DC Flashover Characteristics of a Polymeric Insulator in Presence of Surface Charges
Journal article, 2012

Effect of surface charges on dc flashover characteristics of a composite polymeric insulator is studied by means of experiments and theoretical calculations. The considered insulator consisted of a glass fiber reinforced epoxy core covered with a layer of silicone rubber and terminated by metallic electrodes with rounded smooth edges. In the experiments, the insulator surface was charged by external corona while keeping the electrodes grounded and different charging levels were realized by varying its intensity. A series of disruptive discharge tests were carried out on the charged insulator under negative dc voltages. It was revealed that negative deposited surface charges led to an enhancement of the flashover performance whereas positive ones reduced the flashover voltage level. A theoretical model has been developed and utilized for analyzing the experimental results. In the model, surface charge density profiles deduced from measured surface potential distributions were used as boundary conditions for calculations of electric fields. The measured and calculated flashover voltages were found to be in agreement indicating that the observed variations in the flashover characteristics could be attributed to the modifications of the electric field produced by the surface charges.

streamer criterion

dc flashover volt age

electrostatic field

surface charge

polymeric insulator

Author

Sarath Kumara

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

Shahid Alam

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

Imtiaz Rifanul Hoque

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

Yuriy Serdyuk

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

Stanislaw Gubanski

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

IEEE Transactions on Dielectrics and Electrical Insulation

1070-9878 (ISSN) 15584135 (eISSN)

Vol. 19 3 1084-1090 6215116

Areas of Advance

Energy

Materials Science

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TDEI.2012.6215116

More information

Latest update

4/5/2022 7