HJ-GIS Series (SF6 Gas-Insulated RMU)
HJ-GIS Series (Engineering Model: HSRM16-12)
Product Overview & Application
Product Concept: The HJ-GIS Series is an IEC-compliant, fully-insulated SF6 Gas Ring Main Unit. With all primary high-voltage circuits and switching components robotically sealed inside a stainless-steel tank (IP67), it offers true “Fit and Forget” performance for long-term reliability.
Applicable Scenarios: Compact Secondary Substations (CSS), heavy industrial distribution networks, underground vaults, and extreme coastal environments prone to high humidity and salt spray.
Customization Value: Featuring an infinitely modular extensible design, its compact modules (C, F, V) can be seamlessly combined and expanded on-site to match any complex Single-Line Diagram (SLD) requirement.
1. Hermetically Sealed IP67 Gas Tank
True "Fit and Forget" reliability. All main circuits, busbars, and switching components are completely enclosed in a robotically welded stainless-steel tank filled with SF6 gas at 1.4 bar. This ensures an IP67 protection level for live parts, providing absolute immunity against flooding, condensation, dust, and corrosive coastal air.
2. Ultra-Compact Space Optimization
By utilizing the exceptional dielectric strength of SF6 gas, the phase-to-phase clearances are drastically reduced. This allows the HJ-GIS to maintain a remarkably small footprint, minimizing civil engineering costs and making it the undisputed choice for installation in tight urban corridors and underground vaults.
3. Infinite Modular Extensibility
Future-proof your distribution network. The switchgear features specialized plug-in solid busbar connectors, allowing for seamless Left, Right, or Bilateral extensions on-site without gas handling. You can freely combine Load Break Switches (C-Module), Switch-Fuse Combinations (F-Module), and Vacuum Circuit Breakers (V-Module) as your grid expands.
4. SCADA-Ready & Motorized Automation
Ready for smart grid integration. Every module can be factory-fitted with motorized operating mechanisms and highly accurate current/voltage sensors. Paired with a Remote Terminal Unit (RTU/DTU), it enables rapid remote fault isolation and automated network reconfiguration to minimize downtime.
Global Factory Acceptance & Turnkey Support
Every HJ-GIS unit undergoes rigorous partial discharge (PD) testing and helium leak detection to ensure absolute gas-tightness before dispatch. Engineered strictly according to IEC 62271 standards, these compact modules can be freely extended and combined to fit any complex ring network topography flawlessly.
Module Technical Specifications Matrix
* The parameters below correspond to standard configurations. Custom voltage ratings (up to 24kV) and specialized metering (M/PT) modules are fully available upon request.
| Technical Parameter | C-Module (Load Break Switch) |
F-Module (Switch-Fuse Combo) |
V-Module (Vacuum Circuit Breaker) |
|---|---|---|---|
| Rated Voltage (Ur) | 12kV (Up to 24kV) | 12kV (Up to 24kV) | 12kV (Up to 24kV) |
| Rated Current (Ir) | 630A | 125A | 630A / 1250A |
| Power Frequency Withstand Voltage | 42kV (Phase-to-Earth/Phase-to-Phase) / 48kV (Across open contacts) | ||
| Lightning Impulse Withstand (BIL) | 75kV (Phase-to-Earth/Phase-to-Phase) / 85kV (Across open contacts) | ||
| Short-Time Withstand Current (4s) | 20kA / 25kA | - | 20kA / 25kA |
| Peak Withstand Current | 50kA / 63kA | - | 50kA / 63kA |
| Rated Short-Circuit Breaking Current | - | 31.5kA (Fuse link limit) | 20kA / 25kA |
| Active Load Breaking Current | 630A | - | - |
| Cable Charging Breaking Current | 25A | 25A | 25A |
| Mechanical Endurance (Operations) | 5,000 | 5,000 | 10,000 |
| Protection Degree (Tank / Enclosure) | IP67 (Gas Tank) / IP4X (Outer Enclosure) | ||
Standard Operating Environment
- Ambient Temperature: -35°C to +40°C (Maximum 24h average ≤ +35°C).
- Relative Humidity: Daily average ≤ 95%, Monthly average ≤ 90%.
- Annual Gas Leakage Rate: ≤ 0.05% / year (Ensures 30+ years of operational life).
- Immersion Test Passed: Can withstand being submerged under 0.3 bar of water pressure for 24 hours.
Model Nomenclature
HSRM16 - 12 - [Module] / [Current] - [Extension] - [Cable Exit]
- [Module]: C (LBS), F (Fuse Combo), V (VCB), PT, M (Metering)
- [Current]: 630A or 1250A
- [Extension]: I (Left), D (Right), ID (Bilateral)
- [Cable Exit]: L (Left), R (Right), LR (Bilateral)
Standard Dimensions
| Module Designation | W × D × H (mm) |
|---|---|
| C-Module / F-Module | 500 × 950 × 1650 |
| V-Module / PT-Module | 400 × 950 × 1650 |
Dimensions reference model HSRM16-12 standard configuration.
Related products
HJ-AM Series (Air-Insulated Metal-Enclosed RMU)
Up to 24kV / Air-Insulated / Highly Customizable
The HJ-AM Series Air-Insulated Metal-Enclosed RMU is the highly reliable and economically optimized foundation for secondary medium-voltage distribution. Utilizing ambient air as the primary insulation medium combined with maintenance-free SF6 load break switches or vacuum circuit breakers, it delivers exceptional operational safety, visible fault isolation, and modular flexibility. It is the definitive cost-effective choice for standard indoor substations. Ideal for Secondary Indoor Distribution:- ✓ Commercial Buildings & Residential Complexes
- ✓ Light Industrial Parks & Manufacturing Facilities
- ✓ Urban Secondary Substations & Switching Stations
- ✓ Infrastructure Upgrades with Strict Budget Controls
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
HJ-RMU Series Modular Ring Main Unit (Smart Integrated Edition)
12kV-24kV / Factory Pre-Wired / SCADA Hardware-Ready
The HJ-RMU Series Modular Ring Main Unit (Smart Integrated Edition) is an advanced, hardware-ready distribution automation platform designed for modern smart grids. By seamlessly integrating your choice of primary switchgear (Air, SF6, Solid, or Eco-Gas) with secondary terminal units (DTU/FTU) and high-precision sensors directly at our factory, we eliminate complex on-site wiring. It provides a robust, open-architecture foundation for your local system integrators to execute rapid SCADA deployment. Ideal for Automated Distribution Networks:- ✓ Unmanned Remote Secondary Substations
- ✓ Smart City Grid Self-Healing Networks
- ✓ Critical Facilities Requiring High Reliability
- ✓ Renewable Energy Grid Integration Nodes
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