摘要
为进一步理解真空断路器开断过程中的电流零区现象,仿真分析了真空断路器开断短路故障和切除电容器组时瞬态恢复电压(transient recovery voltage,TRV)和弧后电流的相互作用。在PSCAD/EMTDC中建立了基于Langmuir探针理论的真空断路器弧后电流仿真模型,仿真结果和试验结果相符,验证了模型有效性。仿真结果表明:开断短路故障时,是否考虑弧后电流对TRV没有明显的影响,弧后电流大小则与TRV上升率成正比;切除电容器组时,弧后电流对起始TRV有显著影响,但对工频恢复电压没有影响。此外,短路类型、短路点位置、短路合闸相角、系统等效电感、电容等网络参数对TRV和弧后电流也有很大影响。研究成果有助于分析不同工况下真空断路器面临的开断考验。
For further understanding the current zero phenomenon in the interruption process of vacuum circuit breakers （VCB）, through simulations, we investigated the interactions between transient recovery voltage （TRV） and post arc cur rent when a VCB interrupts short circuit fault and capacitor bank, and established a model of post arc current by the theory of Langmuir probes in the software PSCAD/EMTDC, which was proved to be valid since the calculation results agreed well with experimental results. The calculation results show that when a VCB interrupts a short circuit fault, TRV is hardly affected whether post arc current is taken into consideration or not, yet post arc current is proportional to the ris ing rate of TRV. However, when a VCB interrupts a capacitor bank, the post arc current influences the initial TRV remarkably but has no influence on the powerfrequency recovery voltage. Moreover, network parameters including type, position and phase angle of short circuiting, equivalent inductance, and capacitance also influences the TRV and post arc current obviously. The obtained results could help to analyze the capability challenge of a vacuum circuit breaker under different operating conditions.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第1期309-316,共8页
High Voltage Engineering
基金
国家"十一五"科技支撑计划(2009BAA19B05)~~
关键词
真空断路器
瞬态恢复电压
弧后电流
离子浓度
短路
电容器组
vacuum circuit breaker
transient recovery voltage
post arc current
ion density
short circuit
capacitor bank
