The communication cables for inspection robot would be heavily influenced by the electromagnetic produced by the power cable in the cable tunnel. Therefore

we studied the inductive coupling effects of the high-voltage power cable tunnel on communication lines according to the actual situation of cable tunnel. First

we studied the inductive coupling between single-wire power cable lines and communication lines as well as the inductive coupling between three-phase power cable lines and communication lines from the basic theory of the electromagnetic field; Then

we calculated and analyzed the risk impacts of the single power cable line and typical wiring mode three-phase power cable line to the communication cable line; Finally

taking the underground cable tunnels in Beijing for example

we proved the method to be correct by theoretically analyzing and field testing the inductive longitudinal electromotive force of communication lines. The results show that the inductive coupling effects caused by single power line to communication lines is larger

while the inductive coupling effects caused by the three-phase power lines to communication lines can be controlled within the allowable values of national standard. Thus

analyzing the inductive coupling between the two lines can provide the basis for the design of the communication line in cable tunnel

it has an important significance to the development of robot automation inspection for the cable tunnel.