高电压技术2013，Vol.39Issue(3)：568-576,9.DOI:10.3969/j.issn.1003-6520.2013.03.009
±800 kV特高压直流输电线路的电位转移电流特性
Characteristics of Potential Transfer Current of ±-800 kV UHVDC Transmission Line
摘要
Abstract
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.关键词
±800 kV/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Key words
±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引用本文复制引用
刘凯,吴田,刘庭,肖宾..±800 kV特高压直流输电线路的电位转移电流特性[J].高电压技术,2013,39(3):568-576,9.基金项目
国家电网公司科技项目(SG09056). （SG09056）
