油流继电器（流量指示器）是显示变压器强迫油循环冷却系统内油流量变化的装置。用来监视强油循环冷却系统的油泵运行情况，如油泵转向是否正确，阀门是否开启，管路是否有堵塞等情况，当油流量达到动作油流量或减少到返回油流量时均能发出报警信号。 系列产品型号：BLZ(YJ)-50/80/100/125/150。 【Application The oil flow indicator is a kind of device used for indicating the quantity of Oil flow in the transformer cooling system with forced oil circulation and supervising the operation situation of oil pump of cooling system with forced oil circulation, such as whether the rotation direction of oil pump is correct, the valve is opened, the conduit is blocked, etc .The indicator can initiate the alarming signal when the quantity of oil flow increases to the action oil flow quantity or decreases to the return oil flow quantity. TYPE:YJ-50/80/100/125/150】