Study on Threshold Voltage for Stable Arcing by the Low Voltage Side of DC Distribution Line
Xiong Lan1, Chen Yonghui2, Yang Zikang1, Tang Hailong1, Guo Ke1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. Zaozhuang Power Supply Company of State Grid Shandong Electric Power Company Zaozhuang 277000 China
Abstract The wide application of distributed generator, power electronic technology and DC load promote the development of DC distribution network. However, it is difficult to extinguish the DC arc without crossing the zero point, which seriously threatens the safety of DC distribution network. In this paper, a simulation experiment platform including DC low-voltage bus (with maximum value as 380V), are generator and load is built. The arcing experiment is designed to obtain the stable burning point of the arc under the resistive load and also the influence of the load on the arcing process and arc characteristics. The stable voltage source threshold value of arcing under the maximum equivalent load (resistance 280Ω, inductance 30mH) is obtained. Combining the volt-ampere characteristic of the arc with the voltage balance equation, the stable burning point and the burning time are theoretically deduced. The mathematical model of the threshold voltage of the stable burning DC arc is established, and the accuracy of the model is verified by the numerical fitting method with Matlab. The correlation coefficient obtained from both the model and the experiment is 0.992 4, which means the model may determine the voltage threshold of stable arc with low voltage inductive load, and provide engineering reference for determining the rating power supply voltage of DC distribution network and stable arcing condition of low voltage DC arc.
Xiong Lan,Chen Yonghui,Yang Zikang等. Study on Threshold Voltage for Stable Arcing by the Low Voltage Side of DC Distribution Line[J]. Transactions of China Electrotechnical Society, 2021, 36(19): 4097-4106.
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2021, Vol. 36 
