Influence of Stray Current on Corrosion in Substation Grid

Stray current in an ultra high voltoge(UHV) substation was monitored by the detection technique of soil voltage gradient and continuous monitoring of pipe-soil potential. The results show that the effect of stray current was in moderate intensity. The results also indicated that the stray current was not related to the voltage classes of the substation, but to the running status, design and install technology of electrical equipments.