| 摘要 |
A pipeline (1) buried in soil or in water is provided with equipment for cathodic corrosion protection (3). To compensate for, for example, potential variations along the pipeline caused by ground currents from d.c. plants, a circuit (4, 81, 82) insulated from ground is connected to the pipeline at two points (A, B). The circuit comprises a controllable current source (4). The potential difference in the ground between these points is determined, and the current source is controlled in dependence thereon such that a voltage drop is generated in the pipeline corresponding to the difference in ground potential. |
