A Bearing Manufacturing Plant in Kunshan
Established in 1995 to replace the high-quality, low-noise miniature ball bearings that had long relied on imports, this plant is mainly engaged in the production and sale of single-row ball bearings and automotive-specific bearings. Its products are widely used in household appliances, general motors, general industrial machinery, as well as automobiles, motorcycles and other fields, making significant contributions to the development of China's modern industry.
The production equipment in the workshop mainly generates 5th and 7th harmonic currents, which are directly injected into the power supply system, causing distortion of the power supply voltage waveform. The poor power quality has adversely affected the production yield of the equipment.
Figure 1: Various Precision Bearings
The recommended solution is to install one set of NCSA Active Harmonic Filter and one set of NCSD Tuned Filter. These devices are used to mitigate the 5th and 7th harmonic currents of the system and compensate the system power factor respectively, which can effectively reduce the distortion degree of the system voltage waveform, improve the power quality of the power supply system, and enhance the production yield of the workshop.
Key Features of NCSA Active Harmonic Filter
- Filters system harmonics, suitable for various harmonic environments with no overload issues
- Fast dynamic compensation response time ≤ 20 ms
- Multiple harmonic filtering modes and compensation functions available
- Capable of full-load output current
- High-reliability IGBT protection architecture with excellent stability
- Touchscreen graphical human-machine interface for easy operation
Figure 2: Cabinet Diagram of NCSA Active Harmonic Filter
Key Features of NCSD Tuned Filter
- Compensates the system power factor
- Effectively prevents the occurrence of system harmonic resonance
- Equipped with an automatic power factor controller, enabling step-by-step switching and adapting to the reactive power output required by the system
Figure 3: Cabinet Diagram of NCSD Tuned Filter
Since the filters were put into operation on October 8, 2014, they have significantly reduced the total harmonic current distortion rate of the system. The power quality measurement data of the system main circuit before and after the improvement are summarized in Table 1.
Table 1: Summary of System Improvement Effects (Before & After)
Figure 4: System Voltage and Current Waveforms (Before Improvement)
Figure 5: System Voltage and Current Waveforms (After Improvement)
Figure 6: Time-Lapse Graph of Total Harmonic Current Distortion Rate (Before & After Improvement)