运用ATPDraw仿真分析变电所接地网雷电暂态效应

The Simulation Analysis of Lightning Transient Effect in Substation Earthing Net by ATPDraw

针对变电所受雷击时接地网中地电位分布不均的问题,运用ATPDraw软件仿真分析接地网的雷电暂态效应。首先,根据单根接地体的通用数学模型搭建ATPDraw接地体单元模型。然后对某500kV变电所实际接地网建立仿真模型,仿真计算其雷电暂态效应。根据工程需要,搭建保护小室附近局部接地网的模型,模拟雷电暂态效应对保护小室接地的影响与危害,并提出改进该接地网的建议方案。

Focusing on the question of asymmetric potential of grounding grid caused by lighting strokes in substation,ATPDraw program is applied in this paper to simulate and analyze the transient process. Firstly, according to the general model of grounding electrode under lightning transient condition,ATPDraw-grounding-electrode models are built up;secondly,a grounding grid model is established based on an actual 500 kV substation,which is used to simulate the transient process in this substation. At last,a part-grounding grid model around relay room is built up to simulate the influence of lightning transient process,and as a calculation result,an improved design project is put forward.