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Selection of reactor reactance rate. | Shanghai Wenda
  • Source: gregbolt.com
  • Views: 15
  • Date: 2020-01-08

Selection of reactor reactance rate:

The background harmonic at the compensation device access is 3rd order

When the background harmonics connected to the power grid are 3rd order and above, it is generally 12%; two reactance rates of 4.5% to 6% and 12% can also be used. You can also choose a zero-sequence filter reactor when only 3rd-order zero-sequence harmonics do not require compensation.

The third harmonic content is small, and a 0.1% to 1% series reactor can be selected, but it should be checked whether the third harmonic amplification after the capacitor device is put in exceeds or approaches the national standard limit, and there is a certain margin.

The third harmonic content is relatively large and has already exceeded or approached the national standard limit, which is generally 12%. It can also be installed with a series reactor with two reactance rates of 4.5% to 6% and 12%.

The background harmonics at the access of the compensation device are 3rd and 5th

The third-order harmonic content is small, and the fifth-order harmonic content is large (including that it has exceeded or approached the national standard limit). Select a series reactor of 4.5% to 6%, and avoid using a series reactor of 0.1% to 1%.

The 3rd harmonic content is slightly larger, and the 5th harmonic content is smaller. Select a series reactor of 0.1% to 1%, but it should be checked whether the 3rd harmonic amplification exceeds or approaches the national standard limit after the capacitor device is put in, and there are certain Margin.

The third harmonic content is relatively large, and has already exceeded or approached the national standard limit. Choose 12% or 12% and 4.5% to 6% series reactors for mixed installation.

、轧机、工业炉、单晶炉等大部分工业负荷为此类负荷) The background harmonics at the access of the compensation device are 5th, 7th, and above ( most industrial loads such as intermediate frequency smelting, electroplating , rolling mills, industrial furnaces, single crystal furnaces are such loads)

The 5th harmonic content is small, and 4.5% to 6% series reactors should be selected. The 5th harmonic content is large, and a 4.5% series reactor should be selected.

For the use of 0.1% to 1% series reactors, it is necessary to prevent the 5th and 7th harmonics from being severely amplified or resonant; for the use of 4.5% to 6% series reactors, it is necessary to prevent the 3rd harmonics from being severely amplified or resonant. Or resonance.

The characteristic background of the access point of the compensation device seriously exceeds the national standard limit. The harmonic control to meet the national standard requires the filtering design by professional technicians and special customized filter reactance. The load capacity of other filter components is equivalent to that of the distribution transformer. When selecting a parallel type reactive power compensation and harmonic control device. When the load capacity is much smaller than the distribution transformer, a series reactive power compensation and harmonic control device is selected.

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