Zhejiang Hongyan Electric Co., Ltd. 
ENGINEERED SOLUTION
Steel & Metallurgy
Power factor correction, harmonic mitigation and voltage support for electric arc furnaces, rolling mills, cranes and high-load metallurgical production lines.
HYFC-ZJ Series Passive Harmonic Filter & Reactive Compensation Device for Rolling Mills
The HYFC-ZJ series passive harmonic filter and reactive compensation device is specially developed for heavy-load rolling applications. In cold rolling, hot rolling, aluminum oxidation, electrophoresis, and related production lines, severe harmonic currents are generated.
Product Overview
The HYFC-ZJ series passive harmonic filter and reactive compensation device is specially developed for heavy-load rolling applications. In cold rolling, hot rolling, aluminum oxidation, electrophoresis, and related production lines, severe harmonic currents are generated. These harmonics cause rapid insulation degradation of cables and motors, increased losses, reduced motor efficiency, transformer derating, and potential failures.
When user-side harmonic distortion causes supply-side voltage waveform THD to exceed national limits, electricity tariffs increase and in severe cases power supply may be restricted or even cut off. Therefore, both from the perspective of equipment protection and user economic benefits, harmonic suppression and power factor improvement are essential.
Technical Performance
- ● Uses controllable switching devices to achieve fully automatic harmonic filtering without inrush current, no switching transients, no capacitor overvoltage, and no repeated excitation
- ● Supports continuous frequent switching without affecting capacitor lifespan; fast response; minimal noise
- ● Adopts dynamic compensation controller with reaction time < 20 ms
- ● Provides over-voltage, over-current, and over-temperature protection; filters 5th, 7th, 11th, 13th and other typical rolling-mill harmonics
- ● Ensures system harmonic distortion meets national grid limits; THDu can be reduced below regulated thresholds
- ● Rated for 10 kV class harmonic environments; compliant with national standards
- ● Improves system power factor to COSΦ ≥ 0.92 (or 0.95–0.99 with optimized configuration)
Compensation Modes
The device offers three harmonic-reactive compensation configurations optimized for rolling mill loads:
● Three-phase common compensation
- Suitable for systems with balanced three-phase loads
- Provides the highest cost-performance ratio
- Recommended for rolling equipment with uniform operating conditions
● Three-phase separated compensation
- Designed for systems with significant three-phase imbalance
- Corrects harmonic deviation and uneven reactive demand on each phase
- Ensures stable electrical performance under sudden load shocks
● Mixed common + separated compensation
- For rolling lines with both global and localized phase imbalance
- Avoids over-investment while maximizing compensation accuracy
- Widely used in large hot-rolling and cold-rolling mills
Device Composition
- Harmonic filter capacitor bank (210V / 315V / 400V / 600V / 900V / 1300V)
- High-quality filter reactor
- Controllable switching module
- Dynamic harmonic compensation controller
- Protective components and signal modules
Equipment Description
Our low-voltage dynamic harmonic filtering and reactive compensation system is designed for rolling mills and heavy-impact loads below 10 kV. Rolling mills generate high levels of harmonic and reactive power fluctuations caused by:
- Continuous variable-load motors
- Reversing mills
- Pickling lines
- Aluminum oxidation lines
- Electrophoretic coating lines
The HYFC-ZJ device suppresses harmonics and reduces THDu according to GB/T 14549-93 standards. It significantly improves power quality, lowers system losses, increases production reliability, and reduces enterprise operating costs.
It is widely used in:
- Steel rolling mills
- Aluminum rolling and oxidation lines
- Oil & petrochemical plants
- Ports & shipyards
- Large factories and industrial parks
- Rolling line auxiliary equipment
The device ensures safe operation, reduces penalties from excessive harmonic injection, and prevents transformer derating caused by rolling mill loads.
National Harmonic Limit Reference (GB/T 14549)
| Rated Voltage (kV) | THD (%) | Max Single Harmonic (%) | Typical Harmonic Orders |
|---|---|---|---|
| 0.38 | 5.0 | 4.0 | 5, 7, 11 |
| 6/10 | 4.0 | 3.2 | 5, 7, 11, 13 |
| 35 | 2.0 | 1.6 | 5, 7, 11, 13 |
(Values taken from GB/T 14549 national harmonic emission limits)
Core Advantages
- ● Effectively suppresses rolling-mill harmonics: 5th, 7th, 11th, 13th
- ● Improves motor and transformer efficiency, extends insulation life
- ● Prevents cable overheating, reduces losses, prevents derating
- ● Eliminates nuisance tripping and improves production stability
- ● Reduces penalties due to excessive harmonic injection
- ● Ensures contract compliance and prevents power-supply restrictions
- ● Enhances power factor, reduces electricity costs
Ordering Information
Please specify the following when ordering:
- System rated voltage (0.38kV / 0.4kV / 0.66kV / 6kV / 10kV…)
- Harmonic levels and required filtering percentage
- Rolling-mill type (cold / hot / reversing / continuous)
- Load rated capacity and motor models
- Required compensation mode (common / separated / mixed)
- Installation method and cabinet size requirements
- Ambient temperature, humidity, and site conditions
Related Products
Send Inquiry
FROM EQUIPMENT TO APPLICATION
See where this equipment fits in the system
Connect product selection with the network problem it addresses and review comparable project conditions before preparing an enquiry.
Relevant Solutions
All Solutions
Application Cases
All Cases
PROJECT REFERENCE
High Voltage Compensation Unit
High-voltage power factor correction configured for an outdoor industrial distribution system with a target power factor above 0.95.
PROJECT REFERENCE
Transformer Cooling & Efficiency Project
Coordinated power-quality and thermal operating measures for a large-capacity transformer serving a variable industrial load.