SF Cylinder Heater
The SF Cylinder Heater provides a clean, simple and quick
method for applying heat to cylinders containing SF6. A
130°F (54°C) cut-out thermostat is designed into each
heater to prevent overheating. Heater efficiency is improved
through the use of a custom designed cylinder blanket.
SF6 is stored in 9.25" diameter cylinders in liquid form
under pressure. Utilities (Transmission and Distribution
Divisions) use SF6 circuit breakers for their high voltage
(69,000-400,000 volts) transmission lines. The SF6 provides
an inert blanketing media that prevents arcing when
the breakers open and close. Periodically, maintenance
crews need to hook up the storage cylinders to the circuit
breakers to add SF6 to the breaker and increase the
system’s operating pressure. When the valve is opened and
gas flow begins, the cylinder temperature drops rapidly and
slows down the flow of SF6 into the circuit breaker. Heat
must be added to the cylinder to make up the heat losses
caused by vaporizing from a liquid to a gas.
Applying heat safely not only converts this time-consuming
activity into an efficient and convenient operation but, also
ensures maximum removal of SF6 from the cylinder and
eliminates the return of partially filled cylinders.
Operating Voltage: 120 VAC