Transformer for integrated power distribution area

Abstract

The invention belongs to the field of transformer wire outlet structures, and particularly discloses an integrated transformer for a power distribution area, which comprises an oil tank, a three-phase coil arranged in the oil tank, a low-voltage bushing group and a high-voltage bushing group arranged outside the oil tank, and a wire outlet assembly connected with the three-phase coil, the high-voltage bushing comprises an A-phase bushing, a B-phase bushing and a C-phase bushing which are arranged on the oil tank cover, and the structures and the arrangement modes of the A-phase bushing, the B-phase bushing and the C-phase bushing are the same; and a pressure plate is arranged between the A-phase sleeve and the tank cover of the oil tank, the pressure plate is a circular fixing piece with an opening, and the opening of the pressure plate is arranged downwards. According to the invention, the high-voltage outgoing line adopts the plug-in type one-way sleeve, the low-voltage outgoing line adopts the resin casting type dry sleeve, the all-insulation and all-shielding effects are realized, the influence of external pollution conditions is avoided, and the probability of flashover discharge of the line is reduced; risks of personal injury caused by man-made electric shock and faults are reduced, and power supply reliability and operation safety are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer outlet structure, and in particular relates to an integrated transformer for a distribution station area. Background Art

[0002] The integrated distribution area is an integrated design of the distribution transformer and the low-voltage distribution cabinet, which are fixed on the stand as a whole and prefabricated by the factory. It is easy to install and maintain on site, improve the intelligence level of the distribution network, and improve the reliability of power supply and power quality. The main technical features of the transformer used in the integrated distribution area are: the high-voltage outlet line adopts a plug-in cable terminal to lead out from the oil tank cover. Compared with the traditional porcelain bushing, the plug-in cable terminal can be plugged in and out during power outage, which is convenient for maintenance and repair. The plug-in cable terminal is fully insulated and fully shielded, and is not affected by external dirty conditions, which reduces the probability of flashover discharge in the line; reduces the risk of personal injury caused by electric shock and failure, and improves power supply reliability and operation safety. The low-voltage outlet line adopts a resin-cast dry bushing, which is led out from the front wall of the oil tank and connected to the low-voltage distribution cabinet. The dry low-voltage bushing has sufficient mechanical strength and a higher heat resistance level, which can effectively ensure the safe and stable operation of the transformer. The operating handle of the off-excitation voltage tap changer is located on the side wall of the oil tank, which is convenient for switching the tapping gear.

[0003] Traditional transformers for pole-mounted areas use porcelain bushings for inlet and outlet lines to be led out from the box cover, and are connected to the low-voltage distribution cabinet with multi-core cables. The tap-changer operating handle is located above the box cover, and its overall structure is exactly the same as that of conventional transformers. In addition, the external joint of the low-voltage outlet bushing of traditional pole-mounted transformers is a flat plate. When the low-voltage box wall is connected, the copper bar of the distribution cabinet needs to be bent into an L shape and connected to the bushing. The contact surface of the connection is in the horizontal direction. If the copper bar is stressed, the bushing seal is easily damaged, causing oil leakage; the internal joint of the low-voltage outlet bushing of traditional pole-mounted transformers is mostly a guide rod. When connected to the lead terminal, the contact surface is small, which is prone to unreliable connection and local overheating. Summary of the invention

[0004] The invention provides an integrated transformer for a power distribution area, which is used to solve the problem of local overheating caused by unreliable connection of transformer outlet bushings.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: the integrated transformer for distribution area, including: an oil tank, a three-phase coil arranged in the oil tank, a low-voltage bushing group and a high-voltage bushing group arranged outside the oil tank, and an outlet assembly connected to the three-phase coil;

[0006] The high-voltage bushing includes an A-phase bushing, a B-phase bushing and a C-phase bushing arranged on the oil tank cover, and the structures and arrangement methods of the A-phase bushing, the B-phase bushing and the C-phase bushing are the same;

[0007] A pressure plate is arranged between the A-phase bushing and the tank cover of the oil tank. The pressure plate is a circular fixing member provided with an opening, and the opening of the pressure plate is arranged downward.

[0008] In a preferred embodiment of the present invention, an A-phase cable head is arranged outside the A-phase bushing, and the A-phase cable head is plug-in connected to the A-phase bushing; a B-phase cable head is arranged outside the B-phase bushing, and the B-phase cable head is plug-in connected to the B-phase bushing; a C-phase cable head is arranged outside the C-phase bushing, and the C-phase cable head is plug-in connected to 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-voltage bushing group includes a phase a bushing, a phase b bushing, a phase c bushing and an o phase bushing, and the a phase a bushing, the b phase bushing, the c phase bushing and the o phase bushing are all resin-cast dry bushings, and the a phase bushing, the b phase bushing, the c phase bushing and the o phase bushing are arranged on the box 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, and the A-phase coil, the B-phase coil and the C-phase coil have the same outgoing wire assembly; the outgoing wire assembly includes a high-voltage lead assembly connected to the high-voltage outgoing wire end of the three-phase coil and a low-voltage lead assembly connected to the low-voltage outgoing wire end of the three-phase coil;

[0012] The transformer also includes an upper clamping piece arranged on the three-phase coil, and the low-voltage lead assembly is fixed to the upper clamping piece.

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

[0014] The first outlet end of the A-phase coil is provided with a first straight copper bar, and the last outlet end of the A-phase coil is provided with a last straight copper bar, and the first straight copper bar and the last straight copper bar are fixed to the upper clamp by a low-voltage wire clamp;

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

[0016] The terminal straight copper busbar, the o-phase copper busbar, the o-phase connecting 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 comprises a supporting wood, the end of the supporting wood is provided with a through hole, and the a-phase terminal piece is tied and fixed to the o-phase copper busbar by passing a cloth tape through the through hole.

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

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

[0020] In a preferred embodiment of the present invention, it further comprises a voltage regulating tap changer arranged on the side wall of the oil tank, the supporting device comprises a combined fixing member, at least two transverse wire clamps, and a longitudinal wire clamp, and the two transverse wire clamps are arranged in parallel;

[0021] The combined fixing member comprises two parallel flat plates and an L-shaped plate disposed between the two flat plates, the L-shaped plate being provided with at least four first oblong holes, and the flat plate being provided with at least two second oblong holes;

[0022] The longitudinal wire clamp is arranged at one end of the transverse wire clamp close to 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 changer via an A-phase tap lead, and the A-phase tap lead is fixedly arranged with the longitudinal conductor clamp;

[0025] The B-phase coil is connected to the B-phase tap terminal of the voltage regulating tap changer via a B-phase tap lead, and the B-phase tap lead is fixedly arranged with the transverse wire clamp and the longitudinal 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 arranged with the two transverse wire clamps and the longitudinal wire clamp in sequence.

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

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

[0029] The outlet structure of the distribution transformer in the present invention matches the low-voltage distribution cabinet, is fixed on the stand as a whole, and is prefabricated in the factory, which makes on-site installation and maintenance more convenient; the low-voltage outlet bushing is directly connected to the low-voltage distribution cabinet, and no cable transition is required in the middle, which reduces the material cost. The high-voltage outlet adopts a plug-in single-pass bushing, and the low-voltage outlet adopts a resin-cast dry bushing, which is fully insulated and fully shielded, and is not affected by external dirty conditions, reducing the probability of flashover discharge in the line; reducing the risk of personal injury caused by electric shock and failure, and improving power supply reliability and operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the connection between an integrated distribution area transformer and a low-voltage distribution cabinet described in one embodiment of the present invention;

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

[0033] Figure 3 It is a schematic diagram of high voltage leads of a transformer for an integrated distribution station area described in one embodiment of the present invention;

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

[0035] Figure 5 It is a schematic diagram of the connection of three-phase tap leads of a transformer for an integrated distribution station area described in one embodiment of the present invention;

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

[0037] Figure 7 It is a side view of a combined fixing member for an integrated distribution station transformer according to one embodiment of the present invention;

[0038] Figure 8 It is a top view of a combined fixing member for an integrated distribution station transformer according to one embodiment of the present invention;

[0039] Fig. 9This is a schematic diagram from another angle of a high-voltage outlet line assembly of an integrated distribution station transformer described in one embodiment of the present invention;.

[0040] As shown in the figure:

[0041] 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 joint; 301-a phase terminal lug; 302-o phase copper busbar; 303-conductive busbar; 304-support wood; 401-support plate; 4011-L-shaped bent plate; 4012-reinforcement rib; 402-flat wire clamp; 403-fixing plate; 501-combined fixing piece; 5011-L-shaped plate; 5012-flat plate; 5013-first oblong hole; 5014-second oblong hole; 502-horizontal wire clamp; 503-vertical wire clamp. DETAILED DESCRIPTION

[0042] For ease of understanding, the integrated transformer for a distribution station area is described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, 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 the present invention can be understood according to specific circumstances.

[0045] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0046] like Figure 1 As shown, an integrated transformer for a distribution station area includes: an oil tank 10, a three-phase coil arranged in the oil tank 10, a low-voltage bushing group and a high-voltage bushing group arranged outside the oil tank 10, and an outlet assembly connected to the three-phase coil.

[0047] Reference Figure 1 and Figure 2 , the low-voltage bushing group includes a-phase bushing, b-phase bushing, c-phase bushing and o-phase bushing, and a-phase bushing, b-phase bushing, c-phase bushing and o-phase bushing are all resin-cast dry bushings, and a-phase bushing, b-phase bushing, c-phase bushing and o-phase bushing are arranged on the box wall of the oil tank 10. Here, the low-voltage outlet line adopts a resin-cast dry bushing, which is connected to the low-voltage distribution cabinet 20 after being drawn out from the front box wall of the oil tank 10. The dry low-voltage bushing has sufficient mechanical strength and a higher heat resistance level, which can effectively ensure the safe and stable operation of the transformer. In addition, the external joints of the a-phase bushing, the b-phase bushing, the c-phase bushing and the o-phase bushing are shovel-shaped, and the vertical surface of the shovel-shaped joint 202 is provided with a connection hole. The copper busbar 201 of the distribution cabinet does not need to be bent, and is directly connected to the bushing joint in the vertical direction, and the structure is simpler. If the copper busbar is subjected to force, it will not directly act on the bushing sealing surface, and there is no hidden danger of oil leakage. The internal joint of the low-voltage bushing is a conductive bar 303, which is connected to the lead terminal piece on both sides, with a large contact surface and reliable connection to avoid local overheating during operation.

[0048] The outgoing wire components of the A-phase coil, the B-phase coil and the C-phase coil are the same; the outgoing wire components include a high-voltage lead wire component connected to the high-voltage outgoing wire end of the three-phase coil and a low-voltage lead wire component connected to the low-voltage outgoing wire end of the three-phase coil.

[0049] The transformer also includes an upper clamping piece arranged on the three-phase coil, and the low-voltage lead assembly is fixed to the upper clamping piece.

[0050] Combination Figure 1 and Figure 2 The low-voltage lead assembly includes a straight copper busbar, a low-voltage wire clamp, a phase a terminal lug 301, a phase b terminal lug, a phase c terminal lug, an o phase copper busbar 302 and an o phase terminal lug; taking the low-voltage lead assembly of the A phase coil as an example, the first outlet terminal of the A phase coil is provided with a first straight copper busbar, and the last outlet terminal of the A phase coil is provided with a last straight copper busbar, and the first straight copper busbar and the last straight copper busbar are fixed to the upper clamp through the low-voltage wire clamp; the first straight copper busbar, the a phase terminal lug 301 and the a phase bushing are connected in sequence; the last straight copper busbar, the o phase copper busbar 302, the o phase terminal lug and the o phase bushing are connected in sequence.

[0051] Here, specifically, a hole is opened at the end of the first straight copper bar, which is connected to a straight-line lug. The straight-line lug of each phase is divided into two groups, one end of which is connected to the straight copper bar on both sides, and the other end is connected to the corresponding a-phase bushing conductive bar 303 on both sides. The o-phase copper bar 302 includes an o-phase horizontal bar and an o-phase vertical copper bar, which are connected into a star shape with a straight-line o-phase horizontal bar. A hole is opened at the end of the last straight copper bar, which is connected to the low-voltage o-phase bushing after being welded to the o-phase vertical copper bar and the o-phase lug. The o-phase lug is also divided into two groups, one end of which is welded to the o-phase vertical copper bar on both sides, and the other end is connected to the corresponding low-voltage o-phase bushing conductive bar 303 on both sides.

[0052] The low-voltage lead assembly also includes a support wood 304, the end of which is provided with a perforation, and the a-phase wiring piece 301 is tied and fixed by a cloth tape through the perforated o-phase copper bar 302. That is, the longer a-phase wiring piece 301 is tied and fixed with the o-phase horizontal bar in a cross shape by the support wood 304 at an appropriate position, and the support wood 304 is provided with two small holes through which the cloth tape passes.

[0053] like Figure 3 As shown, the high-voltage bushing includes an A-phase bushing, a B-phase bushing and a C-phase bushing which are arranged on the cover of the oil tank 10. The structures and arrangement methods of the A-phase bushing, the B-phase bushing and the C-phase bushing are the same.

[0054] A pressure plate 101 is provided between the A-phase bushing and the tank cover of the oil tank 10. The pressure plate 101 is a circular fixing member provided with an opening, and the opening of the pressure plate 101 is provided downward. An A-phase cable head 102 is provided outside the A-phase bushing, and the A-phase cable head 102 is plug-in connected to the A-phase bushing; a B-phase cable head is provided outside the B-phase bushing, and the B-phase cable head is plug-in connected to the B-phase bushing; a C-phase cable head is provided outside the C-phase bushing, and the C-phase cable head is plug-in connected to the C-phase bushing. The A-phase cable head 102, the B-phase cable head and the C-phase cable head are all elbow-shaped cable heads.

[0055] Here, specifically, taking the A-phase bushing as an example, the high-voltage outlet line is led out from the oil tank 10 cover using a plug-in single-pass bushing, and the bushing pressure plate 101 is installed with a reverse buckle. Compared with the traditional positive-mounted structure of the pressure plate 101, the influence of water accumulation on the bushing seal caused by the pressure plate 101 is eliminated. The single-pass bushing and the elbow-shaped cable head 102 are combined into a cable terminal, which is fully insulated and fully shielded, and is not affected by external dirty conditions, reducing the probability of flashover discharge in the line; reducing the risk of electric shock and personal injury caused by faults, and improving power supply reliability and operational safety.

[0056] The first and last ends of the high-voltage winding and the taps are all led out axially upward. After being connected into a triangle, they are clamped and fixed by the flat-plate wire clamp 402. The A, B, and C phase wires are connected to the plug-in single-pass bushings on the upper part of the box cover. A certain margin should be left for the length of the phase wire.

[0057] Combination Figure 3 and Figure 4 As shown, a plurality of support plates 401 are arranged on the upper clamp, and the high-voltage lead assembly is fixedly connected to the support plate 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, and the plurality of 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.

[0058] Reference Figure 5 As shown, the supporting device comprises 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.

[0059] Reference Figure 6 and Figure 7 As shown, the length of the combined fixing member 501 matches the width of the fuel tank 10, and the combined fixing member 501 includes two parallel flat plates 5012 and an L-shaped plate 5011 disposed between the two flat plates 5012. Figure 7 and Figure 8 As shown, at least four first oblong holes 5013 are provided on the L-shaped plate 5011 for fixing the support plate 401 and the transverse wire clamp 502. Fig. 9 As shown, at least two second oblong holes 5014 are provided on the flat plate 5012 for connecting with the fixing plate 403 on the wall of the oil tank 10, and the longitudinal wire clamp 503 is provided at one end of the transverse wire clamp 502 close to the voltage regulating tap changer 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.

[0060] The integrated distribution substation transformer also includes a voltage-regulating tap-changer 103 disposed on the side wall of the oil tank 10. Here, the operating handle of the transformer off-excitation voltage-regulating tap-changer 103 is arranged on the side wall of the oil tank 10, and the gear switching is safer and more convenient. The lead support device can be standardized and universalized, and is suitable for the lead structure arranged on the side wall of the tap-changer oil tank 10, and can be used as a typical structure in a full range of amorphous alloy distribution transformers in the integrated distribution substation.

[0061] Continue to refer to Figure 5As shown, the A-phase coil is connected to the A-phase tap terminal of the voltage-regulating tap switch 103 through the A-phase tap lead, and the A-phase tap lead is fixed to the longitudinal wire clamp 503. The B-phase coil is connected to the B-phase tap terminal of the voltage-regulating tap switch 103 through the B-phase tap lead, and the B-phase tap lead is fixed to the transverse wire clamp 502 and the longitudinal wire clamp 503 in sequence. The C-phase coil is connected to the C-phase tap terminal of the voltage-regulating tap switch 103 through the C-phase tap lead, and the C-phase tap lead is fixed to another transverse wire clamp 502 and the longitudinal wire clamp 503 in sequence. The B-phase tap lead is fixed to the longitudinal wire clamp 503 through a cloth tape, and the C-phase tap lead is fixed to the longitudinal wire clamp 503 through a cloth tape. Here, specifically, corresponding grooves are provided on the longitudinal wire clamp 503 to place and fix the three-phase tap leads.

[0062] The lead support device is used for binding and fixing the three-phase tap lead on the one hand, and for positioning the transformer body and the oil tank 10 on the other hand. When the transformer is assembled, the transformer body is first put into the box, and the connection between the tap lead and the off-excitation voltage regulating tap changer 103 and the connection between the low-voltage lead assembly and the low-voltage outlet bushing are completed in sequence. Then, the high-voltage outlet bushing is fixed to the upper part of the box cover by means of reverse buckle installation of the pressure plate, and the tail of the bushing is connected to the A, B, and C phase lines, and the box cover is sealed.

[0063] The outlet structure of the distribution transformer in the present invention matches the low-voltage distribution cabinet 20, is fixed on the stand as a whole, and is prefabricated in the factory, which is more convenient for on-site installation and maintenance; the low-voltage outlet bushing is directly connected to the low-voltage distribution cabinet 20, and no cable transition is required in the middle, which reduces the material cost. The high-voltage outlet adopts a plug-in single-pass bushing, and the low-voltage outlet adopts a resin-cast dry bushing, which is fully insulated and fully shielded, and is not affected by external dirty conditions, reducing the probability of flashover discharge in the line; reducing the risk of personal injury caused by electric shock and failure, and improving power supply reliability and operation safety.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transformer for an integrated distribution area, characterized in that: include: An oil tank, a three-phase coil disposed in the oil tank, a low-voltage bushing group and a high-voltage bushing group disposed outside the oil tank, and an outlet assembly connected to the three-phase coil; The high-voltage bushing includes an A-phase bushing, a B-phase bushing and a C-phase bushing arranged on the oil tank cover, and the structures and arrangement methods of the A-phase bushing, the B-phase bushing and the C-phase bushing are the same; A pressure plate is arranged between the A-phase bushing and the tank cover of the oil tank. The pressure plate is a circular fixing member provided with an opening, and the opening of the pressure plate is arranged downward.

2. The integrated transformer for distribution area according to claim 1, characterized in that: An A-phase cable head is arranged outside the A-phase bushing, and the A-phase cable head is connected to the A-phase bushing in a plug-in manner; a B-phase cable head is arranged outside the B-phase bushing, and the B-phase cable head is connected to the B-phase bushing in a plug-in manner; a C-phase cable head is arranged outside the C-phase bushing, and the C-phase cable head is connected to the C-phase bushing in a plug-in manner.

3. The integrated transformer for 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 transformer for distribution area according to claim 1, characterized in that: The low-voltage bushing group includes a phase bushing, a phase bushing, a phase bushing and an o phase bushing, and the a phase bushing, the b phase bushing, the c phase bushing and the o phase bushing are all resin-cast dry bushings. The a phase bushing, the b phase bushing, the c phase bushing and the o phase bushing are arranged on the box wall of the oil tank.

5. The integrated transformer for 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, and the A-phase coil, the B-phase coil and the C-phase coil have the same outgoing wire assembly; the outgoing wire assembly includes a high-voltage lead assembly connected to the high-voltage outgoing wire end of the three-phase coil and a low-voltage lead assembly connected to the low-voltage outgoing wire end of the three-phase coil; The transformer also includes an upper clamping piece arranged on the three-phase coil, and the low-voltage lead assembly is fixed to the upper clamping piece.

6. The integrated transformer for 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 A wiring lug, a phase B wiring lug, a phase C wiring lug, an O phase copper busbar and an O phase wiring lug; The first outlet end of the A-phase coil is provided with a first straight copper bar, and the last outlet end of the A-phase coil is provided with a last straight copper bar, and the first straight copper bar and the last straight copper bar are fixed to the upper clamp by a low-voltage wire clamp; The first straight copper busbar, the a-phase wiring lug and the a-phase bushing are connected in sequence; The terminal straight copper busbar, the o-phase copper busbar, the o-phase connecting piece and the o-phase bushing are connected in sequence.

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

8. The integrated transformer for distribution area according to claim 5, characterized in that: A plurality of support plates are arranged on the upper clamp, 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 as a whole, and a plurality of the support plates are symmetrically arranged along the center of the upper clamp.

9. The integrated transformer for distribution area according to claim 8, characterized in that: It also includes a voltage-regulating tap-changer disposed on the side wall of the oil tank, wherein the supporting device includes a combined fixing member, at least two transverse wire clamps, and a longitudinal wire clamp, and the two transverse wire clamps are disposed in parallel; The combined fixing member comprises two parallel flat plates and an L-shaped plate disposed between the two flat plates, the L-shaped plate being provided with at least four first oblong holes, and the flat plate being provided with at least two second oblong holes; The longitudinal wire clamp is arranged at one end of the transverse wire clamp close to 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. The integrated transformer for 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 changer via an A-phase tap lead, and the A-phase tap lead is fixedly arranged with the longitudinal wire clamp; The B-phase coil is connected to the B-phase tap terminal of the voltage regulating tap changer via a B-phase tap lead, and the B-phase tap lead is fixedly arranged with the transverse wire clamp and the longitudinal 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 arranged with the two transverse wire clamps and the longitudinal wire clamp in sequence.

11. The integrated transformer for distribution area according to claim 10, characterized in that: 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.

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