JP2682644B2 - Load tap changer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a load tap changer for a transformer, and more particularly to improvement of a tank structure thereof.

[Prior Art] FIG. 4 is a plan sectional view showing an example of a conventional tap changer during load, and FIG. 5 is a front view of FIG. In the figure, 1
Is a transformer body tank, 2 is a rectangular switch tank connected to the transformer body tank 1, and this switch tank 2
The inside of the transformer body tank 1 is filled with insulating oil. 3 is a switch body of the tap changer under load stored in the switcher tank 2, 4 is a connection terminal of the switch body 3, 5
Is a lead wire connected to the connection terminal 4, 6 is a reinforcing material attached to the outer periphery of the switch tank 2, and 7 is work formed at the four corners of the switch tank 2 for connecting the lead wire 5. It is a space.

In the conventional tap changer under load configured as described above, when assembling the tap changer under load 3 when the worker enters the work space 7 and the connecting terminal 4 is attached to the lead wire 5. Connect to.

Further, the strength of the switching device tank 2 is supplemented by the reinforcing material 6. Such a reinforcing material may be mounted in the switch tank 2.

[Problems to be Solved by the Invention] In the conventional load tap changer configured as described above, the shape of the switch tank 2 is a quadrangle in order to secure the working space 7 inside the switch tank 2. Therefore, there is a problem that the strength is weak, a large reinforcing material 6 is required, and the whole is large and expensive.

The present invention has been made to solve the above-mentioned problems, and can facilitate the work of connecting lead wires, reduce the reinforcing material, and reduce the size of the whole, which is economically superior. The purpose is to obtain a tap changer under load.

[Means for Solving the Problems] A tap changer under load according to the present invention includes a changer body to which connection terminals of a plurality of lead wires are connected, a cylindrical upper tank, and a lower portion of the upper tank. A switcher tank having a connected cylindrical lower tank and accommodating a switcher main body, and the connection terminal is connected to a portion of the switcher main body covered by the lower tank. .

[Operation] In the present invention, by making the shape cylindrical, the strength is increased and the entire size is reduced, and the switch tank is divided during the lead wire connection work.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First
1 is a plan sectional view of a tap changer under load showing an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and the same or corresponding parts as in FIG. The description is omitted.

In the figure, 11 is a cylindrical upper tank connected to the transformer main body tank 1, 12 is a cylindrical lower tank connected to the upper tank 11, and these upper tank 11 and the lower tank 12 are connected to each other. Has a first flange 11a and a second flange 12a, respectively, and the first and second flanges 11a, 12a are joined to each other by bolting or welding. Reference numeral 13 is a switch tank which is composed of an upper tank 11 and a lower tank 12 and accommodates the switch main body 3. Further, the connection terminal 4 of the lead wire 5 is connected to the portion covered by the lower tank 12 of the switching device body 3.

In the switch tank 13 configured as described above,
External pressure and internal pressure are applied to the whole when manufacturing in a factory or when operating a transformer, but since the shape is cylindrical, the strength is high and there is no risk of deformation. Also, since the normal switch body 3 has a shape in which the plane cross section is close to a circle, by making the switch tank 13 a cylindrical shape, the whole size can be made smaller than in the conventional case, so that the switch tank 13 can be filled. The amount of insulating oil used can be reduced, which is economical.

Further, as shown in FIG. 3, the work of connecting the lead wires 5 is performed with the lower tank 12 removed,
The switching device tank 13 does not require a working space and can be easily performed. Then, the lower tank 12 may be attached after the wiring work is completed.

Although the switch tank 13 is divided into two in the above embodiment, it may be divided into three or more.

As described above, in the load tap changer of the present invention, since the shape of the switch tank is cylindrical, the strength is increased, the reinforcing material can be reduced, and the overall size is reduced. This has the effect of improving the economy. In addition, since the switch tank has an upper tank and a lower tank, and the lead wire connection terminal is connected to the part of the switch body covered by the lower tank, the lower tank must be removed from the upper tank. There is also an effect that the work of connecting the lead wires can be easily performed.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a tap changer under load showing an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a front view of the changeover tank of FIG. 1 during assembly. 4 is a plan sectional view showing an example of a conventional tap changer during load, and FIG. 5 is a front view of FIG. In the figure, 3 is a switch body, 4 is a lead wire, 5 is a connection terminal, 11 is an upper tank, 12 is a lower tank, and 13 is a switch tank. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A switching device main body to which connection terminals of a plurality of lead wires are connected, a cylindrical upper tank, and a cylindrical lower tank connected to a lower portion of the upper tank. A switch tank for accommodating a switch body, wherein the connection terminal is connected to a portion of the switch body covered by the lower tank.