NDLI: Carrier mobility and trap distribution dependent flashover characteristics of epoxy resin

Content Provider	IET Digital Library
Author	Du, Boxue Du, Qiang Li, Jin Liang, Hucheng
Abstract	Epoxy disc-type spacer, as the major insulator of gas insulated transmission line, plays a significant role in the reliability and safety of the entire power grid. While surface charge accumulation on the spacer could induce flashover and accelerate degradation of the insulator, which threats the operation of high-voltage DC transmission and grid. In this study, a corona discharging system was employed to charge the epoxy samples before the charge dissipation measured, and the surface flashover voltages of samples with different modification time under DC voltage were also measured, the results are obtained from the research. It is found that the carrier mobility and surface flashover voltage of samples are affected by modification time, and maximum value of both can be obtained when the sample is modified for 60 min. Under the combined voltages, the initial surface charge density and carrier mobility are affected by both pulse voltage and modification time. It is indicated that surface modification is an appropriate method which can significantly inhibit the surface charge accumulation, and improve the flashover characteristics of epoxy sample by increasing carrier mobility. The trap distribution characteristics suggested that the modification treatment and charging condition have a significant effect on the depth and density of trap.
Starting Page	466
Ending Page	471
Page Count	6
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 2, Jan (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.0984
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-09-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Carrier Mobility Charge Dissipation Corona Discharging System D.C. Transmission Dielectric Breakdown And Discharges Epoxy Disc-type Spacer Epoxy Insulation Epoxy Sample Flashover Gas Insulated Transmission Line High-voltage DC Transmission HVDC Power Transmission Modification Time Organic Insulation Power Grid Power Transmission Cables Power Transmission Line Pulse Voltage Surface Charge Accumulation Surface Charge Density Surface Flashover Voltage Trap Distribution Characteristic
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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