JP2591825Y2 - Lead wire extraction device for transformer winding - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a lead wire drawing device for a transformer winding which is wound around an outer periphery of an iron core leg into an upper coil and a lower coil.

[0002]

2. Description of the Related Art In general, there is a case where a transformer winding is divided into upper and lower portions around an outer periphery of an iron core leg and used in series or in parallel. When the lead wire is drawn out from the upper side of the split winding as a lead wire drawing structure of the transformer winding (hereinafter, referred to as a split winding) wound around the split winding, the winding start of the lower coil is placed inside the upper coil. There is a structure in which the lead wire is drawn out to the upper side of the upper coil through the cooling duct, and the lead wire at the winding end of the lower coil is drawn out to the upper side of the upper coil through the cooling duct outside the upper coil. When the lead wire is pulled out from the lower side of the winding, the lead wire of the upper coil is drawn out above the upper coil, and the lead wire of the lower coil is drawn out below the lower coil and passed through the outside of the outer winding. There is a structure that stands up on the upper side.

FIG. 3 is a side sectional view showing an example of a conventional lead wire lead-out structure when a lead wire is pulled out from the upper side of a winding. In FIG.
The upper coil 3 is wound around the upper part of the outside and the lower coil 4 is wound below the lower part. The winding start lead wire 6 of the lower coil 4 is pulled out above the upper coil through the cooling duct inside the upper coil 3, and the winding end lead wire 8 of the lower coil 4 is drawn.
Through the cooling duct outside the upper coil 3 and above the upper coil of the upper coil. An outer winding 13 is wound around the outer periphery of the upper coil 3 and the lower coil 4 via an insulating tube 12.

FIG. 4 is a side sectional view of an essential part showing another example of a lead wire drawing structure of a split winding of a conventional transformer when a lead wire is drawn from the lower side of the winding. The lead wires 5 and 7 of the upper coil 3 are drawn out above the upper coil, and the lead wires 6 and 8 of the lower coil 4 are drawn out below the lower coil.
And rises to the upper side of the winding through the outside.

[0005]

However, among the conventional structures, in the case of the structure in which the lead wire is drawn out from the upper side of the divided winding as shown in FIG. 3, the winding end lead wire 8 of the lower coil 4 is divided. In order to become the maximum size of the winding, it is necessary to eccentric the outer winding 13 and to secure a necessary insulation dimension, and the types of dimensions of the inter-winding support between the split winding and the outer winding become diverse, This has led to an increase in design and processing time. In addition, since the dimension between the divided winding and the outer winding 13 is determined in consideration of the increase in the lead wire portion, the dimension between the divided winding and the outer winding 13 is increased, and the electric wire / iron core is increased. As the weight of the transformer increased, the external dimensions of the transformer also increased.

Further, of the conventional structure, in the case of a structure in which the lead wire is drawn out from the lower side of the split winding as shown in FIG. 4, the winding start lead wire 6 and the winding end lead wire 8 of the lower coil 4 are wound outside. Since the outside of the wire 13 is raised and connected, a support member such as a cleat and a support insulator for supporting the lead wire of the lower coil 4 is required, and the processing of the lead wire is complicated, and the outside winding is performed. In order to secure the required insulation distance between the wire 13 and the lead wires of the upper coil 3 and the lower coil 4, the size of the core yoke between the core legs 1 and 1 becomes large, and the core weight increases. The outer dimensions of the transformer were also large due to the lower coil start-up lead.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and aims to provide a transformer which simplifies a lead wire support structure and increases the efficiency of connection work, and has a small iron core weight and small external dimensions. With the goal.

[0008]

SUMMARY OF THE INVENTION In the lead winding device for a transformer winding according to the present invention, the winding start lead of the lower coil is pulled out to the upper side of the upper coil along the inside of the winding lead of the upper coil. The winding end lead of the lower coil is drawn out to the upper side of the upper coil along the inside of the winding end lead of the upper coil.

[0009]

As described above, in the transformer winding lead wire drawing device of the present invention, the winding start lead wire of the lower coil is drawn out above the upper coil along the inside of the winding lead wire of the upper coil. Since the winding end lead wire of the coil is drawn out to the upper side of the upper coil along the inside of the winding end lead wire of the upper coil, there is no increase in the size for drawing out the lead wire of the lower coil. By reducing the dimension between the winding and the outer winding and the size of the iron core yoke, the entire transformer can be reduced in size, and the lead wire support structure can be simplified and the connection work can be made more efficient.

In addition, a spacer is arranged between the upper and lower coils,
Since the cooling duct is divided, an increase in the air temperature in the coil is suppressed, and as a result, the cooling efficiency can be improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a first embodiment of a transformer winding lead wire drawing device according to the present invention, and FIG. 2 is a first embodiment of a transformer winding lead wire drawing device according to the present invention. FIGS. 1 and 2 are top plan views of a winding showing an embodiment. In FIGS. 1 and 2, an upper coil 3 is wound around an outer periphery of an insulating cylinder 2 around an iron core leg 1, and a lower coil 4 is wound below. ing. The winding start lead wire 6 of the lower coil 4 is pulled out above the upper coil along the inside of the winding start lead wire 5 of the upper coil 3, and the winding end lead wire 8 of the lower coil 4 is wound on the upper coil 3. Is pulled out along the inside of the upper coil. Then, the lead wire of the lower coil 4 is passed through a part of the inner duct of the upper coil 3 so as to absorb an increase in size due to the rise of the lead wire of the lower coil 4.

As shown in FIG. 2, a gap correcting insulator 9 is provided on each of the triangular gaps on both sides in the circumferential direction of the winding start lead wire 6 of the lower coil 4 and the winding end lead wire 8 of the lower coil 4. Arrange. Also, as shown in FIG. 1, spacers 10 are arranged between the upper coil 3 and the lower coil 4 so as to make up for the reduction of the cooling area and to reduce the cooling of the refrigerant in the coil duct. Suppress temperature rise. Duct pieces 11 for cooling ducts are arranged at required positions on the coil circumference between the layers of the coils. An outer winding 13 is wound around the outer periphery of the upper coil 3 and the lower coil 4 via an insulating tube 12.

FIG. 5 is a temperature distribution diagram showing the temperature distribution inside the winding when the spacer 10 between the upper and lower coils is not provided between the upper coil 3 and the lower coil 4 of the transformer winding, and FIG. 6 is a transformer. FIG. 4 is a temperature distribution diagram showing a temperature distribution state inside the winding when a spacer 10 between the upper and lower coils is arranged between the upper coil 3 and the lower coil 4 of the winding, and the vertical axis indicates the position of the height of the coil. The horizontal axis indicates the temperature of the refrigerant in the cooling duct. 5 and 6, when it is considered that the tendency of the refrigerant temperature in the cooling duct of the upper coil 3 and the lower coil 4 is the same, the upper coil 3 and the lower coil 4 of the transformer winding shown in FIG. the upper and lower coil between the spacer 10 relative to the refrigerant temperature difference △ theta ₁ between the average temperature theta ₁ in the cooling duct when not disposed, between the upper coil 3 and the lower coil 4 of the transformer windings shown in FIG. 6 in the average temperature difference of the coolant in the cooling duct in the case of arranging the upper and lower coil between the spacer 10 △ theta ₂ between the average temperature theta _2, the temperature rise by radial cooling duct is suppressed, and the temperature rise of the refrigerant correspondingly Temperature is reduced, △ Θ ₂
<△ Θ ₁ next, and Θ ₂ <Θ _1.

[0015]

[Effect of the Invention] The lead winding device of the transformer winding of the present invention is configured as described above. (1) Since there is no increase in the dimension for drawing the lead wire of the lower coil, it is divided. By reducing the dimension between the winding and the outer winding and of the core yoke, the overall transformer can be reduced in size.

(2) Since all the lead wires of the upper coil and the lower coil of the inner coil are drawn out above the transformer winding, the lead wire support structure can be simplified and the connection work can be made more efficient. (3) By arranging a spacer between the upper and lower coils between the upper coil and the lower coil and providing a cooling duct in the radial direction, a rise in the refrigerant temperature in the coil is suppressed, and as a result, the cooling efficiency is improved. Thus, the overall size of the transformer is reduced.

Such excellent effects as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part of an embodiment of the present invention.

FIG. 2 is a plan view of one embodiment of the present invention.

FIG. 3 is a vertical sectional side view of a main part of a conventional lead winding structure of a transformer winding.

FIG. 4 is a vertical sectional side view of a main part of another example of a conventional lead-out structure of a transformer winding.

FIG. 5 is a temperature distribution diagram showing a temperature distribution inside the winding when no spacer is provided between the upper coil and the lower coil of the transformer winding.

FIG. 6 is a temperature distribution diagram showing a temperature distribution inside a winding when a spacer is provided between an upper coil and a lower coil of a transformer winding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Iron leg 2 ... Insulating cylinder 3 ... Upper coil 4 ... Lower coil 5 ... Lead wire at the beginning of winding of the upper coil 6 ... Lead wire at the beginning of winding of the lower coil 7 ... Lead wire at the end of winding of the upper coil 8 ... Lower coil 9 ... Insulator for gap correction 10 ... Spacer between upper and lower coils 11 ... Duct piece for cooling duct 12 ... Insulation cylinder 13 ... Outer winding

Claims (2)

(57) [Scope of request for utility model registration] In a transformer winding wound around an outer periphery of an iron core leg into an upper coil and a lower coil, a lead wire of the lower coil is wound along a lead wire of the upper coil. A winding end lead wire of the lower coil is drawn out above the upper coil along the inside of the winding end lead wire of the upper coil. Lead wire drawing device. 2. The lead-out device for a transformer winding according to claim 1, wherein a cooling duct is divided by disposing a spacer between the upper coil and the lower coil.