JP7251884B2 - Molded stationary induction device - Google Patents

Description

Embodiments of the present invention relate to molded stationary induction devices.

2. Description of the Related Art Conventionally, mold-type stationary induction devices are known in which insulation performance is ensured by molding the surface of windings with an insulating material such as resin. Such a mold-type stationary induction device can be applied to higher voltages by storing the molded windings in a container and filling the container with dry air or the like.

A molded static induction device, in which the winding thus molded is housed in a container, is provided with bushings and connecting conductors corresponding to each winding in order to electrically connect the external wires and the windings in the container. . A bushing is provided in and through the ceiling portion of the container. The external wire is electrically connected to the bushing outside the container, and the connecting conductor electrically connects the winding and the bushing inside the container. Thereby, the windings of each phase are electrically connected to the external line via the connecting conductors and bushings.

In such a molded static induction device, it is necessary to ensure the insulation performance of the connecting conductors, so the outer surface of the connecting conductors is covered with an insulating member. However, for example, when the mold type static induction device is transported from the manufacturing factory of the induction device to the installation site and installed, it is inevitable that the mold type static induction device is subjected to vibration. When vibration is applied to the mold-type stationary induction device during transportation and installation, the vibration causes the connection conductor inside the container to shake and come into contact with other parts, resulting in the insulating member covering the outside of the connection conductor. was likely to be damaged.

JP 2015-225894 A

Therefore, a molded static induction device is provided that can suppress damage to the connection conductors even when the connection conductors are subjected to vibration due to transportation or the like.

A molded static induction device according to an embodiment has a high-voltage side winding and a low-voltage side winding, each of which has an iron core and an iron core that passes through the center of the winding. a plurality of device contents provided for each; a container for accommodating each of the device contents; a connecting conductor whose surface is covered with an insulating member and connected to the winding of each of the device contents; An external wire provided on the ceiling of the container corresponding to each of the connection conductors and connected to the connection conductor and an external wire provided outside the container to electrically connect the external wire and the connection conductor. a plurality of bushings; Among the bushings, the high-voltage side bushings corresponding to at least the high-voltage side windings are arranged above the corresponding equipment contents and at least part of the corresponding equipment contents and the high-voltage side bushings in plan view. A high-voltage side winding provided at an overlapping position and having a gap for flowing cooling gas between the high-voltage side winding and the low-voltage side winding, and connected to the high-voltage side winding among the connection conductors. The connection conductor is provided at a position that does not cover the upper side of the air gap, and each of the high-voltage side bushings is provided directly above the corresponding connection portion between the inside of the device and the high-voltage side connection conductor. The high voltage side connection conductor is composed of a non-bendable rigid body and extends in the vertical direction.

FIG. 1 shows a schematic configuration of a mold-type stationary induction device according to one embodiment, and is a vertical cross-sectional view showing a partially broken interior of the device. A plan view showing a schematic configuration of a mold-type stationary induction device according to one embodiment, with the container partially cut away. Equivalent view of FIG. 1 showing a schematic configuration of a mold-type stationary induction device according to a comparative example

An embodiment will be described below with reference to the drawings.
A molded transformer 10 shown in FIGS. 1 and 2 is an example of application of a molded stationary induction device, and is used, for example, in power systems and power receiving and transforming equipment. In this embodiment, the molded transformer 10 is a three-phase transformer having U-phase, V-phase, and W-phase windings. Note that the molded transformer 10 is not limited to a three-phase transformer.

The molded transformer 10 includes a device content 20, a container 30, a heat exchanger 40, connection conductors 51, 52, and bushings 61, 62. The equipment contents 20 are provided corresponding to each phase of the molded transformer 10 . For example, in the present embodiment, the molded transformer 10 is a three-phase transformer having U phase, V phase, and W phase, so there are three equipment components 20 corresponding to each of the U phase, V phase, and W phase. It has

The equipment contents 20 each have an iron core 21 , a high voltage side winding 22 , a low voltage side winding 23 and a spacer 24 . The high-voltage side winding 22 functions as a primary side winding to which high-voltage power is input when the molded transformer 10 is applied to, for example, a power system. The low-voltage side winding 23 functions as a secondary side winding that outputs low-voltage power when the molded transformer 10 is applied to, for example, a power system.

The surfaces of the high-voltage side winding 22 and the low-voltage side winding 23 are each covered with an insulating member such as resin. That is, the surfaces of the high-voltage side winding 22 and the low-voltage side winding 23 are molded with an insulating member such as resin having electrical insulation. The high-voltage side winding 22 and the low-voltage side winding 23 each constitute a coil in which the core 21 is passed through the center. In this case, the high voltage side winding 22 is provided on the outer peripheral side of the low voltage side winding 23 .

The iron cores 21 of each phase have a common upper yoke 211 and lower yoke 212, and the upper end and lower end of each iron core 21 are connected to each other by the upper yoke 211 and lower yoke 212, respectively. The lower yoke 212 is supported and fixed to the bottom of the container 30 . Therefore, even if the container 30 is vibrated, at least the lower end of the iron core 21 is less likely to move relative to the container 30 . That is, at least the lower end of the device content 20 is difficult to move relative to the container 30 .

Spacer 24 is provided between high-voltage side winding 22 and low-voltage side winding 23 . That is, the spacer 24 is provided on the inner peripheral side of the high-voltage winding 22 and on the outer peripheral side of the low-voltage winding 23 . The spacer 24 is formed in a corrugated shape over the entire circumferences of the high-voltage side winding 22 and the low-voltage side winding 23 . This spacer 24 forms an air gap 25 between the high voltage side winding 22 and the low voltage side winding 23 to secure a space for flowing cooling gas, and also to separate the high voltage side winding 22 and the low voltage side winding 23 from each other. Ensures the necessary insulation strength between Note that the spacer 24 is not limited to a corrugated shape as long as the shape of the spacer 24 can ensure insulation strength and cooling space between the high-voltage side winding 22 and the low-voltage side winding 23 .

The container 30 constitutes the outer shell of the molded transformer 10, and is mainly composed of a metal housing such as a steel plate. The container 30 is configured in the shape of an airtight box. The equipment content 20 is housed inside the container 30 . In the case of this embodiment, the three equipment contents 20 corresponding to each of the three phases are arranged in a straight line at equal intervals in the container 30 . For this reason, the container 30 is formed in a shape elongated in one direction as a whole, for example, in a rectangular box shape in plan view.

In this case, the adjacent device contents 20 and the device contents 20 and the inner wall surface of the container 30 are separated from each other. As a result, gaps 301 and 302 are secured between the adjacent device contents 20 and between the device contents 20 and the inner wall surface of the container 30, respectively. These gaps 301 and 302 ensure space for flowing cooling gas, and also ensure necessary insulation strength between the device contents 20 and between the device contents 20 and the inner wall of the container 30 .

The container 30 also has an upper connection duct 31 , a lower connection duct 32 , an opening 33 and a door 34 . The upper connection duct 31 and the lower connection duct 32 connect the inside of the container 30 and the heat exchanger 40 . That is, the inside of the container 30 and the heat exchanger 40 communicate with each other through the connection ducts 31 and 32 . In this case, the upper connection duct 31 is provided above the container 30 , specifically above the upper ends of the windings 22 , 23 . The lower connection duct 32 is provided below the upper connection duct 31 and below the container 30 , specifically below the lower ends of the windings 22 and 23 .

As shown in FIG. 2, the opening 33 is formed through a part of the surrounding wall of the container 30 to allow communication between the inside and the outside of the container 30 . In the case of the present embodiment, the opening 33 is provided in one wall surface of the four wall surfaces that form the periphery of the container 30 and extend in the vertical direction. Specifically, the opening 33 is provided at a position facing all the device contents 20 arranged in a line. In other words, the opening 33 is provided at a position and size that allows the operator to see the inside of the container 30 from the outside of the container 30 through the opening 33 at the same time. . This opening 33 functions as an inspection window when an operator inspects the condition inside the container 30 . Instead of the opening 33, a window made of transparent glass, reinforced plastic, or the like may be provided so that the inside of the container 30 can be visually recognized from the outside.

The door 34 is, for example, a hinged door, and is provided so as to be able to open and close the opening 33 . By opening the door 34 to open the opening 33 , the operator can perform necessary work such as inspection of the device contents 20 in the container 30 . Further, the door 34 can seal the opening 33 in a closed state. Therefore, when the door 34 is closed, the inside of the container 30 becomes an airtight space. In this case, the container 30 is filled with dry air or the like having a pressure higher than the atmospheric pressure. The dielectric strength of air is approximately proportional to its absolute pressure. Therefore, by filling the container 30 with dry air having a pressure higher than the atmospheric pressure, the molded transformer 10 can obtain a higher dielectric strength voltage than when the device contents 20 are installed in the atmospheric pressure. .

The heat exchangers 40 are provided on both sides of the container 30 in the longitudinal direction, and communicate with the inside of the container 30 via the upper connection duct 31 and the lower connection duct 32 . The heat exchanger 40 has a function of dissipating heat generated by the operation of the equipment contents 20 to the atmosphere. When the gas in the container 30 is heated by the heat generated in the device content 20, as indicated by the white arrows in FIG. It rises inside the container 30 through the space 25 formed inside.

Then, the gas rising inside the container 30 flows through the upper connection duct 31 into the heat exchanger 40 , and the heat of the gas is radiated to the atmosphere by the action of the heat exchanger 40 . After that, the gas whose temperature has been lowered by releasing heat flows into the container 30 from the lower connection duct 32 and rises again through the gaps 301 and 302 and the gap 25 . In this manner, a gas flow that naturally circulates within the container 30 is generated, and the device contents 20 are naturally cooled by the gas flow. In addition, for example, a blower may be provided in the connection ducts 31 and 32 or the like to forcefully circulate the gas in the container 30 . According to this, the cooling efficiency in the molded transformer 10 can be further improved.

As shown in FIG. 2, the molded transformer 10 has high-voltage side connection conductors 51 and low-voltage side connection conductors 52 for each device component 20 . As shown in FIG. 1, the high-voltage side connection conductor 51 includes a conductor portion 511 made of a conductive member and an insulating member 512 such as a resin covering the outer surface of the conductor portion 511. It is That is, the high-voltage side connection conductor 51 has the outer surface of the conductor portion 511 molded with an insulating material such as resin. The conductor portion 511 may be configured by, for example, twisting a plurality of conducting wires, or may be configured by a conductive metal rod or the like. Although not shown in detail, the low-voltage side connection conductor 52 also has a conductive portion and an insulating member such as resin covering the outer surface of the conductor, like the high-voltage side connection conductor 51. It is configured. That is, the low-voltage side connection conductor 52 is also molded with an insulating member such as resin on the outer surface of the conductor portion.

In this case, a larger current flows through the high voltage side connection conductor 51 than the low voltage side connection conductor 52 . Therefore, the diameter of the conductor portion 511 of the high-voltage side connecting conductor 51 is larger than the diameter of the conductor portion of the low-voltage side connecting conductor 52, and the insulating member 512 of the high-voltage side connecting conductor 51 is larger than the insulating member of the low-voltage side connecting conductor 52. thicker than Therefore, the high voltage side connection conductor 51 has higher rigidity than the low voltage side connection conductor 52 . In the case of this embodiment, the high voltage side connection conductor 51 does not have flexibility and can be regarded as a rigid body that cannot be bent. In other words, in the case of this embodiment, the high-voltage side connection conductor 51 cannot be easily bent by the force of an operator, and has such rigidity that the insulating member 512 would be damaged if it were to be forcibly bent. are doing.

On the other hand, the low-voltage side connection conductor 52 does not carry as much current as the high-voltage side connection conductor 51 . Therefore, the diameter of the conductor portion of the low-voltage side connecting conductor 52 can be made smaller than the diameter of the conductor portion 511 of the high-voltage side connecting conductor 51. can be made thinner than the insulating member of the Therefore, the low-voltage side connection conductor 52 can be made relatively more flexible than the high-voltage side connection conductor 51 .

2, the molded transformer 10 is provided with a high-voltage side bushing 61 and a low-voltage side bushing 62 corresponding to each equipment contents 20. As shown in FIG. The bushings 61 and 62 have the function of electrically connecting the connection conductors 51 and 52 of the windings 22 and 23 and the external wires 91 and 92 of the electric power system, power receiving and transforming equipment, etc., while ensuring insulation with respect to the container 30. have The bushings 61 and 62 of each phase respectively correspond to the equipment contents 20 of each phase, and are provided through the ceiling portion 35 of the container 30 . One end of each bushing 61 , 62 is exposed to the outside of the container 30 and the other end is inserted into the container 30 . In this case, the high voltage side bushing 61 corresponds to the high voltage side winding 22 of each equipment content 20 . Also, the low-voltage side bushing 62 corresponds to the low-voltage side winding 23 of each device component 20 .

As shown in FIG. 2, the high-pressure side bushings 61 and the low-pressure side bushings 62 are arranged in a straight line at regular intervals along the longitudinal direction of the container 30, respectively. In other words, the high pressure side bushings 61 and the low pressure side bushings 62 are arranged in a line at equal intervals along the arrangement of the equipment contents 20 of each phase. In this case, the intervals between the high-pressure side bushings 61 and the low-pressure side bushings 62 are equal to the intervals between the device contents 20 .

Also, in this case, each high-pressure side bushing 61 is provided in the ceiling portion 35 of the container 30 at the center in the width direction of the container 30 and closer to the opening 33 side than the center of each device content 20 . Each low pressure side bushing 62 is provided in the ceiling portion 35 of the container 30 at the center of the container 30 in the width direction and on the side opposite to the opening 33 with respect to the center of each device content 20 .

At least the high-pressure side bushing 61 of the bushings 61 and 62 is, as shown in FIG. In the case of the present embodiment, at least the high-pressure side bushing 61 of the bushings 61 and 62 corresponds to each of the equipment contents 20 and the high-pressure side bushing when viewed from above, that is, when the container 30 is seen through from above. 61 is provided at a position where it overlaps with at least part of it. That is, at least each of the high voltage side bushings 61 is provided above the equipment contents 20 having the high voltage side windings 22 to which they are connected. In this case, each high-voltage side bushing 61 is provided directly above the connection portion between the corresponding equipment content 20 and the high-voltage side connection conductor 51, that is, the connection portion 53 between the high-voltage side winding 22 and the high-voltage side connection conductor 51. . Each high voltage side connection conductor 51 extends in the vertical direction.

In addition, in the case of this embodiment, the low pressure side bushing 62 is also positioned so as not to completely overlap other devices other than the corresponding device contents 20 in a plan view, and is at least partially overlapped with the corresponding device contents 20 . are placed at overlapping positions. That is, each low-voltage side bushing 62 is provided above the equipment component 20 having the low-voltage side winding 23 to which it is connected. In this case, the low pressure side bushing 62 is provided at a position where it completely overlaps with each corresponding device contents 20 in plan view.

As shown in FIGS. 1 and 2, each high-voltage side bushing 61 is connected to a high-voltage side external line 91 of a power system or power receiving and transforming equipment outside the container 30, and inside the container 30, a high-voltage side connection conductor 51 It is connected to the. Further, each low-voltage side bushing 62 is also connected to the low-voltage side external line 92 of the electric power system or power receiving and transforming equipment outside the container 30, similarly to the high-voltage side bushing 61, and the low-voltage side connection conductor 52 is connected inside the container 30. It is connected to the. As a result, each equipment content 20 in the container 30 is electrically connected to the external wires 91 and 92 while ensuring insulation from the container 30 .

According to the embodiment described above, the molded transformer 10 includes a plurality of device contents 20, a container 30, connection conductors 51 and 52, and bushings 61 and 62. The equipment body 20 has a high-voltage side winding 22 and a low-voltage side winding 23, and an iron core 21 passed through the center of the high-voltage side winding 22 and the low-voltage side winding 23. The surface is covered with an insulating member such as resin. The molded transformer 10 has three components 20 corresponding to each phase, in the case of this embodiment, for each of the three phases.

The container 30 accommodates the device content 20 therein. The high-voltage side connection conductor 51 has a surface covered with an insulating member 512 such as resin, and is electrically connected to the high-voltage side winding 22 of each equipment 20 . The low-voltage side connection conductor 52 has a surface covered with an insulating material (not shown) such as resin, and is electrically connected to the low-voltage side winding 23 of each component 20 .

The high-voltage side bushings 61 correspond to the high-voltage side connection conductors 51 of the equipment contents 20 and are provided on the ceiling portion 35 of the container 30 . The high-voltage side bushing 61 is connected to the high-voltage side external wire 91 and the high-voltage side connection conductor 51 provided outside the container 30 , thereby electrically connecting the external wire 91 and the high-voltage side connection conductor 51 . The low-voltage side bushings 62 correspond to the low-voltage side connection conductors 52 of the equipment contents 20 and are provided on the ceiling portion 35 of the container 30 . The low-voltage side bushing 62 is connected to the low-voltage side external wire 92 and the low-voltage side connection conductor 52 provided outside the container 30 to electrically connect the external wire 92 and the low-voltage side connection conductor 52 .

Among the bushings 61 and 62, at least the high-voltage side bushing 61 corresponding to the high-voltage side winding 22 is provided above each corresponding device content 20 and at a position at least partially overlapping with each corresponding device content 20. It is In this case, each high pressure side bushing 61 is provided at a position that does not overlap with other device contents 20 other than the corresponding device contents 20 .

According to this configuration, each high voltage side winding 22 is positioned above the equipment contents 20 to which it is connected, and is positioned above the equipment contents 20 other than the equipment contents 20 to which it is connected. not According to this, as shown in the comparative example of FIG. The distance between the winding 22 and the corresponding high voltage side bushing 61 can be made as short as possible. That is, according to the present embodiment, the length of the high-voltage side connection conductor 51 can be made as short as possible, and the slack of the high-voltage side connection conductor 51 can be made as small as possible or without slack.

Therefore, even if the molded transformer 10 is subjected to vibration during transportation or installation work, the high-voltage side windings 22 are unlikely to sway, and even if they sway, the amplitude of the sway can be minimized. can be made as small as possible. As a result, damage to the insulating member 512 of each high-voltage side connection conductor 51 due to each high-voltage side connection conductor 51 swinging and coming into contact with the device contents 20, or the high-voltage side connection conductors 51 coming into contact with each other, is suppressed. be able to.

Here, the space above the gap 25 and the gaps 301 and 302 serves as a path through which cooling gas flows. In this case, as shown in the comparative example shown in FIG. 3, if the upper side of the air gap 25 and the gaps 301 and 302 are covered with the high voltage side connection conductor 51, the flow of the cooling gas is hindered, and the cooling efficiency is reduced. decreases.

In contrast, according to the present embodiment, as shown in FIG. 1, each high-voltage side connection conductor 51 does not cover the space 25 and the gaps 301 and 302 above. According to this, it is possible to prevent the high-pressure-side connection conductor 51 from obstructing the flow of the cooling gas, and it is possible to facilitate the flow of the cooling gas. As a result, it is possible to improve the cooling efficiency.

In addition, in the embodiment, each high voltage side bushing 61 is provided directly above the connection portion 53 between the corresponding equipment contents 20 and the high voltage side connection conductor 51 . Each high-voltage side connection conductor 51 extends vertically, that is, vertically. According to this, the distance between the connection portion 53 and the high voltage side bushing 61, that is, the length of the high voltage side connection conductor 51 can be minimized. Therefore, each high-voltage winding 22 can be made more difficult to swing, and even if it swings, the amplitude of the swing can be further reduced. As a result, the high-voltage side connection conductors 51 shake to contact the equipment contents 20 or the high-voltage side connection conductors 51 come into contact with each other, so that the insulating members 512 of the high-voltage side connection conductors 51 are more reliably prevented from being damaged. can be suppressed to

In the present embodiment, the low pressure side bushings 62 are also provided at positions above the corresponding device contents 20 and at least partially overlapping the corresponding device contents 20 in the same manner as the high pressure side bushings 61 . there is Specifically, each of the low-voltage side bushings 62 is also provided directly above the connection portion between the corresponding device contents 20 and the low-voltage side connection conductor 52, similarly to the high-voltage side bushing 61, and is vertically oriented, that is, in the vertical direction. extended. Therefore, similarly to the high-voltage side connection conductor 51, the low-voltage side connection conductor 52 can be suppressed from shaking when vibration is applied to the molded transformer 10. Damage can be suppressed.

Here, the high voltage side bushing 61 conducts a larger current than the low voltage side bushing 62 . Therefore, inspection of the high pressure side bushing 61 is considered to be more important and more frequent than inspection of the low pressure side bushing 62 . Therefore, in this embodiment, the container 30 has an opening 33 . The opening 33 is provided in one of the walls forming the periphery of the container 30, and is configured so that the inside of the container 30 can be checked from the outside. Each of the high-pressure side bushings 61 is arranged closer to the opening 33 in the ceiling 35 of the container 30 .

According to this, the operator can easily visually recognize each high pressure side bushing 61 through the opening 33 during inspection. Therefore, inspection of each high pressure side bushing 61, which is highly important and frequent, can be inspected easily and reliably.

In the above embodiment, the molded transformer is explained as an example of the molded static induction device, but the invention is not limited to this, and a molded reactor may be used.

Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope of the invention described in the claims and equivalents thereof, as well as the contents included in the scope and gist of the invention.

In the drawing, 10 is a molded transformer (molded stationary induction device), 20 is the inside of the device, 21 is an iron core, 22 is a high voltage side winding (winding), 23 is a low voltage side winding (winding), and 30 is a container. , 33 is an opening, 35 is a ceiling, 51 is a high-voltage side connection conductor (connection conductor), 512 is an insulating member, 52 is a low-voltage side connection conductor (connection conductor), 53 is a connection portion, 61 is a high-voltage side bushing (bushing ), 62 is a low-voltage side bushing (bushing), 91 is a high-voltage side external line (external line), and 92 is a low-voltage side external line (external line).

Claims (2)

a plurality of device contents provided for each phase, each of which has a high-voltage side winding, a low-voltage side winding, and an iron core passed through the center of the winding, and the surface of the winding is covered with an insulating member;
a container containing the contents of each of said devices;
a connection conductor whose surface is covered with an insulating member and is connected to the windings in each of the devices;
By connecting to the external wire and the connecting conductor provided on the ceiling portion of the container corresponding to each of the connecting conductors in each of the equipment contents and provided outside the container, the external wire and the connecting conductor are electrically connected. a plurality of bushings connecting to the physical connection;
with
Among the bushings, the high-voltage side bushings corresponding to at least the high-voltage side windings are arranged above the corresponding equipment contents and at least part of the corresponding equipment contents and the high-voltage side bushings in plan view. provided in an overlapping position,
A gap is formed between the high-voltage side winding and the low-voltage side winding for flowing a cooling gas,
Among the connection conductors, a high-voltage side connection conductor connected to the high-voltage side winding is provided at a position not covering the upper side of the gap,
Each of the high-voltage side bushings is provided directly above a connection portion between the corresponding equipment content and the high-voltage side connection conductor,
Each of the high-voltage side connection conductors is composed of a rigid body that cannot be bent and extends in a vertical direction,
Molded stationary induction device. The container has an opening through which the inside can be checked from the outside in one of the walls constituting the periphery of the container,
Among the bushings, at least the bushing corresponding to the high-voltage winding is arranged closer to the opening,
The molded stationary induction device according to claim 1 .

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