Outdoor Ring Main Unit
Zhejiang Tianrun Electric Co., Ltd. is one of the leading manufacturers and suppliers of outdoor ring main unit in China. We are committed to providing high quality customized products with competitive price. We warmly welcome you to buy bulk advanced outdoor ring main unit from our factory. Also, quotation is available.
Product Overview
The HWX-12 series outdoor ring main unit (ring network cabinet) is a gas-inflated outdoor RMU developed and produced by our company using internationally advanced technologies, based on the characteristics of distribution networks around the world and the needs of urban cable network transformation. Adopting the RF XGN6-12/24 series SF6 fully sealed and fully insulated ring main switchgear, it features modular design, expandability, full insulation, complete sealing, safety, reliability and maintenance-free operation; it can adapt to relatively harsh environments, is suitable for industrial parks, residential areas, streets, airports, various buildings and commercial centers, and supports expandable distribution network automation functions, helping to achieve intelligentization of the ring network cabinet and improve grid operation.
Product Features
- Diverse configurations: Insulating enclosure with SF6 load switch, or load switch-fuse combination for different circuits.
- Reliable safety: Live parts sealed in SF6 tank; five-prevention interlocking; touchable cable connections; pressure monitoring and relief, internal arc tested.
- Flexible solution: Left / right / bottom cable entry; freely combinable and expandable units; built-in busbar.
- Compact structure: Uniform module size, small, light and easy to operate.
- Cost-effective: Maintenance-free, small footprint, good value and long life.
- Wide application: Stainless steel tank by TIG welding, IP67, suitable for damp, dusty and mining sites.
- Smart option: Motorized mechanism and distribution automation terminals for "four-remote" functions.
Type Designation
Specification
|
Item |
Unit |
Parameter |
|||||
|
C-Load Switch Unit |
F-Combined Apparatus Unit |
V-Circuit Breaker Unit |
|||||
|
Rated Voltage |
kV |
12/24 |
12/24 |
12/24 |
|||
|
Rated Frequency |
Hz |
50 |
50 |
50 |
|||
|
Rated Current |
A |
630 |
125 |
630 |
|||
|
Rated Transfer Current |
A |
/ |
1750 |
/ |
|||
|
Rated Insulation Horizontal |
1min Power Frequency Withstand Voltage (Phase to Ground) |
Phase-to-Phase, Phase-to-Ground |
kV |
/ |
42/65 |
/ |
|
|
Across the Break |
|||||||
|
Lightning Impulse Withstand Voltage |
Phase-to-Phase, Phase-to-Ground |
||||||
|
Across the Break |
|||||||
|
Internal Arc Test (Internal Arcing Test) |
kV |
/ |
48/79 |
/ |
|||
|
Rated Closed-Loop Breaking Current |
kV |
/ |
75/125 |
/ |
|||
|
Rated Active Load Breaking Current |
kV |
/ |
85/145 |
/ |
|||
|
Mechanical Life |
Load/Isolation Switch |
kV |
20 |
315 |
20 |
||
|
Grounding Switch |
|||||||
|
Vacuum Circuit Breaker |
|||||||
|
SF6 Gas Pressure (Absolute Pressure at 20℃) |
kA |
50 |
80 |
50 |
|||
|
Yearly Leakage Rate |
kA |
50 |
/ |
50 |
|||
|
Cabinet and Fuse Protection Level |
kA |
20 |
20 |
20 |
|||
|
Cabinet and Enclosure Protection Level |
kA |
20 |
20 |
20 |
|||
|
Outdoor Ring Main Unit Protection Level |
S |
4 |
/ |
4 |
|||
Operating Environment Conditions
- Ambient Air Temperature: -15℃ ~ +40°℃
- Altitude: 1000m and below (High altitude type can also be provided)
- Temperature and Humidity Conditions: Daily average relative humidity ≤95%
- Daily average water vapor pressure does not exceed 2.2kPa
- Monthly average relative humidity ≤90%
- Monthly average water vapor pressure does not exceed 1.8kPa
- Seismic intensity: not exceeding 8°
- No corrosive or flammable gases or obvious pollutants.
- Note: When the above normal operating conditions are exceeded, the user can negotiate with the company for a solution.
Application
- Urban distribution networks & switching stations: For ring power supply, cable branching and terminal distribution; can form switching stations.
- Residential & civil buildings: For power distribution in high-rise buildings, residential areas and commercial complexes.
- Industrial & mining parks: For MV distribution and load control in factories, mines and manufacturing parks.
- Infrastructure: Airports, railways, tunnels, subways and other places with high reliability requirements.
- Outdoor & harsh environments: IP67 gas tank suitable for streets, damp, dusty and mining sites.
- Urban grid renovation: Suitable for upgrading old urban cable networks and new construction.
- Smart grid: Can work with distribution automation terminals for "four-remote" and intelligent management.
FAQ
Q: What is a box-type ring main unit? How is it different from a box-type substation?
A: The box-type RMU is a compact switchgear with switches, busbars and other components enclosed in a metal gas tank, mainly for ring power supply and terminal distribution. A box-type substation includes a transformer, LV switchgear and complete functions; the RMU usually serves as its HV switching part.
Q: What does "fully insulated and fully enclosed" mean?
A: All live parts and switches are sealed in a stainless steel tank filled with SF6, isolated from external air, dust and moisture, and not exposed to the air.
Q: What is the role of an RMU in a distribution network?
A: It receives and distributes power, acting as a sectionalizing or tie switch in ring circuits to facilitate fault isolation and power restoration.
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