Overview
Operating as a fully hermetically sealed unit, this system provides an uncompromising shield for internal primary components
against aggressive environmental contaminants such as particulate dust, high humidity, and chemical oxidation. Serving as a
mission-critical node within the grid, the 35kV high voltage switchgear delivers superior arc-quenching protection and high-
precision switching capabilities across diverse load conditions. By leveraging advanced SF6 GIS technology for dielectric
insulation, the architecture ensures absolute internal stability and sustained electrical integrity. This robust design facilitates
seamless network integration and optimized energy management, maintaining peak efficiency whether utilized as a high voltage
RMU or a primary distribution assembly. The result is a highly reliable infrastructure asset that significantly extends service intervals
and ensures uninterrupted power continuity for complex modern electrical systems.
Core Components and Features
The foundation of the system lies in its modular high voltage architecture, which allows for flexible, site-specific configurations.
Within the 35kV RMU, primary circuit-breaking elements are housed in a high-grade stainless steel tank filled with pressurized gas.
The design includes vacuum interrupters that provide excellent quenching performance during switching operations. Inside the
enclosure, an integrated busbar system facilitates efficient power flow between functional modules. To support smart grid demands,
the unit features precision transformers that feed real-time data to digital protection relays, while mechanical interlocks prevent
operational errors.
Design and Compliance
Design:
Utilizing high-precision laser-welded enclosures, the system maintains optimal gas pressure and dielectric density. This rigorous
sealing process ensures that the core switching components remain entirely maintenance-free, significantly reducing the total
cost of ownership. Beyond durability, the unit is engineered and rigorously tested to withstand catastrophic internal arc faults,
prioritizing the safety of operational personnel and adjacent equipment. Its sophisticated modular high voltage layout grants
engineers the essential flexibility to scale and reconfigure the installation seamlessly as regional power demands evolve.
Compliance:
Absolute compliance with global regulatory frameworks is a cornerstone of the manufacturing process. This equipment strictly
adheres to IEC 62271-200 standards for metal-enclosed systems, passing comprehensive type tests for dielectric strength and
thermal stability. By meeting diverse regional grid codes, the 35kV gas insulated RMU is perfectly positioned for global export
and deployment in complex international projects. Furthermore, the design incorporates standardized interfaces that facilitate
future digital substation upgrades. This forward-looking compatibility ensures that the hardware can integrate with advanced
communication protocols and smart grid energy management systems, providing a future-proof solution for sustainable power
distribution.
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Key Advantages
Versatile Integration and Architectural Compatibility
The advanced SF6 technology facilitates seamless integration into complex infrastructure. This adaptability makes it the premier
choice for modern urban developments, where the equipment can be effortlessly incorporated into multi-story building basements
or pre-fabricated containerized substations without requiring extensive structural modifications. This flexibility allows planners to
streamline facility layouts while maintaining high power density in diverse architectural environments.
Environmental Resilience
Being fully hermetically sealed, the internal primary components remain completely immune to aggressive atmospheric conditions
such as salt spray, high humidity, and airborne particulates. This robust enclosure ensures the ring main unit functions with
unwavering reliability in harsh coastal regions, arid desert climates, or heavily polluted industrial zones where traditional insulation
might fail.
Low Operational Costs
Since the critical switching parts are shielded from environmental wear and oxidation, the need for routine contact cleaning or
internal lubrication is virtually eliminated. This "sealed-for-life" design drastically reduces the frequency of manual inspections,
thereby lowering the total cost of ownership and optimizing the entire asset lifecycle.
Enhanced Safety
Integrated precision sensors provide real-time, continuous monitoring of gas density and pressure levels to preemptively identify
potential issues. Furthermore, the inclusion of foolproof mechanical interlocks ensures that cable testing and inspection procedures
are performed with maximum security, preventing accidental contact with live components and ensuring total operator protection.
Parameter
Rated voltage |
35kV - 40.5kV |
Insulation Type |
SF6 Gas insulated |
Cabinet Type |
Floor-standing Power Box |
Protection Level |
IP55(customizable) |
Customization |
Available |
Rated Current |
630A to 1250A |
Short-circuit Capacity |
20kA / 25kA (3s) |
Application Scenarios
Modern Urban Distribution Grids
In densely populated metropolitan areas, this architecture is essential for underground power hubs and compact substations. By
allowing utilities to position distribution points closer to high-load centers, such as skyscrapers and commercial complexes, it
drastically reduces transmission losses. The system ensures a stable, high-capacity power supply while helping developers
significantly lower land acquisition and civil engineering costs, making it a cornerstone for smart city electrical infrastructure.
Renewable Energy Integration
This technology is perfectly suited for the rigorous demands of wind farms and large-scale solar parks. Its robust construction allows
it to be housed directly within turbine towers or specialized outdoor kiosks. The hermetically sealed design provides a critical shield
against corrosive salt air in offshore installations and abrasive dust in desert solar arrays, maintaining peak performance and dielectric
integrity for decades without environmental degradation.
Heavy Industrial and Mining Facilities
Industrial environments require a power solution capable of withstanding ambient pollution and volatile loads. This modular high
voltage assembly provides consistent, high-quality power for intensive mining operations and large-scale manufacturing plants.
By isolating sensitive switching components from polluted air and industrial particulates, it minimizes the risk of flashovers and
equipment failure, thereby reducing costly production downtime and ensuring operational continuity.
Transportation and Critical Infrastructure
Large-scale rail and metro projects rely on this technology to provide consistent traction power and station services. It handles the
highly fluctuating loads typical of electrified transit networks with ease. By deploying a durable, automated distribution network,
transport authorities can guarantee the safety and punctuality of services, ensuring that critical infrastructure remains resilient
against the mechanical and electrical stresses of high-frequency transit operations.
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