1, if the harmonic content in the system is very small and only considering limiting the inrush current, the k= (0.5~1) can be selected to meet the standard requirements. However, the reactor is magnified to 5 harmonic currents, and the harmonic amplification is slight for 3 times.
2, if the harmonics existing in the system should not be neglected, the background harmonic content of the power system should be ascertained, then the K value can be determined rationally. In order to achieve the aim of restraining harmonics, the distribution of reactance rate should be sensitive to the comprehensive harmonic impedance of the capacitor access place.
When the power grid background harmonics are 5 times and above, the reactance rate should be configured (4. $number)%. The general situation of the power grid is: 5 harmonics maximum, 7 times second, 3 times smaller. Therefore, in the project, choose K=4. $number reactors are more, international is also commonly used.
The reactor with 6% can restrain 5 harmonics, but the reactor has a significant amplification of 3 harmonics. Its reactor resonant point (204HZ) away from 5 times the frequency of harmonics (250HZ), a larger reactor.
Configuration of 4.5% reactor to 3 harmonic amplification slightly, so in the suppression of 5 times and above harmonic reactors, but also to reduce the 3 harmonic amplification, in this case is appropriate. But its resonant point (235HZ) and 5 harmonic frequency spacing is small.
When the background harmonic in the system is 3 times and above, the reactor with reactance rate of 12% should be configured. In recent years, because the reactor does not 3 times harmonics Source's electrical equipment unceasingly increases, causes the system the 3 times harmonics to increase unceasingly, especially the metallurgical industry this phenomenon cannot neglect.
In short, the principle of the configuration reactor is: must be based on the system background harmonic content to consider and determine the reactor.
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