The surge arrester with excellent protection characteristics would decrease the overvoltage level ap- plied on the power apparatus to reduce their insulation levels and manufacturing bottleneck. The arrester for the 1...The surge arrester with excellent protection characteristics would decrease the overvoltage level ap- plied on the power apparatus to reduce their insulation levels and manufacturing bottleneck. The arrester for the 1000-kV ultra-high voltage ac power transmission system is designed as tank-type structure. The field-circuit combination numerical method combining the three-dimensional finite element method with circuit is proposed to analyze the potential distribution of GIS arrester. By comparing several design schemes, the most effective method to improve the potential distribution along the varistor column is to increase the voltage gradient of the ZnO varistor. Synthesizing several influential factors, the suitable voltage gradient of ZnO varistor should be controlled to 435 V/mm, and the resulted nonuniform degree of the potential distribution along the varistor column inside the GIS arrester would be controlled smaller than 10%. The result in this paper provides the fundamental technical index for the study of the high voltage gradient ZnO varistors.展开更多
总结金属氧化物避雷器电气特性的考核指标体系:额定电压Ur、持续运行电压Uc、标称放电电流In、保护水平与绝缘配合系数Ks等,并基于不同的结构特征分别进行了说明。以10 k V配电系统为例,测算与校验了2种结构特征(无间隙与带串联间隙)金...总结金属氧化物避雷器电气特性的考核指标体系:额定电压Ur、持续运行电压Uc、标称放电电流In、保护水平与绝缘配合系数Ks等,并基于不同的结构特征分别进行了说明。以10 k V配电系统为例,测算与校验了2种结构特征(无间隙与带串联间隙)金属氧化物避雷器的主要特性参数;结合测算结果与实际工程案例,针对金属氧化物避雷器工作中发生爆炸等安全事故的原因进行分析,并提出了合理化建议,促进中压电力系统中金属氧化物避雷器的正确使用,并进一步提高对电气设备过电压的有效保护。展开更多
基金Supported by the National Nature Science Foundation of China (Grant Nos.50425721,5073001)the 11th Five-year National S&T Supporting Plan (Grant No.2006BAA02A16)
文摘The surge arrester with excellent protection characteristics would decrease the overvoltage level ap- plied on the power apparatus to reduce their insulation levels and manufacturing bottleneck. The arrester for the 1000-kV ultra-high voltage ac power transmission system is designed as tank-type structure. The field-circuit combination numerical method combining the three-dimensional finite element method with circuit is proposed to analyze the potential distribution of GIS arrester. By comparing several design schemes, the most effective method to improve the potential distribution along the varistor column is to increase the voltage gradient of the ZnO varistor. Synthesizing several influential factors, the suitable voltage gradient of ZnO varistor should be controlled to 435 V/mm, and the resulted nonuniform degree of the potential distribution along the varistor column inside the GIS arrester would be controlled smaller than 10%. The result in this paper provides the fundamental technical index for the study of the high voltage gradient ZnO varistors.
文摘总结金属氧化物避雷器电气特性的考核指标体系:额定电压Ur、持续运行电压Uc、标称放电电流In、保护水平与绝缘配合系数Ks等,并基于不同的结构特征分别进行了说明。以10 k V配电系统为例,测算与校验了2种结构特征(无间隙与带串联间隙)金属氧化物避雷器的主要特性参数;结合测算结果与实际工程案例,针对金属氧化物避雷器工作中发生爆炸等安全事故的原因进行分析,并提出了合理化建议,促进中压电力系统中金属氧化物避雷器的正确使用,并进一步提高对电气设备过电压的有效保护。
