Back to Search
Start Over
The Development of Electrical Tree Discharge in Epoxy Resin Impregnated Paper Insulation
- Source :
- IEEE Access, Vol 8, Pp 69522-69531 (2020)
- Publication Year :
- 2020
- Publisher :
- IEEE, 2020.
-
Abstract
- An electrical tree discharge model of multilayer insulation paper was prepared, and a voltage of 20 kV was used for electrical tree cultivation and initiation tests. Based on the microscopic image information and partial discharge (PD) information during the aging of the electrical tree, the development of electrical tree discharges between layers of paper comprising epoxy resin-impregnated paper insulation was studied. The results show that, by analysing PD information such as the discharge volume phase spectrum and the discharge repetition rate phase spectrum, the development of the electrical tree branch progresses in four stages: initial, growth, stagnation, and bursting. During the growth and stagnation stages, the main discharge paths of the electrical tree are mainly formed, and there are many filamentous fibres on the path edge. During the burst stage, more branches will be formed on the electrical tree, which will cause the greatest damage to the insulation. With the extension of the electrical tree path, the discharge magnitude and discharge times also increase. There are specific discharge patterns in different growth stages of the electrical tree, and the number of discharge events in each positive half-cycle is significantly greater than that in a negative half-cycle. Combining the microscopic image information and PD information during the aging of such an electrical tree, a theoretical basis for evaluating insulation state by PD monitoring is realised. The long-chain molecules of cellulose and epoxy resin break bonds and oxidise, which decompose into a large number of free radicals, monosaccharides, and other low-molecular-weight products.
- Subjects :
- Imagination
Materials science
Chemical substance
General Computer Science
epoxy resin-impregnated paper
media_common.quotation_subject
02 engineering and technology
micromorphology
010402 general chemistry
01 natural sciences
Partial discharge
General Materials Science
Composite material
media_common
General Engineering
Fourier transform infrared spectroscopy
Epoxy
021001 nanoscience & nanotechnology
0104 chemical sciences
Tree (data structure)
Volume (thermodynamics)
visual_art
visual_art.visual_art_medium
Stage (hydrology)
lcsh:Electrical engineering. Electronics. Nuclear engineering
growth characteristics
0210 nano-technology
lcsh:TK1-9971
electrical tree
Voltage
Subjects
Details
- Language :
- English
- ISSN :
- 21693536
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- IEEE Access
- Accession number :
- edsair.doi.dedup.....6829cfe18dc125c9fa49194819fa4057