The main harmonic sources in health care projects are electronic medical precision equipment, air conditioning, lighting, UPS, etc.

1. Electronic medical precision equipment, large-scale electronic medical equipment is generally powered by switching power supply, and the switching power supply will generate 3, 5, and 7 harmonics to be injected into the power grid.

2. Computer, computer is not only the necessary equipment for every office worker, but also has become an important home entertainment device. Single-phase rectification (ie, 4-pulse rectification) is commonly used in electronic equipment. The number of harmonics generated is an integer multiple of the pulse wave number ± 1, that is, the 3rd, 5th, 7th, and 9th harmonics.

3. Lighting equipment, energy-saving lamps will cause serious harmonic currents, of which the 3rd harmonic is the highest, the 3rd harmonic will be superimposed on the midline in algebraic form, resulting in excessive neutral current, severe heat, serious Causes the line to linger.

4. Air conditioning ventilation equipment: hospitals generally use inverter fans and air conditioning. The frequency converter is a very serious harmonic source, and its total harmonic current distortion rate is more than 30%, which will generate a large number of 5th and 7th harmonics to pollute the power grid.

1. Centralized management: DBL-AP7/ATP7 series reactive power compensation device + DBL-APF series active filter

Terminal local management: DBL-PQ terminal power quality device + DBL-NP series neutral line security energy-saving device

2. Centralized management: DBL-AP7/ATP7 series reactive power compensation device + DBL-SVG static var generator + DBL-APF series active filter (DBL-AP7/ATP7 mixed with SVG)

Terminal local management: DBL-PQ terminal power quality device + DBL-NP series neutral line security energy-saving device

3. (Recommended) centralized management: DBL-SVG static var generator + DBL-APF series active filter

Terminal local management: DBL-PQ terminal power quality device + DBL-NP series neutral line security energy-saving device