Power System 12kV. 3-phase AC 50Hz
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
The Huajidian 33kV 4/5-way ring main unit is an independently developed and manufactured indoor high-voltage core power distribution equipment, suitable for 12kV/50Hz three-phase AC power systems. It is mainly used for power reception and distribution, as well as line control, protection, monitoring, and metering. Compared to traditional ring main units, this product supports both single-ring and dual-ring power supply modes, and can be flexibly expanded to 4- or 5-way incoming/outgoing lines, solving the industry pain points of traditional power distribution equipment such as limited functionality, poor expandability, and large footprint.
The equipment adopts a fully enclosed metal armored structure, coupled with a standardized compartmentalized isolation design and equipped with comprehensive "five-proof" interlocking functions, effectively preventing safety accidents caused by misoperation. With stable performance and good environmental adaptability, the product is widely applicable to various medium-voltage power distribution engineering construction and renovation projects, making it a highly reputable professional power equipment supplier in the industry.
The 33kV 4/5-way ring main unit uses high-quality cold-rolled steel plates, precisely bent by CNC and assembled with bolts, forming an integrated metal armored fully enclosed structure that is stable and not easily deformed. The cabinet interior is scientifically divided into four independent enclosed compartments: instrument compartment, circuit breaker compartment, busbar compartment, and cable compartment. Each compartment is isolated from the others, effectively curbing the spread of local faults, avoiding mutual interference between components, and significantly improving equipment operational safety.
The cabinet boasts an IP30 protection rating, effectively preventing dust, moisture, and foreign object intrusion. It is suitable for complex indoor working conditions, ensuring the long-term stable operation of internal precision components.
1. Upper Instrument Room: Centrally houses core components such as voltmeters, ammeters, integrated protection devices, circuit breaker buttons, and energy storage switches. Equipment operating parameters are visualized in real time, facilitating continuous monitoring and adjustment of equipment status by staff.
2. Middle Circuit Breaker Room: Integrates load switches, vacuum circuit breakers, grounding switches, and operating mechanisms. Equipped with red and green circuit breaker indicator lights and professional mechanical interlocking devices, the operating status is intuitive, and mechanical control is precise and reliable.
3. Lower Cable Room: Features a pre-installed grounding switch operating hole, independent pressure relief channel, and ventilation hood. The layout is standardized and organized, simplifying daily operation, maintenance, and troubleshooting.
In terms of safety, the equipment employs mechanical and electrical dual interlocking protection, comprehensively implementing five anti-misoperation functions: prohibiting the opening and closing of disconnect switches under load, prohibiting accidental opening and closing of circuit breakers, prohibiting the connection of grounding wires while energized, prohibiting closing the circuit breaker with the ground wire connected, and prohibiting accidental entry into energized compartments, ensuring the safety of personnel and equipment in all aspects.
It can precisely control the opening and closing of lines, flexibly complete the switching of power supply modes such as ring network, segmented, and interconnected, optimize the power grid operation architecture, and ensure the continuous and stable operation of the distribution network.
It has a built-in high-performance integrated protection device with multiple protection functions such as overcurrent, instantaneous trip, zero sequence, undervoltage, and overvoltage. When overload, short circuit, or other faults occur on the line, it can quickly disconnect the fault circuit, prevent the fault from spreading, and avoid large-scale power outages and equipment damage.
The grounding switch, circuit breaker, and cabinet door are interlocked. The cabinet door cannot be opened while energized, and the circuit breaker cannot be closed without reliable grounding, eliminating safety hazards such as live work and accidental entry into energized areas at the source.
Integrating high-precision instruments and intelligent protection units, it can monitor and statistically analyze operating data such as voltage, current, and power in real time, supporting remote monitoring and adapting to the intelligent management needs of modern smart grids.
Each independent compartment is equipped with a dedicated pressure relief channel. In the event of an arc fault inside the equipment, it can automatically and instantly relieve pressure, preventing cabinet deformation and damage, and protecting surrounding supporting power distribution equipment.
1. Stringent Quality, Compliance Standards:
Core components are selected from well-known industry brands, and the cabinet has excellent corrosion resistance and rust prevention performance. All equipment undergoes rigorous testing before leaving the factory, including withstand voltage, insulation, and interlocking performance tests, and possesses complete type test reports, complying with national high-voltage electrical standards and power grid connection acceptance specifications.
2. Modular Design, Low Operation and Maintenance Costs
The 33kV 4/5-way ring main unit adopts a detachable, independent modular compartment structure, ensuring that each functional module does not interfere with others. Routine component replacement and equipment maintenance do not require large-scale disassembly, significantly shortening operation and maintenance time, reducing labor and maintenance costs, and improving equipment operating efficiency.
3. Personalized Customization, Adaptable to Multiple Scenarios
Huajidian can customize solutions according to customer project needs, flexibly adjusting the number of incoming and outgoing circuits, and offering optional circuit breakers/load switches to tailored protection schemes, meeting the differentiated needs of various industrial and civil power distribution projects.
1. Core power distribution equipment for urban power grid ring networks, switching stations, and substations, adaptable to new and old power grid construction and renovation projects;
2. High-voltage power distribution rooms and workshop power supply control systems in industrial and mining enterprises and chemical plants;
3. Power distribution rooms in commercial complexes, residential communities, and office buildings;
4. Supporting switchgear for photovoltaic and wind power booster stations and box-type substations;
5. Power supply guarantee systems for key locations such as rail transit, hospitals, schools, and data centers.
A distributed photovoltaic power generation project in North China uses Huajidian 33kV 4-way ring main unit as the core grid-connected power distribution equipment for the booster station. The equipment can flexibly switch power supply modes and quickly isolate faults, perfectly adapting to the intermittent and fluctuating characteristics of photovoltaic power generation, stabilizing grid-connected power quality, and achieving safe grid connection and efficient power distribution of new energy. The project operates stably, effectively improving the local new energy absorption capacity and providing reliable equipment support for the construction of a green power grid.
Q1: What are the applicable voltage system and environmental requirements for the Huajidian 33kV 4-way ring main unit?
A: This product is specifically designed for 12kV three-phase AC 50Hz power distribution systems, with an IP30 protection rating, suitable for dry and clean indoor power distribution environments. It is applicable to ambient temperatures of -10℃ to +40℃ and altitudes ≤1000m, and can stably adapt to typical working conditions such as urban power grids, industrial parks, and commercial supporting power distribution rooms.
Q2: What safety mechanisms are in place during equipment operation?
A: The equipment has multiple safety protection systems: First, it is equipped with a complete set of "five-proof" electromechanical double interlocks to eliminate various risks of misoperation; second, it features an independent compartment design to prevent the spread of faults; third, it has an independent pressure relief channel to handle internal arcing faults; fourth, it is equipped with multiple protection functions such as overload and short circuit protection, which can quickly disconnect faulty circuits and comprehensively ensure the safety of personnel and equipment.
Q3: Does the product support customization and future expansion?
A: Yes. The product adopts a modular and expandable design, allowing flexible switching between 4/5 incoming/outgoing line schemes, and adapting to single-ring and dual-ring power supply modes. Simultaneously, the number of incoming and outgoing lines, switch types, and customized protection schemes can be tailored to project requirements. The modular structure allows for future equipment expansion and functional upgrades without large-scale modifications to the power distribution system.
Huajidian has been deeply involved in the high-voltage power distribution equipment field for many years, focusing on the R&D, production, and sales of complete sets of power equipment such as high-voltage switchgear, ring main units, and prefabricated substations. The company possesses modern, standardized production workshops, professional precision testing equipment, and a senior technical R&D team, enabling independent R&D and customized production capabilities.
Address
Room 2106, West End, Guangfeng Building, Ouhai District, Wenzhou City, Zhejiang Province, China
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