First off, sf6 stands for sodium hexafloride gas which is inert, Siemens did some stuff in a 500kv switchyard I worked in and with a SF6 breaker the air gap is about 6 inches and the switch size is measured in inches, compared to the "old" air breakers that are huge (larger than your garage) and sounded like a cannon going off when they opened. With SF6 your switchyards and main disconnects can be very unobtrusive at a time when substations are NIMBY. My experience with them was fine although much closer tolerances are required(mm not inches)
Sulphur hexafluoride (SF6) is an inert, heavy gas having good dielectric and arc extinguishing properties. The dielectric strength of the gas increases with pressure and is more than of dielectric strength of oil at 3 kg/cm2. SF6 is now being widely used in electrical equipment like high voltage metal enclosed cables; high voltage metal clad switchgear, capacitors, circuit breakers, current transformers, bushings, etc. The gas is liquefied at certain low temperature, liquefaction temperature increases with pressure.
Sulphur hexafluoride gas is prepared by burning coarsely crushed roll sulphur in the fluorine gas, in a steel box, provided with staggered horizontal shelves, each bearing about 4 kg of sulphur. The steel box is made gas tight. The gas thus obtained contains other fluorides such as S2F10, SF4 and must be purified further SF6 gas generally supplier by chemical firms. The cost of gas is low if manufactured in large scale.
The previous answer was inept.
Medium-voltage circuit breakers rated between 1 and 72 kV may be assembled into metal-enclosed switchgear line ups for indoor use, or may be individual components installed outdoors in a substation. Air-break circuit breakers replaced oil-filled units for indoor applications, but are now themselves being replaced by vacuum circuit breakers (up to about 35 kV). Like the high voltage circuit breakers described below, these are also operated by current sensing protective relays operated through current transformers. The characteristics of MV breakers are given by international standards such as IEC 62271. Medium-voltage circuit breakers nearly always use separate current sensors and protection relays, instead of relying on built-in thermal or magnetic overcurrent sensors.
Medium-voltage circuit breakers can be classified by the medium used to extinguish the arc:
first off, sf6 stands for sodium hexafloride gas which is inert, Siemens did some stuff in a 500kv switchyard I worked in and with a SF6 breaker the air gap is about 6 inches and the switch size is measured in inches, compared to the "old" air breakers that are huge (larger than your garage) and sounded like a cannon going off when they opened. With SF6 your switchyards and main disconnects can be very unobtrusive at a time when substations are NIMBY. My experience with them was fine although much closer tolerances are required(mm not inches)
What is really SF6 stands for?it is sodium hexaflouride or sulfur hexaflouride?
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