Thursday, May 12, 2016

Rupture Disc Relieves Unsafe Internal SF6 Pressure on Electrical Switchgear

Electric switchgear
Electric switchgear use rupture discs
In an electric power system, the equipment used for switching, controlling and protecting the electrical circuits and equipment is known as switchgear.  In general it's the combination of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment. Switchgear controls the switching on or off generators, transmission lines, distribution components, and other electrical equipment.

Gas-insulated high-voltage switchgear, using SF6 (Sulphur hexafluoride), is metal enclosed switchgear consisting of high-voltage components such as circuit-breakers and disconnectors. SF6 is used because of its outstanding electrical, physical and chemical properties. Typical places where this switchgear is used are buildings, on offshore platforms, industrial plants and power plants.

Manufacturers of electrical switchgear use rupture discs on cabinets where conductors and contacts
Rupture discs
Rupture disc used on SF6 overpressure protection.
are insulated by pressurized SF6 gas.

Within switchgear housings, very large amounts of energy are released in the form of heat and even radiation. This energy may give rise to pressure increases which may burst the enclosure unless the heated gases are given the possibility to ow out through relief openings. In the event of an internal fault, a pressure relief device would operate before internal pressure exceeds the design limit of the compartment. The pressure relief device should be designed so that discharges resulting from internal faults are directed away from locations where personnel may be present.

For more information regarding any rupture disc application, contact:
BCE (Belilove Company-Engineers)
21060 Corsair Blvd
Hayward, CA 94545
Phone: (510) 274-1990
Fax: (510) 274-1999