Corrosion Analysis and Protection for Grounding Conductor in Transformer Substation

In the relaying protection of modern power grid system, the safety of grounding grid plays an important role. However, the equalizing voltage conductor has been serving in a complex soil for long time, which is prone to corrode and result in deterioration of electrical connection performance as well as decrease of current diffusion capacity, thus posing a great threat to the reliability of power grid system. Aiming at the corrosion problem of grounding galvanized steel in a 220kV transformer substation, the steel and corrosion products have been analysed by methods of morphology observation, energy spectrum analysis and metallographic examination. The corrosion causes of grounding conductor in transformer substation were studied. In addition, the advantages and disadvantages of using resistance-reducing agent, sacrificial anode method and conductive coating were introduced respectively.