JPH0331064Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tap insulator mounting structure for an oil-immersed transformer.

The structure of a conventional oil-immersed transformer is shown in FIGS. 1 and 2. FIG. 1 is a front view, and FIG. 2 is a side view of what is shown in FIG.

In the oil-immersed transformer shown in Figs. 1 and 2,
1 is a wound core, 2 is a winding engaged with the wound core 1, and 3
is a U-shaped sling that holds the wound core 1 along the outer circumferential surface of the wound core 1, 4 and 5 are L-shaped angles that tighten and fix both ends of the sling 3 with bolts 6, and 7 is a left and right L-shaped angle. L connecting and fixing between 4 and 5 in an H shape
8 is a press board installed between the upper surface of the wound core 1 and the lower surface of the L-shaped angle 7; 9 is a stud connecting the L-shaped angle 7 and the cover 10;
11 is a tap insulator stand installed on the L-shaped angle 7 via a pedestal 12. The pedestal 12 is for keeping the tap insulator stand 11 at a high position in order to facilitate tap switching work. Since the tap switching operation is performed by inserting a hand into the tank, it is preferable that the tap insulator stand 11 be placed as close to the oil level as possible.
The cover 10 suspends the contents of the transformer, including the wound core 1, the winding 2, etc., by means of a stud 9 and a U-shaped sling 3 fixed to the stud 9 at both ends. Therefore, when the cover 10 is lifted upward, the entire contents of the transformer, including the wound core 1 and the winding 2, are exposed to the outside of the tank 13. In addition, 14 in the drawing
1 is a winding support, and 15 is a lower clamp. 26 is a tightening band.

In the oil-immersed transformer shown in FIGS. 1 and 2, three L-shaped angles 4, 5, 7 and a pedestal 12 are required to install the tap insulator pedestal 11, which requires a large number of parts and a long assembly time. had such drawbacks.

The present invention was developed in view of these technical shortcomings, and aims to simplify the mounting structure of the tap insulator stand, reduce the number of parts, shorten the assembly time, and reduce the cost.

The configuration of the tap insulator mounting structure for an oil-immersed transformer according to the present invention that achieves this purpose is to apply a U-shaped sling along the outer circumferential surface of a wound core that engages a winding, and to attach a U-shaped sling to both upper ends of the sling. In an oil-immersed transformer in which the wound core and the winding are supported in a tank by connecting the wound core to the cover of the transformer, a flat plate with an attachment allowance is placed above the wound core at the bent portion formed by folding both ends. A tap insulator is installed on the flat plate between the above-mentioned slings at the position of , while one end is fixed to the sling through bolts together with the mounting allowance, and the other end is fixed to the tank. The tank is characterized by having a steady rest that comes into contact with the tank to provide reinforcement between the sling and the tank.

An embodiment of the tap insulator stand mounting structure according to the present invention will be described with reference to the drawings.

3 and 4 are a front view and a side view of the tap insulator stand mounting structure according to the present invention. In Figures 3 and 4, 1 is a wound core, 2 is a winding wire, 8 is a press board, 10 is a cover, 11 is a tap insulator stand, 13 is a tank, 14 is a winding support, and 15 is a lower clamp. , these are not particularly different from the conventional one shown in FIG. In the present invention, a U-shaped sling 21 made of a thin steel plate is extended around the outer periphery of the wound iron core 1 to close to the cover 10, and both upper ends of the sling 21 are attached to the lower ends of a fixture 22 fixed to the cover 10. In addition, a flat plate 23 with an attachment allowance 23a provided at a bent portion formed by folding both ends,
Hanging belt 21 surrounding and hoisting the winding core 1
In addition, the wound core 1 is fixed with bolts 24 so as to bridge the suspension bands 21 near the upper end thereof.

The tap insulator stand 11 is installed on this flat plate 23.
The attachment position of the flat plate 23 to the sling 21 is set at approximately the midpoint W between the fixed end Y of the cover attachment 22 and the contact point X between the wound core 1 and the sling 21. 25 is a steady rest attached to the sling 21 together with the flat plate 23. Note that the tightening band 26 is a band that tightens the wound core, and runs along the outer peripheral surface of the sling 21 at the lower part, but enters inside the sling from the middle at the upper part.

The detailed shape of the flat plate 23 is shown in FIG. In FIG. 5, reference numerals 23a and 23a are mounting allowances for fixing the flat plate 23 to the sling 21 with bolts 24.
The steady rest 25 is composed of a U-shaped flat plate, and when the mounting allowance 23a of the flat plate 23 is fixed to the sling 21, the steady rest 25 is also fixed to the sling 21, and the other end of the steady rest 25 is fixed to the tank 13. It is designed to be in close contact with each other.

According to the tap insulator stand mounting structure according to the present invention shown in FIGS. 3 and 4, the installation structure of the tap insulator stand 11 is extremely simplified, so there are fewer assembly parts, the assembly time is shortened, and workability is improved. I'm getting better. In addition, even if the sling 21 is bent due to lateral vibration of the transformer, the fixed point Y of the sling 21 and the fixture 22
Since the flat plate 23 and the steady rest 25 are located approximately at the center point W between the contact point X between the sling 21 and the wound core 1, the deflection of the sling 21 can be effectively suppressed.

As explained above, the tap insulator stand mounting structure of the present invention has fewer parts and reduces cost.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional oil-immersed transformer, Fig. 2 is a side view of the one shown in Fig. 1, Fig. 3 is a front view showing the tap insulator stand mounting structure according to the present invention, and Fig. 4 is a FIG. 5 is a side view of what is shown in the figure, and FIG. 5 is a perspective view of the flat plate. In the drawing, 1 is the wound core, 2 is the winding wire, 8
10 is a press board, 10 is a cover, 11 is a tap insulator stand, 13 is a tank, 21 is a sling, 22 is a fixture, 23 is a flat plate, 23a is an attachment, 24 is a bolt, and 25 is a steady rest.

Claims (1)

[Scope of utility model registration request] A U-shaped sling is placed along the outer circumferential surface of the wound core that engages the winding, and both upper ends of the sling are connected to the cover of the transformer to support the wound core and the winding in an oil-filled tank. In the transformer, a flat plate with mounting allowance provided at the bent portion formed by folding both ends is bridged between the suspension bands at a position above the wound core, and a tap insulator stand is installed on the flat plate. , one end is
A tap insulator stand mounting structure characterized by having a steady rest that is fixed to the sling via bolts together with the mounting margin, and whose other end abuts against the tank to provide reinforcement between the sling and the tank. .