Highly stable ZnO varistor ceramics with steadily decreasing power loss have been put into applications in electrical and electronic systems for overvoltage protections, even the absence of general understandings on their aging behaviors. In this paper, we investigated nature via conducting comparative dc experiments both air nitrogen, during which variations properties interface were measured ...

J.Monisha , S.Natarajan 2 SEEE , SASTRA UNIVERSITY,Thanjavur,Tamilnadu-613 401 SEEE , SASTRA UNIVERSITY,Thanjavur,Tamilnadu-613 401 1 [email protected] [email protected] Abstract— Conventional non-pilot distance relaying schemes having the facility of series compensated transmission line were found to fail in providing requisite protection to the transmission line during phase faults...

A second addition of lmol% of CoO to a pre calcined SnO2-based ceramic doped with 1.0mol% of CoO, 0.05mol% of Nb2O5 and 0.05mol% of Cr2O3 promotes the appearance of a secondary phase, Co2SnO4, besides the SnO2 cassiterite phase, when the ceramic was sintered at 1350°C/2h. This was observed using X-ray powder diffraction, scanning electron microscopy and energy dispersive X-ray techniques. Rietv...