Shenheng Power Equipment Co., Ltd.
Unité de puissance en anneau (RMU) – Appareillage de commutation moyenne tension isolé au gaz SF6
The Ring Main Unit (RMU), also widely known as the SF6 gas insulated cabinet, is a professional medium-voltage high-performance electrical switchgear. It adopts high-purity SF6 sulfur hexafluoride gas as the core insulating and arc-extinguishing medium, replacing traditional air insulation structures. Featuring miniaturized size, fully enclosed protection, maintenance-free operation and ultra-long service life, this MV switchgear delivers stable, safe and efficient power distribution performance. It is widely applicable to urban power grids, industrial power supply, new energy grid connection and other core scenarios, being a mainstream reliable solution for modern medium-voltage power distribution systems.
Product Overview
The SF6 gas insulated Ring Main Unit (RMU) is a specialized medium and high voltage electrical equipment designed for modern power distribution systems. Different from conventional air-insulated switchgears, it takes inert SF6 gas as the exclusive insulating and arc-quenching medium, which can quickly extinguish electric arcs and isolate circuits safely. This core technical design fundamentally optimizes the structural performance and operational stability of the equipment, enabling the RMU switchgear to adapt to diverse complex power distribution environments and meet the high-standard power supply demands of various industries.
Avantages Clés du Produit
1.Ultra-Miniaturized Structure, Space-Saving
Benefiting from the excellent high-insulation performance of SF6 gas, the overall volume of the RMU gas cabinet is reduced by more than 50% compared with traditional air-insulated distribution cabinets. The compact and integrated structural design greatly saves installation space, making it perfectly suitable for scenarios with strict space limitations.
2.All-Weather Operational Reliability
The equipment adopts a fully sealed enclosed structure, which completely isolates internal core components from the external environment. It is not affected by harsh factors such as high humidity, dust pollution, corrosive dirt and high altitude, ensuring consistent and stable operating performance in various complex working conditions.
3.Completely Maintenance-Free Operation
SF6 gas boasts extremely high chemical stability and inert characteristics. The internal conductive contacts and core components work in a stable inert gas environment, with almost no oxidation, wear or aging. It effectively eliminates the need for frequent daily maintenance and component replacement, greatly reducing later operational costs.
4.30+ Years Ultra-Long Service Life
With mature structural design, high-quality raw materials and stable gas insulation system, the RMU switchgear achieves a design service life of more than 30 years. It supports long-term continuous and stable operation, providing durable power distribution guarantee for projects.
5.High Safety & Low Noise Operation
The product features flame-retardant and fire-proof performance with zero fire risk during operation. Meanwhile, the optimized internal structural design effectively reduces operating noise, realizing safe, silent and environmentally friendly equipment operation.
Larges scénarios d'application
Power Substations: Ideal for incoming lines, outgoing lines and bus connection circuits of medium and high voltage power distribution systems, ensuring stable power transmission and circuit protection for grid substations.
Industrial Power Supply: Adaptable to harsh industrial environments including mining, metallurgy, chemical engineering and other high-corrosion, high-dust working scenarios, meeting high-reliability industrial power consumption demands.
Urban Power Grid Construction: Perfect for space-limited key urban facilities such as subways, airports and large-scale data centers, supporting precise and efficient urban power distribution.
Renewable Energy Projects: Applicable to voltage boosting and grid connection links of photovoltaic power stations and wind farms, adapting to fluctuating new energy power generation loads and realizing stable grid integration.
| No. | Item | Unit | Technical Parameter |
|
| 1 | Rated voltage | KV | 12 | |
| 2 | Rated current | A | 1250 | |
| 3 | Rated short-time power frequency withstand voltage (effective value) | KV | 42 | |
| 4 | Rated lightning impulse withstand voltage (peak value) | KV | 75 | |
| 5 | Rated short-circuit breaking current (effective value) | KA | 31.5 | |
| 6 | Rated short-circuit making current (peak value) | KA | 80 | |
| 7 | Rated thermal stability current(effective value) |
Main circuit (4S) | KA | 31.5 |
| Ground loop (4S) | KA | 27.3 | ||
| 8 | Rated dynamic stabilitycurrent (peak value) |
Circuit principal | KA | 80 |
| Ground loop | KA | 68.3 | ||
Customization & Standardization Advantages
To meet diverse project demands, our RMU SF6 gas cabinet supports free selection of international famous brand components including ABB and Siemens. We provide full-coverage ODM and OEM customized services, and the entire product series strictly complies with the international standard IEC 62271-200, ensuring universal compatibility and authoritative quality certification for global projects.
Intelligent Production Strength
We are equipped with more than 220 sets of advanced intelligent production equipment, building a fully automated production cluster. The production line supports 72-hour unattended continuous operation, with a capacity utilization rate of over 95%. The intelligent manufacturing mode effectively improves production efficiency and product consistency, shortening the overall order delivery cycle by 30% and realizing fast and high-quality order delivery.
Strict Quality Control System
All equipment will undergo a full set of professional project tests and 72-hour continuous operation inspection before factory delivery. We strictly verify the operational stability of the equipment in extreme environments to eliminate potential quality risks. Backed by reliable quality performance, we provide an ultra-long 30-year quality protection commitment for all products.
Global Full-Cycle Service
We provide 24/7 global customer response service, quickly responding to technical consultation, after-sales support and project customization needs of customers worldwide. Meanwhile, we provide customized full life cycle maintenance solutions, which can effectively extend the overall service life of equipment by 30%, creating long-term value for customers’ projects.
Portée et entrées de sélection de l'ingénierie
An RMU should be evaluated from the cable network layout, required switching and protection functions, installation environment, and operating procedure. Confirm the exact module arrangement and gas-handling obligations for the project location.
Informations à inclure dans une demande de devis (RFQ)
- Ring or radial network arrangement and incoming/outgoing feeder functions
- Load-switch or breaker duties, protection scheme, CT/VT, and metering
- Cable interface, enclosure, installation environment, and access requirements
- Factory tests, operating instructions, and applicable gas-handling requirements
Ajuster le contour
Do not treat SF6 construction as a universal default; local environmental rules, service capability, maintenance procedure, and the project specification must be reviewed.
Lecture d'ingénierie connexe
Guide de sélection des tableaux modulaires · SF6 RMU Outdoor Installation Guide
Pour une revue d'ingénierie, contacter Shenheng Power avec le schéma unifilaire approuvé, les conditions du site, les normes requises et les exigences de livraison.
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