随着电力系统的不断完善，为了提高系统的稳定性以及增加输电线路的传输容量，串联电容补偿器被广泛应用。单相重合闸是电力系统保证供电连续性，提高线路可靠性的重要手段。潜供电弧的快速熄灭是保证单相重合闸在串补系统中成功合闸的关键，但由于串补装置的存在，使得串补系统中潜供电弧的熄灭变得比常规无串补系统中更为复杂，需要研究解决一系列问题。 本文研究了各种因素对串补系统中潜供电流和恢复电压的影响；对串补系统中的潜供电流和恢复电压的稳态、暂态进行了分析研究，提出了在串补系统中熄灭潜供电弧的方法。主要研究内容如下： 串补的引入对输电线路的电气参数影响很大，本文详细的论述了串补装置导致线路的过电压、潜供电流、断路器暂态恢复电压（TRV）及次同步谐振（SSR）等问题，避免建立超高压串补输电线路时参数的设置错误。同时潜供电流是决定潜供电弧能否自熄的重要因素，接地电阻阻值的确定对潜供电流的计算起着重要的作用。利用戴维南定理，本文详细分析了在有、无并补的输电线路中接地电阻阻值对弧道中潜供电流的影响。 通过EMTP仿真和和功率谱分析发现，在无并补的串补系统中，潜供电流含有低频分量；在串并补系统中，潜供电流也含有低频分量、而恢复电压则出现了“拍频”现象。通过拉普拉斯变换，本文对串并补系统的潜供电流和恢复电压的频域特性进行了分析，从理论上解释了上述现象的原因。 在串并联补偿系统中，为消除低频分量的影响，采用旁路故障相串补方法，但潜供电流中直流分量却增加了，同时在某些情况下，故障时直流分量本身就很大，故提出采取一定数值的电阻短接故障相串补，配合并联电抗器中性点加小电抗的方法来熄灭潜供电弧，理论分析表明，该方法在消除潜供电流和恢复电压中低频分量的同时，还能加快潜供电流中直流分量的衰减。

With the improving of power system, series capacitor compensator is widely used to improve the system stability and increase transmission capacity of power lines. Single-phase reclosing is an important means in power system to ensure continuity of power supply and improve the circuit reliability. Rapid extinction of secondary arc is the key in making single-phase reclosing successfully in series compensation system, but because of the existence of series compensation device, the extinction of secondary arc in series compensation system are more complex than conventional series compensation system, thus a series of problems need to be studied and solved. Various influence factors of secondary arc current and recovery voltage in series compensating system are studied in this paper; both steady state and transient state of the secondary arc current and recovery voltage are analyzed, methods of secondary arc extinction in series compensation system are proposed. The main research contents are as follows: Adding series compensation will make great effect on the electrical parameters of the transmission lines, the problems caused by series compensation device are discoursed in this paper, such as line overvoltage, secondary arc current, transient recovery voltage of circuit breaker (TRV) and sub synchronous resonance (SSR), etc. thus to avoid errors in setting parameters when building EHV series compensated transmission lines. Meanwhile, the secondary arc current is an important factor in determining whether secondary arc can self-extinguishing, the determine of grounding resistance plays an important role in calculation of secondary arc current. According to Thevenin theorem, the influence of value of the grounding resistance on the secondary arc current in transmission lines is analyzed in this paper. According to analysis of EMTP simulation and power spectrum, the secondary arc current will generate low frequency component under certain conditions in series compensation system without pararell compensation; the secondary arc current will generate low-frequency components, as well as recovery voltage will generate low frequency component and the phenomenon of "beat frequency" in series compensation system with pararell compensation. By using of Laplace transform, the frequency characteristics of secondary arc current and recovery voltage in series-parallel compensation system are analyzed, so as to explain the above-mentioned phenomenon in theory. In the series-parallel compensation system, a method of adopting bypassing the series compensation in fault phase are used to eliminate the influence of low frequency component, but the direct current component will increase in secondary arc current, in some cases, the value of direct current component itself is great, thus the certain resistances are used to short circuit with fault phase as well as the small reactance are used in neutral point of shunt reactors, so as to extinguish the secondary arc current, theoretical analysis have shown that this method can not only eliminate low frequency components in the secondary arc current and recovery voltage but also accelerate the reduction of direct current component in secondary arc current.