Evaluation of the Properties of Mixtures of Aromatic Mineral Oil and Synthetic Ester for High-Voltage Equipment

Lyutikova, M. N.; Korobeynikov, S. M.; Коновалов, А. А.

doi:10.1109/tdei.2021.009636

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…This paper puts forward the detection technology of high-voltage electrical equipment, that is, during the AC withstand voltage test of high-voltage cable, measure the partial discharge at multiple positions of high-voltage cable synchronously, identify the small defects caused by the construction damage of high-voltage cable and the poor installation of accessories through the PDD at multiple positions, improve the completion acceptance test method of high-voltage cable, and reduce the hidden danger operation risk of high-voltage cable. It is verified that the application of AI in PDD of high-voltage electrical equipment can effectively improve the fault detection rate of high-voltage cable completion acceptance and reduce the hidden dangers of high-voltage cable belt [6] [9].…”

Section: Introductionmentioning

confidence: 86%

“…When using ultrasonic method to detect partial discharge, because corona defect and free metal particle defect are very different from the characteristics of general partial discharge signal, the atlas of corona discharge and metal particle discharge are analyzed separately. When using ultrasonic method to detect partial discharge, it is necessary to determine the background signal [7] [9].…”

Section: Characteristics Of Partial Discharge Under Ultrasonic Testingmentioning

confidence: 99%

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Partial Discharge Detection of High Voltage Electrical Equipment Based on Acoustic Imaging(AI)

Luo¹,

Yao²,

Zhang³

et al. 2023

Proceedings of the 2nd International Conference on Internet, Education and Information Technology (IEIT 2022)

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With the development of market economy, high-voltage XLPE insulated conductor, as a key component of urban transmission line, plays an important role in maintaining the safe and stable operation of urban high-voltage line. The completion acceptance test of high-voltage conductor is a defect test before the investment and operation of high-voltage cable lines. It is an important link to prevent the investment and risk operation of high-voltage cable line. Based on the actual application of acoustic imaging technology in the partial discharge test of high-voltage distribution equipment, this paper puts forward the detection algorithm of high-voltage electrical equipment, tests the traditional AC withstand voltage method and the number of defective lines and acceptance lines when acoustic imaging is applied to the partial discharge detection method of high-voltage electrical equipment. The test results show that after the acoustic imaging proposed in this paper is applied to the partial discharge detection technology of high-voltage electrical equipment, the defect detection rate in the complete acceptance test of high-voltage cable is improved, while the number of operating lines with faults caused by small defects is reduced, which effectively reduces the number of high-voltage cables with faults caused by hidden dangers. It is verified that the application of acoustic imaging in partial discharge detection of high-voltage electrical equipment can effectively improve the fault detection rate of high-voltage cable completion acceptance and reduce the hidden dangers of high-voltage cable belts. The application of acoustic imaging in partial discharge detection of high voltage electrical equipment is the general trend in the future.

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Section: Introductionmentioning

confidence: 86%

Section: Characteristics Of Partial Discharge Under Ultrasonic Testingmentioning

confidence: 99%

Partial Discharge Detection of High Voltage Electrical Equipment Based on Acoustic Imaging(AI)

Luo¹,

Yao²,

Zhang³

et al. 2023

Proceedings of the 2nd International Conference on Internet, Education and Information Technology (IEIT 2022)

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“…Moreover, the ionic compounds in the aged oil may be dissolved in NEO because of their polar nature; in addition, when the percentage of NEO is increased, this effect becomes prevalent. The increasing dissipation factor of the mixed oil may be due to the aged MO containing a high quantity of polar colloidal components and odorous hydrocarbons [ 37 ].…”

Section: Physical Mechanismsmentioning

confidence: 99%

Condition Assessment of Natural Ester–Mineral Oil Mixture Due to Transformer Retrofilling via Sensing Dielectric Properties

Karaman

Mansour

Lehtonen

et al. 2023

Sensors

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Mineral oil (MO) is the most popular insulating liquid that is used as an insulating and cooling medium in electrical power transformers. Indeed, for green energy and environmental protection requirements, many researchers introduced other oil types to study the various characteristics of alternative insulating oils using advanced diagnostic tools. In this regard, natural ester oil (NEO) can be considered an attractive substitute for MO. Although NEO has a high viscosity and high dielectric loss, it presents fire safety and environmental advantages over mineral oil. Therefore, the retrofilling of aged MO with fresh NEO is highly recommended for power transformers from an environmental viewpoint. In this study, two accelerated aging processes were applied to MO for 6 and 12 days to simulate MO in service for 6 and 12 years. Moreover, these aged oils were mixed with 80% and 90% fresh NEO. The dielectric strength, relative permittivity, and dissipation factor were sensed using a LCR meter and oil tester devices for all prepared samples to support the condition assessment performance of the oil mixtures. In addition, the electric field distribution was analyzed for a power transformer using the oil mixtures. Furthermore, the dynamic viscosity was measured for all insulating oil samples at different temperatures. From the obtained results, the sample obtained by mixing 90% natural ester oil with 10% mineral oil aged for 6 days is considered superior and achieves an improvement in dielectric strength and relative permittivity by approximately 43% and 48%, respectively, compared to fresh mineral oil. However, the dissipation factor was increased by approximately 20% but was at an acceptable limit. On the other hand, for the same oil sample, due to the higher molecular weight of the NEO, the viscosities of all mixtures were at a higher level than the mineral oil.

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“…According to [5], natural esters are miscible with mineral oil in all proportions. The mixtures themselves are also becoming widely acceptable since the price of esters is several times higher than the price of mineral oil [30]. A dielectric liquid can be obtained using mixtures of mineral oil with natural esters as the resultant, which is characterized by better fire properties (flash point, fire point), a higher degree of biodegradation and an increased water solubility limit compared to pure mineral oil [31,32].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties and Fire Safety of Mineral Oil and Low-Viscosity Natural Ester Mixtures in Various Concentrations

Dombek

Gielniak

2023

Energies

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This paper presents the results of testing the electrical and fire properties of mineral oil and low-viscosity natural ester mixtures. Properties such as breakdown voltage, relative permeability, dispersion coefficient, conductivity, flash and burn point, and lower heating values were investigated in different concentrations of mixtures of the two liquids, as well as for the base liquids. To ensure equal humidity levels, the prepared samples of mixtures and base liquids were conditioned under identical climatic conditions, resulting in samples with similar relative humidity (9 ± 3)%. The obtained measurement results for mixtures of the two fluids were related to the values obtained for the base liquids and analyzed in terms of changes in electrical properties and fire safety when used as insulating liquids in transformers. The presented results are useful for supplementing knowledge on the possibilities of using dielectric liquid mixtures in high-voltage power devices, with to the aim of using mixtures as alternatives to mineral oil.

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Evaluation of the Properties of Mixtures of Aromatic Mineral Oil and Synthetic Ester for High-Voltage Equipment

Cited by 11 publications

References 20 publications

Partial Discharge Detection of High Voltage Electrical Equipment Based on Acoustic Imaging(AI)

Partial Discharge Detection of High Voltage Electrical Equipment Based on Acoustic Imaging(AI)

Condition Assessment of Natural Ester–Mineral Oil Mixture Due to Transformer Retrofilling via Sensing Dielectric Properties

Dielectric Properties and Fire Safety of Mineral Oil and Low-Viscosity Natural Ester Mixtures in Various Concentrations

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