Modification of epoxy resin used in high-voltage technology

2015 ◽  
Author(s):  
Lukas Harvanek ◽  
Tetjana Tomaskova ◽  
Vaclav Mentlik ◽  
Pavel Trnka
Keyword(s):  
Epoxy Resin ◽  
High Voltage

Study on Improving Interface Performance of HVDC Composite Insulators by Plasma Etching

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1036
Author(s):  
Yunqi Xing ◽  
Yixuan Wang ◽  
Jiakai Chi ◽  
Haoliang Liu ◽  
Jin Li
Keyword(s):  
Epoxy Resin ◽  
Leakage Current ◽  
Plasma Etching ◽  
High Voltage ◽  
Direct Current ◽  
Composite Insulator ◽  
High Voltage Direct Current ◽  
Bonding Performance ◽  
Static Contact ◽  
Core Rod

High-voltage direct-current composite insulators are faced with various challenges during operation, such as creeping discharge, umbrella skirt damage, abnormal heating and insulator breakage. Among them, the aging of the interface between the core rod and the sheath is one of the important causes of composite insulator failure. In order to improve the electrical resistance of the composite insulator interface, this study uses plasma etching to modify the surface of the glass-fiber-reinforced epoxy resin plastic to prepare the high-voltage direct-current composite insulator core rod–sheath samples. By analyzing the surface morphology of the epoxy resin, static contact angle and surface charge transfer characteristics, the control mechanism of the plasma etching treatment on the interface bonding performance and leakage current of composite insulator core rod–sheath samples were studied. The results show that proper etching time treatment can improve the trap energy level distribution and microstructure of epoxy resin and increase the discharge voltage along the surface; chemical bonding plasma etching can improve the interfacial bonding performance of core rod–sheath samples sheaths, reduce the leakage current of composite insulator core rod–sheath samples sheath specimens and improve their interfacial performance.

scholarly journals Surface fluorinated epoxy resin for high voltage DC application

2015 ◽  
Vol 22 (1) ◽  
pp. 101-108 ◽  
Author(s):  
A. Mohamad ◽  
G. Chen ◽  
Y. Zhang ◽  
Z. An
Keyword(s):  
Epoxy Resin ◽  
High Voltage ◽  
Fluorinated Epoxy

scholarly journals Characteristics of Gel Time and Dielectric Strength of Epoxy Composite According to the Mixing Ratio of Micro-Fillers

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5165
Author(s):  
Dong-Hun Oh ◽  
Ho-Seung Kim ◽  
Jae-Hun Shim ◽  
Young-Ho Jeon ◽  
Da-Won Kang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Epoxy Resin ◽  
High Voltage ◽  
Epoxy Composite ◽  
Dielectric Strength ◽  
Epoxy Composites ◽  
Power Equipment ◽  
Mixing Ratio ◽  
Gel Time ◽  
Micro Fillers

The dielectric strength and gel time of epoxy composites vary with the mixing ratio of epoxy resin, hardener, additives, filler, etc., and especially the gel time affects the productivity and economics of ultra-high-voltage (UHV) equipment. However, previous studies focused only on the dielectric strength of epoxy composites for the reliability of UHV equipment. Therefore, a study considering both the dielectric strength and gel time of the epoxy composite is required. In this paper, the characteristics of the gel time and dielectric strength of the epoxy micro-composites according to the mixing ratio of silica (SiO2) and alumina (Al2O3) micro-fillers without changing the mixing ratio of epoxy resin and hardener are analyzed. Experimental results show that the gel time decreased and the dielectric strength increased as the mixing ratio of the SiO2 micro-filler increased. Therefore, it is concluded that the gel time can be controlled by changing the mixing ratio of micro-fillers without changing the mixing ratio of the epoxy resin and hardener. In addition, experimental data can be used as basic data for economical production considering both the reliability and productivity of UHV power equipment.

The Thermal Expansion Characteristics of Epoxy Resin/Crepe Paper Composites for High-Voltage DC Bushing

2013 ◽  
Vol 761 ◽  
pp. 23-26
Author(s):  
Nai Kui Gao ◽  
Chun Wu ◽  
Wen Xi Zhang ◽  
Zhou Xu ◽  
Hai Yun Jin
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Epoxy Resin ◽  
High Voltage ◽  
Radial Direction ◽  
Fiber Distribution ◽  
Pure Epoxy ◽  
Sample Structure ◽  
Increasing Temperature

Abstract. In this paper, the thermal expansion characteristics of epoxy resin/crepe paper composite insulation structure for high-voltage DC bushing were studied. The results showed that when temperature was lower than the glass transition temperature(Tg) of epoxy resin, coefficients of thermal expansion along axial and radial direction of the insulation structure increased with increasing temperature; When higher than Tg, with an increasing temperature, the CTE along radial direction of the structure increased-even larger than the pure epoxy, while axial decreased. Tg is obtained by DSC. The microstructure of high-voltage DC bushing was observed by polarizing microscope. On the basis of the above analysis, the different trend in thermal expansion characteristics may be resulted from the sample structure, fiber distribution of crepe paper and the movement of epoxy resin molecular chains.

scholarly journals Feasibility Study on Electrical Properties of 20 kV Polymeric Insulator Dry Test and Rainwater Test

2021 ◽  
Vol 17 (4) ◽  
Author(s):  
Abdul Syakur ◽  
A.I.W. Nugroho ◽  
Hermawan Hermawan
Keyword(s):  
Epoxy Resin ◽  
Leakage Current ◽  
High Voltage ◽  
Electric Power System ◽  
Insulation Resistance ◽  
Current Test ◽  
Polymer Insulator ◽  
Dry Conditions ◽  
Polymer Insulators ◽  
Ceramic Insulators

Insulator is a very important equipment in an electric power system. Ceramic insulators have been widely used to support conductors in 20 kV power lines. The problem of ceramic insulators is that they are heavy, easily contaminated on the surface and require a lot of energy in the manufacturing process. Therefore, polymer insulators were developed. This paper presents the design of an epoxy resin polymer insulator with Titanium Dioxide (TiO2) as a nanofiller. The leakage current test was carried out in a high voltage laboratory by applying an AC high voltage of 50 Hz to the insulator dry conditions and the insulator wetted by rainwater contaminants. The results of the leakage current test in dry conditions are 487.6 μA, rainwater contaminated conditions are 594.93 μA, insulation resistance in dry conditions is 2.07 G-Ohms, and contaminated conditions are 1.41 G-Ohms. Based on the test results show that the insulator leakage current increases up to 22% when the surface of the insulator is contaminated with rainwater. Meanwhile, the insulation resistance decreased by up to 32% in conditions contaminated with rainwater. The value of leakage current and insulation resistance indicates that the epoxy resin insulator with TiO2 as filler is electrically feasible to use.

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