我厂自制一台1.5吨工频无芯感应电炉炼钢。炉衬采用镁砂加卤水打结而成。为了防止炉衬被钢水破坏后到达线圈造成事故,我们装设了安全保护系统。该系统其原理是,在炉衬两侧安装两个电极,测量两电极间的电阻来观察炉衬情况。当电阻减少时说明炉衬薄了,当阻为零时说明钢水已经穿透炉衬,这时自动发出报井信号。我们在使用过程中曾有一次电阻值突然为零报警,经停炉倾出全部钢水检查,发现炉衬有手掌大的一个洞,钢水已经穿过了钢板,并破坏了感应线圈的绝缘,感应线圈的局部地方表面已经熔化,情况非常危险,只是由于装设了炉衬的测量回路——报警系统,监测了炉衬电阻的变化情况,才避免了钢水破 I plant a 1.5 ton frequency coreless induction furnace steelmaking. Lining with magnesia and brine knot made. In order to prevent the lining from being destroyed after the molten steel reaches the coil and cause an accident, we have installed a safety protection system. The principle of the system is to install two electrodes on both sides of the lining and measure the resistance between the two electrodes to observe the lining. When the resistance decreases when the lining is thin, when the resistance is zero when the molten steel has penetrated the lining, then automatically send a signal well. We used to have a sudden zero resistance alarm, pouring out all the molten steel through the shutdown inspection and found that the lining has a large palm hole, the molten steel has passed through the steel, and destroyed the induction coil insulation, induction coil Of the local local surface has been melted, the situation is very dangerous, but due to the installation of the lining of the measuring circuit - alarm system, monitoring the changes in lining resistance, to avoid the molten steel is broken