Medium Voltage Outdoor Ring Main Unit RMU

The Huajidian medium voltage outdoor ring main unit RMU is a high-performance, customizable medium voltage power distribution device independently developed for complex power distribution scenarios. It is suitable for industrial power distribution, urban power grid transformation, new energy grid connection, and public facility power supply scenarios. It adopts an integrated modular fully enclosed insulated structure, integrating core components such as circuit breakers, disconnect switches, transformers, and protection devices.

Compared to traditional ring main units, this product features a visual observation window and a remote intelligent monitoring interface, enabling precise full-cycle control and real-time status monitoring. It supports multi-voltage level adaptation and personalized customization. Effectively addressing the pain points of traditional outdoor power distribution equipment, such as poor safety, cumbersome maintenance, and insufficient intelligence, it is a core upgrade device for modern intelligent power distribution systems.

Core Product Advantages

1. Excellent Insulation Performance, Adaptable to Complex Environments

The equipment adopts a fully enclosed gas-filled insulation or solid insulation structure (optional), completely blocking the intrusion of external dust, moisture, and foreign objects, eliminating safety hazards such as short circuits and leakage caused by environmental interference. The cabinet is constructed of high-strength cold-rolled steel plate, with outstanding corrosion resistance and rust prevention, allowing for long-term stable operation in harsh outdoor environments such as high humidity, dust, and large temperature differences, demonstrating extremely strong environmental adaptability.

2. Multi-dimensional Safety Protection, Eliminating the Risk of Misoperation

The high-voltage area of the medium voltage outdoor ring main unit RMU is equipped with a professional safety interlock device, which effectively prevents accidental opening or closing of the cabinet, ensuring the personal safety of maintenance personnel and the safe operation of equipment. It also features prominent high-voltage warning signs, a red emergency operation button, and safety interlock lock holes, constructing a full-link safety protection system to completely avoid maintenance risks.

3. Visualized Intelligent Maintenance, Reducing Costs and Increasing Efficiency

A transparent viewing window in the middle of the cabinet allows for direct observation of the operating status of core components such as circuit breakers and busbars without opening the door, enabling safe and efficient inspections. Reserved RS485 and Ethernet remote monitoring interfaces allow seamless integration with power monitoring systems, supporting remote data acquisition, fault early warning, and automatic fault isolation, achieving unmanned intelligent maintenance and significantly reducing manual maintenance costs.

4. Modular Design, Supporting Personalized Customization

The overall modular structure design allows for independent maintenance of the left and right functional cabinets, while the main cabinet integrates core components, simplifying subsequent maintenance processes and improving maintenance efficiency. The product can be customized in terms of cabinet size, functional modules, and communication protocols according to actual project needs, fully adapting to the differentiated power distribution requirements of various scenarios.

Technical Parameters

Product Structure Details

1. Top Instrument Area: Integrates voltmeters, ammeters, indicator lights, and other monitoring instruments, displaying real-time equipment operating data for easy monitoring by maintenance personnel.

2. Middle Operation and Observation Area: Centrally arranged operation buttons, control knobs, and a transparent observation window, integrating operation control and visual monitoring functions for convenient and safe operation.

3. Lower Functional Module Area: Equipped with independent functional units and standard warning signs, with clear module divisions, allowing for individual replacement and maintenance of single-module equipment, effectively reducing downtime.

The overall equipment features a metal cabinet + modular unit structure, equipped with independent safety interlock lock holes and emergency operation devices, achieving high integration and high safety operation of the power distribution equipment.

Application Scenarios

1. Industrial and Park Power Distribution

Suitable for power distribution rooms in factories and industrial parks, providing stable power distribution and reliable fault protection for industrial equipment, ensuring continuous production operation.

2. Urban Distribution Network Construction

As a node in the urban medium-voltage distribution network ring network, it enables line load switching, effectively improving the reliability of urban power supply and optimizing the power grid operation structure.

3. New Energy Grid Connection

It can be used in grid connection cabinets for new energy power plants such as photovoltaic and wind power, adapting to the volatility of clean energy generation and achieving safe and stable grid connection.

4. Public Building Power Supply

It is suitable for medium and low voltage power distribution systems in public buildings such as commercial complexes, hospitals, and schools, ensuring the stable and safe operation of public facilities.

Real-world Engineering Case

1. Project Background: In 2025, a municipal urban distribution network upgrade project in Central China encountered problems with aging, low-level intelligence, and slow fault response equipment, resulting in frequent power supply fluctuations and time-consuming maintenance, seriously affecting the stability of electricity use for urban residents and businesses.

2. Project Solution: This project involved the batch installation of 12kV Huajidian intelligent outdoor medium-voltage RMUs, covering urban road ring network nodes and community supporting distribution points. Relying on remote equipment monitoring and automatic fault isolation functions, it achieved fully intelligent management and control of the regional distribution network, and customized high-temperature and high-humidity resistant configurations for complex outdoor operating conditions.

3. Project Results: After commissioning, the time for fault location and isolation in the regional power distribution network was reduced by more than 80%, enabling rapid load transfer on faulty lines, significantly improving the reliability of urban power supply, and achieving zero-perception of power outage maintenance for users. The equipment has been operating stably for more than 12 months without any safety failures, fully verifying the high reliability and intelligent advantages of Huajidian RMU in urban power grid transformation scenarios.

Service Guarantee

Huajidian provides one-stop service for the entire lifecycle of outdoor medium-voltage RMUs, supporting personalized customization of cabinet size, functional modules, communication protocols, etc. It also provides 24/7 response service, including on-site installation guidance, operation and maintenance training, and lifetime after-sales maintenance, comprehensively solving various problems related to equipment installation, operation, and subsequent maintenance for customers.

FAQ

Q1: What harsh outdoor environments can Huajidian medium voltage outdoor ring main unit RMU adapt to?

A1: This product has extremely strong environmental adaptability, applicable temperature range -25℃~+40℃, altitude ≤1000 meters. The high-strength cold-rolled steel cabinet is rust-proof and corrosion-resistant, and its fully enclosed insulation structure can resist the intrusion of outdoor dust, moisture, and foreign objects. It can operate stably for a long time in harsh outdoor environments with high humidity, dust, and large temperature differences, outperforming traditional ordinary ring main units.

Q2: Does the equipment support intelligent remote operation and maintenance? What intelligent functions does it have?

A2: The equipment is equipped with a complete intelligent operation and maintenance system, and comes standard with RS485 and Ethernet remote interfaces, which can be connected to power monitoring systems. It supports remote acquisition of operating data such as voltage, current, and load, automatic fault location, isolation, and remote early warning, enabling unattended operation, effectively reducing manual inspection costs, and improving the intelligent management level of the power distribution system.

Q3: Does the medium voltage outdoor ring main unit RMU support project customization? What are the customizable features?

A3: Huajidian supports full-dimensional personalized customization services. The cabinet size, internal functional modules, communication protocols, insulation media, and rated parameters can be customized according to project requirements. At the same time, it can be matched with exclusive protection levels and structural designs for different scenarios such as urban power grids, new energy power plants, and industrial parks to meet the differentiated power distribution needs of various projects.