Priti Kadam ¹, R. M. Holmukhe ¹, P. B. Karandikar ²

Affiliations
1 Department of Electrical Engineering, Bharati Vidyapeeth Deemed University, College of Engineering, Pune -411043, Maharashtra, IN
2 Department of Electrical Engineering, Army Institute of Technology, Pune - 411015, Maharashtra, IN

Abstract

Objectives: To fabricate the hybrid capacitor by novel configuration and implementation of prototypes with hybrid capacitor making processes at laboratory. The purpose of this investigation is to study the effect of novel configuration in comparison with conventional two electrodes. Many researchers have concentrated on the materials used for making hybrid capacitors and very little research is available on configuration of electrodes used for hybrid capacitor which is important for further development but unfocused area. Methods: The prototypes were made by simple mixture and loading technique of electrode material. Polyethylene sheets were used as separators to prevent the short circuit between the electrode and aqueous potassium sulphate solution used as electrolyte. Statistical Analysis: The charging-discharging cycle analysis gives parameters of hybrid capacitor i.e., energy density, power density, internal resistance, specific capacitance for developed prototypes. The parameters for developed prototypes and conventional two electrode hybrid capacitor prototypes were observed. Comparative analysis for various parameters of developed prototypes was conducted and readings noted down. Findings: From charge-discharge test of hybrid capacitor it was concluded that the higher values for energy density, power density and specific capacitance can be obtained by using novel configuration of electrodes. The graphical analysis from charge-discharge test demonstrated decrease in internal resistance. It was also found that in case of hybrid capacitor with three electrodes with extra non faradic systems all the parameters are higher than conventional hybrid capacitor and hybrid capacitor three electrode system with extra faradic. Applications: Hybrid capacitors have high energy density compared to super-capacitors with better long term cycling ability. Due these additional advantages hybrid capacitors have attractive applications where high current pulses are repeatedly required. This technology is yet coming up to develop high grade hybrid capacitor which may replace batteries or may work along with the batteries in near future.

Keywords

Electrical Energy Storage, Electrodes, Electrolyte, Hybrid Capacitor, Parameters.

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Sagar Bhutada ¹, Shailesh Joshi ¹, P. B. Karandikar ², R. M. Holmukhe ²

Affiliations
1 Department of Electrical Engineering, Bharati Vidyapeeth Deemed University, College of Engineering, Pune – 411043, Maharashtra, IN
2 Department of Electrical Engineering, Army Institute of Technology, Pune – 411015, Maharashtra, IN

Abstract

Objectives: Investigation of insulation to judge the health of the condenser bushing with different techniques has been the area of interest for the researchers in recent past. Power transformers and their bushings are manufactured with oil impregnated paper insulation but their insulation integrity is comprised due to absorbed, residual or liberated moisture/ water which leads to further deterioration and catastrophic failure. Methods: Conventional measurement technique taken at rated power frequency only gives relative indication of specific dielectric properties and health of the condenser bushings. This article introduces a new approach for insulation assessment of the condenser bushings where OIP insulation as a key component has been investigated in a wide frequency response spectrum and to confirm the validity of this approach, measurements were taken on several condenser bushings of same type and age. Findings: The advance technique is a nondestructive method which evaluates the water concentration of the test object. The resulting curve is highly determined by the behavior of solid insulation and it is also sensitive to oil conductivity and insulation geometry of the bushing. Furthermore, the interpretation scheme related to dielectric response is explained. Applications: The signatures achieved helps in reliable data analysis and can be used in qualitative comparisons of bushings which compliments the available quality assurance techniques in the factory. This approach can also be used for frequent monitoring and effective moisture management at site.

Keywords

Condenser Bushing, Dielectric Spectroscopy, Insulation Assessment, Oil and Paper Insulation

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