Download Abstract- mechanical support for High voltage conductors in addition to withstand... result of lightning, switching or temporary over voltages that could...

Simulation of Potential and Electric Field across Faulty Ceramic Disc Insulator String
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Wednesday, 03 October 2012 04:44 - Last Updated Monday, 08 April 2013 14:27
Abstract- Ceramic/Porcelain insulators are widely used in power transmission lines to provide
mechanical support for High voltage conductors in addition to withstand electrical stresses. As a
result of lightning, switching or temporary over voltages that could initiate flashover under worst
weather conditions, and to operate within interference limits. Given that the useful life in service
of the individual insulator elements making up the insulator strings is hard to predict, they must
be verified periodically to ensure that adequate line reliability is maintained at all times. Over the
years utilities have adopted few methods to detect defective discs in a string, subsequently
replacement of the faulty discs are being carried out for smooth operation. But, if the insulator is
found to be defective in a string at some location that may not create any changes in the field
configuration, there is no need to replace to avoid manpower and cost of replacement. Due to
deficiency of electric field data for the existing string configuration, utilities are forced to replace
the discs which may not be essentially required. Hence, effort is made in the present work to
simulate the potential and electric field along the normal and with faults induced discs in a string
up to 765 kV system voltages using Surface Charge Simulation Method (SCSM). A comparison
is made between simulated results, experimental and field data and it was found that the
computed results are quite acceptable and useful. Keywords- Ceramic/ porcelain Insulators, Defective insulator disc, Surface Charge Simulation
Method
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