HJ-SIS Series (Solid Insulated Switchgear)
Up to 24kV / 100% SF6-Free / Solid Insulation / Ultra-Compact
The HJ-SIS Series Solid Insulated Switchgear represents the future of eco-friendly medium-voltage distribution. By replacing SF6 gas with premium epoxy resin vacuum casting, all high-voltage live parts are completely sealed and shielded. It delivers a 100% maintenance-free lifecycle, zero greenhouse gas emissions, and an ultra-compact footprint (starting at just 400mm width).
Engineered for Extreme Environments:
- ✓ High-Altitude & Extreme Cold Regions
- ✓ Coastal Areas with Heavy Salt Fog & Humidity
- ✓ Heavily Polluted Industrial & Mining Sites
- ✓ Underground Subways & High-Density Urban Hubs
1. 100% SF6-Free & Eco-Friendly
Future-proof your grid against stringent environmental regulations. The HJ-SIS utilizes premium epoxy resin vacuum casting to insulate the vacuum interrupter and main busbars. It completely eliminates the use of SF6 greenhouse gas, permanently removing the risk of gas leakage and the need for gas pressure monitoring.
2. Extreme Environmental Immunity
Since all primary live parts are hermetically cast into solid dielectric modules, the switchgear is entirely unaffected by external atmospheric conditions. It performs flawlessly in high-altitude regions, coastal areas with heavy salt fog, extreme condensation, and heavily polluted industrial sites.
3. Ultra-Compact Space Optimization
Solid insulation allows for drastically reduced phase-to-phase clearances. The standard vacuum circuit breaker unit boasts a width of just 400mm. This ultra-compact architecture saves valuable real estate, making it the ultimate choice for tight underground substations, compact kiosks, and wind turbine towers.
4. Touch-Safe & Fully Shielded
The solid resin modules feature an external conductive shielding layer that is securely grounded. This creates an absolute touch-safe exterior for operators. The functional units are connected via fully insulated solid busbars, ensuring a true 100% dead-front safety profile with a maintenance-free lifecycle.
Technical Specifications
* The parameters below correspond to standard configurations. Voltage ratings (up to 24kV) and busbar capacities are fully customizable to meet your local utility standards.
| Electrical Parameters | |
| Rated Voltage (Ur) | 12kV / 17.5kV / 24kV (Custom configurations available) |
|---|---|
| Rated Frequency | 50 Hz / 60 Hz |
| Rated Normal Current | 630A / 1250A (Higher ratings upon request) |
| Short-Time Withstand Current (Icw) | 25kA / 31.5kA (up to 4s) |
| Peak Withstand Current (Ip) | 63kA / 80kA |
| Lightning Impulse Withstand (BIL) | 75 kV (Phase to Earth) / 85 kV (Isolation Fracture) |
| Power Frequency Withstand Voltage | 42 kV (Phase to Earth) / 48 kV (Isolation Fracture) |
| Mechanical & Physical Properties | |
| Insulation Medium | Epoxy Resin Solid Casting (100% SF6-Free) |
| Operating Mechanism | Spring Energy Storage |
| Enclosure Protection Degree | IP67 (Primary Live Parts) / IP4X (Outer Enclosure) |
| Standard Width (W) | 400 mm (VCB/Busbar) / 500 mm (LBS with Fuse) |
| Standard Depth (D) & Height (H) | 950 mm (D) × 1650 mm (H) |
Extreme Operating Environment
- Ambient Temperature: -40°C to +55°C.
- Altitude: Unrestricted performance at high altitudes (Solid insulation does not suffer from gas density drop).
- Environmental Immunity: Highly recommended for areas with severe pollution, salt fog, heavy condensation, and subterranean dampness.
- Seismic Resistance: Withstands earthquake intensity up to 8 degrees.
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