JP2020027867A - Protective covering for tap switcher - Google Patents

Abstract

To provide a protective covering for a tap switcher, capable of confirming a tap position without detachment.SOLUTION: A protective covering 1 includes a main body part 1a covering all of a handle 8. The main body part 1a is provided with a window part 1d capable of viewing one identifier corresponding to a current tap position from a plurality of identifiers indicating the tap position written on an attachment surface of the handle 8.SELECTED DRAWING: Figure 6

Description

  An embodiment of the present invention relates to a protective cover for a tap changer for protecting a handle of the tap changer.

  2. Description of the Related Art Conventionally, a stationary induction device such as a transformer in which a tap changer is housed in a tank is provided with a handle for changing a tap position on an outer surface of the tank. At this time, the handle is generally protected by a protective cover so as not to be inadvertently operated (for example, see Patent Document 1).

JP 2005-311017 A

  Now, in the case of such a stationary induction device, since the tap changer itself is housed in the tank, an identifier such as a number indicating the tap position is written near the handle on the outer surface of the tank. The operator switches the tap position by turning the handle to the identifier indicating the desired tap position. Therefore, if there is no protective cover, the current tap position can be grasped by the direction of the handle.

However, when the protective cover is attached, the handle is hidden, so that the tap position cannot be determined based on the direction of the handle, and in the conventional general protective cover, the identifier itself is often hidden. . Therefore, for example, when it is desired to confirm the tap position by inspection or the like, it is necessary to remove the protective cover fastened by bolts or the like.
Therefore, a protective cover for a tap changer that can confirm a tap position without removing it is provided.

  The protective cover for the tap changer of the embodiment has a main body that covers the entire handle, and the main body has a current tap position among a plurality of identifiers indicating the tap positions written on the mounting surface of the handle. And a window portion for making one identifier corresponding to.

The figure which shows typically the structural example of the transformer of embodiment. The figure which shows the structural example of a tap changer typically The figure which shows the structural example of a handle typically The figure which shows the structural example of a code plate and an identifier typically The figure which shows an example of the correspondence of the direction of a handle and the position of an identifier typically The figure which shows the structural example of a protective cover typically The figure which shows an example of the state which attached the protective cover typically The figure which shows typically the other structural examples of a slit and a key FIG. 1 schematically shows another example of the configuration of the defining unit. FIG. 2 schematically illustrates another example of the configuration of the defining unit. Diagram schematically showing another configuration example of the identifier FIG. 1 schematically shows another configuration example of the window portion. FIG. 2 schematically shows another example of the configuration of the window portion.

Hereinafter, embodiments will be described with reference to the drawings.
As shown in FIG. 1, the protective cover 1 of the present embodiment is attached to, for example, a transformer 2 as a static induction device. The transformer 2 includes a tank 3, an iron core 4 housed in the tank 3, a transformer main body 6 having a winding 5, a tap changer 7, and the like. 8 and a code plate 9 on which tap positions are indicated. The tank 3 is filled with insulating oil (not shown), and the transformer body 6 and the tap changer 7 are accommodated in the insulating oil while being immersed therein.

  As is well known, the iron core 4 constituting the transformer main body 6 is formed by laminating, for example, thin electromagnetic steel plates. In the present embodiment, a tripod core having three legs is used as the iron core 4. Each leg of the iron core 4 is provided with a winding 5. These three windings 5 correspond to three phases of U phase, V phase and W phase, respectively.

  The windings 5 of each phase are provided, for example, in the upper part of the tank 3 and are connected to three bushings 10 communicating with the inside of the tank 3, respectively. A tap wire 11 is drawn out from the winding 5 of each phase, and is connected to a tap terminal 7 a of the tap changer 7. The tap terminals 7 a correspond to fixed contacts, and a plurality of tap terminals 7 a are provided for each winding 5 in order to make the turns ratio of the transformer 2 variable.

  In detail, as shown in FIG. 2, the tap switch 7 includes a terminal plate 7b provided with six tap terminals 7a corresponding to each phase, and any two tap terminals 7a of each phase. A slide plate 7d provided with three movable contacts 7c that electrically connect between them, and a part thereof is provided with a gear cut, and by rotating by meshing with a gear cut portion of the slide plate 7d. A gear 7e for sliding the slide plate 7d linearly. The slide plate 7d and the gear 7e constitute a so-called rack and pinion type rotation mechanism.

  If the six tap terminals 7a of each phase provided on the terminal plate 7b are numbered 1 to 6 in order from the left side, that is, from the side opposite to the gear 7e, the terminal plate 7b has the first number of each phase. The tap terminals 7a from No. to No. 6 are arranged at regular intervals of a distance (T) from each other, and are arranged so that the distances to the same-numbered tap terminals 7a of other phases are equal. The three movable contacts 7c provided on the slide plate 7d are arranged at equal intervals.

  Therefore, when the movable contact 7c corresponding to the U-phase is located at a position for electrically connecting the first and second tap terminals 7a, the movable contact 7c corresponding to the V-phase also has the first and second taps. The position where the terminals 7a are electrically connected to each other, and the movable contact 7c corresponding to the W phase is also at the position where the first and second tap terminals 7a are electrically connected. Although not shown, the tap terminal 7a penetrates the terminal plate 7b, and is electrically connected to the rear side of the terminal plate 7b, that is, the portion protruding toward the slide plate 7d by the movable contact 7c. It has a structure.

  Hereinafter, a tap position at which the movable contact 7c of each phase electrically connects the first and second tap terminals 7a is referred to as a first position (P1), and an electrical connection between the second and third tap terminals 7a is made. The tap position for electrically connecting is referred to as a second position (P2), the tap position for electrically connecting between the third and fourth tap terminals 7a is referred to as a third position (P3), and the fourth and fifth positions. The tap position for electrically connecting the tap terminals 7a is referred to as a fourth position (P4), and the tap position for electrically connecting the fifth and sixth tap terminals 7a is referred to as a fifth position (P5). That is, the tap changer 7 of the present embodiment can switch to five tap positions. However, the number of tap terminals 7a and the number of tap positions described in the present embodiment are merely examples, and the present invention is not limited thereto.

  The switching of the tap position is performed by operating the handle 8 connected by the shaft 7f. The handle 8 is operated by an operator, and is capable of rotating forward and backward. Here, the rotation direction when switching the tap position from the first position (P1) to the second position (P2) is normal rotation, and the reverse rotation is reverse rotation.

  As shown in FIG. 3, the handle 8 is formed in a substantially rectangular frame shape in a side view. In the handle 8, a slit 8 a communicating with the inside is provided along a longitudinal direction of the handle 8 at a central portion of a portion serving as an upper surface in plan view. That is, in the present embodiment, the slit 8a is formed in a rectangular shape having a predetermined length in the longitudinal direction of the handle 8 and a predetermined width in the short direction of the handle 8 as shown in plan view. It is formed in a shape that is symmetrical in the longitudinal and transverse directions with respect to the center of the handle 8.

  The code plate 9 is provided on a shaft 7f to which the handle 8 is attached. As shown in FIG. 4, the code plate 9 is formed in an annular shape having a hole through which the shaft 7f passes, and is fixed to the outer surface of the tank 3. Therefore, even if the operator operates the handle 8, the direction of the code plate 9 does not necessarily rotate.

  In this embodiment, numbers (N) from No. 1 to No. 5 are described on the code plate 9 as a plurality of identifiers indicating tap positions. In the present embodiment, each number is described at a position in which the central angle is shifted by 63 ° in the circumferential direction, and each number is arranged such that no other number is located at a position 180 ° from itself. For this reason, in the present embodiment, the number written on the code plate 9, that is, the current tap position can be grasped by the direction of the handle 8. At this time, each identifier is written such that the center of the number is located on the circumference of the radius (L1).

  Specifically, as shown in FIG. 5, the number located in the vertical direction indicated by the arrow with respect to the short direction of the handle 8 is the current tap position. For example, if the number in the vertical direction of the handle 8 is “1”, it indicates that the tap position is the first position (P1). The arrows indicating the vertical directions are given for convenience of explanation.

  Similarly, if the vertical number of the handle 8 is “2”, it indicates that the tap position is the second position (P2), and if the vertical number of the handle 8 is “3”, the tap position is the second position (P2). If the vertical position number of the handle 8 is “4”, it indicates that the tap position is the fourth position (P4), and the vertical number of the handle 8 is “5”. "Indicates that the tap position is the fifth position (P5).

  At this time, the tap changer 7 used for the transformer 2 or the like requires a certain amount of force when switching the tap position, as is well known. Therefore, when the handle 8 is positioned at the tap position, the handle 8 is maintained in a predetermined direction, that is, in a state of facing any number. When the handle 8 faces any number, no other number is located at the opposite position, so that the current tap position can be grasped by the direction of the handle 8. I have.

  The handle 8 and the code plate 9 are covered with the protective cover 1 on the outer surface of the tank 3. As shown in FIG. 6, the protective cover 1 has a bottomed cylindrical main body 1 a and a flange 1 b protruding radially outward on the opening side of the main body 1 a and having substantially the same diameter as the code plate 9. And The main body 1a has a key 1c on the inner surface of the bottom and a window 1d on a part of the flange 1b. Although not shown, the protective cover 1 is fixed to the code plate 9 or a base on which the code plate 9 is mounted by bolts.

  The key 1c is provided at the center of the main body 1a, and has a similar shape to the slit 8a having a predetermined length (L11) and a width (L12) in the radial direction of the main body 1a as shown in plan view. As shown in a side view, the main body 1a is formed in a plate shape having a predetermined height (L13) in the axial direction. The length of the key 1c (L11) is shorter than the length (L1) of the slit 8a provided in the handlebar 8 and longer than the width (L2) of the slit 8a.

  The width (L12) of the key 1c is set to be shorter than the width (L2) of the slit 8a, and the height of the key 1c is lower than the upper surface of the handle 8 in a state where the handle 8 is protected by the protective cover 1. It is set so as to be located lower than that. Therefore, when the key 1c is attached to the protective cover 1, the key 1c can be handled only in the direction that matches the length direction of the slit 8a, that is, in two directions in which the main body 1a is 180 ° inverted in this embodiment. 8 will be inserted into the slits 8a provided. In other words, the key 1c limits the mounting direction of the protective cover 1 to the handle 8 to two directions.

  At this time, as described above, since no other identifier is arranged at a position 180 ° opposite to any of the identifiers, the identifier is visible in the window 1d because the window 1d is Only in the state of being attached so as to be the position of the identifier corresponding to the tap position of. That is, the key 1c functions as a defining unit that defines the mounting direction of the main unit 1a, that is, the protective cover 1, so that the window 1d is located at the position of the identifier corresponding to the current tap position.

  The window portion 1d penetrates through the flange portion 1b in the thickness direction, the width thereof is larger than the width of the identifier written on the code plate 9, and the inside thereof is disposed on a circumference having a radius (L1) from the center. It is formed so as to be inside of the identifier. That is, although details will be described later, the window 1d is formed at a position where any of the identifiers can be visually recognized when the protective cover 1 is attached.

Next, the operation of the above-described protective cover 1 will be described.
A handle 8 of the tap changer 7 is attached to the outer surface of the tank 3 so that the tap changer 7 can be operated from the outside. An identifier such as a number indicating a tap position is indicated near the handle 8 by, for example, a code plate 9. Is done. Therefore, when the handle 8 is operated, the current tap position can be grasped from the direction of the handle 8 as described above.

  However, when the protective cover 1 is attached so that the handle 8 is not carelessly operated, the handle 8 is hidden by the protective cover 1, so that the tap position can be grasped by the direction of the handle 8 or the like. Disappears. Further, for example, when the flange portion 1b of the protective cover 1 and the code plate 9 have substantially the same diameter as in the present embodiment, the identifier itself becomes invisible. Therefore, for example, when it is desired to check the current tap position at the time of inspection, it is necessary to remove the protective cover 1 fixed by bolts or the like.

  Therefore, in the present embodiment, the tap position can be confirmed without removing the protective cover 1. Specifically, the protective cover 1 is provided with the window 1d at a part of the flange 1b as described above, and the window 1d is formed in a shape that allows the identifier to be visually recognized. Further, since the protective cover 1 is provided with the key 1c, the mounting direction is limited to the direction in which the key 1c is inserted into the slit 8a. And, as described above, the key 1c defines the mounting direction of the protective cover 1 in which the identifier is visible.

  Thus, as shown in FIG. 7, for example, when the tap position is the first position (P1) and the protective cover 1 is attached in a direction in which the identifier can be visually recognized, the number of “1” corresponding to the current tap position Becomes visible from the window 1d. As a result, the current tap position can be grasped without removing the protective cover 1. In the case of the present embodiment, only the number “1” corresponding to the current tap position is visible.

  Similarly, when the tap position is the second position (P2), only the identifier of “2” becomes visible, and when the tap position is the third position (P3), only the identifier of “3” becomes visible. When the position is the fourth position (P4), only the identifier of “4” becomes visible, and when the tap position is the fifth position (P5), only the identifier of “5” becomes visible.

  As shown in FIG. 7 as a fifth position (reverse direction), for example, if the protective cover 1 is mounted in the reverse direction by 180 ° in spite of the fact that the protective cover 1 is in the fifth position (P5). Since the number becomes invisible from 1d, the number cannot be seen at the time of attachment, so it can be grasped that the protective cover 1 is reversed, and the protective cover 1 is mistakenly attached in the opposite direction. Has been prevented.

According to the protective cover 1 described above, the following effects can be obtained.
The protective cover 1 has a main body 1 a that covers the entire handle 8, and the main body 1 a corresponds to the current tap position among a plurality of identifiers indicating tap positions written on the mounting surface of the handle 8. A window 1d that allows one identifier to be viewed is formed. Thus, the current tap position can be grasped even with the protective cover 1 attached, and the current tap position can be grasped and confirmed without removing the protective cover 1.

  In addition, the protective cover 1 is provided with a key 1c as a defining part for defining the mounting direction of the main body 1a in the main body 1a such that the window 1d is located at the position of the identifier corresponding to the current tap position. . Thereby, the possibility that the protective cover 1 is attached in the wrong direction can be reduced.

  In addition, the protective cover 1 has a key 1c that can be inserted into a slit 8a provided in the handle 8 as a defining portion. Thereby, the direction of the protective cover 1 and the direction of the handle 8 are defined, and the possibility of attaching the protective cover 1 in the wrong direction can be reduced.

  In this case, by making the shape of the key 1c and the shape of the slit 8a similar to each other as in the embodiment, it is possible to limit the direction of the protective cover 1 to two inversions of 180 °. By arranging the identifiers so that the other identifiers are not positioned 180 ° in the opposite position, it is possible to limit the identifiers to one of them, and it is possible to prevent the protective cover 1 from being attached in the wrong direction.

  Further, by adopting a configuration in which the other numbers are hidden by the flange portion 1b as in the embodiment, it is possible to prevent the tap position from being erroneously recognized as compared with a case where a cover in which the inside is easily visible is attached. Can be obtained.

  In the protective cover 1, the main body 1a is formed in a cylindrical shape with a bottom and has a flange 1b on the opening side, and the window 1d is formed so that the outer periphery of the flange 1b corresponds to a width corresponding to one identifier. It is formed by depressing inward in the radial direction. Thus, the window 1d can be easily formed by drilling or the like after forming the main body 1a and the flange 1b by shaving or the like. In this case, a protective cover that can easily confirm the current tap position without removing the protective cover 1 can be easily formed by forming a hole having a size that allows the identifier to be visually recognized in the flange portion 1b instead of the depression as in the embodiment. 1 can be manufactured.

Further, the above-described configuration can be appropriately changed, expanded, or combined.
In the embodiment, a rectangular slit 8a is illustrated as a so-called key 1c groove into which the key 1c is inserted. For example, as shown in FIG. If the key 1c is not symmetrical with respect to the center of the handle 8, the position of the key 1c is shifted in accordance with the key 1c as shown in the "key 1c configuration example" so that the orientation of the protective cover 1 when mounting the key 1c. And the direction of the handle 8 are uniquely determined. Thereby, since the protection cover 1 can be attached only in a positional relationship where the position of the window 1d matches the current tap position, it is possible to prevent the protection cover 1 from being attached in the wrong direction.

  In this case, when the handle 1 is provided with a key 1c groove having a shape that is not symmetrical in the vertical and horizontal directions with respect to the center of the handle 8, for example, an irregular shape or a round hole formed at a position deviated from the center. By providing a key 1c corresponding to this, the position of the window 1d can be set to a positional relationship that matches the current tap position. That is, the defining unit is not limited to the example illustrated in the embodiment, but may have another configuration as long as the window unit 1d can be defined at a position corresponding to the current tap position.

  Further, in the embodiment, the key 1c inserted into the slit 8a has been exemplified as the defining portion. However, for example, as shown in FIG. 9, the defining portion may be formed by a wall portion 1e along the outer edge of the handle 8. Specifically, by providing a wall 1e extending along the longitudinal direction to the side of the handle 8 in a plan view, and extending below the upper surface of the handle 8 in a side view, the protection cover 1 is attached. The orientation is limited to two orientations that are offset by 180 °. When the code plate 9 is provided as in the embodiment, if the direction in which the identification number is visible is selected, the current tap position can be confirmed without removing the protective cover 1. This configuration is particularly significant when the handle 8 having no key 1c groove is employed.

  In this case, for example, as shown in FIG. 10, a recess 1 f is provided at the bottom of the main body 1 a, which is closer to the handle 8 in a plan view and can accommodate at least the upper surface of the handle 8 in a side view. A configuration in which the wall portion 1e is formed may be employed. Even with such a configuration, the mounting direction of the protective cover 1 can be limited to two with respect to the direction of the handle 8, and the possibility of mounting the protective cover 1 in an incorrect direction can be reduced.

  By the way, as shown in FIG. 11, for example, it is assumed that the identifier (N) is hidden by the handle 8 in plan view. In such a case, as shown in FIG. 12, for example, a space for accommodating the code plate 9 is provided below the protective cover 1 in the drawing, and a through hole is formed in a part of the main body 1a to form the window 1d. And the identifier can be visually recognized. Alternatively, as shown in FIG. 13, by forming a window portion 1 d recessed from the flange portion 1 b to the main body portion 1 a, the identifier can be visually recognized.

  In this case, since the inner wall that accommodates the handle 8 functions as the wall 1e, it is possible to define or limit the mounting direction of the protective cover with respect to the direction of the handle. Even with such a configuration, the current tap position can be grasped and confirmed without removing the protective cover 1.

  In this case, depending on the shape of the hollow portion of the main body 1a accommodating the handle 8, the mounting direction of the protective cover 1 is limited to two directions shifted by 180 ° as described above. Can be made visible only. Thus, it is possible to prevent the protection cover 1 from being attached in the wrong direction.

  In the embodiment, the handle 8 having a substantially rectangular shape in a plan view is illustrated, but the shape of the handle 8 is not limited to this. When the handle 8 has another shape, the shape of the key 1c and the shape of the wall 1e are adjusted to the shape and position of the handle 8 so that the current tap position can be set without removing the protective cover 1. The various effects described above, such as being able to grasp and confirm, can be obtained.

  In the embodiment, the example in which the identifiers are described in one row in the circumferential direction has been described. However, when the identifiers are described in a plurality of rows, the window 1d may be provided in a plurality of rows. In this case, if the position where the identifier is written is considered to some extent, it can be made visible only through one window 1d, and it is possible to prevent the protective cover 1 from being erroneously oriented and the tap position from being erroneously recognized. The identifier may be written on the outer surface of the tank 3 instead of the code plate 9 constituting the tap changer 7.

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

  In the drawings, 1 is a protective cover, 1a is a main body, 1b is a flange, 1c is a key (specifying part), 1d is a window, 1e is a wall (specifying part), 7 is a tap changer, 8 is a handle, 8a is a slit, 9 is a code plate (mounting surface).

Claims (5)

A protective cover for protecting the handle of the tap changer,
It has a main body that covers the entire handle, and the main body can visually recognize one identifier corresponding to the current tap position among a plurality of identifiers indicating the tap positions written on the mounting surface of the handle. A protective cover for a tap changer, wherein a window portion is formed.   2. The tap changer according to claim 1, wherein the main body is provided with a defining portion that defines an attachment direction of the main body such that the window is located at an identifier position corresponding to a current tap position. Protective cover.   3. The tap changer according to claim 1, wherein the defining portion is formed by a key that can be inserted into a slit provided in the handle, or a wall portion along an outer edge of the handle. 4. Protective cover. The main body portion is formed in a bottomed cylindrical shape, a flange portion is formed on the opening side,
The window portion is formed by depressing an outer peripheral portion of the flange portion radially inward with a width corresponding to one identifier, or by forming a hole at a position corresponding to the identifier. The protective cover for a tap changer according to any one of claims 1 to 3. The main body is formed in a bottomed cylindrical shape,
The window portion is formed by depressing a part of the outer periphery of the main body portion radially inward with a width corresponding to one identifier, or by forming a hole at a position corresponding to the identifier. The protective cover for a tap changer according to any one of claims 1 to 3, characterized in that:

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