Abstract
The cap and pin insulator string, though a simple element in a power system, has the responsibility of carrying the live conductor while insulating it properly from the tower arm. In properly designing the insulator string, it will be necessary to assess the voltage distribution along it to ensure that no unit will get unduly stressed beyond its capacity. There are standard methods available to determine the voltage distribution along an insulator string. However, all these methods have limitations. This paper describes a novel method for accurately computing the voltage distribution along a string insulator which can be used for either short or long strings with no restrictions whatsoever. The computation allows to accommodate the capacitance between the metal work of the string and the tower and the capacitance between the metal cap of the string and the guard ring. The paper also describes two new simple equations that can be used to determine the voltage distribution along an insulator string irrespective of whether it is short or long.
Highlights
A high voltage line conductor is usually supported at the transmission tower arm by a string of suspension insulators
Even though the insulator units are identical, the voltage distribution along the string will not be uniform. This is due to the capacitance effect between the metal work of the insulator units and the steel tower or arm and, to a lesser extent, due to the capacitance effect between the metal cap and the guard ring provided at the connection of the line conductor and the lowest insulator unit
In the design of an insulator string, it is necessary to know how the voltage will be distributed among the several insulator units, when the line conductor has been charged to a particular voltage
Summary
A high voltage line conductor is usually supported at the transmission tower arm by a string of suspension insulators. The string holds the conductor mechanically and insulates it from the tower arm. It is formed by arranging in series, several standard cap and pin suspension insulator units or discs. In the design of an insulator string, it is necessary to know how the voltage will be distributed among the several insulator units, when the line conductor has been charged to a particular voltage. This gives information to the designer to ensure that the units will not get electrically stressed beyond their limits. This paper describes several new methods that can be used to compute the voltage distribution along insulator strings for any voltage and for any number of insulator units in the string
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