Abstract: Aiming at the problem that the leakage of laboratory instruments and equipment threatens the personal safety of operators, this study designed a safety detector based on AT89C52 microcontroller. In the system the leakage protection principle was taken as the main research object, the high-precision monitoring unit was composed of single-chip microcomputer and highly integrated circuit, and the human-computer interaction interface was realized by LABVIEW. Through the application and test on the seed belt knitting machine, it is concluded that the system has stable performance and can realize corresponding functions.

Key words: safety, leakage, zero sequence current