Selection of reactance rate of series reactor
Information sources：本站 | Release date：
2017-11-08
| Browse volume：99
The reactance rate refers to the rated capacity of the series reactor as a percentage of the rated capacity of the capacitor or the inductive reactance Xln of the series reactor accounts for the percentage of the capacitive reactance Xcn. The choice of the reactance rate depends on the harmonic background.
1. The background harmonic of the capacitor device access point is 3 times: 1) The 3rd harmonic content is small, and the series reactor of 0.1%~1% can be selected, but it should be checked whether the 3rd harmonic amplification after the capacitor device is put in the input Exceeding or close to the national standard limit, and have a certain margin; 2) 3rd harmonic content is large, has exceeded or close to the national standard limit, select 12% or 13% and 4.5% to 6% series reactor mixed Assume.
2. The background harmonic of the capacitor device access point is 3 times, 5 times: 1) The 3rd harmonic content is very small, and the 5th harmonic content is large (including the value exceeding or close to the national standard limit), and 4.5% is selected. 6% series reactor, avoid using 0.1% ~ 1% series reactor; 2) 3rd harmonic content is slightly larger, 5th harmonic content is smaller, select 0.1% ~ 1% series reactor, but fulfilled After the capacitor device is put into operation, the 3rd harmonic amplification exceeds or approaches the national standard limit, and has a certain margin; 3) The 3rd harmonic content is large, which has exceeded or is close to the national standard limit, and 12% or 12% is selected. 4.5% to 6% of series reactors are mixed and installed.
3. The background harmonic of the capacitor device access point is 5 times or more: 1) The 5th harmonic content is small, and the 4.5% to 6% series reactor should be selected; 2) The 5th harmonic content is large, should be Select a 4.5% series reactor.
4. For the series reactors of 0.1% to 1%, it is necessary to prevent serious amplification or resonance of the 5th and 7th harmonics; for the series reactors of 4.5% to 6%, it is necessary to prevent the 3rd harmonics. Severe amplification or resonance.
