kV变电站接地与防雷的设计.docVIP

110kV变电站接地与防雷的设计 院 系：信息工程学院 专 业 班： 姓 名： 学 号： 指导教师： 2013年5月 110kV变电站接地与防雷的设计 The Design of 110kV Substation Grounding and Lightning Protection 摘 要 众所周知，雷电具有极大的破坏性，其电压高达数百万伏，瞬间电流可高达数十万安培。雷击所造成的破坏性后果体现于下列三种层次：①设备损坏，人员伤亡；②设备或元器件寿命降低；③传输或储存的信号、数据（模拟或数字）受到干扰或丢失，甚至使电子设备产生误动作而暂时瘫痪或整个系统停顿。变电站是整个供电系统最为重要的组成环节之一，如果变电站发生雷击事故，将造成大面积停电，给社会生产和人民生活带来不便，这就要求变电站防雷措施必须十分可靠。此文章对变电站防雷保护系统进行了设计，并提出了变电站防雷与接地措施。根据该变电站的基本情况，对该变电站的接地网防雷和保护进行设计，使该站的接地电压满足允许值，跨步电压和接地电压不超过允许值，其接地电阻、接触电压和跨步电压都满足要求，选择合适的设备对雷入侵波引起的过电压进行保护，由变电站土建面积进行变电站电气总平面的布置，根据避雷针设置规则、变电站构架跨度及保护站内所有电器设备的要求，对站内进行避雷针设置构成防雷保护措施，使全站设备都处于防雷保护范围内。本文通过计算短路电流，从结论中选择合适接地材料，设置接地网，达到防雷保护变电站的全范围目的。 关键词：电力线路 110kV变电站 防雷措施 接地网设计 Abstract It is well known that lettuce-eaters highly destructive, the voltage up to hundreds of millions of volts, current can be as high as hundreds of thousands of amperes. Lightning strike caused by the damaging consequences of embodied in the following three levels ：（1） Equipment damage, casualties; (2) equipment or components reduced life spans; （3）data transmission or storage of signal (analog or digital) interference or lost, or even make electronic equipment misoperation and temporary paralysis or the entire system to a halt. Substation is one of the most important component part of the whole power supply system, if the substation lightning accident occurs, it will cause blackouts and inconvenience to the social production and peoples lives, which requires lightning protection measures have to be very reliable. According to the substation, lightning protection and protection of the substation grounding grid design, the station and the ground voltage to meet the allowable value, the step voltage and ground voltage does not exceed the allowable value, the grounding resistance, touch voltage and stepvoltage requirements are met, select the appropriate equipment of lightning invasion wave overvoltage protection master plan layout of the electrical substation by substation civil area, set the rul