10kV变电所低压侧环形接地线截面选择探讨  

Discussion on Selection of Low Voltage Side Annular Grounding Wire Section in 10kV Substation

作　　者：雷海霞 LEI Haixia(Fujian Architectural Design Research Institute Co.,Ltd,Fuzhou 350001)

机构地区：[1]福建省建筑设计研究院有限公司

出　　处：《福建建筑》2019年第8期90-95,共6页Fujian Architecture & Construction

摘　　要：介绍了变电所变压器中性点在不同的接地方式下环形接地线的作用,详细分析了国家标准图集、实际工程中环形接地线“普遍做法”的潜在问题;验算了在变压器低压起始端发生单相接地故障时短路电流及环形接地线截面。研究结果认为,40×4扁钢作为环形接地线的统一做法不具有普遍合理性,变电所低压侧环形接地线截面选择,应根据低压侧不同的接地方式确定,并基此针对“普遍做法”提出优化方案。This paper introduces the role of the ring grounding wire of the transformer neutral point in the substation under different grounding modes,and analyzes the potential problems of"general practice"for ring grounding wires in national standard atlas and practical projects in detail.And calculates short-circuit current and cross-section verification of ring grounding wire when single-phase ground fault occurs at the low-voltage starting end of the transformer.The result indicates that the uniform practice of 40×4 flat steel as a ring ground wire does not have universal rationality.The cross-section selection of the ring-shaped grounding wire on the low-voltage side of the substation should be determined according to the different grounding methods on the low-voltage side,and an optimization scheme is proposed for the“universal practice”.

关 键 词：中性点接地方式 环形接地线 单相接地故障电流 PE导体截面 

分 类 号：TU852[建筑科学]