NDLI: Investigation of electrification and breakdown strength about transformer oil/pressboard

Content Provider	IET Digital Library
Author	Liu, Daosheng Du, Boxue Yan, Muqiu Wang, Shihui Liu, Xiping
Abstract	Forced convection of insulation oil is the main heat transfer mode in large power and ultra-high voltage (UHV) transformers. The electrification risk caused by friction between mineral oil and pressboard has been suspected to be responsible for several failures. The electrification measurement was carried out in a rotation system. The influences of the oil temperature, rotation speed, time, and applied electric field of fresh and dry transformer oil have been investigated by a measurement system, respectively. A comparison between these results has been made, and the related theory can be used to explain the physical and chemical processes which take place on the interface between the oil and pressboard. The results from the rotation system indicate that interface charge density increases with the increase of the pressboard thickness, rotation time and speed, but decreases with the increase of the temperature. The electrification phenomenon can lead to reduction of the oil/pressboard breakdown strength. It is concluded that some effective measures should be taken to restrain the possible harm caused by the streaming electrification in UHV converter transformer.
Starting Page	386
Ending Page	392
Page Count	7
ISSN	17518660
Volume Number	11
e-ISSN	17518679
Issue Number	Issue 3, Mar (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/11/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2016.0706
Journal	IET Electric Power Applications
Publisher Date	2017-03-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Breakdown Strength Electric Breakdown Electrification Phenomenon Electrification Strength Interface Charge Density Organic Insulation Power Transformer Insulation Pressboard Breakdown Strength Reduction Pressboard Thickness Rotation System Rotation Time Transformer And Reactors Transformer Oil Transformer Pressboard UHV Converter Transformer
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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Effects of multiple parameters on static electrification and breakdown strength of transformer oil

Influence of oil-flow to the breakdown characteristics of oil-pressboard insulation in converter transformer under compound electrical field

Influence of moisture on the interface charge of oil–pressboard composite insulation under DC voltage

Electric field homogenization for converter transformer with nano modified pressboard

Experimental investigation of the effect of the design parameters of pressboard in mineral oil on creepage discharge propagation

Flow electrification characteristics of typical plane oil-pressboard insulation under AC/DC voltage

Oil electrification measured on a pressboard coming from a damaged power transformer

Effect of nanoparticles on electrical characteristics of transformer oil-based nanofluids impregnated pressboard

Effect of ageing on the impulse breakdown strength of oil-impregnated pressboard used in power transformers

Investigation of electrification and breakdown strength about transformer oil/pressboard

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Effects of multiple parameters on static electrification and breakdown strength of transformer oil

Influence of oil-flow to the breakdown characteristics of oil-pressboard insulation in converter transformer under compound electrical field

Influence of moisture on the interface charge of oil–pressboard composite insulation under DC voltage

Electric field homogenization for converter transformer with nano modified pressboard

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