Research on Transient Characteristics of Secondary Arc Current of Ultra High Voltage Transmission Lines
Sun Qiuqin1 ,Wang Feng1 ,Liu Yang2, Zhou Zhicheng2
1.School of Electrical and Information Ehgineering Hunan University Changsha 410082 China 2. Jiangsu Electric Power Company Research Institute Nanjing 211103 China
Abstract：The ssecondary arc is a type of long air gap AC arc burning in free space,whose arcing time is closely related to its current.This paper mainly focuses on the characteristics of the transient secondary arc current.Firstly,the current contains two parts,i.e. the natural component and the forced component,and the corresponding equivalent circuit models are developed respectively.Then,a series of simulations are carried out using EMTP.The results indicate that the secondary arc current can be divided into three stages based on their different characteristics.During the early stage,the current decays and oscillates drastically.Due to a great proportion of DC component in the middle stage,the current decays slowly and the zero-crossing time of the current is delayed.During the final stage,the current is mainly dominated by its forced component.The natural component mainly determines the transient secondary arc current process.In order to elucidate the mechanism of the transient of secondary arc current,the influences of the key factors,i.e. secondary arc resistance,shunt compensation degree,neutral reactor,and fault location,on the transient of secondary arc current are investigated in detail.Based on the equivalent impedance network together with the Laplace transform method,the formula for the oscillation frequency and the decay factor of the natural component as the functions of the system parameters are deduced.Both the simulation and the theoretical analysis show that the secondary arc resistance dominates the decay of the free component.Higher arc resistance can accelerate the decay of the free component and lead to shorter arcing time.
孙秋芹,汪沨,刘洋,周志成. 特高压输电线路潜供电流的暂态特性研究[J]. 电工技术学报, 2016, 31(3): 97-103.
Sun Qiuqin ,Wang Feng ,Liu Yang, Zhou Zhicheng. Research on Transient Characteristics of Secondary Arc Current of Ultra High Voltage Transmission Lines. Transactions of China Electrotechnical Society, 2016, 31(3): 97-103.
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2016, Vol. 31 
