A transformer voltage regulating coil outer side support structure

Abstract

The utility model relates to a kind of transformer voltage regulating coil outside bracing bar structure, including upper bracing bar and lower bracing bar, wherein upper bracing bar includes upper limiting portion, upper support portion and upper fitting portion sequentially arranged from top to bottom, lower bracing bar includes lower limiting portion, lower support portion and lower fitting portion sequentially arranged from bottom to top, upper limiting portion is located between voltage regulating coil and upper locking cylinder, lower limiting portion is located between voltage regulating coil and lower locking cylinder, upper fitting portion and lower fitting portion are fitted butt joint, and upper support portion, upper fitting portion, lower fitting portion and lower support portion are located between voltage regulating coil and external bracing bar, and gap is left between upper fitting portion and lower support portion and between lower fitting portion and upper support portion. The utility model can realize uninterrupted continuous support to the outside of voltage regulating coil, and still can adapt to the height change of coil under different conditions.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a structure of an outer support bar for a transformer voltage regulating coil. Background Technology

[0002] To transmit more electrical energy within the same footprint, the capacity requirements for a single transformer are increasing, and the voltage levels being transmitted are also rising. When a transformer uses on-load tap changing, placing the tap changing coil inside the transformer body is a common arrangement to avoid placing the higher voltage coil close to the core or to reduce the transformer's transport width.

[0003] When the voltage regulating coil is inside the transformer, the external support bars cannot be designed as a single unit because the upper and lower ends of the coil need to be locked. Furthermore, to ensure mechanical strength and short-circuit withstand capability, the coil operates under a certain pressure. Therefore, the coil is in a free state before insulation assembly, and its height in this state differs from its height under pressure. The height of the coil before assembly without pressure is higher than its height after assembly. Because the height change of the voltage regulating coil under pressure and without pressure must be considered, the external support bars cannot be locked at both ends, as this cannot accommodate changes in coil height. A common structure in existing technology divides the external support bars of the voltage regulating coil into three sections—upper, middle, and lower—with a certain gap between each section to accommodate changes in coil height under different conditions. However, this can easily lead to misalignment of the support bars between the voltage regulating coil and the external coil, thus failing to ensure full support for the outer surface of the voltage regulating coil. Utility Model Content

[0004] The purpose of this utility model is to provide a support bar structure for the outer side of a transformer voltage regulating coil, which can provide uninterrupted and continuous support for the outer side of the voltage regulating coil, while still being able to adapt to changes in coil height under different conditions.

[0005] The objective of this utility model is achieved through the following technical solution: A transformer voltage regulating coil outer support bar structure includes an upper support bar and a lower support bar. The upper support bar includes an upper limit part, an upper support part, and an upper fitting part arranged sequentially from top to bottom. The lower support bar includes a lower limit part, a lower support part, and a lower fitting part arranged sequentially from bottom to top. The upper limit part is located between the voltage regulating coil and the upper locking cylinder, and the lower limit part is located between the voltage regulating coil and the lower locking cylinder. The upper fitting part and the lower fitting part are fitted together. The upper support part, the upper fitting part, the lower fitting part, and the lower support part are all located between the voltage regulating coil and the outer support bar. Gaps are left between the upper fitting part and the lower support part, and between the lower fitting part and the upper support part.

[0006] The lower end of the upper support part is provided with an upper fitting part and an upper fitting stop along the width direction. The upper end of the lower support part is provided with a lower fitting part and a lower fitting stop along the width direction. When the lower end of the upper support bar is fitted and connected with the upper end of the upper support bar, the upper fitting part is inserted into the lower fitting stop, and the lower fitting part is inserted into the upper fitting stop. There are gaps between the lower end of the upper fitting part and the bottom surface of the lower fitting stop, and between the upper end of the lower fitting part and the bottom surface of the upper fitting stop.

[0007] The upper support, upper fitting, lower fitting, and lower support are all of equal thickness, H. After the upper and lower support bars are fitted together, a coil contact surface that contacts the voltage regulating coil is formed on the inner side in the thickness H direction, and a support bar contact surface that contacts the external support bar is formed on the outer side in the thickness H direction.

[0008] The thickness of the upper limit portion and the thickness of the lower limit portion are both less than the thickness H, and the inner side of the upper limit portion and the inner side of the lower limit portion are flush with the coil contact surface.

[0009] A transition arc surface is provided between the outer side of the upper limit part and the upper support part, and between the outer side of the lower limit part and the lower support part.

[0010] The voltage regulating coil has an inner cardboard tube inside, an electrostatic plate at the upper end of the voltage regulating coil, an upper insulating ring at the upper end of the electrostatic plate, and a lower insulating ring at the lower end of the voltage regulating coil.

[0011] An upper corner ring is provided between the electrostatic plate and the voltage regulating coil, and a lower corner ring is provided between the voltage regulating coil and the lower insulating ring.

[0012] An external coil is provided on the outside of the external support bar.

[0013] The advantages and positive effects of this utility model are as follows: 1. This utility model utilizes the interlocking and docking of the upper support bar and the lower support bar to achieve support for the outer side of the voltage regulating coil. Since the upper support part and the upper interlocking part of the upper support bar and the lower support part and the lower interlocking part of the lower support bar are all located between the voltage regulating coil and the outer support bar, uninterrupted and continuous support for the voltage regulating coil can be achieved, that is, it can ensure that the outer surface of the voltage regulating coil is fully supported.

[0014] 2. In this utility model, there is a certain gap between the lower end of the upper fitting part of the upper support bar and the bottom surface of the lower fitting stop of the lower support bar, and there is also a certain gap between the upper end of the lower fitting part of the lower support bar and the bottom surface of the upper fitting stop of the upper support bar. Therefore, this utility model can still adapt to the changes in coil height under different conditions.

[0015] 3. The interlocking design of the upper and lower support bars of this utility model will not affect the original structure of the transformer body, and can also easily replace the existing support bar assembly which is divided into three sections. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the usage state of this utility model. Figure 2 for Figure 1 Schematic diagram of the middle and lower support bars. Figure 3 for Figure 2 Left view of the lower middle support bar. Figure 4 for Figure 1 Enlarged view of point A in the image. Figure 5 for Figure 4 The K-direction view in the middle, Figure 6 This is a schematic diagram of the outer support bar structure of a voltage regulating coil in the prior art.

[0017] Among them, 1 is the upper locking cylinder, 2 is the voltage regulating coil, 3 is the lower locking cylinder, 4 is the upper support bar, 401 is the upper limit part, 402 is the upper support part, 403 is the upper fitting part, 4031 is the upper fitting stop, 5 is the lower support bar, 501 is the lower limit part, 5011 is the transition arc surface, 502 is the lower support part, 503 is the lower fitting part, 5031 is the lower fitting stop, 6 is the upper insulating ring, 7 is the inner cardboard cylinder, 8 is the electrostatic plate, 9 is the upper corner ring, 10 is the lower corner ring, 11 is the lower insulating ring, 12 is the outer support bar, 13 is the coil contact surface, 14 is the support bar contact surface, 15 is the support bar assembly, and 16 is the support bar gap. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] like Figures 1-5 As shown, this utility model includes an upper support bar 4 and a lower support bar 5. The upper support bar 4 includes an upper limit part 401, an upper support part 402, and an upper fitting part 403 arranged sequentially from top to bottom. The lower support bar 5 includes a lower limit part 501, a lower support part 502, and a lower fitting part 503 arranged sequentially from bottom to top. The upper limit part 401 is located between the voltage regulating coil 2 and the upper locking cylinder 1, and the lower limit part 501 is located between the voltage regulating coil 2 and the lower locking cylinder 3. The upper fitting part 403 and the lower fitting part 503 are fitted together. The upper support part 402, the upper fitting part 403, the lower fitting part 503, and the lower support part 502 are all located between the voltage regulating coil 2 and the outer support bar 12. There are gaps between the upper fitting part 403 and the lower support part 502, and between the lower fitting part 503 and the upper support part 402.

[0020] like Figures 4-5 As shown, in this embodiment, the upper fitting portion 403 and the upper fitting stop 4031 are along the width direction (i.e., Figure 2The lower fitting part 503 and the lower fitting stop 5031 are arranged side by side at the lower end of the upper support part 402 (in the width direction shown in the figure D), and are arranged along the width direction (i.e., the width direction shown in the figure D). Figure 2 The upper support strips (with width D as shown) are arranged side by side on the upper end of the lower support 502. When the lower end of the upper support strip 4 and the upper end of the upper support strip 5 are fitted together, as shown... Figure 5 As shown, the upper fitting part 403 is inserted into the lower fitting stop 5031, and the lower fitting part 503 is inserted into the upper fitting stop 4031. And as... Figure 1 As shown, since the above-mentioned interlocking structure does not affect the thickness direction (i.e. Figure 3 Along the thickness H direction shown, the upper support portion 402, the upper fitting portion 403, the lower fitting portion 503, and the lower support portion 502 are respectively in contact with the voltage regulating coil 2 and the external support strip 12 on both sides, thereby enabling the present invention to achieve uninterrupted support for the voltage regulating coil 2, while as Figure 5 As shown, a certain gap distance can be left between the lower end of the upper fitting part 403 and the bottom surface of the lower fitting stop 5031, as well as between the upper end of the lower fitting part 503 and the bottom surface of the upper fitting stop 4031. Therefore, this utility model can still adapt to changes in coil height under different conditions.

[0021] like Figure 3 and Figure 4 As shown in this embodiment, in order to ensure that the two sides of the support portion in the thickness direction are flush after the upper support bar 4 and the lower support bar 5 are connected, the upper support portion 402, the upper fitting portion 403, the lower fitting portion 503 and the lower support portion 502 are all of equal thickness, which is thickness H. In this way, after the upper support bar 4 and the lower support bar 5 are connected, the inner side in the thickness H direction forms a coil contact surface 13 that is flush with the outer side of the voltage regulating coil 2, and the outer side in the thickness H direction forms a support bar contact surface 14 that is flush with the outer support bar 12 and corresponds to the outer support bar 12. The outer side of the outer support bar 12 is provided with an outer coil.

[0022] like Figure 3 As shown, in this embodiment, the thickness of the upper limit portion 401 and the thickness of the lower limit portion 501 are both less than the thickness H, and the inner sides of both the upper limit portion 401 and the lower limit portion 501 are flush with the coil contact surface 13. A transition arc surface 5011 is provided between the outer side of the upper limit portion 401 and the upper support portion 402, and between the outer side of the lower limit portion 501 and the lower support portion 502. For example... Figure 1 As shown, the present invention can provide installation space for the upper locking cylinder 1 and the lower locking cylinder 3 through the above structure, thereby ensuring that the outer side of the upper locking cylinder 1 and the outer side of the lower locking cylinder 3 are flush with the contact surface 14 of the support bar, so as not to affect the support and fixation of the external support bar 12.

[0023] like Figure 1As shown, in this embodiment, the inner side of the voltage regulating coil 2 is supported by an inner cardboard tube 7. An electrostatic plate 8 is provided at the upper end of the voltage regulating coil 2, and an upper insulating ring 6 is provided at the upper end of the electrostatic plate 8. A lower insulating ring 11 is provided at the lower end of the voltage regulating coil 2. Furthermore, an upper corner ring 9 is provided between the electrostatic plate 8 and the voltage regulating coil 2, and a lower corner ring 10 is provided between the voltage regulating coil 2 and the lower insulating ring 11. All of the above structures are known in the art.

[0024] The working principle of this utility model is as follows: like Figure 6 As shown, in the prior art, the support bar assembly 15 on the outside of the voltage regulating coil 2 includes three sections: upper, middle and lower. The upper section is locked by the upper locking cylinder 1, and the lower section is locked by the lower locking cylinder 3. Support bar gaps 16 are formed between the middle section and the upper section, as well as between the middle section and the lower section, to adapt to changes in coil height under different conditions. However, due to the existence of the support bar gaps 16, the existing support bar assembly 15 cannot provide continuous support for the voltage regulating coil 2. At the same time, the middle section is prone to movement due to the presence of support bar gaps 16 at both the top and bottom, which leads to it not being able to completely correspond with the outer support bar 12 on the outside. This also makes it impossible to ensure that the outer surface of the voltage regulating coil 2 is fully supported by the support bar.

[0025] And such Figure 1 As shown, this utility model utilizes the interlocking of the upper support bar 4 and the lower support bar 5 to support the outer side of the voltage regulating coil 2. Since the support part 402, the upper interlocking part 403, the lower interlocking part 503, and the lower support part 502 are all located between the voltage regulating coil 2 and the outer support bar 12, continuous and uninterrupted support can be achieved for the voltage regulating coil 2, ensuring that the outer surface of the voltage regulating coil 2 receives full support from the support bar. Furthermore, as... Figure 5 As shown, since there are certain gaps between the lower end of the upper fitting part 403 and the bottom surface of the lower fitting stop 5031, and between the upper end of the lower fitting part 503 and the bottom surface of the upper fitting stop 4031, this utility model can still adapt to changes in coil height under different conditions. The design of the upper support bar 4 and the lower support bar 5 of this utility model does not affect the original structure of the transformer body, which also facilitates the replacement of the existing three-section support bar assembly 15.

Claims

1. A support bar structure for the outer side of a transformer voltage regulating coil, characterized in that: It includes an upper support bar (4) and a lower support bar (5), wherein the upper support bar (4) includes an upper limit part (401), an upper support part (402) and an upper fitting part (403) arranged sequentially from top to bottom, and the lower support bar (5) includes a lower limit part (501), a lower support part (502) and a lower fitting part (503) arranged sequentially from bottom to top. The upper limit part (401) is located between the voltage regulating coil (2) and the upper locking cylinder (1), and the lower limit part (501) is located between the voltage regulating coil (2) and the upper locking cylinder (1). Between the coil (2) and the lower locking cylinder (3), the upper fitting part (403) and the lower fitting part (503) are fitted together, and the upper support part (402), the upper fitting part (403), the lower fitting part (503) and the lower support part (502) are all located between the voltage regulating coil (2) and the external support bar (12). There are gaps between the upper fitting part (403) and the lower support part (502) and between the lower fitting part (503) and the upper support part (402).

2. The transformer voltage regulating coil outer support bar structure according to claim 1, characterized in that: The lower end of the upper support (402) is provided with an upper fitting part (403) and an upper fitting stop (4031) along the width direction. The upper end of the lower support (502) is provided with a lower fitting part (503) and a lower fitting stop (5031) along the width direction. When the lower end of the upper support (4) and the upper end of the lower support (5) are fitted together, the upper fitting part (403) is inserted into the lower fitting stop (5031), and the lower fitting part (503) is inserted into the upper fitting stop (4031). There are gaps between the lower end of the upper fitting part (403) and the bottom surface of the lower fitting stop (5031) and between the upper end of the lower fitting part (503) and the bottom surface of the upper fitting stop (4031).

3. The transformer voltage regulating coil outer support bar structure according to claim 1, characterized in that: The upper support part (402), the upper fitting part (403), the lower fitting part (503) and the lower support part (502) have the same thickness, which is H. After the upper support bar (4) and the lower support bar (5) are fitted together, a coil contact surface (13) that contacts the voltage regulating coil (2) is formed on the inner side in the thickness H direction, and a support bar contact surface (14) that contacts the outer support bar (12) is formed on the outer side in the thickness H direction.

4. The transformer voltage regulating coil outer support bar structure according to claim 3, characterized in that: The thickness of the upper limit portion (401) and the thickness of the lower limit portion (501) are both less than the thickness H, and the inner side of the upper limit portion (401) and the inner side of the lower limit portion (501) are flush with the coil contact surface (13).

5. The transformer voltage regulating coil outer support bar structure according to claim 4, characterized in that: A transition arc surface (5011) is provided between the outer side of the upper limit part (401) and the upper support part (402), and between the outer side of the lower limit part (501) and the lower support part (502).

6. The transformer voltage regulating coil outer support bar structure according to claim 1, characterized in that: The voltage regulating coil (2) has an inner cardboard tube (7) inside, an electrostatic plate (8) is provided at the upper end of the voltage regulating coil (2), and an upper insulating ring (6) is provided at the upper end of the electrostatic plate (8), and a lower insulating ring (11) is provided at the lower end of the voltage regulating coil (2).

7. The transformer voltage regulating coil outer support bar structure according to claim 6, characterized in that: An upper corner ring (9) is provided between the electrostatic plate (8) and the voltage regulating coil (2), and a lower corner ring (10) is provided between the voltage regulating coil (2) and the lower insulating ring (11).

8. The transformer voltage regulating coil outer support bar structure according to claim 1, characterized in that: An external coil is provided on the outside of the external support bar (12).

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