SF6, critical temp
SF6, critical temp
(OP)
What happens to SF6 above 45.6 deg.C, since this is stated as a critical temp for use in a SF6 CB?
Audun
Audun
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RE: SF6, critical temp
RE: SF6, critical temp
The SF6 critical parameters are as follow:
The operational pressure on a typical SF6 dead-tank circuit breaker vessel is as follow:
CASE I: Breaker without operation at ambient temperature.
At rated filled pressure equivalent to 95 psig at 45.5oC there will not be any condensation since this is produced at critical pressure of 544.3 psig.
CASE II: Circuit breaker interruption operation at rated SC.
Temperature above 5000K converts the gas in stage of conductive plasma. After rapid cooling to 1500K, the material starts recovering the gas estate.
CASE III: During freezing condition.
For temperatures bellow –25C there is risk of condensation. Thermal insulated blanket with heater and mix with other dielectric gases could be used for critical cases with temperatures down to –50C.
RE: SF6, critical temp
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