Product Description

For environments where even a minor gas leak presents extreme safety hazards-such as deep underground mines, subway tunnels, or chemical refineries-gas-insulated systems are not a viable option. Our cutting-edge Solid Insulated Ring Main Unit (Solid RMU) utilizes advanced epoxy resin vacuum casting technology to fully encapsulate all primary live components and switches. This completely dry, solid-insulated design eliminates the need for both SF6 and eco-gases, making our Solid Insulated Ring Main Unit (Solid RMU) an incredibly safe, reliable, and environmentally benign choice for high-risk and ultra-clean environments.

Because it is completely solid-insulated, our Solid Insulated Ring Main Unit (Solid RMU) is entirely immune to gas pressure drops, internal arc explosions, and dust or moisture intrusion. The highly flexible, modular block structure allows engineers to easily combine different functional circuits onsite, reducing system downtime during expansion. With over 15 years of solid insulation engineering experience, our factory guarantees that every RMU delivers superior mechanical endurance and exceptionally low maintenance costs throughout its entire service life.

Specifications

Rated Voltage	12 kV
Rated Current	630 A / 1250 A
Rated Frequency	50Hz / 60Hz
Solid Insulation Material	High-grade, vacuum-cast epoxy resin (completely solid, gas-free)
Short-Time Withstand Current	20 kA / 25 kA for 4 seconds
Partial Discharge Level	≤ 10 pC (at 1.2 Un, ensuring outstanding insulation quality)

Applications

Metro & Subway Networks: Underground traction power distribution requiring absolute safety and zero toxic gas emissions.

Underground Mining Operations: Extremely rugged, explosion-proof, and dust-resistant switchgear for deep mining shafts.

Chemical & Petrochemical Refineries: Safe power distribution in environments containing highly corrosive or volatile gases.

Water Treatment & Pumping Facilities: Reliable power nodes that guarantee zero risk of contaminating nearby water supplies.

Customization & Factory Strength

We possess an advanced vacuum pressure gelation (APG) casting facility and a dedicated solid insulation engineering team. We offer comprehensive customization for our Solid Insulated Ring Main Unit (Solid RMU), including modular circuit reconfiguration, custom current/voltage sensor integrations, and tailored cable entry directions. Every cast pole is subjected to strict partial discharge and X-ray testing to guarantee that the epoxy resin is completely free of voids, micro-cracks, or impurities before final switchgear assembly.

Packaging & Shipping

Packaging: Securely wrapped in thick anti-static film with heavy-duty desiccants, vacuum-sealed inside a moisture-barrier bag, and housed in reinforced, steel-framed seaworthy wooden crates.

Shipping: Placed on heavy-duty iron-skid bases and secured with high-tensile steel strapping to ensure safe handling by standard forklifts and cranes during global transport.

FAQ

Q1: What are the primary safety advantages of a solid insulated RMU over gas-insulated alternatives?

A1: Our Solid Insulated Ring Main Unit (Solid RMU) completely eliminates the risk of SF6 gas leakage or pressure drops, which can cause dielectric breakdown and catastrophic failure in gas-insulated units. Furthermore, because all live components are fully encapsulated in solid epoxy resin, there is absolutely no possibility of internal phase-to-phase short circuits, dust accumulation, or moisture-induced tracking, offering the highest level of operational safety.

Q2: How does the solid insulated RMU handle thermal expansion in extreme climates?

A2: We use high-grade epoxy resin formulated with a thermal expansion coefficient closely matched to the internal copper/aluminum conductors. This prevents internal mechanical stress, cracking, or delamination during temperature fluctuations. Our solid cast poles are fully tested and certified to operate reliably in extreme climates ranging from -40°C to +55°C.