JP6214888B2 - Transformer - Google Patents

Description

  The present invention is intended to reduce noise in a transformer in which an iron core and a winding are disposed in insulating oil of a transformer tank.

  As a prior art related to the present invention, for example, as shown in FIG. 1 of Patent Document 1, the periphery of the iron core 2 and the winding 4 is covered with a bag body B1 made of a film member M1. With such a configuration, it is possible to reduce vibration transmission of noise propagating mainly in the liquid emitted from the iron core 2, and to realize low noise of the transformer.

JP 2008-226933 A

  In the configuration of FIG. 1 of Patent Document 1, since the periphery of the iron core 2 and the winding 4 is covered with the bag body B1 made of the membrane member M1, noise can be reduced, but convection of insulating oil due to heat is caused by these bags. Blocked by body B1. For this reason, cooling efficiency deteriorates, and the temperature of the iron core 2, the winding 4 and the insulating oil C rises. As a result, the deterioration rate of the insulator and insulating oil is increased. For example, increasing the amount of iron core and windings can reduce the amount of heat generation and solve these problems, but it is a heavy burden in terms of cost.

  An object of the present invention is to provide a transformer that can improve convection and reduce noise without disturbing convection of insulating oil as in the prior art.

In order to achieve the above object, the invention of claim 1
A transformer tank composed of a bottom part and a side plate part;
A transformer body provided in the interior of this transformer tank, and composed of an iron core and windings;
A liquid layer composed of an insulating liquid for cooling the transformer body ;
It has an internal discharge port for discharging the bubbles of the inert gas in the transformer tank, moving the liquid layer portion to the upper portion between the inner wall of the transformer body and the transformer tank by buoyancy of the bubble Gas discharge means ;
A radiator is provided on the side plate of the transformer tank,
The radiator is
An inflow pipe which is provided on the upper side of the side plate portion and into which the insulating liquid heated by the transformer body flows into the radiator;
An insulating pipe provided on the lower side of the side plate portion and cooled by the radiator to flow out to the transformer tank; and
The outlet is provided near the outlet of the insulating liquid in the outlet pipe;
The transformer is characterized in that a mesh-like capture box is provided above the discharge port .

The invention of claim 2, wherein the inert gas is a transformer according to claim 1, characterized in that the nitrogen gas or SF6 gas.

  According to the present invention, the cooling efficiency is improved by improving the convection of the insulating oil, and furthermore, noise can be reduced by the bubbles around the transformer body.

The front sectional view of the transformer in a 1st embodiment of the present invention is shown. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. The illustration of noise reduction by air bubbles is shown as a diagram. The front sectional view of the transformer in the 2nd embodiment of the present invention is shown. FIG. 5 is an enlarged perspective view of a portion surrounded by a broken-line circle in FIG. 4 (however, a diagram showing a transformer tank is omitted).

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  1 to 2, the transformer 1 includes a transformer tank 10, a transformer main body 30 provided inside the transformer tank 10, and a liquid layer portion 4 for cooling the transformer main body 30. Has been. The transformer tank 10 includes a side plate portion 11 and a bottom portion 12, and the transformer main body 30 includes an iron core 31 and a winding 32.

  The liquid layer portion 4 is made of insulating oil or the like that is an insulating liquid for cooling the transformer main body 30, and an air layer portion 5 is provided above the liquid layer portion 4.

  During operation in a state where it is installed indoors or the like, the iron core 31 of the transformer body 30 is excited, and noise generated at that time is propagated to the surroundings. In general, the greater the capacity of the transformer, the greater the noise value, which is transmitted to the surroundings as loud noise.

Further, when a load is connected to the transformer body 30, a load current flows through the winding 32 along with it, and heat due to load loss is generated. Since no-load loss has occurred in the iron core since it was applied, the heat generated in the transformer body 30 is cooled by the insulating oil in the liquid layer portion 4.

  When cooling with insulating oil, the insulating oil in the vicinity of the transformer body 30 warms and rises. If this insulating oil rises to the vicinity of the air layer portion 5 or to the vicinity of the side plate portion 11 at the top of the transformer tank 10, it is once cooled and then lowered along the vicinity of the inner wall of the side plate portion 11. Then, the insulating oil is again heated and raised near the transformer main body 30, so that convection of the insulating oil is generated in the liquid layer portion 4 in the transformer tank 10. Due to this convection, the transformer body 30 is radiated to the outside so as not to generate excessive heat.

  Here, the gas discharge means 20 will be described.

  The gas discharge means 20 includes an air pump 21, a gas injection pipe 22, a discharge port 23, a pipe 24, and a backflow prevention valve 25.

  The discharge port 23 is an inert gas blow-out port, and is disposed at the bottom 12 of the transformer tank 10. One end of the gas injection pipe 22 is connected, and the inert gas sent out from the gas injection pipe 22 is directed upward. And blow out.

  The gas injection pipe 22 is a pipe line arranged at the bottom 12 of the transformer tank 10, and one end is connected to the discharge port 23, and the other end is connected to the air pump 21 via the backflow prevention valve 25.

  The backflow prevention valve 25 is provided in the gas injection pipe 22 outside the transformer tank 10 so as to prevent the insulating oil in the transformer tank 10 from flowing back to the air pump 21.

  The air pump 21 is provided at a location different from the transformer tank 10 and is connected to the other end of the gas injection pipe 22. It is also a power source that sends inert gas to the discharge port 23 through the gas injection pipe 22. The air pump 21 is housed in the soundproof box 6 so as not to leak the operating sound when the inert gas is sent out.

  The pipe 24 is connected between the gas layer part 5 and the air pump 21, and serves as a path for the inert gas when the air pump 21 sucks the inert gas in the gas layer part 5 filled with the inert gas. Fulfill.

  Here, the arrangement of the outlet 23 and the gas injection pipe 22 at the bottom 12 will be described with reference to FIG.

  When the transformer 1 is viewed from the upper surface (in the direction of arrow J in FIG. 1), the discharge port 23 is located on the outer periphery of the transformer main body 30 (located at the outermost periphery when the transformer main body 30 is projected from the upper surface to the bottom). Four are provided between the inner wall of the side plate portion 11 of the transformer tank 10 so as to surround the transformer main body 30. Further, any of the discharge ports 23 is provided at a position closer to the outer periphery of the transformer body 30 than the inner wall of the side plate portion 11.

  Here, let the discharge port 23 be a first discharge port 23a, a second discharge port 23b, a third discharge port 23c, and a fourth discharge port 23d, respectively, clockwise from the bottom of FIG.

  As shown in FIG. 2, the gas injection pipe 22 penetrates the side plate 11 of the transformer tank 10 from the other end connected to the air pump 21, and is drawn out to the bottom portion 12. And one end is connected to each of the four outlets 23a to 23d.

  The first gas injection pipe 22a is an L-shaped pipe line having one end connected to the first discharge port 23a and the other end connected at a branch point B. Similarly, the third gas injection pipe 22c is an L-shaped pipe line having one end connected to the third discharge port 23c and the other end connected to the branch point B.

  The fourth gas injection pipe 22d is a straight pipe line, one end is connected to the fourth outlet 23d, and the other end is connected to the branch point B. Furthermore, the 2nd discharge port 23b is connected also to the branch point B vicinity of the other end.

  The movement (circulation) of the inert gas will be described with the above configuration.

  In FIG. 1, a cylinder in which an inert gas (not shown) is compressed and sealed is connected to an air pump 21, and the inert gas is supplied to a gas injection pipe 22 (and further, gas injection pipes 22 a to 22 d) by the power of the air pump 21. Through the first to fourth outlets 23a to 23d.

  Each discharge port 23a thru | or 23d discharges the inert gas sent out from the air pump 21 as the bubble 7 toward right above. At this time, since each of the discharge ports 23 a to 23 d is provided near the outer periphery of the transformer body 30, the bubbles 7 rise near the outer periphery of the transformer body 30 due to buoyancy. Conventionally, the insulating oil is viscous and the convection speed due to heat is slow, but the insulating oil near the outer periphery of the transformer body 30 is heated near the transformer body 30 due to the buoyancy of the bubbles 7 of the inert gas. It rises faster than before, increasing the convection speed. As a result, the heat of the transformer main body 30 is efficiently removed, and the heat dissipation efficiency is increased.

  Further, the inert gas discharged from each of the discharge ports 23a to 23d moves to the gas layer portion 5 as a bubble 7 by buoyancy. The gas layer portion 5 is filled with these inert gases. The inert gas is sucked by the air pump 21 through the pipe 24 and moves to the air pump 21.

  The sucked inert gas is again sent to the discharge port 23 by the power of the air pump 21 and, as a result, is circulated by the route described above.

  Here, it has been described that the convection can be improved by the bubbles 7, but noise can be reduced. This will be described with reference to FIG. In FIG. 3, the noise reduction by the bubbles 7 will be described using the sound wave C that does not pass through the bubble 7 and the sound wave D and sound wave F that pass through the bubble 7.

  First, the sound wave C that does not pass through the bubbles 7 (the arrow indicates the direction in which the sound wave travels) is attenuated when passing through the liquid layer portion 4 (insulating oil), but not so much.

However, the sound wave D passing through the bubble 7 is attenuated more than the sound wave C for the following reason. This is because when the sound wave D passes through the bubble 7 and reaches the liquid layer part 4, the sound wave D is reflected as a reflected sound wave E although it is slight due to the difference in reflectance between the bubble 7 and the liquid layer part 4. . Due to the reflected sound wave E, the sound wave D passing through the liquid layer portion 4 is slightly attenuated. The reflected sound wave E is again slightly reflected in the bubble part 7 again, and the sound wave reflected a plurality of times passes through the liquid layer part 4 each time, but even if they are added together, it is smaller than the sound wave C. In addition, although the sound waves are slightly consumed by energy such as heat by repeatedly reflecting within the bubbles 7, the bubbles 7 themselves serve to absorb sound, and as a result, the sound waves emitted from the transformer body 30. D is reduced from the sound wave C.

As for the sound wave F, since the bubble 7 has a spherical shape, when the sound wave F passes through the bubble 7 and reaches the liquid layer portion 4, reflection is performed at various angles within the bubble 7, and the reflected sound wave G is diffused. In the same manner as described above, the sound wave emitted from the transformer body 30 is reduced, for example, the bubble 7 itself slightly plays a role of sound absorption.

  As described above, the bubbles 7 can not only improve the convection of the insulating oil but also reduce noise.

In the present embodiment, four discharge ports 23 corresponding to the four sides of the transformer tank 10 are provided. However, by providing the discharge ports 23 on the entire circumference of the transformer body 30 in this way, the transformer tank 10 The convection can be improved evenly in the interior, and noise can be reduced in all directions.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same structure as what was demonstrated in 1st Embodiment is provided with the same number, and detailed description is omitted.

  In the second embodiment, a radiator 40 is attached to the side plate 11 of the transformer tank 10 as shown in FIG. The heat radiator 40 includes an inflow pipe 41, an outflow pipe 42, and a heat radiation portion 43. One end of the inflow pipe 41 is lower than the liquid surface of the liquid layer portion 4 and is connected to the upper side of the side plate portion 11, and the other end is connected to the heat radiating portion 43.

  One end of the outflow pipe 42 is connected to the lower side of the side plate portion 11, and the other end is connected to the heat radiating portion 43. With such a configuration of the radiator 40, the insulating oil warmed by the transformer body 30 rises, flows into the inflow pipe 41, moves to the heat radiating portion 43, is cooled by the heat radiating portion 43, and is cooled. The insulated oil flows into the lower part of the liquid layer in the transformer tank 10 through the outflow pipe 42, is warmed again by the transformer body 30, rises, and circulates.

  Further, as shown in FIG. 4, the trapping box 8 is attached to the inner wall of the side plate portion 11 at the upper part of the insulating oil outlet of the outflow pipe 42. The capture box 8 has a substantially rectangular parallelepiped shape formed in a mesh shape and extends to the top of the fourth discharge port 23d.

  The role of the capture box 8 will be described with reference to FIG. 5 shown as an enlarged perspective view of a portion surrounded by a broken-line circle in FIG. Although not shown, the lower surface of the capture box 8 facing the bottom 12 is opened. An arrow H indicates the flow of insulating oil.

In conventional transformers, there are no floating materials such as sludge and iron core fragments. For example, sludge is generated by a tap changer or the like that switches in oil, but since such a changer is provided in a separate chamber from the transformer tank 10, no sludge or the like is generated in the transformer tank 10.

  However, if the trap box 8 shown in the present embodiment is used, sludge can be collected efficiently even if a tap changer that generates sludge is arranged in the transformer tank 10. This is due to the convection of the insulating oil, and the sludge flowing out from the outflow pipe 42 of the radiator 40 flows out in the direction of arrow H together with the insulating oil. At this time, the sludge rises to the trapping box 8 due to the buoyancy of the bubbles 7, and the sludge can be efficiently collected in the trapping box 8. That is, conventionally, the tap changer has been provided in a separate chamber, but since sludge can be collected efficiently by the buoyancy of such bubbles 7, it can also be provided in the same transformer tank 10 without being provided in a separate chamber. Yes and economical.

  With the above-described configuration, not only can convection be improved and noise can be reduced, but also impurities and the like can be efficiently collected by the bubbles 7.

  In the present invention, four outlets 23 corresponding to the four sides in the transformer tank 10 are provided, but particularly in a direction to reduce noise (for example, a direction in which residents are present for indoor use). Further, a large number of discharge ports may be provided, or a function of adjusting the discharge amount of the inert gas may be provided.

  As the inert gas shown in the present invention, for example, a versatile nitrogen gas or a highly insulating SF6 gas is suitable.

DESCRIPTION OF SYMBOLS 1 Transformer 4 Liquid layer part 5 Air layer part 7 Air bubble 8 Capture box 10 Transformer tank 11 Side plate part 12 Bottom part 20 Gas discharge means 21 Air pump 22 Gas injection pipe 23 Outlet 24 Pipe 30 Transformer body 31 Iron core 32 Winding 40 Radiator 41 Inflow pipe 42 Outflow pipe

Claims (2)

A transformer tank composed of a bottom part and a side plate part;
A transformer body provided in the interior of this transformer tank, and composed of an iron core and windings;
A liquid layer composed of an insulating liquid for cooling the transformer body ;
It has an internal discharge port for discharging the bubbles of the inert gas in the transformer tank, moving the liquid layer portion to the upper portion between the inner wall of the transformer body and the transformer tank by buoyancy of the bubble Gas discharge means ;
A radiator is provided on the side plate of the transformer tank,
The radiator is
An inflow pipe which is provided on the upper side of the side plate portion and into which the insulating liquid heated by the transformer body flows into the radiator;
An insulating pipe provided on the lower side of the side plate portion and cooled by the radiator to flow out to the transformer tank; and
The outlet is provided near the outlet of the insulating liquid in the outlet pipe;
A transformer characterized in that a mesh-like capture box is provided above the discharge port . The transformer according to claim 1 , wherein the inert gas is nitrogen gas or SF6 gas.

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