NDLI: Effects of the charge carrier elimination process on oil conductivity decrease under high electric field intensity

Content Provider	IET Digital Library
Author	Yang, Lijun Cheng, Zhidong Cheng, Li Liao, Ruijin
Abstract	The DC conductivity of insulating oil is key to converter transformers, in which AC and DC electrical fields simultaneously exist. Research on the influence of the electric field on oil conductivity can optimise the insulation design of converter transformers. Although numerous studies have been conducted on the conductance mechanism of non-polar liquids, the explicit mechanism and properties of oil conductivity under a high electrical field remain unclear. This study developed an optimised conductance model considering charge carrier elimination, dissociation, and charge injection process. Thereafter, the authors chose three types of oils for converter transformers and measured the variations in oil conductivity and ion mobility under different electric fields with 0–10 kV/mm range. The result indicates that ion mobility will increase under a high electric field owing to the EHD effects. The conductivity of the insulating oil follows a U-shaped pattern with an increasing electric field, thereby generally matching the optimised theoretical model. Therefore, the decrease in conductivity is mainly the result of the elimination process of free ions, whereas the increase is the result of the injection process that occurs on the electrodes.
Starting Page	979
Ending Page	984
Page Count	6
ISSN	17518822
Volume Number	14
e-ISSN	17518830
Issue Number	Issue 10, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/14/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2020.0123
Journal	IET Science, Measurement & Technology
Publisher Date	2021-01-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Electrical Field Charge Carrier Elimination Charge Injection Conductance Mechanism Converter Transformers DC Conductivity DC Electrical Field Dissociation EHD Effects Electric Field Intensity Electrical Conductivity Electrical Conductivity of Insulators Electrode Electrohydrodynamics Insulating Oil Insulating Oils Ion Mobility Nonpolar Liquids Oil Conductivity Organic Insulation
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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