2. What is the corresponding k value of the reactance rate of the reactor?

The general function of a reactor is to prevent changes in current, which is achieved by converting electrical energy into magnetic energy and storing it. The current classification is also relatively rich, including parallel connection, series connection, tuning, incoming line current limiting, damping and other types. Each type has its corresponding role and value. It is necessary to understand the reactance rate k value of the reactor, which is related to the selection and use of the reactor. Below, our reactor manufacturer will share and introduce it with you!

Incoming line reactor

1. If the harmonic content in the system is small and only limiting the closing inrush current is considered, k=(0.5~1)% can meet the standard requirements. However, the reactor will severely amplify the 5th harmonic current and slightly amplify the 3rd harmonic current.

2. If the harmonics in the system cannot be ignored, the background harmonic content of the power supply system should be found out, and then the K value should be reasonably determined. In order to achieve the purpose of harmonic reduction, the reactance rate should be configured with an inductor comprehensive harmonic impedance at the capacitor connection point.

① When the background harmonics of the system power grid are 5 times or more, the reactance rate should be configured as (4.5~6)%. The overall situation of the power grid is: the 5th harmonic is the largest, the 7th harmonic is the second largest, and the 3rd harmonic is the smallest. Therefore, this project selected more reactors with k=4.5%~6%, which is commonly used internationally.

②The configuration of 6% reactor has a good effect on attenuating the 5th harmonic, but has a significant amplification effect on the 3rd harmonic. Its resonance point (204hz) is far away from the fifth harmonic frequency (250Hz), with a large margin.

③The 4.5% reactor is configured to slightly amplify the third harmonic. Therefore, it is appropriate to weaken the fifth and above harmonics while reducing the amplification of the third harmonic. However, the frequency distance between its resonance point (235hz) and the 5th harmonic is very small.