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本文介绍了相敏过流保护的原理并利用80C552单片机和可编程外图接口芯片PSD301对相敏过流保护器进行了设计，现场运行表明，准确可靠，动作良好。
In this paper, the principle of phase sensitive overcurrent protection is introduced and the phase sensitive overcurrent protector is designed with 80C552 single chip microcomputer and programmable external interface chip PSD301. The field operation shows that it is accurate and reliable and works well.