摘要
受变电站实际空间的限制,部分避雷器装设在变电站外的第一级杆塔上,在多重雷击下已造成多起事故。为研究该装设方式对站内热备用断路器等设备雷电侵入波过电压的影响,基于行波理论推导了考虑避雷器通过杆塔接地时的雷电侵入波过电压随设备与避雷器间电气距离的变化规律,进一步结合ATP-EMTP研究了工程实例中避雷器通过杆塔接地时的设备过电压规律。结果表明杆塔高度、杆塔波阻抗主要影响电气距离大于某一临界距离时的断路器断口过电压,杆塔接地电阻对断口过电压影响可以忽略。工程上可采取缩短电气距离、降低第一级杆塔高度、降低杆塔波阻抗等方式减小断口过电压。
Limited by the actual space of the substation,some lightning arresters are installed on the first stage tower outside the substation,which has caused many accidents under multiple lightning strikes.Way for the study of the furnish on station internal heating stand-by circuit breaker equipment such as the impact of lightning invasion wave overvoltage,based on the traveling wave theory is developed,with the consideration of lightning arrester through tower grounding lightning invasion wave overvoltage of changing with the electric distance between equipment and lightning arrester,further combining with ATP-EMTP,arrester in engineering example is studied through the tower grounding device overvoltage.The results show that the tower height and the tower wave impedance mainly affect the breaker breaking over-voltage when the electrical distance is greater than a certain critical distance,and the tower grounding re-sistance has negligible effect on the breaker breaking overvoltage.In engineering,the overvoltage can be reduced by shortening the electrical distance,reducing the height of the first stage tower,and reducing the wave impedance of the tower.
作者
冯亮
FENG Liang(China Railway Construction Corporation Limited,Jinan 250000,China)
出处
《电瓷避雷器》
CAS
北大核心
2023年第2期113-118,126,共7页
Insulators and Surge Arresters
关键词
避雷器
接地
雷电侵入波过电压
行波理论
杆塔
arrester
grounding
lightning intruding overvoltage
traveling wave theory
tower
