GSH-NNA-30/250-400 Mobile Heavy-Duty SF₆ Gas Recovery Unit
GSH-NNA-30/250-400 is a heavy-duty industrial-grade SF₆ gas handling system designed for large-scale power utilities, switchgear manufacturing plants, EPC contractors and third-party testing institutions. It is dedicated to high-efficiency SF₆ gas recovery, deep vacuumizing, multi-stage purification, compression liquefaction, large-capacity storage and pressure-regulated refilling during installation, major maintenance and decommissioning of 110kV ~ 500kV large-capacity GIS, EHV SF₆ circuit breakers, instrument transformers and gas-insulated busbars.
It adopts a two-stage oil-free SF₆ dedicated compressor with positive & negative pressure recovery mode, achieving a recovery rate of 30m³/h and final recovery pressure as low as ≤10kPa, minimizing residual gas emission. The 250m³/h high-capacity dual-stage rotary vane vacuum pump ensures deep vacuum degree ≤5Pa, fully meeting the strict vacuum requirements of high-voltage gas-insulated equipment. The multi-stage deep purification system includes high-efficiency particle filters, molecular sieve dryers and coalescing oil-mist separators, effectively removing moisture, decomposition products, oil residues and dust particles. Recovered gas meets IEC 60480 reuse standards and can be directly refilled into equipment.
Equipped with a 7-inch PLC touch screen, the unit supports one-key fully automatic operation and manual step-by-step control. It has built-in comprehensive safety protection mechanisms including over-pressure, over-current, over-temperature and low oil level alarms. The heavy-duty mobile cabinet structure with reinforced casters and traction handle is suitable for both on-site substation operation and fixed workshop use. It realizes closed-loop large-volume SF₆ gas management, reduces gas emission, lowers operation costs and meets environmental protection and production efficiency requirements.
| Parameter | Specification |
|---|---|
| System Functions | SF₆ recovery, deep vacuumizing, purification drying, liquefied storage, pressure-regulated refilling |
| Recovery Performance | |
| Recovery Rate | 30 m³/h (at initial pressure 0.8MPa) |
| Final Recovery Pressure | ≤ 10 kPa (absolute, negative pressure deep recovery) |
| Compressor Type | Two-stage oil-free SF₆ special compressor |
| Vacuum Performance | |
| Vacuum Pumping Speed | 250 m³/h |
| Ultimate Vacuum | ≤ 5 Pa |
| Vacuum Rise Rate | ≤ 400 Pa / 24h |
| Vacuum Pump Type | Dual-stage rotary vane vacuum pump |
| Purification Performance | |
| Particulate Filtration | ≤ 0.1μm, 99.99% efficiency |
| Moisture Content After Purification | ≤ 40 ppmV |
| Oil Content After Purification | ≤ 10 ppmW |
| SF₆ Purity After Recovery | ≥ 98% by volume |
| Dryer Regeneration | Vacuum heating activation regeneration supported |
| Storage Tank | 400kg nominal liquefied storage capacity, pressure vessel certified |
| Design Pressure of Tank | 5.0 MPa |
| Control Mode | PLC + 7" touch screen, fully automatic / manual dual mode |
| Safety Protection | Over-pressure, over-current, over-temperature, low oil level alarm, emergency stop, safety valve |
| System Leakage Rate | ≤ 0.5% per year |
| Cooling Mode | Air-cooled, no external water source required |
| Input Power Supply | AC 380V ± 10%, 50Hz, three-phase |
| Operating Temperature | -10℃ ~ +50℃ |
| Ambient Humidity | ≤ 85% RH (non-condensing) |
| Structure Form | Heavy-duty mobile cabinet type with brake casters and traction handle |
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