一种改进的矿井区域选择性联锁保护方案设计

针对井下综保开关因生产厂家不同和型号不同而存在的保护响应时间长、响应时间不确定等问题,在分析传统区域选择性联锁保护方案的基础上,提出了一种改进方案:将智能控制模块的开关闭锁信号接口串联在综保开关的脱扣信号回路中,采用1∶1霍尔型电流传感器从原保护装置的电流互感器的副边取电流信号作为智能控制模块采集的信号,直接通过电流传感器检测故障电流,使得各级保护响应不受综保开关的影响。测试表明,改进方案中智能控制模块的响应时间为800μs,明显优于传统方案。

Design of an Improved Protection Scheme of Mine Zone Selective Interlocking

For problems that response time of underground integrated protection switches is long and uncertain because the switches are coming from different manufacturers and have different models,the paper proposed an improved protection scheme based on analysis of traditional protection scheme of zone selective interlocking: connect switch lockout signal interface of intelligent control module in tripping signal circuit of integrated protection switches in series,use 1:1 Hall-type current sensor to obtain current signal from secondary side of current transformer of the original protective device,and take the signal as acquisition signal of the intelligent control module.The scheme detects fault current through current sensor directly,which avoids protection from impact of integrated protection switches.The testing result shows that the intelligent control module in the improved scheme has response time of 800 μs,response speed is significantly improved compared with the traditional scheme.