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One of the most challenging design aspects of high voltage equipment is to ensure adequate electrical field distribution and controlled magnitudes within the insulation regions of the equipment to ensure integrity and long term satisfactory in-service performance. Electrode geometry can be designed to improve distribution and lower peak magnitudes of electrical fields. However, this is not sufficient...
Overhead transmission line insulators are designed to perform dual functions namely electrical protection and mechanical support. However, irregular distribution of voltage and electric-field in the insulators may lead to corona, partial discharge, premature aging and indeed flashover. An attempt has been made with finite element software to calculate the voltage and electric-field distribution in...
Lightning induces voltage on a horizontally suspended conductor due to electromagnetic field coupling. If the induced voltage is measured across a matched impedance at both ends, it may be possible to locate the distance and angle of incidence of the lightning. Researches on lightning induced voltages mainly focus on its effect to insulation across the conductor and ground. The situation is modeled...
Most power utilities are keen to replace high voltage paper insulated cables with XLPE insulated cables. However XLPE cables are prone to insulation degradation due to water treeing. In Malaysia, due to industrial pollution and soil salinity, they become sources of treat to XLPE cable performance. This paper describes the study of the effects of water acidity levels and salinity on the growth of bow-tie...
In this paper, the effect of lightning on a gas pipelines is investigated. The metallic pipelines were modelled as a short transmission line of PI-circuit model. A switch is represented as a pair of sphere-gaps and is used to model side-flash and insulation breakdown of air. The lightning strike leader is represented by a simple high current source generation with DC source and other elements. Results...
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