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SF₆–gas

Heavy gas sulfur hexafluoride (SF₆) was originally discovered in the 1930s. Despite its outstanding qualities as an gaseous electrical insulator, it had initially no practical use in engineering.

It was only by the end of the 1950s, first in the USA and soon afterwards in Europe that this particular gas was more extensively explored, leading to its principle application as an extinguishing and electrical insulating medium.

Commonly used in power applications, SF₆ is used in high-voltage circuit breakers, metal-enclosed switchgear, linear accelerators, high-voltage transformers, capacitors and gas insulated lines worldwide.

 

SF₆–gas properties

Normative references

IEC 60 480	(re-use)
IEC 62271-4	(recovery)
(EC) 842/2006 F	(gas regulation)
(EC) 305/2008	(certification)
(EC) 1493/2007	(reporting)
ASTM D2472-00	(standard specification)
CAS Registry Number:	2551-62-4
UN Number/IATA No.:	1080
Kyoto-Protokoll, Rio de Janeiro:	1992

Sulfur Hexafluoride is a colorless and odorless gas. SF₆–gas is a non-toxic, non-flammable, stable compound. Its breakdown voltage is approximately 2.5 times higher than normal air, as the electro-negative SF₆–molecule has a strong affinity to free electrons. It has over 100 times better arc quenching capability and significant better heat dissipation than air (N₂).

An increase in pressure allows the dielectric strength of SF₆ to be adjusted to individually designed requirements.

The rapid arc extinction in the SF₆-gas is particularly encouraged by the favorable distribution of electrical conductivity and thermal conductivity in its critical temperature range. Electrical arcing fission products recombine almost completely. The remaining amount of gaseous sulfur fluorides and solid metal fluorides will be trapped in filters.

 

SF₆–gas Properties

 

SF₆-gas recovery & servicing equipment

Making use of its longstanding expertise of 40 years in gas handling and 100 years in vacuum processing technology, Gasbanor (Switzerland) GmbH, Micafluid offers compact units with all required features for a safe, dependable and environmentally friendly treatment of SF₆–gas.

Using entirely dry– running compressors and vacuum pumps, our gas treatment & recovery units are built at our manufacturing site in Switzerland using state of the art, heavy-duty Swiss and European components.

Gas treatment & recovery units of type GTRU, recover, purify and refill the SF₆–gaswith a high degree of safety and reliability during its process, offering versatility through an automated drive and control technology.

Through a high performance and efficient process our GTRU - type units dry, filter, liquefy SF6-gas to refill the internal tanks and external SF₆ - cylinders. As an additional feature we offer the ability to recover and refill one gas compartment while evacuating another simultaneously.

Gasbanor (Switzerland) GmbH, Micafluid offers a choice of standard models, any of which can be customized to individual customer specifications. Within our standard range, mobile GTRU units are available with internal tank sizes of 30 L, 330 L and 630 L.

　

SF₆–gas treatment and recovery unit - GTRU – 020 (MINI)

 

• Fully automatic or manually operated compact units
• Suited for servicing small amount of SF₆–gas
• Modestly-priced and compact unit
• Dry- running compressor (final pressure 50 bar)
• Suction pump, final vacuum < 5 mbar
• Vacuum pump for air, final vacuum < 1 mbar
• Purification: ≤ 1 micron, (H2O) ≤ 10 ppm
• No unnecessary evacuation of hoses
• Recovering of SF₆–gasinto separate gas cylinders
• Refilling from separate gas cylinders
• Transfer of SF₆–gasfrom separate cylinders to separate cylinders

contact for further information

 

SF₆–gas treatment and recovery unit - GTRU – 040 (MIDI)

 

• Fully automatic or manually operated units
• Compact unit
• Suited for servicing medium volume SF₆–equipment
• Internal tank – capacity 25kg
• Dry- running compressor (final pressure 50 bar)
• Suction pump - final vacuum < 1 mbar
• Vacuum pump for air, final vacuum < 1 mbar
• Purification: ≤ 1 micron, (H2O) ≤ 10 ppm
• No unnecessary evacuation of hoses

Special feature: ability to recover and refill one gas compartment while evacuating another simultaneously.

contact for further information

 

SF₆–gas treatment and recovery units - GTRU – 060 (MAXI)

 

• Fully automatic or manually operated units
• Compact unit
• Suited for servicing large volume SF₆–equipment
• Internal tank – 330 kg or 630 kg
• Separate, mobile SF₆–gas storage tank available on request
• Dry- running compressor (final pressure 50 bar)
• Vacuum compressor, final vacuum < 1 mbar
• Vacuum pump for air, final vacuum < 1 mbar
• Purification: ≤ 1 micron, (H2O) ≤ 10 ppm
• No unnecessary evacuation of hoses

Special feature: ability to recover and refill one gas compartment while evacuating another simultaneously.

contact for further information

　

SF₆-gas refilling units GRC– 250– R01, R02, GRC– 400– R01, R02

 

• Refilling cart with variable wheel size, Ø 250 or 400 mm
• Connection for SF₆–cylinders
• Reducer for SF₆–gas
• Incl. pressure gauge and safety valve, metal clad or rubber hoses with ball valve
  and quick connections, weighing device with digital display, 0 – 150 kg and storage box for adapters

contact for further information

 

 

 

GRCVP– 250– R01, R02 / GRCVP– 400– R01, R02

 

• Evacuation & refilling cart with variable wheel size Ø 250 or 400 mm and vacuum pump
• Connection for SF₆–cylinders
• Reducer for SF₆-gas
• Incl. pressure gauge and safety valve, metal clad hoses with ball valve
  and quick connections, weighing device with digital display, 0 – 150 kg and storage box for adapters

  contact for further information

 

 

 

 

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