期刊论文

中文

电瓷避雷器

1003-8337

2017

3

147-152

10.16188/j.isa.1003-8337.2017.03.029

本校为第一机构

变压器中性点常采用避雷器与放电间隙相并联方式来保护中性点绝缘,但由于间隙放电的分散性,使得其配合困难从而常导致间隙误放电和拒放电。为了防止误放电和拒放电,准确地确定间隙的距离是绝缘配合的关键,最好的方法是绘制伏秒特性曲线,但此曲线绘制工作量过于繁杂。因此,提出运用正态概率分布,对雷电冲击放电和工频放电数据进行分析,选取间隙距离的方法,减小了间隙误放电和拒放电的概率,提高变压器中性点绝缘保护能力和供电可靠性。并应用该方法对金属氧化物避雷器并联保护间隙装置进行放电试验对比,试验证明了该方法是准确、有效的。

The discharge gap parallel arrester is often used to protect the transformer neutral point insulation. But due to the dispersion of the gap discharge, it is difficult to coordinate and often leads to gap mis-discharge or refused to discharge. To prevent the mis-discharge and refused to discharge. Accurately determine the gap distance is the key to the insulation coordination, the best method is to draw the volt-second characteristic curve, but the curve plotting workload is too multifarious. Therefore, it is proposed to use the normal probability distribution, of lightning impact discharge and...