JPS58119616A - Foil winding transformer - Google Patents

Abstract

PURPOSE:To enhance heat transmission between a cooling duct and a coolant at the foil winding transformer by a method wherein disk type spacers of the plural number are arranged zigzag in the coolant circulating course of the cooling duct provided in the coil of the transformer. CONSTITUTION:The disk type spacers 16 of the plural number are arranged zibzag in the cooling duct 6. When the disk type spacers thereof are to be assembled in the cooling duct, the spacers are fixed by spot welding, etc., to the cooling duct face on one side. The coolant 7 flows in the cooling duct 6 bypassing the disk type spacers, and because the sectional area of the circulating course varies extremely, the current of the coolant is disordered, and the heat transmission between the cooling duct and the coolant is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The fourth technical field of the invention is a foil-wrapped transformer having a built-in VC cooling duct in which a foil-wound conductor and an insulating sheet are wound in layers.

Conventional technology and its problems Foil-wrapped transformers ARS In order to apply it to a large-capacity transformer, it is necessary to increase the cooling capacity of the coil and provide the coil with high insulation capacity.For example, a cooling duct is built into the coil of an Emumaki transformer, and a refrigerant is supplied to this cooling duct. It is designed to directly cool the heat generated from the conductor.

This type of conventional foil-wound transformer has a foil-shaped conductor hole and an insulation sheath on the outside of the iron core (1) as shown in Figure 1.
- Layer them together to form a coil body and wind the low voltage coil (4) and high voltage coil (5). Each of these coils has a built-in annular cooling duct (6) as shown in FIG. A thin space is formed in this cooling duct through which a refrigerant (7) such as 0 CFCs kL113 or Fe12 can pass through. This refrigerant (7) Ni pump (8) K
The refrigerant F circulates, removes the heat generated in the foil-wound coil, raises the temperature, and is cooled by the cooling water a- of the cold refrigerant a cooler (9). This cooled refrigerant is further circulated through the refrigerant circulation circuit t, in which the cooled refrigerant is sent into the cooling duct by a pump. There are 4 cooling ducts, each of which is installed in the coil and connected to a fruit pipe a through which refrigerant can flow in or out of each cooling duct. Since this fruit tube Qll is made of metal such as stainless steel, an insulated pipe (2) is installed at the outlet of the cooling duct to maintain insulation from the cooling duct.
Along with ri (to), it is at ground potential. The potential of the cooling duct is electrically coupled to the same potential as the foil-wound conductor because it is wound inside the coil. Insulating oil sealed in the tank of the entire coil or 8
It is insulated with an insulating medium aa such as F or gas.

In Fig. 1, the lead wire from the conductor and the lead wire extending to the outside of the tank, such as a drawer bushing, are omitted. 1. This type of foil-wrapped transformer 4-frame cooling circulation circuit where the refrigerant flows and the insulation medium α and the thorns are completely separated (separated). We will call it a foil-wound transformer.

This separate foil-wound transformer is expected to have excellent cooling properties, so it is promising for use as a transformer for people.

However, in the conventional separate foil-wound transformer shown in FIG. 1, a cooling duct with an elaborate structure as shown in FIG. 3 (cross section A--A in FIG. 2) was used.

That is, in order to secure a flow path for the refrigerant to pass through the cooling duct by 1 kfI, rod-shaped spacers aB parallel to the flow direction of the refrigerant were arranged at appropriate intervals t-4.

This friend, as shown by the arrow in Figure 3, rectifies the flow of the refrigerant (7) with a rod-shaped spacer (LIIC) and creates a flow state with less turbulence, increasing the heat transfer coefficient between the cooling duct and the refrigerant. The purpose of the invention was made in consideration of the above circumstances for the purpose of the present invention,
The purpose is to create turbulence in the refrigerant flowing within the cooling duct and increase the heat transfer between the cooling duct and the refrigerant.

SUMMARY OF THE INVENTION The present invention achieves the above object by arranging a large number of disc-shaped spacers in a staggered manner in the refrigerant flow path of a cooling duct provided within the coil of a foil-wound transformer.

Effects of the Invention Due to the staggered arrangement of the disc-shaped spacers, the refrigerant flows seven times around the disc-shaped spacers, and the cross-sectional area of the flow path repeats rapid expansion and contraction, resulting in a one-flow flow. The heat transfer 4'4 between the cooling duct and the refrigerant is increased by providing a σ channel, resulting in a highly efficient transformer.

Practical NIA Example of the Invention An embodiment of the present invention is shown in Figure 4, in which a large number of disc-shaped spacers are arranged in a staggered manner in a cooling duct (6).

When this disc-shaped spacer is assembled into a cooling duct, it should be easily fixed to at least one side of the cooling duct surface using a method such as spot contact.

The same effect as the present invention can be obtained by using a spacer other than a disc type, such as a rhombus or an ellipse, but when assembling a spacer that is not symmetrical about the Vc axis, there are This is disadvantageous because it requires 1A% alignment.

According to the present invention, the refrigerant (7) σ is the point v shown by the arrow in FIG.
C? q! The refrigerant flows inside the cooling duct (6) while circulating around the disk-shaped subway 11-t, and the cross-sectional area of the flow path changes drastically, so that if the refrigerant is distorted, it is disturbed and the heat transfer coefficient between the cooling duct and the refrigerant is increased.

[Brief explanation of drawings]

Fig. 1 shows a conventional foil-wound transformer, Fig. 2 shows a conventional cooling duct, Fig. 3 shows A-Fig. 9 of Fig. 2, and Fig. 4 shows σ It is a figure showing an example of a cooling duct. 2... Foil conductor, 3... Insulating sheet, 6...
- Cooling duct, 7... Refrigerant, 16... Disc-shaped spacer. Agent Patent Attorney Noriyuki Chikamaro (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Foil-wound conductor and insulation sheet) t-1 VC in the twisted coil
A foil-wound transformer having a built-in cooling duct, characterized in that a large number of disc-shaped spacers are arranged in a staggered manner in a refrigerant flow path of the cooling duct.