JP3138852B2 - Transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an insulating oil-filled transformer,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field for releasing heat loss generated from a coil winding portion in a transformer insulated by a fluid such as a gas-insulated transformer.

[0002]

2. Description of the Related Art In a transformer, there is a relationship as shown in Equation 1 between the temperature rise value θ at equilibrium, the total loss W and the heat radiation area S. Therefore, in the case of a conventional transformer, such as an oil-immersed transformer, in the case of a model having a small capacity, the absolute value of the total load loss is small. No special measures are required to maintain the temperature of the insulating oil to be kept within a predetermined range. However, in the case of a model having a large capacity, the total loss W in the transformer becomes large, so the temperature rise value θ at the time of equilibrium is increased. Needs to be increased to maintain the heat radiation area S in a predetermined range.

[0003]

(Equation 1)

In equation (1), θ represents a temperature rise value at the time of equilibrium, k represents a radiation coefficient, W represents total loss, and S represents a radiation area.

Therefore, in the conventional transformer, in order to maintain the temperature rise within a predetermined range, a rib for heat radiation is provided on the surface of the case of the transformer body to increase the heat radiation area, that is, the surface area, or to reduce the heat radiation. Measures were taken to provide a panel.

A conventional transformer will be described with reference to FIG. 7, reference numeral 101 denotes a transformer main body having a coil winding portion, and 102 denotes a transformer main body 1.
01 is a transformer case, and 103 is a transformer case.
Transformer insulating oil 104 housed in the housing 02 together with the transformer main body 101 is a heat radiating rib formed on the surface of the transformer case 102 in order to increase the surface area of the transformer case 102.
The size of 4, that is, the height and the length are designed to satisfy the relational expression of Formula 1.

In this case, the heat generated in the coil winding portion of the transformer main body 101 moves to the upper part in the transformer case 102 by the transformer insulating oil 103,
2 and is radiated and cooled by the wall surface of the transformer case 102 and the wall surface of the radiation rib 104. The transformer insulating oil 103 that has been radiated and cooled moves to the lower part in the transformer case 102, and conveys the heat generated in the coil winding portion to the upper part in the transformer case 102 again.

[0008] Further, by disposing a heat pipe between the coil winding portions, the heat generated in the coil winding portion is radiated to the outside through the heat pipe. No. 62-42513, Jiko 63
Japanese Patent Application Laid-Open No. 55-96626), or a transformer having a guide plate for oil convection provided inside a transformer case has been proposed.

[0009]

In the conventional transformer, the heat generated from the coil winding of the transformer body is dissipated by natural convection of the transformer insulating oil. Is established, the heat radiation area S, that is, the surface area of the transformer case 102 is the law of heat radiation.

Therefore, when the capacity of the transformer is increased to a certain value or more and the total loss W increases to dissipate heat, it is necessary to increase the size of the heat dissipating rib 104 in order to increase the heat dissipating area S. There is a problem in that the outer shape of the transformer case 102 for housing the main body 101 is increased, the installation area is increased, and the manufacturing cost is increased.

When a heat pipe is used, a sufficient cooling effect cannot be obtained, and the cost is high. Further, when a convection guide plate is provided, the cooling effect is low for economic efficiency. There was a problem that cannot be expected.

The present invention efficiently cools the transformer main body by efficiently dissipating the heat generated from the coil winding portion of the transformer main body, and reduces the temperature rise to prevent the performance from deteriorating.
It is another object of the present invention to provide a transformer that is small, lightweight, and cost-effective without increasing the size of the device itself.

[0013]

In the transformer device of the present invention, in order to solve the problems] it includes a cooling unit having a heat radiating body and the heat-collecting body consisting of a heat pipe and a plurality of flat plates, in opposition to the radiator set
A cooling fan, and a center of the cooling fan.
Providing a ventilation hole in the flat plate arranged in the vicinity is a means for solving the above problem.

Further, it is possible to form a radiator provided with a ventilation hole by a net-like flat plate, and the opening area of the ventilation hole provided in the radiator occupies 3 to 30% of the area of the radiator. Is preferred.

If a cooling fan facing the cooling unit, particularly a cooling fan facing the air blowing side, is provided, the heat can be efficiently radiated, and the blown air is compressed by the air blowing side of the cooling unit. It is effective to provide a ventilation duct so as to directly contact the outer surface of the case.

Further, a cooling fan can be provided in the ventilation duct, a radiation fin can be formed on the outer surface of the transformer case into which air is introduced, or a plate-shaped heat pipe can be provided. .

Further, a cooling unit in which the heat collector is immersed in an electrically insulating fluid is mounted on a transformer body and a transformer case containing the electrically insulating fluid, and the heat collector is positioned above or in parallel with the transformer body. You can also.

Further, it is effective to form a lower step on the upper surface of the transformer case, attach a cooling unit to this step, and arrange the heat collector of this cooling unit in parallel with the transformer body.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The means as described above can be attached to, for example, a power receiving and distribution facility. The means includes a heat pipe, a radiator having a flat plate provided with ventilation holes in a fin shape, A cooling unit having a heat collector and a transformer body attached to a transformer case containing a transformer main body and electric insulating oil,
This heat collector is immersed in electrical insulating oil in a state of being positioned above or in parallel with the transformer main body, and a ventilation duct provided with a cooling fan is provided on the air blowing side of the cooling unit,
The blown air is in direct contact with the outer surface of the transformer case provided with the radiation fins or the plate-shaped heat pipe.

By the means, the heat generated in the coil winding portion of the transformer body is transferred from the heat collector to the radiator through the heat pipe, and when the heat is radiated from the radiator,
It is forcibly dissipated by the air sucked in by the cooling fan and acts to form a circulation path in which the air is cooled by contacting the outer surface of the transformer case by the ventilation duct.

Further, the air sucked by the cooling fan flows uniformly and smoothly without pressure loss at the radiator due to the presence of the ventilation holes, and can radiate heat efficiently.

Next, a specific embodiment will be described below. Hereinafter, an embodiment in the case of an insulating oil-filled transformer will be described in detail with reference to FIGS.

(Embodiment 1) In FIG. 1 showing a schematic configuration of an insulating oil-immersed transformer, and FIG. 2 showing a top view of a cooling unit provided in the insulating oil-immersed transformer, reference numeral 1 denotes a coil winding portion. Transformer body 2 having transformer and transformer insulating oil 3
Is a plate-shaped heat collector immersed in transformer insulating oil 3 and is located above transformer main body 2. Reference numeral 5 denotes a heat pipe to which a heat collector 4 is attached at a lower end, and a heat radiator 7 which is configured by arranging a plurality of flat plates 6 in parallel at an upper portion. The cooling unit 9 is a cooling fan arranged on the air blowing side opposite to the cooling unit 8, and 10 is a ventilation hole for adjusting the wind pressure formed in the flat plate 6 constituting the radiator 7.

The radiator 7 having the ventilation holes 10 is formed in a fin shape by attaching a plurality of flat plates 6 provided with the ventilation holes 10 above the center of the heat pipe 5. A cooling fan 9 is arranged so that the heat pipe 5 is forcibly cooled by suction air. The heat collector 4 is mounted below the center of the heat pipe 5. The heat collector 4 and the transformer main body 2 are arranged so as to be immersed in the transformer insulating oil 3 housed in the transformer case 1.

Next, the operation will be described. The heat energy generated by the transformer body 2 is collected by the heat collector 4 via the transformer insulating oil 3, and then the heat pipe 5
Is transmitted to the radiator 7 and is radiated from the radiator 7.
At this time, the heat dissipation is promoted by the air sucked by the cooling fan 9 and flowing between the flat plates 6 constituting the radiator 7.

In this case, if the ventilation holes 10 do not exist in the radiator 7, the speed of the suction air flowing between the respective flat plates 6 differs depending on the location due to the characteristics of the cooling fan 9, the mounting position, and the like. The pressure generated by the air flow also varies depending on the location, and the air does not uniformly and smoothly flow through the radiator 7, so that the radiation efficiency is reduced.

However, if the radiator 7 has the ventilation holes 10, the flow path of the suction air formed between the flat plates 6 is communicated, so that the speed difference of the air flow is eliminated and the pressure difference is generated. The air flows uniformly and smoothly through the heat radiator 7, and the speed of the air flow is constant, so that the heat radiation efficiency is improved. For example, even if the speed of the air flow sucked by the cooling fan 9 is 1.5 m / s or more, highly efficient heat radiation is possible.

If the opening area of the ventilation hole 10 is too large, the area of the heat radiator 7 is reduced and the heat radiation effect is reduced. If the opening area is too small, it is difficult for the flat plates 6 to communicate with each other, and a smooth air flow is obtained. Can not be expected, so the radiator 7
Is preferably about 3 to 30% of the area.

When the cooling fan 9 is arranged on the air blowing side of the radiator 7 to cool the radiator 7 with the suction air, the cooling fan 9 is less affected by the airflow characteristics of the cooling fan 9 and the cooling fan 9 is hardly affected. The airflow flowing between them becomes smooth, and the heat radiation capacity of the cooling unit 8 is improved by about 5% as compared with the case where the air radiator 7 is arranged on the air suction side.

As described above, the heat energy generated from the transformer main body 2 is collected by the heat collector 4 via the transformer insulating oil 3 and is conveyed to the radiator 7 through the heat pipe 5. In this case, the cooling fan 9 is dissipated by the air sucked in. At this time, since the ventilation holes 10 are formed in the radiator 7, a speed difference occurs in the suction air flowing between the plurality of flat plates 6. Is eliminated, and the heat radiation efficiency can be increased. The heat can be sufficiently radiated by natural convection of air only through the ventilation hole 10 provided in the heat radiator 7 without mounting the cooling fan 9.

(Embodiment 2) In FIG. 3, which shows a schematic diagram of the configuration of an insulating oil-immersed transformer, reference numeral 11 denotes a radiator constituted by arranging a plurality of mesh plates 12 in parallel, 13 denotes a heat collector 4, and heat pipes. 5 is a cooling unit including the heat radiator 11.

The heat radiator 11 has a structure in which a plurality of net plates 12 are attached above the center of the heat pipe 5, and the heat collector 4 is attached below the center of the heat pipe 5,
The heat collector 4 and the transformer main body 2 are immersed in the transformer insulating oil 3 in the transformer case 1, so that the heat energy generated from the transformer main body 2 passes through the transformer insulating oil 3. The heat is collected by the heat collector 4 and the heat radiator 1 is passed through the heat pipe 5.
1 and is naturally dissipated in the radiator 11.

Next, the operation will be described. The heat energy generated by the transformer body 2 is collected by the heat collector 4 via the transformer insulating oil 3, and then the heat pipe 5
Is transferred to the heat radiator 11, and the air that has taken the thermal energy from the heat radiator 11 is supplied to the mesh plate 1 constituting the heat radiator 11.
Natural convection can be efficiently induced by the second mesh, and heat can be radiated with high heat radiation capability.

When the transformer load current is 70% or less, the heat energy generated from the transformer body 2 is
2 can be sufficiently dissipated by natural convection of air. However, when the transformer load current is 70% or more of the rated value, the cooling unit 1 as in the first embodiment is used.
A cooling fan opposed to the cooling fan 3 is disposed on the air blowing side, and heat energy generated from the transformer main body 2 is radiated from the radiator 11 by forced cooling by the suction air of the cooling fan and natural convection by the radiator 11. It is effective.
Since the air sucked by the cooling fan flows through the flow path communicated by the mesh of the mesh plate 12, the flow becomes uniform and smooth.

As described above, the heat energy transferred to the heat radiator 11 is radiated by the heat radiator 11. At this time, the air is efficiently convected by the mesh of the mesh plate 12 constituting the heat radiator 11. Therefore, the heat radiation efficiency is improved.

(Embodiment 3) In FIGS. 4 and 5, which show schematic diagrams of a configuration of an insulating oil-immersed transformer, 14 is a ventilation duct for introducing air blown out of the cooling unit 8 to the outer surface of the transformer case 1. Reference numeral 15 denotes a radiation fin formed on the outer surface of the transformer case 1.

The heat energy generated by the transformer main body 2 is collected by the heat collector 4 via the transformer insulating oil 3 and then transmitted to the radiator 7 by the heat pipe 5 to be radiated by the radiator 7.
Dissipated from At this time, the heat dissipation is promoted by the air sucked by the cooling fan 9 and flowing between the flat plates 6 constituting the radiator 7. The air that promoted this heat dissipation
The air is introduced into the outer surface of the transformer case 1 by the ventilation duct 14, and the outer surface of the transformer case 1 is forcibly cooled (FIG. 4).
reference).

Thus, the ventilation duct 14 is attached,
If the outer surface of the transformer case 1 is forcibly cooled by the air blown from the cooling fan 9, a heat radiation effect with higher cooling efficiency can be expected.

Further, by forming the radiation fins 15 on the outer surface of the transformer case 1 into which air is introduced by the ventilation duct 14, heat can be radiated with higher cooling efficiency (see FIG. 5).

The radiator 11 described in the second embodiment can be used as the radiator 7. Further, if a plate-like heat pipe is used instead of the radiator fin 15, the outer surface of the transformer case 1 can be used. Can be more uniformly cooled.

In the above configuration, the cooling effect of the ventilation duct 14, the radiating fins 15, and the plate-shaped heat pipe is evaluated as the degree of temperature rise in the transformer main body 2 having the coil winding as shown in Table 1. .

[0042]

[Table 1]

As is clear from Table 1, when the ventilation duct 14, the radiating fins 15, or the plate-shaped heat pipe are attached, the temperature rise of the transformer main body 2 is small, and the cooling effect is exhibited.

As described above, the heat energy generated in the transformer main body 2 is dissipated by the radiator 7, and the air blown out of the radiator 7 is cooled by the cooling fan 9 into the ventilation duct 1.
Since it is introduced to the outer surface of the transformer case 1 through the cooling medium 4 and cooled, the cooling can be performed with high efficiency. Further, when the heat radiating fins 15 or plate heat pipes are attached to the outer surface of the transformer case 1 into which the air is introduced, the cooling effect is further improved.

(Embodiment 4) In FIG. 6, which shows a schematic diagram of a configuration of an insulating oil-immersed transformer, reference numeral 16 denotes a transformer case having a lower step 17 formed on the upper surface, 18 denotes a heat collector 4 and a heat pipe 5. And a cooling unit provided with a heat radiator 7 and a cooling fan 9 opposed to the heat radiator 7, wherein a portion of the heat radiator 7 and the cooling fan 9 protruding outside the transformer case 1 is located at the step 17. It is attached as follows.

In this case, since the heat collector 4 and the transformer body 2 located inside the transformer case 16 of the cooling unit 18 are arranged in parallel, the contact between the heat collector 4 and the transformer insulating oil 3 The area is increased and the cooling effect is further improved. In particular, when the height of the transformer is specified, the cooling unit 18 located outside the transformer case 16 is effective without protruding from the entire transformer.

For example, the height is 300 mm and the surface area is 0.1 mm.
The same size as (A) when the heat collector 4 and the transformer main body 2 are arranged in parallel using the transformer case 16 using the 54 m ² plate-shaped heat collector 4 and the step portion 17. Of the cooling unit 18 in the case where the heat collector 4 is used, the transformer case 1 having the same height as the transformer case 16 is used, and the heat collector 4 is arranged above the transformer body 2 (B). Are as shown in Table 2. The heat collector 4 and the transformer insulating oil 3
In the former case (A), the contact height was 270 mm, and in the latter case (B), the contact height was 180 mm.

[0048]

[Table 2]

As is apparent from Table 2, by increasing the contact area between the heat collector 4 and the transformer insulating oil 3, the heat radiation efficiency of the cooling unit 18 is improved, and an excellent cooling effect is exhibited.

The height of the step 17 is determined by the transformer insulating oil 3.
It was also confirmed that 50 mm or less was effective from the oil level.

The heat radiator 7 described in the second embodiment can be used as the heat radiator 7.

The transformer described in the above embodiment is
It is effective to install it on the power receiving and distribution equipment, and as for the transformer, the case of the insulating oil-filled transformer has been described, but it should be applied to the transformer which electrically insulates with a fluid such as a gas insulated transformer. Can be.

[0053]

According to the present invention, the heat generated by the transformer main body collected by the heat collector immersed in the electrically insulating fluid is supplied to the cooling fan through the heat pipe by the means described above.
Vent holes are provided in a flat plate located near the center of the fan and heat is radiated by the heat radiating plate, so that the flow of air flowing through the radiator is made uniform, the speed is made constant, and the heat radiating effect is enhanced, A transformer with a small temperature rise can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an insulating oil-immersed transformer according to Embodiment 1 of the present invention.

FIG. 2 is a top view of a cooling unit provided in the insulating oil-filled transformer.

FIG. 3 is a schematic configuration diagram of an insulating oil-filled transformer according to Embodiment 2 of the present invention.

FIG. 4 is a schematic configuration diagram of an insulating oil-filled transformer according to Embodiment 3 of the present invention.

FIG. 5 is a schematic configuration diagram showing another modified example of the insulating oil-immersed transformer in Embodiment 3 of the present invention.

FIG. 6 is a schematic configuration diagram of an insulating oil-filled transformer according to Embodiment 4 of the present invention.

FIG. 7 is a schematic view of a configuration of a conventional insulating oil-immersed transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 16 Transformer case 2 Transformer main body 3 Transformer insulating oil 4 Heat collector 5 Heat pipe 6 Flat plate 7, 11 Heat radiator 8, 13, 18 Cooling unit 9 Cooling fan 10 Vent hole 12 Net plate 14 Vent duct 15 Fin 17 Step

Continuation of the front page (56) References JP-A-60-28213 (JP, A) JP-A-56-162810 (JP, A) JP-A-59-158507 (JP, A) JP-A-58-194317 (JP) JP-A-52-46435 (JP, A) JP-A-56-114523 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 27/08 H01F 27/18

Claims (12)

(57) [Claims] 1. Heat radiation consisting of a heat pipe and a plurality of flat plates
A cooling unit having a body and the heat collecting member, pairs the radiator
A cooling fan provided facing the cooling fan.
Ventilation holes are provided in the flat plate disposed near the center of the
A transformer. 2. The transformer according to claim 1 , wherein the flat plate has a net shape . 3. The opening area of the vent hole is 3 to 3 times the area of the heat radiator.
3. The transformer according to claim 1, wherein the voltage is 0%. 4. A cooling unit is provided on the windward side of the cooling fan.
2. The transformer according to claim 1 , wherein the transformer is turned off . 5. A heat radiation comprising a heat pipe and a plurality of flat plates.
A cooling unit having a body and a heat collector;
A cooling fan for cooling the radiator and a transformer case
The air passing through the cooling fan
When a ventilation duct is installed on the outer surface of the case,
To the flat plate arranged near the center of the cooling fan.
A transformer having a ventilation hole . 6. A cooling fan is provided in a ventilation duct.
The transformer according to claim 5, characterized in that: 7. An outer surface of a transformer case into which air is introduced.
6. A radiating fin is formed on the fin.
The transformer as described. 8. An outer surface of a transformer case into which air is introduced.
In addition, a plate-shaped heat pipe is provided
The transformer of claim 5 . 9. Heat radiation comprising a heat pipe and a plurality of flat plates.
A cooling unit having a body and a heat collector;
Cooling fan, transformer body and electric
A transformer case containing an insulating fluid;
Is immersed in the electrically insulating fluid and the cooling fan is
Vent holes were provided in the flat plate located near the center of the fan
A transformer device characterized by that: 10. A heat collector is disposed above the transformer body.
10. The transformer according to claim 9, wherein: 11. A heat collector is arranged in parallel with the transformer body.
Transformer device of 請 Motomeko 9, wherein a was. 12. A radiator and a cooling fan are provided in a transformer case.
It is attached to the step formed on the upper surface of the
12. The transformer according to claim 11, wherein: