The recognition of the creepage discharge development process oil–paper insulation under AC–DC combined voltage is basis for fault monitoring and diagnosis converter transformers; however, only a few related studies are available. In this study, with ratio 1:1 was used to develop method an cylinder–plate electrode structure. First, pulse current collect signals in process. Then, 24 characterist...

This paper aimed to investigate the wear properties of different wheel-rail material pairs with various hardness values. Twin-disc experiments were carried out via cross-matching five types wheel (ER7, ER8, CL60, C-class and D-class) four rail (U71Mn, U75V, PG4 PG5). The effects bulk hardness, post-test hardening ratio, rail/wheel ratio (HR/HW) on rate materials analyzed. results indicated that...

Received Jul 10, 2017 Revised Oct 14, 2017 Accepted Oct 26, 2017 Overhead line insulators can be damaged for various reasons during their service life. Porcelain or glass insulators once damaged can affect the reliability of power system networks. This paper presents the study of voltage and electric characteristics along the surface of a broken porcelain insulator located in a string of 10 uni...

Abstract This article presents the application and evaluation of a cantilever with integrated sensing actuation as part an atomic force microscope (AFM) adjustable probe direction, which is into nano measuring machine (NMM-1). The AFM, operated in closed-loop intermittent contact mode, based on two rotational axes that enable adjustment direction to cover complete hemisphere. greatly enlarge me...

Lubrication is widely used to reduce wear of wheel and rail profiles by decreasing the friction between flange rail. The effects lubrication on dynamic response were investigated in this study, analysing responses adjoining bearing housing. experiments conducted a 1/3rd scale twin disc rig, with single disc, which can have various speeds, loads creepage. First, theoretical modal parameters calc...