JP2924533B2 - Stationary guidance equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary induction device in which a number of windings are wound around an iron core.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing a conventional stationary induction machine in which three windings are wound around an iron core. In FIG. 3 is a high voltage winding, 4 is a tap winding, 5 is a cylindrical insulating cylinder, 6 is a cooling flow, 7 is a cooling flow passing through each of the windings 2 to 4 in a zigzag shape in each winding. Stopper for flowing, 8
Is an insulator that supports and fixes the tap winding 4 up and down, and 9 is a tank that houses stationary induction equipment. Each winding 2, 3,
4 is horizontally separated into a plurality of stages so that the cooling flow can pass horizontally.
You can do it.

Next, the operation will be described. Stopper 7
FIG. 6 shows the flow of the cooling flow 6 evenly in each of the windings 2 to 4.
As shown in the figure, each of the windings 2 to 4 is provided above, inside, and below the windings 2 to 4 and divided into two vertically. In this way, a cooling flow is supplied from the lower outside of each of the windings 2 to 4, and a cooling flow is applied to the lower winding from the outside to the inside to cool the windings evenly. Conversely, a cooling flow is applied to the upper winding from the inside to the outside to cool the winding evenly. As described above, the cooling flow divided for each of the windings 2 to 4 by the insulating cylinder 5 is applied to each of the windings 2 to 4.
Is transferred to a cooler (not shown) provided outside to cool each winding of the stationary induction device.

[0004]

The conventional stationary induction device is constructed as described above, but the tap winding 4 wound on the outermost layer is generally compared with the other windings 2 and 3. The winding capacity is small, so that the heat loss generated in the winding is also small.
However, since the coil is wound on the outermost layer, the cross-sectional area of the cooling inlet formed by the winding 4 and the insulating cylinder 5 tends to be larger than those of the other windings 2 and 3 having large heat loss. For this reason, the cooling flow 10 having a large flow rate can be obtained for the generated heat loss, so that it becomes difficult for the cooling flow to flow to the other windings 2 and 3 which require a large amount of cooling flow. However, there is a problem that the temperature rise value exceeds the specified value and the insulation life of the winding is quickly deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the cooling flow flowing through the outermost layer tap winding is reduced to an amount corresponding to the loss, so that another winding having a large loss can be formed. suppressed within a temperature rise value of the defined by the flow a large amount of cooling flow to the line, and to obtain a stationary induction apparatus which can improve the insulation deterioration of windings with temperature.

[0006]

A stationary induction machine according to the present invention has a flange for restricting a cooling flow flowing through a tap winding on an insulator supporting and fixing the tap winding wound on the outermost layer. It is provided.

[0007]

[Action] In the present invention, is provided with the collar on the tap winding support fixing insulator, reducing the input area out cooling flow stream is formed between the cylindrical insulating cylinder surrounding the outer periphery of the tap winding As a result, the cooling flow passing through the tap winding can be reduced.

[0008]

[Embodiment 1] Hereinafter, an embodiment of the present invention FIG. 1, the Figure 2. 1 is a cross-sectional view, and FIG. 2 is a perspective view of a main part of FIG. 1. The same or corresponding parts as those of the conventional one are denoted by the same reference numerals and description thereof is omitted. A cooling flow 6 for cooling the stationary induction device from outside is provided with windings 2 to 4 at the lower part of the stationary induction device.
Formed between will be diverted respectively, one place the tap winding 4 by arranging the insulator 8a in the lower support fixed insulator 8 of the tap winding 4 having an insulating cylinder 5 disposed on the outer periphery because are reducing the Nyudan area out cooling flow stream that is, to flow to focus in an amount corresponding to the thermal loss occurring cooling flow 10 flowing through the tap winding 4 flow path resistance is increased by the tap winding 4 Becomes possible. Therefore, the other windings 2,
3 can flow a large amount of cooling flow, and since the temperature rise of these windings 2 and 3 is kept within a specified value, heat
It is possible to improve the degradation of that winding insulation. Therefore, the operation can be performed without impairing the life of the stationary induction device.

Embodiment 2 FIG. In Embodiment 1, one has to place the insulator 8a having disposed below the support fixed insulator in 8 of the tap winding 4, for example, the top of the tap winding 4 supporting fixed insulator within 8 (in FIG. 3 The same effect can be obtained by arranging it in the tap winding 4 (the position indicated by reference numeral B or C in FIG. 3) or in the tap winding 4 (the position indicated by reference numeral B or C in FIG. 3).

Embodiment 3 FIG. In Embodiment 1 showed that reducing the flow path cross-sectional area which flows to the tap winding 4 by the flange 8a provided on the insulator, Fig. 4, tap the gear-shaped insulator 8A as shown in FIG. 5 The cooling flow rate flowing through the winding 4 can be reduced to an amount commensurate with the heat loss, and the same effect as that of the first embodiment can be obtained.

[0011]

As described above, according to the present invention, it is possible to supply a large amount of cooling flow to the windings other than the tap winding having a large heat loss, so that the temperature rise of each winding is within a specified value. And the deterioration of the winding insulator due to temperature can be improved. Therefore, there is an effect that the operation can be performed without impairing the life of the stationary induction device.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stationary guidance device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of FIG.

FIG. 3 is a sectional view of a main part of a stationary guidance device according to a second embodiment of the present invention.

FIG. 4 is a plan view of an insulator showing a third embodiment of the present invention.

FIG. 5 is a view showing an arrangement state of insulators in FIG. 4;

FIG. 6 is a sectional view showing a conventional stationary guidance device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Iron core 2 Low voltage winding 3 High voltage winding 4 Tap winding 5 Insulating cylinder 6 Cooling flow 7 Stopper 8 Tap winding supporting fixed insulator 9 Tank 8a Fixed insulating material having a collar 10 Cooling flow of tap winding

Claims (2)

(57) [Claims] In a stationary induction machine having a plurality of windings around an iron core, a collar is provided on an insulator for vertically fixing an outermost winding, and a cylindrical member is formed on the outermost winding and an outer periphery thereof. and characterized in that so as to narrow down the cooling rate Ru passing <br/> a by reducing the flow entering and leaving the area of the cooling duct formed in the winding of the outermost layer between the wound on the insulating cylinder Stationary induction equipment. 2. The stationary induction machine according to claim 1, wherein a cutout is formed in the brim of the insulator so that the brim is shaped like a gear.