Medium Voltage distribution panel
The HXGN-12(SF6) AC High-Voltage Metal-enclosed Ring Main Unit (RMU) is an indoor, box-type, fixed switchgear that uses SF6 gas as the insulation and arc-extinguishing medium. It is primarily used in distribution systems with a rated voltage of 12kV and frequency of 50Hz for ring main power supply and terminal distribution. Known for its compact structure, flexible operation, reliable interlocking, easy installation, and wide applicability, it is an ideal power distribution solution for urban power grids, industrial and mining enterprises, various buildings, and infrastructure projects.
The HXGN-12 (SF6) AC Metal-Enclosed Ring Main Unit is an indoor, modular, and sealed switchgear designed for 12kV medium-voltage distribution networks. It uses SF6 gas as the insulation and arc-extinguishing medium, ensuring superior safety, compact structure, and long-term reliability. Ideal for urban power grids, substations, industrial and mining enterprises, commercial buildings, and infrastructure projects, this RMU supports both ring main and terminal power supply configurations.
Parameter Category | Technical Specifications |
Rated Characteristics | Rated Voltage: 12kV |
Insulation Level | 1min Power Frequency Withstand Voltage: Phase-to-Phase & Phase-to-Ground 42kV, Isolating Distance 48kV |
Short-circuit Parameters | Rated Short-time Withstand Current (3s): 20kA, 25kA |
Control Circuit | Voltage: DC 110V/220V, AC 110V/220V |
Protection Degree | Enclosure: IP3X; SF6 Gas Chamber: up to IP67 |
Dimensions (W×D×H) | Common: 500mm × 1000mm × 1850mm; Others like 420×840×1600(1800), 500×840×1600(1800), 750×840×1600(1800), 375×940×1650(1850), etc. |
Compliance Standards | GB 3804, GB 3906, GB/T 11022, IEC 298, IEC 60420 |
1. Excellent Electrical Performance and Insulation Reliability
Utilizes SF6 gas for high insulation and efficient arc extinction.
Main components are sealed within epoxy resin-filled SF6 chambers (IP67), ensuring long-term, maintenance-free operation.
Supports making and breaking of rated load currents and transformer no-load currents, with fuse combinations interrupting high short-circuit currents up to 31.5kA.
2. Safe and Reliable Design and Construction
High-strength enclosure made from aluzinc or stainless steel, offering corrosion and oxidation resistance.
Comprehensive five-prevention interlocking system to avoid incorrect operations and ensure operator safety.
Internal arc-resistant design with pressure relief channels to safeguard personnel in case of faults.
3. Flexibility and Modular Design
Compact and modular design allows easy expansion and integration into existing systems.
Supports multiple operation types — manual and electric mechanisms.
Compatible with different switch types such as SF6 load switch, SF6/Vacuum circuit breaker, and load switch-fuse combinations.
4. Environmental Adaptability and Long Service Life
Stable operation under high humidity, pollution, salt-fog, or altitude conditions (up to 2000m or more).
Sealed SF6 system with leakage rate ≤0.01%/year, ensuring a service life of over 30 years.
Low maintenance and long-term reliability for demanding environments.
Urban Power Grids: Distribution network construction and renovation, switching stations.
Industries and Enterprises: Industrial and mining enterprises, small secondary substations.
Buildings and Communities: High-rise buildings, residential complexes, shopping malls, schools, hospitals, parks.
Infrastructure: Packaged substations, cable branch boxes, public utilities like water treatment plants.
Terminal Distribution and Ring Main Supply: Serving as ring main units and for terminal distribution.
Main Switch Options: SF6 load switch (e.g., FLN36-12D), SF6 load switch - fuse combination, Vacuum circuit breaker (e.g., VS1 type).
Operating Mechanisms: Manual operating mechanism, Electric operating mechanism.
Extended Functions: Equipped with PTs (Voltage Transformers), CTs (Current Transformers), FTUs (Feeder Terminal Units), communication devices for distribution automation; Adding capacitive voltage indicators, auxiliary contacts, trip coils, etc.
Special Environments: Configurations available for higher protection degrees (e.g., IP4X) or special environments (e.g., high altitude, high humidity).
Enclosure Dimensions and Combination: Various width, depth, and height options available, can be combined in multi-cabinet arrangements or used alongside other switchgear types.
