变压器接地新方法研究  

Study on New Method of Transformer Grounding

作　　者：敬亮兵[1] 方梦鸽 李臻奇 扈海泽 荣展鹏 赵军[2] 张宇雄[2] 

机构地区：[1]湖南省电力公司娄底供电局,湖南娄底417000 [2]长沙理工大学电气与信息工程学院,长沙410114

出　　处：《电瓷避雷器》2016年第6期103-108,115,共7页Insulators and Surge Arresters

摘　　要：煤矿电网属于特殊供电用户,其供电系统防雷保护系统也应特殊设计(不能按照一般的经验),35 kV变电站主变变压器中性点的特殊防雷保护更是至关重要。针对山西某煤矿35 kV变电站主变变压器中性点雷电事故,并结合山西地理环境以及其现有的防雷系统,分析得出事故原因是由于变压器中性点对地全绝缘,缺少必要的防雷保护。分析了现有中性点对地绝缘方式存在的问题和缺陷,并提出在变压器中性点采用间隙和避雷器并联接地方法进行改造,最后通过电磁暂态软件ATP-EMTP进行仿真对比现有各种中性点对地绝缘方式防雷效果,证明在变压器中性点采用间隙和避雷器并联接地方法是可行的。Coal mine power grid is a special power supply users that lightning protection system in power supply system should be designed （not in accordance with the general experience）, 35 kV substation main transformer neutral point special lightning protection is essential. Aiming at a coal mine in shanxi, 35 kV substation main transformer neutral point lightning accident, combined with the geographical environment in shanxi and the existing lightning protection system, the cause of the accident is due to the transformer neutral point to earth insulation, lack the necessary lightning protection. The existing problems and defects existing in the neutral point to earth insulation way are analyzed, and the transformer neutral point with clearance and attester parallel grounding method is put forward, finally through the electromagnetic transient software ATP-EMTP simulation the existing form of neutral point to earth insulation lightning protection effect and the effect of the lightning protection measures are put forward by comparison, the method is proved to be feasible in the neutral point of transformer by using the parallel grounding method of gap and arrester.

关 键 词：煤矿 变压器 中性点 对地放电 保护间隙 避雷器 ATP-EMTP 

分 类 号：TD61[矿业工程—矿山机电] TM862[电气工程—高电压与绝缘技术]