JPH08264346A - Winding fastening structure of transformer - Google Patents

Abstract

PURPOSE: To provide a transformer winding fastening structure which is easily processed and compact in structure, wherein a tank is small in width, an insulation distance is easily kept enough between a lead wire of a coil outlet and a lower winding fastener, and the lead wire is smoothly led out. CONSTITUTION: An insulating plate 4 and an iron core fastening plate 5 are arranged on a lower yoke 2 of an iron core 3, a binding material 6 which fastens the periphery of the lower yoke 2 tightly, a winding 11 composed of a coil pad 7, a coil 8, an insulating ring 9, and a clamp ring 10 is fitted in an iron core leg 1, and an upper yoke 12 is formed on the iron core leg 1. An insulating plate 13 and an iron core fastening plate 14 are arranged on the upper yoke 12, the outer periphery of the upper yoke 12 is tightly bound, and a winding 11 is tightly bound with a lower winding fastener 15 which is L-shaped in cross section and provided in the lower yoke 2, an upper winding fastener 16 which is of inverted L shape in cross section and provided in the upper yoke 12, and a connecting bolt 17 through the intermediary of an upper coil presser 18 over the clamp ring 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer winding tightening structure, wherein the winding tightening structure and the iron core tightening structure are separate and independent structures. It is about.

[0002]

2. Description of the Related Art Conventionally, an upper core yoke and a lower yoke of an iron core are fastened in the laminating direction by a binding material through an insulating plate and an iron core tightening plate arranged on both sides in the laminating direction, and the upper and lower outer yokes are fastened to each other. The connecting bolts that are connected to the winding clamps are used to tighten the windings through the coil retainer and coil base. At that time, a bending force is applied to the upper winding fastening fitting and the lower winding fastening fitting, so a member having a U-shaped cross section is used to increase the section modulus.

FIG. 4 is a side view showing an example of a winding tightening structure of a conventional transformer. As shown in FIG. 4, a lower yoke 2 having magnetic steel sheets laminated thereon, and the lower yoke 2 facing downward, E-shaped with three iron core legs 1 established on it (in case of three phases)
Of the lower yoke 2 is formed, and the iron core tightening plates 5 are arranged on both sides of the lower yoke 2 in the stacking direction with the insulating plates 4 interposed therebetween. The outer circumference of the lower yoke 2 is tightened with the binding material 6, and the iron core leg 1 is
The coil base 7, the coil 8, the insulating ring 9 and the clamp ring 10 are fitted in this order from the lower side, and the winding 11 is fitted therein, and the iron core leg 1 and the magnetic steel plates of the upper yoke 12 are alternately laminated on the upper part of the iron core leg 1. The upper yoke 12 is formed by stacking the upper yokes 12 in the same direction, and the iron core fastening plates 14 are disposed on both sides of the upper yoke 12 in the stacking direction with the insulating plates 13 interposed therebetween.
Tighten the outer periphery of 2 with the binding material 6.

On both sides of the lower yoke 2 of the iron core 3, lower winding fastening fittings 31 having a U-shaped cross section are arranged. Similarly, on both sides of the upper yoke 12, an upper winding fastening member having a U-shaped cross section is arranged. The fitting 32 is arranged, and the connecting bolt 17 is passed through the space between the iron core 3 and the inner circumference of the winding 11 to connect the upper and lower winding tightening fittings 3
1 and 32 between the horizontal parts on the same side, this connecting bolt 1
7 is bridged, and by tightening the connecting bolt 17, the winding 11 is vertically tightened on both sides via the coil retainer 33 arranged on the upper side of the clamp ring 10. It should be noted that the winding 1
One lead wire 20 is pulled out. An insulating plate 23 is provided between the upper winding fastening member 32 and the upper yoke 12 and between the lower winding fastening member 31 and the lower yoke 2 except where the connecting bolt 17 passes. ing.

Both ends of the lower winding fastening fitting 31 on both sides of the lower yoke 2 of the iron core 3 are connected to each other by box-shaped or channel-shaped connecting fittings (not shown) by bolting or the like. Similarly, both ends of the upper winding fastening member 32 having a U-shaped cross section are connected to both sides of the upper yoke 12 by box-shaped or channel-shaped connecting members (not shown) by bolting or the like.

[0006]

In the tightening structure of the transformer winding described in the prior art, the dimension B'in the width direction of the upper winding tightening fitting and the lower winding tightening fitting is large. If the insulation distance Z _{1 from} that point to the lead wire 20 is taken, half the dimension M (A '+ B' + Z ₁ + D + Z ₂ ) in the width direction of the tank.
However, there is a problem in that it is difficult to secure an insulation distance between the lead wire 20 at the coil outlet and the lower winding tightening fitting 31. A'is the distance from the center to the winding clamp, D is the diameter of the lead wire, and Z ₂ is the distance between the lead wire and the tank.

The present invention has been made in view of the above problems of the prior art. The tank has a small dimension in the width direction, and the lead wire at the coil outlet is insulated from the lower winding tightening metal fitting. It is an object of the present invention to provide a compact transformer winding tightening structure in which a distance can be easily secured, lead wires can be smoothly drawn out, and processing is easy and compact.

[0008]

In order to achieve the above object, a winding tightening structure of a transformer according to the present invention has a laminating direction of a lower yoke of an iron core comprising an iron core leg and a lower yoke laminated with magnetic steel sheets. Place the iron core clamping plates on both sides of the lower core by tightening the binding material on the outer periphery of the lower yoke, and place the coil base, the coil, the insulating ring, and the clamp ring in this order on the iron core leg from below. Insert the magnetic steel plate into the upper part of the iron core leg to form the upper yoke, place the iron core tightening plates with insulating plates on both sides of the upper yoke in the stacking direction, and tighten the outer circumference of the upper yoke with the binding material. In the transformer, the lower winding tightening metal fittings are L-shaped whose cross-sectional shape is horizontally bent at the bottom of the steel plate on both sides of the lower yoke of the iron core and Top of An upper L-shaped upper winding tightening metal fitting which is bent horizontally is arranged on the iron core side, and the upper and lower winding tightening metal fittings are wound by connecting bolts via a coil retainer arranged on the upper side of the clamp ring. Is a winding tightening structure for a transformer in which the coil is tightened in the vertical direction.

[0009]

With the above-described structure, the dimension of the winding tightening metal fitting in the thickness direction is reduced, the width dimension of the tank is reduced, and the transformer can be made compact and the coil can be made compact. It is easy to secure the insulation distance between the lead wire at the lead-out portion and the lower winding tightening metal fitting, and there is no need for processing such as notching the lower winding tightening metal fitting so that the lead wire can be pulled out smoothly.

[0010]

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

FIG. 1 is a side view of an essential part showing an embodiment of a transformer winding tightening structure of the present invention, FIG. 2 is a front view of a transformer main body, and FIG. 3 is a plan view of the essential part. As shown in FIG. 1, FIG. 2 and FIG. 3, an E-shaped (three-phase type) is formed by a lower yoke 2 in which magnetic steel plates are laminated and three iron core legs 1 which are set on the lower yoke 2 as a lower side. The core 3 is formed, and iron core tightening plates 5 are arranged on both sides of the lower yoke 2 in the stacking direction with insulating plates 4 interposed therebetween to bind the outer circumference of the lower yoke 2 with the binding material 6.
The coil base 7, the coil 8, the insulating ring 9 and the clamp ring 10 in this order from the lower side, and the winding wire 11 is fitted into the iron core leg 1, and the iron core leg 1 and the upper yoke are attached to the upper part of the iron core leg 1. 12 magnetic steel plates are alternately stacked in the stacking direction to form the upper yoke 12, and the insulating plate 1 is formed on both sides of the upper yoke 12 in the stacking direction as shown in FIG.
The iron core tightening plate 14 is arranged via 3 and the outer circumference of the upper yoke 12 is tightened with the binding material 6.

On both sides of the lower yoke 2 of the iron core 3, there are arranged L-shaped lower winding fastening metal fittings 15 formed by horizontally bending the lower portion of a steel plate having a vertical cross section toward the iron core side. Box-shaped or channel-shaped connecting fittings (not shown) are connected to each other at both ends of the fastening fittings 15 by bolting or the like. Similarly, inverted L-shaped upper winding fastening metal fittings 16 formed by horizontally bending the upper portion of a steel plate having a vertical cross section on the iron core 3 side are arranged on both sides of the upper yoke 12, and are connected to each other by bolting or the like. Then, the connecting bolt 17 is passed through the gap between the iron core 3 and the inner circumference of the winding 11, and the connecting bolt 17 is bridged between the horizontal parts on the same side of the upper and lower winding fastening fittings 16 and 15. The coil retainer 18 placed above the clamp ring 10 by tightening the connecting bolt 17
The winding 11 is tightened in the up-down direction on both sides via. A winding support portion 19 is welded to a portion of the lower winding fastening member 15 that supports the winding 11 at a position separated from a lead portion of the lead wire 20 by a required insulation distance. An insulating plate 23 is provided between the upper winding fastening member 16 and the upper yoke 12 and between the lower winding fastening member 15 and the lower yoke 2 except where the connecting bolt 17 passes. ing.

The transformer body formed by the iron core 3 and the winding wire 11 is fixed on the iron core base 22 of the tank 21 and is housed inside the tank 21 together with the insulating cooling medium.

In the transformer winding tightening structure of the present invention, the dimension B in the thickness direction of the upper winding tightening metal fitting 16 and the lower winding tightening metal fitting 15 becomes smaller, and the insulation distance from the lead wire 20 becomes smaller. Z ₁
Is smaller, the half size M of the tank 21 in the width direction is
Is smaller, the overall size of the transformer can be made compact, and the insulation distance between the lead wire 20 of the coil outlet G and the lower winding tightening fitting 15 can be easily secured. Since there is no processing such as notching 15 and the like, the lead wire 20 can be pulled out smoothly.

[0015]

Since the present invention is configured as described above, the following effects can be obtained.

(1) Since the dimension of the winding tightening fitting in the thickness direction is reduced, the dimension of the tank in the width direction is reduced, and the transformer can be made compact.

(2) It is easy to secure an insulation distance between the lead wire at the coil outlet and the lower winding tightening metal fitting, and there is no need to perform processing such as notching the lower winding tightening metal fitting, and the lead wire is smooth. Can be pulled out.

[Brief description of drawings]

FIG. 1 is a side view of essential parts showing an embodiment of a winding tightening structure for a transformer of the present invention.

FIG. 2 is a front view showing an embodiment of the winding tightening structure of the transformer body of the present invention.

FIG. 3 is a main part plan view showing an embodiment of the transformer winding tightening structure of the present invention.

FIG. 4 is a side view showing an example of a winding tightening structure of a conventional transformer.

[Explanation of symbols]

1 ... Iron core leg 2 ... Lower yoke 3 ... Iron core 4, 13 ... Insulation plate 5, 14 ... Iron core tightening plate 6 ... Binding material 7 ... Coil base 8 ... Coil 9 ... Insulation ring 10 ... Clamp ring 11 ... Winding 12 ... Upper yoke 15 ... Lower winding tightening metal fitting 16 ... Upper winding tightening metal fitting 17 ... Connecting bolt 18 ... Coil retainer 19 ... Winding supporting part 20 ... Lead wire 21 ... Tank 22 ... Iron core 23 ... Insulating plate A ... Iron core center and the dimension B ... winding of the clamping bracket in the thickness direction of the dimension D ... in the width direction of the diameter M ... tank leads half dimension Z ₁ ... with upper winding fasteners winding up fitting inner fastening Insulation distance from lead wire

Claims (1)

[Claims] 1. An iron core consisting of an iron core leg laminated with magnetic steel plates and a lower yoke, an insulating plate and an iron core clamping plate are arranged on both sides of the lower yoke in the laminating direction, and the outer periphery of the lower yoke is clamped with a binding material to form the iron core. Insert the coil base, the coil, the insulating ring and the clamp ring in this order from the bottom to the leg, insert the magnetic steel plate into the upper part of the iron core leg to form the upper yoke, and insulate both sides of this upper yoke in the stacking direction. In a transformer in which a plate and an iron core tightening plate are arranged and the outer periphery of the upper yoke is tightened with a binding material, a lower winding tightening metal fitting having an L-shaped cross section arranged on both sides of the lower yoke of the iron core, It is characterized in that the windings are fastened by connecting bolts to upper winding tightening metal fittings having an inverted L-shaped cross section arranged on both sides of the upper yoke via coil retainers arranged above the clamp ring. The transformer winding tightening structure.