QTHS-3-500
500m³h SF6 Evacuation Unit
The SF6 Gas Vacuum Pumping Unit is designed for vacuum pumping of GIS (Gas Insulated Switchgear), GIL pipelines, and SF6 gas insulated electrical equipment during installation, maintenance, and commissioning.
The unit is capable of creating a high vacuum condition inside the equipment before SF6 gas filling, effectively removing moisture, air, and non-condensable gases from the system. This process ensures the insulation performance and operational reliability of high-voltage equipment.
The system typically consists of a high-efficiency vacuum pump, vacuum measurement system, control panel, pipelines, and protective devices, forming a compact and reliable vacuum pumping solution for substations and power plants.
With robust construction and stable performance, the unit is suitable for onsite field service as well as workshop applications in the power transmission and distribution industry.
The SF6 Gas Vacuum Pumping Unit (500 m³/h) is specifically designed for vacuum pumping applications in medium and large-sized GIS equipment.
The unit provides stable vacuum performance and reliable operation, meeting the vacuum requirements prior to SF6 gas filling during equipment installation and maintenance processes.
The main technical parameters of the standard model are listed below.
In addition to the 500 m³/h model, YUNENG also offers units with other pumping capacities, such as 250 m³/h and 1000 m³/h, as well as larger or smaller configurations, which can be customized according to specific project requirements.
| Item | Name of Parameter | Unit | QTHS-3-500 |
| Technical parameters | Type | / | Mobile |
| Working temperature | ℃ | -10℃～50℃ | |
| Ultimate vacuum of vacuum pump unit | Pa | ≤1 | |
| Pumping rate | M3/H | ≥500 | |
| Measuring range of vacuum gauge | Pa | 0-100000 (Absolute pressure) | |
| The vacuuming time to 0.2mbar for a container with a volume of 1m³ and an initial pressure of 1bar | mins | ≤14 | |
| The vacuuming time to 1mbar for a container with a volume of 1m³ and an initial pressure of 1bar | mins | ≤38 | |
| Number of evacuation interface groups | / | 3 | |
| Size of evacuation interface | DN | 20 | |
| Working power | / | As per buyer’s option | |
| Dimension for reference | mm | 1300*850*1350 | |
| Total power | kW | ≤6 | |
| Weight for reference | Kgs | 380 | |
| *Due to different equipment configurations, its dimensions, weight and gas treatment indexes will vary slightly. | |||
1. Advanced Design and Easy Operation
The unit features an advanced design with a compact and reasonable structure. All components are arranged for convenient operation and easy maintenance, ensuring simple and clear operation for field engineers.
2. Reliable Vacuum System with Leybold Pump
The vacuum system is equipped with a Leybold vacuum pump, providing stable vacuum performance and reliable operation. The pump is designed with an automatic oil backflow prevention device to avoid oil contamination during shutdown.
3. Multi-Unit Vacuum Measurement
The vacuum measurement system supports multiple pressure units, including bar, Pa, psi, kPa, and MPa, allowing flexible use according to different engineering standards and user preferences.
4. Automatic Three-Phase Power Detection
The electrical system automatically confirms the three-phase power supply and provides automatic protection against phase failure, ensuring safe operation and protecting the vacuum pump motor.
5. Automatic Pipeline Evacuation
The system can automatically evacuate the internal pipelines before operation, helping maintain cleanliness and preventing contamination during vacuum pumping of SF6 insulated equipment.
6. Overpressure Protection Function
The unit is equipped with an overpressure protection function. If the initial pressure exceeds 0.1 MPa, the system will automatically stop or prevent startup to protect the equipment and ensure safe operation.
7. Oil Backflow Prevention Design
The vacuum pump is equipped with a check valve to effectively prevent oil backflow, ensuring safe operation of the vacuum system and protecting connected equipment.
The SF6 Gas Evacuation Unit is widely used in the power transmission and distribution industry, including:
- Vacuum pumping for GIS (Gas Insulated Switchgear)
- Vacuum pumping for GIL (Gas Insulated Transmission Line)
- Pre-vacuum treatment before SF6 gas filling
- Maintenance and overhaul of SF6 insulated electrical equipment
- Vacuum processing of high-voltage circuit breakers
- Installation and commissioning of substation equipment
It is an essential auxiliary device for SF6 gas handling and insulation system preparation in modern high-voltage substations.
