摘要：
The static phase-advancing cabinet is designed to improve power factor, reduce reactive power, and enhance energy efficiency in industrial electrical systems. It features reliable components and stable operation for long-term use in factories and large facilities.
Static Excitation Cabinet: Advanced Solution for Motor Efficiency and Energy Saving
01 Product Overview
O Static Excitation Cabinet is a modern reactive power compensation device designed for medium and large wound-rotor asynchronous motors. By connecting in series with the motor rotor circuit, it adjusts the phase relationship between rotor current and voltage, significantly improving the motor power factor, reducing stator current, and minimizing motor and line losses.
As an upgrade to conventional capacitor compensation or rotary excitation systems, static excitation cabinets feature no moving parts, no commutators, dust resistance, and long service life, making them ideal for industries such as cement, chemical, steel, metallurgy, and mining.
02 Working Principle and Technical Features
1. Intelligent Operation
The cabinet is connected in series with the motor rotor circuit. During operation, it modifies the phase of rotor current relative to rotor voltage, optimizing the stator current and voltage phase, improving the motor's intrinsic efficiency and power factor.
Unlike capacitor compensation, which only reduces reactive power flow on the grid, static excitation cabinets enhance the motor’s internal operation, achieving higher efficiency directly at the motor level.
2. Core Technical Features
- Advanced Frequency Conversion: Uses AC-AC frequency conversion and microprocessor control for real-time adaptive compensation.
- No Moving Parts: Eliminates issues of dust sensitivity and short lifespan seen in traditional rotating exciters.
- Intelligent Digital Control: High-performance microprocessor enables fully digital, automated, and adaptive compensation.
03 Core Components and Structure
The system consists of multiple key subsystems designed for long-term stability and reliable performance.
1. Key Components
- Control Core: High-performance microprocessor for intelligent digital control.
- Power Modules: High-power thyristor-based AC-AC conversion circuits for rotor current phase regulation.
- Detection System: High-precision sensors provide real-time monitoring of motor operating parameters.
2. Protection and Cooling
- Comprehensive Protection: Includes overcurrent, overheat, and stator current oscillation protection.
- Efficient Cooling Design: Optimized airflow and heat dissipation structure extend component lifespan.
- Intelligent Diagnostics: Fault self-check and automatic corrective measures simplify maintenance.
04 Performance and Advantages
1. High-Efficiency and Energy Saving
- Power Factor Improvement: Can raise motor power factor to 0.95–0.98.
- Reactive Power Reduction: Reduces reactive power by over 60%, saving energy.
- Stator Current Reduction: Cuts stator current by 10–20%, lowering copper and line losses by 20–30%.
2. Intelligent Control
- Adaptive Compensation: Fuzzy control technology automatically adjusts compensation according to motor load.
- Full Digital Control: Ensures precise and rapid signal processing.
- No Circulating Current Design: Eliminates overheating and reliability issues common in older designs.
3. Safety and Reliability
- Complete Protection Functions: Automatic fault protection with simple operation.
- High Reliability Design: Modular design and premium components ensure long-term stability.
- Smart Alarm System: Real-time monitoring and alerts for abnormal conditions.
05 Technical Specifications
| Parameter | Specification |
|---|---|
| Applicable Motor | Medium and large wound-rotor asynchronous motors |
| Power Range | 90–6000 kW (customizable) |
| Rotor Current | Up to 2500 A (depending on model) |
| Tensão nominal | 380 V, 6 kV, 10 kV |
| Power Factor | 0.95–0.98 (after compensation) |
| Operating Temperature | -10℃ to +40℃ |
| Classe de proteção | IP20, IP30 (customizable) |
| Altitude | ≤2000 m (customizable) |
06 Application Areas
1. Indústria pesada
- Cement: Ball mills, crushers, fans.
- Steel & Metallurgy: Rolling mills, compressors, large fans.
- Mining: Hoists, crushers, conveyors.
2. Complex Process Industries
- Chemical: Pumps, compressors.
- Paper: Large pulping machines, fans, pumps.
- Wood Processing: Heavy-duty grinders and milling machines.
3. Special Operating Conditions
- Variable Loads: Rolling mills, sugar mill shredders.
- Harsh Environments: Dusty or challenging industrial conditions.
- High Energy Consumption: Large motors critical for industrial power use.
07 Selection and Installation Guide
Selection Considerations
- Motor Specifications: Model, rated power, stator and rotor voltage/current.
- Load Characteristics: Steady or variable loads, range of fluctuations.
- Environment: Temperature, humidity, dust, and protection requirements.
- Installation Space: Ventilation, clearance, and distance from motor.
Installation Environment
- Safe Location: Free from explosive, corrosive gases, and excessive vibration.
- Ventilation: Minimum 500 mm clearance above cabinet; if in a trench, raise 100 mm from floor.
- Electrical Conditions: Three-phase AC 380V ±10%, compliant with electrical codes.
08 Maintenance and Troubleshooting
Routine Maintenance
- Cooling System Check: Verify cooling fans; repair or replace if stopped.
- Contactor Inspection: Inspect main contactor terminals to extend lifespan.
- Dust Removal: Regular cleaning to prevent transformer overheating.
Common Faults
- Current Fluctuations: Disconnect and inspect if stator current swings significantly after excitation.
- Startup Checks: Observe control unit indicators after extended downtime.
- Professional Service: Engage specialists for complex faults.
09 Economic and Operational Benefits
Economic Benefits
- Energy Savings: Higher power factor and reduced reactive power.
- Cost Recovery: ROI typically within six months.
- Utility Incentives: Avoid penalties and gain power factor rewards.
Operational Benefits
- Extended Motor Life: Lower temperature, improved overload capability.
- System Stability: Reduced stator current, improved supply qualidade.
- Lower Maintenance Costs: Dust-resistant, no moving parts, long service life.
Conclusão
O Static Excitation Cabinet optimizes motor efficiency, reduces energy losses, and ensures reliable operation of medium and large wound-rotor asynchronous motors. Its intelligent control, robust design, and energy-saving performance make it an essential solution for industries pursuing high-efficiency, low-cost, and sustainable operations.
Selecting a Static Excitation Cabinet ensures long-term savings, improved motor reliability, and enhanced industrial productivity.
Shaanxi Public Network Security No. 41032502000206
