CAJ | 학술논문

对山西焦煤矿区某35 kV变电站雷电过电压入侵变电站损坏主变中性点绝缘的典型事故进行了分析与讨论，分析了全绝缘结构变压器的防雷弱点，如线路与变电站设备绝缘配合不当、站内终端塔避雷针引雷、站内局部冲击接地电阻过高等方面的因素。通过高电压实验室试验测得绝缘子的雷电冲击电压值，并提出了变压器中性点加装避雷器、完善进线段保护、拆除进线段不当的防雷设施、降低站内局部冲击接地电阻等防雷改造措施。
대산서초매광구모35 kV변전참뇌전과전압입침변전참손배주변중성점절연적전형사고진행료분석여토론，분석료전절연결구변압기적방뢰약점，여선로여변전참설비절연배합불당、참내종단탑피뢰침인뢰、참내국부충격접지전조과고등방면적인소。통과고전압실험실시험측득절연자적뇌전충격전압치，병제출료변압기중성점가장피뢰기、완선진선단보호、탁제진선단불당적방뢰설시、강저참내국부충격접지전조등방뢰개조조시。
The typical accident of insulation structure transformer neutral point caused by lightning invasion in Shanxi coking coal mining area is analyzed and discussed,and then the weakness of lightning protection on full in-sulation transformer,the mismatch between power line and the insulation of substation equipment,lightning trig-gered by station terminal tower lightning rod,high station impulse grounding resistance and so on,are analyzed. The values of lightning impulse voltage of insulator are tested in high voltage laboratory. Several lightning protection measures,such as installing the lightning arrester to transformer neutral point,perfecting line protection,dismant-ling the lightning protection facilities with unreasonable incoming line,and reducing station local impulse grounding resistance,are put forward.