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The transient electric field distribution under lightning impulse voltage (LIV) is vital to the reliability of 750 kV composite cross-arm. However, the transient electric field of electrical equipment under impulse voltage has usually been substituted by the equivalent sinusoidal voltage, without considering the variation of permittivity with frequency. Using the frequency decomposition computation...
The molten contact surfaces, which are caused by interrupting high currents in a vacuum interrupter (VI), can be induced to form Taylor cones by electrostatic force after current zero. Moreover, the deformation caused by the Taylor cones can further enhance the local electric field at their tips, which lead to breakdowns during post-arc phases, and make the interruptions fail. The objective of this...
Owing to its complex structure, high electric field strength, the rigid jumper on 1000kV double circuit tension tower is prone to corona that needs suppression and much more consideration. Using three dimensional finite element method software ANSYS, the electric field distribution on the surface of rigid jumper with aluminum tube structure was calculated when considering the effect of tower, fittings,...
Ultra high voltage (UHV) AC Gas Insulated Switchgear (GIS) spacer is one of the most important components in GIS. In the process of long-term operation, partial discharge often occurs at the interface between the center conductor and epoxy resin (EP) basin body if this interface has some defects, and the discharge sometimes even leads to the crack of basin. It has become a bottleneck for the safe...
UHV AC GIS spacer is the critical component of gas insulated switchgear (GIS) in UHV substation. It plays a supporting conductor, isolating chamber and electrical insulation role. Defects of GIS spacer like delamination, metallic particles, protrusions will be introduced during manufacturing, installation, operating process, etc. These defects will worsen electrical field distribution and degrade...
Transient process takes place when a rapidly changing excitation is imposed on a insulation system, like lightening impulse voltage, polarity reversal voltage, et al. In previous studies transient electric field is calculated considering the relative permittivity as a constant. However, a fast changing excitation contains many high frequency harmonic components under which the permittivity may become...
Silicone rubber makes composite insulators show excellent moisture dirt performance because of its hydrophobicity. In the wet environment, separated water droplets instead of continuous water film will form on the surface of composite insulators, helping curb the occurrence of arc in high-strength field. However, separated water droplets will distort the electric field easily leading to the partial...
During the operation of a HVAC bushing, there exists E-field distortion at the edge of the aluminum foils where the edge effect enhances E-field. To figure out the operating performance of a bushing, it's essential to analyze the distribution of E-field at the edge of foils. In this paper, computing and experimental researches are conducted to analyze the edge effect. We first investigate a 2-D model...
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