Abstract There is a large amount of medium and low frequency noise in the interior certain vehicle type under constant speed driving conditions. Through identifying source, it determined that mainly caused by road noise. The suspension rubber bushing, mounting inching stiffness, body sheet metal are optimized, reduced 3 to 5 dB (A).

Oil-impregnated paper condenser transformer bushings are an important part of equipment, and partial discharge (PD) occurred when defects exist on the aluminum foil layers. Firstly, to study PD process oil-paper insulated capacitance graded bushing with defect broken foil, a defective sample is constructed parameters capacitance, carbonization traces at different voltage levels. Then, in order ...

Abstract This work expounds a case of insulation abnormality 220kV wall bushing end shield caused by the failure rubber seal gasket. The mechanism and causes were put forward combined with method on-site inspection, XRF analysis, infrared spectroscopy (IR) analysis thermogravimetric analysis. And suggestions for improvement sealing performance to prevent this kind defect management operation ma...