Dingli Electric's main products include five series: environmentally friendly ring network cabinets, environmentally friendly high-voltage metering cabinets, deeply integrated pole-mounted switches, European-style box-type transformers, Siemens-authorized NXAirsLP medium-voltage cabinets and SIVACON 8PT low-voltage cabinets, and Eaton-authorized RVAC series ring network cabinets, etc.
DLNH
Environmentally friendly gas-insulated ring main unit
Modern power grid systems prioritize eco-resource utilization, driving the demand for medium-voltage switchgear with low losses, minimal operating costs, high reliability, and flexible configurations. Rapid urbanization further underscores the need to enhance underground cable distribution networks, particularly in equipment optimization. As a critical component for cable network protection and segmentation, ring main units (RMUs) are widely adopted in urban grids due to their safety, compact design, and cost-effectiveness.
Product Classification:
Key words:
- Product Overview
Modern power grid systems prioritize eco-resource utilization, driving the demand for medium-voltage switchgear with low losses, minimal operating costs, high reliability, and flexible configurations. Rapid urbanization further underscores the need to enhance underground cable distribution networks, particularly in equipment optimization. As a critical component for cable network protection and segmentation, ring main units (RMUs) are widely adopted in urban grids due to their safety, compact design, and cost-effectiveness.
Developed by DingLi Electric through advanced simulation technologies and decades of expertise in RMU design, production, and operation, the DLNH gas-insulated RMU represents a next-generation solution for power distribution systems. Designed for three-phase AC 12kV/50Hz secondary distribution networks, it is extensively deployedin:Utility grids,Residential complexes,Industrial plants,Airports, railways, tunnels,High-rise buildings.This product significantly improves power supply reliability, utilization efficiency, and space optimization.
DingLi Electric has achieved significant innovations in eco-design, compact sizing, digital integration, and maintenance-free operation. Notably, it pioneered the development of 10kV fully sealed, fully insulated metering cabinets, substantially enhancing power supply reliability and safety.
Adhering to the principles of "advanced reliability, operational safety, and system stability", DingLi Electric continuously delivers premium products, cutting-edge technologies, and tailored solutions. Rooted in technological innovation, the company strives to provide partners with high-stability, cost-effective products and services, driving sustainable growth in the power distribution sector.
- Product Structural Characteristics
Suitable for smart grids: The product design reserves functions for remote signaling, telemetry, and remote control, which are applied to the feeder automation and load management of smart grids.
Economical and Environmentally Friendly Concept
● Uses vacuum arc quenching and environmentally friendly gas (dry air) insulation, oil-free and SF6-free;
● Low loss and low operating costs make capital investment more reasonable;
● Uses reusable and/or recyclable materials, implementing a streamlined and efficient component design concept;
● Under normal operating conditions, a leakage rate of ≤0.01% per year guarantees a service life of more than 30 years;
Safe to Use
● Logical mechanical and electrical interlocks;
● Strict and effective enclosure grounding ensures zero potential at the contact interface;
● Sealed compartment design effectively prevents accidental entry into live compartments;
● Capacitive voltage indicator system provides effective live safety indication;
● The grounding of the main circuit is completed by a safer vacuum arc quenching system, making grounding operations more efficient and reliable.
Easy to Use
● Cable connections and user interface are located at the front of the cabinet for easy operation and maintenance;
● Large cable installation space facilitates installation;
● A dedicated low-voltage instrument room can be provided upon customer request;
● The operation panel is clear, simple, and easy to understand.
Modular Design, Flexible Configuration
● Multiple units can be housed in the same cabinet, or a separate cabinet design can be adopted. Various modules can be freely combined to meet the needs of different customers;
● Unit modules can be flexibly expanded on site, easily constructing various medium-voltage substations with different requirements;
● Based on load switch units and circuit breaker units, coupled with other auxiliary cabinets, it can meet the applications of different customized schemes.
All-Weather, Strong Environmental Adaptability
● The gas compartment is made of stainless steel plates, unaffected by salt water, moisture, dirt, or temperature, and can maintain its appearance for a long time;
● The main enclosure has an IP67 protection level, and is equipped with prefabricated shielded touch-type cable accessories, meeting the requirements for long-term operation underwater or in other harsh conditions.
Operational Safety
● Designed in strict accordance with GB and DL certification standards;
● Tested and certified according to GB3906 internal arc requirements;
● Warranty meets ISO9001 requirements;
● All high-voltage live parts are completely sealed in the main enclosure, with no accessible live parts.
- Technical Parameters
Item | Unit | Parameter Value |
|---|---|---|
Rated Voltage | kV | 12 |
Lightning Impulse Voltage | kV | 75/85 |
Power Frequency Withstand Voltage | kV/1min | 42/48 |
Power Frequency | Hz | 50 |
Internal Arc Classification (IAC) |
| AFLR 2V1 |
Protection Level | Gas Compartment | IP67 |
Entire Cabinet | IP4X | |
Environmentally Friendly Gas (Dry Air) |
| Moisture Content ≤150μL/L |
Rated Gas Pressure (20℃ Gauge Pressure) | Mpa | 0.02 |
Minimum Operating Pressure (20℃ Gauge Pressure) | Mpa | 0 |
Annual Leakage Rate |
| ≤0.01% |
Operating Ambient Temperature | ℃ | -40~+55 |
Busbar System |
|
|
Rated Current | A | 630 |
Short-time withstand current | kA/s | 25/4 |
Peak withstand current | kA | 63 |
Circuit Breaker |
|
|
Rated Current | A | 630 |
Rated breaking current | kA | 25 |
Rated making current | kA | 63 |
Breaking cable charging current | A | 40 |
Main switch mechanical life |
| M2 10000 times |
Three-position knife switch mechanical life |
| M1 3000 times |
Main switch electrical life |
| E2 30 times |
Short-time withstand current | kA/s | 25/4 |
Switch operation sequence |
| O-0.3s-CO-180s-CO |
Number of times the grounding switch is closed |
| E2 5 times (relying on vacuum arc extinguishing chamber) |
- Outdoor ring network box/switch station application scheme
Ring network box characteristics
The DLNH series ring network box is designed and developed by Dingli Company, and is composed of an environmentally friendly gas-insulated ring network cabinet and an outdoor box shell (GRC/SMC/stainless steel shell is optional).
● The shell material uses stainless steel with a thickness of no less than 2mm, and the outer surface is powder-coated to achieve high corrosion resistance; the parts are all sheet metal parts, connected by welding/welding gas box mechanism room riveting/bolting, etc., to ensure structural stability and light weight, and beautiful appearance;
● The top cover of the shell adopts a water-proof structure design with ventilation function (drainage angle is greater than 3°). The ventilation inlet is arranged on the side of the shell with a removable dust filter, and the outlet is hidden under the eaves. The air convection from bottom to top makes the cable room door box have good heat dissipation and ventilation effect;
● The box has a sealed bottom plate with cable entry and exit ports, effectively preventing moisture in the cable trench from entering the box;
● According to different requirements, the shell can be designed with a front-opening or four-sided opening structure; the door is sealed with a sealing strip, and there is a limit hook when the door is opened, which is convenient for fixing the door; the ring network cabinet installed in the shell adopts maintenance-free design, which can adapt to harsh outdoor environments;
● The outdoor ring network box can be equipped with automated complete sets of equipment (RTU\DTU\FTU, etc.) to realize the three-remote functions of power distribution equipment, upload of power grid data, etc., to meet the requirements of the State Grid for the secondary integration ring network box.
● The size and color of the outdoor box shell will be determined according to the project requirements, and specific details can be contacted in advance; main performance parameters of outdoor ring network box:
● Protection level: IP43 (IP54 optional)
● Mechanical impact level: IK08
● Internal arc level IAC: AFLR 25KA 1s
Previous:
Online Message
If you are interested in our products, please leave your email and we will contact you as soon as possible. Thank you!
Recommend Products
The main products of Dingli Electric are five series: environment-friendly ring network cabinet, environment-friendly high-voltage metering cabinet, deep fusion column switch, European box transformer, Siemens authorized NXAirsLP medium-voltage cabinet and SIVACON 8PT low-voltage cabinet, Eaton authorized RVAC series ring network cabinet, etc.
