JPS616812A - Tank of stationary induction electrical appliance - Google Patents

Abstract

PURPOSE:To control the size of inside measurement of a tank and the amount of insulation oil to the min. of need and to decrease weight and size of packaging form for transportation by a method wherein a reinforcing beam whose upper side is formed horizontally is welded and adhered to a dome shaped cover in a transformer tank which consists of the dome shaped cover, vertical side-structure and a bottom plate. CONSTITUTION:A transformer tank 2, which houses a transformer body 1 and insulating oil, is constituted by a dome shaped cover 3 and a lower tank 4 which is consisted of a vertical side-structure 5 and a bottom plate 6. A reinforcing beam 7 whose upper side is formed horizontally is welded and adhered to the dome shaped cover 3 and the reinforcing beam 8, 9 are welded and adhered respectively to the vertical side-structure 5 and the bottom plate 6 which constitutes the lower tank 4. The reinforcing beam 7, 8, 9 are connected each other through a frange or directly. The dome shaped cover 3 on which the reinforcing beam 7, whose upper side is formed horizontally, is welded and adhered suppresses its deformation widely against the vacuum external pressure at oiling by stiffness at corner section of the reinforcing beam 7 where provides large area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a stationary induction tank particularly designed to improve the mechanical strength of the tank.

[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 body and, for example, insulating oil in a transformer tank. There is. This transformer tank must withstand the vacuum external pressure caused by evacuation when insulating oil is injected and the hydraulic pressure inside the transformer tank during transformer operation.

Therefore, a reinforcing beam is fixed to the outer peripheral wall of the transformer tank by welding.

The structure of a typical conventional transformer is shown in FIGS. 5 and 6. The transformer main body contents 1 are housed inside a transformer tank 2 together with insulating oil. The transformer tank 2 is composed of a dome-shaped cover 3 and a lower tank 4 consisting of a vertical wall 5 and a bottom plate 6. Reinforcement domes 7.8.9 are fixed to the dome-shaped cover 3, the vertical side wall 5, and the bottom plate 6 by welding, respectively, and the lower end of the reinforcing beam 8 welded to the vertical side wall 5 is fixed to the bottom plate 6. Both ends of the reinforcing beam 9 fixed by welding are fixedly connected by welding, and the upper end is connected to both ends of the reinforcing beam 7 fixedly welded to the dome-shaped cover 3 via seven runci.

The bushings 10Δ and IOB are attached to bushing pockets 1 to 11A and 11B protruding from the cover 3. Further, the cooler 12 is disposed on the side wall of the transformer tank 2, and the conservator 13 is attached to the cover 3 via a support metal fitting 14.

In the transformer constructed in this way, the deformation of the tank 2, especially around the dome-shaped cover 3, due to the vacuum external pressure during insulating oil injection is shown by the two-dot chain line △ in FIG. That is, the amount of bulging deformation of the top portion of the dome-shaped cover 3 and the amount of concave deformation of the side wall 5 are greatly influenced by the bending rigidity of the reinforcing beam 7 welded and fixed to the dome-shaped cover 3.

Therefore, in order to secure the insulation distance between the transformer main body contents 1 and the peripheral wall of the transformer tank 2, it is necessary to increase the internal dimension of the tank or to increase the reinforcing beam 7 welded to the dome-shaped cover 3.
This may result in an increase in the amount of insulating oil or the weight of the transformer tank. Furthermore, the dimensions and heights of the transformer constructed in this way in the state of transportation are determined by the inner dimensions of the transformer tank 2, the height of the reinforcing beams 7 welded to the dome-shaped cover 3, and the heights of the reinforcing beams 7 welded to the bottom plate 6. 6, which is the sum of the heights of the fixed reinforcing beams 9, and an increase in the bending rigidity of the reinforcing beams 7 welded to the dome-shaped cover 3 leads to an increase in the height of the package for transportation. , there is a risk that it may become impossible to transport.

[Purpose of the Invention] The object of the present invention is to provide a stationary induction electric appliance that can reduce tank internal dimensions and insulating oil to the necessary minimum, reduce tank weight, and compress transport packaging size and height. The goal is to provide a tank.

[Summary of the Invention] The stationary induction electric tank according to the present invention is a transformer tank consisting of a dome-shaped cover, a vertical side wall, and a bottom plate, and is characterized in that a reinforcing beam whose upper side is horizontal is fixed to the dome-shaped cover by welding. That is.

[Embodiments of the Invention] An embodiment of the present invention will be described below with reference to FIG. 1 showing a transformer tank.
This will be explained with reference to FIGS. 2 and 3.

First, in the embodiment shown in FIG. 1, the transformer tank 2 which houses the transformer main body contents 1 and insulating oil therein consists of a lower tank 4 consisting of a dome-shaped cover 3, a vertical side wall 5 and a bottom plate 6.
It is made up of. A reinforcing beam 7 having a horizontal upper side is welded and fixed to the dome-shaped cover 3, and reinforcing beams 8.9 are welded and fixed to the vertical side wall 5 and bottom plate 6, respectively, which constitute the lower tank 4. Each reinforcement beam 7
, 8.9 are connected via flanges or directly.

Next, the effects of the present invention will be explained. The dome-shaped cover 3 has a reinforcing beam 7 whose upper side is horizontally formed and fixed by welding, and due to the rigidity of the corner part having a wide area of the reinforcing beam 7, its deformation is greatly suppressed by the vacuum external pressure during oil filling. Ru. The deformation situation with respect to the vacuum external pressure is shown by the broken line B in FIG. If the bending rigidity of the uppermost part of the reinforcing beam 7 welded to the dome-shaped cover 3 is the same as that of the conventional type, the amount of deformation can be suppressed to about 60%. Therefore, the bending stiffness of the beam is roughly proportional to the cube of the beam height, so if the same amount of deformation is allowed, the beam height can be reduced by approximately 20
% compression. Therefore, it becomes possible to compress the size and height H of the transportation package.

FIG. 2 is a schematic sectional view of a transformer showing another embodiment of the present invention. A reinforcing beam 7 with a horizontal upper side is welded to the dome-shaped cover 3 and connected to reinforcing beams 8.9 welded to the vertical side wall 5 and bottom plate 6 of the lower tank 2, respectively. has been done. The support hardware 14 that roughly supports the conservator 13 is connected to the dome-shaped cover 3.
The reinforcing beam 7 is extended over the entire length of the reinforcing beam 7, and is removably fixed by bolting. In response to the vacuum external pressure during lubrication in a transformer configured in this way, the bending rigidity of the reinforcing beam 7 fixed to the dome-shaped cover 3 and the supporting hardware 14 of the conservator 13 is relaxed.
The amount of deformation can be significantly reduced, and by removing the supporting metal fittings 14 of the conservator 13 during transportation, it is possible to significantly reduce the actual size and height H of the package for transportation.

FIG. 3 is a schematic sectional view of a transformer showing still another embodiment of the present invention. The upper side of the dome-shaped cover 3 is formed horizontally, and reinforcing beams 7Δ, 7B separated at the top are welded and fixed, and the supporting hardware 14 of the conservator 13 is attached to the upper surface of the beam 7A, 7B. It is extended to the end face of 7B,
It is removably fixed with bolts. In the transformer configured in this way, when evacuation is performed during lubrication, the supporting hardware 14 of the conservator 3 and the reinforcing beams 7A and 7B, which are welded and fixed to the dome-shaped cover 3, are interconnected and act as reinforcing members. act and suppress deformation. Therefore, during transportation, the actual transportation dimension and height H can be further reduced by disassembling and shipping the supporting hardware 14 of the conservator 13 separately.

[Effects of the Invention] As explained above, according to the stationary induction tank of the present invention, it is not necessary to determine the insulation distance between the contents of the transformer body and the tank wall in consideration of the deformation of the tank side wall. In addition, the size of the tank and the insulating oil can be suppressed to the necessary minimum, and the transportable capacity of the stationary induction electric appliance can be increased by compressing the size and height of the transportation package.

In addition, when assembling stationary induction electric equipment, a stable work space can be secured by welding the dome-shaped cover and setting a scaffolding board on the horizontal upper side of the reinforcing beam, which can greatly improve work efficiency. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a stationary induction tank according to the present invention, FIGS. 2 and 3 are sectional views showing other different embodiments of the present invention, and FIG. 4 is a sectional view of a transformer tank. FIGS. 5 and 6 are cross-sectional views showing the conventional transformer structure. 1... Contents of the transformer body 2... Transformer tank 3... Cover 4... Lower tank 5... Side wall 6... Bottom plate 7.8.9... Reinforcement beams 10A, 10B. ...Bushing 11A, IIB...Bushing pocket 12...
Cooler 13...Conservator 14...Support hardware agent Patent attorney Yoshiaki Inomata (1 idiot) 1st
Figure 2 Figure 3 Figure q Figure 4

Claims (3)

[Claims] (1) A reinforcing structure in which the contents of the stationary induction electric device and an insulating medium are housed inside, and the reinforcing beams welded to the side walls in the axial direction are connected to the reinforcing beams welded to each of the cover plates. A stationary induction electric tank characterized in that the lid plate is configured in a dome shape, and a reinforcing beam having a horizontal upper side is welded and fixed to the dome-shaped lid plate. (2) A patent characterized in that a reinforcing beam with a horizontal upper side is welded and fixed to a dome-shaped lid plate, and a support beam for a conservator, etc. is removably fixed to the upper surface of the reinforcing beam with bolts, etc. A stationary induction electric tank according to claim 1. (3) A reinforcing beam is welded and fixed to the dome-shaped cover plate, which is separated at the top and whose upper side is horizontal, and a support beam for a conservator, etc. is attached to and detached from the upper surface of the reinforcing beam using bolts, etc. A stationary induction tank according to claim 1, characterized in that the tank is capable of being fixed.