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Perfluorocyclobutance (c-C4F8) is a potential alternative insulating gas to SF6. It is nontoxic and has lower global warming potential (GWP) compared with SF6. Because of the high boiling point, the c-C4F8 and N2 mixture gas has been suggested as a replacement to SF6 in gas insulated switchgear (GIS). However, the synergistic effect of c-C4F8/N2 under lightning impulse is seldom researched. This paper...
With the wide application of high voltage and ultra-high voltage cross-linked polyethylene (XLPE) insulated cables and the increasing demand for operation stability, development of XLPE insulation materials with high dielectric strength has become one of the most popular research topics in recent years. In this paper, acetophenone/polyethylene (PE) composites with different contents of acetophenone...
Shielding effectiveness test is a typical application of nanosecond high voltage pulse. A Compact High Power Pulsed Simulator for the shielding effectiveness is developed. To obtain fast rise time of pulse voltage, a switch has to have low inductance. A liquid gap switch has this property. This switch operates with fixed anode, cathode and a removable trigger electrode. The switch gap is filled with...
The aging problem of material of composite insulators is one of key issues for power utilities. The most commonly used methods for aging evaluation are observation method, HC water spray classification method and static contact angle method and so on. However, there some subjective factor would be introduced by the operator of those methods. In order to investigate the aging state more objective,...
With an increase in usage amount and operating years of composite insulators, their failures caused by aging increased in number. The 110kV composite insulators in service were studied in this paper, and the electric field distribution along the axial direction of the insulator was calculated by using ANSYS software, which is based on the finite element method (FEM). According to the simulated results,...
The distributed circuit parameters of three kinds of chamfered bent microstrip lines are extracted and analyzed. In the implementation, the distributed voltage and current on the transmission lines are calculated first by the conformal finite differential time domain method (CFDTD). Then, the distributed circuit parameters are obtained by substituting the distributed voltage and current into the generalized...
Numerical simulations of SAR induced in vehicle occupants due to on-board radio transmissions have been used to investigate possible approaches for assessing compliance with electromagnetic field exposure recommendations. The simulations employed 3D numerical models based on real vehicle geometry and human simulants of realistic size and shape. Results have been obtained for transmissions from a number...
Numerical simulation has been carried out to assess the effects of different source antenna locations on electric field distribution within a vehicle cabin at 2400 MHz. Only fixed onboard antennas mounted within the vehicle cabin are considered. The car model contains only metallic parts and ignores dielectric furnishings. Localised electric field visualizations within the vehicle cabin are obtained...
The electromagnetic environment of the High Voltage Direct Current (HVDC) is much more complex than ever, main protection plus backup protection with tradition meaning are limited. The EMC of the PCB in the secondary equipments is top priority. In this paper Finite Integration Theory (FIT) method was applied to the analysis the resisting EMI of the PCB in high frequency. The model bases of the real...
The electromagnetic environment of the high voltage direct current (HVDC) is much more complex than ever. The electromagnetic compatibility (EMC) of the printed circuit board (PCB) in the secondary equipments is the top priority. In this paper, finite integration theory (FIT) methods are applied to analyse the resisting electro magnetic interference (EMI) of the PCB in high frequency. The model bases...
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