Calculation of Ozone and NOx Production under AC Corona Discharge in Dry Air Used for Faults Diagnostic

DOI

10.2991/mmeceb-15.2016.91How to use a DOI?

Keywords

Ozone Production; NOx Production; AC Corona Discharge

Abstract

Air is one of the most widely used insulation medium in power systems. However, up to now there is no any existing quantitative gas analysis method used for fault diagnostic based on air by-products detection and analysis. In this paper, a new discharge diagnostic method — gas analysis method based on air by-products (ozone and NOx) is proposed. The feasibility of this method is studied in this paper. Firstly, the chemical reaction of air under discharge is analyzed; then a typical partial discharge — protrusion defect discharge is simulated based on electron induced chemical reaction and chemical kinetics. The reaction models are built using differential equation and solved using Runge-Kutta method. The density of O3 and NOx is obtained near needle tip under different discharge and air condition. The results show there are detectable O3 and NOx generated even when discharge capacity is only 5 pC. Meanwhile, when discharge capacity is less than 100 pC the production of O3 and NOx are in the same order. When discharge capacity increases, the production of O3 becomes the main by-product. NOx is less than 1% of O3 when discharge capacity is about 10000 pC. The density of O3 increases linearly with discharge strength and density. Both gas temperature T and pressure P have little impact on the density of O3 and NOx in calculated ranges. However the [NO]/[NO2] does decrease as P and T increases. These properties imply gas analysis method is a potential method to detect discharge faults.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Kang Li
AU  - Hassan Javed
AU  - Guoqiang Zhang
PY  - 2015/12
DA  - 2015/12
TI  - Calculation of Ozone and NOx Production under AC Corona Discharge in Dry Air Used for Faults Diagnostic
BT  - Proceedings of the 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnology
PB  - Atlantis Press
SP  - 461
EP  - 466
SN  - 2352-5401
UR  - https://doi.org/10.2991/mmeceb-15.2016.91
DO  - 10.2991/mmeceb-15.2016.91
ID  - Li2015/12
ER  -