Impedance characteristics of high-frequency arc in short SF6 gap

被引：5

作者：

机构：

[1] China Electric Power Research Institute

[2] School of Electrical Engineering, Xi'an Jiaotong University

[3] State Grid Corporation of China

来源：

Li, Z. (lizb@epri.sgcc.com.cn) | 1600年 / Science Press卷 / 39期

关键词：

Arc inductance; Arc resistance; Gas insulated switchgear; High-frequency discharge; SF[!sub]6[!/sub] gap; Very fast transient overvoltage;

D O I：

10.3969/j.issn.1003-6520.2013.06.018

中图分类号：

学科分类号：

摘要：

In gas insulated switchgears (GIS), very fast transient overvoltage (VFTO) generated by discharges between disconnector contacts threatens the safety of electric equipment seriously. Impendence characteristics of high-frequency arc have an important influence on VFTO waveforms in the rise time and amplitude, etc. We put forward a scheme that adopted SF6 gap to research the impedance characteristics in which the work would be carried out with short SF6 gap and then long gap, and introduced some researches on short SF6 gap. An impact RLC discharge circuit with a short SF6 gap was designed to generate high-frequency arc. High voltage probe, Rogowski coil, and B-dot sensor were used to measure arc voltage, arc current, and the variation ratio of current, respectively. High speed framing camera (HSFC) was adopted to observe the arc shape. After proposing a method for analyzing the arc inductance and resistance, we discussed the influence of gas pressure, arc length, and current on the arc inductance and resistance, then put forward a mathematical model of arc resistance based on energy balance principle. The results show that, after the initial discharge, the arc inductance decreases rapidly from 13 μH/m to a stable value of 9 μH/m, meanwhile the arc resistance drops to 1 Ω within 60 ns, then deceases slowly to a stable value of 0.1 Ω. The arc inductance and resistance increase with increasing gas pressure, and decrease with increasing current. The proposed mathematical model can be used to calculate the arc resistance of the whole process, and its calculation results fit well with those obtained from experiments.

引用

页码：1411 / 1418

页数：7

共 23 条

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