Automatic acquisition & test for grounding grid corrosion diagnosis

To reduce the manpower in grounding grids corrosion diagnosis, an automatic acquisition and test system is proposed, which consists of four parts, such as, the host computer, the intelligential DC current source, the intelligential digital voltage meter and the intelligential switching device. The steps to produce the complete test scheme is suggested, with the help of which, the DC current excitation positions and the voltage measurement positions of a complete test can be produced automatically. The process of the automatic acquisition and test controlled by the host computer is described. An experimental grounding grid with sixty branches is automatically tested based on the automatic acquisition system, the diagnosis results of which show the feasibility of the proposed approach.