Primary Electrical Distribution & Metering Assemblies
Precision-engineered RMU switchgear, compression-molded SMC enclosures, and advanced metering infrastructure compliant with international standards.
China Stainless Steel Three-Phase Electric Energy Metering Box & Transformer
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Wholesale China TY-SXD2 Single-Phase Electric Energy Metering Box
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Wholesale TY-SXD1-FSH1 Waterproof Box Durable IP44 Protection
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Wholesale Primary and Secondary Fusion Pole Mounted Circuit Breaker
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Wholesale Single-Phase Electric Energy Metering Box TY-SXD2 Series
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China SMC Fiberglass Photovoltaic Grid-Connected Distribution Box
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Stainless Steel Single Phase Twelve-Position Meter Cabinet
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China TY-SXD1-FSH1 Waterproof Meter Protection Enclosure
View DetailsRm6 Ring Main Unit Architecture & Global Procurement Trends
Strategic engineering overview of SF6-gas insulated and solid-insulated switchgear deployments across high-density urban grids and renewable hubs.
The Rm6 Ring Main Unit (RMU) is a critical cornerstone within modern medium-voltage (MV) secondary distribution networks. Engineered specifically for secondary substations, wind power farms, photovoltaic installations, and compact industrial distribution hubs, the Rm6 architecture represents an optimal compromise between compact dimensions, total internal arc safety, and high operational continuity. Manufactured in Yueqing, China—the world renowned hub of power electrical equipment—our factory delivers gas-insulated switchgear (GIS) configured for 12kV, 17.5kV, and 24kV rings, engineered strictly according to IEC 62271-200, IEC 62271-100, and IEC 62271-102 standards.
In contemporary grid engineering, procurement engineers and EPC contractors face escalating challenges: urban land costs force substations into extremely confined footprints; severe coastal environments introduce high humidity and salinity; and distributed renewable generation introduces severe intermittent bidirectional power swings. The Rm6 gas-insulated compact switchgear solves these challenges by sealing all live primary switching parts—including disconnectors, vacuum or SF6 circuit breakers, and busbar assemblies—inside a robotically welded stainless steel enclosure filled with insulating gas at a mild overpressure. This design completely insulates internal active contacts from dust, humidity, chemical pollutants, small fauna, and water submersion, providing a true 30-year maintenance-free lifecycle.
| Technical Parameters | 12 kV System Configuration | 24 kV System Configuration | Standards Compliance |
|---|---|---|---|
| Rated Operational Voltage (Ur) | 12 kV | 24 kV | IEC 62271-1 |
| Power Frequency Withstand (Ud 1min) | 28 kV / 42 kV across disconnector | 50 kV / 60 kV across disconnector | IEC 62271-200 |
| Lightning Impulse Withstand (Up peak) | 75 kV / 85 kV across disconnector | 125 kV / 145 kV across disconnector | IEC 62271-102 |
| Rated Main Busbar Current (Ir) | 630 A | 630 A | IEC 62271-200 |
| Short-time Withstand Current (Ik 3s) | 20 kA / 21 kA (3 seconds) | 16 kA / 20 kA (3 seconds) | IEC 62271-200 |
| Internal Arc Classification (IAC) | IAC AFLR 20 kA 1s | IAC AFLR 16 kA / 20 kA 1s | IEC 62271-200 Annex A |
| Sealed Stainless Tank Ingress Rating | IP67 (Hermetically sealed tank) | IP67 (Hermetically sealed tank) | IEC 60529 |
Engineered Across Mission-Critical Power Systems
Tailored medium-voltage ring solutions designed to withstand operational extremes and guarantee uninterrupted energy flow.
Solar & Wind Farm Interconnections
Utility-scale renewable plants operate under intense solar radiation, temperature cycling, and remote conditions. Our Rm6 switchboards integrate circuit-breaker modules with sensitive directional protection relays, allowing rapid disconnection of transformer faults without taking adjacent solar strings or wind turbine arrays offline.
- Integrated zero-sequence current detection
- Plug-in surge arrester cable bushings
- IP67 hermetic tank for sand/dust exclusion
Urban Compact Package Substations
Metropolitan power authorities demand ultra-compact dimensions to fit switchgear directly into prefabricated kiosk substations, basement utility rooms, and street distribution kiosks. The modular Rm6 design provides extensible configurations (NE-IDI, NE-QIQI, DE-BC) with minimum footprint requirements.
- Front-accessible operation and interlocking
- Integrated bottom/top cable termination rooms
- Internal Arc Classification (IAC AFLR) safety
Heavy Industrial & Petrochemical Complexes
Refineries, chemical processing plants, and mining sectors experience highly corrosive atmospheres containing sulfur dioxide, chlorides, and particulate matters. Our laser-welded 304/316L stainless steel gas vessel guarantees absolute corrosion resistance, preventing contact degradation and flashover.
- Complete chemical and gas atmosphere seal
- High short-circuit withstand capacity (up to 25kA)
- Reliable mechanical interlocks for technician safety
Technology Roadmap: Eco-Friendly Gases & Grid Digitalization
Pioneering sustainable SF6-free insulation and intelligent IoT integration for autonomous smart distribution networks.
SF6-Free Eco-Gas Solutions
As carbon regulations tighten globally (such as the EU F-gas Regulation), Teyi Electric has formulated an engineering transition pathway. Our next-generation switchgear utilizes clean dry air (synthetic air) and vacuum interruption technology, achieving zero Global Warming Potential (GWP=0) with zero compromise on dielectric isolation.
Smart Primary-Secondary Fusion
Integrating intelligent feeder terminal units (FTU) and distribution automation controllers directly into the Rm6 mechanism chamber. Our units support IEC 61850 protocol, Modbus RTU, and DNP3, providing centralized control centers with live voltage, current, partial discharge (PD), and tank pressure data for predictive maintenance.
Solid Insulation (SIS) Hybrid Systems
For applications where gas handling is discouraged or subterranean tunnels have strict environmental constraints, our solid-insulated ring main units cast phase conductors and vacuum interrupters within epoxy resin, eliminating gas leakage risks entirely and enabling compact vertical stackability.
Worldwide Compliance & Factory Assurance Standards
How our Yueqing manufacturing hub guarantees traceability, dimensional precision, and routine inspection for overseas utility tenders.
100% Routine Factory Testing
Every single Rm6 unit produced leaves our production line only after completing exhaustive automated routine tests: Helium mass-spectrometry leak detection (ensuring leakage rate <0.1% per annum), main circuit resistance measurement, power frequency withstand voltage testing, and mechanical endurance operation testing.
Export Seaworthy Packaging
Overland and maritime transportation subjects sensitive electrical mechanisms to dynamic shocks and salt air. Our products are packaged with vapor-corrosion inhibitors, vacuum-sealed barrier foils, desiccants, and reinforced fumigated timber crates compliant with ISPM 15, preventing mechanical misalignment during transit.
Dedicated Engineering Support
We supply full secondary schematic verification, single-line diagrams (SLD), 3D BIM/CAD step models, and bilingual installation manuals for local utility approvals. Factory Acceptance Testing (FAT) can be witnessed physically at our Yueqing facility or verified via high-definition live streaming.
Frequently Asked Technical & Commercial Questions
Key insights to address technical inquiries, tender qualifications, and operational specifications.
What is the standard functional module combination for Rm6 switchgear?
The Rm6 range supports flexible configurations including "I" (Load Break Switch module, 630A), "Q" (Switch-Fuse Combination module for transformer protection, 200A), "D" (Direct Cable connection module), and "B" (Vacuum or SF6 Circuit Breaker module, 630A). Common combinations include compact non-extensible 3-way or 4-way units (e.g., CCF, CCC, CBF) or extensible busbar systems (NE/DE series) for modular grid expansions.
How is gas leakage prevented over the 30-year operational lifetime?
The gas tank is constructed from high-grade 304 or 316L stainless steel, automatedly laser-welded with zero penetrations across static joints. Rotating shafts pass through specialized dual-stage dynamic O-ring seals with specialized fluorosilicone elastomers. Every finished tank undergoes high-vacuum helium mass-spectrometry leak detection, maintaining a leakage rate below 0.1% per year in accordance with IEC "Sealed Pressure System" classification.
Can China-manufactured Rm6 units directly substitute European OEM models?
Yes. Our Rm6 switchboards align strictly with standard dimensions, busbar centerlines, front-panel operating interlocks, cable compartment depths, and bushing heights (standard Type C 630A or Type A 200A interface compliant with EN 50181). This allows seamless retrofitting or drop-in replacement in existing kiosk enclosures and civil substations.
What motorization and SCADA automation options are available?
Units can be equipped with 24V DC, 48V DC, 110V DC, or 220V AC motorized operating mechanisms, auxiliary limit switches, and trip coils. We integrate auxiliary power transformers (PT), split-core current transformers (CT), and communication-ready Feeder Terminal Units (FTUs) supporting DNP3, IEC 60870-5-104, and IEC 61850 for immediate SCADA commissioning.
Specialized Metering & Distribution Terminal Products
Explore our full line of low-voltage and medium-voltage power distribution boxes, fusion terminal cabinets, and multi-user meter boards.
China TY-SXS2-DXJ Low Voltage Three-Phase Metering Box
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Three-Phase Electric Energy Metering Box (Transformer Type)
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Wholesale Single-Phase Metering Box TY-SXD2 Series Reliable Unit
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China TY-SXD1-FX Single-Phase One-Position Distribution Box
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China TY-SXD2+SXS2-1B Combined Metering Distribution Box
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Wholesale China Ring Main Unit (RMU) Medium-Voltage System
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China TY-TTU Intelligent Fusion Terminal Distribution Box
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