Influence of Electrode Types on Arcing Characteristics and Pressure Rise Due to Internal Short-circuit Arcing in a Closed Container
黎鹏1, 屈莹莹1, 吴田1, 李冠南2, 普子恒1, 方春华1, 丁璨1
1.湖北省输电线路工程技术研究中心(三峡大学),湖北省 宜昌市 443002
2.武汉大学 电气与自动化学院,湖北省 武汉市 430072
LI Peng1, QU Yingying1, WU Tian1, LI Guannan2, PU Ziheng1, FANG Chunhua1, DING Can1
1. Hubei Provincial Engineering Technology Research Center for Power Transmission Line(China Three Gorges University), Yichang 443002, Hubei Province, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, Hubei Province, China
Internal short-circuit arcing faults in the switchgear happen occasionally, and huge energy released by the arc in a short time makes the pressure rise rapidly in the compartment, bringing a great threat to the safety of equipment, building and operation personnel. The arc tests in actual switchgear are time-consuming and highly costing, so the internal short-circuit arcing tests in a simulated closed container become a main way to study this problem. In this paper, the short-circuit arcing tests of rod-rod and plane-plane gaps in a closed container are carried out by the LC oscillation circuit, and the influence of electrode types on the arcing characteristics and pressure rise (relative pressure) in a closed container is analyzed. Results show that, the arc voltage is related to the factors, such as pressure rise, airflow, electrode type and so on. The value of arc voltage is different from the open environment. The ranges of the arc voltage gradient for rod-rod and plane-plane gaps are 18.8~23.8 V/cm and 15.9~ 19.6 V/cm, respectively. For plane-plane gap, the arc voltage has big fluctuation and showing a large degree of randomness, which is smaller than the rod-rod gap. Under the same gap distance and arc energy, the pressure rise caused by the arcing of plane-plane gap is greater than the rod-rod gap.
KEY WORDS :closed container;electrode type;short-circuit arcing;arc voltage;pressure rise;
0 引言
高压开关柜作为重要的控制和保护设备,广泛应用于配电系统[1-2]。实际运行过程中,由于绝缘老化、污秽、异物以及过电压等因素的影响,开关柜内部短路燃弧故障时有发生,对设备、建筑物以及工作人员的安全造成了巨大威胁[3-4]。为降低开关柜内部短路燃弧故障的危害,GB 3906—2006和IEC 62271-200均将内部电弧级开关设备和控制设备(internal arc classified switchgear and controlgear,IAC)的内部电弧试验列为强制性的型式试验[5-6]。当隔室内部发生短路燃弧故障时,电弧的能量释放过程与气体爆炸现象类似[7],将使隔室内部的压力骤增,轻则造成柜门、隔板等部件变形损坏,重则导致柜体爆裂引发严重事故。因此,研究高压开关柜内部短路燃弧产生的压力效应具有重要意义。
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