电控箱是煤炭部“七五”重点科研攻关项目全液压钻装锚机组配套的子项目。文中介绍了其控制电路和保护电路的设计原理和要点,提出用三次谐波识别电动机过载、短路和断相故障的技术途径,验证了其可行性。型式试验和随主机工业性试验表明,电控箱运行正常、可靠。 Electric control box is the coal ministry “seven five ” key scientific research project full hydraulic drilling anchor unit supporting sub-project. The design principle and key points of the control circuit and the protection circuit are introduced in this paper. The technical approach of identifying the overload, short circuit and phase failure of the motor by the third harmonic is proposed, and its feasibility is verified. Type test and with the host of industrial tests show that electric control box is operating normally and reliably.