Transformer substation

The level of humidity in SF6-insulated switchgear must be kept below its water saturation point. If the gas is too humid, it loses some of its insulating properties; corrosion and dangerous leaks can also occur. A complete SFhandling instrument monitors the quality of the gas, dries it out when wet, and replaces it safely when necessary, thanks to a sulfur hexafluoride tank.

Sulfur hexafluoride (SF6) has excellent dielectric and heat transfer capabilities. That’s why it is the preferred insulator for power transmission and distribution (T&D) switchgear. However, humidity in the gas can decrease its insulation strength and promote corrosion in the equipment, leading to serious health and environmental problems related to leaks. Therefore, one of the top priorities for T&D engineers is to monitor the humidity level of gas-insulated switchgear (GIS). SF6 handling is crucial. As the humidity in SF6 approaches the gas’s water saturation point, operators must make sure the wet gas is replaced with dry gas.

Replacing Sulfur Hexafluoride

SF6 handling can be tricky. The gas is nontoxic, but it easily displaces oxygen in enclosed areas, which can asphyxiate nearby personnel. What’s more, SF6 is a very powerful greenhouse gas – 23,900 times more effective than CO2 in trapping heat. To ensure that no leaks occur, the T&D industry relies on SF6-handling instruments that 1) are designed to address safety issues and 2) comply with strict emissions regulations.

For decades, WIKA’s experts have put their experience to work in developing better products that address market demands. Our latest SF6 products – pumps, compressors, filters, humidity and gas condition measuring systems, sulfur hexafluoride tank – use advanced technology to safely handle the gas.

WIKA’s All-in-One Solution for SF6 Handling

GPU-2000 SF6 gas handler

GPU-2000 gas handling unit with sulfur hexafluoride tank

To simplify operations, WIKA has combined gas handling – filling, evacuating, cleaning, and venting – in one instrument for GIS and linear accelerators. The cost-effective GPU-2000comes equipped with a humidity filter, particle filter, vacuum pump for air, oil-free vacuum compressor for SF6, and gas humidity measuring system. The standard model has a 300-liter sulfur hexafluoride tank; there is also the option for a 600-liter tank or no tank at all.

The system sends an alert when the GDHT-20, a humidity monitor and transmitter, registers a value close to the maximum level allowed for the gas. Operators then have the option to either remove the wet gas and replace it with new SF6, or circulate the wet gas through filters to dry it out.

The GPU-2000 is fast, efficient, low-maintenance, and intuitive. User-friendly features include a 10-inch IntelliTouch touchscreen and all components mounted on a compact cart with solid-rubber tires. A SIL (Safety Integrity Level) 2 design means operators can virtually rule out user errors, gas escapes, and overfilling the SF6 tank. With a USB port and WiFi readiness, this gas-handling unit is easily integrated into existing systems.

Click here to download the white paper GPU-2000: WIKA’s Optimal Solution for Comprehensive SF6 Gas HandlingFor more information about the GPU-2000, sulfur hexafluoride tanks, and other innovative gas-handling equipment, contact our experts today.

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