电瓷避雷器Issue(2)：125-133,9.DOI:10.16188/j.isa.1003-8337.2025.02.016
雷击及工频续流条件下杆塔接地体热稳定性研究
Thermal Stability of Tower Grounding Electrode Under Lightning Strike and Power Frequency Follow Current
摘要
Abstract
In order to study the dynamic and thermal stability and influencing factors of the grounding electrode of the tower under the conditions of lightning strike and power frequency follow current,ATP-EMTP software is used to calculate the current flowing into the grounding device under the conditions of lightning strike and power frequency follow current,and the calculated ground current is used as the ter-minal condition of the finite element simulation model of the tower grounding electrode,and the grounding material is selected from mild steel and linear and flat ribbon flexible graphite,and the temperature rise and influencing factors of the grounding electrode under the conditions of lightning strike and power fre-quency follow current are analyzed.The results show that when the lightning current and power frequency follow current flow into the grounding electrode,the temperature rise at the down conductor of the ground-ing electrode is significantly higher than that of other positions of the grounding electrode,and the tem-perature rise of the down conductor exposed to air is the highest.The temperature rise caused by power frequency follow current on the grounding electrode of the tower is greater than that of lightning current,and under the same amplitude current,the temperature rise of flat strip flexible graphite is the highest,and the lowest is that of low carbon steel.The temperature rise of the grounding electrode increases with the increase of the amplitude of the current.Under lightning strike conditions,with the increase of soil density and soil constant pressure heat capacity,the temperature rise of the grounding electrode increa-ses,but the effect is not obvious,and the soil thermal conductivity has no effect on the temperature rise of the grounding electrode,while the temperature rise of the grounding electrode decreases with the in-crease of soil density,soil constant pressure heat capacity and soil thermal conductivity under the condi-tion of power frequency follow current.关键词
工频续流/COMSOL有限元/热稳定性/柔性石墨Key words
power frequency follow current/COMSOL finite element/thermal stability/flexible graphite引用本文复制引用
田海鹏,贾磊,胡上茂,胡元潮,屈路,刘刚..雷击及工频续流条件下杆塔接地体热稳定性研究[J].电瓷避雷器,2025,(2):125-133,9.基金项目
南方电网公司基金项目(编号:CSGULAEMEST-2021-KF-05). Project supported by Science and Technology Program of Southern Power Grid(No.CSGULAEMEST-2021-KF-05). （编号:CSGULAEMEST-2021-KF-05）
