研究了冲击电流波形对开关型电涌保护器（SPD）的工频续流的影响。
The influence of impulse current waveform on 50 Hz continuous current of switching type surge protective device(SPD) was studied.
试验研究证实：氧化锌限流元件串联放电间隙能够在断路器动作之前，快速截断工频续流。
The test results in this paper show that ZnO arrestor unit with a series gap for transmission lines is able to cut off power frequency current quickly before the circuit breaker operate.
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