Product Introduction
The 10kV SF6 gas-insulated ring main unit (RMU) is designed for medium-voltage power distribution systems in industrial facilities, commercial buildings, residential developments and utility networks. Operating at 10kV and 50Hz, it provides switching, isolation and distribution functions to support reliable power supply.
The equipment features a compact structure with main switching components installed inside a sealed gas-insulated compartment. Its modular design allows different functional units to be combined according to project requirements, making it suitable for both conventional distribution networks and intelligent power distribution applications.
With flexible configuration options and integrated safety features, this RMU offers a practical solution for distribution network expansion, renovation and infrastructure development.
Applications and Configuration Options
The 10kV gas-insulated RMU can be used in a variety of medium-voltage distribution projects:
- Utility distribution networks: Supports feeder switching, network sectionalizing and distribution network modernization.
- Industrial plants: Provides medium-voltage feeder arrangements for factories, manufacturing facilities and industrial parks.
- Commercial and residential projects: Suitable for distribution systems in office buildings, shopping centers and residential communities.
- Infrastructure facilities: Can be considered for municipal projects, rail-related power systems, mining facilities and oilfield installations, subject to site requirements.
Available configurations may include ring incoming and outgoing feeders, transformer protection units, metering sections and other functional modules. The final arrangement should be determined by the single-line diagram, protection requirements and operating strategy of the project.
Main Technical Features and Benefits
Sealed Gas-Insulated Design
The main switching circuit is housed in a sealed compartment filled with SF6 insulating gas. This structure helps protect internal components against dust and moisture and reduces exposure to external environmental conditions. The specified annual gas leakage rate is ≤0.1%.
Mechanical Interlocking
The mechanical interlocking system is designed to prevent prohibited switching sequences and support safe operating procedures. The actual interlocking arrangement depends on the selected equipment configuration.
Modular Construction
Standardized functional units allow flexible combinations of incoming feeders, outgoing feeders, transformer protection and metering functions. This helps adapt the equipment to different distribution layouts.
Protective Enclosure
The cabinet can be manufactured from stainless steel or aluminum-zinc-coated steel sheet. Cabinet protection ratings of IP43 or IP54 are available, while the sealed gas compartment is specified at IP67.
Intelligent Monitoring Options
With compatible secondary control devices, the RMU can support remote status monitoring, measurement, fault indication and remote operation. Communication interfaces should be selected according to the project's automation system.
Compact Installation
The integrated design helps reduce installation space requirements. Factory assembly and inspection can simplify site installation, subject to the approved installation drawings and commissioning procedures.
Technical Specifications
| Parameter | Specification |
Rated voltage | 10kV |
Rated frequency | 50Hz |
Rated current | 630A |
Rated short-time withstand current | 20kA / 25kA for 1 second |
Rated peak withstand current | 50kA / 63kA |
Power-frequency withstand voltage | 42kV for 1 minute |
Lightning impulse withstand voltage | 75kV |
Insulating medium | SF6 |
Annual gas leakage rate | ≤0.1% |
Switching arrangement | Three-position load switch, according to configuration |
Cabinet protection rating | IP43 / IP54 |
Gas compartment protection rating | IP67 |
Mechanical operating life | ≥10,000 operations |
Cabinet material | Stainless steel / aluminum-zinc-coated steel sheet |
The standard operating temperature range is -25°C to +40°C, with customized solutions potentially available for -40°C to +55°C. Standard installation altitude is up to 2,000m, while special designs for higher altitudes may be evaluated up to 4,000m.
Special requirements concerning humidity, corrosion resistance, salt spray, enclosure protection and installation conditions should be confirmed during technical evaluation.
Note: The listed specifications should be verified against the final model datasheet and approved technical documents before ordering.
Engineering Selection and Quality Requirements
Selecting a suitable RMU requires evaluation of the electrical system, installation environment and project operating conditions.
Key selection factors include rated current, short-circuit withstand level, feeder quantity, switching arrangement, transformer protection, metering requirements and communication interfaces. For installations in demanding environments, cabinet material, protection rating, ambient temperature and altitude should also be considered.
Relevant standards specified for this product range include GB/T 3906, GB/T 11022 and IEC 62271, where applicable to the selected equipment type and configuration. Buyers should confirm the applicable standards, type-test documentation, certification status and local utility requirements for the exact model offered.
For overseas projects, early review of the single-line diagram and technical specifications can help reduce design revisions and improve coordination among the equipment supplier, electrical contractor and project engineering team.
Customized Solutions and Request for Quotation
We provide configuration support for 10kV gas-insulated ring main units according to project requirements. To prepare a suitable technical proposal and quotation, please share the following information:
- System voltage, frequency and required rated current.
- Short-circuit withstand requirements and protection scheme.
- Single-line diagram and number of incoming and outgoing feeders.
- Transformer feeder, metering and earthing requirements.
- Indoor or outdoor installation conditions, site altitude and ambient temperature.
- Required enclosure protection, communication interfaces and automation functions.
- Destination country, applicable standards and expected delivery schedule.
Based on the information provided, our team can evaluate the required configuration and offer a corresponding technical proposal, quotation and delivery plan.
Need a 10kV Ring Main Unit for Your Project?
Contact our team to discuss your medium-voltage distribution requirements and identify a suitable SF6 gas-insulated RMU configuration for your application.
