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Partial discharge (PD) in power transformer degrades the dielectric insulation and results in insulation failure and breakdown after a long period. In fact, a partial discharge detector can gather signals from two or more PD sources which increase the difficulty on pattern recognition and insulation state assessment. How to separate multiple PD signals is meaningful to subsequent data processing....
The accuracy of conventional DGA interpretation methods can be different when each of these methods are used in different places or different circumstances. Rogers Ratio Method (RRM), IEC Ratio Method (IRM) (Basic Gas Ratios Method), GB/T 7252 (National Standard of the People's Republic of China) are popular conventional methods for interpreting the possible faults indicator of transformer in Indonesia...
Hundreds of features have been extracted from phase resolved partial discharge (PRPD) pattern and PD waveforms to represent and recognize typical defects. Several feature selection and dimension reduction methods for pattern recognition are presented in this paper. Feature selection algorithms including forward feature selection, backward feature selection and floating forward feature selection (FFFS)...
Dielectric barrier discharge (DBD) has drawn great attentions in recent years, and the discharge physic is one of the research focuses. In this paper, both Townsend ionization coefficient α and secondary electron emission coefficient γ (SEEC) in DBD are discussed. The value and partial derivative of α in pure helium are compared with that of argon theoretically, which is related to the breakdown voltage...
The electrical behavior of transformer oil subjected to high electric-field and the possible breakdown phenomena is of great practical interest, since this dielectric liquid has been widely used in high-voltage power apparatus and pulse power systems. Compared with the discharge mechanisms and behaviors derived from various gas atmosphere, the initiation and evolution are more complicated, and the...
The voltage, current and temperature are used as input variables in this paper. The SOC estimation of the lithium iron phosphate battery is achieved by the method of multivariate adaptive regression splines (MARS). The data obtained by the test is standardized, which can be then used in the train of the SOC estimation mathematical model. After that the model is verified. The simulation results show...
The oil-paper insulation has been widely used in large power equipment, and thermal and electrical stresses are the two main origins causing the deterioration and failure of oilpaper insulation system. In this paper, accelerated aging experiments of oil impregnated paper are conducted and partial discharge (PD) measurement are performed under typical defect models, i.e. protrusion, surface discharge...
This paper investigates the partial discharge characteristics of void defect in SF6 gas insulation under stepped alternating current voltage. Two kinds of partial discharge detection techniques are used, e.g. phase-resolved partial discharge pattern and current pulse waveform analysis. The partial discharge patterns and current pulse waveform are obtained by using a commercial partial discharge measurement...
Low temperature plasma generated by dielectric barrier discharge (DBD) has been paid more and more attention in recent years for its wide range of potential applications. In this paper, atmospheric argon DBD is ignited in a small gas gap of 0.1mm between two parallel glass plates covered by circular copper electrodes with a radius of 0.7 mm. A two-dimension axisymmetric numeric model, coupled with...
Dielectric barrier discharge (DBD) under atmospheric pressure is usually characterized with a large number of streamer discharge filaments. So its applications are greatly limited due to the non-uniform discharge mode. Nowadays, most research efforts are being focused on how to achieve the uniform DBD, and results show that there are many ways to improve the non-uniformity of the discharge, one of...
Previous researches have certified that diffuse plasma can be generated in some mixture gas gap between needle and plate, which may have potential application in biomedicine, film surface modification etc. In this paper, a self-consistent, multiple species, two-dimension numerical model, based on hydromechanics and electric Poisson's equation, is established to study the properties of gas-mixture...
Polymeric materials such as polypropylene films are widely used in electrical and electronic devices because of their good mechanical, chemical, and electrical insulation properties. The electrical behavior subjected to high electric-field and possible breakdown phenomena are of great practical interest. For high-voltage electrical equipment, insulation defects such as pointed end are unavoidable...
To improve impregnating property of Polypropylene film, surface modification of Polypropylene film with dielectric barrier corona discharge in atmospheric pressure is carried out in this paper. A dielectric barrier corona discharge (DBCD) generator is designed and employed for surface modification. The Electrical properties of DBCD, surface analyses of Polypropylene films including chemical components,...
The electrical behavior of dielectric liquids such as transformer oil subjected to high electric-field and the possible breakdown phenomena is of great practical interest, since this liquid has been widely used in high-voltage power apparatus and pulse power systems, accordingly has led to extensive research work. This paper presents streamer discharge process such as initiation and propagation until...
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