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Optical emission spectroscopy study on flashover along insulator surface due to particle contamination

Published online by Cambridge University Press:  04 November 2014

Somesh Vinayak Tewari ,
R.J. Kshirsagar ,
Amitava Roy ,
R. Sarathi ,
Archana Sharma  and
K.C. Mittal
Somesh Vinayak Tewari*
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
R.J. Kshirsagar
Affiliation:
High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
Amitava Roy
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
R. Sarathi
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology, Madras, Chennai, India
Archana Sharma
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
K.C. Mittal
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
*
Address correspondence and reprint requests to: Somesh Vinayak Tewari, Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India. E-mail: [email protected]
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Abstract

The surface flashover behavior in ambient air and nitrogen are studied at a pressure of 1 kg/cm2 using optical emission spectroscopy. A high dc voltage is applied to Rogowski profile electrodes with polyoxymethylene as the insulator between the electrodes. Three different conditions of needle protrusion along the surface of polyoxymethylene are used to study the variation in spectral characteristics due to particle contamination. When the insulator is placed between the spark gap electrodes, the OES spectra are dominated by the Hα line in air and nitrogen medium. It was found that the intensity of N2+ (B-X) emission is less in air surrounding the insulator medium. The plasma temperature during bulk breakdown in air is 0.433 eV, which increases to 0.434 eV with the pressurized nitrogen, which further increases in the presence of insulator to 0.441 eV and 0.44 eV in nitrogen and air, respectively. The electron density is obtained from the N emission line at 746.8 nm and the estimated peak value is 2.85 × 1012 cm−3 in the presence of insulator. The plasma temperature decreases with increase in distance of particle contamination from cathode. The increase in electron density in air, as compared to nitrogen implies more material desorption in air which is also supported by the comparisons of Hα lines.

Keywords

Optical emission spectroscopyspark gapinsulatorsurface flash over
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 4 , December 2014 , pp. 681 - 689
Copyright
Copyright © Cambridge University Press 2014 

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