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
1. Multi-Platform Primary Compatibility
Build your smart grid on the foundation that fits your budget and environmental policy. Our secondary integration technology can be seamlessly applied to any of our 4 primary RMU platforms: Air-Insulated (HJ-AM), SF6 Gas (HJ-GIS), Solid Insulated (HJ-SIS), or Eco-Gas (HJ-Eco).
2. Flawless Factory Hardware Pre-Integration
Eliminate on-site wiring failures and expensive labor costs. We perfectly integrate the primary switchgear with the secondary control units (DTU/FTU) and high-precision sensors directly at our facility. Standardized heavy-duty aviation plug connections ensure robust physical signal transmission, delivering a neat, error-free hardware package to your site.
3. Open-Architecture Automation Ready
We empower your grid without locking you into proprietary software. The Integrated HJ-RMU serves as a robust "Hardware-Ready" platform. Equipped with standard physical interfaces (RS485/Ethernet) and baseline protocols, it provides a clean slate for your local system integrators to execute protocol mapping and connect to your centralized SCADA system smoothly and securely.
4. High-Precision Fault Detection Sensors
Embedded with highly accurate electronic voltage and current sensors (EVT/ECT) or specialized zero-sequence CTs. The system continuously monitors micro-changes in line conditions, providing the precise raw data needed for external automation software to detect single-phase earth faults and short circuits.
Global Factory Acceptance & Turnkey Delivery
Every Smart HJ-RMU undergoes a rigorous integrated FAT (Factory Acceptance Test). We thoroughly verify primary dielectric withstand, aviation plug continuity, and the baseline physical communication of the DTU/FTU terminal. The unit arrives at your site as a fully assembled hardware node, ready for power connection and software commissioning.
Smart Integration Specifications
* The parameters below detail the secondary intelligence hardware layer. Primary electrical parameters will depend on your selected base RMU platform.
| Primary Equipment Compatibility | |
| Compatible Base RMUs | Air-Insulated / SF6 Gas / Solid / Eco-Gas Platforms |
|---|---|
| Operating Voltage Range | 12kV / 17.5kV / 24kV |
| Secondary Hardware & Sensing (DTU/FTU) | |
| Terminal Unit Architecture | Modular Distribution Terminal Unit (DTU) / Feeder Terminal Unit (FTU) |
| Sensing Technology | Integrated Electronic Voltage/Current Sensors (EVT/ECT) |
| Measurement Accuracy | Voltage/Current: Class 0.5S ; Active/Reactive Power: Class 1.0 |
| Hardware Comm. Interfaces | RS485, Ethernet (RJ45) standard (Reserved slots for 4G/5G/LTE modules) |
| Supported Protocol Baseline | IEC 60870-5-101/104, Modbus-RTU/TCP, DNP3.0 (Mapping & integration by local EPC) |
| Internal Connection Method | Heavy-duty IP67 aviation plugs (Pre-wired & Factory Tested) |
| Backup Power Supply | Built-in 24V/48V DC battery system (Maintains hardware comms during power loss) |
Operating Environment
- Ambient Temperature: -40°C to +55°C (Built-in automated heater for anti-condensation in the secondary compartment).
- Electromagnetic Compatibility (EMC): Exceeds IEC 61000-4 standards for industrial harsh environments.
- Installation Site: Outdoor kiosks, road-side compact substations, or underground distribution rooms.
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-GIS Series (SF6 Gas-Insulated RMU)
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