| 引用本文: | 舒胜文,阮江军,黄道春,吴高波.系统故障参数对真空断路器开断性能影响的建模与仿真研究[J].电力自动化设备,2013,33(11): |
| SHU Shengwen,RUAN Jiangjun,HUANG Daochun,WU Gaobo.Influence of system fault parameters on breaking performance of vacuum circuit breaker：modeling and simulation[J].Electric Power Automation Equipment,2013,33(11): |
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| 摘要: |
| 建立了基于扩散型真空电弧开断的真空断路器黑盒模型。以电流过零点为界，针对燃弧阶段建立了电弧电压模型，并根据试验数据确定了相关系数；针对弧后介质恢复阶段建立了基于朗缪尔探针理论的弧后电流模型，不同瞬态恢复电压（TRV）上升率对应的仿真结果与试验结果一致。基于所建立的模型，采用不同的方法评估了短路电流直流分量造成的真空断路器等效开断能力下降倍数，结果表明：燃弧能量法进行评估时最苛刻，转移电荷法次之，电流有效值法最轻。采用弧后电导表征真空断路器的弧后介质恢复程度，结果表明：TRV上升率主要影响弧后1.5 μs以后的介质恢复速率，而过零前短路电流下降率仅影响初始弧后介质恢复速率。最后给出了部分系统故障参数对真空断路器开断性能的影响规律。 |
| 关键词: 断路器 开断性能 电弧电压 弧后电流 短路电流 直流分量 弧后介质恢复速率 建模 |
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| 基金项目:国家“十一五”科技支撑计划资助项目（2009BAA19-B05） |
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| Influence of system fault parameters on breaking performance of vacuum circuit breaker：modeling and simulation |
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SHU Shengwen, RUAN Jiangjun, HUANG Daochun, WU Gaobo
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School of Electrical Engineering，Wuhan University，Wuhan 430072，China
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| Abstract: |
| A black box model of vacuum circuit breaker is established based on diffuse vacuum arc interruption. With the current ZCP（Zero-Crossing Point） as demarcation point，the arc voltage is modeled for the arcing period and its related coefficients are determined according to the test data. The post-arc current is modeled for the post-arc dielectric recovery period based on the Langmuir probes theory. The simulative results for different rising rates of TRV（Transient Recovery Voltage） are consistent with the experimental results. Based on the built models，the equivalent breaking capability discount factor of vacuum circuit breaker caused by the direct current component of short circuit current is evaluated by different methods，which shows that，the arcing energy method is more rigorous than the transferred electric charge method while the latter is more rigorous than the current RMS value method. The post-arc conductivity is used to represent the dielectric recovery degree and results show that，the rising rate of TRV mainly influences the post-arc dielectric recovery rate after 1.5 μs while the decay rate of short circuit current prior to current ZCP only influences the initial post-arc dielectric recovery rate. The influencing rules of some system fault parameters on the breaking capability of vacuum circuit breakers are given. |
| Key words: electric circuit breakers breaking performance arc voltage post-arc current short circuit current DC component post-arc dielectric recovery rate model buildings |
