220kV保原线覆冰掉闸分析及防范措施

Analysis And Preventive Measures to the Ice-Cover Automatic Trip of 220kV Power Curriculum from Baode to Yuanping

针对某220 kV保原线覆冰掉闸的事故,对导地线在不同覆冰厚度下的弧垂进行计算,验算了覆冰后不同风速下的风偏角度,比较分析了线路覆冰发生放电的情况,得出了导地线覆冰厚度不同、地线覆冰后低于导线是发生放电的直接原因。提出了防止输电线路覆冰的主要措施,为今后防范覆冰掉闸提供了有效思路。

According to the failure analysis to the ice discharge of 220 kV Baoyuan transmission lines, This paper calculated the sag of the wires and grounded conductors with different thickness of the ice,checked the wind-angle with icing in different speed of the wind, compared and analysed the instance of the windage yaw with icing, and finally made the conclusion that the direct cause of the discharge is that the grounded conductors were lower than the wires with the icing because of the different thickness. After Realiing and grasping the elements of the ice discharge in the transmission lines,a main countermeasure about keeping away from the trip by the ice discharge for the future is put forward to the transmission lines.