Electric Power ›› 2018, Vol. 51 ›› Issue (12): 95-100.DOI: 10.11930/j.issn.1004-9649.201804074

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Comparative Analysis on PA and UT Technologies in Defect Detection Rete of Gas-insulated Enclosed Electrical Equipment Enclosure

QIAO Yaxia1, LUO Hongjian2, ZHANG Pengfei1, ZHANG Hao1   

  1. 1. China Electric Power Research Institute, Beijing 100055, China;
    2. State Grid Zhejiang Power Supply Company, Hangzhou 310014, China
  • Received:2018-04-17 Revised:2018-08-01 Online:2018-12-05 Published:2018-12-13
  • Supported by:
    This work is supported by Science and Technology Project of SGCC(Research on Welding Technology and Joint Integrity Evaluation Technology for UHV GIL Long Pipes, No.JZB11201801751).

Abstract: Based on the test and simulation analysis of aluminum shell defect specimens, three methods of phased array inspection (PA), conventional ray test (RT) and conventional ultrasonic testing (UT) for welding seam detection of aluminum shell of the gas-insulated transmission lines were studied and compared. The test results show that the detection rate of UT and PA is superior to that of RT for face-type defects with greater hazards.Phased array detection (PA) is easier to detect the best angle of defects, has a higher detection rate for hazardous defects. Moreover, PA can obtain more information of defect feature. The test results provide a basis for the non-destructive testing process of gas insulated transmission line (GIL) shell in Sutong pipeline corridor project.

Key words: transmission line, GIL, aluminum housing, PA, RT, UT, defect detection rate

CLC Number: