Experimental investigation on flashover performance of glass insulator for DC transmission lines at high altitudes

2007 ◽  
Author(s):  
Fuzeng Zhang ◽  
Yingke Mao ◽  
Xin Wang ◽  
Liming Wang ◽  
Zhicheng Guan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Transmission Lines ◽  
High Altitudes ◽  
Glass Insulator

scholarly journals Proposal of a dynamic numerical approach in predicting flashover critical voltage

2019 ◽  
Vol 10 (2) ◽  
pp. 602 ◽  
Author(s):  
Ali. A. Salem ◽  
R. Abd-Rahman ◽  
M. S. Kamarudin ◽  
H. Ahmad ◽  
N.A.M. Jamail ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Thermal Stresses ◽  
Numerical Approach ◽  
Critical Voltage ◽  
Arc Length ◽  
Severe Condition ◽  
The World ◽  
Glass Insulator ◽  
Experimental Works ◽  
Good Agreement

<span lang="EN-US">Glass insulators, due to its diverse characteristics, were used widely around the world for high voltage transmission lines. Surfaces of the insulators are exposed to high electrical, mechanical, and thermal stresses over the period of service. Accumulation of contamination distort stresses distribution along the insulators that may lead to flashover under severe condition. In this paper, Obenaus pollution model has been adopted to propose a dynamic mathematical modelling to determine flashover critical voltage with regard to parameters such as pollution conductivity, arc length, and width of layer of contamination on the surface of glass insulator. In addition, laboratory experimental works have been carried out according to IEC60305 to validate the results from numerical approach, which indicate a good agreement.</span>

Leakage Current Based Thermal Modeling of Glass Disc Insulator Surface

2017 ◽  
Vol 6 (3) ◽  
pp. 504
Author(s):  
Mohammed Imran Mousa ◽  
Zulkurnain Abdul-Malek ◽  
Zainab Imran Mousa
Keyword(s):  
Transmission Lines ◽  
Comsol Multiphysics ◽  
Insulator Surface ◽  
Glass Disc ◽  
Element Simulation ◽  
Glass Insulation ◽  
Glass Insulator ◽  
Dependent Model ◽  
The Stability ◽  
Time Dependent Model

The stability of transmission lines relies on the health of the insulators, such as glass string insulators, which may occasionally flashover during an overvoltage. The likelihood of flashover increases notably when the glass insulator is wrapped by a wet contaminant layer. In this paper a study of the surface thermal profile of glass disc insulators insulation had been carried out for both clean and polluted surfaces. A finite-element simulation with time dependent model was carried out using COMSOL Multiphysics software. The variation of the insulator surface temperature with applied voltage as well as with pollution layer thickness is explained. The results illustrate the significant effect of pollution conductivity on heat propagate along the surface of the glass insulators with the increase higher voltages' magnitudes. Study of the aging level impact on a steady state thermal for glass insulation surface is also carried out.

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