农村变电站防雷保护与接地装置设计探讨

Discussion on design of protection against lightning and earthing installation for rural substation

根据对农村35 kV变电站防雷保护与接地装置设计的实践体会,就农村35 kV变电站防雷保护与接地装置设计中存在的主要问题进行探讨。指出在变电站的进线保护设计中,为便于进线防雷保护避雷线的安装,要注意线路终端与母线门型架不带角度(小于5)°。在避雷针保护范围的设计中,多年来的实践证明折线法计算能满足电力行业的要求,而且与滚球法相比具有一定的优越性。提出了在防止反击过电压和接地装置的设计中应该注意的主要问题,并指出实践中采用的对策。

According to the practice of protection against lightning and earthing installation design for 35 kV rural substation,the existent major problems were discussed.It is pointed out that the angle between line and bus door type frame should be smaller than 5°in order to install the lightning conductor of incoming line protection in substation incoming line protection design.In the design of lightning rod protection scope,the results calculated by broken line method can satisfy the requirements of power industry,which is proved by the practice for many years and have certain superiority compared with rolling ball method.The major problems to prevent overvoltage and in design of earthing installation are put forward,and the countermeasures adopted in practice are pointed out.The paper has certain practicality and is available for reference to aiming at the same problems.