| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress temperature rise of a concrete base and machines by providing a conductor forming a closed circuit along a conductive tank, an earth wire and an earth mesh thereby reducing the induction current flowing through the earth wire and the earth mesh and the eddy current being induced in the tank. SOLUTION: End part of a conductive tank 1 is connected with a mesh wire 5 formed by burying earth wires 6a, 6b in concrete. Furthermore, a conductive dummy circuit 7 is provided along a closed circuit of the tank 1→the earth wire 6a→the earth mesh 5→the earth wire 6b. When an AC current is fed in the direction of arrow 8 through a conductor 2, for example, a leakage flux is generated in the direction of arrow 9 on the outside of the tank 1 and an induction current flows in the direction of arrow 10a. At the same time, the leakage flux 9 generates an induction current in the dummy circuit 7 in the direction of arrow 10b. When the AC current being fed through the conductor 2 is constant, the induction current flowing through a closed circuit of the tank 1, the earth wires 6a, 6b and the earth mesh 5 can be reduced by the dummy circuit 7.</p> |
