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SF6 gas vacuum evacuation removes air and moisture from high-voltage switchgear to ensure insulation integrity, typically requiring a vacuum level of <1 mbar. Specialized mobile units with vacuum pumps (e.g., 17–300 m³/h capacity) are used to prevent moisture freezing and gas contamination, often achieving vacuums under 1 torr, or even 0.8 Pa, for optimal performance.
Key Procedures for SF6 Evacuation
- Initial Evacuation: Connect a vacuum pump to the equipment compartment and evacuate until pressure is below 1 millibar to remove moisture and air.
- Moisture Control: Avoid pulling the vacuum too quickly to prevent internal water from freezing, which inhibits removal.
- Vacuum Maintenance: Maintain the low-pressure state for a sufficient duration (e.g., one hour) to ensure all water vapor is extracted.
- Equipment Used: Dedicated SF6 servicing units (like Enervac ERFU-2 or DILO) are typically used, featuring self-closing couplings to prevent emission,, integrated gauges, and moisture removal filters.
- Safety & Compliance: Use vacuum pumps designed for SF6, which often feature, , solenoid valves for automatic closure, ensuring no air enters if the system fails.
Equipment Features for Efficient Evacuation
- Pump Capacity: Mobile units are available in various speeds (17–300 m³/h) to suit different equipment sizes.
- Automatic Systems: Advanced units use solenoid valves instead of manual ball valves to prevent operator error and ensure the system seals automatically.
- Monitoring: Digital vacuum indicators (mbar/pa) and weighing scales for accurate monitoring of gas handling.
These processes ensure that the SF6 gas remains pure and that the insulating properties are maintained within the switchgear and circuit breakers.
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SF6 Gas Evacuation & Refill Unit (ERFU-2)
Enervac
https://www.enervac.com › sf6-gas-evacuation-refill-un...
Enervac
https://www.enervac.com › sf6-gas-evacuation-refill-un...
A lightweight, yet rugged, portable unit for the evacuation of gas switchgear, or breaker compartments; and regulated filling using standard SF6 gas cylinders.Read more
Evacuating and Refilling Device
DILO Company, Inc.
https://dilo.com › ... › Refilling and Evacuating Devices
DILO Company, Inc.
https://dilo.com › ... › Refilling and Evacuating Devices
Mobile evacuating and refilling cylinder cart with weight scale option for convenient, emission free SF6 gas handling.
How to Recover, Evacuate, and Fill an SF6 Gas Circuit ...
GasQuip
https://gasquip.com › how-to-recover-vacuum-and-fill-...
GasQuip
https://gasquip.com › how-to-recover-vacuum-and-fill-...
Jun 19, 2023 — Evacuate the Gas: Start the recovery unit's compressor and/or vacuum pump and initiate the gas recovery process. The compressor and vacuum pump ...Read more
Mobile SF6 Vacuum Pump Unit for evacuating air or nitrogen
SF6 Relations
https://www.sf6relations.com › mobile-sf6-vacuum-pu...
SF6 Relations
https://www.sf6relations.com › mobile-sf6-vacuum-pu...
The SF6 vacuum pump can evacuate any air or moisture from the gas compartment, ensuring the SF6 gas remains pure and free from contaminants.Read more
SF6 Gas refilling and evacuating device with digital weighing ...
DILO Armaturen und Anlagen GmbH
https://app.dilo.eu › article
DILO Armaturen und Anlagen GmbH
https://app.dilo.eu › article
This device covers two important functions: The integrated vacuum pump allows the evacuation of air down to < 1 mbar so that no air/gas mixture is produced ...Read more
How to Remove Moisture From an SF6 Breaker
YouTube · GasQuip
960+ views · 5 years ago
YouTube · GasQuip
960+ views · 5 years ago
When trying to remove water from an SF6 breaker, the most effective and safe way is to preform a vacuum dry out. The water actually boils ...
SF6 Gas Evacuating & Filling Device Manufacturer
Acore Filtration Co. Ltd.
https://www.acoreoilpurifier.com › sf6-gas-evacuating-f...
Acore Filtration Co. Ltd.
https://www.acoreoilpurifier.com › sf6-gas-evacuating-f...
GER Series SF6 Gas Filling Device is specially designed for vacuum evacuating and gas filling or refilling of SF6 electric equipments.Read more
Handling and Use of Sulfur Hexafluoride Gas
U.S. Environmental Protection Agency (.gov)
https://19january2017snapshot.epa.gov › documents
U.S. Environmental Protection Agency (.gov)
https://19january2017snapshot.epa.gov › documents
PDF
by III POLICY — Draw a vacuum on the gas compartment to complete the SF6 gas removal process. 7. Break vacuum with nitrogen or dry air as applicable. 8. SF6 Gas that is to be ...Read more
8 pages
HGC SF6 Gas Evacuation & Refill Unit
HENTION
https://www.hention.com › Portfolio
HENTION
https://www.hention.com › Portfolio
The HGC system can be used to vacuum, fill SF6 gas into new electrical equipment, and recover insulating gas from the SF6 apparatus in service.Read more
SF 6 gas refilling- and evacuating device
DILO Asia
https://app.dilo.asia › en-sg › article › sf6-gas-refilling-e...
DILO Asia
https://app.dilo.asia › en-sg › article › sf6-gas-refilling-e...
This device covers two important functions: The integrated vacuum pump allows the evacuation of air down to < 1 mbar so that no air/gas mixture is produced.Read more