A Paper Mill in Shanghai
The company's business development in China began in 1994, and it has continuously expanded its production facilities in the country, making China one of its increasingly important global production bases for products. Its main business scope includes the production and sale of baby care products, feminine care products, adult care products, health care products, household tissue, and consumer paper products.
The frequency conversion devices adopted by the rewinding machines in its papermaking workshop generate a large amount of harmonic currents during operation, which cause additional vibration and noise in the motors and affect the production quality of the papermaking section.
Figure 1: Papermaking Workshop of the Paper Mill
The recommended solution is to install 3 sets of harmonic filters, including 2 sets of NCSF 5th Harmonic Filters and 1 set of NCSF 7th Harmonic Filter, to mitigate the 5th and 7th harmonic currents of the system and improve the power quality of the power supply system.
Key Features of NCSF Harmonic Filter
- Significantly reduces the harmonic current content and harmonic voltage distortion rate of the system
- Achieves an improvement effect of over 80% for targeted specific harmonics
- Compensates for the system's reactive power and improves the power factor
- Effectively lowers harmonic losses in the system
Figure 2: Cabinet Diagram of NCSF Harmonic Filter
Since the harmonic filters were put into operation in August 1995, they have significantly reduced the system's total harmonic current distortion rate and total harmonic voltage distortion rate while improving the system power factor. 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 3: System Voltage and Current Waveforms (Before Improvement)
Figure 4: System Voltage and Current Waveforms (After Improvement)
Figure 5: Time-Lapse Graph of Total Harmonic Current Distortion Rate (Before & After Improvement)