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If you have ever skilled downtime due to a field failure of an ‘epoxy insulator’, the outrageously high cost of downtime could have been avoided by applying porcelain insulators. However, for higher voltage transmission lines, strain insulator consists of an assembly of suspension insulators as shown in Figure.

In this case, the suspension string is arranged horizontally and the insulator discs are in vertical plane. These pieces of glass had been positioned on a tapered wooden pin, vertically extending upwards from the pole’s crossarm (typically only two insulators to a pole and maybe one on top rated of the pole itself).

These shunt capaci­tances, often named the stray capacitances have an vital impact on the voltage distribution amongst the units. A wide assortment of disc suspension insulators options are obtainable to you, such as composite polymer, porcelain, and fiberglass.

The capacitance due to two metal fittings on either side of an insulator is identified as mutual capacitance.
http://www.umek.pro are tested to meet American National Standards Institute (ANSI) specifications. However, for DC voltages, insulator capacitances are ineffective and voltage across every single unit would be the identical.

This clearly shows that disc nearest to the conductor has maximum voltage across it, the voltage across other discs decreasing progressively as the cross arm in approached. In quite a few circumstances of intense pollution, it becomes necessary to wash standard glass and porcelain insulators in order to decrease the risk of flashover.