一种矿用低压馈电开关综合保护系统

An integrated protection system for mine-used low-voltage feed switch

设计了一种基于STM32F407芯片的煤矿井下馈电开关保护系统,系统具有漏电、过流、短路等保护功能。系统设计运用模块化的设计方法,结合目前煤矿井下各种保护方法的优点和不足,针对煤矿井下的漏电、短路及过载的不同特点,分别采用不同的检测方法,例如针对三相短路故障系统采用鉴幅检测与相敏检测相结合的方法,针对异步电机及线路的断相和相间短路采用负序检测的方法,在过载保护方面将定时限保护与反时限保护曲线结合。对井下不同的电压等级给出各保护模块具体的参数整定值,实验验证了系统的可靠性和稳定性。

A feed switch protection system in the coal mine based on STM32 F407 chip is designed. The system has protection functions such as leakage, overcurrent, and short circuit. The system design uses a modular design method, combining the advantages and disadvantages of various current protection methods in coal mines. According to the different characteristics of leakage, short circuit and overload in coal mines, different detection methods are used, such as three-phase short circuit protection. The system uses a combination of amplitude detection and phase-sensitive detection. It uses negative sequence detection for asynchronous motors and lines for phase failures and phase-to-phase short circuits. In terms of overload protection,the definite-time protection and the inverse-time protection curve are combined. Different voltage levels give specific parameter setting values for each module. Experiments verify the reliability and stability of the system.