Impulse characteristics of 24 kV overhead line pin insulators

Author

Taklaja, P. ; Hyvonen, P. ; Niitsoo, J. ; Palu, I. ; Kluss, J.

Author_Institution

Dept. of Electr. Power Eng., Tallinn Univ. of Technol., Tallinn, Estonia

fYear

2013

fDate

5-8 May 2013

Firstpage

545

Lastpage

549

Abstract

One of the main characteristics of the distribution grid is the reliability of medium voltage overhead lines which can be improved by appropriate insulation coordination. This paper assesses common insulator types in Estonia. Old glass pin insulators and newly installed porcelain pin insulators were tested against different lightning overvoltages (impulse flashovers) in order to determine their volt-time characteristics. Test results show convincingly that the new porcelain pin insulators can be easily physically broken when stressed by lightning impulses. This can lead to the numeral increase of outages in medium voltage overhead lines in the distribution grid.

Keywords

flashover; glass; impulse testing; insulation co-ordination; insulator testing; lightning; overvoltage; porcelain insulators; power distribution lines; power distribution reliability; power grids; power overhead lines; Estonia; distribution grid; insulation coordination; lightning impulse stress flashover; lightning overvoltage; medium voltage overhead line pin insulator; old glass pin insulator; porcelain pin insulator; reliability; volt-time characteristics; voltage 24 kV; Flashover; Glass; Insulators; Lightning; Porcelain; Reliability; Surges; Insulator; breakdown; flashover; lightning stroke; volt-time characteristic;

fLanguage

English

Publisher

ieee

Conference_Titel

Environment and Electrical Engineering (EEEIC), 2013 12th International Conference on

Conference_Location

Wroclaw

Print_ISBN

978-1-4673-3060-2

Type

conf

DOI

10.1109/EEEIC.2013.6549575

Filename

6549575