Characteristics of leakage current and flashover on epoxy resin insulator

2014 ◽  
Author(s):  
Suwarno ◽  
S. Ardianto
Keyword(s):  
Epoxy Resin ◽  
Leakage Current

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 Analysis of Leakage Current and Insulator Resistivity for Quality Assurance of Medium Voltage Network Polymer Insulators Alumina - SiO2 in Tropical Climate Simulator Room

Teknik ◽  
2021 ◽  
Vol 42 (1) ◽  
pp. 10-19
Author(s):  
Agnes Manik Sari Utami ◽  
Abdul Syakur ◽  
Hermawan Hermawan
Keyword(s):  
Epoxy Resin ◽  
Leakage Current ◽  
Test Chamber ◽  
Tropical Climate ◽  
Climatic Conditions ◽  
Medium Voltage ◽  
Temperature And Humidity ◽  
Voltage Insulator ◽  
Polymer Insulators ◽  
The Relationship

The tropical climate of Indonesia, which has moderately high rainfall, has an impact on the output of outdoor insulators. The presence of chemical particles, pollen, and salt in the air will bind to the insulating material's outer surface and settle, resulting in crystallization that allows the insulating material's surface roughness to increase. One of the insulators that are being produced is an insulator made of epoxy resin. The injection of fillers is used to further improve the durability of the outdoor epoxy resin insulators installed in tropical climatic conditions. Epoxy resin from bisphenol A-epichlorohydrin and polyaminoamide combined with silane, alumina, and SiO2 is used as research materials. The parameters examined were leakage current and resistance to insulation. The use of silane as a hardener will also improve the resistivity on the surface of the insulator, which makes it more difficult to flow or reduces the leakage current. Alumina is well-known for being a solid heat and voltage insulator. The addition of SiO2 to the epoxy resin insulating material increases the insulator's mechanical strength in the form of tensile and compressive strength. With fluctuations in temperature and humidity, the artificial tropical environment is replicated in a test chamber. The value of the leakage current increases with an increase in temperature and humidity. The correlation between air temperature and humidity and insulation resistance is inversely proportional, the higher the temperature applied to the insulator, the lower the insulator resistivity. The same refers to the relationship between air humidity and resistance to insulation. The higher the humidity applied to the insulator, the lower the insulator resistivity. At a test voltage of 11 kV, a humidity of 60%, and a temperature variation of 25oC, the leakage current of epoxy resin insulators is up to 9.2 uA lower than in a factory-made SiR insulator. The leakage current and insulator resistivity's number is already in the good and protected range such that the insulator can be used and reproduce.

Effect of GO on DC Insulation Properties of Epoxy Composites and Its Application in Anticorrosive Coatings

2020 ◽  
Vol 15 (3) ◽  
pp. 398-403
Author(s):  
Ming-He Chi ◽  
Yang Yu ◽  
Jia-Yi Xu ◽  
Si-Qi Zhang ◽  
Xiao-Rui Zhang
Keyword(s):  
Electric Field ◽  
Epoxy Resin ◽  
Leakage Current ◽  
Salt Spray ◽  
Electrochemical Corrosion ◽  
Water Soluble ◽  
Neutral Salt ◽  
Pure Epoxy ◽  
Anticorrosive Coatings ◽  
Epoxy Emulsion

Due to the fact that surfactant in epoxy emulsion can increase electron migration during electrochemical corrosion protection, which reduces the bulk resistivity of epoxy resin, the performance of water-soluble epoxy anticorrosive coatings cannot meet the normal use requirements, which restricts the progress of waterborne anticorrosive coatings. In this paper, GO was used as filler to modify epoxy emulsion to improve DC breakdown performance of polymer composite and reduce leakage current of composite under electric field. The test results showed that when KH550 modified multilayer GO was added to epoxy resin, the neutral salt spray resistance time of the coating was 600 h when the powder addition amount was 1.2 wt%. The initial corrosion voltage was –0.6832 V by Tafel curve test. At this point, the DC breakdown voltage of 35 kV/mm, compared to the pure epoxy resin was increased by 140%, the volume resistivity of 5 × 1016 Ωm., compared to the pure epoxy resin increased two orders of magnitude. It was found that although GO is conductive, a well-dispersed modified GO can be formed into a capacitive structure in epoxy resins, which has the ability to store charge, thereby reducing the leakage current of the material under the electric field and blocking the electronic path. Although this structure has little significance for the application of traditional insulation materials, in the field of anticorrosive coatings, this characteristic of reducing leakage current can assist materials to weaken the occurrence of electrochemical corrosion. Meanwhile, the excellent chemical stability and physical isolation ability of graphene can also guarantee the anticorrosive performance of coatings.

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.

Sign in / Sign up

Export Citation Format

Share Document