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《High Voltage Engineering》 2009-10
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Application of Ultrasonic Flaw Detector to Internal Defects in Composite Insulators

XIE Cong-zhen1,ZHANG Yao1,HAO Yan-peng1,YUAN Xue-jun2,WEI Qiang-hua3(1.Electric Power College,South China University of Technology,Guangzhou 510640,China;2.Wuhan Zhongke Innovation Technology Co.,Ltd.,Wuhan 430079,China;3.Dongguan Gaoneng Electric Co.,Ltd.,Dongguan 523012,China)  
In order to eliminate the danger for the safe operation of composite insulator,this paper presented one method to detect the flaw of the bonding between sheath and rod by using the ultrasonic flaw detector.This method determines the flaw on the base of the echo quality of the ultrasonic wave with 0.5~10 MHz in different material.Much research indicated that the method of radio frequency detection was better than the methods of full detection,positive detection and negative detection.Test results for three materials of piezoelectric chip,Sound-Transparent-layer and silicone rubber sheath demonstrate that full transmission was occur by the matching of the acoustic impedance when the thickness of the Sound-Transparent-layer is one quarter of the wave.The method of the radio frequency wave amplitude was used to detect the large area bonding between housing and core.The other method by the echo of the radio frequency was used to detect the bubble and the dregs in the insulation material.It is an effective non-destructive technology for detecting the inner defects of composite insulator.
【CateGory Index】: TM216.3
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