24KV Solid Insulated Ring Main Unit

Sarah Electric is a Chinese manufacturer of 24KV Solid Insulated Ring Main Units. Utilizing solid insulation technology, this product enables safe switching control and reliable power supply for 24kV power grids, facilitating the connection, distribution, control, and protection of electrical energy.

Product Structure and Design

1. Vacuum Interrupter: Responsible for making and breaking the current; the arc-extinguishing medium is a vacuum, ensuring the arc is extinguished within the vacuum without the risk of sustained arcing.

2. Epoxy Resin Solid Encapsulation: Components such as the vacuum interrupter, disconnector, earthing switch, and conductive connectors are placed into a mold and cast as a single unit using epoxy resin via the APG (Automatic Pressure Gelation) process, forming a fully sealed, solid-insulated module.

3. Modular Design: Each functional unit of the 24kV Solid Insulated Ring Main Unit (RMU) is an independent module that can be flexibly assembled and combined to create various wiring configurations.

4. Shielding and Earthing: The outer surface of the module is coated with a conductive or semi-conductive shielding layer, ensuring that the potential of accessible parts remains at zero to guarantee personal safety.

5. Visible Break: The product can be customized with an observation window, allowing for direct visual inspection of the disconnector's contact status to ensure safety during maintenance.

Key Advantages

1. Environmentally Friendly

The 24kV Solid-Insulated Ring Main Unit (RMU) complies with global and EU environmental regulations regarding "dual-carbon" goals and restrictions on high-SF6 gas usage. It features zero greenhouse gas emissions, requires no subsequent exhaust gas treatment, and entails minimal recycling costs.

2. High Safety

The solid insulation material offers stable performance, eliminating risks associated with gas leakage or insufficient gas pressure.

Furthermore, the unit utilizes vacuum arc extinguishing combined with solid encapsulation and an earthed external conductive shielding layer, preventing explosions caused by excessive gas pressure.

3. Strong Environmental Adaptability

The equipment's protection rating is customizable, capable of reaching IP67 standards.

The solid-encapsulated poles withstand extreme environments, including high salt spray, high humidity and heat, high altitudes, condensation, and heavy dust.

4. Compact Structure

Compared to traditional air-insulated switchgear, the volume is reduced by 60–70%. Additionally, unique solid plug-in connectors facilitate rapid on-site unit expansion without the need for gas-related operations.

Technical Specifications

24KV Solid Insulated Ring Main Unit vs. SF₆ Ring Main Unit: Key Differences

The 24kV solid-insulated ring main unit (RMU) is an eco-friendly alternative to traditional SF₆-insulated RMUs. Centered on epoxy resin solid-encapsulation technology, it achieves three major breakthroughs: zero SF₆ emissions, a fully sealed and maintenance-free design, and exceptional environmental adaptability.

In What Scenarios Can the 24kv Solid Insulated Ring Main Unit Be Used?

● High-standard environmental protection and green energy projects: Wind farms, centralized photovoltaic power plants, green low-carbon industrial parks, and enterprises meeting ESG standards.

● Projects in harsh environments: Coastal areas with high salinity and heavy pollution, high-altitude regions, flood-prone underground basements or sunken substations, and humid wetland parks.

● High-safety public facilities: High-speed railway stations, airport terminals, metro/rail transit systems, large-scale data centers, hospitals, and high-rise buildings.

● Smart upgrades for urban power grids: Ring-network power supply for major urban roads and pilot nodes for smart distribution network automation.

FAQ

Q: Can this RMU be configured with a vacuum circuit breaker?

A: Yes. Depending on project requirements, it can be configured with a load break switch, a vacuum circuit breaker, or a fuse-switch combination.

Q: How many incoming and outgoing circuits does the 24kV solid-insulated RMU support?

A: Unit combinations can be designed to meet specific project needs. Common configurations include 2-in/1-out, 2-in/2-out, 3-unit, and 4-unit RMUs, as well as multi-circuit extension schemes, satisfying requirements for ring network power supply and multi-load distribution.

Q: Can you manufacture products according to IEC standards?

A: Yes. Sarah Electric’s product design and testing can comply with relevant international standards based on project requirements; specific standards can be confirmed according to the target market.