Ring Main Unit Assembly Production Line
Material supply system
- Intelligent warehousing: use stereoscopic warehouse or automated shelving cabinets to store core components such as cabinet bodies, switches, and insulators.
- Logistics distribution: AGV(Automated Guided Vehicles) or suspended chain conveyance systems ensure precise material delivery.
- Intelligent picking: utilizes RFID or visual recognition technology to automatically match materials with production orders.
Cabinet Pre-treatment Section
• Sheet Metal Processing: Laser cutting/bending center completes precise cabinet shaping.
• Surface Treatment: Automated spray line achieves corrosion protection (such as epoxy powder spraying).
• Leak Detection: Helium mass spectrometer leak detector performs micro-leak detection on pressurized cabinets (accuracy up to 10^-6 mbar·L/s).
Core assembly module
- Switchgear module: The robotic arm automatically assembles vacuum interrupters, with a torque control system ensuring bolt tightening precision (±3%).
- Busbar system: CNC busbar processing machines achieve ±0.1mm bending accuracy and automatically wrap insulating materials.
- Secondary system: Automated crimping equipment completes the assembly of control wiring harnesses, and the test bench immediately detects circuit impedance.
Testing and verification system
- Mechanical characteristic testing: High-speed cameras record the opening and closing process of switches (time resolution 0.1 ms).
- Electrical tests: 200 kV power frequency withstand voltage equipment + Ultra-high frequency partial discharge detection (sensitivity 1 pC).
- System integration testing: Automatic injection of fault current to verify the accuracy of protective actions.
The Features
Hybrid production model
• Utilizes a layout of 'automation islands + manual workstations', with key processes such as busbar processing fully automated (cycle time 0.8 minutes per piece), while complex assembly retains points for manual intervention
Digital twin applications:
• Optimize assembly processes through 3D simulation (such as virtual validation of mechanical linkages and fitment), ensuring actual assembly errors are controlled within ±0.05mm.
Special environmental control
• Establish a Class 10,000 clean room for insulator assembly, with temperature and humidity controlled at 23±2°C/45±5% RH. The SF6 handling area is equipped with a negative pressure exhaust system, achieving a gas recovery rate of over 99.9%.
Full-process quality traceability
Each cabinet generates a unique DNA code, recording over 200 production data points (including bolt torque curves, vacuum level change curves, etc.).
Application Scenarios
Urban Power Grid System
1. Distribution Substation/ Switching Station
- Acts as a node device for 10kV-40.5kV distribution networks, facilitating power distribution and fault isolation.
- Typical application: Smart ring network cabinets in urban underground conduits (integrated DTU for 'three remote' functions)- Technical specifications: Protection level IP67, short-circuit breaking capacity of 25kA.
2. Cable Branch Box Upgrade
- Replaces traditional cable branch boxes, featuring automatic fault location capabilities.
- Case study: Singapore's 'Smart Grid' project uses fully insulated RMUs, reducing fault recovery time by 80%.
New Energy Power Generation Field
1. Photovoltaic/Wind Power Collection System◦ 35kV ring main units used to collect inverter output current◦ Special requirements: salt mist corrosion resistance (C5 level), ability to operate at -40°C low temperatures
2. Energy Storage Power Station
◦ Ring main protection system between battery clusters◦ Innovative application: Huawei's intelligent energy storage solution uses RMU equipped with 5G communication modules
Industrial Power Usage Scenarios
1. Power Supply for Industrial Parks
◦ Dual power source ring network cabinets ensure continuous power supply (MTBF > 100,000 hours)◦ Typical case: Tesla's Shanghai factory uses dual-bus RMU architecture
2. Power Supply for Mines/Oilfields
◦ Explosion-proof design (Ex d IIC T4 standard)
◦ Vibration resistance requirement: Passed random vibration tests from 5 to 500 Hz