摘要
石墨基柔性接地材料因具有化学性质稳定、耐腐蚀性优异、与土壤相容性较好等优点被应用在输电线路杆塔接地体中,但是其在应用时的适应性必须依据输电线路的输送能量、杆塔位置和运行环境确定。本文通过建立不同输电线路杆塔接地装置的有限元仿真模型,计算相应的接地电阻;根据接地电阻值,采用ATP-EMTP软件,计算接地短路及雷电冲击大电流下流过接地装置的电流和温升,从接地电阻和工频短路电流,以及雷电冲击大电流下的温升两个方面,研究石墨基柔性接地装置在输电线路中的适用性。研究结果表明,规程要求的工频接地电阻满足输电线路杆塔接地电阻的要求,但是特高压输电线路发生单相接地短路故障时,保护拒动会使接地装置的温升超过限值。
Graphite based flexible grounding materials are used in transmission line tower grounding body because of their stable chemical properties,excellent corrosion resistance and good compatibility with soil.However,their adaptability must be determined according to the transmission energy,tower position and operation environment of transmission line.In this paper,the finite element simulation models of different transmission line tower grounding devices are established,and the corresponding grounding resistance is calculated.According to the value of grounding resistance,using ATP-EMTP software,the current flowing through the grounding device under grounding short circuit and lightning impulse current and temperature rise are calculated.The applicability of graphite based flexible grounding device in transmission line is studied from two aspects of grounding resistance,temperature rise under power frequency short circuit current and lightning impulse current.The research results show that the power frequency grounding resistance required by the regulations meets the requirements of transmission line tower grounding resistance,but in case of single-phase grounding short-circuit fault of UHV transmission line,the failure of protection will make the temperature rise of grounding device exceed the limit value.
作者
张国锋
惠康
务孔永
郭洁
ZHANG Guofeng;HUI Kang;WU Kongyong;GUO Jie(He’nan Star Electric Power Equipment Co.,Ltd,Xuchang,He’nan 461503;Xi’an Jiaotong University,Xi’an 710049)
出处
《电气技术》
2021年第10期93-97,103,共6页
Electrical Engineering
关键词
输电线路
石墨基柔性接地装置
工频接地电阻
温升特性
transmission line
graphite-based flexible grounding device
power frequency grounding resistance
temperature characteristics
