Mechanism Analysis of Insulator Fault in Enclosed Isolated Phase Bus Caused by Vibration
摘要
The conductor and shell of an enclosed isolated phase bus will be subjected to alternating electromagnetic forces, bring by alternating magnetic field environment, which causes a long time vibration. The insulator that supports these two parts may become damaged or loose under this vibration environment, which can cause some faults. In this paper, the insulator failure into air gap fault and crack defect, to reveal the mechanism of insulator failure caused by bus vibration. Through theoretical analysis and finite element simulation, the different stress and deformation manifestations of insulators under normal state, air gap and crack faults are analyzed. Thus, the influence of internal electric force on faulty insulators in isolated phase enclosed bus is revealed. The impact of air gap and crack faults on insulators should receive more attentions.