Abstract
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.
Highlights
IntroductionThe problems of the constant increase of electricity consumption and its supply to the end customer in the required quality and with high reliability correspond to the state of electrical equipment that participates in the whole process
Using the method of dielectric relaxation spectroscopy, we found that the mineral oil MO shows two complete polarization events in the measured frequency spectrum, in contrast, the hydrocarbon oil SD offers one complete and the other developing
We found that with increasing intensity of the time-varying electric field, there is a more excellent approximation to Debye behavior in all captured polarization processes of the investigated oils, by monitoring the parameters α, β, and Mm 00
Summary
The problems of the constant increase of electricity consumption and its supply to the end customer in the required quality and with high reliability correspond to the state of electrical equipment that participates in the whole process. The fundamental component in this system is the insulation of electrical equipment, which is required to operate as efficiently as possible [1,2,3,4,5]. The condition of the insulation system is an essential indicator of the operational reliability of power transformers and other high voltage equipment in the power system. The transformer is included as one of the main components in the transmission and distribution network, and its service life depends on the condition of the insulation system. Insulation and cooling effects are the basic properties of fluids used in transformers [6,7,8,9,10,11,12,13]
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