JPS59169115A - Tank for stationary induction electric apparatus - Google Patents

Abstract

PURPOSE:To minimize the size of tank and use of insulation oil, reduce a weight of tank and curtail the tank manufacturing time by fixing a cylindrical bushing pocket to the tank side walls opposing each other between the coils within the tank before assembling and by providing a lead connection aperture to the corresponding location of the coil extending lead. CONSTITUTION:A cylindrical bushing pocket 33 is connected to a reinforcing beam 31 of a cover plate 28 at the upper end, while to a reinforcing beam of bottom plate 29 at the lower end, respectively and then a bushing 24 is provided. Moreover, a lead connecting aperture 25 is provided to the corresponding location of the extending lead 23a of coil 23 and is connected to the extending lead 23a through the middle part in the oil and connecting aperture 35 of the bushing 24. The cylindrical bushing pocket 33 is partitioned at the lower side of lead connecting aperture 35 by a partitioning plate 36 and the hollow part 36a formed at the lower part is not filled with the insulation oil. Since the cylindrical bushing pocket 33 is also used for tank 21 and the reinforcing beam of side wall of flat plate 27 at the entire height thereof, sufficiently large bending rigidity can be obtained and stable regidity can also be ensured as compared with that of reinforcing beam 30 of ordinary side wall 27 of flat plate.

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 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. For this reason, a reinforcing beam is welded and fixed to the outer peripheral side wall of the transformer tank.

The structure of a typical conventional transformer tank is shown in FIGS. 1 and 2. The winding (1), iron IC (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) consists of a partial cylindrical shell side wall (5), a flat plate side wall (6), a cover plate and a bottom plate (8). A reinforcing beam (9), Cl0) and αυ are fixed to each of the parts 8) by welding. Further, a substantially semi-cylindrical bushing pocket 0a is welded and fixed to the flat plate side wall (6) facing between the windings f1) in the transformer main body, and its lower end is connected to the reinforcing beam (9). Note that the bushing side is attached to the semi-cylindrical bushing pocket α.

FIG. 3 shows the state of deformation in the vicinity of the bushing pocket α of the transformer tank (4) constructed in this manner when the transformer tank is in vacuum. The base of the semi-cylindrical push-sink pot αa undergoes opening deformation in response to external vacuum pressure. The base opening deformation of the bushing pocket αa is the bushing pocket (12
The bending rigidity of 1 itself is lowered, and the flat plate side wall (6) is greatly deformed as shown by the broken line.

Therefore, increase the thickness of the bushing pocket H to increase the bending rigidity of the bushing pocket (13), or add a lip plate or the like to the outer periphery of the bushing pocket (Oz) to prevent a decrease in the bending rigidity of the bushing pocket (13). This may lead to an increase in the weight of the transformer tank or an increase in the manufacturing time.In addition, the windings inside the transformer body due to distortion around the LD (butching pockets)
In order to reduce the insulation distance with [), it was necessary to increase the size of the tank to ensure the insulation distance, and there were also problems that needed to be solved, such as an increase in the amount of insulating oil.

OBJECTS OF THE INVENTION The present invention has been developed in consideration of the above points, and its purpose is to suppress tank dimensions and insulating oil to the necessary minimum, reduce tank weight, and reduce tank manufacturing time. An object of the present invention is to provide a stationary induction tank that can be shortened.

[Summary of the Invention] In order to achieve the above object, the present invention fixes a cylindrical bushing pocket having a length approximately equal to the height of the tank to the side wall of the tank facing between the windings in the main body of the stationary induction electric device. By assembling the winding leads L and CL' of the cylindrical bushing pocket, the tank size and insulating oil can be kept to the minimum necessary, and the tank weight can be reduced. and the reduction in tank production time as a percentage.

Embodiment of the Invention] A static induction tank according to an embodiment of the invention will be described below with reference to the drawings. Among stationary induction electric appliances such as transformers and accelerators, for example, two transformer tanks will be explained. Fourth
In the figure, the winding (
c) and the on-load tap switching device (c), and also attach the bushing (2) to the tank (2I).
I) Fill the interior with an insulating medium such as insulating oil (21a).

This tank (21) is composed of a partial cylindrical shell side wall (c), a flat plate side wall Qη, a lid plate t2al, and a bottom plate. And the flat plate side wall (5), the lid plate (to), and the bottom plate C! A reinforcing beam (to), pit, and clz are each fixed to 111 by welding. In addition, divide the tank (cylindrical bushing pocket (to) with approximately the same length as the height of 2υ into the flat plate side wall c27) on one side facing between the adjacent windings (c) and push it into this. It will stick firmly.

The cylindrical bushing pocket (to) has a cover plate (2) at the upper end.
The bushings (24) are connected to the reinforcing beams T34) of the barrel and the reinforcing beams C32+ of the bottom plate at their lower ends. Furthermore, as shown in FIG. 6, two lead connection openings (two groups) are provided at positions corresponding to the outlet leads (23a) of the winding (C), and the oil-immersed end of the bushing (24) and this connection opening G9 are provided. The cylindrical bushing pocket (to) is separated by a partition plate (to) on the lower side of the lead connection opening (to).
A hollow part (36) formed in the lower part of this partition plate (36)
A) is hollow and does not contain insulating oil.

Next, the effects of the present invention will be explained. The cylindrical bushing pocket G is the tank (21), and the total height (reinforcement beam of the flat plate side wall (27) is dual-purpose C1/. Since it is proportional to the power of It can be reduced to a minimum, no auxiliary reinforcing beams are required, and the tank (2
1) Weight can be reduced and tank manufacturing time can be shortened.

〔Effect of the invention〕

As explained above, according to the stationary induction electric tank of the present invention, there is no need to determine the insulation distance between the internal windings and the tank wall in consideration of the deformation of the tank side wall as in the conventional case.
Tank dimensions and insulating oil can be reduced to the necessary minimum, and tank weight and tank manufacturing time can be shortened.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and a front view showing a conventional transformer tank, Figure 3 is a partial explanatory diagram showing the distorted state around the bushing pocket in Figure 1, and Figures 4 and 5 are A plan view and a front view showing the transformer tank of the present invention, FIG.
It is a top view of the tonneau along line M-11 in the figure. Cυ...Tank (2La)...Insulating oil (
Two... Iron core (c)... Winding wire (23
a)...Outlet lead (24)...Bushing (c)...Tap switching device under load (2G)...Partial cylindrical shell side wall (27)...Flat plate side wall (2→...lid Board kan...Bottom board ■, o
i+, (3z...-Reinforcement beam link...Cylindrical bushing pocket I39...Lead connection opening (G)...Partition plate (36a)...Hollow part Agent Patent attorney Inoue - Power tube 1 Figure 2 Figure 3 @ 1/-\ , r-\ Figure 4

Claims (1)

[Claims] In a stationary induction electric tank in which a bushing pocket is arranged on the side wall of the tank facing between the windings in the main body of the stationary induction electric appliance, a cylindrical bushing pocket having a length substantially equal to the height of the tank is arranged so as to divide the side wall of the tank. A stationary induction electric equipment tank, characterized in that it is fixedly assembled and a lead connection opening is provided at a position corresponding to the winding lead of the cylindrical bushing pocket.