NDLI: Self-healing high voltage electrical insulation materials

Content Provider	IEEE Xplore Digital Library
Author	Lesaint, C. Risinggard, V. Hølto, J. Saeternes, H.H. Hestad, Ø. Hvidsten, S. Glomm, W.R.
Copyright Year	2014
Description	Author affiliation: Energy Res., Sintef, Trondheim, Norway (Lesaint, C.; Risinggard, V.; Hølto, J.; Saeternes, H.H.; Hestad, Ø.; Hvidsten, S.) \|\| Mater. & Chem., Sintef, Trondheim, Norway (Glomm, W.R.)
Abstract	Electrical treeing can be the precursor to catastrophic failure for electrical insulation materials and hence significantly shorten their service lifetime. Considering that damage inside the composites (thermoset insulation materials containing fillers) is difficult to detect and particularly to repair, the ability to self-heal as a direct response to electrical degradation is very attractive, especially in challenging environments. The approach presented in this paper for development of self-healing thermoset electrical insulation materials is derived from a technology developed by White et al. in 2001, intended to halt mechanical degradation of the material: Microcapsules filled with a monomer (healing agent) are added to the insulation materials (epoxy) prior to casting. When cracks propagate in the material the microcapsules will rupture, releasing liquid healing agent into the crack. The final step of the self-healing process is the polymerization of the monomer, which occurs upon contact with a catalyst also added to the epoxy resin. Electrical degradation by electrical treeing has many similarities with mechanical cracking of the material. For a system containing microcapsules, one or more of the branches of the electrical tree will likely break a capsule, filling the electrical tree with the liquid monomer. As the tree structure is interconnected, most of the tree structure is likely to be filled. This depends on the partial pressure and viscosity of the monomer and the surface tension of the hollow tubes, but also on the availability of monomer relative to the dimensions of the hollow tubes. The filling itself should extinguish critical discharges, making further growth less likely. Upon polymerization, further development of the electrical tree should halt, or at least be significantly delayed. A series of tests, where high voltage was applied to metal needles cast in epoxy to induce electrical tree growth, was conducted to study electrical degradation and breakdown of the thermoset insulation with and without microcapsules with monomer (healing agent). The experimental setup used provides the possibility of studying the inception and propagation of the phenomena using an optical microscope. This setup was used to study the interaction between the electrical tree and the micro-capsules in situ, and showed the direct attraction of the electrical trees towards the microcapsules.
Sponsorship	IEEE Dielectr. Electr. Insul. Soc.
Starting Page	241
Ending Page	244
File Size	932358
Page Count	4
File Format	PDF
ISBN	9781479927876
e-ISBN	9781479927890
DOI	10.1109/EIC.2014.6869384
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Insulation Polymers Degradation Electric breakdown Microscopy Filling microcapsules electrical trees self-healing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

High Voltage Insulation Failure Mechanisms

Effect of copolymerization on electrical and water trees of polyethylene

A model of the electrical breakdown process due to electrical treeing growth

Electrical And Electrochemical Trees In Cable Insulation

D&EI Folks

Final Breakdown Mechanism Of Water Treeing

A Study of Electrical Tree Initiation from Water Tree

Electroluminescence in water-treed XLPE

Microscopic scenarios for implementing a dynamic model of electric breakdown in a solid insulation system

Self-healing high voltage electrical insulation materials

Similar Documents

High Voltage Insulation Failure Mechanisms

Effect of copolymerization on electrical and water trees of polyethylene

A model of the electrical breakdown process due to electrical treeing growth

Electrical And Electrochemical Trees In Cable Insulation

D&EI Folks

Final Breakdown Mechanism Of Water Treeing

A Study of Electrical Tree Initiation from Water Tree

Electroluminescence in water-treed XLPE

Microscopic scenarios for implementing a dynamic model of electric breakdown in a solid insulation system

Self-healing high voltage electrical insulation materials