Polymeric insulators need proper management and maintenance. Without proper management, the electric devices can be affected by factors such as leakages in the electricity system. In outdoor insulation, the environment subjects the material to a variety of stresses simultaneously that can lead to rapid degradation and loss of the insulation properties. Contamination of the surface of the insula...

The outdoor insulators in service are exposed to marine, agricultural waste and industrial pollution. These pollutants get deposited on the insulator surface lead flashovers under fog conditions. There has been an abnormal increase pollution levels due rapid industrialization past two decades. This exponential causes frequent of insulators, leading tripping transmission lines consecutively may ...

In this paper, the dynamic behaviour of a rail vehicle with single-wheel drive and brake modules is analysed. It is shown that in the wheelslide or wheelskid case, the linearised plant obtains an unstable pole whose location is determined by the shape of the current creep force curve. By considering possible variations in the shape of the creep force curve, the corresponding variation of the po...

Lichtenberg discovered dust figure phenomena of electrical discharges in 1777. His discovery came to the notice of many scientists because it was considered that the figures should show the motion of the electric fluid. Photographic Lichtenberg figures were obtained in the middle of the nineteenth century. Both of these figures, usually called "Lichtenberg figures", have been utilized in the st...

Twin-disc tests present some limitations for wheel-rail wear characterization such as the obtained contact patch and error very low creepages. In this work, creepage phenomena are investigated ranging from 0.12% to 2.45%. To improve fitting of experimental with theoretical adhesion curve, a modification FASTSIM algorithm is proposed. A linear correlation has been found between slip area includi...

The problem of a wheel under tractive rolling Carter is revisited here by assuming slip-dependent friction force. By change from static to dynamic coefficient occurs over small distance, we develop effectively fracture mechanics solution for the shear tractions, which describes some aspects “falling friction” creepage forces are commonly observed experimentally. Possible agreement with experime...