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This paper studies the charge distribution on the transmission line glass insulator surfaces under two different ac voltages viz. 28 kV and 33 kV. A string of four insulator units under dry and clean conditions is taken as the main research object. An attempt to capture the accumulated charge has been made by using radially shaped stainless steel mesh placed axially at a distance of 2 cm from each...
Irregularity in charge distribution of an insulator may lead to accelerated aging and electrical breakdown. However, knowledge of charge distribution on the insulation surface is still insufficient albeit has gained worldwide attention. The insufficiency is particularly on the charge profile along the string insulator under AC excitation. Therefore, charges distributions on the surfaces of glass insulators...
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...
This paper reports an investigation carried out in the laboratory on units of transmission line glass insulator samples using Dielectric Dissipation Factor (DDF) Test. Two groups of insulator samples were used in the study. The first group comprised of naturally field-aged insulators with different ageing periods→30, 20, 15, and >;10 years from a 132 kV transmission line which have exhibited different...
This paper reports an investigation carried out in the laboratory on 45 units of glass insulator samples. The insulator units comprise of 5 groups; new and field-aged insulators with different ageing period (>30, 20, 15 and <10 years) from 132 kV transmission line. The results revealed a correlation between the ratio of the 3rd and 5th harmonic amplitudes with the degree of degradation of the...
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