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-BP Series Passive Harmonic Filter for VFD Systems
The HYFC-BP series passive harmonic filter is specially designed for frequency converters (VFDs). Developed and manufactured by Hongyan Electric, it applies wide-band Fourier analysis filtering technology and integrates digital monitoring modules to record and analyze key electrical parameters in real time.
Product Overview
The HYFC-BP series passive harmonic filter is specially designed for frequency converters (VFDs). Developed and manufactured by Hongyan Electric, it applies wide-band Fourier analysis filtering technology and integrates digital monitoring modules to record and analyze key electrical parameters in real time. The system intelligently switches filtering circuits and effectively suppresses 5th, 7th, 11th, and higher-order harmonics, purifying the power network, preventing electromagnetic interference, and significantly improving the power factor of VFD systems. It also provides notable energy-saving benefits for industrial operations.
Key Features
- ● Effectively eliminates harmonic currents and meets GB/IEC harmonic control requirements
- ● Improves system power factor to ≥0.95, reducing energy losses
- ● Supports automatic, intelligent switching and dynamic filtering
- ● Steel-plate enclosure with IP20B protection level
- ● Compact design, easy installation and maintenance
- ● Compatible with VFDs of all major brands
- ● Enhances VFD reliability and prevents harmonic-related malfunctions
- ● Ensures stable system operation and long equipment lifespan
Main Components
- Harmonic filter capacitor bank
- Harmonic filter reactor
- Power switching device (or TSC thyristor switch)
- Protection unit
- Filter controller
- Signal terminal blocks
Technical Specifications
| Item | Specification |
|---|---|
| Installation | Indoor, floor-mounted or wall-mounted |
| Rated voltage | 400V / 525V / 660V |
| Harmonic suppression ratio | ≥70% |
| Protection level | IP20B |
| Operating altitude | ≤2000m |
| Relative humidity | ≤90% (at +20°C) |
| Connection method | Cable or busbar |
| Rated frequency | 50Hz (60Hz optional) |
| System power factor | ≥0.95 |
| Cooling | Natural cooling or forced-air cooling |
| Ambient temperature | –10°C ~ +40°C |
Harmonic Generation & Suppression (Principle)
VFD rectifier circuits generate a large number of harmonic currents. When injected into the power grid, these harmonics distort the voltage waveform, interfere with other electrical equipment, and decrease overall system reliability. According to national harmonic management standards, harmonic currents injected into the grid must be properly filtered to protect downstream electrical equipment and prevent safety hazards.
Since 1993, national standards have regulated the maximum allowable harmonic current for electrical equipment. If the measured harmonic value exceeds the standard, effective filtering must be implemented.
Typical Harmonic Injection of VFDs (Based on 50Hz AC Grid)
| Harmonic Order | 5th | 7th | 11th | 13th | 17th | 19th | 23rd | 25th |
|---|---|---|---|---|---|---|---|---|
| Maximum injection (%) | 38 | 14.5 | 7.4 | 3.4 | 3.2 | 1.9 | 1.6 | 1.3 |
| Average injection (%) | 28 | 9.1 | 7.2 | 4.1 | 3.2 | 2.4 | 1.7 | 1.4 |
Recommended Applications
- Variable frequency drive systems
- HVAC and compressor systems
- Pumps and fans with VFD control
- Industrial automation equipment
- Production lines with nonlinear loads
- Equipment requiring improved power factor and harmonic control
Ordering Information
To configure the correct model, please provide:
- Rated voltage (400V / 525V / 660V)
- VFD rated power and model
- Required harmonic suppression level
- Installation method (floor / wall)
- Environmental conditions (temperature, altitude, humidity)
- Whether TSC thyristor switching is required
- Cabinet color or layout preference
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.