Original scientific paper

Influence of cable lengths on power transformers protection

Jesús Bernal ; Iberdrola

Abstract

The aim of this research article is to determine the way to install surge arresters close to a power transformer to provide protection against lightning overvoltage. Depending on the length of the cables used in the installation, the insulation levels in base insulators of surge arresters and bushings of transformers change according to the voltage they support. For validation purposes, the voltage at base insulators and bushings has been analysed for different cable lengths in a typical substation. The results obtained from the simulations conducted with the ATP-EMTP software show the maximum lengths that cannot be exceeded for each insulation level selected for base insulators and bushings in case of a 145 kV power transformer.

Keywords

overvoltage; insulated cables; surge arresters; base insulators; transformer bushings

Hrčak ID:

182744

URI

https://hrcak.srce.hr/182744

Publication date:

8.7.2015.

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