release time:2022-03-17Author source:SlkorBrowse:735
What are harmonics?
Harmonic is not a strange word in the power industry. The interference of higher harmonics is a major "public hazard" affecting the power quality in the current power system, and it is urgent to take countermeasures.
Harmonic is a steady power quality index parameter, which must be distinguished from transient phenomenon. Many people hope that harmonic protectors can filter harmonic waves to reduce losses, so are harmonic protectors really that magical and useful? Can it improve the power quality to some extent?
1 Definition of harmonics
Internationally recognized harmonics are defined as:
Harmonic refers to the components of voltage and current whose frequency is an integral multiple of the fundamental wave. Generally, it refers to the components of voltage and current whose periodic sinusoidal voltage and current are decomposed by Fourier series and whose frequency is an integral multiple of the fundamental wave.
Harmonic is a steady power quality index parameter, which must be distinguished from transient phenomenon. Generally speaking, the waveform of harmonics repeats periodically, while the transient phenomena such as high-frequency noise, pulse spikes, power surges, etc. change or attenuate in the waveform every week, so they are not considered as harmonics, but only as a transient phenomenon.
ANHPD is a new type of protection device used to filter out higher harmonics and protect precision instruments and equipment. It adopts ultra-microcrystalline alloy materials and innovative special circuits. It is mainly composed of voltage clamp, low-pass filter and absorber. It can not only suppress and absorb the random high-order harmonics generated by users' electrical equipment, including page 2, page 8, and the interference of high-frequency noise, pulse spikes and surges, but also track the voltage waveform at any time, instantly filter out the spikes, surges and clutter in the power supply, correct the high-order harmonics caused by harmonic influences, eliminate harmonic pollution from the source, and provide protection for electrical equipment.
ANHPD reference standard
GB/T14549-1993 power quality: harmonics of public power grid GB/T15945-2008 power quality: allowable deviation of power system frequency
GB17625.1-2012 Electromagnetic Compatibility Limits Harmonic Current Emission Limits
IEEE 519-1992 International Harmonic Control Standard Q31/Q31/0114000129C026-2017《ANHPD Harmonic Protector
To sum up, the harmonic protector does not have the function of harmonic filtering from 350 Hz to 20 MHz:
(1) high-frequency noise, pulse spikes, surges and other disturbances generated by electrical equipment do not belong to the category of harmonics, and filtering these transient harmonics is not harmonic filtering;
(2) The filter device should have a certain energy density to meet the demand of energy exchange with the harmonic source. The harmonic protector is a passive device. If the harmonic can be filtered, there must be energy storage elements inside, but the size of the harmonic protector is very small (145mm*120mm*70mm). Such a small size can only exchange energy with the harmonic source with a large energy density, which is impossible for ultra-microcrystalline alloy materials.
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