±1100kV特高压直流换流站避雷器在内过电压下的保护特性  

Protective Characteristics of MOA Configured in ±1100 kV UHVDC Converter Station Under Internal Overvoltage

作　　者：陈秀娟[1] 张翠霞[1] 张搏宇[1] 苏宁[1] 吴娅妮[1] 杨鹏[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2015年第2期362-366,共5页Power System Technology

摘　　要：直流输电系统的内过电压主要通过金属氧化物避雷器（metal oxide arrester,MOA）加以限制,避雷器在内过电压下的保护特性对确定设备的操作冲击绝缘水平具有重要意义。根据±1 100 k V主回路接线、避雷器配置、交直流系统参数等,建立了±1 100 k V系统内过电压计算模型。对避雷器电压和电流波形进行仿真,对避雷器电流的波头时间进行统计。统计结果为：内过电压下通过避雷器电流的波头时间均不小于100μs,大于标准操作冲击电流的波头时间30μs,需要对较缓电流波头下避雷器的保护特性进行研究。为加以对比,对波形为316/814μs、30/60μs、8/20μs和1/4μs电流下的避雷器伏秒特性和伏安特性进行了试验研究。结果表明,同样电流下,1/4μs的伏安特性曲线高于8/20μs、30/60μs和316/814μs的曲线,而后三者的伏安特性曲线则区别不大;8/20μs、30/60μs和316/814μs的伏安特性相比,在0.1～1 k A电流范围内,30/60μs的伏安特性曲线比8/20μs和316/814μs的伏安特性曲线稍高。由于避雷器操作冲击电流的波头时间均不小于100μs,内过电压下避雷器取30/60μs电流波形下的伏安曲线是合适的,且是稍微偏严的。最后试验测试了避雷器电阻片在30/60μs操作冲击电流下的伏安特性。The internal overvoltage inside HVDC power transmission system is mainly restricted by metal oxide arrester （MOA）, so the protective characteristic of MOA under internal overvoltage is of significance to determine the switching impulse insulation levels of equipments. Based on the main circuit connection of ±1 100 kV UHVDC power system, the configuration of MOA, the parameters of AC and DC systems and so on, a model to calculate the intemal overvoltage inside ±1 100 kV UHVDC transmission system is established. The MOA voltage and the waveform of is current are simulated, and the statistics of the wave front times are performed. The results of the statistics show that under internal overvoltage the times of wave fronts passing through the MOA are not shorter than 100 ps and are longer than 30 ~ts, the wave front time of standard switching surge current, thus it is necessary to research the protective characteristic of MOA under the relatively slow wave front time of the current flowing through the MOA. To facilitate comparison, the test and the research on the volt-second characteristics and volt-ampere characteristics of MOAunder 316/814μs, 30/60 μs, 8/20 μs and 1/4 μs current waveforms are carried out. Research results show that in the plotted diagram, for the same current the position of MOA＇s volt-ampere curve under the 1/4 μs current waveform is above those of MOA＇s volt-ampere curves under the 8/20 μs, 30/60 μs and 316/814 μs current waveforms, and the differences among MOA＇s volt-ampere curves under the latter three current waveforms are not evident. As for MOA＇s volt-ampere curves under the latter three current waveforms, within the range of current from 0.1 kA to 1 kA, the MOA＇s volt-ampere curve under the 30/60 μs current waveform is slightly above the MOA＇s volt-ampere curves under the 8/20 μs and 316/814 μs current waveforms. Since the wave front times of switching surge currents passing through the MOA are not shorter than 100 μs, it is appropriate to take the volt-ampe

关 键 词：±1 100 kV直流输电 换流站 避雷器 伏安特性 伏秒特性 

分 类 号：TM86[电气工程—高电压与绝缘技术]