1. Electrical equipment will produce higher harmonics when it produces abnormality and deterioration, and the abnormality and deterioration of motors, loads, and inverters are used to distinguish the higher harmonics from 2 to 40 times, and the data is changed by FFT, and the decomposition is made on the basis of the analysis data of long-term savings, and the deterioration parts of specific electrical equipment are analyzed.
2. Motor (electrical cause)
When there is dust adhesion and sensation in the gap between the fixer and the rotor, the uneven generation of eccentricity on the rotor will deform the spatial beam waveform. When the insulation of the coiled wire deteriorates and the coiled part overheats, the distribution waveform of the leakage magnetic beam generated by the coiled current will be deformed, and the current will contain higher harmonics.
3. Motor (mechanical factor)
When the motor and load are not in operation, there is an inherent number of sensations. The number of intrinsic sensations changes when there is an abnormality with the promotion of deterioration. The number of oscillations after the change becomes a mechanical resonance, which contains higher harmonics in the current.
4. Inverter
The higher harmonics generated from the inverter are generated from all electrical appliances and electronic components. For example, the slippery capacitors used when converting a three-phase AC power supply to a DC power supply are only characteristic of generating wave-shaped currents during charging. However, the flow direction of the AC and DC power supply currents is different, which causes the sine wave and pulse wave to synthesize to produce higher harmonics. In general, under the ideal situation, the charging current of the slippery capacitor does not produce pulse wave current, but with the deterioration of the capacitance, the capacitance decreases, and the low-frequency high-harmonic component will increase.
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Sensitive operation form, satisfactory business operation policy:
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Is there still an output after the UPS power is turned off?
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(2) ...
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