10kV配电线路防雷保护间隙的设计

The Design of the Clearance of Lightning-proof in a 10 kV Distribution Line

10kV配电线路是电力系统中较靠近用户的一级,绝缘水平较低,且中低压架空线路一般无特别的防雷措施。在研究10kV绝缘导线的断线机理基础上,利用ANSYS软件仿真分析防雷保护间隙与绝缘子配合时遭雷击过电压放电过程及电压等级分布,确定了防雷保护间隙的大小。所设计的防雷保护间隙在非雷击状态不承载电压,雷击时先于绝缘子可靠放电,保护了绝缘子不受烧伤和击穿,保证了线路在雷电过电压下的安全运行。

A 10 kV power distribution line is in vicinity to the user in the electricity system,which has very lower insulation.Also the lower and medium voltage aerial lines usually have no efficient methods to protect from lightning.Based on the reason why the 10 kV insulated wire breaks down,using ANSYS to decide the lightningproof clearance by analyzing the course of over-voltage discharging and its voltage rates distribution when lightning hits the circuit while the clearance cooperates with insulator.The clearance provided is only to arrest the lightning and does not serve any other purpose.But it priors to insulator to discharge when lightning hits so that the insulator can be well protected from being broken down or burnt,which ensures the line operates safely under over-voltage lightning.