特高压GIS现场雷电冲击试验电压台阶现象分析

发布时间：2019-04-24 10:21

【摘要】：随着电压等级的提高,气体绝缘金属封闭开关设备(gas-insulated metal-enclosed switchgear,GIS)的应用越来越广泛。为确保绝缘性能,GIS设备在入网前都要进行现场耐压及绝缘试验。雷电冲击耐压试验是GIS等高压电器设备现场试验必须进行的试验项目之一,但现场发现,雷电冲击耐压试验过程中存在波形畸变问题,在雷电波的上升沿会出现所谓的"台阶"现象。通过ATP-EMTP电磁暂态分析软件搭建试验系统模型,对电压波在特高压GIS负载内的传播过程进行了计算,并对出现台阶现象的原因进行了分析。结果表明,台阶现象是由负载的分布特性与各个电气环节间波阻抗的相互作用引起,高压引线与分支母线间节点处、分支母线末端集中性负载所产生的电压负反射是引起电压波形出现台阶的主要因素。根据以上研究,提出了存在台阶的试验电压波形波前时间的确定方法。
[Abstract]:With the increase of voltage level, gas insulated metal enclosed switchgear (gas-insulated metal-enclosed switchgear,GIS) is used more and more widely. In order to ensure insulation performance, GIS equipment should carry out on-site voltage and insulation tests before entering the network. Lightning impulse withstand voltage test is one of the test items which must be carried out in the field test of high voltage electrical equipment such as GIS, but it is found on the spot that the waveform distortion exists in the process of lightning impulse voltage withstand test. The so-called "step" phenomenon appears along the rising edge of lightning waves. The propagation process of voltage wave in ultra-high voltage GIS load is calculated by using ATP-EMTP electromagnetic transient analysis software to build a test system model, and the cause of step phenomenon is analyzed. The results show that the step phenomenon is caused by the interaction between the load distribution characteristics and the wave impedance among the electrical links, at the node between the high voltage lead line and the branch bus. The negative reflection of voltage generated by the concentrated load at the end of the branch bus is the main factor causing the voltage waveform to appear step-by-step. Based on the above research, a method for determining the wavefront time of the test voltage waveform with step is proposed.
【作者单位】：西安交通大学电气工程学院;
【基金】：国家电网公司科技项目(GYB17201400111;SHJJGC1500189)~~
【分类号】：TM595

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