CN203242471U - Valve side winding wire outgoing structure of convertor transformer - Google Patents

Abstract

The utility model relates to a valve-side winding outlet structure of a converter transformer. Each group of valve-side windings is composed of three coils. The plane where the central axes of the three coils are located is the central plane. There are wire outlets on both sides of the coil, and the wire outlets include the coil head, middle tap and tail. The utility model has the advantages of good electrical safety and operation reliability.

Description

Outlet structure of the valve side winding of the converter transformer

technical field

The utility model relates to a variable current transformer, in particular to a valve-side winding outlet structure of the variable current transformer used in a high-voltage frequency conversion speed regulation system.

Background technique

The valve side windings of the input side converter transformer of the cascaded high-voltage variable frequency speed regulation system adopt a multi-split phase-shifting structure, and there is a phase difference between the valve side windings. The windings on each valve side supply power to the corresponding power units respectively, and the rectification and inversion are completed in these units, and then superimposed to realize the multiple input technology, which can eliminate the pollution of harmonics to the power grid. Due to the characteristics of this technology, the cascaded high-voltage frequency conversion technology has been widely used in China, the market scale has continued to expand, and the demand for supporting converter transformers has grown rapidly.

In the cascaded high-voltage variable frequency speed regulation system, the number of power unit series series is selected according to the rated output voltage, and the number of power unit series series for each phase output determines the number of split groups of the valve side winding of the converter transformer used on the input side. For example, if the number of power units in series is 8, each phase on the secondary side of the converter transformer needs to be split into 24 valve-side windings; the valve-side windings can be equivalent to 72-pulse rectification after phase-shifting using the Yanbian delta connection method. . Due to the fact that the valve-side winding of the converter transformer is split into multiple windings and adopts the characteristics of the extended-edge delta connection method, it determines that there are many outlets, lead-out lines and phase-to-phase connections of the valve-side winding. There are at least 216, corresponding to 72 lead-out lines of the valve side windings, 24 inter-phase lines across phases, and 48 inter-phase lines between adjacent phases. Therefore, how to arrange so many lead-out lines and inter-phase lines in space is quite complicated. The problem.

As shown in Fig. 1, Fig. 2 and Fig. 3, it is the outgoing line structure of the valve side winding 100 of the converter transformer in the common high-voltage frequency conversion speed regulation system, and its lead-out line 11 is connected to the adjacent phase-to-phase line 12, and the cross-phase to phase-to-phase line 13 Arranged on the same side of the transformer, that is, the same side of the central plane 200 (see Figure 3), from the overall point of view, that is, the outlet 10 is located on the same side of the valve side winding, this outlet structure will lead to too compact space arrangement, which may cause transformer The lead-out line 11 crosses the phase-to-phase connection line 13 (see Figure 3), and the insulation distance is too small.

Utility model content

The purpose of this utility model is to propose a valve-side winding outlet structure of a converter transformer, which can solve the problems of small insulation distance and possible crossing between leads.

In order to achieve the above object, the technical scheme adopted in the utility model is as follows:

The valve-side winding outlet structure of the converter transformer, each group of valve-side windings is composed of three coils, the plane where the central axes of the three coils are common is the central plane, and the two sides of the central plane of each group of valve-side windings Each has a wire outlet, and the wire outlet includes a coil head, a middle tap and a tail.

Preferably, the three coils are respectively recorded as a-phase coil, b-phase coil, and c-phase coil; the head and middle tap of the a-phase coil, the head, middle tap, and tail of the b-phase coil, and the tail of the c-phase coil Both the head and the head are located on the same side of the center plane, and the tail of the a-phase coil and the middle tap of the c-phase coil are located on the other side of the center plane.

Preferably, the three coils are respectively recorded as a-phase coil, b-phase coil, and c-phase coil; the head and tail of the a-phase coil, the head, middle tap, and tail of the b-phase coil, and the middle of the c-phase coil Both the tap and the head are located on the same side of the central plane, and the middle tap of the a-phase coil and the tail of the c-phase coil are located on the other side of the central plane.

Preferably, the b-phase coil is located between the a-phase coil and the c-phase coil.

The utility model has the following beneficial effects:

By adjusting the position of the outlet wires of the valve side windings of the converter transformer, the phase-to-phase connection lines and the interphase connection lines of adjacent phases are respectively arranged on both sides of the center plane. The inter-phase connection makes the space between the inter-phase connection and each lead-out line more sparse, and the structure is better, which is conducive to improving the production efficiency in the manufacturing process and the electrical strength of the product, electrical safety and operational reliability. Even better, the shape of the entire transformer is also more symmetrical and beautiful.

Due to the adoption of the above structure, space crossing can be avoided between the phase-to-phase connection lines of the converter transformer and the lead-out lines of the valve side winding, and the arrangement is more sparse.

Description of drawings

Fig. 1 is a lateral schematic diagram of a valve-side winding outlet structure of a converter transformer in the prior art;

Fig. 2 is a lateral schematic diagram of another valve-side winding outlet structure of a converter transformer in the prior art;

Fig. 3 is a schematic diagram of the connection of one group of valve side windings of the valve side winding outlet structure of the prior art converter transformer;

Fig. 4 is a lateral schematic diagram of the outlet structure of the valve side winding of the converter transformer according to Embodiment 1 and Embodiment 2 of the utility model;

Fig. 5 is a schematic diagram of the connection of one group of valve side windings in the outlet structure of the valve side windings of the converter transformer according to Embodiment 1 of the present utility model;

Fig. 6 is a schematic diagram of connection of one group of valve side windings in the outlet structure of the valve side windings of the converter transformer according to the second embodiment of the present invention.

Reference signs: 1, a-phase coil; 101, head; 102, middle tap; 103, tail; 2, b-phase coil; 201, head; 202, middle tap; 203, tail; 3, c-phase Coil; 301, head; 302, middle tap; 303, tail; 4, connection between adjacent phases; 5, connection between adjacent phases; 6, cross-phase connection; 200, center plane; 300, valve side Winding; 30, outlet head.

Detailed ways

Below, the utility model will be further described in conjunction with the accompanying drawings and specific embodiments.

Embodiment one

As shown in Figure 4 and Figure 5, the outlet structure of the valve side windings of the converter transformer, each group of valve side windings 300 is composed of three coils, and the plane where the central axes of the three coils are common is the central plane 200 (plane Indicated by the center line in the view), each group of valve-side windings has outlets 30 on both sides of the center plane 200, and the outlets 30 include the coil head, middle tap and tail.

For the simplicity of the diagram, a group of valve-side windings 300 that supply power to the same three-phase rectifier bridge in the high-voltage frequency conversion speed regulation system are selected for illustration. The turns are called phase-shifted turns, and the turns between the middle tap and tail of the coil are called basic turns. The three coils are referred to as a-phase coil 1 , b-phase coil 2 , and c-phase coil 3 , respectively. When the center tap 102 of the a-phase coil 1 and the head 101 are located on the same side of the central plane 200, the center tap 102 is on the right relative to the head 101 of the a-phase coil 1, and the tail 103 of the a-phase coil 1 is on the right side. On the other side of the central plane 200, its phase-shifted turns are almost full turns from a spatial understanding, and its basic turns will not be a full turn from a spatial understanding. At this time, all outlets of the b-phase coil 2 (that is, the first head 201, the middle tap 202, tail 203) are located on the same side of the central plane 200, relative to the head 201 of the b-phase coil 2, the middle tap 202 is on the right, and the tail 203 is on the left, and the phase-shifting turns and the basic turns are understood in terms of space. Almost a full turn, the tail 303 of the c-phase coil 3 and the head 301 are located on the same side of the central plane 200, relative to the head 301 of the c-phase coil, the tail 303 is on the left, and the middle tap 302 of the c-phase valve coil is Located on the other side of the central plane 200, its phase-shifted turns and basic turns are not full turns from a spatial understanding; when the interphase wiring is subsequently assembled, the center tap 102 of the a-phase coil 1 and the tail 203 of the b-phase coil pass through The connection line 4 between adjacent phases is connected, the middle tap 202 of the b-phase coil 2 is connected with the tail end 303 of the c-phase coil 3 through the connection line 5 between adjacent phases, the middle tap 302 of the c-phase coil 3 is connected with the tail end 303 of the a-phase coil 1 103 is connected through the phase-to-phase connection line 6.

Among them, the b-phase coil 2 is located between the a-phase coil 1 and the c-phase coil 3 . The head 101 and the middle tap 102 of the a-phase coil 1, the head 201, the middle tap 202 and the tail 203 of the b-phase coil 2, and the tail 303 and the head 301 of the c-phase coil 3 are all located on the same plane of the central plane 200. On the other side of the central plane 200 , the tail 103 of the a-phase coil 1 and the center tap 302 of the c-phase coil 3 are located on the other side of the central plane 200 .

Embodiment two

As shown in FIG. 4 and FIG. 6 , the difference between this embodiment and the first embodiment lies in the way of connecting the windings on the valve side. Specifically, when the tail 103 and the head 101 of the a-phase coil 1 are located on the same side of the central plane 200, the tail 103 is on the right relative to the head 101 of the a-phase coil 1, and the middle tap of the a-phase coil 1 102 is located on the other side of the central plane 200, and its phase-shifted turns and basic turns are not full turns from the spatial understanding. At this time, all outlets of the b-phase coil 2 (that is, the head 201, the middle tap 202, and the tail 203 ) are located on the same side of the central plane 200, relative to the head 201 of the b-phase coil 2, the middle tap 202 is on the left, and the tail 203 is on the right, and the phase-shifting turns and basic turns are almost full turns from the spatial understanding, c The center tap 302 of the phase coil 3 is located on the same side of the center plane 200 as the head 301, and the center tap 302 is on the left relative to the head 301 of the c-phase coil 3, while the tail 303 of the c-phase coil 3 is located on the center plane 200 On the other side, the phase-shifted turn is almost a full turn from the spatial understanding, and its basic turn will not be a full turn from the spatial understanding; when the subsequent phase-to-phase wiring assembly is performed, the tail 103 of the a-phase coil 1 and the b-phase coil 2 The middle tap 202 of phase b is connected through the connecting line 4 between adjacent phases, the tail 203 of the b-phase coil 2 is connected with the middle tap 302 of the c-phase coil 3 through the connecting line 5 between adjacent phases, the tail 303 of the c-phase coil 3 is connected with the phase a The middle tap 102 of the coil 1 is connected through the cross-phase interphase connection 6 .

Wherein, the head 101 and the tail 103 of the a-phase coil 1, the head 201, the middle tap 202 and the tail 203 of the b-phase coil 2, and the middle tap 302 and the head 301 of the c-phase coil 3 are all located in the central plane 200 The middle tap 102 of the a-phase coil 1 and the tail 303 of the c-phase coil 3 are located on the other side of the central plane 200 .

It can be seen that no matter which of the above two embodiments is adopted in practical applications, by adjusting the position of the outlet of the valve side winding of the converter transformer, the inter-phase connection lines across phases and the inter-phase connection lines of adjacent phases can be arranged separately. On both sides of the center line, at the same time, the lead-out line of the valve side winding (that is, the coil head) and the phase-to-phase connection line of the adjacent phase are arranged reasonably, making the space between the phase-to-phase connection line and each lead-out line more sparse. Comparing Fig. 3, Fig. 5, and Fig. 6, it can be seen that possible spatial intersections can also be effectively avoided. The structure of the utility model is better in manufacturability. For example, the operation surface becomes two sides during interphase connection assembly, and the distance between the lines is looser, and the operation space is more open, which is beneficial to improve the production in the manufacturing process. The efficiency and the electric strength of the product are better, the electrical safety and operation reliability are better, and the shape of the whole transformer is more symmetrical and beautiful.

For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and ideas described above, and all these changes and modifications should fall within the protection scope of the claims of the present invention .

Claims (4)

1. The valve-side winding outlet structure of the converter transformer is characterized in that each group of valve-side windings is composed of three coils, the plane where the central axes of the three coils is located is the central plane, and the center of each group of valve-side windings There are wire outlets on both sides of the plane, and the wire outlets include the coil head, middle tap and tail. 2. the valve side winding outlet structure of the converter transformer as claimed in claim 1, is characterized in that, three coils are respectively marked as a phase coil, b phase coil, c phase coil; , the head, middle tap and tail of the b-phase coil, and the tail and head of the c-phase coil are all located on the same side of the center plane, and the tail of the a-phase coil and the middle tap of the c-phase coil are all located on the same side of the center plane The other side. 3. The valve-side winding outlet structure of the converter transformer as claimed in claim 1, wherein the three coils are respectively marked as a-phase coil, b-phase coil, and c-phase coil; the head and tail of the a-phase coil , the head, middle tap and tail of the b-phase coil, and the middle tap and the head of the c-phase coil are located on the same side of the center plane, and the middle tap of the a-phase coil and the tail of the c-phase coil are all located on the center plane The other side. 4. The valve-side winding outlet structure of the converter transformer according to claim 2 or 3, wherein the b-phase coil is located between the a-phase coil and the c-phase coil.

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