| 摘要 |
An apparatus for detecting a defect in an insulator formed therein with an axially extending hollow section; having a hold section 2 for holding the insulator, a first electrode 3 inserted in the hollow section 1a of the insulator 1, and a second electrode provided outside of the insulator 1. An electric discharge structure 10 produces an electric discharge between the first and second electrodes 3, 5, a path recognizes 11, 12, 13 for recognizes whether the electric discharge passes through a predetermined path, and a discriminating structure 14 for discriminates whether the insulator 1 is satisfactory, in accordance with a signal from the path recognizes.
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