Indoor layered transformer system

Abstract

The utility model discloses an indoor layered transformer system, which comprises a transformer oil tank and a radiator which are arranged in a layered manner, and further comprises an oil guide pipe for connecting the transformer oil tank and the radiator, and is characterized in that the oil guide pipe comprises a first connecting pipe, a second connecting pipe and a movable connecting pipe, a first port of the first connecting pipe is connected with an oil port of the radiator, a second port of the first connecting pipe faces upwards or downwards, a first port of the second connecting pipe is connected with an oil port of the transformer oil tank, a second port of the second connecting pipe faces downwards or upwards, the movable connecting pipe is a straight pipe, and the movable connecting pipe is connected with the radiator. And during field installation, two ports of the movable connecting pipe are respectively connected to the second port of the first connecting pipe and the second port of the second connecting pipe. A lifting platform does not need to be installed during assembly in a factory area, and meanwhile, the assembly heights of the radiator and the transformer oil tank are reduced to the same horizontal plane, so that the assembly difficulty is reduced, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of transformers, in particular to an indoor layered transformer system. Background Art

[0002] In recent years, with the rapid development of power transmission and transformation projects in my country, the urban power load has continued to increase, and the requirements for substation main transformers have continued to increase. In order to meet the relevant requirements of land saving and noise reduction, technicians in this field have arranged the transformer oil tank and radiator of the transformer system in layers.

[0003] An oil pipe is provided between the layered radiator and the transformer oil tank, and the transformer oil circulates between the radiator and the transformer oil tank through the oil pipe. Since the radiator and the transformer oil tank are arranged in layers indoors, the oil pipe has not only a horizontal part but also a vertical part. In the process of assembling the transformer system, it is necessary to set up an elevated platform in the factory to complete the assembly of the oil pipe. During the assembly process, the operator needs to climb up many times. Such operation not only increases the difficulty of assembly, but also reduces the assembly efficiency.

[0004] Therefore, how to simplify the assembly difficulty of the indoor layered transformer system and improve the assembly efficiency is a key issue that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the present invention is to simplify the assembly difficulty of an indoor layered transformer system and improve the assembly efficiency.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An indoor layered transformer system comprises a transformer oil tank and a radiator arranged in layers, and also comprises an oil guide pipe for connecting the transformer oil tank and the radiator, characterized in that the oil guide pipe comprises a first connecting pipe, a second connecting pipe and a movable connecting pipe, the first port of the first connecting pipe is connected to the oil port of the radiator, the second port of the first connecting pipe faces upward or downward, the first port of the second connecting pipe is connected to the oil port of the transformer oil tank, the second port of the second connecting pipe faces downward or upward, the movable connecting pipe is a straight pipe, and the two ports of the movable connecting pipe are respectively connected to the second port of the first connecting pipe and the second port of the second connecting pipe during on-site installation.

[0008] Preferably, the radiator is located above the transformer oil tank, and the radiator is arranged in an oil guide frame. The first connecting pipe includes a first vertical connecting pipe, and the first vertical connecting pipe includes a first upper vertical connecting pipe and a first lower vertical connecting pipe. The port where the first upper vertical connecting pipe is connected to the first lower vertical connecting pipe is flush with the bottom surface of the oil guide frame, and the lower port of the first lower vertical connecting pipe is connected to the upper port of the movable connecting pipe; the second connecting pipe includes a second vertical connecting pipe, and the upper port of the second vertical connecting pipe is connected to the lower port of the movable connecting pipe.

[0009] Preferably, the first lower vertical connecting pipe includes a vertical corrugated pipe section, the second connecting pipe includes a second horizontal connecting pipe extending from the transformer oil tank toward the second vertical connecting pipe, the second horizontal connecting pipe is connected to the lower port of the second vertical connecting pipe, and the second horizontal connecting pipe includes a horizontal corrugated pipe section.

[0010] Preferably, during factory assembly, one end of the movable coupling is fully welded with a flange, and the other end is spot-welded with a flange; during on-site assembly, the spot-welded flange is removed and the length of the movable coupling is adjusted according to the actual installation size. After adjustment, the removed flange is fully welded to the end of the movable coupling.

[0011] Preferably, the first connecting pipe comprises a first horizontal connecting pipe extending from the radiator toward the first upper vertical connecting pipe, a port of the first horizontal connecting pipe is connected to an upper port of the first upper vertical connecting pipe, a plurality of first supports are arranged along the first horizontal connecting pipe, a bottom surface of the first support is in contact with the ground for supporting the radiator, and the first horizontal connecting pipe is connected to the plurality of first supports;

[0012] The second connecting pipe includes a second horizontal connecting pipe extending toward the second vertical connecting pipe, a port of the second horizontal connecting pipe is connected to a lower port of the second vertical connecting pipe, a plurality of second supports are arranged along the second horizontal connecting pipe, the second horizontal connecting pipe is connected to the plurality of second supports, and a bottom surface of the second support is in contact with the ground for supporting the transformer oil tank.

[0013] Preferably, a first rubber shock-absorbing pad is provided between the first horizontal connecting pipe and the first support, and a second rubber shock-absorbing pad is provided between the second horizontal connecting pipe and the second support.

[0014] Preferably, there are multiple oil guide pipes, each of which connects the transformer oil tank and a corresponding oil port on the radiator.

[0015] Preferably, a high-voltage bushing and a neutral point bushing are provided on the transformer oil tank, and a current transformer is provided inside the transformer oil tank. There are multiple current transformers, and the multiple current transformers are all arranged on the outside of the side poles. One end of each of the current transformers is connected to one of the high-voltage bushings through a wire, and the other ends of all the current transformers are connected to the neutral point bushing.

[0016] Preferably, a neutral point bushing and a neutral point grounding system are provided on the transformer tank, and the neutral point grounding system comprises a first insulating support and a second insulating support, the first insulating support is connected to the raised seat of the neutral point bushing by bolts, the second insulating support is connected to the shell of the transformer tank by bolts, there are multiple second insulating supports, and the copper busbar led out from the neutral point bushing is clamped on the first insulating support and the second insulating support.

[0017] Preferably, a high-voltage bushing and a medium-voltage bushing are provided on the transformer oil tank, and both the high-voltage bushing and the medium-voltage bushing are oil-SF6 bushings.

[0018] It can be seen from the above technical solution that the utility model disconnects the oil guide pipe in the height direction to form a first connecting pipe, a movable connecting pipe and a second connecting pipe. In the factory area, the radiator and the first connecting pipe, as well as the transformer oil tank and the second connecting pipe can be assembled at the same level. During on-site installation, the length of the movable connecting pipe is adjusted according to the actual installation size, and then the first connecting pipe connected to the radiator and the second connecting pipe connected to the transformer oil tank are connected through the movable connecting pipe. When assembling in the factory area, there is no need to install a lifting platform, and the assembly height of the radiator and the transformer oil tank are lowered to the same horizontal plane, thereby reducing the difficulty of assembly and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 It is a front view of the indoor layered transformer system disclosed in the embodiment of the utility model;

[0021] Figure 2 A side view of an indoor layered transformer system disclosed in an embodiment of the utility model;

[0022] Figure 3It is a schematic diagram of the structure of the transformer oil tank and the radiator during the factory assembly disclosed in the embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the movable coupling pipe disclosed in the embodiment of the utility model;

[0024] Figure 5 It is a front view of the indoor layered transformer system disclosed in the embodiment of the utility model;

[0025] Figure 6 This is a front view of the transformer oil tank disclosed in the embodiment of the utility model.

[0026] The names of the components are as follows:

[0027] 101-first horizontal connecting pipe, 102-first upper vertical connecting pipe, 103-vertical corrugated pipe section, 104-first lower vertical connecting pipe, 201-second horizontal connecting pipe, 202-second vertical connecting pipe, 203-horizontal corrugated pipe section, 3-movable connecting pipe, 4-transformer oil tank, 5-radiator, 6-oil guide frame, 7-first support, 8-second support, 9-corrugated oil storage cabinet, 10-high-voltage bushing, 11-medium-voltage bushing, 12-neutral point bushing, 13-first insulating support, 14-second insulating support, 15-current transformer, 16-pressure release device. DETAILED DESCRIPTION

[0028] In view of this, the core of the present invention is to simplify the assembly difficulty of the indoor layered transformer system and improve the assembly efficiency.

[0029] In order to make the technical personnel in this field better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Figures 1 to 6 .

[0030] The indoor layered transformer system disclosed in the utility model includes a transformer oil tank 4 and a radiator 5 arranged in layers, and also includes an oil guide pipe for connecting the transformer oil tank 4 and the radiator 5. The oil guide pipe includes a first connecting pipe, a second connecting pipe and a movable connecting pipe 3. The first port of the first connecting pipe is connected to the oil port of the radiator 5, and the first port of the second connecting pipe is connected to the oil port of the transformer oil tank 4. The second port of the first connecting pipe faces upward or downward, and the second port of the second connecting pipe faces downward or upward. The movable connecting pipe 3 is a vertical pipe. During on-site assembly, the length of the movable connecting pipe 3 is adjusted according to the actual installation size, and then the two ports of the movable connecting pipe 3 are respectively connected to the second port of the first connecting pipe and the second port of the second connecting pipe.

[0031] In the utility model, the oil guide pipe is disconnected in the height direction to form a first joint pipe, a movable joint pipe 3 and a second joint pipe. In the factory area, the radiator 5 and the first joint pipe, as well as the transformer oil tank 4 and the second joint pipe can be assembled on the same level. Figure 3 When installing on site, the length of the movable connecting pipe 3 is adjusted according to the actual installation size, and then the first connecting pipe connected to the radiator 5 and the second connecting pipe connected to the transformer oil tank 4 are connected through the movable connecting pipe 3. When assembling in the factory, there is no need to install a lifting platform, and the assembly heights of the radiator 5 and the transformer oil tank 4 are lowered to the same horizontal plane, thereby reducing the difficulty of assembly and improving the assembly efficiency.

[0032] In the specific embodiment of the utility model, the radiator 5 is arranged above the transformer oil tank 4. That is, the radiator 5 is located on the second-floor platform, and the transformer oil tank 4 is located on the first-floor platform. The radiator 5 is arranged in the oil guide frame 6. The first connecting pipe connected to the radiator 5 includes a first vertical connecting pipe, and the first vertical connecting pipe extends downward to be connected with the second connecting pipe. The first vertical connecting pipe includes a first upper vertical connecting pipe 102 and a first lower vertical connecting pipe 104, and the port where the first upper vertical connecting pipe 102 and the first lower vertical connecting pipe 104 are connected is flush with the bottom surface of the oil guide frame 6. When the radiator 5 is assembled in the factory area, the first upper vertical connecting pipe 102 is assembled to the radiator 5, and the lower port of the first upper vertical connecting pipe 102 is flush with the bottom surface of the oil guide frame 6. When installing on site, the assembled radiator 5 is hoisted to the second-floor platform, and at the same time, it is ensured that the lower port of the first upper vertical connecting pipe 102 is flush with the second-floor platform, so that the installation reference of the transformer system is formed, and the installation accuracy of the transformer system is improved.

[0033] The lower port of the first upper vertical connecting pipe 102 is connected to the upper port of the first lower vertical connecting pipe 104. The lower port of the first lower vertical connecting pipe 104 is connected to the upper port of the movable connecting pipe 3. The second connecting pipe includes a second vertical connecting pipe 202, and the upper port of the second vertical connecting pipe 202 is connected to the lower port of the movable connecting pipe 3.

[0034] In the specific embodiment of the utility model, a vertical corrugated pipe section 103 is arranged in the first lower vertical connecting pipe 104. The second connecting pipe includes a second horizontal connecting pipe 201 extending from the transformer oil tank 4 to the second vertical connecting pipe 202, the second horizontal connecting pipe 201 is connected to the lower end of the second vertical connecting pipe 202, and the second horizontal connecting pipe 201 includes a horizontal corrugated pipe section 203. The vertical corrugated pipe section 103 is used to adjust the tolerance of the oil guide pipe in the vertical direction, and the horizontal corrugated pipe section 203 is used to adjust the tolerance of the oil guide pipe in the horizontal direction, so that the welding process of the oil guide pipe is more controllable and simpler.

[0035] The two ends of the vertical bellows section 103 can be connected to the other pipe sections of the first lower vertical connecting pipe 104 through flanges. The two ends of the horizontal bellows section 203 can be connected to the other pipe sections of the second horizontal connecting pipe 201 through flanges. The first upper vertical connecting pipe 102 and the first lower vertical connecting pipe 104 are connected by flanges. When the radiator 5 is hoisted to the second-floor platform, ensure that the flange at the lower port of the first upper vertical connecting pipe 102 is flush with the second-floor platform. The two ports of the movable connecting pipe 3 are respectively connected to the lower port of the first vertical connecting pipe and the upper port of the second vertical connecting pipe 202 through flanges. In order to ensure sealing, a double sealing structure is adopted at the connection of the flange to avoid oil leakage in the oil guide pipe and ensure stable operation of the transformer system.

[0036] During the factory assembly, one end of the movable joint pipe 3 is fully welded with a flange, and the other end is spot welded with a flange. During the on-site assembly, the spot welded flange is removed, and the length of the movable joint pipe 3 is adjusted according to the height dimension between the lower end of the first lower vertical joint pipe 104 and the upper end of the second vertical joint pipe 202. After the length of the movable joint pipe 3 meets the actual installation dimension, the removed flange is fully welded to the new end of the movable joint pipe 3.

[0037] When processing the movable joint pipe 3 in the factory area, the length of the movable joint pipe 3 is set longer. During on-site installation, the part where the movable joint pipe 3 grows out is cut off according to the actual installation size.

[0038] The first connecting pipe includes a first horizontal connecting pipe 101, and the first horizontal connecting pipe 101 extends from the radiator 5 to the first vertical connecting pipe. The port of the first horizontal connecting pipe 101 is connected to the upper port of the first upper vertical connecting pipe 102. A plurality of first supports 7 are arranged along the length direction of the first horizontal connecting pipe 101, and the first horizontal connecting pipe 101 is connected to the first supports 7 through a clamp. The first supports 7 stand on the second-floor platform, and the first supports 7 are used to support the first horizontal connecting pipe 101.

[0039] A plurality of second supports 8 are arranged along the second horizontal connecting pipe 201 , and the second horizontal connecting pipe 201 is connected to the second supports 8 via clamps. The second supports 8 stand on a platform, and the second supports 8 are used to support the second horizontal connecting pipe 201 .

[0040] In the specific embodiment of the utility model, a first rubber shock-absorbing pad is arranged between the first horizontal connecting pipe 101 and the first support 7, and a second rubber shock-absorbing pad is arranged between the second horizontal connecting pipe 201 and the second support 8. The first rubber shock-absorbing pad and the second rubber shock-absorbing pad can both reduce vibration and adjust the position deviation generated during the installation process.

[0041] There are both an oil inlet pipe and an oil return pipe between the radiator 5 and the transformer oil tank 4, so there are at least two oil guide pipes. In the specific embodiment of the utility model, four oil guide pipes are set. One end of two of the oil guide pipes is connected to the two oil ports at the upper part of the radiator 5, and the other end is connected to the two oil ports at the upper part of the transformer oil tank 4. One end of the other two oil guide pipes is connected to the two oil ports at the lower part of the radiator 5, and the other end is connected to the two oil ports at the lower part of the transformer oil tank 4. The first horizontal connecting pipe 101 corresponding to the oil guide pipe connected to the upper oil port of the radiator 5 is higher than the first horizontal connecting pipe 101 corresponding to the oil guide pipe connected to the lower oil port of the radiator 5, and at the same time, the first upper vertical connecting pipe 102 corresponding to the former oil guide pipe is longer than the first upper vertical connecting pipe 102 corresponding to the latter oil guide pipe, so as to ensure that the lower ports of the first upper vertical connecting pipe 102 corresponding to the two oil guide pipes are flush, and are both flush with the bottom surface of the oil guide frame 6.

[0042] The transformer oil tank 4 in the utility model is provided with a high-voltage bushing 10 and a neutral point bushing 12. The utility model is also provided with a current transformer 15, referred to as CT. The CT in the utility model is a built-in CT. Each high-voltage bushing 10 corresponds to a CT. The utility model centrally arranges multiple CTs on the outside of the side pole inside the transformer oil tank 4. The magnetic leakage on the outside of the side pole is less, thereby reducing the interference to the CT. The transformer in the utility model adopts a three-phase five-column frame structure iron core. Among the five columns, three columns are located in the middle, which are the core columns. The remaining two columns are located on the side, which are the side columns. The outside of the side column refers to the side of the side column away from the core column. The built-in CT can significantly reduce the external dimensions of the transformer oil tank 4, thereby further saving floor space. Each high-voltage bushing 10 is connected to the corresponding CT through a wire, and the wires drawn from each CT are centrally connected to the central bushing.

[0043] The transformer oil tank is shielded to better control magnetic leakage and solve the loss problem of large-capacity transformers themselves.

[0044] The transformer tank 4 is also provided with a neutral point grounding system, and the neutral point contact system is used to ground the copper bar led out of the central bushing. The neutral point grounding system in the utility model includes a first insulating support 13 and a second insulating support 14. The first insulating support 13 is connected to the raised seat of the neutral point bushing 12 by bolts. The second insulating support 14 is connected to the shell of the transformer tank 4 by bolts. The copper bar led out of the neutral point bushing 12 is clamped on the first insulating support 13 and the second insulating support 14. The second insulating support 14 can be a plurality of insulating supports arranged in the vertical direction.

[0045] In the prior art, all insulating pillars are connected to an integral frame plate, which is connected to the shell of the transformer oil tank 4, and a plurality of insulating pillars are arranged downward from the neutral sleeve. Since all insulating pillars need to be installed, the size of the frame plate is large, thus increasing the outer dimensions of the transformer oil tank 4. However, in the present invention, the frame plate is abandoned, and the insulating pillars are divided into a first insulating pillar 13 and a second insulating pillar 14. The first insulating pillar 13 is connected to the raised seat of the neutral point bushing 12, and the second insulating pillar 14 is connected to the shell of the transformer oil tank 4. In this way, the outer dimensions of the transformer oil tank 4 are further reduced.

[0046] The high-voltage bushing 10 and the medium-voltage bushing 11 on the transformer oil tank 4 are both oil-SF6 bushings. The installation size of the oil-SF6 bushing is extremely small, thereby further reducing the outer dimensions of the transformer oil tank 4.

[0047] The utility model provides a corrugated oil conservator 9 on the transformer oil tank 4. The corrugated oil conservator 9 is maintenance-free, which is beneficial to the safe and reliable operation of the transformer system, reduces the number and duration of power outages, and meets the continuous power supply in the urban area. In addition, the corrugated oil conservator 9 is provided on the transformer oil tank 4 to reduce the insulating oil pressure in the on-load switch.

[0048] The transformer oil tank 4 in the utility model is also provided with an intelligent pressure releaser 16, which releases the internal pressure when the internal pressure of the transformer increases, thereby ensuring the safe operation of the transformer system.

[0049] The assembly and installation process of the transformer system in the utility model is as follows: assemble the radiator 5 and the transformer oil tank 4 in the factory area. Specifically, assemble the radiator 5 into the oil guide frame 6, connect the two first connecting pipes to the two oil ports at the top of the radiator 5, connect the other two first connecting pipes to the two oil ports at the bottom of the radiator 5, arrange the first support 7, connect the four first horizontal connecting pipes 101 to the first support 7, and ensure that the lower ports of the four first upper vertical connecting pipes 102 are flush with the bottom surface of the oil guide frame 6. Connect the two second connecting pipes to the two oil ports at the top of the transformer oil tank 4, connect the other two second connecting pipes to the two oil ports at the bottom of the transformer oil tank 4, arrange the second support 8, and connect the four second horizontal connecting pipes 201 to the second support 8. A flange is fully welded at one end of the movable connecting pipe 3, and a flange is welded at the other end.

[0050] Transport the assembled radiator 5 and transformer oil tank 4 to the site, hoist the radiator 5 to the second-floor platform, ensure that the lower ports of the four first upper vertical connecting pipes 102 are flush with the tabletop of the second-floor platform, and connect the upper port of the first lower vertical connecting pipe 104 to the lower port of the first upper vertical connecting pipe 102. Move the transformer to the first-floor platform. Measure the size between the upper port of the second vertical connecting pipe 202 and the lower port of the first lower vertical connecting pipe 104, adjust the length of the movable connecting pipe 3 according to the size, and after adjusting in place, fully weld the flange to the new port of the movable connecting pipe 3, and finally connect the upper port of the movable connecting pipe 3 to the lower port of the first lower vertical connecting pipe 104, and connect the lower port of the movable connecting pipe 3 to the upper port of the second vertical connecting pipe 202.

[0051] In the description of this application, it should be noted that the terms "upper", "lower", "vertical", "horizontal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting this application. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An indoor layered transformer system, comprising a transformer oil tank (4) and a radiator (5) arranged in layers, and also comprising an oil guide pipe for connecting the transformer oil tank (4) and the radiator (5), characterized in that: The oil guide pipe comprises a first connecting pipe, a second connecting pipe and a movable connecting pipe (3); the first port of the first connecting pipe is connected to the oil port of the radiator (5), and the second port of the first connecting pipe faces upward or downward; the first port of the second connecting pipe is connected to the oil port of the transformer oil tank (4), and the second port of the second connecting pipe faces downward or upward; the movable connecting pipe (3) is a straight pipe; during on-site installation, the two ports of the movable connecting pipe (3) are respectively connected to the second port of the first connecting pipe and the second port of the second connecting pipe.

2. The indoor layered transformer system according to claim 1, characterized in that: The radiator (5) is located above the transformer oil tank (4). The radiator (5) is arranged in an oil guide frame (6). The first connecting pipe comprises a first vertical connecting pipe, and the first vertical connecting pipe comprises a first upper vertical connecting pipe (102) and a first lower vertical connecting pipe (104). The port connecting the first upper vertical connecting pipe (102) and the first lower vertical connecting pipe (104) is flush with the bottom surface of the oil guide frame (6). The lower port of the first lower vertical connecting pipe (104) is connected to the upper port of the movable connecting pipe (3). The second connecting pipe comprises a second vertical connecting pipe (202). The upper port of the second vertical connecting pipe (202) is connected to the lower port of the movable connecting pipe (3).

3. The indoor layered transformer system according to claim 2, characterized in that: The first lower vertical connecting pipe (104) comprises a vertical corrugated pipe section (103), the second connecting pipe comprises a second horizontal connecting pipe (201) extending from the transformer oil tank (4) toward the second vertical connecting pipe (202), the second horizontal connecting pipe (201) is connected to the lower end of the second vertical connecting pipe (202), and the second horizontal connecting pipe (201) comprises a horizontal corrugated pipe section (203).

4. The indoor layered transformer system according to claim 1, characterized in that: During factory assembly, one end of the movable coupling pipe (3) is fully welded with a flange, and the other end is spot-welded with a flange; during on-site assembly, the spot-welded flange is removed and the length of the movable coupling pipe (3) is adjusted according to the actual installation size. After the adjustment is in place, the removed flange is fully welded to the end of the movable coupling pipe (3).

5. The indoor layered transformer system according to claim 2, characterized in that: The first connecting pipe comprises a first horizontal connecting pipe (101) extending from the radiator (5) toward the first upper vertical connecting pipe (102), a port of the first horizontal connecting pipe (101) is connected to an upper port of the first upper vertical connecting pipe (102), a plurality of first supports (7) are arranged along the first horizontal connecting pipe (101), a bottom surface of the first support (7) is in contact with a platform for supporting the radiator (5), and the first horizontal connecting pipe (101) is connected to the plurality of first supports (7); The second connecting pipe comprises a second horizontal connecting pipe (201) extending from the transformer oil tank (4) toward the second vertical connecting pipe (202), the port of the second horizontal connecting pipe (201) is connected to the lower port of the second vertical connecting pipe (202), a plurality of second supports (8) are arranged along the second horizontal connecting pipe (201), the second horizontal connecting pipe (201) is connected to the plurality of second supports (8), and the bottom surface of the second support (8) is in contact with a platform for supporting the transformer oil tank (4).

6. The indoor layered transformer system according to claim 5, characterized in that: A first rubber shock-absorbing pad is provided between the first horizontal connecting pipe (101) and the first support (7), and a second rubber shock-absorbing pad is provided between the second horizontal connecting pipe (201) and the second support (8).

7. The indoor layered transformer system according to claim 1, characterized in that: There are a plurality of oil guide pipes, each of which is connected to the transformer oil tank (4) and a corresponding oil port on the radiator (5).

8. The indoor layered transformer system according to claim 1, characterized in that: The transformer oil tank (4) is provided with a high-voltage bushing (10) and a neutral point bushing (12); a current transformer (15) is provided inside the transformer oil tank (4); there are a plurality of current transformers (15); the plurality of current transformers (15) are all provided on the outside of a side column; one end of each current transformer (15) is connected to a high-voltage bushing (10) through a wire; and the other ends of all the current transformers (15) are connected to the neutral point bushing (12).

9. The indoor layered transformer system according to claim 1, characterized in that: The transformer oil tank (4) is provided with a neutral point bushing (12) and a neutral point grounding system, the neutral point grounding system comprising a first insulating support (13) and a second insulating support (14), the first insulating support (13) being connected to a raised seat of the neutral point bushing (12) by means of bolts, the second insulating support (14) being connected to a shell of the transformer oil tank (4) by means of bolts, the second insulating support (14) being provided in plurality, and a copper bar led out from the neutral point bushing (12) being clamped on the first insulating support (13) and the second insulating support (14).

10. The indoor layered transformer system according to claim 1, characterized in that: A high-voltage bushing (10) and a medium-voltage bushing (11) are arranged on the transformer oil tank (4); both the high-voltage bushing (10) and the medium-voltage bushing (11) are oil-SF6 bushings.

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