Jiangsu Hengli Group

Active Harmonic Filter

The Industry

Reduced harmonic levels results in improved electrical network reliability and reduced operating costs. Nuisance tripping of protective devices and nuisance clearing of fuses due to harmonic heating effects is greatly reduced.

Overheating of motors, transformers, switch-gear and cables is also reduced which increases their life expectancy and reduces maintenance costs. For new installations, over-sizing of distribution equipment to reduce harmonic susceptibility can be reconsidered.

Background

With the development of social economy and science technology, many textile printing and dyeing enterprises in order to improve the product quality of transformation technology, large use of VFDs, DC equipment, including ventilation equipment (including frequency conversion fan and air conditioning), lighting equipment, production equipment (yarn, fine sand, grasp cotton, shaping machine, dyeing cylinder, etc.), produce a large number of 5th,7th order harmonic, cause harmonic, harmonic pollution, lead to power quality decline.

Power Quality Problem

Jiangsu Hengli Group is specialized in the production of non-woven fabric manufacturer, producing a variety of short fiber non-woven cloth, varieties of melt-blown non-woven cloth, synthetic leather non-woven cloth, acupuncture non-woven cloth, propylene non-woven cloth, water absorption pad, filter non-woven cloth, antibacterial cotton, automotive interior materials, oil absorption mat and other non-woven products.

Solution

The site load mainly includes carding machine, needle acupuncture machine, non-woven oven, coil machine, etc., which will produce a large number of harmonics in the production process, resulting in the field capacitance compensation cabinet can not work normally.In order to ensure the normal operation of the field capacitors cabinet, the 300A Active Harmonic Filter cabinet is installed on site for harmonic mitigation.

Performance

The THDV at site is 5.9%, exceeding the national standard limit of 5%, the THDi is 23.5%, the harmonic current is mainly 3rd, 5th, 7th order harmonics, and also contains a small number of 2nd and 4th even harmonics. After treatment, THDv decreased to 2.2%, the THDi decreased to 2.0%, and the current waveform was also restored to the sinusoidal wave type.