| 摘要 |
938,165. Fluid-blast switches. WESTINGHOUSE ELECTRIC CORPORATION. March 15, 1962 [March 24, 1961], No. 9929/62. Class 38 (5). A fluid-blast switch having a closed fluid system is provided with means which, when the contacts are closed, can drive the fluid past the contacts and along the walls of the switch so as to transfer heat to the surrounding air. In Fig. 1 an arrangement similar to that of Specification 843,031 has movable contact cylinders 14 slidable on fixed pistons 22 and co-operating with nozzle fixed contacts 38 secured or perforated plates 37 in terminal end caps 35. One of the current transformers 13 on the condenser bushing 12 energizes a motor 34 to drive a fan 33 in an aperture 32 in an insulating wall 31 so that the fluid, preferably sulphur hexafluoride, circulates as shown by arrows. Valves 28 will close during an opening operation. In Fig. 4 an arrangement similar to that of Specification 885,932 is provided with funnels 83 arranged to collect gas which rises by connection from the closed contacts. This gas passes through hollow conductors 84 to terminal caps 85 and into insulators 87 from which it is extracted by fans 33 before passing through filters 95 and back into the tank 67. The motors 34 may be energized from a battery in series with relay contacts or the relay may be energized from the current transformer or from the battery through contacts controlled by a bimetal strip attached to casing 4b or 91.
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