Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Three-Dimensional Nanometer Features of Direct Current Electrical Trees in Low-Density Polyethylene
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.ORCID-id: 0000-0003-4774-4341
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.ORCID-id: 0000-0002-9663-7705
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi.ORCID-id: 0000-0003-2201-2806
Visa övriga samt affilieringar
2017 (Engelska)Ingår i: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 17, nr 3, s. 1402-1408Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Electrical trees are one reason for the breakdown of insulating materials in electrical power systems. An understanding of the growth of electrical trees plays a crucial role in the development of reliable high voltage direct current (HVDC) power grid systems with transmission voltages up to 1 MV. A section that contained an electrical tree in low-density polyethylene (LDPE) has been visualized in three dimensions (3D) with a resolution of 92 nm by X-ray ptychographic tomography. The 3D imaging revealed prechannel-formations with a lower density with the width of a couple of hundred nanometers formed around the main branch of the electrical tree. The prechannel structures were partially connected with the main tree via paths through material with a lower density, proving that the tree had grown in a step-by-step manner via the prestep structures formed in front of the main channels. All the prechannel structures had a size well below the limit of the Paschen law and were thus not formed by partial discharges. Instead, it is suggested that the prechannel structures were formed by electro-mechanical stress and impact ionization, where the former was confirmed by simulations to be a potential explanation with electro-mechanical stress tensors being almost of the same order of magnitude as the short-term modulus of low-density polyethylene.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2017. Vol. 17, nr 3, s. 1402-1408
Nyckelord [en]
Electrical tree, ptychography, DC-tree, HVDC, polyethylene
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-204068DOI: 10.1021/acs.nanolett.6b04303ISI: 000396185800013PubMedID: 28177252Scopus ID: 2-s2.0-85014927866OAI: oai:DiVA.org:kth-204068DiVA, id: diva2:1085510
Anmärkning

QC 20170329

Tillgänglig från: 2017-03-29 Skapad: 2017-03-29 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextPubMedScopus

Personposter BETA

Pallon, Love K. H.Yu, ShunHedenqvist, Mikael S.

Sök vidare i DiVA

Av författaren/redaktören
Pallon, Love K. H.Nilsson, FritjofYu, ShunLiu, DongmingHedenqvist, Mikael S.Olsson, Richard T.Gedde, Ulf W.
Av organisationen
Fiber- och polymerteknologi
I samma tidskrift
Nano letters (Print)
Kemi

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
pubmed
urn-nbn

Altmetricpoäng

doi
pubmed
urn-nbn
Totalt: 101 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf