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Defects can come into being on the surface of stranded conductors, which will affect the corona onset voltage (COV) of conductors. To unveil the regularities of defects' impacts on the COVs, a series of AC corona tests of different defective conductors were carried out in a corona cage. Relationships between photon numbers and applied voltages were obtained using an UV imager, and COVs of stranded conductors with different defects were measured through photon number fitting method. Results show that relationships between photon numbers and applied voltages meet quadratic relationships in AC corona process. Different defects have different effects on COVs, among which broken strands influence COVs mostly. As the defect degree deepens, COVs decrease gradually. When the outmost layer's strands are all broken, COV increases rather than decreasing, which results from the increase of equivalent diameter of conductors at the broken points.

Study on the Effects of Defects on the AC Corona Characteristics of Stranded Conductors