JP4139635B2 - Road-mounted transformer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a road-mounted transformer device.
[0002]
[Prior art]
In recent years, in urban areas, along with the undergrounding of distribution lines, road-mounted transformer devices have been installed on sidewalks along roads.
[0003]
As is well known, a road-mounted transformer device includes, for example, a transformer body with insulating oil in a rectangular parallelepiped transformer tank to which a primary bushing and a secondary bushing are attached. A transformer having a configuration in which the secondary side terminals are connected to the primary bushing and the secondary bushing, respectively, an outer box containing the transformer, and one side plate of the transformer tank (for example, the left side plate when the tank is viewed from the front) And a primary side accessory device including a switch and a fuse arranged in a space in an outer box formed on the side of the main body.
[0004]
An underground ditch is provided below the outer box, and the primary cable drawn from the underground into the outer box is connected to the primary side terminal of the transformer body through the primary side accessory and the primary bushing. In addition, a plurality of power supply branch conductors are connected to the secondary bushing of the transformer, and the secondary cables connected to the 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 formed. A primary bushing is attached to the upper part of the left side plate (in this example), and a primary side accessory such as a switch or a fuse is disposed below the primary bushing. The secondary bushing connected to the secondary terminal of the transformer body is attached to a portion corresponding to the air chamber on the upper side plate on the front surface of the transformer tank (the surface facing the front door of the outer box). A plurality of power feeding branch conductors (conductors for connecting secondary cables) connected to the secondary bushing are arranged on the front side of the transformer tank in a state of being positioned below the secondary bushing, It was supported against the tank.
[0006]
As described above, in the conventional road-mounted transformer device, the primary bushing is attached to one side plate (left side plate in the above example) of the transformer tank, and the primary side accessory is disposed on the side thereof. Because the secondary bushing is attached to the upper part of the front side plate and the branch conductor for power feeding is arranged, the left side plate of the transformer tank and the front side plate are used as the mounting surface of the radiator that cools the insulating oil. It could not be used. For this reason, in this type of conventional transformer device, the radiator is attached only to the right side plate and the back side plate of the transformer tank.
[0007]
[Problems to be solved by the invention]
In recent years, with increasing demand for electric power in urban areas, and in order to meet the needs for cost reduction of facilities, it is required to increase the transformer capacity of road-mounted transformers.
[0008]
On the other hand, for road-mounted transformers, strict restrictions are imposed on the external dimensions by the 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 is difficult to increase the capacity without increasing the external dimensions.
[0009]
Moreover, in order to beautify the urban environment, it is preferable to configure the on-road transformer as small as possible, and when it is not necessary to increase the capacity, it is desirable to reduce the overall external dimensions. However, since this type of conventional transformer is designed to increase its capacity to the structural limit, as long as the conventional structure is adopted, there is a limit in reducing the external dimensions.
[0010]
The object of the present invention is to increase the transformer capacity without increasing the outer dimensions, and when the capacity is the same as the conventional one, it is possible to reduce the outer dimensions. It is to provide a transformer device.
[0011]
[Means for Solving the Problems]
The present invention includes a rectangular parallelepiped transformer tank having a primary bushing and a secondary bushing attached thereto, and a transformer main body housed in the transformer tank together with insulating oil. A transformer having a side terminal electrically connected to the primary bushing and the secondary bushing, respectively, and an outer box housing the transformer, and a primary cable drawn into the outer box from the basement is electrically connected to the primary bushing. It is intended for a road-mounted transformer device in which a secondary cable electrically connected to the secondary bushing is drawn out from the lower part of the outer box to the basement.
[0012]
In this invention, a transformer tank is arrange | positioned in an outer case in the state which ensured the apparatus accommodation space under the baseplate, and a primary bushing is attached to one side plate of a transformer tank. In addition, an insulating oil is filled so as to completely fill the inside of the transformer tank, and a radiator for cooling the insulating oil is attached to the other three side plates excluding the one side plate of the transformer tank. Further, a conservator that absorbs expansion and contraction of the insulating oil in the transformer tank is disposed in the equipment accommodating space, and the upper part in the transformer tank and the conservator are connected through a connection pipe.
[0013]
As described above, when the air chamber that has been conventionally formed in the upper part of the transformer tank is eliminated and the transformer tank is filled with insulating oil, Air chamber Therefore, even if the height of the transformer tank is reduced, the volume required to accommodate the transformer main body can be secured in the transformer tank.
[0014]
As described above, if a conservator that absorbs expansion and contraction of the insulating oil in the transformer tank is provided and the conservator is connected to the transformer tank, the internal pressure of the transformer tank is increased when the temperature of the transformer increases. Therefore, it is not necessary to increase the mechanical strength of the transformer tank in preparation for an increase in internal pressure, and the transformer tank can be miniaturized.
[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 necessary for accommodating the transformer main body is secured in the transformer tank. be able to.
[0016]
In addition, as described above, when a radiator is attached to each of the other three side plates excluding the one side plate of the transformer tank, 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 body is increased, the temperature of the transformer can be kept within an allowable range.
[0017]
As a result, it is possible to operate with the heat generated from the transformer body larger than before, and if the transformer capacity is the same as before, the transformer body can be made smaller and The size of the vessel can be reduced. In addition, when the size of the transformer body is the same as that of the conventional case, the transformer capacity can be increased while keeping the dimensions of the outer box within the constraints.
[0018]
The conservator includes a container and a deformable diaphragm (made of a rubber film or the like) provided so as to partition the container into an oil chamber and an air chamber, and the oil chamber is connected via a connecting pipe. A known diaphragm conservator connected to the upper part of the transformer tank and having an air chamber communicating with the outside air can be used.
[0019]
In a preferred aspect of the present invention, the radiator is attached to each of the other three side plates and the ceiling plate excluding the one side plate of the transformer tank. If comprised in this way, the cooling efficiency of insulating oil can further be improved.
[0020]
The secondary bushing can be attached to the lower part of the side plate other than the one side plate of the transformer tank (preferably the side plate on the front side of the transformer tank), for example, but the secondary bushing is preferably attached to the bottom plate. Is preferred.
[0021]
In this way, if the secondary bushing is attached to the bottom plate of the transformer tank, it is not necessary to secure the space for attaching the secondary bushing to the side plate of the transformer tank. The size of the heatsink attached to is not limited. Therefore, each radiator can be attached by effectively using the space of the entire side plate of the transformer tank, and the cooling performance of the insulating oil can be enhanced.
[0022]
When the secondary bushing is attached to the bottom plate of the transformer tank as described above, only the radiator having a smaller depth dimension than the secondary bushing needs to be attached to the side plate on the front side of the transformer tank. The depth dimension of the transformer tank can be increased without increasing the depth dimension.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to 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. 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. In FIGS. 1 to 3, illustration of a part of the radiator attached to the transformer tank is omitted for convenience.
[0024]
1 to 4, reference numeral 1 denotes an outer box configured in a rectangular parallelepiped shape by a base frame 1 </ b> A made of a shape steel material, a front plate 1 a and a back plate 1 b, left and right side plates 1 c and 1 d, and a ceiling plate 1 e. 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 mount 3. The transformer tank includes a front side plate 2a and a rear side plate 2b, The side plates 2c and 2d, the ceiling plate 2e, and the bottom plate 2f are formed in a rectangular parallelepiped shape.
[0026]
In the present specification, of the four side plates 2a to 2d of the transformer tank 2, one 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 the front side plate 2a and the back side. A side plate 2b on the side is used. The transformer tank 2 is arranged in the outer case 1 with the side plate 2a on the front side facing the front plate 1a of the outer case 1.
[0027]
The transformer tank 2 is arranged in a state of being close to one end side in the width direction of the outer box 1 (on the right side plate 1d side in the illustrated example), and one side plate (in the illustrated example in the illustrated example). A space in the outer box formed on the side of the left side plate) is used as a primary-side device storage space 4A in which primary side accessory devices such as fuses and switches are arranged. Further, in the illustrated example, the space below the bottom surface of the transformer tank 2 is used as a device storage space 4B for storing secondary side accessory devices, conservators, and the like.
[0028]
The left side plate 2c and the bottom plate 2f of the transformer tank 2 are made of flat steel plates, and three-phase primary bushings 5u to 5w are attached to the lower portion of the side plate 2c side by side in the depth direction of the transformer tank. Includes two secondary bushings 6u1, 6v1, 6w1, 6n1 provided for each of the three-phase secondary terminal on the non-neutral point side and the secondary terminal on the neutral point side of the transformer body. , 6u2, 6v2, 6w2 and 6n2 are mounted side by side in the width direction of the transformer tank (see FIG. 4). Of these secondary bushings, those with suffixes u, v, and w (6u1, 6v1, 6w1, 6u2, 6v2, and 6w2) are secondary terminals on the non-neutral point side of the U, V, and W3 phases. The secondary bushings provided for the secondary terminal are indicated by (6n1, 6n2), and the secondary bushings provided for the secondary terminal on the neutral point side.
[0029]
As can be seen in FIG. 1, each primary bushing penetrated through the soot pipe 5 a and the soot pipe 5 a attached in a state of oil tightly penetrating the mounting hole provided in the lower part of the side plate 2 c of the transformer tank. It consists of a central conductor 5b. Moreover, as shown in FIG. 3, each secondary bushing penetrated the soot pipe 6a oil-tightly through the soot pipe 6a attached in a state of oil-tightly penetrating the mounting hole provided in the bottom plate 2f of the transformer tank. It consists of a center conductor 6b.
[0030]
In the present invention, the radiators 7a, 7b and 7d are attached to at least the other three side plates 2a, 2b and 2d other than the one side plate 2c of the transformer tank 2, respectively. In the example shown in the figure, corrugation is applied to the steel plates constituting the front side plate 2a, the rear side plate 2b, and the right side plate 2d of the transformer tank, and the front side plate 2a and the rear side plate 2b. A large number of hollow radiating fins 2a1, 2b1 and 2d1 are formed on the right side plate 2d, and the radiating fins 7a, 7b and 7d are constituted by these radiating fins, respectively.
[0031]
In the present embodiment, the ceiling plate 2e of the transformer tank 2 is made of a steel plate that has not been corrugated, and a metal having a good thermal conductivity is formed on the upper surface of the ceiling plate 2e. A large number of radiating fins 2e1, 2e1,..., Which are bent so as to exhibit the above, are attached by welding, and a radiator 7e is constituted by these radiating fins 2e1, 2e1,.
[0032]
A conservator 8 is disposed 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 uppermost portion of the transformer tank 2 and the conservator 8. 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 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 connecting pipe 9 is provided between the radiator fins 2b1 of the radiator provided on the side plate on the back side of the transformer tank 2, and one end of the connecting pipe 9 is provided through the hole provided in the ceiling plate 2e of the transformer tank 2. 2 is connected to the uppermost part. The other end of the connection pipe 9 is connected to the oil chamber 802 of the conservator 8.
[0033]
A transformer body 11 is accommodated in the transformer tank 2. The illustrated transformer body 11 includes a three-leg iron core 12 whose upper and lower yoke portions are clamped by yoke clamps 12A and 12B, and a three-phase winding 13u wound around the three leg portions of the iron core 12, respectively. ˜13w, the transformer body is formed by fastening the lower yoke fastening bracket 12B to the fixing bracket 14 fixed to the bottom plate 2f of the transformer tank 2. 2 is fixed.
[0034]
The three-phase primary winding of the transformer body 11 is Δ-connected, and the three-phase terminal (primary terminal of the transformer body) of the primary winding is the center of the primary bushings 5u to 5w in the transformer tank 2 It is connected to one end side of the conductor 5b.
[0035]
The three-phase secondary winding of the transformer body 11 is star-connected, and the secondary side of the transformer body drawn from the neutral point of the secondary winding and the three-phase non-neutral point terminal, respectively. The terminals are respectively connected to the center conductors of corresponding secondary bushings attached to the bottom plate 2f of the transformer tank.
[0036]
As described above, in this embodiment, two secondary bushings 6n1 and 6n2 are provided for the neutral point of the secondary winding, and the non-neutral point side of the U, V, and W3 phases of the transformer main body is provided. Two secondary bushings (6u1, 6u2), (6v1, 6v2) and (6w1, 6w2) are provided for each secondary side terminal of the secondary terminal, and a total of eight secondary bushings 6u1, 6v1, 6w1 are provided. , 6n1, 6u2, 6v2, 6w2 and 6n2 are arranged on the bottom plate 2f in a state where they are arranged in a line at equal intervals in the width direction of the transformer tank 2 (the direction perpendicular to the paper surface of FIG. 3, the lateral direction of FIG. 1). It is attached. The secondary side terminal on the neutral point side of the secondary winding of the transformer main body 11 and the secondary side terminal on the non-neutral point side of the three-phase are the two corresponding secondary bushings in the transformer tank 2. The center conductor 6b is connected through a connection conductor (not shown).
[0037]
The ceiling plate 2e of the transformer tank 2 is provided with an oil filling port 201 that is normally closed by a stopper, and insulating oil is injected into the transformer tank 2 and the oil chamber 802 of the conservator 8 from the oil filling port 201. The In the present invention, in the transformer tank 2, the connection pipe 9, and the oil chamber 802 of the conservator 8 (see FIG. 3) so that no air chamber is formed in the upper part of the transformer tank 2. Insulating oil is filled so as to completely fill the inside. As this insulating oil, it is desirable to use silicon oil or mineral oil having high heat resistance.
[0038]
The transformer 15 is comprised by the said transformer tank 2 and the transformer main body 11 accommodated with the insulating oil in the inside.
[0039]
Connected to the lower part of the left side surface of the transformer tank 2 facing the primary equipment housing space 4A are three-phase fuse cylinders 16u to 16w configured to receive respective center conductors of the three-phase primary bushings 5u to 5w. Has been. A hole for receiving the central conductor 5b of the primary bushings 5u to 5w is formed in the 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 corrugated pipes 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 surface of the transformer tank 2 through the three-phase primary bushings 5u to 5w of the soot tube 5a, and the three-phase primary bushings A central 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 disposed in the fuse cylinders 16u to 16w are connected to the respective central conductors 5b of the primary bushings 5u to 5w in the fuse cylinders 16u to 16w, and the upper electrodes of the three-phase fuses. 17c is connected to a terminal conductor (not shown) that extends upward through end walls that close the upper ends of the fuse cylinders 16u to 16w.
[0041]
The switch 18 includes switches 18Au to 18Aw that respectively constitute a three-phase cutoff part for the first circuit and switches 18Bu to 18Bw that respectively constitute a three-phase cutoff part for the second circuit in the outer box 1. The upper end of the three-phase fuse cylinder 16 is inserted into the case 18C. One terminal 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 the connection conductor 18D, and the switches 18Au to 18Aw and 18Bu for each phase. The other terminal of .about.18Bw is connected to a terminal of a cable connector (not shown) attached to the lower end of the case 18C.
[0042]
In the primary equipment storage space 4A, three-phase primary cables 21Au to 21Aw of the first circuit and three-phase primary cables 21Bu to 21Bw of the second circuit are set up from the underground ditch. The 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 is provided with switches 18Au to 18Aw constituting the switch 18 via a coupling mechanism (not shown). And 18Bu to 18Bw movable contacts.
[0044]
In addition to the conservator 8, the equipment housing space 4B formed below the transformer tank 2 further includes eight feeding branch conductors 30u1, 30v1, 30w1, 30n1, 30u2, 30v2, 30w2, 30n2, and four circuits. The earth-leakage circuit breakers 31A and 31B which have are arranged.
[0045]
The power supply 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 via the object 32.
[0046]
Of these feeding 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 each of the four circuits of the earth leakage breaker 31A is four. It is connected to the central conductors of the secondary bushings 6u1, 6v1, 6w1 and 6n1 through the connecting conductor 33A.
[0047]
Similarly, the feeding branch conductors 30u2, 30v2, 30w2 and 30n2 are respectively connected to the centers of the secondary bushings 6u2, 6v2, 6w2 and 6n2 through the connection conductors (not shown), the four circuits of the leakage breaker 31B and the four connection conductors 33B. Connected to conductor.
[0048]
Secondary cables 35 u 1, 35 v 1, 35 w 1, 35 n 1, 35 u 2, 35 v 2, 35 w 2 are respectively drawn out from the lower part of the outer box 1 into the underground grooves. And 35n2 are connected.
[0049]
As described above, when the transformer tank 2 is filled with insulating oil, an air chamber is not formed in the upper part of the transformer tank 2, so that even if the height dimension of the transformer tank 2 is reduced as compared with the conventional case, An internal volume equivalent to that of a conventional transformer tank having an air chamber formed in the upper part can be secured.
[0050]
Further, as described above, when the secondary bushing is attached to the bottom plate 2f of the transformer tank, the space for arranging the secondary bushing on the front side of the transformer tank 2 and the branch for power supply connecting the secondary cable are connected. There is no need to secure a space for arranging the conductor. Although the radiator 7a is attached to the front surface of the transformer tank 2, the space for arranging the radiator 7a may be smaller in depth than the space for arranging the secondary bushing or the secondary cable. Therefore, if comprised as mentioned 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, when a conservator that absorbs expansion and contraction of the insulating oil in the transformer tank 2 is provided and the conservator is connected to the transformer tank, when the temperature of the transformer rises, the transformer tank 2 Therefore, 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 necessary for accommodating the transformer main body is secured in the transformer tank. be able to.
[0053]
Further, as described above, if the radiators 7a, 7b, 7d, and 7e are attached to the other three side plates 2a, 2b, and 2d and the ceiling plate 2e except for one side plate 2c of the transformer tank, the insulating oil Therefore, even if the amount of heat generated from the transformer body 11 is increased, the temperature of the transformer can be kept within an allowable range.
[0054]
Therefore, it becomes possible to allow the operation with the amount of heat generated from the transformer main body 11 larger than before, and when the transformer capacity may be equal to the conventional one, the transformer main body is made smaller, The size of the vessel can be reduced. In addition, when the size of the transformer body is the same as that of the conventional case, the transformer capacity can be increased while keeping the dimensions 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 the one side plate 2c of the transformer tank have the same outer dimensions as those of the conventional road-mounted transformer device. By installing a radiator and increasing the cooling efficiency of the transformer, the transformer capacity could be increased up to 1.7 times that of the conventional on-road transformer device.
[0056]
In this way, if the transformer capacity can be increased, the number of installed on-road transformer devices can be reduced, so that the cost of power distribution equipment can be reduced.
[0057]
In the above example, eight secondary bushings are provided, but it is sufficient to provide at least one secondary bushing (four if the secondary side is star-connected), and the number of secondary bushings is as described above. It is not limited to the example.
[0058]
In the above embodiment, the secondary bushings 6u1, 6v1, 6w1, 6n1, 6u2, 6v2, 6w2 and 6n2 are attached to the bottom surface of the transformer tank, but the secondary bushing is not necessarily attached to the bottom surface of the transformer tank. It is not limited. For example, a portion where the radiator is not provided may be provided at the lower portion of the front side plate 2a of the transformer tank, and the secondary bushing may be attached to the lower portion of the front side plate 2a where the radiator is not provided. .
[0059]
In the above example, radiators are respectively attached to the other three side plates 2a, 2b, 2d and the ceiling plate 2e except the one side plate 2c to which the primary bushing of the transformer tank 2 is attached. It is sufficient to attach a radiator to at least 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, the interior of the transformer tank is completely filled with insulating oil, and the ceiling plate of the transformer tank is brought into contact with the insulating oil, so that heat can be dissipated from the ceiling plate of the transformer tank. Even if the radiator is attached only to the side plate 2a on the front side of the transformer tank, the side plate 2b on the back side, and the side plate 2d on the right side, the two side plates of the transformer tank (the side plates on the back side and the right side) ), The heat radiation effect of the transformer can be greatly enhanced compared to a conventional road-mounted transformer device in which a radiator is attached only to the upper part of the transformer tank.
[0061]
Similarly, when the radiator is attached only to the side plate 2b on the back side of the transformer tank, the side plate 2d on the right side, and the ceiling plate 2e, the heat radiation effect of the transformer can be enhanced more than the conventional one.
[0062]
In the above example, the fuse is accommodated in the fuse cylinder 16 attached to the outside of the transformer tank, but a configuration in which the fuse is accommodated in the transformer tank may be adopted.
[0063]
In the above example, the switch 18 and the fuse 17 are provided between the primary 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 can 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 a radiator to at least three side plates excluding one side plate of the transformer tank. There is an advantage that the capacity can be increased without incurring.
[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 with a front plate of an outer box removed.
FIG. 2 is a plan view of the transformer device shown in FIG. 1 with the ceiling plate of the outer box 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, DESCRIPTION OF SYMBOLS 9 ... Connection pipe | tube, 11 ... Transformer main body, 16u-16w ... Fuse cylinder, 18 ... Switch, 19 ... Operation device.

Claims (3)

A transformer tank having a rectangular parallelepiped shape with a primary bushing and a secondary bushing attached thereto, and a transformer body housed in the transformer tank together with insulating oil, the primary terminal and the secondary terminal of the transformer body are A transformer electrically connected to the primary bushing and the secondary bushing, respectively, and an outer box containing the transformer, and a primary cable drawn from the underground into the outer box is electrically connected to the primary bushing. In the on-road type transformer device in which the secondary cable electrically connected to the secondary bushing is drawn to the basement from the lower part of the outer box,
The transformer tank is arranged in the outer box in a state in which a device accommodating space is secured below the bottom plate,
The primary bushing is attached to one side plate of the transformer tank;
The insulating oil is filled so as to completely fill the transformer tank, and a radiator that cools the insulating oil is attached to the other three side plates except the one side plate of the transformer tank,
A conservator that absorbs expansion and contraction of the insulating oil in the transformer tank is disposed in the device accommodating space, and an upper portion in the transformer tank and the conservator are connected through a connection pipe;
A road-mounted transformer device characterized by A transformer tank having a rectangular parallelepiped shape with a primary bushing and a secondary bushing attached thereto, and a transformer body housed in the transformer tank together with insulating oil, the primary terminal and the secondary terminal of the transformer body are A transformer electrically connected to the primary bushing and the secondary bushing, respectively, and an outer box containing the transformer, and a primary cable drawn from the underground into the outer box is electrically connected to the primary bushing. In the on-road type transformer device in which the secondary cable electrically connected to the secondary bushing is drawn to the basement from the lower part of the outer box,
The transformer tank is arranged in the outer box in a state in which a device accommodating space is secured below the bottom plate,
The primary bushing is attached to one side plate of the transformer tank;
The insulating oil is filled so as to completely fill the transformer tank, and a radiator for cooling the insulating oil is attached to the other three side plates and the ceiling plate except the one side plate of the transformer tank. And
A conservator that absorbs expansion and contraction of the insulating oil in the transformer tank is disposed in the device accommodating space, and an upper portion in the transformer tank and the conservator are connected through a connection pipe;
A road-mounted transformer device characterized by The road-mounted transformer device according to claim 1 or 2, wherein the secondary bushing is attached to a bottom plate of the transformer tank.

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