High thermal conductivity transformer oil filled with BN nanoparticles

Abstract

Liquid insulation plays a significant role in the design and operation of power system. There is good evidence in the literature that the addition of nanoparticles to conventional transformer oils can lead to significant increases both in electrical and thermal characteristics. In this paper, spherical BN nanoparticles with high thermal conductivity were added into transformer oil to form nanofluids, with the aim of enhancing electrical and thermal properties. Electrical properties and thermal characteristics of oil samples before and after modification were measured. It was found that the nanofluids have higher AC breakdown voltage and relative permittivity, lower dissipation factor which indicates better electrical properties compared with pure oil. In order to investigate the effect of BN nanoparticles on thermal properties, temperature changes and heat distribution of the nanofluids with different concentrations of BN particles in thermal conductivity process were measured by an infrared thermal imager and a temperature sensor.Obtained results showed that, under the same experimental condition, the heat dissipation of nanofluids with higher concentration of BN particles was faster. It is concluded that the added BN fillers have a very significant effect on electrical and thermal properties in transformer oil-based fluids.

Transformer Oil Nanofluids by Two Dimensional hexagonal Boron Nitride Nanofillers

“…% of h-BN nanosheets. Figure 6b shows relative comparison of performance of the nanofluids between the present work and that reported by Du et al [9]. The theoretical emphasis on the breakdown phenomena of the nanofluids has been clarified by statistical analysis using the Weibull distribution function [10], which for any random variable say "x" (BDV in the present study) is defined as [10]:…”

“…The effect of interfacial layer in scavenging the free charges for spherical (particle) and 2D morphologies of the nanofillers are presented in Figure 8. Previously reported BN particle of 50 nm size [9] and presently used h-BN nanosheets (2D) have almost similar resistivity and conductivity. However, with the same volume fraction, 2D nanosheets of h-BN provide a huge area of the interfacial layer and high aspect ratio resulting into more trapping of free electrons and create noteworthy augmentation of BDV as compared to the spherical morphology of BN family, as furnished in Figure 6b.…”

“…The reason behind the rise in resistivity is due to the fact that h-BN sheets are capable of trapping charged entities injected in the oil during the measurement procedure. This will lead to the decrease of mobile charges and make the oil more resistive [9], which is reflected in the decrease of dielectric loss.…”

“…Among the materials described above, highly insulating h-BN or white graphene unveils more multipurpose assets such for example outstanding thermal conductivity, first-rate mechanical steadiness, and prominent chemical dullness. Du et al [9] demonstrated that BN nanoparticle improves thermal responses, electrical insulation and BDV of the transformer oil. However, BN particles agglomerate easily leading to lowering of vital properties.…”

The Effect of Nano-Silica Modified With Silane Coupling Agents on the Diffusion Behavior of Water Molecules in Palm Oil Based on Molecular Simulation

“…Recently, in the dielectric materials field, the usage of nanomaterial modification technology has been the research hotspot [1], [2], and it can be used to improve the electricity [3], [4], heat conduction [5], [6] and aging [7], [8] of insulation oil. Yuxiang Zhong and his team found that TiO 2 nanoparticles not only enhance the AC breakdown voltage of ester-based nanofluid, but also improve the partial discharge performance of ester-based nanofluids compared to natural esters [9].…”