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煤矿井下采用专用电力电缆供电,供电电压等级比较高,其电磁辐射对机电设备和工人身体健康均有一定影响。文章使用有限元方法对矿用6 000 V屏蔽和非屏蔽电缆的工频电场、磁场的辐射情况进行了分析。数值计算结果表明,工频电场使用非屏蔽矿用电缆情况下在测试点可达到281 V/m,使用屏蔽矿用电缆后变为0.007 V/m。工频磁场则为0.3 uT,且与屏蔽层关系不大。
Coal mine power supply using special power cables, power supply voltage level is relatively high, the electromagnetic radiation on the mechanical and electrical equipment and workers have a certain impact on the health of patients. The article uses the finite element method to analyze the frequency field and magnetic field radiation of 6 000 V shielded and unshielded cables for mining. The numerical results show that the power frequency electric field can reach 281 V / m at the test point using the unshielded mine cable and 0.007 V / m after using the shielded mining cable. Power frequency magnetic field is 0.3 uT, and has little to do with the shield.