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In the presence of void in cable insulation, repetition of partial discharge (PD) occurrences is one of the main sources of insulation degradation, which may lead to complete breakdown. Therefore, it is important to monitor the condition of cable insulation through PD measurement. Replicating PD measurement on a test object with the presence of a void within cable insulation may help a better understanding...
First generation gas insulated switchgears were constructed with large safety margin. Today's trend is to reduce the size of the switchgears to save material and costs. With increased field strength due to reduced dimensions as well as increased pressure in the compartments, the influence of surface roughness, surface damages and conducting particles is increasing. Therefore the knowledge of the exact...
Ester oils are making their way into the transformer market, but still some doubts exist about their ability to be successful fluids for high and extra-high voltage transformers. In this paper, we compare the PDIV of two commercially available fluids: a natural ester and mineral oil. Two different setups were considered: Point to plane in oil and point to plane on a pressboard sheet immersed in oil...
Due to the geometry configure of composite insulator, the electric field strength near the two ends of composite insulator is always strong. The high electric field strength can cause the partial discharge on the insulation material and the surface of the metal electrodes, and bring premature aging of the insulator. In this paper, a new optimization method on the electric field distribution of composite...
In gas insulated switchgears (GIS), high voltage electrodes are supported by solid insulators. A "triple junction" (TJ) exists at the interface between metal, insulating solid, and gas. This area constitutes a preferential zone were partial discharges (PDs) can appear. A further degradation of insulation performance can occur if solid particles accumulate at that place. This paper presents...
Summary form only given. Asymmetric double (both electrodes insulated) and single (one electrode insulated) surface barrier discharges' are investigated. Both geometries used one wire electrode and one copper tape electrode. The discharges are driven by 1 kHz symmetric triangle waveforms. Time- and space- resolved light emissions are recorded by an intensified charge-coupled device (ICCD) camera,...
Two parameters which mainly affect the performance of Plasma Display Panels (PDPs) are electrode and rib geometries of the PDP cell. T-shaped electrode geometry leads to slightly higher efficacy in comparison with conventional coplanar electrodes geometry because of extending the discharge path. This allows more uniform illumination of the phosphors by the vacuum ultraviolet (VUV) photons (reduction...
Summary form only given. It is known fact that discharges in spark gaps at high pressure > 10 atm, which are capable of fast switching (less than 1 ns), are widely used for high power pulse generator. In such spark gaps, typical inter electrode distance is larger than several millimeters. We investigated discharges in short inter electrode distances on the order of 100 Icircfrac14m. The reason...
On the one hand, an empirical quadratic relationship between the charge Qi of the first impulse corona and the associated inception voltage Ui has been recently proposed for a 1m point-plane airgap submitted to impulse voltages. On the other hand, different models have been proposed to evaluate that relation for coaxial geometries also submitted to impulse voltages. The aim of this paper is to compare...
Dielectric barrier discharge (DBD) with multi-needle to plane electrodes is attractive for some commercial use, especially air pollution control. The effect of electrodes' configuration on discharge behaviour is remarkable, as well as its applications. However, structural optimization of multi-needle to plane electrodes has not been studied systematically. In this paper, the space between nearby needles...
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