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SF6RMU-NXRING-24-EN
NXRING is an indoor type metal-enclosed single bus swicth gear that is
insulated with SF6 gas and fully meets type test requirements. It is suitable
for the secondary power distribution system of the public power grid and
the power distribution system in the industrial and other fields.
Its compactness and modular expansion make it an excellent cabinet for
secondary power distribution applications.
- Information
NXRING-24 Gas Insulated Ring Main Unit
Indoor metal-enclosed SF6 gas insulated single busbar switchgear for medium voltage applications up to 24kV. Designed for reliability, safety, and compact installation.
Product Description
NXRING-24 is an indoor type metal-enclosed SF6 gas insulated single busbar switchgear, completely meeting the type test requirements.
1. Product Overview
The NXRING-24 gas insulated ring main unit is designed for medium voltage distribution applications. The strong insulation performance of SF6 gas enables an extremely compact cabinet structure. It can be used in public grid or newly-built distribution rooms, and also in places with special space requirements.
Typical applications include:
Switching station, transformer high voltage incoming line unit
Terminal transformer incoming line unit
Applications with limited space availability
The cabinet meets the type test requirements. The switchgear is equipped with internal arc pressure relief channel, voltage display device, grounding capacity, operating interlock, and optional cable head temperature monitoring device.
2. Design Features
Compact Design
The SF6 gas provides excellent insulation performance, allowing for a very compact cabinet structure. The compact footprint makes it ideal for installations with space constraints.
40% smaller footprint than conventional air-insulated switchgear
Ideal for urban substations with limited space
Modular design for easy expansion
Reduced civil works requirements
Safety Features
Comprehensive safety systems ensure protection for both personnel and equipment under all operating conditions.
Internal arc pressure relief channel
Voltage display device
Grounding capacity and operating interlock
Optional cable head temperature monitoring
Maintenance-Free Operation
Designed for minimal maintenance throughout its service life with sealed gas compartments and durable components.
Maintenance-free fully sealed gas box
Shielded cable terminal
One-time component, maintenance-free
Easy to use throughout service life
3. Standards Compliance
Standards and Certifications
NXRING-24 complies with existing Chinese national standards and IEC standards. The design and manufacturing comply with Chinese national GB standards and relevant International Electrotechnical Commission IEC standards.
International Standards
IEC 62271-200, IEC 62271-1, IEC 60529, IEC 62271-203, IEC 62271-3
National Standards
GB 3906, GB/T 11022, GB/T 16926, GB/T 311.1, GB/T 311.2
Certifications
CE certification, ISO 9001 quality management system, type test certificates from accredited laboratories
Technical Specifications
Detailed technical specifications and performance parameters for NXRING-24 gas insulated ring main unit
1. Electrical Parameters
| Parameter | Load Switch Unit | Combination Unit | Vacuum Circuit Breaker Unit |
|---|---|---|---|
| Rated Voltage (kV) | 24 | 24 | 24 |
| Power Frequency Withstand Voltage (kV) | 50 | 50 | 50 |
| Lightning Impulse Withstand Voltage (kV) | 125 | 125 | 125 |
| Rated Current (A) | 630 | Fuse Rated Current | 630 |
| Breaking Capacity (kA) | 20 | - | 20 |
| Closed-Loop Breaking Current (A) | 630 | - | - |
| Cable Charging Breaking Current (A) | 135 | - | - |
| Earth Fault Breaking Current (A) | 200 | - | - |
| Phase-to-Phase Earth Fault Breaking (kA) | 17.32 | - | - |
| Short-Time Withstand Current (kA/4s) | 20/4 | - | 25/4, 20/4 |
| Mechanical Life (Operations) | 5000 | 3000 | 10000 |
2. Environmental Conditions
| Environmental Parameter | Specification | Test Standard |
|---|---|---|
| Operating Temperature Range | -25°C to +40°C | IEC 62271-1 |
| Storage Temperature Range | -40°C to +70°C | IEC 60068-2-1/2 |
| Relative Humidity | ≤95% (non-condensing) | IEC 60068-2-30 |
| Altitude (without derating) | ≤2000m | IEC 62271-1 |
| Seismic Withstand | 0.5g horizontal, 0.25g vertical | IEC 62271-3 |
3. Safety Specifications
| Safety Feature | Specification | Standard Compliance |
|---|---|---|
| Internal Arc Classification | AFLR 25kA/1s | IEC 62271-200 |
| Degree of Protection | IP4X (front), IP2X (other sides) | IEC 60529 |
| Interlocking System | 5-position mechanical interlock | IEC 62271-1 |
| Grounding System | Short-circuit capacity: 25kA/4s | IEC 62271-1 |
| Gas Monitoring | Density monitoring with 2-stage alarm | IEC 62271-203 |
4. Physical Specifications
Dimensions
Standard dimensions: 800mm (W) × 1500mm (D) × 2200mm (H). Modular design allows for flexible configurations.
Weight
Approximately 850kg fully assembled. Individual modules designed for easy handling and installation.
Finish
Powder-coated finish in standard RAL 7035 (light grey) or custom colors available upon request.
5. Communication and Monitoring
Communication Interfaces
The NXRING-24 can be equipped with various communication interfaces for integration with SCADA systems and remote monitoring. Standard interfaces include RS485 with Modbus RTU protocol. Optional interfaces include Ethernet with Modbus TCP, IEC 61850, Profibus DP, and DeviceNet.
Monitoring Options
SF6 gas density monitoring with two-stage alarm (warning and lockout)
Temperature monitoring for cable connections and busbars
Partial discharge monitoring for early fault detection
Motor operation counter and spring charge monitoring
Position indication for all switching devices
Applications
NXRING-24 is suitable for a wide range of medium voltage distribution applications across various industries
1. Typical Applications
Industrial Plants
Primary and secondary distribution in manufacturing facilities with high power demands and critical reliability requirements.
Automotive manufacturing
Chemical processing
Metal fabrication
Food and beverage production
Commercial Buildings
Power distribution for commercial complexes, shopping centers, hotels, and office buildings.
High-rise office buildings
Shopping malls
Hotel complexes
Convention centers
Healthcare Facilities
Critical power distribution for hospitals, clinics, and medical facilities where uninterrupted power is essential.
Hospitals
Medical centers
Research laboratories
Pharmaceutical manufacturing
Transportation
Power distribution for railway electrification, airports, and transportation infrastructure.
Railway traction substations
Airport terminals
Metro and subway stations
Bus depots
Renewable Energy
Grid integration for solar PV systems, wind farms, and energy storage facilities.
Solar power plants
Wind turbine connections
Battery energy storage
Microgrid interconnection
Data Centers
High-reliability power distribution for data centers and IT infrastructure with critical uptime requirements.
Tier III/IV data centers
Cloud computing facilities
Telecommunications hubs
Colocation facilities
2. Installation Conditions
Installation Requirements
The NXRING-24 is designed for indoor installation in clean, dry environments. The switchgear should be installed on a level, solid floor capable of supporting the equipment weight. Adequate clearance should be provided around the equipment for operation, maintenance, and ventilation.
Installation Clearances
Front clearance: ≥1200mm for operation and maintenance
Side clearance: ≥800mm for cable connections
Rear clearance: ≥800mm for ventilation and access
Overhead clearance: ≥2200mm for safe operation
3. Maintenance Requirements
| Maintenance Activity | Frequency | Estimated Time | Personnel |
|---|---|---|---|
| Visual Inspection | Annually | 1-2 hours | Qualified technician |
| Mechanical Operation Check | Every 5 years | 4-6 hours | Certified technician |
| Gas Density Check | Every 10 years | 2-3 hours | Certified technician |
| Comprehensive Testing | Every 10 years | 8-12 hours | Specialist team |
| Major Overhaul | Every 20 years | 2-3 days | Factory-trained specialists |
Ordering Information
Technical specifications and ordering details for NXRING-24 gas insulated ring main unit
1. Model Designation
Model Number Explanation
NXRING-24-[Function]-[Current Rating]-[Options]
Function Codes
LS: Load Switch unit
CU: Combination unit (fuse-switch)
VCB: Vacuum circuit breaker unit
Current Ratings
400A: 400 Amperes
630A: 630 Amperes
Option Codes
M: With motor operating mechanism
T: With temperature monitoring
C: With communication interface
S: With special paint finish
2. Delivery Information
Delivery Time
Standard delivery: 8-10 weeks after order confirmation. Express delivery: 4-6 weeks (subject to availability).
Packaging
Wooden crate packaging with weather protection. Each unit individually packed with documentation and accessories.
Documentation
Comprehensive documentation including operation manual, maintenance manual, test reports, certificates, and drawings.
3. Warranty and Support
Warranty Information
The NXRING-24 is covered by a 24-month warranty from the date of delivery. The warranty covers defects in materials and workmanship under normal use and service conditions.
Technical Support
Comprehensive technical support is available throughout the product lifecycle. Our support includes:
Installation and commissioning support
Operator and maintenance training
Remote technical assistance
Spare parts availability for 15+ years
Field service by trained technicians
