摘要:
通过对煤矿井下中央变电所电磁环境进行测试分析,得出如下结论:(1)中央变电所设备正常运行时,高压开关附近存在低频干扰;(2)中央变电所变压器正常运行时,干扰主要在500 MHz以下,在100 MHz附近产生较大干扰,产生的最大干扰比背景噪声高出40 dB.μV/m左右;(3)中央变电所内开关闭合瞬间会产生较大的电磁干扰,干扰主要在1.5 GHz以下,低频干扰较大,最大值达到193 dB.μV/m;(4)中央变电所设备正常工作时,辐射电磁场达到一级标准(1 V/m);但在开关闭合瞬间,在1 MHz以下电磁干扰较大,超过GB9175—88环境电磁波卫生标准中规定的二级标准。
关键词:
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矿井
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中央变电所
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电磁环境
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电磁干扰
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测试
Abstract:
Through testing and analyzing electromagnetic environment of central substation of coal mine underground, following conclusions were gotten: 1 There is low-frequency interference nearby high-voltage switch during normal operation of equipments in central substation. 2 When transformers of center substation run normally, the EMI is mainly below 500 MHz and a greater interference appears nearby 100 MHz, and the maximum interference is 40 dB?μV/m higher than background noise or so. 3 When the switch in central substation is taken on or off instantly, there will be a greater EMI which is mainly below 1.5 GHz. The larger interference is in low-frequency and the maximum EMI reaches 193 dB?μV/m. 4 When equipments of central substation are in normal working, radiation of electromagnetic field reaches 1 standard level 1 V/m. But when the switch is taken on or off instantly, the EMI is larger than 2 stardard level of GB9175-88 environmental health standards of electromagnetic waves because the EMI is larger below 1 MHz.
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