Author :
Belmadani, B. ; Casanovas, J. ; Casanovas, A.M.
Abstract :
For pt.I see ibid., vol.26, no.6, p.1163-76, Dec. 1991. In order to define the origin and the production rate of the CF4 formed under the effect of arcing in circuit breakers containing SF6 as a gaseous insulator, a series of measurements was taken in two Alsthom circuit breakers in which the gaseous insulator (SF 6, N2), the material from which the nozzle is made (PTFE+CaF2, pure PTFE, RPS Ryton R4) and the electrode metal (Cu/W alloy, copper) were changed. Moreover, with the aim of refining the results concerning the influence of the chemical composition of the insulator used to make the nozzle, several insulators (Megelite, PPS Ryton R4, Kel´F, Teflon, polypropylene and nylon) were exposed to sparking in an SF6 atmosphere
Keywords :
arcs (electric); gas blast circuit breakers; gaseous insulation; sulphur compounds; Alsthom circuit breakers; Chemical aspects; arcing; chemical composition; circuit breakers; decomposition; electrode metal; gaseous insulator; insulators; nozzle; power arcs; production rate; sparking; tetrafluoromethane; Atomic measurements; Chemical products; Circuit breakers; Circuit testing; Copper; Gas insulation; Inorganic materials; Metal-insulator structures; Production; Sulfur hexafluoride;
