JP4732936B2 - Distribution transformer equipment - Google Patents

Description

  The present invention relates to a distribution transformer device that distributes power to consumers, and more particularly, to a distribution transformer device installed on the road, on the ground, or in a customer's building or site.

  Generally, as shown in Patent Document 1, for example, a distribution transformer device includes a transformer in which a transformer body is sealed in a transformer tank filled with an insulating medium, and the transformer penetrating through the transformer tank. A primary side bushing that connects a primary side conductor to the primary side of the main body, a secondary side bushing that passes through the transformer tank and connects a secondary side conductor to the secondary side of the transformer body, and the like are housed. And a distribution box.

JP 2004-39824 A

  According to the above-described conventional distribution transformer device, the transformer, the primary side bushing, and the secondary side bushing are arranged in the same space in the distribution box. In this way, the transformer, primary bushing, and secondary bushing are arranged in the same space in the distribution box, so let's cool the transformer by introducing outside air to reduce the size or increase the capacity. Then, moisture and dust contained in the outside air are introduced to the periphery of the primary side bushing and secondary side bushing that dislike moisture and dust, so that the dielectric strength of the primary side bushing and secondary side bushing is reduced. There is a fear.

  In addition, since the transformer, the primary side bushing, and the secondary side bushing are arranged in the same space, the primary side bushing and the secondary side bushing are easily heated by the heat generated during operation of the transformer. As a result, the temperature of the device connected to the primary side bushing and the secondary side bushing may be raised, and the function of the device may be deteriorated.

  An object of the present invention is to provide a distribution transformer device capable of suppressing the temperature rise of the primary side bushing and the secondary side bushing without reducing the dielectric strength and cooling the transformer.

  To achieve the above object, the present invention comprises a distribution box comprising a first storage chamber for storing a transformer, a second storage chamber for storing a primary side bushing and a secondary side bushing, and The first storage chamber is provided with an outside air inlet / outlet through which the outside air is led in and out, the second storage chamber has a sealed structure, and the primary side conductor connecting the primary side bushing to the transformer body and the secondary side bushing are transformed. The secondary conductor connected to the transformer main body is connected to the transformer main body from the lower part of the transformer tank of the transformer through the second storage chamber and the first storage chamber.

  In order to achieve the above object, the present invention comprises a distribution box comprising a first storage chamber for storing a transformer, and a second storage chamber for storing a primary side bushing and a secondary side bushing. The first storage chamber is provided with an outside air inlet / outlet for introducing and discharging the outside air, the second storage chamber has a sealed structure, and the primary side bushing and the secondary side conductor for connecting the primary side conductor to the transformer body And a secondary bushing connecting the main body to the transformer main body is installed in the lower part of the transformer tank so as to penetrate between the second storage chamber and the first storage chamber.

  As described above, according to the present invention, even when the transformer stored by introducing outside air into the first storage chamber is cooled, the outside air does not enter the second storage chamber, and as a result, The transformer can be cooled without causing a decrease in the dielectric strength due to the outside air of the primary side bushing and the secondary side bushing stored in the second storage chamber. Also, the primary side conductor that connects the primary side bushing to the transformer body and the secondary side conductor that connects the secondary side bushing to the transformer body, or the primary side bushing and the secondary side bushing are relatively low in the temperature of the insulating medium. Since it penetrates in the lower part of the low transformer tank, the temperature rise of the primary side bushing and the secondary side bushing due to the thermal influence from the transformer tank side can be kept to a minimum, so that the primary side bushing and It is possible to suppress a decrease in function due to the temperature rise of the device connected to the secondary bushing.

  Therefore, according to the present invention, it is possible to obtain a distribution transformer device capable of suppressing the temperature rise of the primary side bushing and the secondary side bushing without reducing the dielectric strength and cooling the transformer. .

  A first embodiment of a distribution transformer device according to the present invention will be described below with reference to FIGS.

  In the distribution transformer device 1, necessary equipment is housed in a distribution box 2. The distribution box 2 includes a square bottom plate 3, side plates 4A to 4C erected from adjacent three sides of the square bottom plate 3, a ceiling plate 5, and a door that opens and closes an opening left surrounded by these. 6A, 6B, these doors 6A, 6B are opened and the depth direction is divided into two, and the partition plate 7 which forms the 1st storage chamber 8 and the 2nd storage chamber 9, and the said 1st storage chamber 8 are opposed. The outside air inlet 10 which is one of the outside air outlets formed in the side plates 4A to 4C and the ceiling plate 5 facing the first storage chamber 8 and / or the outside air outlets formed in the side plates 4A to 4C. One outside air outlets 11A to 11D are provided.

  A transformer 12 is accommodated in the first storage chamber 8. The transformer 12 is provided with a winding mounted on an iron core and accommodates the transformer main bodies TU, TV, TW arranged in the direction along the doors 6A, 6B, and the transformer main bodies TU, TV, TW. The transformer tank 12T is filled with a medium, for example, an insulating oil. The transformer tank 12T has a large number of cooling fins 13 mounted on the tank side wall facing the side plates 4A to 4C along the vertical direction. Yes. A cooling space G is formed between the side wall 12W of the transformer tank 12T facing the second storage chamber 9 and the partition plate 7, and the cooling space G of the ceiling plate 5 is formed. Outside air outlets 11 </ b> A to 11 </ b> D are opened at positions facing the cooling fins 13.

  On the other hand, the second storage chamber 9 has a sealed structure so that rainwater and dust do not enter, and a primary side switch 14 and its operation mechanism are disposed above one side in the width direction. A primary cable 15 constituting a primary conductor and an upper fuse connecting bushing 16A and a primary fuse 16 connected to a lower fuse connecting bushing 16B serving as a primary bushing are arranged side by side below. The primary side cable 15 -the primary side switch 14 -the upper fuse connection bushing 16A -the primary side fuse 16 -the lower fuse connection bushing 16B are connected in this order. The upper fuse connection bushing 16A, the primary fuse 16 and the lower fuse connection bushing 16B are housed in a fuse tank 17, and the lower end of the fuse tank 17 is connected to the transformer via a primary conductor through portion 18. It communicates with the lower part of the side wall 12W of the tank 12T. Accordingly, the fuse tank 17 and the primary conductor through-hole 18 are also filled with the insulating medium filled in the transformer tank 12T. Although not shown, the primary side conductor connected to the lower fuse connection bushing 16B passes through the primary side conductor penetration 18 and the primary side of the transformer bodies TU, TV, TW in the transformer tank 12T. It is connected to the.

  Further, a secondary side bushing 19 is disposed on the other side in the width direction of the second storage chamber 9, and the load side of the secondary side bushing 19 passes through the main circuit current breaker 20. The secondary side cable 20L constituting the secondary side conductor is connected. The secondary bushing 19 is installed on one surface of the bushing tank 21, and the lower end of the bushing tank 21 is connected to the side wall 12 </ b> W of the transformer tank 12 </ b> T via the secondary conductor through portion 22. It communicates with the lower part. Therefore, the bushing tank 21 and the secondary conductor through-hole 22 are also filled with the insulating medium filled in the transformer tank 12T. And although illustration is abbreviate | omitted, the secondary side conductor connected to the secondary side bushing 19 penetrates the secondary side conductor penetration part 22, and of transformer main body TU, TV, TW in the transformer tank 12T. Connected to the secondary side.

  Thus, since the primary side conductor penetrating portion 18 through which the primary side conductor penetrates and the secondary side conductor penetrating portion 22 through which the secondary side conductor penetrates are filled with the insulating medium, the primary side conductor and the secondary side conductor are filled. Sufficient insulation between the conductor and the insulation between the phases can be ensured.

  Further, a control communication device 23 is disposed between the fuse tank 17 and the bushing tank 21 in the second storage chamber 9, and another control communication device 24 is disposed above the control communication device 23.

  Meanwhile, air vent plugs 17B and 21B are provided at the tops of the fuse tank 17 and the bushing tank 21 for venting air mixed when the insulating medium is filled.

  In the distribution transformer device 1 configured as described above, the transformer 12 can be cooled by the outside air introduced from the outside air inlet 10 as the transformer 12 is heated. That is, natural convection is generated in which the air heated by the temperature rise of the transformer 12 moves above the first storage chamber 8 and is discharged to the outside from the outside air outlets 11A to 11D. As a result, fresh outside air is introduced into the first storage chamber 8 from the outside air introduction port 10 and flows upward along the cooling fins 13 provided on the tank side wall of the transformer tank 12T, and the side wall 12W and the partition plate. 7 flows upward in a cooling space G formed between the two. At that time, heat is removed from the cooling fins 13 and the side walls 12W, and the internal insulating medium is cooled to cool the transformer 12 and suppress the temperature rise.

  By introducing and cooling the outside air in this way, moisture and dust contained in the outside air are naturally introduced into the first storage chamber 8, but the introduced moisture and dust are directly supplied from the outside air outlets 11A to 11D. It is discharged to the outside or accumulates on the bottom plate 3. The water accumulated in the bottom plate 3 evaporates and disappears due to the heat generated during operation of the transformer 12, and the accumulated dust can be removed by regular cleaning. Therefore, moisture and dust contained in the outside air introduced to cool the transformer 12 do not enter the second storage chamber 9 from the first storage chamber 8, and therefore the second storage chamber 9. The insulation strength of the secondary side bushing 19 exposed inside and the upper fuse connection bushing 16A and the lower fuse connection bushing 16B installed in the fuse tank 17 is not lowered by moisture, dust, or the like. In addition, since the cooling space G is located on the second storage chamber 9 side in the first storage chamber 8, it is possible to prevent the heat from the transformer 12 from being transmitted to the second storage chamber 9. it can.

  On the other hand, by cooling the transformer 12 in this way, the temperature distribution in the height direction of the transformer 12 is lower at the lower part and higher at the upper part. Since the fuse tank 17 and the bushing tank 21 communicate with the lower part of the transformer tank 12T having a low temperature distribution, the temperature of the internal insulating medium is kept as low as the temperature of the lower part of the transformer tank 12T. be able to. As a result, the temperature rise of the upper fuse connection bushing 16A, the lower fuse connection bushing 16B, the primary side fuse 16 and the secondary side bushing 19 housed and attached in the fuse tank 17 and the bushing tank 21 can be suppressed. Accordingly, it is possible to prevent the deterioration of the function due to the temperature rise of the primary side switch 14 and the main circuit current breaker 20 which are devices connected to the upper fuse connection bushing 16A, the lower fuse connection bushing 16B, and the secondary side bushing 19, so that power distribution is possible. The reliability of the transformer device 1 can be increased.

  Next, a second embodiment of the distribution transformer device according to the present invention will be described with reference to FIG. Since the basic configuration is the same as that of the first embodiment shown in FIGS. 1 to 5, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  The second embodiment is different from the first embodiment in that a partition plate made of an insulator such as a press board or an aramid board is provided in the primary conductor through-hole 18 between the fuse tank 17 and the transformer tank 12T. 25A and 25B are provided.

  By providing such insulating partition plates 25A and 25B in the primary conductor through-hole 18, it is possible to prevent the heated insulating medium in the transformer tank 12T from flowing into the fuse tank 17, As a result, the temperature rise of the upper fuse connection bushing 16A and the lower fuse connection bushing 16B can be suppressed, and further, the temperature rise of components in the vicinity thereof can be suppressed.

  By the way, although two insulating partition plates 25A and 25B are provided, the number of installed partitions may be one or three or more, and may be appropriately selected in relation to the plate thickness.

  FIG. 6 illustrates the primary side conductor through portion 18 between the fuse tank 17 and the transformer tank 12T as an example, but naturally the secondary side conductor between the bushing tank 21 and the transformer tank 12T. By providing a similar insulating partition plate in the penetrating portion 22 as well, the temperature rise of the secondary bushing 19 can be similarly suppressed.

  FIG. 7 shows a first modification obtained by modifying FIG. 3, and the same reference numerals as those in FIG. 3 denote the same members, and therefore detailed description thereof is omitted.

  7 is different from FIG. 3 in that the upper portions of the fuse tank 17 and the bushing tank 21 are communicated with the side wall 12W of the transformer tank 12T via the communication passages 26 and 27, and the air vent plugs 17B and 21B in FIG. It was removed.

  With this configuration, when the insulating medium is filled in the transformer tank 12T, the insulating medium filling the fuse tank 17 and the bushing tank 21 overflows to the transformer tank 12T side. If the air vent plugs 17B and 21B are forgotten to be opened, the inconvenience that air remains in the upper portions of the fuse tank 17 and the bushing tank 21 can be solved.

  In the first and second embodiments and the first modification described above, the first storage chamber 8 and the second storage chamber 9 are partitioned by the partition plate 7, but the first embodiment shown in FIG. The first storage chamber 8 and the second storage chamber 9 may be partitioned by configuring as in the third embodiment.

  In FIG. 8, since the same members as those in FIG. 2 are denoted by the same reference numerals, detailed description thereof will be omitted.

  8 differs from the configuration of FIG. 3 in that partition plates 28A and 28B are provided between the side wall 12W of the transformer tank 12T facing the second storage chamber 9 and the side plates 4A and 4C of the distribution box 2. Although provided, a partition plate connected to the partition plates 28A and 28B is also provided between the side wall 12W of the transformer tank 12T and the ceiling plate 5 and the bottom plate 3 of the distribution box 2 positioned above and below the transformer tank 12T, The first storage chamber 8 and the second storage chamber 9 are completely partitioned.

  With this configuration, in the first embodiment and the first modification, the primary-side conductor penetrating portion 18, the secondary-side conductor penetrating portion 22, and the communication paths 26 and 27 are communicated with the transformer tank 12T. For this reason, there is no need to perform the process of penetrating the partition plate 7, which has the effect of reducing the number of processing steps.

  In the third embodiment shown in FIG. 8, the configuration in which the partition plates 28A and 28B and the partition plates connected thereto are provided around the side wall 12W of the transformer tank 12T has been described. However, without being limited to this configuration, for example, these partition plates surround the tank top surface, the tank bottom surface, and the tank side wall provided with the cooling fins 13 at positions slightly shifted from the side wall 12W side of the transformer tank 12T to the tank center side. The first storage chamber 8 and the second storage chamber 9 may be partitioned by closing the gap between the floor plate 3, 4 </ b> A, 4 </ b> C and the ceiling plate 5 of the distribution box 2.

  FIG. 9 shows a fourth embodiment of a distribution transformer device according to the present invention. The same reference numerals as those in FIG. 1 denote the same members, and thus detailed description thereof is omitted.

  9 differs from FIG. 1 in that an airborne primary side fuse that does not have a fuse tank 17 that accommodates the primary side fuse 16 is used, and for this reason, a primary side fuse is formed below the side wall 12W of the transformer tank 12T. The primary side bushing 30 which penetrates the primary side conductor 29 from 16 is provided.

  Of course, it is possible to eliminate the bushing tank 21 on the secondary side, and to provide the secondary side bushing 19 that allows the secondary side conductor from the main circuit current breaker 20 to pass through the lower portion of the side wall 12W of the transformer tank 12T. is there.

  Also with the above configuration, the same effects as those of the respective embodiments and modifications can be obtained.

1 is a perspective view showing a first embodiment of a distribution transformer device according to the present invention. FIG. The top view of FIG. The perspective view which shows the principal part of FIG. FIG. 4 is a partially longitudinal perspective view showing the vicinity of the fuse tank of FIG. 3. The perspective view which shows the external appearance of the distribution box of FIG. FIG. 5 is a view corresponding to FIG. 4 showing a second embodiment of a distribution transformer device according to the present invention. FIG. 3 is a view corresponding to FIG. 3 showing a first modification of the distribution transformer device according to the present invention. FIG. 2 is a view corresponding to FIG. 2 showing a third embodiment of a distribution transformer device according to the present invention. The equivalent diagram of FIG. 1 which shows 4th Embodiment of the transformer apparatus for power distribution by this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Distribution transformer apparatus, 2 ... Distribution box, 3 ... Bottom plate, 4A-4C ... Side plate, 5 ... Ceiling plate, 6A, 6B ... Door, 7, 28A, 28B ... Partition plate, 8 ... 1st storage chamber , 9 ... Second storage chamber, 10 ... Outside air inlet, 11 (11A to 11D) ... Outside air outlet, 12 ... Transformer, 12T ... Transformer tank, 13 ... Cooling fins, 14 ... Primary switch, 15 ... Primary side cable, 16 ... Primary side fuse, 16A ... Upper fuse connection bushing, 16B ... Lower fuse connection bushing (primary side bushing), 17 ... Fuse tank, 17B ... Air vent plug, 18 ... Primary side conductor penetration, 19 ... Secondary side bushing, 20 ... main circuit current breaker, 21 ... bushing tank, 21B ... air vent plug, 22 ... secondary side conductor penetration, 25A, 25B ... insulating partition plate, 26, 27 ... communication path, 29 ... Primary side conductor, 0 ... the primary side bushing.

Claims (4)

A transformer in which a transformer body is enclosed in a transformer tank filled with an insulating medium, a primary side bushing that passes through the transformer tank and connects a primary side conductor to a primary side of the transformer body, and the transformer In a distribution transformer device comprising a secondary side bushing that penetrates a transformer tank and connects a secondary side conductor to the secondary side of the transformer body, and a distribution box that houses these, the distribution box is: accommodating a first housing chamber and the primary bushing及beauty secondary bushing for accommodating a transformer partitioned by a partition plate or the primary-side bushing及beauty secondary bushing and facing a second It is composed of a housing chamber, wherein with the first storage room is closed to external air outlet inlet to guide and out the outside air, between the first of the transformer tank, which is housed in the housing chamber and the partition plate A cooling space is formed in The ceiling plate of said switch box facing the cooling space is open the external air outlet port, and said second housing chamber has a sealing structure, also, the secondary and the primary bushing The side bushing is connected to the transformer main body from the lower part of the transformer tank so as to penetrate between the second storage chamber and the first storage chamber. . A transformer in which a transformer body is enclosed in a transformer tank filled with an insulating medium, a primary side bushing that passes through the transformer tank and connects a primary side conductor to a primary side of the transformer body, and the transformer In a distribution transformer device comprising a secondary side bushing that penetrates a transformer tank and connects a secondary side conductor to the secondary side of the transformer body, and a distribution box that houses these, the distribution box is: accommodating a first housing chamber and the primary bushing及beauty secondary bushing for accommodating a transformer partitioned by a partition plate or the primary-side bushing及beauty secondary bushing and facing a second It is composed of a housing chamber, wherein with the first storage room is closed to external air outlet inlet to guide and out the outside air, between the first of the transformer tank, which is housed in the housing chamber and the partition plate A cooling space is formed in This is the power distribution box ceiling plate facing the cooling space is open the external air outlet port, the second housing chamber has a sealing structure, also, the primary conductor through the insulating medium is filled And a secondary-side conductor penetration portion are formed so as to penetrate between the second storage chamber and the first storage chamber, and a primary-side conductor penetration portion and a secondary-side conductor penetration portion are formed in the transformer. Power distribution characterized in that the primary side bushing and the secondary side bushing are installed on the second storage chamber side of the primary side conductor penetration part and the secondary side conductor penetration part connected to the lower part of the tank Transformer device. A transformer in which a transformer body is enclosed in a transformer tank filled with an insulating medium, a primary side bushing that passes through the transformer tank and connects a primary side conductor to a primary side of the transformer body, and the transformer In a distribution transformer device comprising a secondary side bushing that penetrates a transformer tank and connects a secondary side conductor to the secondary side of the transformer body, and a distribution box that houses these, the distribution box is: accommodating a first housing chamber and the primary bushing及beauty secondary bushing for accommodating a transformer partitioned by a partition plate or the primary-side bushing及beauty secondary bushing and facing a second It is composed of a housing chamber, wherein with the first storage room is closed to external air outlet inlet to guide and out the outside air, between the first of the transformer tank, which is housed in the housing chamber and the partition plate A cooling space is formed in This is the power distribution box ceiling plate facing the cooling space is open the external air outlet port, the second housing chamber has a sealing structure, also, the primary conductor through the insulating medium is filled And a secondary-side conductor penetration portion are formed so as to penetrate between the second storage chamber and the first storage chamber, and a primary-side conductor penetration portion and a secondary-side conductor penetration portion are formed in the transformer. A fuse tank and a bushing tank are connected to the lower part of the tank, and the primary-side conductor penetrating portion and the secondary-side conductor penetrating portion are filled with an insulating medium, respectively, and the fuse tank and the bushing tank are respectively connected A transformer device for distribution, wherein the primary bushing and the secondary bushing are installed.   The fuse tank and the bushing tank are formed to be long in the vertical direction, and lower portions thereof are communicated with the primary side conductor penetration portion and the secondary side conductor penetration portion, respectively, and an upper portion is connected to the primary side conductor penetration portion. 4. The distribution transformer device according to claim 3, wherein the transformer tank device is in communication with the transformer tank at a position above the secondary conductor through portion.

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