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| Mathematical Model and Characteristics of Low Current DC Fault Arc |
| XiongLan1, Zeng Zeyu1, Yang Jun2, Zhong Yuming1, Guo Ke1 |
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;;
2. State Grid Electric Power Research Institute of Qinghai Power Supply Branch Xining 810000 China |
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Abstract DC arc is generated by failure connection, poor contacts and insulation failure of cables, it is difficult to extinguish and to be detected, and the extreme high temperature roused by arc may cause fire. It is of great significance to study DC arc characteristics. In this paper, a DC arc fault test platform was set up. The influence of voltage, current of DC power supply and electrode distance on arc characteristics is studied from abundant experiment data. It is proved that current and gap distance were the main factors affecting arc characteristics, and the DC voltage may guarantee whether arc is generated and maintained or not. Meanwhile, numerical fitting arc models as arc resistance R versus I (current) and L (electrode distance) and also V=f(I, L), P=g(I, L) are established respectively. The R-I, V-I and P-I characteristics curves are almost consistent with the discrete experimental data. Finally, based on the equilibrium plasma theory and Chapman-Enskog method, σ(conductivity)-T(temperature) curves are obtained for different arc dielectric medium such as pure air and air with different percentage of copper vapor. Then software COMSOL is used to simulate and analyze the arc resistance under different electrode spacing. The simulation results with copper vapor are almost consistent with the measured data. The results of this paper provide a theoretical basis for further study on the general characteristics of DC arc fault.
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Received: 01 July 2018
Published: 17 July 2019
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2019, Vol. 34 
