摘要
高海拔下比平原地区气体密度小,放电电压降低。因此,高海拔应增加线路的绝缘强度。在绝缘子串中多采用几片绝缘子来改善绝缘子串电压分布。本文依据架空线路设计规程计算了高低海拔500 kV线路采用U210B瓷质绝缘子应当选取的片数,并依此搭建了高低海拔绝缘子串的等效电路,计算并比较了其电压分布。在高低海拔的等效电路中,通过改变劣化绝缘子的位置和数目,计算劣化绝缘子的电压降,对比分析研究劣化绝缘子对不同海拔电压分布的影响。结果表明:相同情况下,高海拔劣化绝缘子的电压降百分比更大。因此高海拔的劣化绝缘子更容易被检测出,以及当前劣化绝缘子判别方法易造成漏判,有待改善。
At high altitudes,the gas density is lower than in plain areas,and the discharge voltage is reduced. Therefore,it should increase the insulation strength of the lineat high altitudes. Several more insulators are used in the insulator string to improve the insulator string voltage distribution. The number of U210 B insulators that should be selected for the 500 kV high-altitude line is calculated,and the equivalent circuit of the high and low altitude insulator strings is constructed accordingly. The voltage distribution is calculated and compared. In the equivalent circuit of high altitude and low altitude,the voltage drop of degraded insulator is calculated by changing the position and number of deteriorated insulators.The influence of degraded insulators on voltage distribution at different altitudes is compared and analyzed. It is concluded that under the same conditions,the percentage of voltage drop of high-altitude deteriorating insulators is greater. Therefore,the high-temperature deteriorating insulator is more easily detected,and the current degraded insulator discrimination method is likely to cause a missed judgment and needs to be improved.
作者
罗浩
郑雷
董振
曲锴
范强
车彬
洪骁
严碧武
LUO Hao;ZHENG Lei;DONG Zhen;QU Kai;FAN Qiang;CHE Bin;HONG Xiao;YAN Biwu(Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 430074,China;Hubei Key Laboratory of Power Grid Lightning Risk Prevention,Wuhan 430074,China;School of Electrical Engineering,Wuhan University,Wuhan 430072,China;Southwest Branch of State Grid Corporation of China,Chengdu 610000,China)
出处
《电瓷避雷器》
CAS
北大核心
2018年第6期172-176,181,共6页
Insulators and Surge Arresters
基金
国家电网公司科技指南项目(超高海拔超高压长链式电网输变电关键技术研究与设备研制)
关键词
高海拔
等效电路
电压分布
劣化绝缘子
high altitudes
equivalent circuit
voltage distribution
degraded insulators
