Conventional tour inspection along transmission lines is insufficient to the detection of insulator breakage defect.This paper adopts new UV imaging method to simulate the breakages of suspension porcelain insulator string

porcelain insulator pole

and silicone rubber composite insulator on 110kV circuit

observes the UV images of the insulators with different breakage degrees and defect positions under different environment.The results show that UV imaging camera can detect some of the insulator breakage defects for preventing the circuits from early faults.