Load characteristics
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Non-ferrous metals refining and chemical industries have to use electrolysis of this process, which can not be separated from high-power rectifier device.
◆ less load fluctuations;
◆ For high-power three-phase full-bridge 6-pulse rectifier device, the harmonics generated by the rectifying device account for 25-33% of the fundamental wave and produce characteristic harmonics of 6N ± 1 times, that is, the number of characteristics on the network side 5, 7, 11, 13, 17, 19, 23, 25 times, etc., with the 5th and 7th harmonic components being largest and decreasing sequentially. Rectifier transformer with phase shifting winding parallel operation can be composed of 12 pulses, the number of characteristics of the network side of 11 times, 13 times, 23 times, 25 times, to 11 times, 13 times the maximum;
◆ Harmonic effect on the rectifier; Rectifier transformer winding loss and heat increase in the harmonic effect; Rectifier itself is a harmonic source in operation, but at the same time the trigger control system is affected by the voltage harmonics, commutation process of the rectifier The voltage will appear "gap", affecting the detection of voltage zero crossing, affecting the control of the trigger synchronization;
◆ Harmonic insulation accelerated aging, increase the probability of cable failure;
◆ For reclosing, high harmonics delay the time of arc extinguishing obviously, resulting in the failure of single-phase reclosing or the use of longer dead time for single-phase reclosing, which is unfavorable to the stability of system operation. Low power factor
solution
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In general, in the system of large power grid, using high voltage passive filter compensation device can filter out its characteristic harmonics, to meet the governance goals. If the grid system is small, the goal of harmonic control is high. In addition to installing large-capacity passive filter devices, small-capacity active filters can be mixed to achieve the higher requirements of power quality management. For different rectifier rectifier system wiring system, our professional filter compensation device has a different targeted design, after field testing, users can "tailor-made" to take the most practical on-site management programs.
