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Product Overview
Operating as a highly secure node in electrical grids, this gas insulated switchgear features a modular design that allows for flexible combination based on specific project requirements. All high-voltage live parts are completely enclosed within a robust stainless steel gas tank filled with SF6 gas, ensuring they are entirely unaffected by external environmental conditions. With an impressive IP67 protection grade for the gas compartment and IP4X for the outer enclosure, this sf6 gas insulated unit guarantees continuous, safe power distribution even in demanding installations subject to dirt, high humidity, or potential water immersion.
sf6 gas insulated switchgear Features & Benefits
- Complete Isolation & Safety: The primary high-voltage components are hermetically sealed inside a stainless steel tank, creating a truly sf6 gas switchgear environment that ensures maximum safety and zero exposure to external elements.
- Extreme Environmental Adaptability: The internal SF6 gas tank boasts an IP67 protection rating, providing outstanding resistance against severe conditions such as water immersion and corrosion.
- Modular & Flexible Design: The unit’s structural design allows various modules to be flexibly combined to perfectly match diverse ring network and terminal power supply configurations.
- Reliable Mechanical Interlocking: Equipped with a dependable interlocking mechanism that strictly prevents operator misoperation, safeguarding both personnel and equipment.
- High Withstand Capacity: Structurally engineered to safely endure internal arcing of 20kA/1s and a rated peak withstand current of up to 50kA.
- Long-lasting Durability: Built for rigorous daily use, the load switch offers a mechanical life of 10,000 operations, while the earthing switch supports up to 2,000 operations.
Technical Specifications for sf6 gas insulated switchgear
The precise electrical parameters and environmental operating conditions for the ZHM7-12 series, extracted directly from the manufacturer’s technical data, are detailed in the tables below.
Main Technical Parameters
| Parameter | Technical Data |
|---|---|
| Rated Voltage (kV) | 12 |
| Rated Frequency (Hz) | 50 |
| Rated Current (A) | Main Busbar: 630 Load Switch: 630 Fuse Combination: 125 |
| 1 min Power Frequency Withstand Voltage (kV) | Phase-to-phase & to ground: 42 Isolation Fracture: 48 |
| Lightning Impulse Withstand Voltage (kV) | Phase-to-phase & to ground: 75 Isolation Fracture: 85 |
| Rated Short-time Withstand Current (kA) | Main Circuit (4s): 20 Earthing Circuit (4s): 20 |
| Rated Peak Withstand Current (kA) | Main Circuit: 50 Earthing Circuit: 50 |
| Rated Active Load Breaking Current (A) | 630 |
| Rated Closed-loop Breaking Current (A) | 630 |
| Rated Cable-charging Breaking Current (A) | 10 |
| Rated No-load Transformer Breaking Current (A) | 16 |
| Rated Short-circuit Making Current (kA) | Load Switch: 50 Earthing Switch: 50 |
| Rated Short-circuit Breaking Current (kA) | Fuse-switch Combination: 31.5 |
| Transfer Current (A) | 1700 |
| Internal Arcing Withstand (kA/1s) | 20 |
| SF6 Gas Rated Pressure at 20°C | 1.4 bar (Absolute pressure) / 0.04 MPa (Gauge) |
| Annual Leakage Rate of SF6 Gas | ≤ 0.1% |
| Mechanical Life (times) | Load Switch: 10000 Earthing Switch: 2000 |
| Protection Grade | SF6 Gas Compartment: IP67 Switchgear Enclosure: IP4X |
Normal Operating Conditions
| Condition | Operational Limit |
|---|---|
| Altitude | ≤ 2000m (Special requirements can be negotiated) |
| Ambient Temperature | -35°C to +40°C |
| Relative Humidity | Daily average ≤ 95% Monthly average ≤ 90% |
| Seismic Resistance | 8 degrees |
Reliability and Conclusion
Investing in the ZHM7-12 sf6 gas insulated switchgear ensures a virtually maintenance-free and exceptionally secure node for medium-voltage networks. By housing all critical high-voltage components within a robust, IP67-rated stainless steel SF6 gas tank, this unit eliminates risks associated with environmental contamination, offering unparalleled long-term stability for urban, industrial, and specialized infrastructure projects.
FAQ
Yes. The internal stainless steel gas tank features an IP67 protection grade, meaning the high-voltage live parts are completely sealed off. This allows the unit to operate reliably even in areas with severe dirt, high humidity (up to 95% daily average), or potential water immersion.
The SF6 gas is maintained at a rated absolute pressure of 1.4 bar (or a gauge pressure of 0.04 MPa) at 20°C, ensuring optimal insulation and arc-quenching capabilities.
The ZHM7-12 is built for durability. The internal load switch is engineered for a mechanical life of 10,000 operations, while the earthing switch is rated for 2,000 operations.
