CN202405075U - Single-phase transformer - Google Patents

Abstract

The utility model discloses a single-phase transformer which comprises an iron core main column, a first iron core side column and a second iron core side column, wherein a low-voltage coil, a medium-voltage coil and a high-voltage coil are sequentially sleeved on the iron core main column from inside to outside; an excitation oil and a voltage adjustment coil are sequentially sleeved on the first iron core side column from inside to outside; and the excitation coil is connected in parallel with the medium-voltage coil sleeved on the iron core main column to adjust the voltage of the voltage adjustment coil. By sleeving the voltage adjustment coil on the first iron core side column, the coil winding is convenient, the risk in manufacturing is reduced, the operation reliability of the transformer is improved, and the whole width of the transformer is effectively reduced.

Description

single phase transformer

technical field

The utility model relates to the field of transformers, in particular to a single-phase transformer.

Background technique

A transformer is a static electrical device that uses the principle of electromagnetic induction to convert AC power of one voltage into AC power of another voltage at the same frequency. The basic structure of a transformer is: two or more mutually insulated coils are set on a common iron core, and they are connected to each other through the coupling of the magnetic circuit. Under the action of an applied voltage, an alternating current flows through the primary coil, and an alternating magnetic flux is generated in the iron core. This alternating magnetic flux is simultaneously linked to the primary and secondary coils. According to the law of electromagnetic induction, it can be induced in the secondary coil. EMF. Thus, the secondary coil can supply power to the load, realizing energy conversion.

Fig. 1 is a schematic structural diagram of a transformer in the prior art. As shown in Figure 1, the iron core of the transformer is a single-phase three-column type, including the core main column 1, the iron core side column 2 and the iron core side column 3, above the core main column 1, the iron core side column 2 and the iron core side column 3 and An iron yoke 5 is also provided below, and a coil 4 is set on the main column 1 of the iron core to realize voltage transformation. The coil 4 may sequentially include a low voltage coil, a voltage regulating coil, a medium voltage coil and a high voltage coil from inside to outside.

FIG. 2 is a top view of the transformer shown in FIG. 1 . A low-voltage coil 11 , a voltage-regulating coil 12 , a medium-voltage coil 13 and a high-voltage coil 14 are sequentially arranged around the core main column 1 from inside to outside.

However, there are following defects in the prior art shown in Fig. 1 and Fig. 2:

1) Due to the requirement of impedance voltage, the voltage regulating coil 12 can only be placed within the medium voltage coil 13 and the high voltage coil 14, and the 32 coils of the voltage regulating coil 12 must pass through the end of the high voltage coil 14 to lead out. Since the terminal voltage of the high-voltage coil 14 is 220KV, it is easy to cause uneven distribution of the field intensity at the terminal when the head is passed through, resulting in a very low one-time pass test rate and poor operational reliability.

2) Since all the coils are fitted on the main column 1 of the iron core, the outer diameter of the high-voltage coil 14 will reach 3 meters, and winding is very difficult, and the guarantee rate of the radial and axial dimensions of the coils is low.

3) Since all the coils are mounted on the main column 1 of the iron core, the weight distribution of the transformer is too concentrated, resulting in a complex structure and a lot of materials used for the backing plate used for the transformer, which leads to waste of resources.

4) Since all the coils are mounted on the core main column 1, the iron core main column 1 takes up a large space, thereby increasing the overall width of the transformer, making transportation difficult and increasing transportation costs.

Utility model content

The technical problem to be solved by the utility model is to provide a single-phase transformer, thereby facilitating coil winding, reducing manufacturing risks, improving the operation reliability of the transformer, and effectively reducing the overall width of the transformer.

According to one aspect of the present invention, a single-phase transformer is provided, including: a core main post, a first iron core side post and a second iron core side post, wherein a low-voltage coil, a middle The pressure coil and the high voltage coil are sequentially fitted with an exciting coil and a voltage regulating coil on the side column of the first iron core from inside to outside. The exciting coil is connected in parallel with the medium voltage coil set on the main column of the iron core to adjust the voltage of the voltage regulating coil.

Preferably, the cross section of the main core column is circular, the cross sections of the first core side column and the second iron core side column are both elliptical, and the major axis of the ellipse is the same as the diameter of the circle.

Preferably, the area of the ellipse is larger than half of the area of the circle.

Preferably, the single-phase transformer further includes a cylindrical support frame sleeved on the side column of the first iron core, wherein the cylindrical support frame is provided with a through hole with an elliptical cross-section in the axial direction, and the exciting coil and the voltage regulating coil are composed of The inside and outside are sequentially set on the cylindrical support frame.

Preferably, the exciting coil and the voltage regulating coil are elliptical, and are sequentially fitted on the first iron core side column from inside to outside.

Preferably, cross-sections of the core main column, the first iron core side column and the second iron core side column are circular with the same diameter.

The utility model sets the excitation coil and the voltage regulating coil on a side column of the iron core of the single-phase transformer sequentially from the inside to the outside, and connects the excitation coil and the medium voltage coil set on the main column of the iron core in parallel to adjust the voltage of the voltage regulating coil . Therefore, coil winding is facilitated, manufacturing risks are reduced, operation reliability of the transformer is improved, and the overall width of the transformer is effectively reduced.

Description of drawings

FIG. 1 is a schematic structural diagram of a single-phase transformer in the prior art.

Fig. 2 is a top view of a single-phase transformer in the prior art.

Fig. 3 is a top view of an embodiment of the utility model single-phase transformer.

Fig. 4 is a top view of another embodiment of the single-phase transformer of the present invention.

Fig. 5 is a top view of another embodiment of the single-phase transformer of the present invention.

Detailed ways

The present invention will be described more fully below with reference to the accompanying drawings, in which exemplary embodiments of the present invention are illustrated.

The following is an example of a self-coupling oil-immersed 500KV single-phase transformer. Those skilled in the art can understand that the embodiments of the present invention are also applicable to other types of single-phase transformers.

Fig. 3 is a top view of an embodiment of the utility model single-phase transformer. As shown in FIG. 3 , compared with the prior art shown in FIG. 2 , the voltage regulating coil 12 is moved from the core main column 1 to the iron core side column 2 , and the excitation coil 21 is fitted inside the voltage regulating coil 12 . The excitation coil 21 is connected in parallel with the medium-voltage coil 13 set on the main column 1 of the iron core, so as to achieve the purpose of locking the magnetic flux of the side column 2 of the iron core and coupling to change the voltage of the voltage regulating coil 12 .

Based on the single-phase transformer shown in the above-mentioned embodiment of the utility model, the exciting coil and the voltage regulating coil are sequentially set on a side column of the iron core of the single-phase transformer from the inside to the outside, and the exciting coil and the middle column set on the main column of the iron core The voltage coil is connected in parallel to adjust the voltage of the voltage regulating coil. Therefore, coil winding is facilitated, manufacturing risks are reduced, operation reliability of the transformer is improved, and the overall width of the transformer is effectively reduced.

For transformers with the same parameters, the embodiment shown in Figure 3 has the following advantages compared with the prior art shown in Figure 2:

1) By installing the voltage regulating coil on the side column of the iron core, the problem of uneven distribution of the electric field and easy partial discharge caused by the complexity of the lead-out line is solved, and the pass rate of the one-time test of the product is greatly improved.

2) The width of the transformer can be reduced by 9%, which is convenient for transportation.

3) Simplify the coil winding process and reduce the cost.

According to another specific embodiment of the present invention, the cross sections of the core main column 1 , the first iron core side column 2 and the second iron core side column 3 are circular with the same diameter.

Since the cross section of the first iron core side column 2 is circular, the circular excitation coil 21 and voltage regulating coil 12 can be directly sleeved on the first iron core side column 2 from inside to outside in sequence.

Fig. 4 is a top view of another embodiment of the single-phase transformer of the present invention. As shown in Figure 4, compared with the embodiment shown in Figure 3, the cross-sections of the first iron core side column 2 and the second iron core side column 3 are elliptical, and the major axis of the ellipse is in line with the circle of the iron core main column 1 The diameters of the cross-sections are the same size.

By changing the cross section of the first iron core side column 2 and the second iron core side column 3 from circular to elliptical, the iron yoke in the transformer can be shortened, the use of silicon steel sheets in the iron core can be reduced, and the no-load loss can be effectively reduced and load loss. At the same time, by ensuring that the major axis of the ellipse is the same as the diameter of the circle, the loss of magnetic flux can be effectively avoided.

According to a specific embodiment of the present invention, the area of the elliptical cross section of the first iron core side column 2 and the second iron core side column 3 is larger than half of the circular cross section area of the main iron core column 1 . Preferably, the elliptical cross-sectional area of the first core side leg 2 and the second iron core side leg 3 is 53% of the circular cross-sectional area of the main core leg 1 .

As shown in Figure 4, in order to be able to set the voltage regulation coil 12 and the exciting coil 21 on the first iron core side column 2 with an elliptical cross section, a cylindrical support frame 22 can be added to the first iron core side column 2, It is used to be set on the side column of the first iron core. The cylindrical support frame 22 is provided with a through hole with an elliptical cross-section in the axial direction, so as to be able to fit on the first iron core side column 2 . The exciting coil 21 and the voltage regulating coil 12 are sequentially set on the cylindrical support frame from inside to outside.

By changing the cross-section of the side column of the iron core from circular to elliptical, the weight of the transformer itself can be effectively reduced by more than 1% without affecting the performance of the transformer, thereby effectively reducing the cost.

Fig. 5 is a top view of another embodiment of the single-phase transformer of the present invention. Compared with the embodiment shown in FIG. 4 , in the embodiment shown in FIG. 5 , instead of using a support frame, the voltage regulation coil 12 and the excitation coil 21 are directly made into an ellipse shape, and are connected on the first outer shell from the inside to the outside. On the side post 2 of the iron core.

By making the voltage regulating coil 12 and the excitation coil 21 into an ellipse shape, the no-load loss of the transformer can be effectively reduced, the noise of the transformer can be reduced, and the mechanical strength of the transformer can also be increased.

In this embodiment, the existing four-center method can be used to make an elliptical winding mold, and the elliptical exciting coil 21 and voltage regulating coil 12 are wound out, and the exciting coil 21 and voltage regulating coil 12 are directly connected in sequence according to the conventional package form. Set on the first iron core side column 2 whose cross section is oval. Therefore, under the premise of ensuring the electrical insulation distance, the center distance of the core, the length of the oil tank, and the length of the electromagnetic wire for the coil are greatly reduced, thereby greatly reducing the consumption of silicon steel sheets, electromagnetic wires, transformer oil, and steel.

For transformers with the same parameters, compared with the embodiment shown in Figure 4, the embodiment shown in Figure 5 can further reduce costs while ensuring safety performance, saving 0.5 tons of copper, 2.7 tons of silicon steel sheets, and 6.2 tons of transformer oil , 2.2 tons of steel, compared with the embodiment shown in Figure 4, the cost can be reduced by 3.7%.

The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and changes will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principle and practical application of the invention, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for particular purposes.

Claims (6)

1. single-phase transformer; It is characterized in that; Comprise: principal post unshakable in one's determination, first iron core side pole and second iron core side pole, wherein on principal post unshakable in one's determination, be set with low-voltage coil, intermediate voltage winding and high-tension coil from inside to outside successively, on first iron core side pole, be set with magnet exciting coil and voltage regulation coil from inside to outside successively; Magnet exciting coil is parallelly connected with the intermediate voltage winding on being sleeved on principal post unshakable in one's determination, to regulate the voltage of voltage regulation coil.

2. single-phase transformer according to claim 1; It is characterized in that; The cross section of said principal post unshakable in one's determination is circular, and the cross section of said first iron core side pole and second iron core side pole is ellipse, and said oval-shaped major axis is identical with the diameter of said circle.

3. single-phase transformer according to claim 2 is characterized in that, said oval-shaped area is half the greater than said circular area.

4. according to claim 2 or 3 described single-phase transformers; It is characterized in that; Single-phase transformer also comprises the cylindrical support frame that is sleeved on first iron core side pole; Wherein to be provided with cross section be oval-shaped through hole to cylindrical support frame axial direction, and magnet exciting coil and voltage regulation coil are sleeved on the cylindrical support frame from inside to outside successively.

5. according to claim 2 or 3 described single-phase transformers, it is characterized in that magnet exciting coil and voltage regulation coil are oval, are sleeved on successively on first iron core side pole from inside to outside.

6. single-phase transformer according to claim 1 is characterized in that, the cross section of said principal post unshakable in one's determination, first iron core side pole and second iron core side pole is the identical circle of diameter.

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