual precise hotspot location corrected the traditional cognition on the transformer windings and it would serve as an essential reference for the manufactures. This new nondestructive internal sensing and condition monitoring method also exhibits a promising future for the DFOS applying in the high-voltage electrical apparatus industry.

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Hot spot temperature for 154 kV transformer filled with mineral oil and natural ester fluid

Cited by 47 publications

References 5 publications

Experimental Study of the Influence of Different Liquids on the Transformer Cooling Performance

Experimental Study of the Influence of Different Liquids on the Transformer Cooling Performance

Review on ester based dielectric liquids for transformer insulation technology

Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

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