CAJ | 학술논문

为消除硅橡胶复合绝缘子缺陷对电网安全运行造成的隐患,提出了一种利用超声波探伤仪检测硅橡胶绝缘子护套脱粘和气孔缺陷的方法,该方法根据0.5～10 MHz的超声波在不同介质中传播时的异质界面回波特性判定绝缘子缺陷.研究表明,在全检波、正检波、负检波、射频波4种超声检波方式中射频波方式优于其它方式.用压电晶片、透声层、硅橡胶护套3种介质实测表明:当透声层厚度等于1/4波长时形成声阻抗匹配而产生全透射并达到最优检测效果;对绝缘子大面积护套脱粘采用射频幅度法检测,对绝缘介质气孔、夹渣采用射频反射法检测方式.该方法为复合绝缘子内部缺陷检测提供了一种有效手段.
위소제규상효복합절연자결함대전망안전운행조성적은환,제출료일충이용초성파탐상의검측규상효절연자호투탈점화기공결함적방법,해방법근거0.5～10 MHz적초성파재불동개질중전파시적이질계면회파특성판정절연자결함.연구표명,재전검파、정검파、부검파、사빈파4충초성검파방식중사빈파방식우우기타방식.용압전정편、투성층、규상효호투3충개질실측표명:당투성층후도등우1/4파장시형성성조항필배이산생전투사병체도최우검측효과;대절연자대면적호투탈점채용사빈폭도법검측,대절연개질기공、협사채용사빈반사법검측방식.해방법위복합절연자내부결함검측제공료일충유효수단.
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-Transparentlayer 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.