摘要
为了确保±800kV特高压直流(UHVDC)输电线路带电作业过程中线路和作业人员的安全,对带电作业进入等电位过程中的电位转移电流特性进行研究有助于采取适当的防护措施。为此,采用光纤脉冲电流测量系统对进入±800kV特高压直流输电线路过程中的电位转移电流进行了测量,进入直流等电位过程中的电位转移电流脉冲最大幅值为149.98A,脉冲宽度为几十μs,正极性和负极性脉冲都存在。根据进入交直流线路等电位的特点,采用电磁分析软件研究了进入等电位过程中作业人员与极导线间的电位分布,计算了作业人员与极导线和杆塔等接地构件间的电容,根据这些参数建立了交直流线路进入等电位过程中的电位转移电流的分析模型,对特高压交流(UHVAC)与特高压直流线路的电位转移电流进行了计算。计算与测量结果表明特高压直流线路的电位转移电流远小于特高压交流线路,可以为特高压输电线路带电作业方法的选取提供参考。
To ensure the safety of both lines and working staff while live working on ±800 kV ultra high voltage DC（UHVDC） transmission lines,studies of potential transfer current（PTC） in the process of live working entering into equal-potential status will contribute to adopting appropriate protections.Thus,we measured the PTC in live workings on ±800 kV UHVDC lines by using a fibre-optic pulsed-current measuring system.The PTC has a magnitude of 149.98 A and a pulse width of tens of μs,and it has both positive and negative polarity pulses.Taking the characteristics of shifting into equal-potential status into consideration,we investigated the potential distribution in the space between the worker and line by using an electromagnetic analysis software,and calculated the capacitance between workers and grounding structures,such as polarity conductors and towers.Based on the obtained parameters,analysis models of the PTC in the shifting process of both ultra high voltage AC（UHVAC） and UHVDC lines were established,and the PTC was calculated,respectively.The measurement and calculation results show that the PTC of UHVDC lines is much lower than that of UHVAC lines.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第3期568-576,共9页
High Voltage Engineering
基金
国家电网公司科技项目(SG09056)~~
关键词
±800kV
特高压直流
UHVDC
特高压交流
UHVAC
输电线路
带电作业
电位转移电流
脉冲电流
仿真计算
光纤测量
±800 kV
ultra high voltage direct current
UHVDC
ultra high voltage alternating current
UHVAC
transmission line
live working
potential transfer current
impulse current
simulation and calculation
fibre-optic measuring
