SF6 Switchgear by Hugh M. Ryan, Gordon R. Jones

By Hugh M. Ryan, Gordon R. Jones

An in depth evaluation of advancements in SF6 switchgear overlaying basic homes of SF6, interrupter forms, features and linked working mechanisms, arc modelling and computing device aided tools for interrupter layout and review.

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As a result the performance deterioration as peak current is increased is less pronounced than at constant B. , 1985).

Provided this condition is satisfied, mass flow rates from the arc chamber can be increased by an order of magnitude at low currents (~ 100 A RMS) without prejudice to the mass flow rate at higher current levels (~40kA). The possible use of SF6-N2 mixtures in puffer interrupters requires an appreciation of how the compressive action of piston and arc may each be Characteristics of SF6 interrupters 29 10" Fig. 2 Arc-induced gas heating a Gas temperature at nozzle inlet for various diameters (Fig.

500" DIA Fig. 5 30 40 50 60 70 80 90 full size short line fault current ,kA r m s b Fig. 5 (continued) b Projected performance of duoflow nozzles (Fig. , 1983) factor', 2 ( 1 + a)/? (Noeske et ai, 1983). The parameter a is a measure of the performance improvement of a monoflow nozzle which could be achieved through the elimination of contact vapour. The parameter ft takes account of the different geometrical parameters of the mono- and duoflow nozzles, which are inevitable upstream and which may affect not only the local contribution to interruption, but also the flow, and hence influence upon interruption of the downstream-nozzle section.

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