Dielectric Properties of Electrical Insulating Liquids for High Voltage Electric Devices in a Time-Varying Electric Field

The motivation to improve components in electric power equipment brings new proposals from world-renowned scientists to strengthen them in operation. An essential part of every electric power equipment is its insulation system, which must have the best possible parameters. The current problem with mineral oil replacement is investigating and testing other alternative electrical insulating liquids. In this paper, we present a comparison of mineral and hydrocarbon oil (liquefied gas) in terms of conductivity and relaxation mechanisms in the complex plane of the Cole-Cole diagram and dielectric losses. We perform the comparison using the method of dielectric relaxation spectroscopy in the frequency domain at different intensities of the time-varying electric field 0.5 kV/m, 5 kV/m, and 50 kV/m. With the increasing intensity of the time-varying electric field, there is a better approximation of the Debye behavior in all captured polarization processes of the investigated oils. By comparing the distribution of relaxation times, mineral oil shows closer characteristics to Debye relaxation. From the point of view of dielectric losses at the main frequency, hydrocarbon oil achieves better dielectric properties at all applied intensities of the time-varying electric field, which is very important for practical use.

[1]  A. Menti,et al.  Supraharmonic emission from a three-phase PV system connected to the LV grid , 2021, Energy Reports.

[2]  José Miguel Monzón-Verona,et al.  Characterization of Dielectric Oil with a Low-Cost CMOS Imaging Sensor and a New Electric Permittivity Matrix Using the 3D Cell Method , 2021, Sensors.

[3]  M. Z. Jamaludin,et al.  Color Index of Transformer Oil: A Low-Cost Measurement Approach Using Ultraviolet-Blue Laser , 2021, Sensors.

[4]  A. Tameev,et al.  Molecular Dynamics and Conductivity of a PTB7:PC71BM Photovoltaic Polymer Blend: A Dielectric Spectroscopy Study , 2021, ACS Applied Polymer Materials.

[5]  M. Trubyanov,et al.  Hopping Conductivity and Dielectric Relaxations in Ag/PAN Nanocomposites , 2021, Polymers.

[6]  T. Kołtunowicz,et al.  Precise Measurements of the Temperature Influence on the Complex Permittivity of Power Transformers Moistened Paper-Oil Insulation , 2021, Energies.

[7]  Mohd Hafizi Ahmad,et al.  Effects of Plasma Treated Alumina Nanoparticles on Breakdown Strength, Partial Discharge Resistance, and Thermophysical Properties of Mineral Oil-Based Nanofluids , 2021, Materials.

[8]  Sherif S. M. Ghoneim,et al.  Classification of Cellulosic Insulation State Based on Smart Life Prediction Approach (SLPA) , 2021, Processes.

[9]  Yanhui Wei,et al.  Aging Characteristics of Transformer Oil-Impregnated Insulation Paper Based on Trap Parameters , 2021, Polymers.

[10]  M. Lehtonen,et al.  Photoluminescence Spectroscopy Measurements for Effective Condition Assessment of Transformer Insulating Oil , 2021, Processes.

[11]  M. Lehtonen,et al.  Accurate Insulating Oil Breakdown Voltage Model Associated with Different Barrier Effects , 2021, Processes.

[12]  Y. Rim,et al.  Insight into Electrical and Dielectric Relaxation of Doped Tellurite Lithium-Silicate Glasses with Regard to Ionic Charge Carrier Number Density Estimation , 2020, Materials.

[13]  M. Dong,et al.  Physical Model for Frequency Domain Spectroscopy of Oil–Paper Insulation in a Wide Temperature Range by a Novel Analysis Approach , 2020 .

[14]  F. Vallianatos,et al.  Complex Electrical Conductivity of Biotite and Muscovite Micas at Elevated Temperatures: A Comparative Study , 2020, Materials.

[15]  C. Psomopoulos,et al.  A review on the requirements for environmentally friendly insulating oils used in high-voltage equipment under the eco design framework , 2020, Environmental Science and Pollution Research.

[16]  Yiyi Zhang,et al.  Aging evaluation and moisture prediction of oil-immersed cellulose insulation in field transformer using frequency domain spectroscopy and aging kinetics model , 2020, Cellulose.

[17]  M. Cernea,et al.  Lead-Free BNT–BT0.08/CoFe2O4 Core–Shell Nanostructures with Potential Multifunctional Applications , 2020, Nanomaterials.

[18]  A. Beroual,et al.  AC Dielectric Strength of Mineral Oil-Based Fe3O4 and Al2O3 Nanofluids , 2018, Energies.

[19]  M. Rajňák,et al.  Experimental study of AC breakdown strength in ferrofluid during thermal aging , 2018, Journal of Magnetism and Magnetic Materials.

[20]  Vaclav Mentlik,et al.  Development of a Biodegradable Electro-Insulating Liquid and Its Subsequent Modification by Nanoparticles , 2018 .

[21]  Chao Tang,et al.  Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers , 2018 .

[22]  Jianying Li,et al.  High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping , 2017 .

[23]  Michal Špes,et al.  The impact of electromagnetic radiation on the degradation of magnetic ferrofluids , 2017 .

[24]  S. Suwarno,et al.  A Comparison of Dielectric Properties of Palm Oil with Mineral and Synthetic Types Insulating Liquid under Temperature Variation , 2011 .