Experimental Study on the Influence of AC Stray Current on the Cathodic Protection of Buried Pipe

Table 1

The pipe-soil potential under different coating defect areas.

The defect area; (mm^2)	The maximum value of the moment interference (V)	The measuring protection potential without interference (V)	The real protection potential without interference (V)	The measuring protection potential with interference (V)	The real protection potential with interference (V)
50	−1.523	−1.000	−0.948	−1.034	−0.857
100	−1.282	−1.000	−0.955	−1.031	−0.842
200	−1.354	−0.998	−0.951	−1.030	−0.847
300	−1.302	−0.997	−0.956	−1.034	−0.795
400	−1.455	−0.992	−0.946	−1.020	−0.812
625	−1.298	−0.988	−0.952	−1.020	−0.834