Professional SF6 gas handling
SF6 recovery "state-of-the-art"
Professional gas handling and SF6 recovery equally combines environmental protection and economic efficiency. DILO maintenance devices make the SF6 gas handling simple and efficient encompassing the following functions:
- SF6 recovery
The gas is recovered from the gas compartment of the switchgear down to the desired final vacuum (mostly 1 mbar).
- SF6 purification and drying
When recovering and filling gas compartments the gas is automatically led in the service cart through dry and particles filters which retain decomposition products, moisture and solid particles effectively. For the reuse of SF6 gas the limit values in accordance with IEC 60480 are to be observed.
- Storage of SF6
When recovering SF6 from the circuit breaker the gas is stored in gaseous or liquid form by means of a compressor which compresses the gas.
- Evacuation of air or nitrogen
Before filling with SF6 gas the gas compartments must be evacuated in order to avoid mixing with air. Therefore it is evacuated to < 1 mbar with an integrated vacuum pump.
- Filling the gas compartments with SF6
The purified gas is returned into the gas compartment with overpressure or by means of a compressor to the desired operating pressure. The SF6 stored in liquid form is converted into gaseous form via the evaporator installed in the maintenance device.