煤矿井下绞车变频调速系统辐射电磁骚扰测试研究

Test study on radiation electromagnetic disturbance of frequency conversion speed control system applied to winch in underground coal mine

针对煤矿井下绞车变频调速系统辐射电磁骚扰问题,分析了变频调速系统的电磁兼容辐射发射限值以及井下测试环境和测试方法,并对井下绞车变频调速系统的电磁辐射进行了现场测试。测试结果表明:绞车变频调速设备辐射电场主要集中在200 MHz以内,尤其在20 MHz以内最为显著,辐射磁场主要集中在2 MHz以内,且低频段噪声突起分布尤为明显;在距离变频调速设备1 m处测量的辐射电场场强最大值达到122.97 d BμV/m;绞车电动机的辐射电场频谱达到1 GHz,辐射磁场主要集中在150 kHz以内,但总体辐射强度较低,在距离绞车电动机1 m远处测得的最大电场场强不超过80 d BμV/m。因此,绞车变频调速系统的电磁辐射骚扰较为严重,对井下辐射电磁环境影响较大,会对井下监测、监控设备以及控制系统造成干扰,需要采取一定的电磁辐射干扰抑制和屏蔽措施,尤其是在变频调速设备附近。

According to the radiation electromagnetic disturbance problems from the frequency conversion speed control and driving system of the winch in the underground coal mine,the paper analyzed the electromagnetic compatible radiation transmit limit of the frequency conversion speed control system as well as the underground mine test environment and test method. A site test was conducted on the electromagnetic radiation of the frequency conversion speed control system applied to the winch in the underground mine. The test results showed that the radiation electric field of the winch frequency conversion speed control system would be concentrated within 200 MHz,especially would be most obvious within 20 MHz,the radiation magnetic field would be concentrated within 2 MHz and the protuberance distribution of the low frequency sectional noise would be obvious. At a place with a distance of 1 m to the frequency conversion speed control equipment,the max value of the field strength in the measured radiation magnetic field was reached at 122.97 d BμV/m. The frequency spectrum of the radiation electric field in the winch electric motor was reached at 1 GHz,the radiation magnetic field was mainly concentrated within 50 k Hz,but the total radiation strength was low and at a place with a distance of 1 m to the winch motor,the filed strength of the measured max electric filed would not be over 80 d BμV/m. Therefore,electromagnetic radiation disturbance of the winch frequency conversion speed control system was quite serious,would have a high influence to the radiation electromagnetic environment in the underground mine and would have disturbances to the monitoring and control equipment as well as the control system in the underground mine.The certain electromagnetic radiation disturbance restrain and shielding measures should be needed and conducted especially the place near the frequency conversion speed control equipment.