电流分布不均匀性对多柱并联ZnO避雷器能量吸收能力的影响  

Influence of Non-uniform Current Distribution on Energy Absorption Capability of Multi-column Parallel ZnO Arrester

作　　者：陈锡磊 杨科 何整杰 王东举[2] CHEN Xilei YANG Ke HE Zhengjie WANG Dongju(State Grid Cixi Power Supply Company, Cixi 315300, China College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

机构地区：[1]国网浙江慈溪市供电公司,浙江慈溪315300 [2]浙江大学电气工程学院,浙江杭州310027

出　　处：《陕西电力》2017年第3期82-85,共4页Shanxi Electric Power

摘　　要：出于降低保护水平和满足高通流能量需求的目的,往往要求直流输电系统中的避雷器采取多柱并联的结构。但是由于多柱并联避雷器的电阻片之间伏安特性的偏差会存在电流分布不均匀的现象,从而影响整支避雷器的能量吸收能力。从理论上对考虑了电流分布不均匀特性后的避雷器能量吸收能力进行分析,结果表明:电阻片伏安特性的略微偏差会引起较大的避雷器电流分布不均匀;电流分布不均匀会降低整支避雷器的能量吸收能力,n柱避雷器并联后,其能量吸收能力相当于单柱避雷器能量吸收能力的n/β;为达到各柱均流的目的,应当控制电阻片残压偏差不超过1%,以保证电流分布不均匀系数β不超过1.1。Multi-column parallel arresters are often adopted in HVDC transmission projects in order to decrease protection level and satisfy high energy demand, but there is a problem of the non-uniform current distribution between the columns because of V- I characteristic deviation, which influences the energy absorption capability of the multi-column arrester. The theoretical analysis of the arrester energy absorption capability considering the non-uniform current distribution is presented. The results show that the lit- tle deviation of V-I characteristic will resuh in notable non-uniform current distribution; the non-uniform current distribution de- creases the energy absorption capability of a n-column arrester corresponding to n/β times that of one column arrester; in order to satisfy the current sharing between the columns, the deviation of discharge voltages shall not be more than 1%, to insure the eur- rent distribution nonuniform coefficient β is not more than 1.1.

关 键 词：避雷器 多柱并联 电流分布不均匀系数 能量吸收能力 

分 类 号：TM507[电气工程—电器]