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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
Vise andre og tillknytning
2017 (engelsk)Inngår i: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 17, nr 3, s. 1402-1408Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
American Chemical Society (ACS), 2017. Vol. 17, nr 3, s. 1402-1408
Emneord [en]
Electrical tree, ptychography, DC-tree, HVDC, polyethylene
HSV kategori
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
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QC 20170329

Tilgjengelig fra: 2017-03-29 Laget: 2017-03-29 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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

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