HXGN17-12 Metal-Enclosed Ring Main Unit

In many small 10kV ring network distribution scenarios, the reliability of equipment is extremely demanding. However, the performance of ordinary HXGN ring network cabinets is insufficient and their operational stability is poor, making it difficult to meet the power supply requirements of such scenarios. In some cases, ring network cabinets need to be installed in box-type substations. Ordinary ring network cabinets are too large in size and have poor adaptability, making it impossible to be flexibly deployed. HXGN17-12 Metal-Enclosed Ring Main Unit precisely addresses this pain point. Based on the ordinary HXGN, it has been comprehensively upgraded, taking into account reliability, compactness and adaptability, and has become an exclusive upgraded solution for high-end small 10kV ring network distribution.

Three Major Upgrades

The HXGN17-12 Metal-Enclosed Ring Main Unit is an upgraded version of the ordinary HXGN. Each advantage is optimized to meet the core requirements of small ring network power distribution.

Improved structure, more stable and reliable operation: Adopting an improved box structure, compared to the ordinary HXGN ring network cabinet, the structural design is more reasonable, the internal component layout is optimized, reducing operational risks, the failure rate is significantly reduced, no frequent maintenance is required, perfectly adapting to the high-reliability requirements of small 10kV ring network scenarios, capable of long-term stable operation and ensuring continuous power supply.

SF6 load switch, superior arc extinguishing performance: Equipped with a mature SF6 load switch, using SF6 gas as the insulation and arc extinguishing medium, the arc extinguishing capability far exceeds that of ordinary vacuum switches, with fast breaking speed, small arc energy, slight contact erosion, more reliable operation, better meeting the actual needs of small 10kV ring network distribution, and also having the characteristic of long-term maintenance-free, reducing the later operation and maintenance costs.

Five-prevention interlock protection, safer operation: Equipped with a dedicated five-prevention interlock device, strictly following the "five-prevention" safety requirements, completely preventing misoperations such as load operation, accidental contact with live parts, etc., not only ensuring the personal safety of maintenance personnel, but also avoiding equipment failures and power outages caused by misoperations, comprehensively building a 10kV high-voltage operation safety barrier.

Technical Specifications

Application scenarios cover various high-end small-scale 10kV ring network power distribution systems.

With high reliability, compact size and wide adaptability, the HXGN17-12 Metal-Enclosed Ring Main Unit is widely used in various small-scale 10kV ring network power distribution scenarios with high reliability requirements. It can also be flexibly installed in box-type substations and has extremely strong adaptability. In residential area power distribution scenarios, it is suitable for 10kV ring network power distribution in residential areas with high reliability requirements, ensuring stable electricity supply for residents. In small factory scenarios, it is suitable for 10kV ring network power distribution in small factories, meeting the stable power supply requirements for production. In small substation scenarios, it is suitable for 10kV ring network power distribution of small 10kV substations, with stable operation and convenient maintenance. In small infrastructure project scenarios, it is suitable for 10kV ring network power distribution of small infrastructure projects, being durable, reliable and highly adaptable.

Quality Assurance

Junray Electrical, as a professional Manufacturer, Supplier and Factory in China, strictly follows the national standard of HXGN17-12 Ring Main Unit. Each HXGN17-12 Metal-Enclosed Ring Main Unit undergoes rigorous structural testing, withstand voltage test and interlock test to ensure stable and safe operation and guarantee quality. We offer unit customization and function customization. Based on the customer's small 10kV ring network distribution plan, we can tailor an exclusive cabinet to perfectly meet the actual needs. Whether it is for project bidding or engineering acceptance, it can be successfully passed. The process is mature and durable, making procurement more convenient and use more reassuring.

Project Overview

This project involves the 10kV power distribution system upgrade and renovation for a cluster of small and medium-sized enterprises (SMEs) within an industrial park. The park comprises multiple standard factory buildings, R&D workshops, and associated utility loads; the electrical load is dispersed across numerous branch circuits, necessitating a multi-segment ring-network power supply configuration. The existing aging switchgear suffered from insulation degradation, rudimentary structural design, a lack of reliable "five-prevention" interlocking mechanisms, and an inability to facilitate flexible ring-network interconnection. These issues resulted in extensive power outages during maintenance and low supply reliability, severely impacting the enterprises' normal production operations.

The project entails replacing all high-voltage distribution switchgear with HXGN17-12 indoor metal-enclosed ring main units (RMUs). These units will handle 10kV incoming lines, sectional interconnection, load branching, and terminal supply for box-type substations. This setup establishes a reliable distribution network structure featuring multiple segments and interconnections, thereby meeting the park's requirements for capacity expansion, maintenance isolation, and non-stop power transfer.

Issues Prior to Renovation

Significant safety hazards associated with aging switchgear: Older fixed-type cabinets lacked comprehensive "five-prevention" interlocking, making them prone to operational errors; insulation degradation and dust accumulation led to tracking and flashovers, causing trips during thunderstorms.

Inability to provide flexible ring-network power supply: Existing equipment lacked reliable interconnection and sectionalizing capabilities; faults necessitated a total line shutdown, resulting in substantial production losses for the park's enterprises.

Difficulty in circuit expansion: The fixed structure of the old cabinets prevented the addition of new branch circuits, failing to meet the increased power demands of new enterprises entering the park.

Cumbersome maintenance and operations: The lack of independent functional compartments meant that maintenance required large-scale power outages, resulting in high operational risks and low emergency repair efficiency.

Low protection rating: Given the complex environment and high dust levels surrounding the factory buildings, the standard cabinets offered poor dust and moisture resistance, leading to a high equipment failure rate.

Equipment Configuration Plan

To address the distribution characteristics of the industrial park—specifically the need for multiple branches, ring-network interconnection, and frequent capacity expansion—the project adopts HXGN17-12 box-type metal-enclosed ring main units (RMUs) for the medium-voltage distribution system. These units utilize a vacuum load-break switch design, providing reliable ring-network, sectionalizing, and terminal protection functions. Key Equipment Specifications

Model: HXGN17-12 Indoor Medium-Voltage Metal-Enclosed Ring Main Unit (RMU)

Rated Voltage: 12kV (suitable for 10kV distribution networks)

Rated Current: 630A

Breaking Element: Vacuum load switch combined with current-limiting fuse protection

Cabinet Structure: Metal-enclosed; independent busbar and cable compartments; built-in pressure relief channel

Protection Class: IP4X (dust-proof and moisture-resistant; suitable for complex industrial environments)

Safety Features: Comprehensive "Five-Prevention" mechanical/electrical interlocks, live-line indication, fault indication, and grounding interlocks

Operating Modes: Supports ring network interconnection, sectionalized power supply, terminal distribution, and dual-power backup

Construction and Application Highlights

Strong Ring Network Capability & Flexible Power Supply: Allows for flexible configuration of multi-section "daisy-chain" (hand-in-hand) networks; faults in a single section can be isolated and power rerouted, significantly minimizing the scope of power outages.

Stable Vacuum Arc-Extinguishing Performance: Utilizes vacuum load switches offering strong arc-extinguishing capabilities, non-combustibility, and maintenance-free operation; eliminates the gas leakage risks associated with SF6 switchgear, ensuring environmental safety.

Durable Structure Suited for Industrial Environments: Fully enclosed metal cabinet with high protection ratings; effectively withstands factory dust and fluctuations in temperature and humidity, ensuring long-term insulation stability.

Convenient Capacity Expansion: Cabinets can be flexibly joined side-by-side; future load increases within the industrial park can be accommodated through direct expansion without requiring a complete system overhaul.

Comprehensive "Five-Prevention" Safety Interlocks: Completely eliminates critical electrical accidents such as switching under load, opening doors while live, or accidental grounding, ensuring high safety during operation and maintenance.

Operational Performance

Significantly Improved Power Supply Reliability: Enables sectional isolation and fault rerouting; maintenance or faults no longer require a total line shutdown, ensuring continuous production for enterprises within the park.

Stable, Zero-Fault Operation: Vacuum arc-extinguishing combined with a fully sealed structure prevents creepage, flashover, and moisture-related failures, resulting in zero abnormal trips throughout the year.

Precise and Reliable Fault Clearing: Combined fuse and load switch protection ensures rapid clearing of short-circuit faults in transformers and branch lines, safeguarding downstream equipment.

Safe and Convenient O&M: Features comprehensive "Five-Prevention" functions and a clear structural layout; fault locations are easily identified, significantly boosting maintenance efficiency and drastically reducing operational risks. Meets long-term capacity expansion needs: The cabinet features an expandable structure that accommodates future business attraction and load growth within the industrial park, with ample capacity reserved for power distribution.

Case Summary

The HXGN17-12 is a vacuum-type ring main unit (RMU) designed specifically for industrial parks, industrial clusters, factory power distribution rooms, and urban distribution network upgrades. Unlike the XGN15-12 (which uses SF6 gas insulation), this model employs vacuum arc extinguishing, eliminates gas leakage risks, and is environmentally friendly and maintenance-free. Compared to KYN28-series metal-clad switchgear, it offers lower costs, a smaller footprint, and superior adaptability for ring network configurations, making it the optimal, cost-effective choice for high-reliability ring network distribution systems requiring multiple circuits and sectionalizing capabilities in industrial zones.