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由大量的测试数据得知,井下直流杂散电流主要来源于架线电机车的牵引轨道。轨道同架线一样都是作为载流体利用的。但由于轨道是铺设在巷道的底板上,再加上铁的较高的电阻率和轨道接缝处无电气连线,因此造成轨道压降很大,实测我矿轨道压降有的高达80—90V。这就使轨道中的大部分电流进入与轨道并联土壤中,形成了杂散电流。实测我矿有些运输水平的杂散电流占负荷电流的60％。不过轨道中的电流向大地泄漏是有其一定规律的。下面就图1的供电系统来
It is known from a large amount of test data that underground DC stray current mainly comes from the traction track of overhead locomotives. The rails are used as a carrier fluid just like the rails. However, the track is laid on the floor of the roadway, coupled with the high resistivity of iron and track joints without electrical connection, resulting in a large rail pressure drop, and some of my ore rail pressure drop as high as 80- 90V. This allows most of the current in the orbit into parallel with the orbital soil, creating a stray current. Some mine transport measured stray current account for 60% of the load current. However, the current in the track to the earth has its own law of leakage. Below to the power supply system in Figure 1