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2 Przegląd Elektrotechniczny

2 2012

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Research on Thermal Conduction Mechanism on Electrode Surface in Field-distortion Gas Switch Discharging

Hu W., Qiaogen Z., Jin W., Xuandong L., Aici Q.

Przegląd Elektrotechniczny

2012

R. 88, nr 2

253-257

Pulsed power technology is one of the technological foundations in high and new technology research, which has extremely broad development and application prospect. Gas switch is one of the key elements in pulsed-power devices, and electrode erosion is a key restrictive factor in high-power gas switch development and application. According to one dimensional equation of heat conduction and thermal equilibrium equation near the electrode surface, this paper researches electrode heat conduction mechanism, calculates electrode erosion heat fluxes and their peak powers caused under different discharge conditions. Calculation results indicate that arc joule heat is the main reason of electrode erosion when discharge current is not too high.

Zbadano erozję elektrody w wyłącznikach gazowych przy wyładowaniach impulsowych. Przeprowadzono obliczenia przewodnictwa cieplnego oraz rozkład temperatury wokół elektrody. Stwierdzono że główną przyczyną erozji jest ciepło wyładowania łukowego.

Chaotic Characteristic of Corona Discharge Series in Air Described by a 2D-nonlinear Discrete Dynamic Model

Ming R., Ming D., Zhong R., Haibin Z., Aici Q.

Przegląd Elektrotechniczny

2012

R. 88, nr 11a

303-207

In order to investigate the chaos characteristics of corona discharge current pulse series in air, the statistical distributions of points (qn, ?tn+1) and points (qn, ?tn, qn+1) were plotted and compared under different experimental conditions including applied voltage value, gap distance and curvature radius of positive point, etc. To describe and study this phenomenon in view of non-linear dynamics, a 2-dimensional nonlinear discrete dynamic model was built. The equation forms and its specific coefficients of the model were obtained by fitting method. The basic dynamic characteristics including the Eigenvalue of the linear matrix- ? (Lyapunov exponent) and the attractors were calculated and analyzed. And then, the output q-t series of the model at three different modulus of Lyapunov exponent were simulated and discussed. As a conclusion, it was suggested that the randomness and statistical feasibility of corona discharge series were greatly influenced by external experiment conditions and the stochastic corona time series in limited time scope could be interpreted as a phenomenon driven by chaos.

W artykule zaprezentowano nową metodę statystycznej charakterystyki wyładowań koronowych występujących seryjnie. Opracowany został dwuwymiarowy model dynamiczny zjawiska, na podstawie którego wyznaczono i poddano analizie charakterystyki dynamiczne oraz kryteria teorii chaosu dotyczące wyładowań koronowych.