Partial discharge (PD) is a common and detrimental phenomenon that can cause damage, and eventual breakdown for insulation systems. Currently there are several standards for PD detection and measurement at atmospheric pressure, with power frequency (up to 400 Hz) excitation voltage. In a gaseous medium, such as air, the partial discharge inception voltage (PDIV) will generally decrease with...
As the power demands increase for airplanes, heavy duty electric vehicles and data centers, their dc bus voltages are expected to increase. While this reduces cable weight and improves system efficiency, electric arcs become an increasingly dangerous fault condition. Arcs fall under two categories—in series or in parallel with a load. Parallel arcs release large amounts of energy as high and...
It has been ascertained already, without doubts, that feeding rotating machines by power electronics drives can cause accelerated degradation and premature breakdown of electrical insulation. This is due to various factors, but the predominant one is the inception of partial discharges, PD, which are not expected to occur in Type I (organic) insulation, or the abnormal growth of PD (in...
In recent years, with the development of higher voltage and larger capacity of electrical equipment, the improvements of electrical insulation performance for various materials are urgent. The present investigations indicate that the characteristics of material surface, such as adhesion, hydrophilicity, charge accumulation, hardness, can be enhanced by surface modification including direct...
Pulsed plasma jet with the advantages of compact size, low coat, abundant reactive species and flexibility have been a hot spot in recent years. The application of pulsed plasma including surface modification, medical application and environmental protection, etc. Especially, by grouping individual plasma jets together, large area and abnormal shape subjects can be easily treated. In this...
Guan-Jun Zhang, Run-Dong Zhou, Guang-Yu Sun, Bao-Hong Guo, Bai-Peng Song, Zheng-Shi Chang, Hai-Bao Mu
State Key Laboratory of Electrical Insulation and Power Equipment,
School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
Surface flashover across solid insulation in vacuum is a great limitation of many electrical and electronic systems, since it typically...
The plasma electrons bombarding a plasma-facing wall surface can induce secondary electron emission (SEE) from the wall. A strong SEE can enhance the power losses by reducing the wall sheath potential and thereby increasing the electron flux from the plasma to the wall. The use of the materials with surface roughness and the engineered materials with surface architecture is known to reduce the...
