HJ-Eco Series (Eco-Gas Insulated RMU)
12kV / 100% SF6-Free / Vacuum Switching / Zero GWP
The HJ-Eco Series Eco-Gas Insulated RMU is the ultimate sustainable solution for medium-voltage distribution. By completely eliminating SF6 greenhouse gas and utilizing a clean, eco-friendly gas mixture (Dry Air or N2) combined with premium vacuum arc extinguishing technology, it delivers a Global Warming Potential (GWP) of strictly less than 1. Designed with integrated smart grid monitoring, it is the premier choice for utility upgrades aiming to meet strict carbon-neutrality mandates without compromising on compact size or reliability.
Ideal for Green Infrastructure & Eco-Conscious Grids:
- ✓ EU & Global Utilities under strict F-gas (SF6) regulations
- ✓ LEED-Certified Commercial Buildings & Hospitals
- ✓ Underground Metro Systems & Public Transportation
- ✓ Green Smart City Upgrades & Eco-Industrial Parks
1. 100% SF6-Free & Zero Carbon Tax
Bypass strict environmental regulations and impending SF6 bans. The HJ-Eco series utilizes clean, dry air or N2 mixtures as its primary insulation medium. With a Global Warming Potential (GWP) of < 1, it eliminates toxic byproducts, avoids costly greenhouse gas reporting, and ensures your project's compliance with top-tier ESG mandates.
2. Fail-Safe Zero Gauge Pressure Design
Unlike traditional GIS that rely heavily on high gas pressure for insulation, the HJ-Eco operates at a micro-positive pressure (≤0.02MPa). More importantly, its internal electrical clearances are engineered so that even if the tank pressure drops to absolute zero (0 MPa gauge), it still perfectly satisfies full air-insulation withstand requirements, providing unmatched fail-safe reliability.
3. Premium Vacuum Arc Extinguishing
Since the eco-gas is purely for insulation, the critical task of breaking high-voltage currents is handled by dedicated Vacuum Interrupters (VI). Vacuum switching offers significantly faster arc quenching, vastly superior short-circuit breaking capacity, and extends the mechanical endurance to an impressive 10,000 operations without any maintenance.
4. Smart Grid & Advanced Diagnostics
Built for the future of distribution. This RMU isn't just a switch; it's an intelligent node. Fully integrated with data acquisition, online monitoring, and advanced predictive analysis, it seamlessly connects to centralized SCADA systems. It allows operators to execute remote energy management, fault localization, and system optimization with unprecedented clarity.
Global Factory Acceptance & Turnkey Support
Every HJ-Eco unit undergoes rigorous partial discharge (PD) testing and helium leak detection to ensure absolute gas-tightness before dispatch. Housed in an IP67 fully sealed stainless-steel tank, these compact modules (C, F, V) can be freely extended and combined to fit any complex ring network topography flawlessly.
Module Technical Specifications Matrix
* The parameters below correspond to standard 12kV Eco-Gas configurations. Exceptional short-time withstand capacities (up to 31.5kA / 4s) demonstrate extreme heavy-duty capability.
| Technical Parameter | C-Module (Load Break Switch) |
F-Module (Switch-Fuse Combo) |
V-Module (Vacuum Circuit Breaker) |
|---|---|---|---|
| Rated Voltage (Ur) | 12kV | ||
| Rated Current (Ir) | 630A | 125A | 630A / 1250A |
| Power Frequency Withstand Voltage (1 min) | 42kV (Phase/Earth) / 48kV (Across isolation gap) | ||
| Lightning Impulse Withstand (BIL) | 75kV (Phase/Earth) / 85kV (Across isolation gap) | ||
| Short-Time Withstand Current (4s) | 25kA | - | 25kA / 31.5kA |
| Peak Withstand Current | 63kA | - | 63kA / 80kA |
| Rated Short-Circuit Breaking Current | - | 31.5kA (Fuse link limit) | 25kA / 31.5kA |
| Active Load Breaking Current | 630A | - | - |
| Mechanical Endurance (Operations) | 5,000 | 5,000 | 10,000 |
| Arc Extinguishing Technology | Vacuum Interrupter | ||
| Operating Gas Pressure (20°C) | 0.025 MPa (Micro-positive pressure) | ||
| Protection Degree (Tank / Enclosure) | IP67 (Gas Tank) / IP4X (Outer Enclosure) | ||
Standard Operating Environment
- Ambient Temperature: -25°C to +40°C (Maximum 24h average ≤ +35°C).
- Altitude: ≤ 2000m (Solid insulation support elements unaffected by high altitude).
- Relative Humidity: Daily average ≤ 95%, Monthly average ≤ 90%.
- Annual Gas Leakage Rate: ≤ 0.05% / year (Hermetically sealed laser-welded tank).
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