Sulfur hexafluoride circuit breaker | Wikipedia audio article
This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Sulfur_...
00:00:54 1 Operating principle
00:02:25 2 Brief history
00:06:07 3 Design features
00:06:16 3.1 Thermal blast chambers
00:07:37 3.2 Self-blast chambers
00:09:08 3.3 Double motion of contacts
00:09:53 3.4 Comparison of single motion and double motion techniques
00:10:47 3.5 Thermal blast chamber with arc-assisted opening
00:11:41 4 Generator circuit breakers
00:12:58 5 High-power testing
00:13:36 6 Issues related to SFsub6/sub circuit breakers
00:14:38 7 Comparison with other types
00:16:27 8 See also
00:16:37 9 Notes
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SUMMARY
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Sulfur hexafluoride circuit breakers protect electrical power stations and distribution systems by interrupting electric currents, when tripped by a protective relay. Instead of oil, air, or a vacuum, a sulfur hexafluoride circuit breaker uses sulfur hexafluoride (SF6) gas to cool and quench the arc on opening a circuit. Advantages over other media include lower operating noise and no emission of hot gases, and relatively low maintenance. Developed in the 1950s and onward, SF6 circuit breakers are widely used in electrical grids at transmission voltages up to 800 kV, as generator circuit breakers, and in distribution systems at voltages up to 35 kV.
Sulfur hexafluoride circuit breakers may be used as self-contained apparatus in outdoor air-insulated substations or may be incorporated into gas-insulated switchgear which allows compact installations at high voltages.
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