JP2004039824A - On-road transformer equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide on-road transformer equipment capable of enlarging a transformer capacity without increasing its contour size. <P>SOLUTION: Primary bushings 5u-5w are attached to the lower part of one side plate of a transformer tank 2, and a secondary bushing is attached to the bottom plate. Heat radiators 7a, 7b and 7d are attached to the other three side plates 2a, 2b and 2d except for one side plate 2c attaching the primary bushings 5u-5w of the transformer tank 2, respectively. Insulating oil is filled so as to fill the inside of the transformer tank 2, and a diaphragm conservator arranged downward of the transformer tank 2 and the uppermost part of the transformer tank 2 are connected through a connection pipe. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a road-mounted transformer device.
[0002]
[Prior art]
2. Description of the Related Art In recent years, in urban areas, along with the underground distribution lines, transformer devices of a road installation type have been installed on sidewalks along roads and the like.
[0003]
As is well known, a road-mounted transformer device includes a transformer body together with insulating oil in, for example, a rectangular parallelepiped transformer tank to which a primary bushing and a secondary bushing are attached, and includes a primary terminal and a secondary terminal of the transformer body. A transformer having a configuration in which a secondary terminal is connected to a primary bushing and a secondary bushing respectively, an outer box containing the transformer, and one side plate of a transformer tank (for example, a left side plate when the tank is viewed from the front). And a primary-side accessory device including a switch and a fuse, which are arranged in a space in an outer box formed on the side of the switch.
[0004]
An underground groove is provided below the outer box, and a primary cable drawn into the outer box from underground is connected to a primary terminal of the transformer main body through a primary accessory and a primary bushing. A plurality of feeder branch conductors are connected to the secondary bushing of the transformer, and the secondary cables connected to the respective branch conductors are drawn out from the lower part of the outer box into the underground trench.
[0005]
In this type of conventional transformer device, the amount of insulating oil is set so that an air chamber is formed in the upper part of the transformer tank, and one side plate of the transformer tank corresponding to the air chamber is provided. The primary bushing was mounted on the upper part (in this example, the left side plate), and primary accessories such as switches and fuses were arranged below the primary bushing. A secondary bushing connected to a secondary terminal of the transformer body is attached to a portion corresponding to the air chamber on an upper portion of a side plate on a front side (a surface facing the front door of the outer box) of the transformer tank. A plurality of power supply branch conductors (conductors for connecting the secondary cable) connected to the secondary bushing are arranged on the front side of the transformer tank while being positioned below the secondary bushing, and are connected to the transformer. Supported against the tank.
[0006]
As described above, in the conventional road-mounted transformer device, the primary bushing is attached to one side plate (the left side plate in the above example) of the transformer tank, and the primary side accessory is arranged on the side. Since the secondary bushing was attached to the top of the front side plate and the power supply branch conductor was arranged, the left side plate and the front side plate of the transformer tank were used as mounting surfaces for the radiator that cools the insulating oil. Could not be used. Therefore, in this type of conventional transformer device, the radiator is attached only to the right side plate and the rear side plate of the transformer tank.
[0007]
[Problems to be solved by the invention]
2. Description of the Related Art In recent years, as the demand for electric power in urban areas increases, and in order to meet the need for cost reduction of facilities, it is required to increase the transformer capacity of road-mounted transformers.
[0008]
On the other hand, strict restrictions are imposed on the external dimensions of road-mounted transformers according to local government regulations, so it is necessary to increase the transformer capacity without increasing the external dimensions. However, in the structure of the conventional road-mounted transformer device, it has been difficult to increase the capacity without increasing the external dimensions.
[0009]
Also, in order to beautify the urban environment, it is preferable to make the on-street type transformer as small as possible. If it is not necessary to increase the capacity, it is desirable to reduce the overall external dimensions. However, in this type of conventional transformer, the capacity is increased to its structural limit, so that there is a limit in reducing the external dimensions as long as the conventional structure is adopted.
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to increase the capacity of a transformer without increasing the external dimensions, and to reduce the external dimensions when the capacity is the same as the conventional type. An object of the present invention is to provide a transformer device.
[0011]
[Means for Solving the Problems]
The present invention has a rectangular parallelepiped transformer tank to which a primary bushing and a secondary bushing are attached, and a transformer body housed in the transformer tank together with insulating oil, and includes a primary terminal and a secondary terminal of the transformer body. A transformer whose side terminals are electrically connected to the primary bushing and the secondary bushing, respectively, and an outer box accommodating the transformer are provided, and a primary cable drawn into the outer box from underground is electrically connected to the primary bushing. And a secondary cable electrically connected to the secondary bushing is drawn out from the lower part of the outer box to the underground.
[0012]
In the present invention, the transformer tank is arranged in the outer box with the equipment accommodating space secured below the bottom plate, and the primary bushing is attached to one side plate of the transformer tank. Further, a radiator for cooling the insulating oil is attached to the other three side plates of the transformer tank except for the one side plate by filling the transformer tank with the insulating oil completely. Further, a conservator for absorbing the expansion and contraction of the insulating oil in the transformer tank is arranged in the equipment housing space, and the upper part in the transformer tank and the conservator are connected through a connection pipe.
[0013]
As described above, eliminating the air chamber previously formed in the upper part of the transformer tank and using a structure in which the inside of the transformer tank is filled with insulating oil reduces the height of the transformer tank by the amount of air pressure lost. Even if the transformer is reduced, it is possible to secure a volume required to accommodate the transformer main body in the transformer tank.
[0014]
Also, as described above, a conservator for absorbing the expansion and contraction of the insulating oil in the transformer tank is provided, and the conservator is connected to the transformer tank. When the temperature of the transformer rises, the internal pressure of the transformer tank is increased. Does not rise, it is not necessary to increase the mechanical strength of the transformer tank in preparation for an increase in the internal pressure, and the transformer tank can be downsized.
[0015]
Therefore, even if the height dimension of the transformer tank is reduced to secure the equipment accommodation space below the transformer tank, the volume required for accommodating the transformer main body in the transformer tank is secured. be able to.
[0016]
In addition, as described above, when the radiators are attached to the other three side plates except the one side plate of the transformer tank, respectively, the cooling efficiency of the insulating oil is increased, and the temperature rise of the transformer body is suppressed. Therefore, even if the amount of heat generated from the transformer main body is increased, the temperature of the transformer can be kept within an allowable range.
[0017]
As a result, it is possible to operate the transformer in a state in which the amount of heat generated from the transformer body is larger than before.If the transformer capacity can be equivalent to that of the conventional case, the transformer body can be downsized and the transformer The size of the vessel can be reduced. Further, when the size of the transformer main body is made equal to that of the conventional case, it is possible to increase the capacity of the transformer while keeping the size of the outer box within the constraints.
[0018]
The conservator includes a container, and a deformable diaphragm (comprising a rubber film or the like) provided to partition the inside of the container into an oil chamber and an air chamber, and the oil chamber is connected via a connection pipe. A known diaphragm type conservator connected to the upper part of the transformer tank and having an air chamber communicated with the outside air can be used.
[0019]
In a preferred aspect of the present invention, the radiator is attached to the other three side plates except the one side plate of the transformer tank and the ceiling plate, respectively. With this configuration, the cooling efficiency of the insulating oil can be further increased.
[0020]
The secondary bushing can be attached to, for example, a lower part of a side plate other than the one side plate of the transformer tank (preferably, a front side plate of the transformer tank), but the secondary bushing is preferably attached to a bottom plate. Is preferred.
[0021]
As described above, if the secondary bushing is mounted on the bottom plate of the transformer tank, there is no need to secure a mounting space for the secondary bushing on the side plate of the transformer tank. There is no limitation on the size of the radiator attached to the radiator. Therefore, each radiator can be attached by effectively utilizing the space of the entire side plate of the transformer tank, and the cooling performance of the insulating oil can be improved.
[0022]
When the secondary bushing is attached to the bottom plate of the transformer tank as described above, only the radiator smaller in depth than the secondary bushing needs to be attached to the front side plate of the transformer tank. The depth dimension of the transformer tank can be increased without increasing the depth dimension.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. FIGS. 1 to 4 show an example of the construction of a road-mounted transformer according to the present invention. FIG. 1 is a front view showing the internal structure of the outer box with the front plate removed, and FIG. FIG. 3 is a plan view showing the internal structure of the outer box with the ceiling plate removed, FIG. 3 is a side view showing the internal structure of the outer box with the right side plate removed, and FIG. 4 is a bottom view. 1 to 3, a part of the radiator attached to the transformer tank is not shown for convenience.
[0024]
1 to 4, reference numeral 1 denotes an outer box formed in a rectangular parallelepiped shape by a base frame 1A made of a shaped steel material, a front plate 1a and a back plate 1b, left and right side plates 1c and 1d, and a ceiling plate 1e. Thus, the front plate 1a can be removed.
[0025]
Reference numeral 2 denotes a transformer tank disposed in the outer box 1 and supported on a base frame 1A via a gantry 3. The transformer tank includes a front side plate 2a and a rear side plate 2b, and left and right sides. Are formed in a rectangular parallelepiped shape by the side plates 2c and 2d, the ceiling plate 2e, and the bottom plate 2f.
[0026]
In the present specification, one of the four side plates 2a to 2d of the transformer tank 2 and the other of the two side plates along the long side of the rectangular bottom plate 2f of the transformer tank are respectively referred to as a front side plate 2a and a rear surface. Side plate 2b. The transformer tank 2 is disposed in the outer case 1 with its front side plate 2a facing the front plate 1a of the outer case 1.
[0027]
The transformer tank 2 is arranged in a state of being shifted to one end side in the width direction of the outer box 1 (the right side plate 1d side in the illustrated example), and one side plate of the transformer tank 2 (in the illustrated example, The space in the outer box formed on the side of the left side plate) is used as a primary device accommodation space 4A in which primary accessories such as fuses and switches are arranged. In the illustrated example, the space below the bottom surface of the transformer tank 2 is used as a device accommodation space 4B for accommodating accessory devices, conservators, and the like on the secondary side.
[0028]
The left side plate 2c and the bottom plate 2f of the transformer tank 2 are made of a flat steel plate, and three-phase primary bushings 5u to 5w are attached to the lower part of the side plate 2c side by side in the depth direction of the transformer tank. , Two secondary bushings 6u1, 6v1, 6w1, 6n1 provided respectively for the three-phase secondary terminal on the non-neutral point side and the secondary terminal on the neutral point side of the transformer main body. , 6u2, 6v2, 6w2 and 6n2 are mounted side by side in the width direction of the transformer tank (see FIG. 4). Among these secondary bushes, those with subscripts u, v and w (6u1, 6v1, 6w1, 6u2, 6v2 and 6w2) are the secondary terminals on the non-neutral point side of the U, V and W3 phases. , A subscript (6n1, 6n2) indicates a secondary bushing provided for the secondary terminal on the neutral point side.
[0029]
As can be seen in FIG. 1, each primary bushing is oil-tightly penetrated through the insulator tube 5a and the insulator tube 5a which is attached in a state where the attachment hole provided in the lower part of the side plate 2c of the transformer tank is oil-tightly penetrated. And a center conductor 5b. In addition, as shown in FIG. 3, each secondary bushing is provided with an insulator tube 6a attached in a state where the attachment hole provided in the bottom plate 2f of the transformer tank is oil-tightly penetrated, and an insulator tube 6a is penetrated in an oil-tight manner. And a center conductor 6b.
[0030]
In the present invention, radiators 7a, 7b and 7d are attached to at least three side plates 2a, 2b and 2d other than one side plate 2c of the transformer tank 2, respectively. In the illustrated example, the steel plates constituting the front side plate 2a, the rear side plate 2b, and the right side plate 2d of the transformer tank are corrugated to form a front side plate 2a, a rear side plate 2b. A large number of hollow radiating fins 2a1, 2b1 and 2d1 are formed on the right side plate 2d, respectively, and these radiating fins constitute radiators 7a, 7b and 7d, respectively.
[0031]
Further, in the present embodiment, the ceiling plate 2e of the transformer tank 2 is made of a steel plate that has not been subjected to corrugation, and a metal having good heat conductivity is formed on the upper surface of the ceiling plate 2e with a U-shaped cross section. Are attached by welding, and a radiator 7e is constituted by these fins 2e1, 2e1,....
[0032]
A conservator 8 is arranged in the equipment housing space 4B below the bottom plate 2f of the transformer tank 2, and a connection pipe 9 made of a material such as copper is provided between the top of the transformer tank 2 and the conservator 8 by a connecting pipe 9. It is connected. As shown in FIG. 3, the illustrated conservator 8 includes a container 801 and a deformable diaphragm (made of a rubber film or the like) 804 provided to partition the inside of the container into an oil chamber 802 and an air chamber 803. The oil chamber 802 is connected to the upper part of the transformer tank through the connection pipe 9, and the air chamber 803 is communicated with the outside air. The connection pipe 9 is provided between the radiator fins 2 b 1 of the radiator provided on the side plate on the rear side of the transformer tank 2, and one end of the connection pipe 9 passes through a hole provided on the ceiling plate 2 e of the transformer tank 2. 2 is connected to the uppermost part. The other end of the connection pipe 9 is connected to an oil chamber 802 of the conservator 8.
[0033]
The transformer main body 11 is accommodated in the transformer tank 2. The illustrated transformer main body 11 includes a three-leg iron core 12 in which upper and lower yoke portions are fastened by yoke fasteners 12A and 12B, and a three-phase winding 13u wound around three legs of the iron core 12, respectively. This transformer main body has a well-known configuration having a lower yoke fastening fixture 12B fixed to a bottom plate 2f of the transformer tank 2 and a transformer yoke. Fixed to 2.
[0034]
The three-phase primary windings of the transformer main body 11 are Δ-connected, and the three-phase terminals (primary side terminals of the transformer main body) of the primary windings are connected to the centers of the primary bushings 5u to 5w in the transformer tank 2. It is connected to one end of the conductor 5b.
[0035]
The three-phase secondary winding of the transformer main body 11 is star-connected, and the secondary side of the transformer main body drawn from the neutral point terminal and the three-phase non-neutral point side terminal of the secondary winding, respectively. The terminals are each connected to the center conductor of a corresponding secondary bushing mounted on the bottom plate 2f of the transformer tank.
[0036]
As described above, in the present embodiment, the two secondary bushings 6n1 and 6n2 are provided for the neutral point of the secondary winding, and the U, V, and W3 phase non-neutral points of the transformer main body are provided. Are provided with two secondary bushings (6u1, 6u2), (6v1, 6v2) and (6w1, 6w2), respectively, for a total of eight secondary bushings 6u1, 6v1, 6w1. , 6n1, 6u2, 6v2, 6w2, and 6n2 are arranged in a line at equal intervals in the width direction of the transformer tank 2 (a direction perpendicular to the plane of FIG. 3 and a horizontal direction of FIG. 1). Installed. The secondary terminal on the neutral point side of the secondary winding of the transformer main body 11 and the secondary terminal on the non-neutral point side of the three phases are connected to two corresponding secondary bushings in the transformer tank 2. It is connected to the center conductor 6b through a connection conductor (not shown).
[0037]
A lubrication port 201 which is normally closed by a stopper is provided on the ceiling plate 2 e of the transformer tank 2, and insulating oil is injected from the lubrication port 201 into the transformer tank 2 and the oil chamber 802 of the conservator 8. You. In the present invention, the inside of the transformer tank 2, the inside of the connection pipe 9, and the oil chamber 802 of the conservator 8 (see FIG. 3) so that an air chamber is not formed in the upper part of the transformer tank 2. The insulating oil is filled so as to completely fill the inside. As the insulating oil, it is desirable to use silicon oil or mineral oil having high heat resistance.
[0038]
A transformer 15 is constituted by the transformer tank 2 and a transformer main body 11 housed therein together with insulating oil.
[0039]
Three-phase fuse cylinders 16u to 16w configured to receive the respective center conductors of the three-phase primary bushings 5u to 5w are connected to the lower portion of the left side of the transformer tank 2 facing the primary-side equipment housing space 4A. Have been. A hole for receiving the center conductor 5b of the primary bushings 5u to 5w is formed in a peripheral wall portion near the lower end of each of these fuse cylinders, and a flange portion 16a is formed around the hole. The three-phase fuse cylinders 16u to 16w are arranged with their respective axes oriented in the vertical direction, and the respective flange portions 16a are oil-tightly connected to the insulator tubes 5a of the corresponding primary bushings 5u to 5w. . That is, in the illustrated example, the three-phase fuse cylinders 16u to 16w are connected to the lower part of one side of the transformer tank 2 via the insulator tubes 5a of the three-phase primary bushings 5u to 5w, and the three-phase primary bushings are connected to each other. The center conductor 5b is introduced into the fuse cylinders 16u to 16w.
[0040]
The fuse 17 contains a fuse conductor in a cylindrical case 17a, and electrodes 17b and 17c connected to one end and the other end of the fuse conductor are attached to a lower end and an upper end of the case 17a, respectively. The lower electrodes 17b of the fuses 17 arranged in the fuse cylinders 16u to 16w are connected to the respective center conductors 5b of the primary bushings 5u to 5w in the fuse cylinders 16u to 16w, and are connected to the upper electrodes of the three-phase fuses. 17c is connected to a terminal conductor (not shown) which extends upward through an end wall closing the upper end of each of the fuse cylinders 16u to 16w.
[0041]
The switch 18 includes switches 18 </ b> Au to 18 </ b> Aw respectively configuring three-phase breaking parts for the first circuit and switches 18 </ b> Bu to 18 </ b> Bw configuring three-phase breaking parts for the second circuit in the outer case 1. The upper end of the three-phase fuse cylinder 16 is inserted into the case 18C. One terminal of each of the three-phase switches 18Au to 18Aw and 18Bu to 18Bw is connected to a terminal conductor connected to the upper electrode 17c of the three-phase fuse 17 through a connection conductor 18D, and the switches 18Au to 18Aw and 18Bu of each phase are connected. 18Bw are connected to terminals of a cable connector (not shown) attached to a lower end of the case 18C.
[0042]
In the primary-side equipment housing space 4A, the three-phase primary cables 21Au to 21Aw of the first circuit and the three-phase primary cables 21Bu to 21Bw of the second circuit are set up from the underground ditch. Terminal portions are connected to cable connectors connected to the other ends of the switches 18Au to 18Aw and 18Bu to 18Bw for the first circuit and the second circuit, respectively.
[0043]
An operation device 19 for operating the switch 18 is disposed on a case 18C of the switch 18, and an operation output shaft of the operation device 19 has switches 18Au to 18Aw constituting the switch 18 via a connecting mechanism (not shown). And 18Bu to 18Bw movable contacts.
[0044]
In the equipment housing space 4B formed below the transformer tank 2, in addition to the conservator 8, eight power supply branch conductors 30u1, 30v1, 30w1, 30n1, 30u2, 30v2, 30w2, 30n2, and four circuits And earth leakage breakers 31A and 31B having the following.
[0045]
The feed branch conductors 30u1, 30v1, 30w1, 30n1, 30u2, 30v2, 30w2, and 30n2 are arranged side by side in a state facing the front plate 1a of the outer box 1, and are insulated and supported on the bottom plate 2f of the transformer tank. It is supported through an object 32.
[0046]
Among these feeder branch conductors, 30u1, 30v1, 30w1, and 30n1 are respectively connected to four circuits of the earth leakage breaker 31A via connection conductors (not shown), and the four circuits of the earth leakage breaker 31A each have four circuits. The secondary bushings 6u1, 6v1, 6w1, and 6n1 are connected to the center conductors of the secondary bushings 6A1, 6N1, and 6N1 through the connection conductor 33A.
[0047]
Similarly, the power supply branch conductors 30u2, 30v2, 30w2, and 30n2 are respectively connected to the center of the secondary bushings 6u2, 6v2, 6w2, and 6n2 through a connection conductor (not shown), four circuits of the earth leakage breaker 31B, and four connection conductors 33B. Connected to conductor.
[0048]
The power supply branch conductors 30u1, 30v1, 30w1, 30n1, 30u2, 30v2, 30w2, and 30n2 respectively have secondary cables 35u1, 35v1, 35w1, 35n1, 35u2, 35v2, 35w2 drawn out from the lower part of the outer box 1 into the underground trench. And 35n2 are connected.
[0049]
As described above, if the structure in which the inside of the transformer tank 2 is filled with the insulating oil is used, no air chamber is formed in the upper part in the transformer tank 2, so even if the height dimension of the transformer tank 2 is reduced as compared with the related art, An internal volume equivalent to that of a conventional transformer tank having an air chamber formed in the upper portion can be secured.
[0050]
Further, as described above, when the secondary bushing is attached to the bottom plate 2f of the transformer tank, a space for arranging the secondary bushing and a power supply branch for connecting the secondary cable are provided on the front side of the transformer tank 2. It is not necessary to secure a space for arranging the conductor. A radiator 7a is mounted on the front surface of the transformer tank 2, and a space for disposing the radiator 7a may be smaller in depth than a space for disposing the secondary bushing and the secondary cable. Therefore, when configured as described above, the depth dimension of the transformer tank 2 can be increased without increasing the depth dimension of the outer box 1.
[0051]
Further, as described above, a conservator for absorbing the expansion and contraction of the insulating oil in the transformer tank 2 is provided, and the conservator is connected to the transformer tank, so that when the temperature of the transformer rises, the transformer tank 2 The internal pressure of the transformer tank 2 does not increase, so that it is not necessary to increase the mechanical strength of the transformer tank 2 in preparation for the increase of the internal pressure, and the volume in the transformer tank can be increased accordingly.
[0052]
Therefore, even if the height dimension of the transformer tank is reduced to secure the equipment accommodation space below the transformer tank, the volume required for accommodating the transformer main body in the transformer tank is secured. be able to.
[0053]
Further, as described above, when the radiators 7a, 7b, 7d, 7e are attached to the other three side plates 2a, 2b, 2d except for one side plate 2c of the transformer tank and the ceiling plate 2e, respectively, the insulating oil Therefore, the temperature of the transformer can be kept within an allowable range even if the amount of heat generated from the transformer body 11 is increased.
[0054]
Therefore, it is possible to allow operation in a state in which the amount of heat generated from the transformer main body 11 is larger than in the conventional case. The size of the vessel can be reduced. Further, when the size of the transformer main body is made equal to that of the conventional case, it is possible to increase the capacity of the transformer while keeping the size of the outer box within the constraints.
[0055]
As a result of trial production of the transformer device according to the present invention, the other three side plates 2a, 2b, 2d and the ceiling plate 2e except for one side plate 2c of the transformer tank have the same external dimensions as the conventional road-mounted transformer device. By increasing the cooling efficiency of the transformer by attaching a radiator to the transformer, the capacity of the transformer could be increased to 1.7 times that of the conventional road-mounted transformer device.
[0056]
As described above, when the capacity of the transformer can be increased, the number of installed transformer devices on the road can be reduced, so that the cost of implementing the power distribution equipment can be reduced.
[0057]
In the above example, eight secondary bushings are provided, but the secondary bushings may be provided for at least one circuit (four when the secondary side is star-connected), and the number of secondary bushings is as described above. Is not limited to the example.
[0058]
In the above embodiment, the secondary bushings 6u1, 6v1, 6w1, 6n1, 6u2, 6v2, 6w2, and 6n2 are mounted on the bottom surface of the transformer tank. However, the mounting location of the secondary bushing is not necessarily on the bottom surface of the transformer tank. Not limited. For example, a portion without a radiator may be provided below the front side plate 2a of the transformer tank, and the secondary bushing may be attached to a lower portion of the front side plate 2a where no radiator is provided. .
[0059]
In the above example, a radiator is attached to each of the other three side plates 2a, 2b, 2d and the ceiling plate 2e except for the one side plate 2c to which the primary bushing of the transformer tank 2 is attached. At least, a radiator may be attached to the other three side plates 2a, 2b, 2d except for one side plate 2c of the transformer tank 2, and the radiator 7e attached to the ceiling plate 2e in the above example may be omitted. Good.
[0060]
In the present invention, since the inside of the transformer tank is completely filled with the insulating oil and the ceiling plate of the transformer tank is brought into contact with the insulating oil, heat can be radiated also from the ceiling plate of the transformer tank. Even when the radiator is attached only to the front side plate 2a, the rear side plate 2b, and the right side plate 2d of the transformer tank, the two side plates (the rear side plate and the right side plate) ), A radiator is attached only to the transformer tank, and the heat radiating effect of the transformer can be remarkably improved as compared with a conventional road-mounted transformer device in which an air chamber is formed in the upper part of the transformer tank.
[0061]
Also, when a radiator is attached only to the rear side plate 2b, the right side plate 2d, and the ceiling plate 2e of the transformer tank, the heat radiation effect of the transformer can be similarly enhanced as compared with the conventional one.
[0062]
In the above example, the fuse is housed in the fuse tube 16 attached to the outside of the transformer tank. However, a configuration in which the fuse is housed in the transformer tank may be adopted.
[0063]
In the above example, the switch 18 and the fuse 17 are provided between the primary side cable and the primary bushing. However, only one of the switch 18 and the fuse 17 may have a sufficient protection function. If possible, one of the switch 18 and the fuse 17 may be omitted.
[0064]
【The invention's effect】
As described above, according to the present invention, the cooling efficiency of the transformer is increased by attaching the radiators to at least three side plates except for one side plate of the transformer tank, so that the size of the transformer can be increased. The advantage is that the capacity can be increased without inviting.
[Brief description of the drawings]
FIG. 1 is a front view showing a configuration example of a road-mounted transformer device according to the present invention in a state where a front plate of an outer box is removed.
FIG. 2 is a plan view of the transformer device shown in FIG. 1 in a state where a ceiling plate of an outer box is removed.
FIG. 3 is a right side view of the transformer device with a side plate of an outer box removed.
FIG. 4 is a bottom view of the transformer device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Outer box, 2 ... Transformer tank, 5u-5w ... Primary bushing, 6u1-6w1, 6n1, 6u2-6w2, 6n2 ... Secondary bushing, 7a, 7b, 7d, 7e ... Radiator, 8 ... Conservator, Reference numeral 9: connecting pipe, 11: transformer body, 16u to 16w: fuse cylinder, 18: switch, 19: operating device.

Claims (3)

It has a rectangular parallelepiped transformer tank to which the primary bushing and the secondary bushing are attached, and a transformer main body accommodated in the transformer tank together with the insulating oil, and a primary terminal and a secondary terminal of the transformer main body are provided. A transformer electrically connected to the primary bushing and the secondary bushing, and an outer box accommodating the transformer, wherein a primary cable drawn into the outer box from underground is electrically connected to the primary bushing. In a road-mounted transformer device, a secondary cable electrically connected to the secondary bushing is drawn out from the lower part of the outer box to the basement,
The transformer tank is disposed in the outer box in a state where a device accommodation space is secured below the bottom plate,
The primary bushing is attached to one side plate of the transformer tank;
A radiator that cools the insulating oil is attached to the other three side plates of the transformer tank except for the one side plate, wherein the radiator is filled with the insulating oil so as to completely fill the inside of the transformer tank,
A conservator that absorbs expansion and contraction of the insulating oil in the transformer tank is disposed in the equipment storage space, and an upper part in the transformer tank and the conservator are connected through a connection pipe;
A road-mounted transformer device characterized by the following. It has a rectangular parallelepiped transformer tank to which the primary bushing and the secondary bushing are attached, and a transformer main body accommodated in the transformer tank together with the insulating oil, and a primary terminal and a secondary terminal of the transformer main body are provided. A transformer electrically connected to the primary bushing and the secondary bushing, and an outer box accommodating the transformer, wherein a primary cable drawn into the outer box from underground is electrically connected to the primary bushing. In a road-mounted transformer device, a secondary cable electrically connected to the secondary bushing is drawn out from the lower part of the outer box to the basement,
The transformer tank is disposed in the outer box in a state where a device accommodation space is secured below the bottom plate,
The primary bushing is attached to one side plate of the transformer tank;
A radiator that cools the insulating oil is attached to the other three side plates except the one side plate and the ceiling plate of the transformer tank that are filled with the insulating oil so as to completely fill the inside of the transformer tank. And
A conservator that absorbs expansion and contraction of the insulating oil in the transformer tank is disposed in the equipment storage space, and an upper part in the transformer tank and the conservator are connected through a connection pipe;
A road-mounted transformer device characterized by the following. The road-mounted transformer device according to claim 1, wherein the secondary bushing is attached to a bottom plate of the transformer tank.

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