Analysis of the fracture defect of the fixed plate of the 110kV oil oil casing pressure equalizing cover together

Abstract: In this article, the author introduces the fault analysis and handling process of a 220kV transformer running indoors during live detection, which found that the ultrasonic signal inside the medium voltage cable compartment exceeded the standard defect. The fault location and cause were identified, and on-site solutions were proposed.

Keywords: transformer; Oil oil casing; Live detection

(a)Ultrasonic testing results in continuous mode

(b)Ultrasonic detection results in phase mode

(c)Ultrasonic testing results in flight mode

(a)Connection method of pressure equalization cover and sleeve lead joint

(b)Pressure equalizing cover fixing plate

(c)There are cracks in the fixing plate of the pressure equalization cover

(d)Fracture surface of pressure equalization cover fixing plate

Fixed plate structure of pressure equalization cover

Force analysis of the fixing plate of the pressure equalization cover during fastening

Comparison of new and old pressure equalization cover fixing plates

Fracture pressure equalization cover fixing plate

Newly installed pressure equalization cover fixing plate