GAS-TYPE CIRCUIT-INTERRUPTERS HAVING ADMIXTURES OF HELIUM WITH SMALL CONCENTRATIONS OF SULFUR- HEXAFLUORIDE (SF.SUB.6) GAS

摘要

IMPROVED GAS-TYPE CIRCUIT-INTERRUPTERSHAVING ADMIXTURES OF HELIUM WITH SMALLCONCENTRATIONS OF SULFUR-HEXAFLUORIDE (SF6) GASABSTRACT OF THE DISCLOSUREAn improved gas-type circuit-interrupter is pro-vided utilizing a mixture of helium and sulfur-hexafluoride(SF6) gases, with the percentage concentration of sulfur-hexafluoride (SF6) gas being 10%, or less, by volume.The improved gas-type circuit-interrupter of thepresent invention may be utilized to advantage as a "puffer-type" circuit-interrupter, in which relative movement betweena piston and operating cylinder takes place for forcing thecompressed gas to flow through a suitably-located orifice,or nozzle member, and into intimate engagement with theestablished arc disposed therein to effect its extinction.Another form of the gas-type circuit-interrupterof the present invention may include a pressurized gas-reservoir chamber containing the aforesaid admixture of thehelium and sulfur-hexafluoride gases in the proper concentra-tion, that is 10%, or less, by volume, of sulfur-hexafluoride(SF6) gas with the remaining being made up substantiallyentirely of helium.