Transformer

Abstract

To provide a transformer capable of reducing a length of a tank in a direction along a winding shaft line.SOLUTION: A transformer 10 comprises: a tank 11; a plurality of cylinder windings 13, 14, and 15 that is housed in an internal part of the tank 11; an operation handle 16 that is provided to an external part of the tank 11; and a long-shaped tap switching device 17 to which a plurality of tap wires 13a, 14a, and 15a led from each of the plurality of cylinder windings 13, 14, and 15 is connected, and the operation handle 16 is coupled, and which switches each of the tap wires 13a, 14a, and 15a electrically connected by operating the operation handle 16. In the plurality of cylinder windings 13, 14, and 15, each of winding shaft lines L is parallelly arranged, and is arranged in parallel along a parallel shaft line X orthogonal to each winding shaft line L. In the tap switching device 17, an own long shaft line M is parallely arranged as a winding shaft line L, and the long shaft line M is arranged between the winding shaft lines L in view of a depth direction orthogonal to the winding shaft line L and the parallel shaft line X.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a transformer. [Background technology]

[0002] Some transformers include a tank, a plurality of windings housed inside the tank, an operating unit provided outside the tank, and a long tap changer housed inside the tank (see, for example, Patent Document 1). The tap changer is connected to a plurality of tap wires drawn from each of the plurality of windings and is also connected to the operating unit. The tap changer switches the electrically connected tap wires when the operating unit is operated. This enables the transformer to change the voltage to a value that corresponds to the operating position of the operating unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-311017 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above transformer, the tap changer is disposed above the windings inside the tank. More specifically, the windings are arranged in a row with their winding axes parallel to each other. The tap changer is disposed above the windings in a direction along the winding axis and in parallel with them. It is necessary to ensure an insulation distance between the tap changer and the windings and the upper part of the tank. Therefore, in such a transformer, there is a problem that the length of the tank in the direction along the winding axis becomes large. This makes it difficult to transport the transformer, for example. [Means for solving the problem]

[0005] A transformer that solves the above problem includes a tank, a plurality of cylindrical windings housed inside the tank, an operating unit provided outside the tank, and a long tap changer to which a plurality of tap wires drawn from each of the plurality of windings are connected and to which the operating unit is coupled, and which switches the electrically connected tap wires by operating the operating unit, wherein the plurality of windings are arranged with their respective winding axes parallel to each other and are arranged side by side along a juxtaposition axis perpendicular to the winding axis, and the tap changer has its own longitudinal axis parallel to the winding axis and, when viewed in a depth direction perpendicular to the winding axis and the juxtaposition axis, has its longitudinal axis arranged between the winding axes.

[0006] According to this configuration, since the tap changer is disposed with its own longitudinal axis parallel to the winding axis, the length of the tank in the direction along the winding axis can be made smaller than, for example, a case in which the longitudinal axis is disposed parallel to the juxtaposition axis and arranged alongside the winding in the direction along the winding axis. Also, since the tap changer is disposed between the winding axes when viewed in the depth direction perpendicular to the winding axis and the juxtaposition axis, the distance from the outer circumferential surface of the winding to the tap changer can be made longer than a case in which the longitudinal axis is arranged at a position coinciding with the winding axis. Thus, the insulation distance between the winding and the tap changer can be secured while reducing the length of the tank in the depth direction. Effect of the Invention

[0007] According to the transformer of the present disclosure, the length of the tank in the direction along the winding axis can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic explanatory side view of the arrangement of components of a transformer according to one embodiment. [Diagram 2] FIG. 2 is a schematic explanatory diagram showing the arrangement of each component of the transformer according to one embodiment, viewed from above. [Diagram 3] FIG. 3 is a schematic explanatory diagram showing the arrangement of components of a transformer according to another embodiment, as viewed from above. [Figure 4] FIG. 4 is a schematic explanatory diagram showing the arrangement of the components of a transformer according to another embodiment, as viewed from above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the transformer will be described below. (Overall configuration of transformer 10) 1, a transformer 10 includes a tank 11, an iron core 12, a plurality of windings 13, 14, and 15, an operating handle 16 as an operating unit, a tap changer 17, and insulating oil 18. The transformer 10 of this embodiment is a three-phase transformer, and the plurality of windings 13, 14, and 15 are composed of an R-phase winding 13, an S-phase winding 14, and a T-phase winding 15. The tap changer 17 of this embodiment is a no-voltage tap changer that can be switched only in a no-voltage state.

[0010] (Tank 11 Configuration) The tank 11 has a tank body 19 and a tank cover 20. The tank body 19 is formed in a cylindrical shape with a bottom. More specifically, the tank body 19 has a rectangular plate-shaped bottom 19a and four side walls 19b forming a cylindrical shape. In the present embodiment, the transformer 10 is disposed with the bottom 19a facing the ground, and the side on which the bottom 19a is disposed is described as the lower side. The tank cover 20 is formed in a rectangular plate shape and is fixed to the tank body 19 so as to close the upper opening of the side walls 19b.

[0011] (Structure of iron core 12) The iron core 12 is accommodated inside the tank 11. The iron core 12 has a plurality of rod-shaped iron core bodies 12a and a pair of connecting portions 12b, 12c that connect the plurality of iron core bodies 12a to each other. In this embodiment, three iron core bodies 12a are provided corresponding to the R-phase winding 13, the S-phase winding 14, and the T-phase winding 15. The three iron core bodies 12a are arranged with their respective axes aligned in the vertical direction. The three iron core bodies 12a are also arranged side by side along a parallel axis X that corresponds to the width direction of the transformer 10. One connecting portion 12b connects the upper ends of the three iron core bodies 12a, and the other connecting portion 12c connects the lower ends of the three iron core bodies 12a.

[0012] (Configuration of multiple windings 13, 14, 15) The multiple windings 13, 14, 15 are housed inside the tank 11. The multiple windings 13, 14, 15 are wound around the core body 12a. As a result, the multiple windings 13, 14, 15 are arranged with their respective winding axes L parallel to each other and are arranged side by side along a parallel axis X perpendicular to the winding axis L. Each of the multiple windings 13, 14, 15 has multiple tap wires 13a, 14a, 15a drawn out from multiple points along the way of winding.

[0013] (Configuration of the operating handle 16) The operating handle 16 is provided outside the tank 11. In this embodiment, the operating handle 16 is provided above the tank cover 20. The operating handle 16 has a shaft 16a, and the shaft 16a penetrates the tank cover 20 and is provided rotatable about the shaft 16a.

[0014] (Configuration of tap changer 17) The tap changer 17 is connected to the tap wires 13a, 14a, 15a drawn from the windings 13, 14, 15, respectively, and is connected to an operating handle 16. The tap changer 17 is configured to switch the electrically connected tap wires 13a, 14a, 15a by operating the operating handle 16. For example, the tap changer 17 has a long guide bar to which tap terminals fixed to the ends of the tap wires 13a, 14a, 15a are fixed, and a movable contact that moves along the guide bar to switch the electrically connected tap terminals. For example, the shaft 16a of the operating handle 16 is drivingly connected to the movable contact via a gear such as a bevel gear or a rack and pinion. As a result, when the operating handle 16 is rotated, the movable contact moves along the guide bar to switch the electrically connected tap wires 13a, 14a, 15a.

[0015] As shown in FIGS. 1 and 2, the tap changer 17 of this embodiment is disposed such that its longitudinal axis M is parallel to the winding axis L. Moreover, the tap changer 17 is disposed between the winding axes L when viewed in a depth direction Y perpendicular to the winding axis L and the parallel installation axis X. In other words, the tap changer 17 is disposed within a range A between the winding axes L when viewed in the depth direction Y. Note that this range A does not include a position that coincides with the winding axis L. Moreover, in this embodiment, the longitudinal axis M of the tap changer 17 is disposed at a central position between the winding axes L when viewed in the depth direction Y.

[0016] As shown in FIG. 2, in this embodiment, the tap changer 17 is disposed outside the windings 13, 14, and 15 relative to a straight line N tangent to the outer circumference of the windings 13, 14, and 15. In this embodiment, the tank 11 has four flat side walls 19b so that the tank 11 is rectangular as a whole when viewed from the direction along the winding axis L. The four side walls 19b are sized to ensure a sufficient insulation distance between the tank 11 and the windings 13, 14, and 15 and the tap changer 17. Although the tank 11 is illustrated as a perfect rectangle in FIG. 2, the corners may be rounded or the side walls 19b may have a slight uneven shape. The tank 11 is filled with insulating oil 18.

[0017] Next, the operation of this embodiment will be described. In the transformer 10 configured as described above, when the operating handle 16 is rotated by an operator, the tap wires 13a, 14a, and 15a electrically connected in the tap changer 17 are switched. As a result, in the transformer 10, the voltage is changed to a value according to the operating position of the operating handle 16.

[0018] Next, the effects of the above embodiment will be described below. (1) The tap changer 17 is disposed such that its own longitudinal axis M is parallel to the winding axis L. Therefore, for example, the length of the tank 11 in the direction along the winding axis L can be made smaller than when the tap changer 17 is disposed such that its longitudinal axis M is parallel to the parallel installation axis X and aligned with the windings 13, 14, and 15 in the direction along the winding axis L. In other words, the height of the tank 11 can be made lower. As a result, for example, the transformer 10 can be easily transported. In addition, for example, it is easy for an operator to operate the operating handle 16.

[0019] Furthermore, the longitudinal axis M of the tap changer 17 is disposed between the winding axes L when viewed in the depth direction Y perpendicular to the winding axis L and the parallel installation axis X. This allows a longer distance to be secured from the outer circumferential surfaces of the windings 13, 14, 15 to the tap changer 17 compared to a case in which the longitudinal axis M is disposed at a position coinciding with the winding axis L. This allows an insulation distance to be secured between the windings 13, 14, 15 and the tap changer 17 while reducing the length of the tank 11 in the depth direction Y.

[0020] (2) The longitudinal axis M of the tap changer 17 is disposed at the center position between the winding axes L when viewed in the depth direction Y, so that the distance from the outer peripheral surfaces of the windings 14, 15 to the tap changer 17 can be ensured to be the longest and even.

[0021] (3) Since the transformer 10 is a type in which the tank 11 is filled with insulating oil 18, the length of the tank 11 in the direction along the winding axis L can be reduced, thereby reducing the amount of insulating oil 18.

[0022] (4) The tank 11 has four flat side walls 19b such that the tank 11 is rectangular as a whole when viewed in a direction along the winding axis L, and therefore has a simple shape and is easy to manufacture. That is, in this embodiment, although the tap changer 17 is disposed outside the windings 13, 14, 15 relative to the straight line N that is tangent to the outer circumference of the multiple windings 13, 14, 15, the side walls 19b do not have a special shape but are uniformly flat, which makes it easy to manufacture.

[0023] (Example of change) The above-described embodiments can be modified as follows: Each embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0024] In the above embodiment, the tap changer 17 is arranged outside the windings 13, 14, 15 relative to the straight line N tangent to the outer periphery of the windings 13, 14, 15, but this is not limited to the above. That is, at least a part of the tap changer 17 may be arranged closer to the windings 13, 14, 15 than the straight line N tangent to the outer periphery of the windings 13, 14, 15. This configuration can be adopted particularly when the voltage handled by the transformer 10 is low, since the insulation distance between the windings 13, 14, 15 and the tap changer 17 can be reduced.

[0025] For example, it may be modified as shown in Fig. 3. In this example, a part of the tap changer 17 is disposed closer to the windings 13, 14, 15 than a straight line N tangent to the outer circumference of the windings 13, 14, 15. In this way, the dead space between the windings 14, 15 can be utilized, and the length of the tank 11 in the depth direction Y can be reduced.

[0026] Also, in this example (see FIG. 3), the tank 11 has a partial protrusion 21 that protrudes outward to ensure a distance from the tap changer 17. That is, the side wall 19b in this example is not flat, but has a partial protrusion 21 that protrudes outward in part. In this way, for example, the volume of the tank 11 can be made smaller than when the side wall 19b is flat, and therefore the amount of insulating oil 18 can be reduced.

[0027] 4, for example. In this example, the tap changer 17 is entirely disposed on the windings 13, 14, 15 side of a straight line N tangent to the outer circumference of the windings 13, 14, 15. In this way, the dead space between the windings 14, 15 can be more effectively utilized, and the length of the tank 11 in the depth direction Y can be made shorter.

[0028] In the above embodiment, the longitudinal axis M of the tap changer 17 is disposed at the center position between the winding axes L when viewed in the depth direction Y, but this is not limited to this and the longitudinal axis M may be configured to be offset from the center position.

[0029] In the above embodiment, the tank 11 is filled with insulating oil 18, but this is not limited thereto. For example, the transformer 10 may be of a type in which the tank 11 is filled with insulating gas.

[0030] In the above embodiment, the transformer 10 is a three-phase transformer, but is not limited thereto and may be, for example, a single-phase transformer. In this case, the number of windings provided in the transformer is, for example, two.

[0031] In the above embodiment, the operating handle 16 is provided above the tank 11. However, this is not limited to this and may be changed to a configuration in which the operating handle 16 is provided on the side of the tank 11, for example.

[0032] In the above embodiment, the operating handle 16 is provided to be rotatable, but as long as it can operate the tap changer 17, it may be changed to another operating part, such as an operating lever capable of linear reciprocating motion. [Explanation of symbols]

[0033] 10...Transformer 11. Tank 13…Winding 13a…Tap line 14…Winding 14a…Tap line 15…Winding 15a…Tap line 16...Operation handle (operation part) 17...Tap changer 18...Insulating oil 21...Partial protrusion L: Winding axis M: Longitudinal axis N…straight line X…Parallel axis Y: Depth direction

Claims

1. Tanks and A plurality of cylindrical windings housed inside the tank; An operation unit provided outside the tank; a long tap changer to which a plurality of tap wires drawn from each of the plurality of windings are connected and to which the operation unit is coupled, and which switches the electrically connected tap wires by operating the operation unit; A transformer comprising: The plurality of windings are arranged such that their winding axes are parallel to each other and are arranged side by side along a parallel axis perpendicular to the winding axes, The tap changer has a longitudinal axis parallel to the winding axis, and when viewed in a depth direction perpendicular to the winding axis and the parallel arrangement axis, the longitudinal axis is disposed between the winding axes. Transformer.

2. The longitudinal axis of the tap changer is disposed at a center position between the winding axes as viewed in the depth direction.

2. The transformer of claim 1.

3. At least a part of the tap changer is disposed on the winding side of a straight line tangent to an outer periphery of the plurality of windings.

2. The transformer of claim 1.

4. The tap changer is disposed on the winding side relative to a straight line tangent to an outer periphery of the plurality of windings.

4. The transformer according to claim 3.

5. The tank is filled with insulating oil.

2. The transformer of claim 1.

6. The tank has four flat side walls such that the tank is generally rectangular when viewed along the winding axis.

2. The transformer of claim 1.

7. The tank has a partial protrusion protruding outward to ensure a distance from the tap changer.

2. The transformer of claim 1.

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