In the control system of the magnetic controlled reactor ( MCR) , it is necessary to sample the current and voltage in the grid .In view of the difficulty in accurately measuring high voltage and large current in real time , the design of the sampling of high voltage and large current in the power system was introduced in detail in this paper , and the ac sampling hardware solution based on DSP was proposed .At the same time , the phase compensation circuit and zero crossing detection circuit were designed , and the system test results of the circuits were provided .The results showed that the proposed scheme solved the sampling problems for voltage and current in the control system of MCR and the problem of datum point selection for the thyristor trigger signal .%在磁阀式可控电抗器控制系统中，需要对电网中的电压电流进行采样。针对目前难以实时精确测量高电压、大电流这一难题，详细介绍了电力系统中高电压采样和大电流采样的设计思想，提出了基于DSP的交流采样硬件解决方案。同时，设计了相位补偿电路和过零检测电路，并给出各电路的系统试验结果。结果表明该方案解决了磁阀式可控电抗器控制系统中电压、电流采样问题以及晶闸管触发信号的基准点选择问题。
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