JPS584175Y2 - molded transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a molded transformer in which a high voltage molded winding is concentrically arranged outside a low voltage molded winding.

1 to 3 show a conventional three-phase molded transformer, in which 1 is an iron core having three legs 1a to 1C, and 2 is a joint that tightens the yoke of the iron core 1. It is an iron fastening fitting.

A low-voltage molded winding 3 and a high-voltage molded winding 4' are fitted concentrically into the legs 1a to 1C, respectively, and each winding is inserted between the upper and lower ends of the winding and the yoke clamping fitting 2. It is positioned in the axial direction by a winding holding insulator 5.

As shown in FIG. 2, the high-voltage molded winding 4' is a high-voltage winding 8' having winding end terminals 6', 6' led out from both ends in the axial direction and a tap changer 7' provided in the middle. are molded with synthetic resin, and the winding end terminals 6', 6' and the terminals 7a', 7b' of the tap changer 7' are integrally attached to the outer surface of the synthetic resin molded part. The upper and lower winding terminals 6' are disposed on the winding end terminal arranging protrusions 9', 9' and the tap changer arranging protruding parts 10'.
6' are interphase connecting members 1 by connecting rods 11 and 12, respectively.
Connected to 3.

The interphase connection member 13 is formed by integrally molding a plurality of lead wires 13a with resin into a strip shape, and the interphase connection member 13 connects the windings of each phase to a predetermined connection (in the illustrated example, a triangular connection method is used). ).

In the conventional molded transformer described above, protrusions 9', 9' for arranging winding end terminals are provided at the upper and lower parts of the high-voltage molded winding 4', respectively.
Since there are connection rods 11 and 12 between the two protrusions, the tap changer mounting protrusion 10' is placed at the winding end so that the tap changer 7' does not come into contact with the connection rods. It is arranged at a position shifted in the circumferential direction from the position of the terminal arrangement protrusions 9', 9'.

However, if the protruding parts 9', 9' and the protruding part 10' are made to protrude in different directions, the external shape of the high-voltage molded winding becomes complicated, and a complicated casting mold is required, which increases the cost. was there.

Furthermore, when the diameter of the high-voltage molded winding is large, the curvature of the outer circumferential surface of the winding is small. Since the casting mold can be made to protrude in approximately the same direction, the casting mold can be divided into two parts. However, when the diameter of the high-pressure mold winding is small, the curvature of the outer circumferential surface of the winding is large, so the protruding part In order to arrange the protrusions 9' and protrusions 10' side by side in the circumferential direction, both protrusions must protrude in the radial direction as shown in FIG. 3, so the mold cannot be divided into two parts. It was inevitable that the mold structure would become extremely complex.

Furthermore, it is necessary to secure space for arranging the protrusions 9', 9' for arranging the winding end terminals and the protrusion 10' for arranging the tap changer, so the height of the winding is not made too low. In the end, it was not possible to downsize the molded transformer with the structure shown in FIG.

The purpose of the present invention is to provide a molded transformer in which the outer shape of the high-voltage molded winding is simplified, making it possible to use a casting mold with a simple structure, and making it possible to reduce the size of the winding. It's about doing.

The molded transformer of the present invention will be explained in detail below with reference to the illustrated embodiments.

In the molded transformer of the present invention, as shown in FIG. 4, a winding terminal 6 is drawn out from one end of the high voltage winding 8, and a plurality of taps are drawn out from the other end. has been established.

The tap switching tool 7 includes tap terminals 7a to 7f drawn out from a plurality of taps and an output lead-out terminal 7g, and any tap terminal among the tap terminals 7a to 7f and the output lead-out terminal 7 are provided.
By connecting g with tap selection contact 7h, the tap can be arbitrarily selected.

The high-voltage molded winding 4 is formed by molding the high-voltage winding 8 with synthetic resin into a cylindrical shape, and a part of the molded portion is cylindrical and protrudes from the outer surface of the high-voltage molded winding. As a result, a protrusion 9 for arranging a winding terminal and a protrusion 10 for arranging a tap changer are formed which are arranged substantially on the same axis of the winding.

The protruding portion 9 is provided with a winding terminal 6, and the protruding portion 10 is provided with tap terminals 7a to 7f and an output lead-out terminal 7g.

Any one of the tap terminals 7a to 7f and the output lead-out terminal 7g are connected by a tap selection contact 7h, and the end of the tap changer installation protrusion 10 is covered with a removable transparent cover (
Not shown.

) is closed by. The winding terminal 6 and the output lead-out terminal 7g of the tap changer are connected to connection rods 11 and 12, respectively.
The high-voltage molded windings 4, 4, . . . of each phase are connected in a predetermined connection method.

A high voltage terminal (not shown) is also connected to the winding terminal 6.
An external line is connected to this high voltage terminal.

The other structural parts are similar to the transformer shown in FIG. 1, and the same parts as in FIG. 1 are given the same reference numerals.

In the above description, a three-phase molded transformer was taken as an example, but it goes without saying that the present invention can be similarly applied to a single-phase molded transformer.

As described above, in the present invention, since the protruding part for arranging the winding terminal and the protruding part for arranging the tap changer are arranged side by side on substantially the same axis of the winding, the diameter of the high voltage winding can be reduced. Even if it is made small, each protrusion can be made to protrude in the same direction, and the structure of the resin casting mold can be simplified.

Furthermore, instead of arranging the three protrusions in parallel as in the conventional method, the two protrusions may be provided on the outer surface of the high-voltage molded winding in the vertical direction on substantially the same axis. Since it is possible to shorten the facing interval to a dimension sufficient to arrange the interphase connecting member, the axial length of the molded winding can be reduced, and the winding can be performed using a mold with a simple structure. This has the advantage that it is possible to easily manufacture a molded transformer with a small diameter, and the molded transformer can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a front view showing a conventional molded transformer, Fig. 2 is a circuit diagram showing the configuration of the high voltage winding of the conventional molded transformer,
Figure 3 is a plan view of the main parts showing the shape of the high-voltage molded winding when the winding diameter is reduced in a conventional molded transformer, and Figure 4 shows the structure of the high-voltage winding of the molded transformer of the present invention. The circuit diagram, FIGS. 5 and 6 are a front view and a right side view, respectively, showing an embodiment of the present invention. 1... Iron core, 3... Low voltage molded winding, 4... High voltage molded winding, 6... Winding disease terminal, 7...・Tap switching tool, 7a to 7f・
...Tap terminal, 7g...Output lead-out terminal, 7h...Tap selection contact, 9...
Projection for arranging winding terminal, 10...Protrusion for arranging tap changer.

Claims (1)

[Scope of utility model registration request] A high-voltage winding having a winding end terminal led out to one end of the winding wire and a plurality of taps led out to the other end is molded with synthetic resin, and the winding end terminal and tap terminals connected to the taps are arranged. A protruding part for arranging a winding end terminal and a protruding part for arranging a tap changer are provided on the outer surface of the synthetic resin molded part of the high-voltage molded winding, so that the two protrusions are substantially the same as each other of the high-voltage molded winding. A molded transformer characterized by being arranged in parallel on the axis of -.