一、概述在煤矿中,卸载滚筒速度为70～150r/min的胶带输送机系统内,可选用本继电器作为低速和断带保护之用。在其它有相同技术要求的系统中,亦可选用。实践证明,基于失落脉冲检出原理所设计的速度继电器,如欲在比较大的范围内整定继电器的动作转速值是有一定困难的,准确的动作转速值在继电器上亦无法标定。另外,在电压波动(煤矿系统规定75～105％额 First, an overview In coal mines, unloading drum speed 70 ~ 150r / min tape conveyor system, the relay can be used as a low speed and broken belt protection purposes. In other systems with the same technical requirements, can also be used. Practice has proved that based on the principle of lost pulse detection designed speed relay, if you want to set the relay in a relatively large range of operating speed value is a certain difficulty, the exact value of the operating speed relay can not be calibrated. In addition, the voltage fluctuations (coal mining system provisions 75 ~ 105% of the amount