Lifetime extension of medium voltage cables

Alexander Pirker, Rudolf Woschitz, Herbert Steuerer, Martin Hesse

Publikation: KonferenzbeitragPaperForschungBegutachtung

Abstract

In many Austrian distribution grids PE-insulated medium voltage cables installed in the 1980’s are still in service. Failures caused by water-trees in the insulation are well known and reported. For grid operators this raises the question of whether to replace the cables to maintain the reliability of the grid.
Another possibility instead of replacing the cables is to extend the service life of PE-insulated cables using a treatment to refit the insulation. This treatment uses a silicon based fluid which is pressed into the insulation of the cable to inactivate existing water trees. Initially cables were treated using a fluid containing phenylmethyl-dimethyloxysilane components. These components often caused accelerated corrosion of aluminium conductors because of chemical reactions in the past. Due to this fact a couple of years ago the fluid was improved using dialkoxysilane to prevent corrosion. The effectiveness of this improved method for life time extension of medium voltage cables has been investigated in a cooperation of the Austrian Netz Burgenland Strom GmbH, the German UtilX Europe GmbH and the Institute of High Voltage Engineering and System Performance, Graz University of Technology. Sections of 20 kV cables were used for investigating this insulation refit. An impulse voltage step test has been carried out on these and on refitted samples to evaluate the effect of the treatment.
Originalspracheenglisch
Seitenumfang3
PublikationsstatusVeröffentlicht - 21 Jun 2015
VeranstaltungInternational Conference on Insulated Power Cables - Versailles - Paris, Frankreich
Dauer: 21 Jun 201525 Jun 2015

Konferenz

KonferenzInternational Conference on Insulated Power Cables
LandFrankreich
OrtVersailles - Paris
Zeitraum21/06/1525/06/15

Fingerprint

Cables
Electric potential
Insulation
Fluids
Corrosion
Service life
Water
Chemical reactions
Aluminum
Silicon

Fields of Expertise

  • Sonstiges

Treatment code (Nähere Zuordnung)

  • Experimental

Dies zitieren

Pirker, A., Woschitz, R., Steuerer, H., & Hesse, M. (2015). Lifetime extension of medium voltage cables. Beitrag in International Conference on Insulated Power Cables, Versailles - Paris, Frankreich.

Lifetime extension of medium voltage cables. / Pirker, Alexander; Woschitz, Rudolf; Steuerer, Herbert; Hesse, Martin.

2015. Beitrag in International Conference on Insulated Power Cables, Versailles - Paris, Frankreich.

Publikation: KonferenzbeitragPaperForschungBegutachtung

Pirker, A, Woschitz, R, Steuerer, H & Hesse, M 2015, 'Lifetime extension of medium voltage cables' Beitrag in, Versailles - Paris, Frankreich, 21/06/15 - 25/06/15, .
Pirker A, Woschitz R, Steuerer H, Hesse M. Lifetime extension of medium voltage cables. 2015. Beitrag in International Conference on Insulated Power Cables, Versailles - Paris, Frankreich.
Pirker, Alexander ; Woschitz, Rudolf ; Steuerer, Herbert ; Hesse, Martin. / Lifetime extension of medium voltage cables. Beitrag in International Conference on Insulated Power Cables, Versailles - Paris, Frankreich.3 S.
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N2 - In many Austrian distribution grids PE-insulated medium voltage cables installed in the 1980’s are still in service. Failures caused by water-trees in the insulation are well known and reported. For grid operators this raises the question of whether to replace the cables to maintain the reliability of the grid. Another possibility instead of replacing the cables is to extend the service life of PE-insulated cables using a treatment to refit the insulation. This treatment uses a silicon based fluid which is pressed into the insulation of the cable to inactivate existing water trees. Initially cables were treated using a fluid containing phenylmethyl-dimethyloxysilane components. These components often caused accelerated corrosion of aluminium conductors because of chemical reactions in the past. Due to this fact a couple of years ago the fluid was improved using dialkoxysilane to prevent corrosion. The effectiveness of this improved method for life time extension of medium voltage cables has been investigated in a cooperation of the Austrian Netz Burgenland Strom GmbH, the German UtilX Europe GmbH and the Institute of High Voltage Engineering and System Performance, Graz University of Technology. Sections of 20 kV cables were used for investigating this insulation refit. An impulse voltage step test has been carried out on these and on refitted samples to evaluate the effect of the treatment.

AB - In many Austrian distribution grids PE-insulated medium voltage cables installed in the 1980’s are still in service. Failures caused by water-trees in the insulation are well known and reported. For grid operators this raises the question of whether to replace the cables to maintain the reliability of the grid. Another possibility instead of replacing the cables is to extend the service life of PE-insulated cables using a treatment to refit the insulation. This treatment uses a silicon based fluid which is pressed into the insulation of the cable to inactivate existing water trees. Initially cables were treated using a fluid containing phenylmethyl-dimethyloxysilane components. These components often caused accelerated corrosion of aluminium conductors because of chemical reactions in the past. Due to this fact a couple of years ago the fluid was improved using dialkoxysilane to prevent corrosion. The effectiveness of this improved method for life time extension of medium voltage cables has been investigated in a cooperation of the Austrian Netz Burgenland Strom GmbH, the German UtilX Europe GmbH and the Institute of High Voltage Engineering and System Performance, Graz University of Technology. Sections of 20 kV cables were used for investigating this insulation refit. An impulse voltage step test has been carried out on these and on refitted samples to evaluate the effect of the treatment.

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