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Title: Influence of humidity on the characteristics of positive corona discharge in air

Abstract

Detailed positive corona discharge characteristics, such as the corona onset voltage, pulse amplitude, repetition frequency, average corona current, rise time, and half-wave time, are systematically studied under different air humidity with a single artificial defect electrode. The experimental results indicate that the pulse amplitude decreases with the increase of air humidity; meanwhile, the repetition frequency increases as the air humidity increases. This phenomenon is different from that of negative corona discharge. Therefore, to have an insight into the mechanism of humidity influence on positive corona discharge, a positive corona discharge model based on the continuity equations is utilized. The simulations present a dynamic development of positive corona discharge and, meanwhile, reveal the humidity influence on positive corona discharge.

Authors:
; ; ;  [1]
  1. State Key Lab of Power Systems, and Department of Electrical Engineering, Tsinghua University, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22600150
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AIR; AMPLITUDES; COMPUTERIZED SIMULATION; CONTINUITY EQUATIONS; CORONA DISCHARGES; DEFECTS; ELECTRIC POTENTIAL; ELECTRODES; HUMIDITY; PULSE RISE TIME; PULSES

Citation Formats

Xu, Pengfei, E-mail: xpftsh@126.com, Zhang, Bo, E-mail: shizbcn@mail.tsinghua.edu.cn, Chen, Shuiming, E-mail: chensm@tsinghua.edu.cn, and He, Jinliang, E-mail: hejl@tsinghua.edu.cn. Influence of humidity on the characteristics of positive corona discharge in air. United States: N. p., 2016. Web. doi:10.1063/1.4953890.
Xu, Pengfei, E-mail: xpftsh@126.com, Zhang, Bo, E-mail: shizbcn@mail.tsinghua.edu.cn, Chen, Shuiming, E-mail: chensm@tsinghua.edu.cn, & He, Jinliang, E-mail: hejl@tsinghua.edu.cn. Influence of humidity on the characteristics of positive corona discharge in air. United States. doi:10.1063/1.4953890.
Xu, Pengfei, E-mail: xpftsh@126.com, Zhang, Bo, E-mail: shizbcn@mail.tsinghua.edu.cn, Chen, Shuiming, E-mail: chensm@tsinghua.edu.cn, and He, Jinliang, E-mail: hejl@tsinghua.edu.cn. 2016. "Influence of humidity on the characteristics of positive corona discharge in air". United States. doi:10.1063/1.4953890.
@article{osti_22600150,
title = {Influence of humidity on the characteristics of positive corona discharge in air},
author = {Xu, Pengfei, E-mail: xpftsh@126.com and Zhang, Bo, E-mail: shizbcn@mail.tsinghua.edu.cn and Chen, Shuiming, E-mail: chensm@tsinghua.edu.cn and He, Jinliang, E-mail: hejl@tsinghua.edu.cn},
abstractNote = {Detailed positive corona discharge characteristics, such as the corona onset voltage, pulse amplitude, repetition frequency, average corona current, rise time, and half-wave time, are systematically studied under different air humidity with a single artificial defect electrode. The experimental results indicate that the pulse amplitude decreases with the increase of air humidity; meanwhile, the repetition frequency increases as the air humidity increases. This phenomenon is different from that of negative corona discharge. Therefore, to have an insight into the mechanism of humidity influence on positive corona discharge, a positive corona discharge model based on the continuity equations is utilized. The simulations present a dynamic development of positive corona discharge and, meanwhile, reveal the humidity influence on positive corona discharge.},
doi = {10.1063/1.4953890},
journal = {Physics of Plasmas},
number = 6,
volume = 23,
place = {United States},
year = 2016,
month = 6
}
  • Detailed negative corona discharge characteristics, such as the pulse amplitude, repetition frequency, average corona current, rise time, and half-wave time, are systematically studied under various air humidities with a single artificial defect electrode. The experimental result reveals that the pulse amplitude increases with the increase of air humidity; meanwhile, the repetition frequency deceases as the air humidity increases. Empirical formulae are first established for the pulse amplitude and repetition frequency with the humidity factor taken into consideration. The effective ionization integral is calculated and a positive correlation is found between the integral and the pulse amplitude. Furthermore, a simplified negative-ionmore » cloud model is built up to investigate the mechanism of the humidity's influence on negative corona discharge. Based on the theoretical analyses, the correlation between pulse amplitude, repetition frequency, and air humidity is well explained.« less
  • The simulation of the temporal evolution of the various neutral gaseous species studied (O, O{sub 3}, H, OH, HO{sub 2}, H{sub 2}O{sub 2}, N, NO, NO{sub 2}, NO{sub 3}, N{sub 2}O, N{sub 2}O{sub 5}, HNO{sub 2}, and HNO{sub 3}) use corona effects. The physical conditions of the discharge were used. The reactions take place in dry or humid air, after the dissociation of O{sub 2}, N{sub 2}, and H{sub 2}O by an electronic pulse. When water vapor is present, there is a probability of production of H{sub 2}O{sub 2}, HNO{sub 2}, and HNO{sub 3} in air. Temperature and humidity havemore » cumulative effects. With multiple pulses, the O{sub 3} maximal concentration is obtained for a limited number of pulses.« less
  • The simulation of the temporal evolution of the various neutral gaseous species studied (O, O{sub 3}, H, OH, HO{sub 2}, H{sub 2}O{sub 2}) use corona effects. The physical conditions of the discharge were used. The reactions take place in dry or humid oxygen, after the dissociation of O{sub 2} and H{sub 2}O by an electronic pulse. When water vapor is present, there is a probability of production of H{sub 2}O{sub 2} in oxygen. Temperature and humidity have cumulative effects. With multiple pulses, the O{sub 3} maximal concentration is obtained for a limited number of pulses.
  • The effect of the temperature of the corona electrode on the electrical characteristics of a corona discharge was studied experimentally. A modified Townsend formula for the current-voltage characteristic of a one-dimensional corona is proposed. Gasdynamic and thermal characteristics of a positive corona discharge in a coaxial electrode system are calculated. The calculated results are compared with the experimental data.
  • By a two-dimensional (2-D) numerical simulation of positive corona with extensive chemical reactions, two parameters such as E/N{sub eff} (effective electric field for electrical energy transfer) and G-factor are calculated. E/N{sub eff} weakly depends on the humidity but strongly depends on the applied voltage. As the applied voltage increases, the corona formation and propagation time decrease, but the other parameters show very weak dependence. Electron collision G-factors of OH, O radicals reach their maximum value at E/N {approximately}150 Td but electron collision G-factor of N radical increase with E/N. Full chemical reaction considered G-factor shows different time evolution characteristics withmore » E/N{sub eff}. Since the dominant reaction process for the N, O radical is through the electron collision, the electron collision G-factor and E/N{sub eff} well represent the full chemical reaction considered G-factor. But the OH radical is dominantly generated by the radical reactions. The G-factor of OH radical shows a time-delayed characteristic.« less