特高压变电站接地优化设计Ground Optimized Design of UHV Substation
刘铜锤,姜龙
LIU Tongchui,JIANG Long
摘要(Abstract):
特高压变电站电压等级高、容量大,接地短路电流较大,为保证其接地系统具有良好的散流效果,确保人身和设备的安全,应对接地设计进行优化,均衡接地网地表位分布,降低接地电阻、接触电压和跨步电压。以某1 000 kV特高压变电站为例,采用CDEGS软件作为仿真工具,考虑变电站实际占地面积和几何结构,结合当地季节因素,通过分析接地网埋深、不等间距布置、垂直接地极对接地系统关键参数的影响,以降低接地电阻、接触电压和跨步电压为目标,对接地设计进行优化,并分析了优化后的接地设计对改善接地效果的影响。
UHV substation is characterized by high voltage, large capacity and big grounding fault current.Fault current release of grounding system and personnel and equipment safety are guaranteed by earthing design optimization, surface potential distribution balancing of earthing network, resistance, contact voltage and step voltage reduction. In this paper, a 1 000 kV UHV substation is proposed as a typical example, in which CDEGS, as a simulation tool, is employed to optimize the earthing design and analyze the effect of the optimized earthing design for the purposes of earthing resistance, contact voltage and step voltage reduction on account of substation coverage and geometric structure as well as local seasonal factors and impact of burial depth, unequal spacing layout and vertical earthing electrode.
关键词(KeyWords):
特高压变电站;不等间距;接地电阻;CDEGS;接地优化设计
UHV substation;unequal spacing layout;earthing resistance;CDEGS;earthing design optimized
基金项目(Foundation):
作者(Author):
刘铜锤,姜龙
LIU Tongchui,JIANG Long
DOI: 10.19585/j.zjdl.202007002
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- 特高压变电站
- 不等间距
- 接地电阻
- CDEGS
- 接地优化设计
UHV substation - unequal spacing layout
- earthing resistance
- CDEGS
- earthing design optimized