JP2591836Y2 - Transformer with built-in stable winding - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer with a built-in stable winding.

[0002]

2. Description of the Related Art FIG. 4 is a front view showing an example of a conventional stable winding lead connection. In FIG. 4, the stable winding is connected in a △ connection by a stable winding lead 10, and then grounded by a connection terminal 11 to an earth portion such as the iron core clamping plate 7. FIG. 2 and FIG. 3 are cross-sectional views showing an example of electric field relaxation of a conventional transformer with a built-in stable winding. 2 and 3,
Bushing lead 6 for connecting winding 2 and bushing 5
Requires an insulation distance for keeping the electric field strength within the allowable electric field strength with respect to the ground portion such as the stable winding lead 10 and the iron core clamping plate 7. In particular, since a large insulation distance is required for the protruding portion of the iron core tightening plate 7, in order to reduce the size of the device, it is necessary to subdivide the oil gap into which the insulating barrier is inserted, or to attach an electric field shield wire. Measures have been taken. FIG. 2 shows an example in which an insulating barrier is inserted and the oil gap is subdivided.
Electric field relaxation is performed. FIG. 3 shows an example in which an electric field shield wire is attached to the iron core tightening plate 7.
Electric field relaxation is performed.

[0003]

However, in this conventional electric transformer with a built-in stable winding, the insulating barrier 8 is not used.
In addition, extra components such as the electric field shield wire 9 for reducing the electric field are required, resulting in a complicated structure. Therefore,
The present invention omits extra parts for the purpose of electric field mitigation, and uses a stable winding lead 10 for connecting a stable winding to a 線 connection.
The electric field between the ground projection and the bushing lead 6 is reduced,
This is to reduce the insulation distance.

[0004]

According to the present invention, the stable winding lead 10 of the transformer with a built-in stable winding is wired along with the ground projection.

[0005]

In the lead wiring configured as described above, the stable winding lead 10 also serves as an electric field shield line, and reduces the electric field between the ground projection and the bushing lead 6.

[0006]

1 shows an example of a stable winding lead connection according to the present invention, wherein FIG. 1 (a) is a front view and FIG. 1 (b) is a sectional view. FIG.
After the stable winding is connected to the に connection by a stable winding lead 10, the stable winding is grounded by a connection terminal 11 to an earth portion such as the iron core clamping plate 7. The bushing lead 6 connecting the winding 2 and the bushing 5 needs an insulation distance to keep the insulation strength within the allowable electric field strength with respect to the grounding portion such as the iron core fastening plate 7, and particularly the iron core fastening. A large insulation distance is required for the projection of the plate 7. The stable winding lead 1 is attached to the protrusion of the iron core fastening plate 7.
By wiring 0, the stable winding lead 10 functions as an electric field shield, and the electric field is alleviated, so that the insulation distance can be reduced.

[0007]

According to the present invention, as described above, by using the stable winding lead also as the electric field shield wire, an extra part for alleviating the electric field is omitted, and the lead wiring is simplified. In addition, the insulation distance between the grounding protrusion and the bushing lead is reduced, and the transformer can be made more compact.

[Brief description of the drawings]

FIG. 1 shows an example of a stable winding lead connection of the present invention;
(A) is a front view and (b) is a cross-sectional view.

FIG. 2 is a cross-sectional view showing an example of electric field relaxation of a conventional transformer with a built-in stable winding.

FIG. 3 is a cross-sectional view showing an example of electric field relaxation of a conventional transformer with a built-in stable winding.

FIG. 4 is a front view showing an example of a conventional stable winding lead connection.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 iron core 2 winding 3 tank 4 cover 5 bushing 6 bushing lead 7 iron core tightening plate 8 insulating barrier 9 electric field shield wire 10 stable winding lead 11 connection terminal

Claims (1)

(57) [Scope of request for utility model registration] 1. A transformer with a built-in stable winding, wherein a stable winding lead for connecting the stable winding to a △ connection is wired along with a ground projection inside the transformer.