What about screw extraction of ascending flange base of high voltage bushing of line reactor?
The vibration frequency of body is not in line with that of grading ring. Owing to the damping of transformer oil, grading ring has a low vibration frequency. And owing to single point welding and aluminum sheet welding, it has a poor mechanical strength. In the long-term operation, the vibration brought by the inconsistent vibration frequency of earth tag of line reactor (aluminum, welding) and grading ring causes metal fatigue and cracks. Solution: fix ascending flange base and body to reduce free-running vibration.
Loop current heating caused by flux leakage, design defects of high voltage outgoing line and surface oxidation of bolt heat the local eddy in single bolt weakening its mechanical strength. Solution: replace the fixed screw of ascending flange base with stainless steel screw to reduce the influences of flux leakage.