Flashover voltage of epoxy-resin surfaces in carbonized transformer oil

2002 ◽  
Author(s):  
M. Krins ◽  
H. Borsi ◽  
E. Gockenbach
Keyword(s):  
Epoxy Resin ◽  
Transformer Oil ◽  
Flashover Voltage

A facile dip-coating approach to stable superhydrophobic SiO2/epoxy resin membrane preparation for micro-water separation in transformer oil liquids

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 92947-92953 ◽  
Author(s):  
Liangwei Zhou ◽  
Ping Yu ◽  
Yunhua He ◽  
Huanhuan Xia ◽  
Xinliang Guo ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Dip Coating ◽  
Transformer Oil ◽  
Membrane Preparation ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Resin Membrane

Oil–water separation apparatus, in which the membrane was put at the bottom of the ultrafiltration cup. When the transformer oil was passed through the membrane, the water was retained above the membrane.

The Scrutiny of the Insulation Breakdown Strength for the Nanocomposite Oxide Doped Epoxy Resin Insulator with Different Electrodes by Using Positive Impulse Voltage

2016 ◽  
Vol 705 ◽  
pp. 63-67
Author(s):  
Mingkhouan Xayyavong ◽  
Kittipong Tonmitr ◽  
Norrawit Tonmitr ◽  
Eiji Kaneko
Keyword(s):  
Epoxy Resin ◽  
Breakdown Strength ◽  
Dielectric Materials ◽  
Transformer Oil ◽  
Voltage Level ◽  
Spherical Electrode ◽  
Zinc Oxides ◽  
Impulse Voltage ◽  
Insulation Breakdown ◽  
Electrode Point

This research presents the ratio of doping nanocomposite oxides in dielectric materials for increasing the efficiency strength and endurance voltage. Tests were conducted and analyzed the characteristics of epoxy nanozinc oxides. By using positive standard impulse voltage abilities of nanocomposite oxides were used as electrical insulators-epoxy resin doped with zinc oxides nanocomposite in ratios of 0, 5, 10, 15, and 20% by weight. And the design of electrodes embeds in the specimens with 4 types of electrode, as needle electrode, point electrode, spherical electrode and the partial spherical electrode. When adjusted the impulse voltage level of 75kV to the specimen immersed in transformer oil. The experiment aforementioned to investigate the ratios damages on insulator surfaces and the number of breakdowns. The microscopes with magnification levels of 20-800X were used to view the damages on insulator surfaces. Results, it was found that regarding specimens used for doping an epoxy resin with zinc oxides nanocomposite in a ratio of 5% had high withstand insulator with electrode types. The partial spherical electrode tested with positive impulse standard voltage has destructive distance lower damage than other electrode types.

scholarly journals A Study of the Behaviour of Water Droplets Under the Influence of Uniform Electric Field in Epoxy Resin Samples

2012 ◽  
Vol 63 (3) ◽  
pp. 196-200 ◽  
Author(s):  
Yonghong Cheng ◽  
Xu Zhao ◽  
Michael Danikas ◽  
Despoina Christantoni ◽  
Pavlos Zairis
Keyword(s):  
Electric Field ◽  
Epoxy Resin ◽  
Electric Fields ◽  
Uniform Electric Field ◽  
Droplet Volume ◽  
Water Droplets ◽  
Water Conductivity ◽  
Volume Number ◽  
Flashover Voltage ◽  
Droplet Behavior

A Study of the Behaviour of Water Droplets Under the Influence of Uniform Electric Field in Epoxy Resin SamplesWater droplets on the surface of epoxy resin samples were investigated under the influence of uniform electric fields. Several parameters of water droplets were investigatedwrtthe flashover voltage of the epoxy resin samples, such as water conductivity, droplet volume, number of droplets as well as the positioning of the droplets regarding the electrodes. The droplet behavior is affected by the above mentioned parameters. Perhaps the most striking conclusion is that the flashover voltage depends more on the positioning of the dropletswrtthe electrodes than on the droplet volume and/or number of droplets.

scholarly journals Behaviour of Water Droplets Under the Influence of a Uniform Electric Field in Nanocomposite Samples of Epoxy Resin/TiO2

2013 ◽  
Vol 3 (5) ◽  
pp. 511-515 ◽  
Author(s):  
Α. Bairaktari ◽  
M. Danikas ◽  
X. Zhao ◽  
Y. Cheng ◽  
Y. Zhang
Keyword(s):  
Electric Field ◽  
Epoxy Resin ◽  
Tio2 Nanoparticles ◽  
Water Droplet ◽  
Uniform Electric Field ◽  
Droplet Volume ◽  
Water Droplets ◽  
Water Conductivity ◽  
Flashover Voltage

In this paper nanocomposite samples of epoxy resin and TiO2 nanoparticles were investigated with water droplets on their surface. A uniform electric field was applied and the behaviour of the water droplets was observed. Parameters that were studied were the water conductivity, the droplet volume, the number of droplets and the droplet positioning with respect to (w.r.t.) the electrodes. All above mentioned parameters influence the flashover voltage of the samples. It is to be noted that – at least in some cases – the water droplet positioning w.r.t. the electrodes was more important in determining the flashover voltage than the droplet volume.

scholarly journals Perkiraan Tegangan Lewat Denyar Isolator Tegangan Menengah 20 kV Keramik dan Resin Epoksi berdasarkan Data Arus Bocor

2019 ◽  
Vol 11 (1) ◽  
pp. 34-38
Author(s):  
Valdi Rizki Yandri ◽  
Herisajani Herisajani ◽  
Fitriadi Fitriadi
Keyword(s):  
Fourier Transform ◽  
Epoxy Resin ◽  
Leakage Current ◽  
Current Data ◽  
Digital Data ◽  
High Humidity ◽  
Climate Conditions ◽  
Digital Oscilloscope ◽  
Flashover Voltage ◽  
High Pollution

This paper explains the research results of leakage current data and estimation of flashover voltage on ceramics and epoxy resin as 20 kV outdoor insulator in a chamber with tropical climate conditions. The waveform of leakage current (LC) was measured using a digital oscilloscope. The digital data was transferred to a personal computer using a RS-232 cable. The digital data was analyzed using Fast Fourier Transform. The result showed that LC was affected by various environment conditions like temperature, humidity and pollution. LC of ceramics insulator was higher than epoxy resin insulator in low temperature, high humidity and high pollution condition.

scholarly journals Investigation of Factors Affecting Partial Discharges on Epoxy Resin: Simulation, Experiments, and Reference on Electrical Machines

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6621
Author(s):  
Dimosthenis Verginadis ◽  
Athanasios Karlis ◽  
Michael G. Danikas ◽  
Jose A. Antonino-Daviu
Keyword(s):  
Power Systems ◽  
Epoxy Resin ◽  
Partial Discharges ◽  
Electrical Machines ◽  
Synchronous Generators ◽  
Water Conductivity ◽  
High Mechanical Strength ◽  
Factors Affecting ◽  
Simulink Model ◽  
Flashover Voltage

In Power Systems, Synchronous Generators (SGs) are mostly used for generating electricity. Their insulation system, of which epoxy resin is a core component, plays a significant role in reliable operation. Epoxy resin has high mechanical strength, a characteristic that makes it a very good material for reliable SG insulation. Partial Discharges (PDs) are a constant threat to this insulation since they cause deterioration and consequential degradation of the aforementioned material. Therefore, it is very important to detect PDs, as they are both a symptom of insulation deterioration and a means to identify possible faults. Offline and Online PDs Tests are described, and a MATLAB/Simulink model, which simulates the capacitive model of PDs, is presented in this paper. Moreover, experiments are carried out in order to examine how the flashover voltage of epoxy resin samples is affected by different humidity levels. The main purpose of this manuscript is to investigate factors, such as the applied voltage, number, and volume of water droplets and water conductivity, which affect the condition of epoxy resin, and how these are related to PDs and flashover voltages, which may appear also in electrical machines’ insulation. The aforementioned factors may affect the epoxy resin, resulting in an increase in PDs, which in turn increases the overall Electrical Rotating Machines (EMs) risk factor.

scholarly journals Effect of Bismuth Ferrite Nanometer Filler Element Doping on the Surface Insulation Properties of Epoxy Resin Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2200
Author(s):  
Jun Xie ◽  
Chaoxuan Xiao ◽  
Shuai Shao ◽  
Qijun Duan ◽  
Qing Xie ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Dissipation Rate ◽  
Mass Fraction ◽  
Bismuth Ferrite ◽  
Resin Composites ◽  
Element Doping ◽  
Flashover Voltage ◽  
Epoxy Resin Composites ◽  
Filler Mass ◽  
Co Doped

In the direct current electric field, the surface of epoxy resin (EP) insulating material is prone to charge accumulation, which leads to electric field distortion and damages the overall insulation of the equipment. Nano-doping is an effective method to improve the surface insulation strength and DC flashover voltage of epoxy resin composites. In this study, pure bismuth ferrite nanoparticles (BFO), as well as BFO nanofillers, which were doped by La element, Cr element as well as co-doped by La + Cr element, were prepared by the sol-gel method. Epoxy composites with various filler concentrations were prepared by blending nano-fillers with epoxy resin. The morphology and crystal structure of the filler were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests. The effects of different filler types and filler mass fraction on the surface flashover voltage, charge dissipation rate, and trap characteristics of epoxy resin composites were studied. The results showed that element doping with bismuth ferrite nanofillers could further increase the flash voltage of the composites. The flashover voltage of La + Cr elements co-doped composites with the filler mass fraction of 4 wt% was 45.2% higher than that of pure epoxy resin. Through data comparison, it is found that the surface charge dissipation rate is not the only determinant of the flashover voltage. Appropriately reducing the surface charge dissipation rate of epoxy resin composites can increase the flashover voltage. Finally, combining with the distribution characteristics of the traps on the surface of the materials to explain the mechanism, it is found that the doping of La element and Cr element can increase the energy level depth and density of the deep traps of the composite materials, which can effectively improve the flashover voltage along the surface of the epoxy resin.

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