A Textile Mill in Suzhou
Established in 2002 and covering an area of 400 mu, it is a modern high-tech cotton spinning enterprise equipped with the world's most advanced spinning machinery and equipment. The mill holds several qualification certificates including the ISO9001 International Quality Management System Certification, Organic Cotton International Certification, CIQ Inspection-Exemption Certificate for Export, and Class A Enterprise Certification by the Customs. Adopting advanced management modes, it produces and sells various high-grade yarns for garment fabrics.
A large number of frequency conversion devices are used in its spinning workshop. However, the operation of these devices generates a large amount of harmonic current components, leading to severe distortion of the system voltage waveform, causing additional noise and vibration of the equipment, affecting production quality, and even hindering the normal production of the workshop.
Figure 1: Spinning Workshop of the Textile Mill
The recommended solution is to install one set of NCSF 5th Harmonic Filter to mitigate the 5th harmonic currents and harmonic voltage distortion rate of the system, as well as 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: NCSF 185 Harmonic Filter
Since the harmonic filters were put into operation on June 1, 2015, they have significantly mitigated the 5th harmonic currents and harmonic voltages 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 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)