JP2697600B2 - Winding structure for induction magnet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding structure used for an induction electromagnetic device such as a transformer and a reactor.

[0002]

2. Description of the Related Art As a winding structure used for an induction magnet, a disk winding is sometimes used.
Usually, a plurality of windings are stacked in multiple stages to form a winding structure. FIG. 12 shows the conventional structure, wherein 1 is a section made up of windings wound in the form of a disk, 2 is an inner insulating cylinder, 3 is an outer insulating cylinder, and a section 1 is formed by winding between the insulating cylinders 2 and 3. Is arranged.

Since heat is generated in the windings due to resistance loss and the like, in order to cool this, an insulating cooling medium such as an insulating gas or insulating oil is forcibly circulated from below using a blower or a pump. ing. For the circulation, a disc-shaped inner barrier 4 and an outer barrier 5 are provided between the two insulating cylinders 2 and 3.
To form a plurality of areas.

[0004] The barriers 4 and 5 in each area are alternately attached to the insulating cylinders 2 and 3 so that the barriers 4 and 5 are provided.
The flow gaps 6 and 7 are alternately formed between and the insulating cylinder. Therefore, the cooling medium flows in a zigzag manner between the two insulating cylinders, as indicated by arrows in the figure. During this flow, the insulating medium flows between the sections, thereby cooling the windings of each section.

More specifically, the inner barrier 4 is attached to the inner periphery of the inner insulating tube 2 as shown in FIG. 14, and the outer periphery thereof is opposed to the inner periphery of the outer insulating tube 3 as shown in FIG. A flow gap 6 is formed therebetween. As shown in FIG. 15, the outer periphery of the outer barrier 5 is attached to the inner periphery of the outer insulating tube 3, and the inner periphery faces the outer periphery of the inner insulating tube 2 to form a flow gap 7 therebetween.

A duct 9 is formed by installing a plurality of spacers 8 at appropriate intervals along the circumferential direction of the section between adjacent sections and between the section and each barrier, thereby forming a cooling medium. To ensure circulation. For that purpose, the vertical spacers 10 and 11 are attached along each insulating cylinder, and the spacers 8 are supported from both ends by the vertical spacers 10 and 11 facing each other. 12 was formed on the inner periphery of the inner barrier 4, a groove longitudinal spacer 10 extends, also 13 formed on the outer periphery of the outer barrier 5, the vertical scan <br/> pacer 10 is a groove penetrating .

In such a configuration, when the flow of the cooling medium between the pair of upper and lower inner barriers 4 and the outer barrier 5 is examined, for example, as shown in FIG.
Most of the cooling medium that has flowed from the flow gap 7 formed between the inner insulating cylinder 2 rises along the wall surface of the inner insulating cylinder 2. Then, by colliding with the upper inner barrier 4, the flow is turned laterally to the flow gap 6. Thus, the flow rate of the cooling medium between the upper sections is higher than the flow rate between the lower sections. Therefore, the higher the section, the higher the cooling capacity of the cooling medium.

As a result, considering the temperature rise of the section 1 between the pair of upper and lower inner and outer barriers 4 and 5, the section closer to the lower barrier is higher in temperature than the section closer to the upper barrier. Rise, causing a substantial temperature difference between the two sections. Usually, it is necessary to design the winding to withstand the highest point temperature, so conventionally, the cross section of the wire is enlarged to reduce the loss, but according to this, the winding becomes extremely large, Therefore, there is a disadvantage that the entire device becomes large and expensive.

In particular, when an insulating gas such as SF6 gas is used as the cooling medium, there is a large imbalance in the flow velocity of the cooling medium along the vertical direction. That is, since the insulating gas is a gas, the cooling capacity is lower than that of the insulating oil,
In order to improve this, the amount of gas supplied is increased, and the flow velocity is increased. Also, the viscosity of the insulating gas is smaller than that of the insulating oil. Thus, the higher the flow velocity and the lower the viscosity, the greater the imbalance of the flow velocity along the vertical direction.

[0010]

SUMMARY OF THE INVENTION According to the present invention, when a plurality of sections stacked in multiple stages are cooled by flowing a cooling medium, the difference in the flow rate of the cooling medium between the sections is reduced. The aim is to reduce the highest point temperature in the inside.

[0011]

According to the present invention, an inner barrier and an outer barrier are provided between an inner insulating tube and an outer insulating tube and are alternately arranged in the vertical direction. In the area, a plurality of sections consisting of disk-wound windings are stacked in multiple stages, and between the outer circumference of the inner barrier and the outer insulating cylinder and between the inner circumference of the outer barrier and the inner insulating cylinder, from below. exchange the distribution gap of supply has been coming cooling medium
Cooling medium flows between both insulating cylinders in a staggered manner
In the winding structure for an induction electromagnetic device configured as described above,
Pass the flow gap at or near the flow gap
A part of the cooling medium is made to impinge on the
A folding member that inclines to the side of the vehicle.

[0012]

[Function] Cooling medium sent to the flow gap from below
A part of the flow collides with the folding member, and the flow thereof is inclined to the section side. Therefore, the flow of the cooling medium is bent toward the lower section of the sections stacked in multiple stages, thereby increasing the flow rate of the cooling medium between the lower sections. As a result, the imbalance in the flow velocity of the cooling medium between the upper and lower sections is reduced, and the temperature difference is averaged. Therefore, the highest point temperature in the winding is reduced.

This mode of operation will be described with reference to FIG. 10. In the example of this figure, a folding member 21 is provided on the inner insulating tube 2 side in the flow gap 7 between the inner periphery of the outer barrier 5 and the inner insulating tube 2. Configuration. A part of the cooling medium flowing from below toward the flow gap collides with the folding member 21. Therefore, the cooling medium is bent so as to be inclined toward the section side, as shown by the direction of the arrow. Due to this change in flow, the flow velocity of the cooling medium flowing between the lower sections increases, whereby the lower sections are cooled. The same applies to a case in which a flow member is provided on the outer insulating cylinder 3 side in the flow gap 6 between the outer periphery of the inner barrier 4 and the outer insulating cylinder 3.

[0014]

FIG. 1 shows an embodiment of the present invention. Note that the same reference numerals as in FIG. 12 and subsequent drawings denote the same or corresponding portions. According to the present invention, folding members 21 and 22 are provided near the flow gaps 6 and 7. Although the means for installing the folding members 21 and 22 is arbitrary, the configuration shown in FIG. 1 shows a configuration provided integrally with the barriers 5 and 4.

FIGS. 2 and 3 show a specific example. In FIG. 2, a folding member 21 is integrally formed on the inner peripheral side of the outer barrier 5. Flow gaps 7 are formed at appropriate intervals. Grooves 23 are formed between the flow gaps 7 through which the vertical spacers pass. Similarly, in FIG. 3, a folding member 22 is integrally formed on the outer peripheral side of the inner barrier 4, and in this case, a flow gap 6 is formed inside the folding member 22 at an appropriate interval. Grooves 24 are formed between the flow gaps 6 through which the vertical spacers pass. When the folding members 21 and 22 are integrally provided with the outer barrier 5 and the inner barrier 4 in this manner, the barriers 5 and 4 are attached between the insulating cylinders 2 and 3 so that the respective folding members 2 and 22 are attached.
1 and 22 can be installed in each of the flow gaps 7 and 6.

Each folding member may be formed independently of each barrier. An example is shown in FIG. The example of FIG.
An example of the folding member 21 provided in the inner insulating cylinder 2 is shown.
Are formed in an arc shape along the outer periphery of the rim, and leg portions 25 are provided at both ends thereof. A plurality of the folding members 21 are attached to the outer periphery of the inner insulating cylinder 2 at an appropriate interval at an inner periphery thereof. Then, the tip of each leg 25 is butted against the inner periphery of the outer barrier 5. In this case, a flow gap 7 is formed between the flow member 21 and the barrier 5. The folding member attached to the flow gap 6 may be formed by turning the folding member of FIG. 4 upside down. In this way, by separately forming the barrier, the installation position can be finely adjusted with respect to the flow gap, and the flow rate distribution of the cooling medium can be finely adjusted.

Further, as shown in FIG. 5, the ends of the legs 25 may be connected by a connecting member 26. It is attached to the outer periphery of the inner periphery of the inner insulating tube 2 in this case Oriryu member 21, the connecting member 26 or Tsukiawasu to the inner periphery of the outer barrier 5, or may be attached by, for example, superimposing the inner periphery thereof. The folding member 22 attached to the flow gap 6 may have the same shape as that shown in FIG.

FIGS. 4 and 5 show examples in which a plurality of folding members are used, but they may have a configuration in which they are connected to each other, and an example is shown in FIG. In this case, the grooves 23 need to be formed at appropriate intervals. The attachment can be made as in the case of FIG. Flow gap 6
A similar shape can be used for the folding member 22 to be attached to the groove, but in this case, the groove 24 has a shape protruding inward.

The folding members 21 and 22 can be attached using the spacer 8. That is, as shown in FIG. 7, the folding member 21 shown in FIGS. 4 to 6 may be mounted on the surface of the spacer 8 and pressed down by the section 1.

Alternatively, as shown in FIG. 8, the folding member 21 shown in FIG. 4 may be attached so as to be sandwiched by spacers 8 above and below the section 1.
FIG. 9 is a plan view of the attachment state, in which each leg 25 of the folding member 21 faces the end of the adjacent spacer 10,
In this state, mounting is performed by sandwiching the upper and lower spacers 8. The same applies to the folding member 22 attached to the flow gap 6.

[0021] Next will be described an experimental example of the present invention by FIG. The inclination angle of the flow of the cooling medium passing through the flow gap to the section side by the folding member is a distance between the insulating cylinder and the end of the section (therefore, the width of the spacer 10) is a (30 mm in the experimental example). When the width of the folding member 7 is b, k is approximately obtained from k = (ab) / a. Here, in a winding structure in which a winding having 48 turns is defined as one section, forty sections are stacked in the axial direction, and a barrier is inserted for every eight sections, b = a / 3 (that is, k = 2/3) Section No.1 to No
In 8, the flow rate of the cooling medium between the sections was determined.
However, the gas flow rate of the entire winding was 6 cubic meters per minute.

The results are shown in FIG. For comparison, the flow rate of the cooling medium was similarly obtained for the conventional configuration without the folding member. The result is shown in FIG. As is apparent from a comparison between the two results, the flow rate between the lower sections is significantly higher in the case of the present invention, and the flow rate distribution is relatively uniform as a whole.

When a current of 3.4 A per square millimeter of the rated current density was applied to the winding structure, the temperature rise value with respect to the gas temperature of each section was measured, and the results shown in Table 1 were obtained. Was. For comparison, measured values in the above-described conventional configuration are also shown. As can be seen, the peak temperature and the average temperature in the case of the present invention are both about half lower than those in the conventional configuration.

[0024]

[Table 1]

Further, the same test was conducted for a configuration having different section heights and distances between sections. As a result, when the section height and the distance between sections were large, k was set to 2/3. When the height is larger, the angle θ of the main flow of the cooling medium becomes smaller. Conversely, when the height of the sections and the distance between the sections are small, the angle θ becomes larger by making k smaller than 2/3. It is effective in reducing the temperature. Therefore, as the range of k, 0.5 ≦ k ≦ 0.8 is appropriate, and in particular, 0.6 ≦ k
When ≦ 0.7, the average temperature and the highest point temperature of the winding become the lowest.

When the number of sections between the barriers is large, it is effective to increase k. In this case, the range of k is suitably 0.6 ≦ k ≦ 0.8. Conversely, if the lower section needs to be cooled,
Is suitably 0.5 ≦ k ≦ 0.7.

[0027]

As described above, according to the present invention ,
Many areas within the area separated by the side and outer barriers
Coolant flow rate between each section of the stack
The temperature between each section.
Differences can be averaged and therefore within sections
The maximum temperature can be reduced. In addition, it is bent
Flow rate is a part of the whole, and the temperature between each section
The effect that the pressure loss required for averaging the difference is small .

[Brief description of the drawings]

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

FIG. 2 is a partial plan view of an outer barrier.

FIG. 3 is a partial plan view of an inner barrier.

FIG. 4 is a plan view showing an example of a folding member.

FIG. 5 is a plan view showing another example of the folding member.

FIG. 6 is a partial plan view showing still another example of the folding member.

FIG. 7 is a cross-sectional view showing an example of a mounting state of a folding member.

FIG. 8 is a cross-sectional view showing another example of the mounting state of the folding member.

FIG. 9 is a plan view of FIG.

FIG. 10 is a partial cross-sectional view for explaining the operation of the present invention.

FIG. 11 is a diagram showing experimental results in the example of the present invention.

FIG. 12 is a partial sectional view of a conventional example.

FIG. 13 is a partial plan view of FIG.

FIG. 14 is a partial plan view of the inner barrier of FIG.

FIG. 15 is a partial plan view of the outer barrier of FIG.

FIG. 16 is a partial cross-sectional view for explaining the operation of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Section 2 Inner insulating tube 3 Outer insulating tube 4 Inner barrier 5 Outer barrier 6 Flow gap 7 Flow gap 21 Folding member 22 Folding member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mikio Kyono 47, Umezu Takaune-cho, Ukyo-ku, Kyoto-shi Inside (72) Inventor Shuichi Nogawa 47-Umezu Takaune-cho, Ukyo-ku, Kyoto Nissin Electric Machinery Co., Ltd. Inside

Claims (1)

(57) [Claims] 1. A disk winding is provided in an area between an inner insulating cylinder and an outer insulating cylinder and partitioned by an inner barrier and an outer barrier alternately arranged in a vertical direction. While overlapping a plurality of sections in multiple stages, between the outer circumference of the inner barrier and the outer insulating cylinder and between the inner circumference of the outer barrier and the inner insulating cylinder,
Alternating gaps for cooling medium supplied from below
The cooling medium flows between the insulating cylinders in a staggered manner.
In an induction device for winding structure formed by urchin, the flow
A part of the cooling medium passing through the flow gap collides with the flow gap or a position near the flow gap, and the flow is divided into the plurality of sections.
A winding structure for an induction electromagnetic device, characterized in that a winding member is provided on the side of the induction coil.