JP3245880B2 - Lifting device for load tap changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hoist used for lifting a load tap changer for inspection of a load change tap changer housed in a substation building of a substation. Related to the upper device.

[0002]

2. Description of the Related Art FIG. 3 is an elevation view showing a substation building in which a transformer is housed in a building, and a substation building 100 is shown in a sectional view. In this figure, a transformer 1 with a tap changer at load is installed on the first floor, and primary and secondary cables 12 drawn from the transformer 1 pass through a floor 121 and are disposed in a cable processing room on an upper floor. 120, then
Furthermore, it penetrates the floor 131 and is drawn into the switchboard room 130 on the upper floor and enters the switchboard.

[0003] The height dimension H of the substation building 100 is set at 1 to prevent the building 100 from being subject to shading regulation.
It is set within 0 m. Therefore, the substation building 100
The height of the room on each floor is also set to the minimum necessary in order to keep the height dimension H within this dimension.

[0004] The transformer room 110 has not only a height for simply installing the transformer 1 but also a load tap changer 15.
Transformer 1 to the position shown by the two-dot chain line in FIG.
It must have dimensions that allow it to be lifted from the ground.

FIG. 4 is an elevational view of a transformer room mainly including a transformer room 110 and a conventional on-load tap changer lifting device mounted on the ceiling thereof. Are denoted by the same reference numerals, and detailed description is omitted. In this figure, a load tap changer lifting device 2 under load includes a chain block 20, wheels 21 attached to the chain block 20, a ceiling of a transformer room 110 which supports the wheels and enables movement in a horizontal direction. However, it is composed of a rail 22 attached to a certain floor 121.

Inspection work of the load tap changer 15 is performed in the following procedure. That is, the on-load tap changer 15 housed in the on-load tap changer room 14 of the transformer 1
Using the chain block 20 to the position indicated by the two-dot chain line in the figure. Move horizontally to the horizontal position without transformer 1 and lower it down. Perform inspection work and repair work for defective parts. The on-load tap changer 15 is housed in the transformer 1 in the reverse order of the above.

The height dimension of the transformer room 110 required for such an operation is H ₆ in the figure, and the height dimension H ₆ is the dimension H ₁ from the floor of the on-load tap changer room 14 and the load. The height dimension H ₂ of the hour tap changer 15 and the minimum dimension H ₅ of the chain block 20 from the ceiling must be equal to or greater than the sum.
The approximate values of these dimensions are H ₁ = 3000 mm, H ₂ =
1200 mm, H ₅ = 600 mm, and the total value of H ₄ is about 5 m, and the height H ₆ of the transformer room 110 is generally
Is usually designed to be 5 m or less. The height of the cable processing chamber 120 is about 2 m, and the height of the switchboard room 130 is about 3 m. Switchboard room 13
The height of 0 is determined from the height of the switchboard, and the cable processing chamber 120 is determined as a dimension that allows an operator to stand upright during cable wiring and connection work. The floor 12
The thickness of 1,131 is about 200 mm.

For example, the capacity of the transformer 1 is large and the aforementioned H ₁
If the height of the transformer room 110 becomes large for some reason, such as larger than the value of
Height of the substation building 100
It is common to set it within m. Cable processing room 12
The work in the area 0 is a temporary work when the transformer 1 is installed, so that the work in the cable processing room can be kept within the size limit even if the workability is sacrificed to some extent.

FIG. 5 is an elevational view of a transformer room mainly including a conventional lifting device different from FIG. 4 attached to the ceiling of the transformer room 110. In the configuration of FIG. 4, the height of the substation building 100 is increased. When the height H becomes excessively large and cannot be dealt with by reducing the height of the cable processing room 120, the chain block 20 is mounted on the ceiling of the cable processing room 120 in order to make the height of the transformer room as small as possible. Things. Those having the same height dimensions as those in FIG. 4 are denoted by the same reference numerals. In this figure, the rail 22 is connected to the cable processing chamber 12.
It is attached to the floor 131 which is also the ceiling of
1 is a through hole 12 such that the on-load tap changer 15 is lifted from the transformer room 110 to the cable processing room 120.
2 are provided.

[0010] When a work such as inspection of load tap changer 15 performs a cable processing chamber 120, the size H ₇ between the load tap changer chamber 14 and the floor 121 may be small. Therefore, the transformer room 11 which is the sum of the dimensions H ₁ and H ₇
Height H ₈ 0 may be at least the size H ₅ minutes of the chain block 20 smaller than in FIG. On the other hand, the height H ₉ Cable processing chamber 120 becomes the sum of the dimension H ₅ dimensions H ₂ and chain block 20 of the load tap changer 15, the H ₉ Applying the dimensions of the aforementioned 180
It becomes 0 mm and just enters the height of the cable processing chamber 120.
Therefore, the height dimension of the substation building 100 is
10 is reduced by the reduced height.

In this method, when the on-load tap changer 15 is lifted in the cable processing chamber 120, a plate or the like is laid on the through-hole 122, and the on-load tap changer 15 is mounted thereon for inspection. Therefore, the through-hole 122 may be passed through when the load tap changer 15 moves in the vertical direction. Since the diameter of the load tap changer 15 is about 700 mm, the diameter of the through hole 122 is about 1 m.

[0012] The load tap changer 15 without lifting up the cable processing chamber 120, stopping the lifting to a position indicating the size of the H ₇ figures, the transformer chamber 110 moves horizontally in the height direction position floor In the method of lowering to 111, the chain block 20 and the wire move horizontally in the cable processing chamber 120, but such a horizontal movement is actually caused by the cable routed in the cable processing chamber 120. It is impossible.

[0013]

As described above, in order to reduce the height of the substation building 100, the method of mounting the chain block 20 on the ceiling of the cable processing room is as follows.
A region for work such as inspection is required around the through hole 122, and a cable cannot be routed in this region.
For this reason, there is a problem that the arrangement of cables in the cable processing chamber 120 is restricted. Further, in the case of performing work such as inspection of the load tap changer 15, there is a problem that workability is poor because the height dimension of the cable processing chamber 120 is low, and workability such as inspection is significantly impaired.

An object of the present invention is to solve such a problem, to reduce the height of a substation building, to reduce the influence on cable routing in a cable processing room, and to inspect a load tap changer. It is an object of the present invention to provide an on-load tap changer lifting device capable of performing the above operation in a transformer room as in the past.

[0015]

According to the present invention, there is provided a transformer room in which a transformer with a tap changer at load is installed, and a floor above the floor where the transformer room is provided. Is installed in the substation building equipped with a cable processing room for processing the cable drawn from the transformer with the tap changer at the time of loading, and is movable horizontally by fixed rails and wheels. In the lifting device of a load tap changer comprising a chain block of
A through hole is provided in a floor that separates the transformer room and the cable processing room, and a lifting seat that covers the through hole and projects from the floor to the cable processing room is provided. And the lifting seat also serves as a strength beam for the floor, or the lifting seat is mounted on the floor by bolts.

[0016]

In the construction of the present invention, a through hole is provided in the floor of the cable processing chamber, a lifting seat is provided which covers the through hole and projects from the floor to the cable processing chamber by a predetermined height, and a chain is provided on the back surface of the projecting portion of the lifting seat. When the rail that moves the block in the horizontal direction is installed, the mounting position of the chain block is higher than the case where it is mounted on the ceiling of the transformer room by the sum of the size of the protrusion of the lifting seat and the thickness of the floor described above. The height of the transformer room can be reduced by the increased dimension. Since the size of the protrusion of the lifting seat is a fraction of the height of the cable processing chamber, the influence on the cable routing is small. Work such as inspection of the tap changer under load can be performed by lowering the work on the floor of the transformer room, so that workability does not deteriorate.

[0017] Further, by using a structure in which the lifting seat also serves as the floor's strength beam, it is possible to reinforce the decrease in the floor's beam strength due to the provision of the through holes.

Alternatively, when the floor has sufficient beam strength even if the through holes are provided, the structure of the lifting seat can be simplified by simply attaching the lifting seat to the floor by bolting, and the lifting seat can be simplified. Can be easily removed when it is unnecessary or obstructed for some reason.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is an elevational view of mainly a transformer room including a lifting device 2A of a tap changer under load, showing an embodiment of the present invention. The same components as those in FIG. Detailed description is omitted. In this figure, a lifting seat 23 projecting into the cable processing chamber 120 is provided so as to cover a through hole 122A provided in the floor 121, and a rail 22A is attached to the rear surface of the projecting portion of the lifting seat 23.

Since the height H ₄ of the lifting seat 23 from the lower portion of the floor 121 is set to a size H ₅ corresponding to the minimum height of the chain block 20, the chain block 20 has a height H _5.
Is independent of the height dimension H ₃ of the transformer room 110, and this dimension H ₃ is the height H from the floor of the on-load tap changer room 14.
₁ and the sum of the dimensions of H _2-load tap changer 15.
Therefore, it is possible to minimize H ₅ as compared with the transformer chamber 110 of Figure 4.

The lifting seat 23 protrudes from the cable processing chamber 120, but since there is a margin between the lifting seat 23 and the floor 131, cables such as routing and connection in the cable processing chamber 120 are provided. It does not hinder the work. Since the thickness of the floor 121 is 200 mm, the protrusion dimension of the lifting seat 23 from the upper surface of the floor 121 is 400 mm. In the figure, the dimension is illustrated as being at least half the height of the cable processing chamber 120, but in practice it is at most about one-fourth. Further, the width dimension may be such that the chain block 20 is inside, so that about 400 mm is sufficient.

The protrusion of the lifting seat 23 of 400 mm into the cable processing chamber 120 is not completely unaffected by the arrangement of the cables, but it is much less than that of FIG. .

The provision of the through-hole 122A is the same as that of the prior art shown in FIG. 5, but the lifting seat 23 also serves as a reinforcing beam for the floor 121, so that a reduction in beam strength due to the provision of the through-hole 122A is compensated. It has become. The lifting seat 23 is secured to a beam (not shown) of the floor 121 by welding to secure a mechanical strength sufficient to compensate for a decrease in beam strength.

FIG. 2 is an elevational view mainly of a transformer room including a lifting device 2B showing another embodiment of the present invention. The same components as those in FIG. Description is omitted. In this figure, the lifting seat 23B is mounted on the floor 121 by mounting bolts 24. This is a through hole 12
In this case, the lowering of the beam strength of the floor 121 due to the provision of the 2A does not substantially matter. In such a case, if the mounting of the lifting seat 23B is made to be removable by bolting, the lifting seat 23B Can be removed when unnecessary or when it becomes an obstacle to work in the cable processing chamber 120.

[0025]

As described above, according to the present invention, a through hole is provided in the floor of the cable processing chamber, a lifting seat that covers the through hole and protrudes from the floor to the cable processing chamber is provided, and a rail is provided on the rear surface of the protrusion of the lifting seat. The height dimension of the transformer room can be reduced by the height of the lifting seat as compared with the case where the rail is mounted on the ceiling of the transformer room. If the lifting dimension of the hoisting seat from the floor is the minimum size of the chain block, only the chain block will fit in the hoisting seat, so its width may be small, and the height of the transformer room shall be the minimum of the chain block. The effect that the size can be reduced by the dimension can be obtained. In addition, the projecting dimension of the lifting seat from the cable processing room is a fraction of the height of the cable processing room, so there is no significant effect on the cable layout, and workability is sacrificed to reduce the height of the substation building. Therefore, it is not necessary to reduce the height of the cable processing room. In addition, work such as inspection of the tap changer under load is performed by lowering the work on the floor of the transformer room, so that workability does not deteriorate.

In addition, by making the lifting seat also serve as a floor beam, it is possible to reinforce the floor beam strength drop due to the provision of the through holes.

Alternatively, if the beam strength of the floor is sufficient even if the through holes are provided, simply mounting the lifting seat to the floor by bolting simplifies the structure of the lifting seat and eliminates the need for the lifting seat. Or, when it is in the way for some reason, it can be easily removed.

[Brief description of the drawings]

FIG. 1 is an elevation view of a lifting device of a tap changer under load and mainly a transformer room showing an embodiment of the present invention.

FIG. 2 is an elevational view of a lifting device and mainly a transformer room showing another embodiment of the present invention.

FIG. 3 is an elevation view showing a substation building in which a transformer is housed in a building.

FIG. 4 is an elevation view of a conventional lifting device and mainly a transformer room.

FIG. 5 is an elevational view of a conventional lifting device different from FIG. 4 and mainly of a transformer room;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Substation building 110 Transformer room 120 Cable processing room 130 Switchboard room 121 Floor 131 Floor 122 Through hole 122A Through hole 1 Transformer 12 Cable 14 Tap changer room at load 15 Tap changer at load 2 Lifting device 2A Lifting Device 2B Lifting device 20 Chain block 21 Wheel 22 Rail 22A Rail 23 Lifting seat 23B Lifting seat 24 Mounting bolt

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 29 / 02,29 / 04 B66C 7/04 B66D 3/16 E04H 5/04

Claims (3)

(57) [Claims] 1. A transformer room in which a transformer with a tap changer at load is installed, and a transformer room provided on a floor above the floor where the transformer room is provided and drawn from the transformer with a tap changer at load. A lifting device for a tap changer under load, which is provided in a substation building having a cable processing room for processing a cable, and comprises a fixed rail and a chain block movable horizontally by wheels. A through hole is provided in a floor that separates the transformer room and the cable processing room, and a lifting seat that covers the through hole and projects from the floor to the cable processing room is provided.The rail is provided on the back surface of the protrusion of the lifting seat. A lifting device for a tap changer under load, which is mounted. 2. The lifting device for a tap changer under load according to claim 1, wherein the lifting seat also serves as a floor strength beam. 3. The lifting device for a load tap changer according to claim 1, wherein the lifting seat is attached to the floor by bolts.