Sf6 Insulated Ring Main Unit RMU 11kV

The Huajidian Sf6 Insulated Ring Main Unit RMU 11kV is an environmentally friendly high-voltage complete set of power distribution equipment that meets national and industry standards and is suitable for 12kV, 50Hz three-phase AC indoor power distribution systems. The product uses environmentally friendly dry air and nitrogen instead of sulfur hexafluoride (SF6) insulation, achieving zero SF6 greenhouse gas emissions throughout its entire lifecycle, aligning with dual-carbon environmental policies.

The equipment integrates load switches, grounding switches, comprehensive protection and measurement units, and intelligent monitoring modules, achieving integrated power distribution control, fault protection, and data monitoring. With its compact structure, fully sealed protection, maintenance-free operation, and strong environmental adaptability, it has been proven in the market over a long period and has become a mainstream product for low-carbon power grid upgrades, making it a preferred high-quality power distribution equipment supplier solution for engineering clients.

Core Technical Parameters

Core Product Functions

1. Flexible Power Supply Switching

The equipment supports multiple power supply modes, including ring network, single-ended, and dual power supply, enabling line segmentation, grid interconnection, and rapid power swapping. This effectively avoids large-scale power outages and ensures continuous and stable power supply for urban power distribution networks, industrial parks, and new energy projects.

2. Comprehensive Fault Protection

Built-in integrated protection device integrates multiple protection functions, including instantaneous overcurrent, zero-sequence, overvoltage, undervoltage, and phase loss protection. It can quickly disconnect faulty lines in milliseconds, preventing fault propagation and significantly improving the safety and stability of power grid operation.

3. Intelligent Remote Monitoring

The SF6 insulated ring main unit RMU 11kV is equipped with a high-precision data acquisition module, which collects real-time data on equipment voltage, current, power, and switch status. It supports remote communication, background monitoring, and automatic fault alarms, enabling unattended intelligent operation of power distribution equipment.

Core Product Advantages

1. Green and Low-Carbon, Adapting to Dual-Carbon Policies

Completely abandons SF6 greenhouse gas insulation technology, using non-toxic and pollution-free dry air and nitrogen as the insulation medium, achieving zero greenhouse gas emissions. This solves environmental pain points such as gas leakage and difficult recycling in traditional equipment, simplifies the project's environmental impact assessment process, and fully complies with national environmental protection and dual-carbon development requirements.

2. Compact Structure, Saving Installation Space

Adopting a vertical, integrated, modular, and compact structure, it is divided into an upper instrument control area, a middle switch operation area, and a lower cable connection area. The cabinet is CNC machined, ensuring high rigidity and protection levels. The volume of a single cabinet is much smaller than traditional ring main units, saving more than 30% of installation space. It supports flexible expansion with multiple circuits and is suitable for confined installation scenarios such as prefabricated substations and small distribution rooms.

3. Five-fold Interlock for Safe and Reliable Operation

The SF6 insulated ring main unit RMU 11kV is equipped with a dual electromechanical five-fold interlock mechanism to prevent five major misoperations: opening and closing under load, accidental opening and closing of circuit breakers, connecting ground wires while energized, closing and energizing grounding switches, and accidental entry into energized compartments. The cabinet door, switches, and grounding mechanism are interlocked, preventing opening while energized, ensuring comprehensive safety for maintenance personnel.

4. Maintenance-Free and Extended Service Life

The core switch unit adopts a fully sealed gas box structure, requiring no refilling or maintenance of the insulating gas for its entire lifespan. Unaffected by external humidity, dust, or condensation, it is suitable for various complex indoor operating conditions, significantly reducing later maintenance and gas replacement costs. The equipment's service life can reach over 30 years.

5. Customized Configuration for Multiple Scenarios

The number of incoming and outgoing circuits, protection parameters, communication configurations, and cabinet dimensions can be customized according to project requirements, providing exclusive power distribution solutions for municipal engineering, new energy power generation, and industrial power consumption scenarios. All products have passed type testing, meet national standards, and can be successfully accepted and connected to the power grid by the relevant authorities.

Real-world Engineering Application Case

Yunnan Qujing Green Power Grid Project

This project is an urban power distribution network upgrade and renovation project. Huajidian environmentally friendly ring main units replaced traditional SF6 ring main units and were applied to the distribution links of urban switching stations. The product's zero-emission and maintenance-free characteristics effectively reduce the carbon emissions and operation and maintenance pressure of the power grid. The equipment has undergone two years of stable operation under humid and complex working conditions, achieving stable power supply and intelligent monitoring of the urban power distribution network, creating a regional low-carbon power grid demonstration benchmark.

FAQ

Q1: Can the performance of dry air/nitrogen insulated ring main units rival that of traditional SF6 ring main units?

A1: The performance fully meets the standards and is even more advantageous. Huajidian 11kV ring main units use high-purity environmentally friendly gas insulation technology. Their insulation performance, short-circuit withstand capability, and breaking capacity all meet the 12kV national standard for power distribution equipment, consistent with the performance of traditional SF6 equipment. It avoids the problems of SF6 gas aging, leakage, and pollution, resulting in stronger environmental adaptability, longer service life, and superior overall performance compared to traditional products.

Q2: Does the environmentally friendly insulated ring main unit require regular gas testing and maintenance?

A2: No routine gas maintenance is required. The core gas box adopts an integral, fully sealed structure, providing lifelong leak protection and eliminating the need for refilling. Unlike traditional SF6 equipment that requires regular pressure testing, leak detection, and gas replenishment, this equipment only requires routine daily inspections, significantly reducing later maintenance costs and manpower investment.

Q3: Can the SF6 insulated ring main unit RMU 11kV be adapted to complex indoor conditions such as high humidity and high dust levels?

A3: Yes, it can. The equipment has an IP30 high protection rating, and the fully sealed gas box can completely isolate external dust, moisture, and condensation. It can operate stably in environments ranging from -10℃ to +40℃, unaffected by indoor humidity and dust accumulation, making it suitable for complex scenarios such as underground power distribution rooms and poorly ventilated transformer substations.

Brand Strength and Service Guarantee

Huajidian has been deeply involved in the R&D and manufacturing of high-voltage environmentally friendly power distribution equipment for over a decade. It possesses a standardized and modern production factory, a full set of professional testing equipment, and a mature technical R&D team, enabling it to independently develop and mass-produce core equipment.

All its products have passed rigorous type testing and industry certifications and are widely used in national power grids, new energy, and municipal infrastructure projects. The brand provides a one-stop, full-process service encompassing customized solutions, manufacturing, on-site installation and commissioning, and after-sales maintenance. Adhering to a product philosophy of green safety and high cost-effectiveness, Huajidian provides reliable overall power distribution equipment solutions to users worldwide.

The main technical parameters of the Environmental Gas Insulated RMU

Main technical parameter of circuit breaker

The main technical parameters of the main circuit (disconnector) of the combined grounding switch on the busbar side

The main technical parameters of the grounding circuit (grounding switch) of the combinedgrounding switch on the busbar side

Main technical parameters of spring energy storage operating mechanism