Electric field grading using insulators with microvaristor filled silicon rubber

Author

Schulte-Fischedick, J. ; Lehretz, Fabian ; Denndorfer, Heinz ; Seifert, Joachim ; Debus, Jurgen ; Hinrichsen, Volker ; Hanyu Ye ; Clemens, Markus ; Bornowski, Markus

Author_Institution

Lapp Insulators GmbH, Wunsiedel, Germany

fYear

2013

fDate

June 30 2013-July 4 2013

Firstpage

226

Lastpage

229

Abstract

The lifetime of insulators for Ultra High Voltage Overhead Transmission Lines (UHV OHTL) for voltages of 765 kV or 1100 kV is currently restricted to limited years due to unknown effects regarding the onset of streamer discharge. To overcome this limit special insulators are developed that incorporate a microvaristor layer thus restricting the peak field strength to 0.5 kV/mm (according to the switching point to be determined by the microvaristor microstructure). In this paper the current status including most recent FEM modelling and HV laboratory test results is presented. This resulted in the development of a prototypical design to be tested in a forthcoming field test.

Keywords

electric fields; insulators; power overhead lines; varistors; FEM modelling; HV laboratory test; UHV OHTL; electric field grading; insulators; microvaristor filled silicon rubber; microvaristor layer; microvaristor microstructure; peak field strength; streamer discharge; ultra high voltage overhead transmission lines; Conferences; Electric fields; Finite element analysis; Materials; Rubber; Switches; μ-varistors; composite insulators; electric field grading; streamer discharge;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid Dielectrics (ICSD), 2013 IEEE International Conference on

Conference_Location

Bologna

ISSN

2159-1687

Print_ISBN

978-1-4799-0807-3

Type

conf

DOI

10.1109/ICSD.2013.6619780

Filename

6619780