CN205039037U - Three post interphase reactor of three -phase - Google Patents

Abstract

The utility model discloses a three-phase three-column balanced reactor, comprising upper and lower iron yokes and A-phase core columns, B-phase core columns, C-phase core columns and The A-phase coil, B-phase coil, and C-phase coil wound on the A-phase stem, B-phase stem, and C-phase stem are characterized in that the height of the B-phase stem is smaller than the A-phase stem , the height of the C-phase stem and the height of the A-phase stem is equal to the height of the C-phase stem. Compared with the prior art, the utility model has the following advantages: the phase B sensing value is very close to the other two sensing values, the sensing value unbalance rate is normally less than 2%, and the total manufacturing cost is reduced by 5%.

Description

A three-phase three-column balance reactor

technical field

The utility model relates to a three-phase AC reactor used in an AC filtering system, in particular to a three-phase three-column balanced reactor.

Background technique

The three-phase reactor currently used in the market is a three-column type and the three-phase iron core has the same cross-sectional area (see Figure 1). The advantage of this structure is that the structure and process are simple, and the disadvantage is that the performance is poor. Increased manufacturing costs are high. This is because the three-phase magnetic circuit is unbalanced and the three-phase inductance unbalance rate is more than 5%, and the tolerance of each phase inductance is ±5%. If the two are subtracted, the tolerance left for the process and materials is less than ±3%, the consistency of the material is generally ±2%, and the remaining tolerance for the process is less than ±1%, so the one-time pass rate of this series of products is very low (generally not 50%), which means It means that the manufacturing cost is much higher than that of other products (the pass rate is above 90%). Let’s analyze it through the technical principle:

Among the performance parameters of the reactor, the most important is the inductance, and the calculation formula of the inductance is as follows;

$\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 0.4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;N</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}}{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}}{\mathrm{<span\; class="notranslate">\; \&mu;</span>}<span\; class="notranslate">\; ~</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 8</span>}}$

Where L - inductance (H);

μ～——core AC magnetic permeability;

N - the number of turns of the coil;

S _c ——core effective sectional area (cm ² );

l _c ——core average magnetic path length (cm).

l _R ——The length of the non-magnetic air gap in the core magnetic circuit (cm).

It can be seen from the formula that the parameters that affect the inductance are the number of turns, air gap, core area and magnetic circuit length. In an ordinary three-phase three-column reactor, the number of turns, air gap and core area of the three phases are all The same, except that the length of the magnetic circuit is different. See Figure 2. It can be seen from Figure 2 that the equivalent magnetic circuit length of phase A is equal to the equivalent magnetic circuit length of phase C, and the equivalent magnetic circuit length of phase B is equal to that of phase A and phase C. Phase parallel connection, that is, only half of phase A or phase C. Through calculation and verification, the inductance of phase A and phase C is about 0.9 times that of phase B, so if you want the three-phase balance rate to be as close as possible, you need to reduce the inductance of phase B. According to the formula, we can Increase the air gap thickness (lg) of phase B to reduce the inductance of phase B, but if only the air gap thickness of phase B is increased, the height of the three phases will be inconsistent, which will lead to adverse problems such as size, appearance, and noise.

Utility model content

The technical problem to be solved by the utility model is to provide a three-phase three-column balanced reactor aiming at many problems existing in the prior art, which can reduce the inductance unbalance rate of the three-phase reactor and at the same time reduce the production cost.

The technical problem to be solved by the utility model can be realized through the following technical solutions:

A three-phase three-column balanced reactor, including upper and lower iron yokes and A-phase core columns, B-phase core columns, and C-phase core columns installed between the upper and lower iron yokes, and respectively wound on the A-phase core column, B-phase core column, A-phase coil, B-phase coil, and C-phase coil on the C-phase core column, it is characterized in that, the height of the B-phase core column is smaller than the A-phase core column and the C-phase core column and the height of phase A core column is equal to the height of phase C core column.

In a preferred embodiment of the present utility model, the height of the phase B stem is 90% of the height of the phase A stem and the height of the phase C stem.

In a preferred embodiment of the present utility model, air gap plates are arranged between the upper and lower iron yokes and the phase A stem, phase B stem, and phase C stem.

Compared with the prior art, the utility model has the following advantages: the phase B sensing value is very close to the other two sensing values, the sensing value unbalance rate is normally less than 2%, and the total manufacturing cost is reduced by 5%.

Description of drawings

Fig. 1 is a schematic structural diagram of an existing three-phase reactor.

Fig. 2 is a schematic diagram of the magnetic principle of an existing three-phase reactor.

Fig. 3 is a structural schematic diagram of a three-phase three-column balanced reactor of the present invention.

detailed description

The three-phase reactor in Fig. 1 includes upper and lower iron yokes 1, 2 and A-phase stem 3, B-phase stem 4, C-phase stem 5 installed between the upper and lower iron yokes 1, 2 and Phase A coil 6 , phase B coil 7 , and phase C coil 8 are respectively wound on phase A stem 3 , phase B stem 4 , and phase C stem 5 . Air gap plates 9 , 10 , 11 , 12 , 13 , 14 are arranged between the upper and lower iron yokes 1 , 2 and the A-phase stem 3 , B-phase stem 4 , and C-phase stem 5 .

Referring to Fig. 3, the three-phase three-column balanced reactor of the present invention includes upper and lower iron yokes 100, 200 and A-phase stems 300 and B-phase stems 400 installed between the upper and lower iron yokes 100, 200 , C-phase stem 500, and A-phase coil 310, B-phase coil 410, C-phase coil 510 and B-phase stem 400 respectively wound on A-phase stem 300, B-phase stem 400, and C-phase stem 500 The height is less than the height of the A-phase stem 300 and the C-phase stem 500, and the height of the A-phase stem 300 is equal to the height of the C-phase stem 500. Preferably, the height of the phase B stem is 90% of the height of the phase A stem and the height of the phase C stem. Air gap plates 320 , 330 , 420 , 430 , 520 , 530 are arranged between the upper and lower iron yokes 100 , 200 and the A-phase stem 300 , B-phase stem 400 , and C-phase stem 500 .

The air gap plates 320, 330, 420, 430, 520, 530 are made of insulating material, the thickness of the air gap plates 320, 520 is equal, the thickness of the air gap plates 330, 430, 530 is equal, and the thickness of the air gap plate 420 is thicker than that of the air gap plates. The thickness of the gap plate 320,520.

Claims (3)

1. A three-phase three-column balanced reactor, comprising upper and lower iron yokes and A-phase stems, B-phase stems, and C-phase stems installed between the upper and lower iron yokes, and are respectively wound on The phase A coil, phase B coil, and phase C coil on the phase A core column, phase B core column, and phase C core column are characterized in that the height of the phase B core column is less than that of the phase A core column and the phase C core column. The height of the stem and the height of the phase A stem is equal to the height of the phase C stem. 2. The three-phase three-column balanced reactor according to claim 1, wherein the height of the B-phase stem is 90% of the height of the A-phase stem and the C-phase stem. 3. The three-phase three-column balanced reactor according to claim 1 or 2, wherein the upper and lower iron yokes and the A-phase stem, B-phase stem, and C-phase stem are equally An air gap plate is provided.