Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1978-10-04
1980-10-21
Truhe, J. V.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200148A, H01H 3300
Patent
active
042296277
ABSTRACT:
The invention provides for a gas puffer type current interrupter having a pair of separable contacts, one of which is surrounded by a nozzle formed of electrically insulating material. Upon separation, an arc is drawn between the contacts through the throat of the nozzle. The method of the invention includes permitting the arc to fill and clog the nozzle throat thereby restricting the escape of dielectric gas which is being forced into the nozzle. The clogging of the nozzle by the arc is permitted to an extent sufficient to raise the temperature within the nozzle such that significant ablation of the nozzle material occurs interior of the nozzle. The ablation or evaporation of the nozzle material produces a significant increase in pressure within the nozzle which serves to rapidly extinguish the arc. The interrupter includes a nozzle having a throat size selected so that the cross sectional area of the arc substantially fills the throat. The nozzle will be clogged a sufficient portion of the time between contact separation and arc extinction to produce the desired ablation of the nozzle material.
REFERENCES:
Murano et al., "Heavy Current Clogging Phenomena in SF.sub.6 Gas Arc", IEEE Power Engineering Society Conference Paper, C74 185-5, presented at the IEEE Power Engineering Society Winter Meeting, Jan. 27-Feb. 1, 1974.
Noeske, "Investigation of Dynamic Nozzle Parameters for Various Nozzle Geometries and Test Conditions of an Experimental Half-Size SF.sub.6 Puffer Breaker", IEEE Transactions, vol. 96, No. 3, May-Jun. 1977, pp. 896-906.
Tominaga et al, "Estimation and Performance Investigation on SLF Interrupting Ability of Puffer-Type Gas Circuit Breaker", IEEE Power Engineering Society Conference Paper, presented at the IEEE Power Engineering Society Winter Meeting, Jan. 1978.
Yoshioka et al., "A Method and Applications of a Theoretical Calculation for On-Load Pressure Rises in Puffer Type Gas Circuit Breakers ", IEEE Power Engineering Society Conference Paper, F78 682-7, presented at the IEEE Power Engineering Society Summer Meeting, Jul. 16-21, 1978.
Electric Power Research Institute Inc.
Ginsburg Morris
Truhe J. V.
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