Transformer for integrated distribution transformer area

Abstract

The present invention relates to the field of transformer lead exit structures. Specifically disclosed is a transformer for an integrated distribution transformer area, comprising: an oil tank, a three-phase coil arranged in the oil tank, a low-voltage bushing group and a high-voltage bushing group that are arranged outside the oil tank, and a lead exit assembly connected to the three-phase coil. The high-voltage bushing group comprises an A-phase bushing, a B-phase bushing and a C-phase bushing which are arranged on a tank cover of the oil tank, and the structures and arrangement modes of the A-phase bushing, the B-phase bushing and the C-phase bushing are the same; and a pressure disc is arranged between the A-phase bushing and the tank cover of the oil tank, the pressure disc is a circular fixing member provided with an opening, and the opening of the pressure disc is arranged downwards. In the present invention, a pluggable single-pass bushing is used for high voltage lead exit, and a cast-resin dry type bushing is used for lower voltage lead exit, full insulating and full shielding are achieved, the influence of external pollution conditions is avoided, and the probability of flashover discharge on a line is reduced; and the risk of personal injury caused by human electric shock and failures is reduced, and the power supply reliability and operation safety are improved.

Description

An integrated transformer for distribution substations Technical Field

[0001] This invention belongs to the technical field of transformer outgoing line structure, specifically relating to an integrated distribution transformer for substations. Background Technology

[0002] Integrated distribution transformer substations integrate distribution transformers and low-voltage switchgear into a single design, fixed to a frame and prefabricated in the factory. This facilitates on-site installation and maintenance, improves the intelligence level of the distribution network, and enhances power supply reliability and quality. The main technical features of the transformers used in integrated distribution transformer substations are: high-voltage outgoing lines utilize pluggable cable terminals leading from the tank cover. Compared to traditional porcelain bushings, pluggable cable terminals allow for plugging and unplugging during power outages, facilitating maintenance. The pluggable cable terminals are fully insulated and shielded, unaffected by external pollution conditions, reducing the probability of flashover discharge and minimizing the risk of electric shock or personal injury during faults, thus improving power supply reliability and operational safety. Low-voltage outgoing lines use resin-cast dry bushings, leading from the front wall of the tank and connecting to the low-voltage switchgear. These dry-type low-voltage bushings possess sufficient mechanical strength and higher heat resistance, effectively ensuring the safe and stable operation of the transformer. The de-energized tap changer control handle is located on the side wall of the tank for easy switching of tap positions.

[0003] Traditional pole-mounted transformers typically use porcelain bushings to lead in and out of the enclosure, connecting to the low-voltage distribution cabinet via multi-core cables. The tap changer operating handle is located above the enclosure, and its overall structure is identical to that of a conventional transformer. Furthermore, the external connectors of the low-voltage outgoing bushings in traditional pole-mounted transformers are flat. When a line exits from the low-voltage enclosure wall, the copper busbar of the distribution cabinet needs to be bent into an L-shape to connect with the bushing. Since the contact surface is horizontal, if the copper busbar is under stress, the bushing seal is easily damaged, causing oil leakage. Internal connectors of the low-voltage outgoing bushings in traditional pole-mounted transformers are often guide rods. When connecting to the lead wire terminals, the contact surface is small, making unreliable connections prone to causing localized overheating. Summary of the Invention

[0004] This invention provides an integrated transformer for distribution substations to solve the problem of localized overheating caused by unreliable bushing connections in current transformers.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: an integrated distribution transformer for substations, comprising: an oil tank, a three-phase coil disposed inside the oil tank, a low-voltage bushing assembly and a high-voltage bushing assembly disposed outside the oil tank, and an outgoing line assembly connected to the three-phase coil;

[0006] The high-pressure bushing includes an A-phase bushing, a B-phase bushing, and a C-phase bushing disposed on the tank cover. The A-phase bushing, the B-phase bushing, and the C-phase bushing have the same structure and arrangement.

[0007] A pressure plate is provided between the A-phase bushing and the tank cover of the oil tank. The pressure plate is a circular fixing component with an opening facing downwards.

[0008] In a preferred embodiment of the present invention, an A-phase cable head is provided on the outside of the A-phase bushing, and the A-phase cable head is plugged into the A-phase bushing; a B-phase cable head is provided on the outside of the B-phase bushing, and the B-phase cable head is plugged into the B-phase bushing; a C-phase cable head is provided on the outside of the C-phase bushing, and the C-phase cable head is plugged into the C-phase bushing.

[0009] In a preferred embodiment of the present invention, the A-phase cable head, the B-phase cable head, and the C-phase cable head are all elbow-shaped cable heads.

[0010] In a preferred embodiment of the present invention, the low-pressure bushing assembly includes an a-phase bushing, a b-phase bushing, a c-phase bushing, and an o-phase bushing. The a-phase bushing, b-phase bushing, c-phase bushing, and o-phase bushing are all resin-cast dry bushings, and the a-phase bushing, b-phase bushing, c-phase bushing, and o-phase bushing are disposed on the tank wall of the oil tank.

[0011] In a preferred embodiment of the present invention, the three-phase coil includes an A-phase coil, a B-phase coil, and a C-phase coil, wherein the output components of the A-phase coil, the B-phase coil, and the C-phase coil are identical; the output components include a high-voltage lead assembly connected to the high-voltage output terminal of the three-phase coil and a low-voltage lead assembly connected to the low-voltage output terminal of the three-phase coil.

[0012] The transformer also includes an upper clamp disposed on the three-phase coils, and the low-voltage lead assembly is fixed to the upper clamp.

[0013] In a preferred embodiment of the present invention, the low-voltage lead assembly includes a straight copper busbar, a low-voltage conductor clamp, an a-phase connector, a b-phase connector, a c-phase connector, an o-phase copper busbar, and an o-phase connector.

[0014] The first output terminal of the A-phase coil is provided with a first straight copper busbar, and the last output terminal of the A-phase coil is provided with a last straight copper busbar. The first straight copper busbar and the last straight copper busbar are fixed to the upper clamp by a low-voltage wire clamp.

[0015] The first-end straight copper busbar, the a-phase connector, and the a-phase bushing are connected in sequence;

[0016] The terminal straight copper busbar, the O-phase copper busbar, the O-phase terminal piece, and the O-phase bushing are connected in sequence.

[0017] In a preferred embodiment of the present invention, the low-voltage lead assembly further includes a support wood, the end of which is provided with a through hole, and the a-phase connector is bound and fixed to the o-phase copper busbar by passing through the through hole with a cloth tape.

[0018] In a preferred embodiment of the present invention, the upper clamp is provided with a plurality of support plates, and the high voltage lead assembly is fixedly connected to the support plates through a support device;

[0019] The support plate includes an L-shaped bent plate and a reinforcing rib welded to the L-shaped bent plate. Multiple support plates are symmetrically arranged along the center of the upper clamp.

[0020] In a preferred embodiment of the present invention, a pressure regulating tap switch is further provided on the side wall of the oil tank. The support device includes a combined fixing member, at least two transverse wire clamps, and a longitudinal wire clamp, wherein the two transverse wire clamps are arranged in parallel.

[0021] The combined fastener includes two parallel flat plates and an L-shaped plate disposed between the two flat plates. The L-shaped plate is provided with at least four first elongated holes, and the flat plates are provided with at least two second elongated holes.

[0022] The longitudinal wire clamp is disposed at one end of the transverse wire clamp near the voltage regulating tap changer;

[0023] One end of the transverse wire clamp is fixedly connected to the L-shaped plate, and the other end of the transverse wire clamp is fixedly connected to the longitudinal wire clamp.

[0024] In a preferred embodiment of the present invention, the A-phase coil is connected to the A-phase tap terminal of the voltage regulating tap switch via an A-phase tap lead, and the A-phase tap lead is fixedly installed with the longitudinal conductor clamp.

[0025] The B-phase coil is connected to the B-phase tap terminal of the voltage regulating tap switch via the B-phase tap lead, and the B-phase tap lead is fixedly installed to the horizontal wire clamp and the vertical wire clamp in sequence.

[0026] The C-phase coil is connected to the C-phase tap terminal of the voltage regulating tap switch via a C-phase tap lead, and the C-phase tap lead is fixedly connected to two horizontal wire clamps and a vertical wire clamp in sequence.

[0027] In a preferred embodiment of the present invention, the A-phase tap lead is fixed to the longitudinal conductor clamp by a cloth tape, the B-phase tap lead is fixed to the longitudinal conductor clamp by a cloth tape, and the C-phase tap lead is fixed to the longitudinal conductor clamp by a cloth tape.

[0028] The technical solution provided by this invention has the following advantages compared with the prior art:

[0029] In this invention, the outgoing line structure of the distribution transformer is matched with the low-voltage distribution cabinet, and the entire assembly is fixed on a platform. It is prefabricated in the factory, making on-site installation and maintenance more convenient. The low-voltage outgoing line bushings are directly connected to the low-voltage distribution cabinet, eliminating the need for intermediate cables and reducing material costs. High-voltage outgoing lines use pluggable single-pass bushings, while low-voltage outgoing lines use resin-cast dry bushings, providing full insulation and shielding, unaffected by external pollution conditions, reducing the probability of flashover discharge; reducing the risk of electric shock and personal injury during faults, and improving power supply reliability and operational safety. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0031] Figure 1 is a schematic diagram of the connection between an integrated power distribution area transformer and a low-voltage distribution cabinet according to an embodiment of the present invention.

[0032] Figure 2 is a schematic diagram of an integrated distribution substation transformer low-voltage lead assembly according to an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of a high-voltage lead of an integrated distribution transformer for a distribution area according to an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of a support plate for an integrated distribution transformer area according to an embodiment of the present invention;

[0035] Figure 5 is a schematic diagram of the three-phase tap connection of an integrated distribution transformer for a distribution area according to an embodiment of the present invention.

[0036] Figure 6 is a front view of a combined fixing component for an integrated distribution transformer area according to an embodiment of the present invention;

[0037] Figure 7 is a side view of an integrated transformer combination fixing component for a distribution substation according to an embodiment of the present invention.

[0038] Figure 8 is a top view of an integrated transformer combination fixing component for a power distribution area according to an embodiment of the present invention;

[0039] Figure 9 is a schematic diagram from another angle of an integrated distribution substation transformer high-voltage outgoing line assembly according to an embodiment of the present invention.

[0040] The diagram shows: 10-oil tank; 101-pressure plate; 102-cable head; 103-voltage regulating tap changer; 20-distribution cabinet; 201-distribution cabinet copper busbar; 202-shovel-shaped connector; 301-phase A terminal block; 302-phase O copper busbar; 303-conductive busbar; 304-support wood; 401-support plate; 4011-L-shaped bend plate; 4012-reinforcing rib; 402-flat wire clamp; 403-fixing plate; 501-combination fixing component; 5011-L-shaped plate; 5012-flat plate; 5013-first elongated hole; 5014-second elongated hole; 502-transverse wire clamp; 503-longitudinal wire clamp. Detailed Implementation

[0041] For ease of understanding, the following embodiments illustrate an integrated distribution transformer for a distribution area. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation and positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0045] As shown in Figure 1, an integrated distribution transformer for a distribution area includes: an oil tank 10, a three-phase coil disposed inside the oil tank 10, a low-voltage bushing assembly and a high-voltage bushing assembly disposed outside the oil tank 10, and an outgoing line assembly connected to the three-phase coil.

[0046] Referring to Figures 1 and 2, the low-voltage bushing assembly includes phase A, phase B, phase C, and phase O bushings. All phase A, B, C, and O bushings are resin-cast dry-type bushings, installed on the wall of the tank 10. Here, the low-voltage outgoing line uses resin-cast dry-type bushings, leading out from the front wall of the tank 10 and connecting to the low-voltage distribution cabinet 20. The dry-type low-voltage bushings have sufficient mechanical strength and a higher heat resistance rating, effectively ensuring the safe and stable operation of the transformer. Furthermore, the external joints of the phase A, B, C, and O bushings are shovel-shaped, with connection holes on the vertical surface of the shovel-shaped joint 202. The copper busbar 201 of the distribution cabinet does not need to be bent and connects directly to the bushing joint in the vertical direction, simplifying the structure. If the copper busbar is under stress, it will not directly act on the bushing sealing surface, eliminating the risk of oil leakage. The internal connector of the low-pressure bushing is a 303 conductive bar, which is connected to the lead wire terminal on both sides. It has a large contact surface, reliable connection, and avoids local overheating during operation.

[0047] The outgoing wire assemblies of phase A, phase B, and phase C are the same; the outgoing wire assemblies include high-voltage lead assemblies connected to the high-voltage outgoing terminals of the three-phase coils and low-voltage lead assemblies connected to the low-voltage outgoing terminals of the three-phase coils.

[0048] The transformer also includes an upper clamp set on the three-phase coils, and the low-voltage lead assembly is fixed to the upper clamp.

[0049] Referring to Figures 1 and 2, the low-voltage lead assembly includes a straight copper busbar, a low-voltage wire clamp, a-phase connector 301, a b-phase connector, a c-phase connector, an o-phase copper busbar 302, and an o-phase connector. Taking the low-voltage lead assembly of the A-phase coil as an example, the first output end of the A-phase coil is provided with a first-phase straight copper busbar, and the last output end of the A-phase coil is provided with a last-phase straight copper busbar. The first-phase straight copper busbar and the last-phase straight copper busbar are fixed to the upper clamp by the low-voltage wire clamp. The first-phase straight copper busbar, the a-phase connector 301, and the a-phase sleeve are connected in sequence. The last-phase straight copper busbar, the o-phase copper busbar 302, the o-phase connector, and the o-phase sleeve are connected in sequence.

[0050] Specifically, the first straight copper busbar has an opening at its end for connection to a straight connector. Each phase's straight connector is divided into two groups, one end of which is connected to the straight copper busbar on both sides, and the other end is connected to the corresponding phase A bushing conductor 303 on both sides. The phase O copper busbar 302 includes a phase O horizontal busbar and a phase O vertical busbar, which are connected in a star shape using straight phase O horizontal busbars. The last straight copper busbar has an opening at its end, and is connected to the low-voltage phase O bushing after being welded to the phase O vertical busbar and the phase O connector. The phase O connector is also divided into two groups, one end of which is welded to the phase O vertical busbar on both sides, and the other end is connected to the corresponding low-voltage phase O bushing conductor 303 on both sides.

[0051] The low-voltage lead assembly also includes a support piece 304. The end of the support piece 304 has a through hole. The phase A connector 301 is secured by a cloth strip passing through the through hole and binding it to the phase O copper busbar 302. In other words, the longer phase A connector 301 is secured to the phase O horizontally via the support piece 304 at an appropriate position using a cross-shaped cloth strip binding. The support piece 304 has two small holes through which the cloth strip passes.

[0052] As shown in Figure 3, the high-voltage bushing includes an A-phase bushing, a B-phase bushing, and a C-phase bushing installed on the tank cover of the oil tank 10. The A-phase bushing, B-phase bushing, and C-phase bushing have the same structure and installation method.

[0053] A pressure plate 101 is installed between the A-phase bushing and the cover of the tank 10. The pressure plate 101 is a circular fixing component with an opening facing downwards. An A-phase cable head 102 is installed on the outside of the A-phase bushing, and the A-phase cable head 102 is plugged into the A-phase bushing. A B-phase cable head is installed on the outside of the B-phase bushing, and the B-phase cable head is plugged into the B-phase bushing. A C-phase cable head is installed on the outside of the C-phase bushing, and the C-phase cable head is plugged into the C-phase bushing. All A-phase cable heads 102, B-phase cable heads, and C-phase cable heads are elbow-shaped cable heads.

[0054] Specifically, taking the A-phase bushing as an example, the high-voltage outgoing line uses a pluggable single-through bushing led out from the tank cover of tank 10, and the bushing pressure plate 101 is installed with a reverse snap. Compared with the traditional upright installation structure of pressure plate 101, this eliminates the impact of water accumulation on the bushing seal. The single-through bushing and the elbow-shaped cable head 102 combine to form a cable terminal, which is fully insulated and fully shielded, unaffected by external pollution conditions, reducing the probability of flashover discharge in the line; reducing the risk of personal injury caused by electric shock or faults, and improving power supply reliability and operational safety.

[0055] The start, end, and tap of the high-voltage winding are all axially led out and connected in a triangle. They are then clamped and fixed by a flat wire clamp 402. Phase lines A, B, and C are connected to the plug-in single-pass bushing on the top of the box cover. A certain margin should be left for the length of the phase lines.

[0056] As shown in Figures 3 and 4, the upper clamp is provided with multiple support plates 401, and the high voltage lead assembly is fixedly connected to the support plates 401 through a support device. The support plate 401 includes an L-shaped bent plate 4011 and a reinforcing rib 4012 integrally formed with the L-shaped bent plate 4011. The multiple support plates 401 are symmetrically arranged along the center of the upper clamp to ensure that the lead support device is subjected to balanced force.

[0057] Referring to Figure 5, the support device includes a combined fixing member 501, at least two transverse wire clamps 502, and a longitudinal wire clamp 503. The two transverse wire clamps 502 are arranged in parallel.

[0058] Referring to Figures 6 and 7, the length of the combined fastener 501 matches the width of the oil tank 10. The combined fastener 501 includes two parallel flat plates 5012 and an L-shaped plate 5011 disposed between the two flat plates 5012. Referring to Figures 7 and 8, the L-shaped plate 5011 is provided with at least four first elongated holes 5013 for fixing the support plate 401 and the transverse wire clamp 502. Referring to Figure 9, the flat plate 5012 is provided with at least two second elongated holes 5014 for connecting to the fixing plate 403 on the wall of the oil tank 10. The longitudinal wire clamp 503 is disposed at the end of the transverse wire clamp 502 near the voltage regulating tap switch 103; one end of the transverse wire clamp 502 is fixedly connected to the L-shaped plate 5011, and the other end of the transverse wire clamp 502 is fixedly connected to the longitudinal wire clamp 503.

[0059] This integrated distribution transformer also includes a tap changer 103 disposed on the side wall of the tank 10. Here, the operating handle of the transformer's de-energized tap changer 103 is located on the side wall of the tank 10, making tap switching safer and more convenient. The lead support device is standardized and universal, suitable for lead structures disposed on the side wall of the tap changer tank 10, and can be used as a typical structure in a full range of amorphous alloy distribution transformers in integrated distribution transformer areas.

[0060] Referring again to Figure 5, the A-phase coil is connected to the A-phase tap terminal of the voltage regulating tap changer 103 via the A-phase tap lead, which is fixedly mounted to the longitudinal conductor clamp 503. The B-phase coil is connected to the B-phase tap terminal of the voltage regulating tap changer 103 via the B-phase tap lead, which is fixedly mounted to the transverse conductor clamp 502 and the longitudinal conductor clamp 503 in sequence. The C-phase coil is connected to the C-phase tap terminal of the voltage regulating tap changer 103 via the C-phase tap lead, which is fixedly mounted to another transverse conductor clamp 502 and the longitudinal conductor clamp 503 in sequence. The B-phase tap lead and the C-phase tap lead are fixed to the longitudinal conductor clamp 503 with a cloth tape. Specifically, the longitudinal conductor clamp 503 has corresponding grooves to place and fix the three-phase tap leads.

[0061] The lead wire support device is used for both binding and fixing the three-phase tap leads and for positioning between the transformer body and the tank 10. During the final assembly of the transformer, the transformer body is first placed into the tank, and the connection between the tap leads and the off-grid tap changer 103, and the connection between the low-voltage lead assembly and the low-voltage outgoing bushing are completed in sequence. Then, the high-voltage outgoing bushing is fixed to the upper part of the tank cover by using a pressure plate reverse buckle installation method. After the tail of the bushing is connected to the A, B, and C phase lines, the tank cover is sealed.

[0062] In this invention, the outgoing line structure of the distribution transformer matches the low-voltage distribution cabinet 20, and is fixedly mounted on a frame. It is prefabricated in the factory, making on-site installation and maintenance more convenient. The low-voltage outgoing bushings are directly connected to the low-voltage distribution cabinet 20, eliminating the need for intermediate cables and reducing material costs. High-voltage outgoing lines use pluggable single-pass bushings, while low-voltage outgoing lines use resin-cast dry bushings, providing full insulation and shielding, unaffected by external pollution conditions, reducing the probability of flashover discharge; reducing the risk of electric shock and personal injury during faults, and improving power supply reliability and operational safety.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated distribution transformer for a power distribution area, characterized in that, include: An oil tank, a three-phase coil disposed inside the oil tank, a low-voltage bushing assembly and a high-voltage bushing assembly disposed outside the oil tank, and an outgoing line assembly connected to the three-phase coil; The high-pressure bushing includes an A-phase bushing, a B-phase bushing, and a C-phase bushing disposed on the tank cover. The A-phase bushing, the B-phase bushing, and the C-phase bushing have the same structure and arrangement. A pressure plate is provided between the A-phase bushing and the tank cover of the oil tank. The pressure plate is a circular fixing component with an opening facing downwards.

2. The integrated distribution transformer for a power distribution area according to claim 1, characterized in that: The A-phase bushing has an A-phase cable head on its exterior, and the A-phase cable head is plugged into the A-phase bushing. The B-phase bushing has a B-phase cable head on its exterior, and the B-phase cable head is plugged into the B-phase bushing. The C-phase bushing has a C-phase cable head on its exterior, and the C-phase cable head is plugged into the C-phase bushing.

3. The integrated distribution transformer for a power distribution area according to claim 2, characterized in that: The A-phase cable head, the B-phase cable head, and the C-phase cable head are all elbow-shaped cable heads.

4. The integrated distribution transformer for a power distribution area according to claim 1, characterized in that: The low-pressure bushing assembly includes an a-phase bushing, a b-phase bushing, a c-phase bushing, and an o-phase bushing. All a-phase bushings, b-phase bushings, c-phase bushings, and o-phase bushings are resin-cast dry bushings. The a-phase bushing, b-phase bushing, c-phase bushing, and o-phase bushing are installed on the tank wall of the oil tank.

5. The integrated distribution transformer for a power distribution area according to claim 4, characterized in that: The three-phase coil includes an A-phase coil, a B-phase coil, and a C-phase coil. The output components of the A-phase coil, the B-phase coil, and the C-phase coil are the same. The output components include a high-voltage lead assembly connected to the high-voltage output terminal of the three-phase coil and a low-voltage lead assembly connected to the low-voltage output terminal of the three-phase coil. The transformer also includes an upper clamp disposed on the three-phase coils, and the low-voltage lead assembly is fixed to the upper clamp.

6. The integrated distribution transformer for a power distribution area according to claim 5, characterized in that: The low-voltage lead assembly includes a straight copper busbar, a low-voltage wire clamp, a-phase connector, a-phase connector, a-phase connector, a-phase connector, a-phase connector, an o-phase copper busbar, and an o-phase connector. The first output terminal of the A-phase coil is provided with a first straight copper busbar, and the last output terminal of the A-phase coil is provided with a last straight copper busbar. The first straight copper busbar and the last straight copper busbar are fixed to the upper clamp by a low-voltage wire clamp. The first-end straight copper busbar, the a-phase connector, and the a-phase bushing are connected in sequence; The terminal straight copper busbar, the O-phase copper busbar, the O-phase terminal piece, and the O-phase bushing are connected in sequence.

7. The integrated distribution transformer for a power distribution area according to claim 6, characterized in that: The low-voltage lead assembly also includes a support wood, the end of which is provided with a through hole, and the a-phase connector is tied and fixed to the o-phase copper busbar by passing through the through hole with a cloth tape.

8. The integrated distribution transformer for a power distribution area according to claim 5, characterized in that: The upper clamp is provided with multiple support plates, and the high voltage lead assembly is fixedly connected to the support plates through a support device; The support plate includes an L-shaped bent plate and a reinforcing rib welded to the L-shaped bent plate. Multiple support plates are symmetrically arranged along the center of the upper clamp.

9. The integrated distribution transformer for a power distribution area according to claim 8, characterized in that: It also includes a pressure regulating tap switch disposed on the side wall of the oil tank, and the support device includes a combined fixing component, at least two transverse wire clamps, and a longitudinal wire clamp, with the two transverse wire clamps arranged in parallel. The combined fastener includes two parallel flat plates and an L-shaped plate disposed between the two flat plates. The L-shaped plate is provided with at least four first elongated holes, and the flat plates are provided with at least two second elongated holes. The longitudinal wire clamp is disposed at one end of the transverse wire clamp near the voltage regulating tap changer; One end of the transverse wire clamp is fixedly connected to the L-shaped plate, and the other end of the transverse wire clamp is fixedly connected to the longitudinal wire clamp.

10. An integrated distribution transformer for a distribution area according to claim 9, characterized in that: The A-phase coil is connected to the A-phase tap terminal of the voltage regulating tap switch via the A-phase tap lead, and the A-phase tap lead is fixedly installed with the longitudinal conductor clamp; The B-phase coil is connected to the B-phase tap terminal of the voltage regulating tap switch via the B-phase tap lead, and the B-phase tap lead is fixedly installed to the horizontal wire clamp and the vertical wire clamp in sequence. The C-phase coil is connected to the C-phase tap terminal of the voltage regulating tap switch via a C-phase tap lead, and the C-phase tap lead is fixedly connected to two horizontal wire clamps and a vertical wire clamp in sequence.

11. An integrated distribution transformer for a distribution area according to claim 10, characterized in that: The A-phase tap lead is fixed to the longitudinal conductor clamp with a cloth tape, the B-phase tap lead is fixed to the longitudinal conductor clamp with a cloth tape, and the C-phase tap lead is fixed to the longitudinal conductor clamp with a cloth tape.

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