JPS59172218A - Tank for stationary induction electric apparatus - Google Patents

Abstract

PURPOSE:To contrive to restrain tank size and insulating oil of a tank for a stationary electric induction apparatus to the necessary minimum, and to reduce tank weight and to curtail tank manufacturing time by a method wherein at least one side of the long side side wall is constructed by connecting alternately nearly semicylindrical bushing pockets and partially cylindrical shell side walls. CONSTITUTION:A long side sidewall 26B is arranged by connecting alternately partially cylindrical shell side walls 30B of the plural number of pieces and semicylindrical bushing pockets 33 of the plural number of pieces. A tank 21 is using the nearly semicylindrical bushing pockets 33 both as reinforcing beams extending over the whole height of the tank, and is so designed as to enable to endure vacuum external pressure at insulating oil pouring time according to flexural rigidities of the reinforcing beams and the semicylindrical bushing pockets 33, and buckling strengths, flexural rigidities provided to the partially cylindrical shells 30A, 30B themselves. Moreover, the partially cylindrical shell side wall 30B makes the shell to generate horizontally directional forces R1 and vertically directional forces R2 at both the edge parts thereof according to vacuum external pressure P0. Buckling strength of the partially cylindrical shell is controlled large not only by plate thickness and the radius of curvature, but also by the state supporting directly forces R1, R2 generated at the edge parts thereof, or by the supporting condition thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to stationary induction tanks, and more particularly to improving the mechanical strength of tanks.

[Technical background of the invention and its problems]

Among stationary induction electric appliances such as transformers and accelerators, for example, a transformer is formed by storing the contents of the transformer main body and, for example, insulating oil in a transformer tank. This transformer tank must withstand the vacuum external pressure caused by evacuation when filling insulating oil and the hydraulic pressure inside the transformer tank during transformer operation. Therefore, reinforcing beams are welded and fixed to the outer peripheral side walls of the transformer tank.

The structure of a typical conventional transformer tank is shown in FIGS. 1 and 2. The winding (1), core (2), and on-load tap changer (3) inside the transformer main body are housed inside the transformer tank (4) together with insulating oil.

The transformer tank (4) is composed of a partial cylindrical shell side wall (5), a flat plate side wall (6), a cover plate (7), and a bottom plate (8). Reinforcement beams (9), C1(!l, (1,1
) are fixed by welding. Furthermore, there is a roughly semi-cylindrical bushing pocket (121 is the winding (1) inside the transformer body).
It is welded and fixed to the flat plate side walls (6) facing each other, and its lower end is connected to the reinforcing beam (9). In addition, a semi-cylindrical bushing (bushing) (12 has a bushing (1)
A dispute is established.

FIG. 3 shows the state of deformation in the vicinity of the bushing pocket 02 of the transformer tank (4) constructed in this manner when the transformer tank (4) is in vacuum. The bushing pocket (121) has an approximately semi-cylindrical shape and its base undergoes opening deformation in response to external vacuum pressure.The opening deformation of the base of 121 reduces the bending rigidity of the push song pocket 02 itself, and the flat side wall ( 6) is greatly distorted as shown by the broken line.

Therefore, the bushing pocket) (Increase the plate thickness of 12 to create a bushing pocket) (Increase the bending rigidity of 1 and 21 themselves, or create a pushing pocket) (Add a rib plate etc. to the outer periphery of 121 to create a pushing pocket) Q21 It is necessary to prevent the bending rigidity of the transformer from decreasing, which may lead to an increase in the weight of the transformer tank or an increase in manufacturing time. In addition, the insulation distance from the winding (1) inside the transformer body is reduced due to distortion around the nibbutsuing pocket (121), so it is necessary to increase the tank dimensions to secure the insulation distance. There were problems that needed to be resolved, such as an increase in the amount of insulating oil.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to reduce tank size and insulating oil to the necessary minimum, reduce tank weight, and shorten tank manufacturing time. Our purpose is to provide stationary induction tanks.

[Summary of the invention]

In order to achieve such an object, the present invention has a tank formed of mutually opposing long side walls, mutually opposing short side walls, a lid plate, and a bottom plate, and at least one side of the long side walls is formed into a substantially semi-cylindrical shape. By alternately connecting the bushing pockets and the side walls of the partially cylindrical shell, the tank size and insulating oil can be reduced to the necessary minimum, and the tank weight and tank manufacturing time can be reduced.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A stationary induction tank according to an embodiment of the present invention will be described below with reference to the drawings. Among stationary induction electric appliances such as transformers and accelerators, for example, a transformer tank will be explained. Fourth
In the figure, two windings (23) forming the contents of the transformer body inside a tank (21) and a concentric (23) winding a winding (22) are shown.
and an on-load tap changer (24), two bushings are attached, and the inside of the tank (21) is filled with an insulating medium such as insulating oil (21a).

The tank (21) has long side walls (26A) facing each other,
(26B) and the short side wall (27A) facing each other,
(27B), a lid plate (27B), and a bottom plate (tub).One long side wall (26A) is formed by a plurality of partial cylinder shell sidewalls (30
A) are continuously joined and arranged. Further, a reinforcing beam (31) is arranged and fixed at the joint between the side walls (30A) of the partial cylinder shells.

The other long side wall (26T'l) is arranged by alternately connecting a plurality of partial cylindrical shell side walls (30B) and a plurality of semi-cylindrical bushing pockets (C).

The reinforcing beam 01) and the semicircular bushing pocket (G) each have a reinforcing beam (2 pieces) welded to the lid plate (28) at their upper end, and a reinforcing beam (2 g) welded to the bottom plate (2g) at their lower end. Fixed reinforcement beam 04)
to fix.

In addition, the short side walls (27A) and (27B) are each formed into a partially cylindrical shell shape, and a reinforcing beam 01) is fixed to the long side wall (26B) of the short side wall (27A), and the short side wall (27A) is fixed to the long side wall (26B) side. The long side wall (26A) of 27A) is fixed to the partial cylindrical shell side wall (30B), and the long side wall (26B) is fixed to the semi-cylindrical bushing pocket (T).

Next, the effects of the present invention will be explained. Tank (21
), the almost semi-cylindrical bushing pocket is used as a reinforcing beam over the entire height of the tank, and the bending rigidity of the reinforcing beam and semi-cylindrical bushing pocket (g) is sufficient to withstand the vacuum external pressure when injecting insulating oil. , partial cylindrical shell (3
10A), (30B) are designed to withstand through their own buckling strength and bending rigidity.

In addition, although the semi-cylindrical bushing pocket (G) itself has high bending rigidity, due to external pressure during vacuum processing,
Its base undergoes opening deformation and its bending rigidity decreases. Furthermore, the side wall (30B) of the partial cylindrical shell is at a vacuum external pressure P, as shown in FIG. , a horizontal force R on the shell at both ends,
and generates a car in the overlapping direction. The buckling strength of a partial inner shell is determined not only by its thickness and radius of curvature, but also by the force R generated at its end.
, ,R, depends largely on the supporting conditions.

By alternately arranging the substantially semi-cylindrical bushing pocket (like the tank (21) of the present invention) and the partial cylindrical shell side wall (30B), the horizontal curve generated at the shell end of the partial cylindrical shell can be reduced. , can be offset by the force trying to open the base of the semi-cylindrical bushing pocket, and the vertical curve can be offset by the bending rigidity of the pushing pocket. Therefore, deformation of the semi-cylindrical opening is prevented, resulting in a bushing pocket.
3+ The strength of the seat between the partial cylindrical shell side walls (30B) can be increased.

〔Effect of the invention〕

As explained above, according to the stationary induction tank of the present invention, the bending rigidity of the semi-cylindrical bushing pocket itself is effectively utilized as a reinforcing material, the reinforcing beam is omitted, and buckling of the partially cylindrical shell is prevented. Improved strength makes it possible to reduce plate thickness, stabilize tank strength, and reduce weight. In addition, the deformation of each part of the tank is reduced, the insulation distance from the windings or internal leads can be minimized, and the tank dimensions can be reduced. ,
It is also possible to reduce the amount of insulation oil.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and front view of a conventional transformer tank, and Figure 3 shows the bushing pocket in Figure 1) FJ
4 and 5 are plan and front views showing the transformer tank of the present invention, and FIG. 6 is a partial explanatory diagram showing the state of deformation of the sides. FIG. 6 is a diagram showing the force generated at the end of the side wall of the partial cylindrical shell in FIG. FIG. (21)...Tank, (21a)...
Insulating oil (221...Winding, θ■...Iron core θ(A)...Tap changer on load (2 pieces...Bushing, (26A), (26B)
)... Long side wall (27A), (27B)... Short side wall (28)... Lid plate, (G)... Bottom plate (30A), (30B)... Partial cylindrical shell side wall (
3υ, 03, (34)...Reinforcement beam (T)・
...Semi-cylindrical bushing pocket agent Patent attorney Inoue - Male

Claims (1)

[Claims] In a stationary induction tank that stores the contents of the stationary induction electric device and an insulating medium inside the tank and has a bushing pocket on the side wall of the tank, at least one long side wall is provided with an approximately semi-cylindrical bushing pocket and a partial cylindrical shell. A stationary induction electric tank characterized by being constructed by alternately connecting side walls.