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This investigation aimed to study the passivation and corrosion performance of sandblasted steel in a concrete environment. The surfaces of the steel specimens were modified using sandblasting method for three durations: 5, 10, and 15min. The specimens were immersed in the chloride-free concrete pore solution for 14days and then 3% by weight of chloride ions were added to the solution. The specimens...
In this paper, direct current (DC) surface flashover characteristics of modified polyimide (PI) are studied in vacuum (10−4Pa). Two kinds of semi-conductive powders (nano scale, micro scale) are used as modifier of raw PI. Meanwhile, the surfaces of flashover experimented samples are observed using scanning electron microscopy (SEM), and the influence of the secondary electron emission (SEE) coefficient...
The volume resistance of RTV silicone rubber was adjusted by adding conductive fillers. By applying RTV silicone rubber with different conductivities to the different parts of an insulator, the electric field distribution was configured to reduce ice forming at the shed. Experimental results showed that the icicles on the coated porcelain insulators were notably shortened compared with those of uncoated...
In the last decade, industries have refined motor insulation systems to be more suitable for low voltage (LV) adjustable speed drive (ASD) applications. Furthermore, recent advances in power electronics and control systems have significantly increased the use of medium voltage (MV) ASD on motors. However, the challenge for reliability and service life has become more critical since many MV ASD fed...
A thermoplastic elastomer vulcanizate (TPV), was blended with emulsion prepared polyaniline-doped with dodecylbenzenesulfonic acid (Pani.DBSA). Pani.DBSA was characterized by ultraviolet (UV)–visible (vis), wide-angle X-ray scattering (WAXS) and superficial electrical resistivity techniques. The semi-conductive thermoplastic elastomer vulcanizate (SCTPV) was submitted to mechanical and electrical...
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