Longitudinal sectional type high-voltage coil of 27.5 kV oil-immersed transformer for railway station

Abstract

The utility model discloses a longitudinal sectional type high-voltage coil of a 27.5 kV oil-immersed transformer for a railway. The longitudinal sectional type high-voltage coil comprises a first winding section and a second winding section, a first coil ring is formed after the first winding section is wound, a second coil ring is formed after the second winding section is wound, the first coil ring is installed above the second coil ring, and the first coil ring and the second coil ring are isolated through a middle insulation isolation mechanism; the first winding section is wound by 21 layers, a first half oil duct is formed between the seventh layer and the eighth layer of the first winding section, one end of the first winding section is an A-phase wire inlet end, the other end of the first winding section is an X2-phase wire outlet end, winding is conducted from the A-phase wire inlet end to the X2-phase wire outlet end in the first winding section from inside to outside, and an X4-phase wire outlet end is led out from the middle of the nineteenth layer in the first winding section. According to the longitudinal sectional type high-voltage coil of the 27.5 kV oil-immersed transformer for the railway, the problem that in the prior art, due to the fact that the second winding section is wound outside the first winding section, the N3-phase wire outlet end and the N2-phase wire outlet end interfere with each other is solved.

Description

Technical Field

[0001] The utility model relates to a transformer, in particular to a longitudinally segmented high-voltage coil of a 27.5kV oil-immersed transformer used for railways. Background Art

[0002] As Figure 1 shown, in the prior art, the longitudinally segmented high-voltage coil of a 27.5kV oil-immersed transformer used for railways includes: a first winding segment and a second winding segment. One end of the first winding segment is the M-phase incoming line end, and the other end of the second winding segment is the N2-phase outgoing line end. The first winding segment is wound from the M-phase incoming line end to the N2-phase outgoing line end from the inside to the outside, and the first winding segment is wound for 18 layers; one end of the second winding segment is the N3-phase outgoing line end, and the other end of the second winding segment is the N-phase incoming line end. The second winding segment is wound from the N3-phase outgoing line end to the N-phase incoming line end from the inside to the outside, and the second winding segment is wound from the 18th layer to the 19th layer of the first winding segment, that is, the first winding segment and the second winding segment are wound for a total of 19 layers. The N4-phase outgoing line end is led out from the middle of the 17th layer of the first winding segment, and the N5-phase outgoing line end is led out from the middle of the second winding segment.

[0003] In the above longitudinally segmented high-voltage coil of a 27.5kV oil-immersed transformer used for railways, although the power is supplied through two incoming line ends, namely the M-phase incoming line end and the N-phase incoming line end, and the voltage regulation is also achieved by selectively connecting the N2-phase outgoing line end, the N3-phase outgoing line end, the N4-phase outgoing line end, and the N5-phase outgoing line end, the longitudinally segmented high-voltage coil of the 27.5kV oil-immersed transformer used for railways still has the following disadvantages: Since the second winding segment is wound from the N3-phase outgoing line end to the N-phase incoming line end from the inside to the outside, and the second winding segment is wound outside the first winding segment, the N3-phase outgoing line end and the N2-phase outgoing line end are located at the same layer of the coil, the N3-phase outgoing line end and the N2-phase outgoing line end are very close, and there is not much insulating material between the N3-phase outgoing line end and the N2-phase outgoing line end, resulting in interference and mutual influence between the N3-phase outgoing line end and the N2-phase outgoing line end. Summary of the Utility Model

[0004] The utility model aims to provide a longitudinally segmented high-voltage coil of a 27.5kV oil-immersed transformer used for railways, which solves the problem of mutual interference between the N3-phase outgoing line end and the N2-phase outgoing line end caused by the second winding segment being wound outside the first winding segment in the prior art.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The utility model discloses a longitudinally segmented high-voltage coil of a 27.5 kV oil-immersed transformer for railways, comprising: a first winding segment and a second winding segment; the first winding segment forms a first coil ring after winding, and the second winding segment forms a second coil ring after winding. The first coil ring is installed above the second coil ring, and the first coil ring and the second coil ring are isolated by an intermediate insulation isolation mechanism; the first winding segment is wound 21 layers, and a first half oil duct is formed between the 7th layer and the 8th layer of the first winding segment. One end of the first winding segment is the A-phase incoming line end, and the other end of the first winding segment is the X2-phase outgoing line end. From the A-phase incoming line end to the X2-phase outgoing line end in the first winding segment, it is wound from the inside to the outside, and the X4-phase outgoing line end is led out from the middle of the 19th layer of the first winding segment; the second winding segment is wound 21 layers, and a second half oil duct is formed between the 7th layer and the 8th layer of the second winding segment. One end of the second winding segment is the X-phase incoming line end, and the other end of the second winding segment is the X3-phase outgoing line end. From the X-phase incoming line end to the X3-phase outgoing line end in the second winding segment, it is wound from the inside to the outside, and the X5-phase outgoing line end is led out from the middle of the 19th layer of the second winding segment.

[0007] Preferably, except for the 8th layer, the layout of the first 20 layers in the first winding segment and the second winding segment is as follows: from the 2nd layer to the 20th layer, each layer includes: a front half segment and a rear half segment. The interval distance from the front half segment to the upper layer is d1, and the interval distance from the rear half segment to the upper layer is d2. The difference between d1 and d2 is △d, and the absolute value of △d is 2 mm; and the intervals between the 1st layer and the 7th layer and between the 8th layer and the 20th layer both satisfy the following condition: the interval difference △d between the upper adjacent two layers + the interval difference △d between the lower adjacent two layers = 0.

[0008] Preferably, the interval between the 2nd layer and the 1st layer: d1 = 5 mm, d2 = 7 mm; the adjacent intervals between the 2nd layer and the 7th layer or between the 8th layer and the 20th layer: d1 = 6 mm or 4 mm, d2 = 4 mm or 6 mm.

[0009] Preferably, the spacing between the 21st layer and the 20th layer is 7 mm.

[0010] Preferably, the outermost layers of the first winding segment and the second winding segment are both provided with insulation isolation rings. The insulation isolation ring includes: a dotting paper layer and a tightening belt layer. The dotting paper layer surrounds the outermost layer of the corresponding first winding segment or second winding segment, and the tightening belt layer is wound outside the dotting paper layer.

[0011] Preferably, the dotting paper layer has three layers.

[0012] Preferably, the A-phase incoming line end is connected with a first static screen lead wire, and the A-phase incoming line end and the first static screen lead wire are led out from one end of the first winding segment; the X-phase incoming line end is connected with a second static screen lead wire, and the X-phase incoming line end and the second static screen lead wire are led out from one end of the second winding segment.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1) In this application, the original winding method is completely changed. Although the coil is also divided into two sections in the prior art, the winding methods are different. In the prior art, the two ends are directly wound around the inner layer through the outer layer, while in this application, the two line segments are respectively wound into columnar structures and then overlapped and placed together, fully isolating the outgoing line ends of the X2 phase and the X3 phase from the incoming line end of the X phase, that is, increasing the distance between the outgoing line ends of the X2 phase and the X3 phase and the incoming line end of the X phase, avoiding the interference of the incoming line end of the X phase on the outgoing line ends of the X2 phase and the X3 phase, and making the output of the outgoing line ends of the X2 phase and the X3 phase more stable.

[0015] 2) At the same time, one or both of the incoming line end of the X phase and the incoming line end of the A phase can be selected to be connected, and the outgoing line ends of the X2 phase, the X3 phase, the X4 phase and the X5 phase can be selected to be connected, and then the output voltage can be adjusted. The winding from the incoming line end of the X phase to the outgoing line end of the X5 phase is the first winding group, and the winding from the incoming line end of the A phase to the outgoing line end of the X4 phase is the second winding group. The winding methods of the first winding group and the second winding group are exactly the same, which is more convenient to select the two incoming line ends and the outgoing line ends according to the required voltage and to adjust the voltage.

[0016] Other advantages, objectives and features of the utility model will be partially reflected by the following description, and partially will be understood by those skilled in the art through the research and practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is the circuit diagram of the longitudinally segmented high-voltage coil of the 27.5 kV oil-immersed transformer used in railways in the prior art.

[0018] Figure 2 FIG. is the circuit diagram of the longitudinally segmented high-voltage coil of the 27.5 kV oil-immersed transformer used in railways in this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the technical means, creative features, achieved objectives and functions of the utility model clearer and easier to understand, the following further elaborates the utility model in conjunction with the drawings and specific embodiments:

[0020] Such as Figure 2As shown in the figure, the utility model discloses a longitudinally segmented high-voltage coil of a 27.5 kV oil-immersed transformer for railways, which comprises: a first winding segment and a second winding segment; the first winding segment forms a first coil ring after winding, and the second winding segment forms a second coil ring after winding. The first coil ring is installed above the second coil ring, and the first coil ring and the second coil ring are isolated by an intermediate insulation isolation mechanism; the first winding segment is wound 21 layers, and a first half oil duct is formed between the 7th layer and the 8th layer of the first winding segment. One end of the first winding segment is the incoming line end of phase A, and the other end of the first winding segment is the outgoing line end of phase X2. From the incoming line end of phase A to the outgoing line end of phase X2 in the first winding segment, it is wound from the inside to the outside, and the outgoing line end of phase X4 is led out from the middle of the 19th layer of the first winding segment; the second winding segment is wound 21 layers, and a second half oil duct is formed between the 7th layer and the 8th layer of the second winding segment. One end of the second winding segment is the incoming line end of phase X, and the other end of the second winding segment is the outgoing line end of phase X3. From the incoming line end of phase X to the outgoing line end of phase X3 in the second winding segment, it is wound from the inside to the outside, and the outgoing line end of phase X5 is led out from the middle of the 19th layer of the second winding segment.

[0021] Except for the 8th layer, the layout of the first 20 layers in the first winding segment and the second winding segment is as follows: from the 2nd layer to the 20th layer, each layer includes: a front half segment and a rear half segment. The interval distance between the front half segment and the upper layer is d1, and the interval distance between the rear half segment and the upper layer is d2. The difference between d1 and d2 is △d, and the absolute value of △d is 2 mm; and the intervals between the 1st layer and the 7th layer and between the 8th layer and the 20th layer all meet the following conditions: the interval difference △d between the upper adjacent two layers + the interval difference △d between the lower adjacent two layers = 0 (the meaning of this sentence is: if the front half segment d1 between the upper adjacent two layers is 2 mm larger than the rear half segment d2, then the front half segment d1 between the lower adjacent two layers is 2 mm smaller than the rear half segment d2, so that after winding to the 7th layer and the 20th layer of the second layer, it is a cylindrical structure and there will be no slope). The design of this interval △d achieves the effect of a smaller final diameter after winding, and at the same time increases the interval between layers and improves the insulation effect.

[0022] The interval between the 2nd layer and the 1st layer: d1 = 5 mm, d2 = 7 mm; the adjacent intervals between the 2nd layer and the 7th layer or between the 8th layer and the 20th layer: d1 = 6 mm or 4 mm, d2 = 4 mm or 6 mm. Due to the incoming line end led out from the 1st layer, the interval between the 2nd layer and the 1st layer needs to be larger. Since it is a cylindrical structure after winding to the 20th layer, the winding intervals between the 21st layer and the 20th layer are all set to 7 layers, so as to ensure that the outer wall of the final coil presents a cylindrical structure and ensure the appearance is beautiful.

[0023] The distance between the 21st layer and the 20th layer is 7 mm. Since there are lead-out terminals of phase X4 or phase X5 on the 20th layer, and the lead-out terminals of phase X2 or phase X3 need to be pulled out after the 21st layer, the winding interval between the 21st layer and the 20th layer is enlarged to ensure that there is no interference between the lead-out terminals.

[0024] There are insulating isolation rings on the outermost layers of the first winding segment and the second winding segment. The insulating isolation ring includes: a dotting paper layer and a tightening belt layer. The dotting paper layer surrounds the outermost layer of the corresponding first winding segment or second winding segment, and the tightening belt layer is wound outside the dotting paper layer. This ensures the insulation effect of the outermost layers of the first winding segment and the second winding segment.

[0025] The dotting paper layer has three layers.

[0026] The A-phase incoming line terminal is connected to a first static screen lead wire, and the A-phase incoming line terminal and the first static screen lead wire are led out from one end of the first winding segment; the X-phase incoming line terminal is connected to a second static screen lead wire, and the X-phase incoming line terminal and the second static screen lead wire are led out from one end of the second winding segment. This ensures the removal of the incoming power at the incoming line terminal.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. The longitudinal sectionalized high-voltage coil of the 27.5 kV oil-immersed transformer used for railways is characterized in that, Including: A first winding segment and a second winding segment; After the first winding segment is wound, a first coil ring is formed. After the second winding segment is wound, a second coil ring is formed. The first coil ring is installed above the second coil ring, and the first coil ring and the second coil ring are isolated by an intermediate insulation isolation mechanism; The first winding segment is wound 21 layers. A first half oil duct is formed between the 7th layer and the 8th layer of the first winding segment. One end of the first winding segment is the incoming line end of phase A, and the other end of the first winding segment is the outgoing line end of phase X2. From the incoming line end of phase A to the outgoing line end of phase X2 in the first winding segment, it is wound from the inside to the outside. The outgoing line end of phase X4 is led out from the middle of the 19th layer of the first winding segment; The second winding segment is wound 21 layers. A second half oil duct is formed between the 7th layer and the 8th layer of the second winding segment. One end of the second winding segment is the incoming line end of phase X, and the other end of the second winding segment is the outgoing line end of phase X3. From the incoming line end of phase X to the outgoing line end of phase X3 in the second winding segment, it is wound from the inside to the outside. The outgoing line end of phase X5 is led out from the middle of the 19th layer of the second winding segment.

2. The longitudinally segmented high-voltage coil of the 27.5 kV oil-immersed transformer for railways according to claim 1, characterized in that Except for the 8th layer, the layout of the first 20 layers of the first winding segment and the second winding segment is as follows: From the 2nd layer to the 20th layer, it all includes: a first half segment and a second half segment. The interval distance from the first half segment to the upper layer is d1, and the interval distance from the second half segment to the upper layer is d2. The difference between d1 and d2 is △d, and the absolute value of △d is 2 mm; And the intervals between the 1st layer and the 7th layer and between the 8th layer and the 20th layer all meet the following conditions: the interval difference △d between the upper adjacent two layers + the interval difference △d between the lower adjacent two layers = 0.

3. The longitudinally segmented high-voltage coil of the 27.5 kV oil-immersed transformer for railways according to claim 2, characterized in that, The interval between the 2nd layer and the 1st layer: d1 = 5 mm, d2 = 7 mm; the adjacent intervals between the 2nd layer and the 7th layer or between the 8th layer and the 20th layer: d1 = 6 mm or 4 mm, d2 = 4 mm or 6 mm.

4. The longitudinally segmented high-voltage coil of the 27.5 kV oil-immersed transformer for railways according to claim 3, characterized in that, The spacing between the 21st layer and the 20th layer is all 7 mm.

5. The longitudinally segmented high-voltage coil of the 27.5 kV oil-immersed transformer for railways according to any one of claims 1 to 4, characterized in that, Both the outermost layers of the first winding segment and the second winding segment are provided with insulation isolation rings. The insulation isolation rings include: a dotting paper layer and a tightening belt layer. The dotting paper layer surrounds the outermost layer of the corresponding first winding segment or second winding segment, and the tightening belt layer is wound outside the dotting paper layer.

6. The longitudinally segmented high-voltage coil of the 27.5 kV oil-immersed transformer for railways according to claim 5, characterized in that, The dotting paper layer has three layers.

7. The longitudinally segmented high-voltage coil of the 27.5 kV oil-immersed transformer for railways according to claim 5, characterized in that, The incoming line end of phase A is connected with a first static screen lead wire, and the incoming line end of phase A and the first static screen lead wire are led out from one end of the first winding segment; the incoming line end of phase X is connected with a second static screen lead wire, and the incoming line end of phase X and the first static screen lead wire are led out from one end of the second winding segment.

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