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Treatment of Harmonic Sources in Medical Hospitals


2021-02-04

1. Ventilation equipment: In order to save energy, most hospitals use frequency conversion fans and air conditioners. The frequency converter is a very important source of harmonics, and its total harmonic current distortion rate is over 33%, which will produce a large number of harmonics of the 5th and 7th order to pollute the power grid.

2. Lighting equipment: Because the hospital uses a large number of fluorescent lamps, it will cause serious harmonic currents, of which the third harmonic is the highest. When multiple fluorescent lamps are connected to a three-phase four-wire load, the neutral line will flow A large third harmonic current generates 3, 5, and 7 harmonics and is injected into the power grid.

3. Computers and UPS: At present, hospitals are managed by computer networks, and there are a large number of computers. In addition, data storage systems such as servers must be equipped with backup power supplies such as UPS. The switching power supply and UPS of the personal computer are all harmonic sources, which will produce a large number of harmonics such as the 3rd, 5th, and 7th.

In short, the hospital's low-voltage power distribution system has a large number of harmonic source loads, which will generate a large number of harmonics such as the 3rd, 5th, and 7th, which will seriously pollute the power grid. A large number of single-phase non-linear loads will cause power quality problems such as unbalanced three-phase, excessive harmonics, and neutral harmonic overload, and harmonics must be controlled.

1. Ventilation equipment: In order to save energy, most hospitals use frequency conversion fans and air conditioners. The frequency converter is a very important source of harmonics, and its total harmonic current distortion rate is over 33%, which will produce a large number of harmonics of the 5th and 7th order to pollute the power grid.

2. Lighting equipment: Because the hospital uses a large number of fluorescent lamps, it will cause serious harmonic currents, of which the third harmonic is the highest. When multiple fluorescent lamps are connected to a three-phase four-wire load, the neutral line will flow A large third harmonic current generates 3, 5, and 7 harmonics and is injected into the power grid.

3. Computers and UPS: At present, hospitals are managed by computer networks, and there are a large number of computers. In addition, data storage systems such as servers must be equipped with backup power supplies such as UPS. The switching power supply and UPS of the personal computer are all harmonic sources, which will produce a large number of harmonics such as the 3rd, 5th, and 7th.

In short, the hospital's low-voltage power distribution system has a large number of harmonic source loads, which will generate a large number of harmonics such as the 3rd, 5th, and 7th, which will seriously pollute the power grid. A large number of single-phase non-linear loads will cause power quality problems such as unbalanced three-phase, excessive harmonics, and neutral harmonic overload, and harmonics must be controlled.