JPH0533513U - Lead extraction device for transformer - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The purpose is to simplify the structure of the lead-out portion of the lead wire of the coil on the high-voltage side of the transformer. [Structure] The lead-out portion 4 is configured by a metal shield tube 12, and the lead wire 3 is inserted into the shield tube 12 and pulled out to the outside. Since the shield tube 12 is used, the winding of the insulating paper is not necessary to maintain the curvature necessary for the electric field relaxation, and the shield tube 1 having a diameter corresponding to the insulation class is used.
2 can be used selectively. By eliminating the surface irregularities, uniform electric field characteristics can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lead-out device for a lead of a transformer, particularly a lead of a high-voltage coil.

[0002]

[Prior Art]

 As is well known, the coil of the transformer is constructed as shown in FIG. In the figure, 1 is a high-pressure side coil, 2 is a low-voltage side coil, both of which are coaxially wound around an iron core (not shown in the figure). The lead wire 3 drawn from the high voltage side coil 1 is drawn to the outside from the drawing portion 4. Reference numeral 5 is a lead wire drawn from the low voltage side coil 2, and 6 is an insulating ring.

FIG. 2 is an enlarged view of the lead-out portion 4 of the conventional configuration. The lead wire 3 of the high-voltage coil 1 is pulled out together with the lead wire from the shield ring 7, and is insulated on the outer periphery thereof. The paper 8 is wound up to a diameter having a required electric field gradient. The conductive tape 9 is wound around the surface, and the insulating tape 10 is further wound around the surface to form the pull-out portion 4. Reference numeral 11 is an insulating tube.

However, according to the lead-out portion 4 having such a configuration, the work of winding the insulating paper 8 around the lead wire 3 is required, and therefore the work takes a long time. Further, due to variations in the work of winding the insulating paper 8, irregularities may be formed in the curved portion of the tape 9, which may cause electric field concentration and deteriorate electric field characteristics.

[0005]

[Problems to be solved by the device]

 An object of the present invention is to improve the efficiency of the assembly work and the electric field characteristics by simplifying the structure of the lead-out portion of the high voltage side coil.

[0006]

[Means for Solving the Problems]

 In the present invention, the lead-out portion is constructed by winding an insulating tape around the outer circumference of a metal shield tube, and the lead wire from the high voltage side coil is inserted into the inside of the shield tube to be drawn out to the outside. It is characterized by

[0007]

[Action]

 The lead wire is shielded by the shield tube. Then, it is not necessary to wrap the insulating paper to secure the necessary curvature in the drawn-out portion. Since the shield tube is made of metal, there are almost no irregularities on its outer circumference. Therefore, uniform electric field characteristics can be obtained. Moreover, it is possible to secure an arbitrary degree of curvature according to the insulation class.

[0008]

【Example】

 An embodiment of this invention will be described with reference to FIG. In addition, the parts given the same reference numerals as those in FIG. 2 indicate the same or corresponding parts. According to the present invention, a shield tube 12 made of metal such as aluminum is prepared. Of course, the form is cylindrical. Then, by winding the insulating tape 13 around the outer circumference thereof, the pull-out portion 4 is formed.

The lead wire 3 drawn out from the high voltage side coil 1 is inserted into the shield tube 12 and drawn out from there. The lead-out portion 4 is installed so as to penetrate the peripheral wall of the insulating cylinder 11.

According to this structure, the lead wire 3 is shielded because it is inside the shield tube 12. Since the shield tube 12 is used to secure the curvature in the drawing portion 4, it is not necessary to wrap the insulating paper as in the conventional case, and the working time can be shortened easily.

Further, since the insulating paper is not required to be wound, the unevenness of the curvature due to the variation of the winding is eliminated, and the stable electric field characteristic can be obtained. Moreover, it is possible to select and use a shield tube having an arbitrary diameter according to the insulation class, and thus it is possible to easily construct a shield tube having a curvature corresponding to the required insulation class.

[0012]

[Effect of the device]

 As described above in detail, according to the present invention, the extraction portion of the coil on the high voltage side is configured by the metal shield tube, so that the configuration of the extraction portion is simplified and the efficiency of the assembling work is improved. And the effect of improving the electric field characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional example.

FIG. 3 is a schematic perspective view of a transformer.

[Explanation of symbols]

 1 High-voltage side coil 2 Low-voltage side coil 3 High-voltage side coil lead wire 4 Drawer 12 Shield tube 13 Insulating tape

Claims (1)

[Scope of utility model registration request] 1. A transformer lead drawing device for drawing a lead wire from a coil on a high voltage side of a transformer, wherein a lead portion is formed by winding an insulating tape around an outer circumference of a metal shield tube, A lead lead-out device for a transformer, in which a lead wire from the high-voltage side coil is inserted inside to lead out to the outside.