Abstract
In this work, the influence of semi-conductive SiC nanoparticles on the AC breakdown voltage and partial discharge development in natural ester oil FR3 is examined. Primarily, the dielectric constant and the electrical conductivity of the nanoparticles are measured following the broadband dielectric spectroscopy technique. The nanoparticles are added into the matrix following the ultrasonication process in three weight percentage ratios in order for their effect to be evaluated as a function of their concentration inside the base oil. The processing of the results reveals that the nanofluid containing SiC nanoparticles at 0.004% w/w demonstrates the highest AC dielectric strength improvement and shows the greatest resistance to the appearance of partial discharge activity. The mechanisms behind the aforementioned results are discussed in detail and confirmed by the broadband dielectric spectroscopy technique, which reveals that this particular nanofluid sample is characterized by lower dielectric constant and electrical conductivity than the one with double the weight percentage ratio.
Highlights
Accepted: 12 January 2022One of the major issues that need to be solved in the context of the smart grid of the future is to ensure the transmission and distribution of electricity taking into account the stringent regulations along with environmental protection [1]
Based on the collected 36 BD events for each sample stressed under AC voltage, the
It is obvious that the dielectric increases with an increase in the NP loading until the 0.004% w/w level (NF2 sample), strength increases with an increase in the NP loading until the 0.004% w/w level
Summary
Accepted: 12 January 2022One of the major issues that need to be solved in the context of the smart grid of the future is to ensure the transmission and distribution of electricity taking into account the stringent regulations along with environmental protection [1]. In contrast to the mineral oils used conventionally, natural ester oils (NEO) are characterized by unique and preferable properties from the industry side, such as rapid biodegradability, high moisture tolerance, less flammability and increased lifetime in comparison to mineral oils [8,9,10,11,12]. Apart from that, their higher relative permittivity is very important, as it can match that of solid insulation in order to limit electric stress in high loading situations [13]. Vegetable oils (VO) are characterized by high viscosity, which could lead to greater hotspot temperatures inside the Published: 14 January 2022
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