The grounding grid of traction substation is within the influence scope of the integrated grounding system for high-speed railway

and the measurement of its grounding impedance is bound to be influenced by the integrated grounding system for high-speed railway

therefore

it can not simply copy the grounding impedance measurement method of power system grounding device. Based on the CDEGS software

we established a calculation model of the grounding impedance of grounding grid in traction substation in the existence of integrated grounding system for high-speed railway

and analyzed the influence of the integrated grounding system for high-speed railway on the ground potential rise distribution of traction substation grounding grid under a homogeneous soil resistivity. Thereby

the simulation model of grounding impedance measurement of grounding grid in a traction substation was established in the presence of integrated grounding system for high-speed railway. We also analyzed the accuracy of measuring the grounding impedance of traction substation by an angle measurement method under different electrode arrangements and different current electrode distances

and performed the field tests. The simulation calculation and the field measurement show that the existence of integrated grounding system for high-speed railway reduces the influence scope of the grounding grid of traction substation

and seriously affects the accuracy of the angle measurement method for measuring the grounding impedance of traction substation. Reasonable arrangements of current electrode and voltage electrode can reduce the influence of integrated grounding system for high-speed railway on grounding impedance measurement of traction substation grounding grid

and a 30-degree-beyond angle method is suitable for the grounding impedance measurement of the grounding grid in traction substation in the existence of integrated grounding system for high-speed railway.