As China's economic development, social demand for electricity continues to increase, while the primary energy to the unbalanced distribution of electricity load centers resulted in our country needs long-distance, high-capacity transmission. To improve power quality, series capacitor com- pensation as a relatively mature technology, improve power quality, an important means to solve the problem of low voltage. Compensation capacitor in series access undermine the uniformity of the transmission line impedance, change the distribution system each point current and voltage, so bring some impact on transmission line protection.%随着我国经济的发展，社会对电力的需求不断增加的同时，对电压质量的要求也逐渐提高。近年来我国长线路重负荷造成的线路末端低电压、电压波动大等电压质量问题非常严重，为提高电压质量，串联电容补偿技术作为一项相对成熟的技术，是提高电压质量，解决低电压问题的重要手段。而串联补偿电容的接入破坏了输电线路阻抗的均匀性，改变了系统中各点电流与电压的分布，因此会对输电线路的继电保护带来一定的影响。
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