SF6 Gas Vacuum Pumping Device Three-Level Inst
allationStructural Features:
It has comprehensive functions such as recovery, charging and discharging, purification, vacuum pumping, storage, and cylinder filling. The system is relatively complete; refer to Appendix I for the system diagram. The series connection or switching of each function is mainly achieved through the electric control box and ball valves concentrated on one side of the panel.
The basic working principle of the recovery device is the cryogenic liquefaction method. During recovery, the suction and compression properties of the compressor are used to draw SF6 gas at a certain pressure from SF6 electrical equipment into the compressor and compress it to a higher pressure. At the same time, utilizing the low evaporation temperature characteristics of R22 refrigerant, the higher-temperature SF6 gas is cooled to the condensation temperature for liquefaction and storage. This continuous suction continues until the SF6 compressor operates in series until the final recovery pressure is reached.
During charging and discharging, first use the vacuum pump of this device to evacuate the SF6 electrical equipment (or cylinders) and connecting pipelines, then directly use the pressure difference or the suction of the compressor to create a certain pressure difference to fill the SF6 from the storage container of the device into the SF6 electrical equipment until the required working pressure is reached. When cylinder filling is needed, the characteristics of the R22 refrigerant as mentioned above are simultaneously utilized to directly fill the liquefied SF6 into the cylinders.
SF6 Gas Vacuum Pumping Device Three-Level Installation Technical Parameters:
1. Recovery
Initial recovery pressure ≤0.8MPa
Final recovery pressure ≤50KPa
Recovery time: For a 1 m3 SF6 gas volume at an initial pressure of 0.8MPa, recovery to a final pressure of 50KPa takes less than 2.5 hours.
2. Charging
For a 1 m3 SF6 gas volume at an initial pressure of 133Pa, charging to 0.8MPa takes less than 0.8 hours.
3. Vacuum Pumping
Ultimate vacuum of the device is less than or equal to 10 Pa
For a 1 m3 SF6 gas volume at an initial pressure of 0.1MPa, the time required to evacuate to 133Pa is less than 1.0 hour.
4. Storage
Storage container volume: 0.015m3
Nominal liquid storage capacity: 50kg
Maximum storage pressure: 3.8 MPa
5. Purification
For SF6 gas with a water content below 1000PPM (by volume), after one recovery and purification cycle with this device, the moisture content is less than 60PPM (by weight), and the oil content is less than 10PPM (by weight).
6. Annual leakage rate ≤1% of nominal storage capacity
7. Noise ≤75dB(A) sound pressure level
8. Working environment temperature: -10°—40℃
9. Power ≤5KW
10. Power supply: AC three-phase five-wire system, 50HZ, 380V±10%
11. Weight approximately 400 kg
12. Dimensions (length×width×height): 1360×800×1300
Functional Features
l High efficiency in vacuum pumping and charging, low energy consumption
l Power supply equipped with phase sequence automatic phase change system
l High-precision thermocouple vacuum gauge, simple and practical
l Advanced design, complete functions, reasonable structure, simple and clear operation
l The control system of the device adopts new technology SF6 special valves
l The equipment adopts a mobile structure, convenient for on-site use, easy to move, and does not damage the ground
l The whole machine is small in size, light in weight, and low in noise
Product Functions:
1. Vacuum pumping and vacuum measurement for the device itself, SF6 switches, and GIS
2. Vacuum pumping and vacuum measurement for liquefaction tanks
3. Vacuum pumping and vacuum measurement for the device itself
4. Charging SF6 switches
5. Recovery of SF6 gas from electrical equipment, including moisture treatment and oil treatment
6. Drying and purification of recovered and recharged SF6 gas
7. Recovery, liquefaction storage, and residual pressure measurement of SF6 gas in SF6 electrical equipment
8. Can accommodate an 80-liter liquid storage tank inside the device body.
9. Compressed liquid storage of SF6 gas.
10. The device is mobile.
