Method for the measurement of relative permittivity, dielectric dissipation factor and d.c. resistivity of insulating liquids

A number of studies have been carried out previously to investigate the suitability of palm oil as dielectric insulation fluid in transformers. Among the important studies is the ageing performance of palm oil. In this paper, a study was carried out to investigate the dielectric properties of Refined Bleached and Deodorized (RBDPO) Olein after subjected to thermal ageing. A low temperature ageing was carried out at 85°C for 5 days. The AC breakdown voltage, dielectric dissipation factor, relative permittivity and resistivity of RBDPO were examined throughout the ageing duration. It was found that the RBDPO performs reasonably well under low temperature ageing.

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Study Concerning the Influence of the Grinding Percentage on Some Electrical Properties of PA 6.6, POM and ABS by Methods for Determining Relative Permittivity and the Dielectric Dissipation Factor

Materiale Plastice ◽

10.37358/mp.17.3.4870 ◽

2017 ◽

Vol 54 (3) ◽

pp. 453-460 ◽

Cited By ~ 2

Author(s):

Ovidiu Constantin Novac ◽

Gheorghe Radu Emil Maries ◽

Dan Chira ◽

Mihaela Novac

Keyword(s):

Electrical Properties ◽

Relative Permittivity ◽

Acrylonitrile Butadiene Styrene ◽

Dissipation Factor ◽

Measurement Frequency ◽

New Material ◽

Polyamide 6.6 ◽

Dielectric Dissipation Factor ◽

Butadiene Styrene

This paper presents the influence of the grinding percentage on some electrical properties, when the process of injection is used in the production of technical commodities, made of polyamide 6.6 (PA 6.6), polyoxymethylene (POM) and acrylonitrile butadiene styrene (ABS), for different industries. The specimens produced had the following compositions: new material 100%, new material 80% + grinding 20%, new material 60% + grinding 40%, new material 40% + grinding 60%, new material 20% + grinding 80% and 100% grinding. The measurement of the electrical properties was carried out using the methods for the determination of relative permittivity and of the dielectric dissipation factor, with the method of zero by Schering bridge. It was found that increasing the percentage of grinding in samples, from 0% to 100%, determined a slight increase in the values of relative permittivity at all three polymers tested and the increase of measurement frequencies for acrylonitrile butadiene styrene and polyoxymethylene led to insignificant changes in the values of relative permittivity, while in the case of polyamide, increasing the measurement frequency led to a slight decrease in the values of relative permittivity. It was also found that increasing the proportion of grinding in the specimens, from 0% to 100%, determined a slight increase in the values of the dielectric dissipation factor in the case of polyamide and polyoxymethylene, while in the case of acrylonitrile butadiene styrene increasing the percentage of grinding in the samples resulted in insignificant changes. The increase in the measurement frequencies for the three tested polymers resulted in a decrease in the values of the dielectric dissipation factor.

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Investigation on the Dielectric Properties of Palm Oil with Silicon Carbide Doping for Transformer Application

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.317.377 ◽

2021 ◽

Vol 317 ◽

pp. 377-382

Author(s):

Muhamad Faiz Md Din ◽

Nurul Sofea Mazlan ◽

ABDUL RASHID BIN ABDUL RAHMAN ◽

Mohd Taufiq Jusoh ◽

Nur Sabrina Suhaimi ◽

...

Keyword(s):

Silicon Carbide ◽

Breakdown Voltage ◽

Palm Oil ◽

Dielectric Strength ◽

Dissipation Factor ◽

Electrode Gap ◽

Insulating Liquids ◽

Transformer Oils ◽

Tan Δ ◽

Dielectric Dissipation Factor

The dielectric strength of insulating liquids of transformer acts an important parameter in the operation of transformer. Thus, great interest and many studies have been extensively done to improve the dielectric strength. One of study is the introduction of nanoparticle in the transformer oils. Study of the nanoparticles for the last few years had been found that, it can be dispersed in the transformers oils to be nanofluids and directly enhance the transformer performance. In this study, an investigation has been carried out to focus on the effect of silicon carbide (SiC) nanoparticle to AC (alternating current) breakdown voltage of the Refined, Bleached, and Deodorized Palm Oil (RBDPO). AC breakdown test have been conduct according to the standard of the IEC 60156. Besides that, a number of parameters will be evaluated such as dielectric dissipation factor (tan δ), relative permittivity (ε), and resistivity (ρ). Based on the results of the experiment, the electrode gap at 2.5 mm having the highest AC breakdown voltage compared to the other electrode gap which are 1.0 mm, 1.5 mm and 2.0 mm. Furthermore, doping with different concentrations of the silicon carbide (SiC) in Refined, Bleached, and Deodorized Palm Oil (RBDPO) found decreasing of AC breakdown voltage from 52.09 kV (without SiC) to 45.3 kV for 0.001 g/L, 43.2 kV for 0.003 g/L and 40.1 kV for 0.005 g/L respectively.

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