JPH0864425A - Winding cooling structure of gas-insulated device - Google Patents

Abstract

PURPOSE: To provide a winding cooling structure which reduces pressure loss inside a winding and enables use of a standard blower in a gas-insulated device. CONSTITUTION: The title device consists of a vertical duct 7 or 7' formed between a vertical spacer 6 or 6', a horizontal duct 9 formed between coil sections 4 and a zigzag barrier 3 arranged every coil section. A space between the zigzag barrier 3 is made one block and a means 10 for making cooling gas flow in zigzag in the blocks one by one and for blocking up gas flow flowing to the horizontal duct 9 in a block at a proper position is provided for reducing the number of zigzags in a gas path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a winding of electric equipment such as a gas forced circulation type electric power transformer and a reactor.

[0002]

2. Description of the Related Art A conventional cooling structure for a power transformer or a winding of a reactor using a disk winding is shown in FIGS. 7 and 8 and briefly described. 7A is a vertical sectional view, FIG. 7B is a horizontal sectional view, and FIG. 8 is a development view of the gas insulation device shown in FIG. 7. As shown in FIG. 7, lateral spacers arranged at predetermined intervals in the same manner as the outer vertical spacers 6 and the inner vertical spacers 6'arranged at predetermined intervals in a region surrounded by the inner insulating cylinder 1 and the outer insulating cylinder 2. The coil section 4 is installed in a plurality of stages (depending on the rating of the equipment, hundreds of tens of stages for large capacity) through 8 and the coil section 4 is arranged outside every several stages (usually 5 to 10 coil sections). Each of the barrier 3 and the inner barrier 3'is sequentially arranged, and the SF ₆ gas flowing from the lower part is fed in, and the fed gas is directed to the vertical duct 7, 7'and the lateral duct 9 between the coil sections as shown by an arrow 5 in the figure. It has a structure that cools the winding by flowing zigzag.

[0003]

In such a structure, the pressure loss caused by circulating the SF ₆ gas in the winding is mainly caused by the zigzag flow in the winding, and the outer barrier 3 and the inner barrier It is substantially proportional to the number of blocks surrounded by 3'and the vertical spacers 6 and 6 '(a blank portion surrounded by vertical and horizontal lines in FIG. 8) in the vertical direction. The number of coil sections in the block needs to be usually 5 to 10 in order to make the flow rate of SF ₆ gas in the lateral duct between the coil sections uniform in the block as much as possible. Therefore, the number of blocks increases in the case of a large capacity device, and the pressure loss in the winding increases, so that the standard blower (S
A pump for forcibly circulating the F ₆ gas has a problem in that it is impossible in terms of capacity and an expensive non-standard blower is used.

As a means for solving this problem, it is conceivable to reduce the number of blocks to reduce the pressure loss in the winding, but to reduce the number of blocks, that is,
If the number of sections in one block is increased, the imbalance of the flow rate of SF ₆ gas between the sections in the block becomes large, and accordingly, the temperature distribution in the winding also becomes non-uniform, resulting in extremely uneconomical winding. There is a problem that it will become.

Also in the small-capacity device, it is difficult to select the optimum one considering the pressure loss in the winding wire because there are few standard blowers, and a large one with a margin is usually used. Selected and uneconomical.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a winding cooling structure for a gas-insulated equipment, which reduces pressure loss in the winding and can use a standard blower. .

[0007]

This object is achieved by stacking disk windings and providing gas flow sealing means in a portion of the lateral duct between the stacked coil sections.

[0008]

The cooling gas passage is divided into a plurality of blocks by the vertical spacers and the zigzag barrier, and the blocks at appropriate positions are provided with the gas flow blocking means to prevent the lateral gas flow from flowing.
It is possible to optimally reduce the pressure loss of the entire winding while limiting the temperature rise of the winding and reducing the number of zigzags of the gas flow.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Throughout the drawings, the same parts and parts corresponding to the same parts are designated by the same reference numerals.

FIG. 1B is a transverse sectional view of an embodiment of the present invention, and FIG. 1A is a vertical spacer No. 1 shown in FIG. 6 and 7
FIG. 2 is a vertical cross-sectional view of FIG. 2, and FIG. FIG.
In, 1 is an inner insulating cylinder, 2 is an outer insulating cylinder, 3 is a zigzag barrier, 4 is a coil section, 5 is a gas flow,
6 and 6'are vertical spacers, 7 and 7'are vertical ducts formed by being partitioned by the vertical spacers 6 and 6'in the circumferential direction, 8 are horizontal spacers, and 9 are axial partitions by the zigzag barrier 3. Lateral duct, 10 is a blocking barrier, 1
Reference numeral 1 denotes a vertical spacer for fixing the blocking barrier 10.

In the present invention, the block means the coil section 4 sandwiched between two zigzag barriers 3-3 'in the axial direction, and the vertical spacers 6, 6'in the circumferential direction.
It refers to one having one vertical duct 7, 7'that is equally divided by.

Therefore, in the winding of this embodiment, as shown in FIG.
No. in the axial direction as shown in. 1 to No. 10 (horizontal line in FIG. 2) has 10 zigzag barriers, and No. 10 in the circumferential direction. 1 to No. Since it is composed of eight vertical spacers indicated by 8 (vertical line in FIG. 2), the number of blocks is 72.

In FIG. 2, the shaded blocks indicate blocks in which the blocking barrier 10 is arranged. The blocking barrier 10 is for blocking the flow of the gas flow to the lateral duct 9. The block in the vicinity of the gas inlet is spaced by two blocks in the circumferential direction, and is axially displaced from the bottom in the circumferential direction. That is, it is arranged from the cooling gas inlet to the third block.

The reason why the block to be closed is selected near the gas inlet is that the temperature of the winding rises in the vicinity of the normal gas inlet because the heating value of each coil section deprives the heat generation amount of each coil section while the cooling gas passes through the winding. This is because there is a margin in terms of space, and the reason for providing blocks that block two blocks in the circumferential direction is that the heat generated in the blocked blocks is blocked on both sides using the heat conduction of the wires. This is to dissipate heat from the unblocked block into the gas.

The gas flow flowing in from the lower part of the winding is closed by vertical spacers 6 and 6'in the circumferential direction, and flows in the vertical ducts 7 and 7'and the lateral duct 9 which are independent in the circumferential direction. Flow zigzag in the axial block by the zigzag barrier 3, but do not flow in the lateral duct 9 in the block in which the blocking barrier 10 is arranged, but in the vertical duct 7 or 7 '.
Will flow as is.

In this embodiment, a blocking barrier 10 is used as the gas flow blocking means, and the blocking barrier 10 is axially moved to 1
It is arranged in blocks and independent in the circumferential direction, and the pressure loss is not blocked by reducing the zigzag flow generated by the zigzag barrier in the axial direction for each vertical duct that is a parallel circuit for pressure loss. It is reduced to about 8/9 compared to that of one, and the increase in temperature caused by the blockage is reduced by scattering the blockade barriers 10 in the circumferential direction,
The pressure loss and temperature rise of the winding are optimized.

In the figure, the sealing barrier 10 uses a vertical spacer 11 for fixing, but instead of the vertical spacer 11 for fixing, a vertical spacer 6 or 6'is used for fixing, and further, a coil section is used. It can also be fixed by bonding to 4. Further, although the blocking barrier 10 is provided outside the coil section 4 in the drawing, it may be provided inside the coil section 4.

In the embodiment of FIG. 1, a blocking barrier is used as the blocking means, but another example of the blocking means is shown in FIG. FIG.
Shows one blocking means in which a blocking spacer 12 is inserted between the coil sections to block the lateral flow of the gas stream. The figure (a) shows the longitudinal cross-sectional view of the block which inserted the blocking spacer 12, the figure (b) shows the enlarged view of an insertion part, and the figure (c) shows the cross-sectional view. As is clear from the figure, the gas that is about to flow in the lateral direction is blocked by the blocking spacers 12 and cannot flow. In addition, in FIG. 3, both ends of the blocking spacer 12 are sandwiched and fixed to the horizontal spacers 8, but they may be fixed to the coil section 4 by adhesion.

In the embodiment shown in FIGS. 1 and 3, the blocking barrier 10 and the blocking spacer 12 are used as blocking means for blocking the lateral flow of the gas flow. Thus, when the blocking barrier 10 or the blocking spacer 12 is used as the blocking means, the zigzag barrier between the block in which the blocking barrier 10 or the blocking spacer 12 is arranged and the block above it can be omitted. .

On the other hand, a zigzag barrier may be used as a blocking means for blocking the lateral flow of the gas stream without using new components such as the blocking barrier 10 and the blocking spacer 12. In this case, if zigzag barriers with blocking parts on the same side are used as zigzag barriers on both sides of the block to be blocked, the gas flowing in that block does not flow in the horizontal duct but flows in the vertical duct and flows into the next block. Can be understood by removing the blocking barrier 10 shown in FIG.

In the present invention, since the block means is provided for each block, the zigzag pattern is an arbitrary pattern depending on the circumferential position. Therefore, according to this pattern, the gas flow block part of the zigzag barrier is provided inside or outside. Must be set freely in the circumferential direction.

An example of the zigzag barrier is shown in FIG.
The zigzag barrier shown in (a) of FIG. 4 is a fan-shaped zigzag barrier divided into blocks, in which the blocking portion 13 is provided outside and inside, and the blocking of the gas flow can be freely set in the circumferential direction. it can. Further, the fan-shaped zigzag barriers can be combined into an integrated ring shape.
(B) shows an example of a ring-shaped zigzag barrier in which every other closed portion 13 is provided on the inner side and the outer side.

In the present invention, the block to be closed can be set arbitrarily in consideration of the balance between the pressure loss of the winding and the temperature rise. An example thereof is shown in exploded views in FIGS. 5 and 6. The shaded portions in each figure are closed blocks, the vertical lines are vertical spacers, and the horizontal lines are zigzag barriers.

FIG. 5 shows an example in which the zigzag passages in the axial direction coexist with and without the blocking block. The pressure loss between the inlet and the outlet of the winding wire in this example is equal in each axial zigzag passage (8 passages of Q _{1 to} Q ₈ ). The gas flow rates Q _{1 to} Q _{8 in} each passage are set, and the gas flow rate Q _T flowing in one phase is
Assuming the pressure loss ΔP in the winding wire and the conventional pressure loss ΔP _D , the approximate pressure loss can be calculated by the equations (1) to (5).

[0025]

[Equation 1]

The expression (9/10) K in the equation (4) indicates that the coefficient K of the pressure loss can be reduced to about (9/10) K by closing one of the 10 blocks in the axial direction. When the block is blocked, the pressure loss coefficient is smaller than that in the unblocked block, so the flow rate Q
_a becomes larger than Q _T / 8, and conversely, the flow rate Q _b at the unsealed portion becomes smaller than Q _T / 8. Therefore, the pressure loss is slightly larger than the pressure loss 9/10 when the axial block is blocked at one place, but in the example of the figure, the ratio with the conventional type is ΔP / ΔP _D = 0.9235, which is effective. .

Further, in FIG. 6, the block is divided into 16 equal parts in the circumferential direction and 10 blocks in the axial direction to form a blocking block as shown by the diagonal lines in the figure. Table 1 shows experimental data on temperature rise and pressure loss in this case in comparison with the conventional example.

[0028]

[Table 1]

The gas flow rate in the winding wire is 6 m ³ / min (for one phase)
The winding loss is 34 KW / phase. The temperature rise value indicates the rise value from the gas average temperature, and the value indicates the maximum point temperature value including the circumferential direction for each block in the axial direction.

As shown in Table 1, in this example, the maximum temperature of the winding is the same value as in the conventional case, and only the pressure loss in the winding can be reduced (only 1 block out of 10 blocks in the axial direction is blocked by about 9/10). The rational design has been made in consideration of the blower's rating. When the number of divisions is larger than the number of divisions in the circumferential direction and the number of divisions in the axial direction shown in this example, optimization can be performed in consideration of a more detailed temperature distribution, and the effect is great.

[0031]

As described above, in the winding cooling structure for gas-insulated equipment of the present invention, gas is prevented from flowing in a part of the lateral duct between the coil sections, so that the temperature rise of the winding is limited. At the same time, the pressure loss in the winding can be reduced, and the rational design can be performed in consideration of the standard blower rating.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gas insulation device equipped with the present invention.

FIG. 2 is a development view of the gas insulation device shown in FIG.

FIG. 3 is a sectional view of a block in which a blocking spacer is inserted.

FIG. 4 is a plan view of a zigzag barrier used in the present invention.

FIG. 5 is a development view showing an example of arrangement of blocking blocks.

FIG. 6 is a development view showing an example of arrangement of blocking blocks.

FIG. 7 is a cross-sectional view of a conventional gas insulation device.

FIG. 8 is a development view of the gas insulation device of FIG.

[Explanation of symbols]

 1 Inner Insulation Tube 2 Outer Insulation Tube 3 Zigzag Barrier 4 Coil Section 6, 6'Vertical Spacer 7, 7'Vertical Duct 8 Transverse Spacer 9 Transverse Duct 10 Blocking Barrier 12 Blocking Spacer

Claims (1)

[Claims] 1. A winding cooling structure of a gas-insulated device in which disk winding windings are laminated and cooling gas is passed through a transverse duct between the laminated coil sections to cool the winding, and a part of the transverse duct between the coil sections is provided. A winding cooling structure for a gas insulation device, characterized in that a gas flow blocking means is applied to the.