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1.前言煤矿地下电气作业会在其周围局部地区造成一定的电磁干扰,但是对其影响程度目前尚未进行过较深入的分析和讨论。1970年宁夏石咀山市党校测点的大地电磁观测中曾发现过这种干扰,结果使该测点工作无法进行。1979年在甘肃山丹邮电农场测点亦发现此种干扰。1986年4月在山丹南湾测点上又发现了这种干扰。我们针对这种典型的场源背景,经过数百
1. Introduction Underground electrical work in coal mines will cause some electromagnetic interference in some areas around them, but the extent of their impact has not been analyzed and discussed in more depth at present. In 1970, the electromagnetic observation of the Shizuishan Party School in Ningxia had found such interference and the result was that the work of the measuring point could not be carried out. In 1979, Gansu Shandan Post and Telecommunications Farm measuring point also found such interference. This interference was found again at the Shandanan Bay measuring point in April 1986. We address this typical background of the field, after hundreds