Distribution transformer based on remote control switch

Abstract

The invention belongs to the field of distribution transformers, and particularly discloses a distribution transformer based on a remote control switch. Comprising an oil tank, a three-phase coil arranged in the oil tank, a tap switch arranged below the three-phase coil, an adjusting knob arranged on the oil tank, a sleeve arranged above the oil tank and a fixing assembly arranged in the oil tank. The three-phase coil comprises an A-phase coil, a B-phase coil and a C-phase coil, and the structures of the A-phase coil, the B-phase coil and the C-phase coil are the same; a plurality of tapping leads are arranged at the wire outlet end of the A-phase coil and are electrically connected with a tapping switch below the A-phase coil; and the tap switch is electrically connected with the adjusting knob through a connecting wire. Compared with a conventional distribution transformer with the same capacity, on the basis that the length and the width of the transformer are not changed, the height is greatly reduced, the size of the transformer is smaller, the size of the transformer is reduced to the maximum extent, and the use amount of steel, transformer oil and copper is smaller.

Description

Technical Field

[0001] The invention belongs to the technical field of distribution transformers, and in particular relates to a distribution transformer based on a remote control switch. Background Art

[0002] In the current 10kV distribution transformer manufacturing industry, the high-voltage side tap changer of the transformer is generally fixed directly on the box cover, and the high-voltage coil is axially protruded, clamped with a wire clamp, and connected to the tap changer. This requires that space for lead clamping and switch assembly be reserved above the clamp, and the height of the low-voltage coil copper bar must also match it, increasing the amount of transformer main materials.

[0003] However, in the prior art, a remote control switch has been introduced. The remote control switch is connected to the tap switch through a connecting line, so that the remote control switch can be set outside the oil tank. In other words, the appearance of the remote control switch now makes it unnecessary to fix the switch on the tank cover, and the gear position can also be adjusted. In addition, in the prior art, taking the A-phase coil as an example, the high-voltage coil of the A-phase coil has a total of 15 layers, and the order of the heads is X6, X4, X2, X3, X5, X7, X, that is, the 14 layers are X6, X4, X2 from bottom to top. X3 can be directly output from the upper part of the 15th layer. In order to enhance the short-circuit resistance, the heads of X2 and X3 are reversed, and X3, X5, X7, and X are output from the lower part of the 15th layer. The high-voltage coil adopts radial outlet, and the radial outlet of the X6, X4, and X2 taps of the second outer layer will occupy the turns of the outermost layer (that is, when the outermost coil is wound, the turns where the taps of the second outer layer are located must be wound away). In addition, the outlet of the outermost layer needs to be insulated, which takes up a certain amount of space. Therefore, if the outermost layer is not full, 5-6 turns must be left. This results in the coil turns not being arranged. The original conventional transformer structure is no longer suitable for this remote control switch, and a low-cost transformer structure that matches it is urgently needed. Summary of the invention

[0004] The present invention provides a distribution transformer based on a remote control switch, which is used to solve the problem that the structure of the current transformer is not suitable for the remote control switch and needs to occupy a large space.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: the distribution transformer based on the remote control switch, which includes: an oil tank, a three-phase coil arranged in the oil tank, a tap switch arranged below the three-phase coil, an adjustment knob arranged on the oil tank, a bushing arranged above the oil tank, and a fixing component arranged inside the oil tank;

[0006] 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 structure;

[0007] The outlet end of the A-phase coil is provided with a plurality of tap leads, and the tap leads are electrically connected to a tap switch below the A-phase coil; the tap switch is electrically connected to the adjusting knob via a connecting line.

[0008] In a preferred embodiment of the present invention, the fixing assembly includes a high-pressure lower clamp and a fixing plate;

[0009] The high-voltage lower clamp is made of channel steel, the fixing plate is fixed on the high-voltage lower clamp, a through hole is provided on the fixing plate, a nut is welded at the through hole, the nut is provided on a side of the fixing plate close to the channel steel, and the tap changer is fixedly connected to the fixing plate by bolts.

[0010] In a preferred embodiment of the present invention, the fixing assembly also includes a high-voltage upper clamp, a low-voltage upper clamp and a steel pull belt, the high-voltage upper clamp is arranged on the high-voltage side of the three-phase coil, and the low-voltage upper clamp is arranged on the low-voltage side of the three-phase coil; one end of the steel pull belt is fixedly connected to the high-voltage upper clamp, and the other end is fixedly connected to the low-voltage upper clamp, the high-voltage upper clamp is arranged parallel to the low-voltage upper clamp, and the steel pull belt is arranged perpendicular to the high-voltage upper clamp and the low-voltage upper clamp.

[0011] In a preferred embodiment of the present invention, a tie insulation is provided between the steel tie strap and the iron yoke of the transformer, and the width of the tie insulation is greater than the width of the tie strap.

[0012] In a preferred embodiment of the present invention, the steel pull belt includes a first connecting section, a first slope section, a horizontal section, a second slope section and a second connecting section. The steel pull belt is axially symmetrical along the central axis of the horizontal section, and the angle between the first connecting section and the first slope section is 132° to 138°.

[0013] In a preferred embodiment of the present invention, the fixing assembly also includes a horizontal lead copper busbar and a low-voltage coil copper busbar, the low-voltage coil copper busbar of the A-phase coil is electrically connected to the A-phase coil, the low-voltage coil copper busbar is electrically connected to the horizontal lead copper busbar, and the horizontal lead copper busbar is electrically connected to the sleeve.

[0014] In a preferred embodiment of the present invention, the low-voltage coil copper busbar includes a first section, a second section perpendicular to the first section, and a third section arranged perpendicular to the second section, the first section and the third section are located on both sides of the second section, and the third section is arranged inside the A-phase coil.

[0015] In a preferred embodiment of the present invention, the fixing assembly includes a high-pressure upper clamp, a low-pressure upper clamp, a high-pressure lower clamp and a low-pressure lower clamp, the high-pressure upper clamp and the high-pressure lower clamp are fixedly connected by a pull screw, and the low-pressure upper clamp and the low-pressure lower clamp are fixedly connected by a pull screw.

[0016] In a preferred embodiment of the present invention, two side screws are fixedly disposed between the high-pressure upper clamping piece and the low-pressure upper clamping piece.

[0017] In a preferred embodiment of the present invention, the branch lead of the A-phase coil includes seven outlet heads, and the seven outlet heads include X6, X4, X2, X3, X5, X7 and X. The A-phase coil includes 15 layers of coils wound sequentially from the inside to the outside, and the 1st to 14th layers are connected end to end in sequence, and the 15th layer is not connected to the other layers. The outlet heads X6, X4 and X2 are arranged on the 14th layer, and the outlet heads X3, X5, X7 and X are arranged on the 15th layer.

[0018] In a preferred embodiment of the present invention, the coil between the outlets X4 and X2 is a tapping section, the coil between the outlets X3 and X5 is a tapping section, and the remaining coils are normal sections; the wire cross-sectional area of ​​the tapping section is smaller than the wire cross-sectional area of ​​the normal section.

[0019] In a preferred embodiment of the present invention, in the A-phase coil, the first and second layers are each wound with 62 turns of coil, the third layer is wound with 63 turns of coil, the fourth to 13th layers are each wound with 64 turns of coil, the 14th layer is wound with 66 turns of coil, and the 15th layer is wound with 61 turns of coil.

[0020] The technical solution provided by the present invention has the following advantages compared with the prior art:

[0021] Compared with a conventional distribution transformer of the same capacity, the structure of the present invention greatly reduces the height without changing the length and width of the transformer, making the transformer smaller in size, and is suitable for some scenarios with height requirements.

[0022] The manufacturing cost is reduced, the switch is designed on the lower clamp, the transformer size is minimized, the amount of steel, transformer oil and copper is reduced, and the material can be effectively saved while ensuring product performance. The reasonable coordination and arrangement between the coil, core and lead wire not only ensures the convenience of the transformer manufacturing process, but also makes the transformer body more compact and more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a front view of a distribution transformer based on a remote control switch described in one embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of a three-phase coil of a distribution transformer based on a remote control switch described in an embodiment of the present invention;

[0026] Figure 3 is a side view of a distribution transformer based on a remote control switch according to an embodiment of the present invention;

[0027] Figure 4 is a top view of a distribution transformer based on a remote control switch according to an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of a high-voltage lower clamp of a distribution transformer based on a remote control switch described in one embodiment of the present invention;

[0029] Figure 6 It is a schematic diagram of assembling a high-voltage lower clamp and a fixing plate of a distribution transformer based on a remote control switch according to an embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of a steel tie band of a distribution transformer based on a remote control switch described in one embodiment of the present invention;

[0031] Figure 8 It is a front view of a low-voltage coil copper bar of a distribution transformer based on a remote control switch described in one embodiment of the present invention;

[0032] Fig. 9 It is a side view of a low-voltage coil copper bar of a distribution transformer based on a remote control switch described in one embodiment of the present invention;

[0033] Fig.10 It is a schematic diagram of the assembly of a horizontal lead copper bar of a distribution transformer based on a remote control switch according to an embodiment of the present invention;

[0034] Fig.11 It is a schematic diagram of the connection of three-phase coils of a distribution transformer based on a remote control switch according to an embodiment of the present invention;

[0035] Fig.12It is a schematic diagram of three-phase coil outgoing lines of a distribution transformer based on a remote control switch described in one embodiment of the present invention;

[0036] Fig.13 It is a schematic diagram of the outgoing line position of the A-phase coil of a distribution transformer based on a remote control switch described in one embodiment of the present invention;

[0037] Fig.14 It is a schematic diagram of the segmented A-phase coil of a distribution transformer based on a remote control switch described in an embodiment of the present invention.

[0038] As shown in the figure:

[0039] 10-Oil tank; 20-Three-phase coil; 201-A phase coil; 2011-Outlet head; 202-B phase coil; 203-C phase coil; 30-Tap changer; 40-Adjusting knob; 50-Bushing; 60-Connecting wire; 701-High voltage lower clamp; 702-Fixed plate; 703-High voltage upper clamp; 704-Low voltage upper clamp; 705-Steel pull belt; 7051 First connecting section; 7052-First slope section; 7053-Horizontal section; 7054-Second slope section; 7055-Second connecting section; 706-Pull belt insulation; 707-Side screw; 708-Pull screw; 709-Horizontal lead copper bar; 710-Low voltage coil copper bar; 7101-First section; 7102-Second section; 7103-Third section. DETAILED DESCRIPTION

[0040] For ease of understanding, a distribution transformer based on a remote control switch 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] like Figure 1 and Figure 2 As shown, a distribution transformer based on a remote control switch includes: an oil tank 10, a three-phase coil 20 arranged in the oil tank 10, a tap switch 30 arranged below the three-phase coil 20, an adjustment knob 40 arranged on the oil tank 10, a bushing arranged above the oil tank 10, and a fixing component arranged inside the oil tank 10.

[0045] The tap switch 30 in the present invention is arranged below the three-phase coil 20, and the adjustment knob 40 is arranged above the oil tank 10, and the two are connected by a connecting line 60, that is, a remote control switch is formed.

[0046] First, combine Figure 3 and Figure 4 As shown, the fixing assembly includes a high-pressure upper clamp 703, a low-pressure upper clamp 704, a high-pressure lower clamp 701 and a low-pressure lower clamp.

[0047] like Figure 1 As shown, the high-pressure upper clamp 703 and the high-pressure lower clamp 701 are fixedly connected by a pull screw 708, and the low-pressure upper clamp 704 and the low-pressure lower clamp are fixedly connected by a pull screw 708. Figure 4 As shown, two side screws 707 are fixedly arranged between the high-pressure upper clamp 703 and the low-pressure upper clamp 704. The high-pressure upper clamp 703, the low-pressure upper clamp 704, the high-pressure lower clamp 701 and the low-pressure lower clamp are fixed to each other by a pull screw 708 or a side screw 707, which increases the rigidity.

[0048] Combination Figure 5 and Figure 6As shown, the fixing assembly also includes a fixing plate 702. The high-voltage lower clamp 701 is made of channel steel, and the fixing plate 702 is fixed on the high-voltage lower clamp 701. The fixing plate 702 is made of 4mm steel plate. A through hole is provided on the fixing plate 702, and a nut is welded at the through hole. The nut is provided on the side of the fixing plate 702 close to the channel steel. The tap changer 30 is fixedly connected to the fixing plate 702 by bolts. During assembly, the bolts can be directly passed through the switch support plate and the fixing plate 702 and screwed into the nuts, without the need for workers to tighten the nuts on the inside. This can solve the installation problem in a narrow space, and can make full use of this part of the space to keep the width of the transformer unchanged.

[0049] Combination Figure 4 As shown, the fixing assembly also includes a high-voltage upper clamp, a low-voltage upper clamp, a steel pull belt 705 and cardboard. The high-voltage upper clamp is arranged on the high-voltage side of the three-phase coil 20, and the low-voltage upper clamp is arranged on the low-voltage side of the three-phase coil 20; one end of the steel pull belt 705 is fixedly connected to the high-voltage upper clamp 703, and the other end is fixedly connected to the low-voltage upper clamp 704. The high-voltage upper clamp 703 is arranged parallel to the low-voltage upper clamp 704, and the steel pull belt 705 is arranged vertically to the high-voltage upper clamp 703 and the low-voltage upper clamp 704.

[0050] A pull-belt insulation 706 is provided between the steel pull-belt 705 and the iron yoke of the transformer, and the width of the pull-belt insulation 706 is greater than that of the pull-belt. The iron yoke clamping structure is provided with the help of the steel pull-belt 705 and the side screw 707. Compared with the conventional semi-dry glass adhesive tape, the steel pull-belt 705 has a better clamping effect and is not easily deformed. The pull-belt insulation 706 is padded between the iron yoke, and the width of the pull-belt insulation 706 is 20mm wider than that of the steel pull-belt 705. If there is still a gap, it can be adjusted with a 1mm cardboard.

[0051] like Figure 7 As shown, the steel pull belt 705 includes a first connecting section 7051, a first slope section 7052, a horizontal section 7053, a second slope section 7054 and a second connecting section 7055. The steel pull belt 705 is symmetrical along the central axis of the horizontal section 7053. The angle between the first horizontal section 7053 and the first slope section 7052 is 132° to 138°. In one embodiment of the present invention, the angle between the first horizontal section 7053 and the first slope section 7052 is 135°. In other words, the steel pull belt 705 in the present invention is designed as an arched structure, which has a higher connection strength and a more stable structure.

[0052] Combination Figure 8 , Fig. 9 and Fig.10 As shown, the fixing assembly also includes a horizontal lead copper bar 709 and a low-voltage coil copper bar 710 , the A-phase coil 201 is electrically connected to the low-voltage coil copper bar 710 , the low-voltage coil copper bar 710 is electrically connected to the horizontal lead copper bar 709 , and the horizontal lead copper bar 709 is electrically connected to the sleeve 50 .

[0053] The low-voltage coil copper bar 710 includes a first section 7101, a second section 7102 perpendicular to the first section 7101, and a third section 7103 perpendicular to the second section 7102. The first section 7101 and the third section 7103 are located on both sides of the second section 7102. The third section 7103 is inserted into the low-voltage side of the A-phase coil 201, so the low-voltage coil copper bar 710 can also be said to be the outlet end of the low-voltage coil.

[0054] Reference Figure 2 Since the three-phase coil 20 includes an A-phase coil 201, a B-phase coil 202, and a C-phase coil 203, the A-phase coil 201, the B-phase coil 202, and the C-phase coil 203 have the same structure. Fig.11 , the A-phase coil 201, the B-phase coil 202 and the C-phase coil 203 are D-connected.

[0055] Taking the A-phase coil 201 as an example, a plurality of tap leads are provided at the outlet end of the A-phase coil 201 , and the tap leads are electrically connected to the tap switch 30 below the A-phase coil 201 ; the tap switch 30 is electrically connected to the adjustment knob 40 via a connecting line 60 .

[0056] Reference Figure 1 As shown, the tapping lead of the A-phase coil 201 includes seven outlet terminals 2011, and the seven outlet terminals 2011 include X6, X4, X2, X3, X5, X7 and X. Fig.12 As shown, the A-phase coil 201 includes 15 layers of coils wound sequentially from the inside to the outside, the 1st to 14th layers are connected end to end in sequence, the 15th layer is not connected to the other layers, the outlet terminals X6, X4 and X2 are arranged on the 14th layer, and the outlet terminals X3, X5, X7 and X are arranged on the 15th layer.

[0057] Reference Fig.13 and Fig.14 As shown, the coil between the outlet terminals X4 and X2 is a tapping section, the coil between the outlet terminals X3 and X5 is a tapping section, and the remaining coils are normal sections; the wire cross-sectional area of ​​the tapping section is smaller than the wire cross-sectional area of ​​the normal section.

[0058] In the A-phase coil 201, the first and second layers are each wound with 62 turns of coil, the third layer is wound with 63 turns of coil, the fourth to 13th layers are each wound with 64 turns of coil, the 14th layer is wound with 66 turns of coil, and the 15th layer is wound with 61 turns of coil.

[0059] Specifically, taking the A-phase coil 201 as an example, the order of the high-voltage coil terminals 2011 of the A-phase coil 201 is X6, X4, X2, X3, X5, X7, X, that is, X6, X4, X2 are output from the 14 layers from bottom to top.

[0060] Specific reference Fig.14 In the present invention, the coil outlet is divided into a normal section and a tapping section. The tapping section uses a wire with a slightly smaller cross-sectional area, so that the 14th layer can be wound with 2 more turns and the 15th layer can be wound with 2 fewer turns. In order not to affect the load loss (the load loss is measured at the rated gear), the 45 turns between X4 and X2 and between X3 and X5 are tapping sections, and the rest are normal sections. In this way, the sub-outer layer can be wound with more turns while meeting the axial size, leaving space for the outermost layer. And the order of high-voltage outlets is consistent with the order of switch joints.

[0061] The present invention generally includes the following steps when manufacturing the lead structure.

[0062] 1. The high-voltage lead wire is pointed downward and tied securely with a binding tape. No wire clamp is required.

[0063] 2. The high-voltage lead wire is a φ2.5 paper-wrapped round copper wire. One end is connected to the coil original wire by welding, and the welding point is wrapped with insulating paper. The other end is cold-pressed to the tap changer 30. Insert the lead wire into the terminal until it reaches half the length of the terminal on the opposite side of the switch, and use cold-pressing pliers to press the point to the limit.

[0064] 3. The connecting wire 60 of the tap changer 30 is tied to the pull screws 708 on the left and right sides, and tied twice up and down on each side to fix it.

[0065] 4. The low-voltage coil copper bar 710 of the low-voltage coil is improved, and the bending is changed from three times to two times, and it is no longer necessary to connect with the low-voltage upper clamp 704. The height is also reduced from the upper part of the low-voltage upper clamp 704 to the lower part of the low-voltage upper clamp 704. The heads of a, b, and c are bolted to the horizontal lead copper bar 709, and then connected to the wiring piece. The tail heads are connected in sequence with the 0-phase copper bar, and the wiring piece is connected directly below the 0-phase bushing 50. Among them, the tail head connection method is bolt connection.

[0066] Compared with a conventional distribution transformer of the same capacity, the structure of the present invention greatly reduces the height without changing the length and width of the transformer, making the transformer smaller in size, and is suitable for some scenarios with height requirements.

[0067] The manufacturing cost is reduced, the switch is designed on the lower clamp, the transformer size is minimized, the amount of steel, transformer oil and copper is reduced, and the material can be effectively saved while ensuring product performance. The reasonable coordination and arrangement between the coil, core and lead wire not only ensures the convenience of the transformer manufacturing process, but also makes the transformer body more compact and more practical.

[0068] 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 distribution transformer based on a remote control switch, characterized in that: include: An oil tank, a three-phase coil disposed in the oil tank, a tap switch disposed below the three-phase coil, an adjustment knob disposed on the oil tank, a sleeve disposed above the oil tank, and a fixing assembly disposed inside the oil tank; 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 structure; The outlet end of the A-phase coil is provided with a plurality of tap leads, and the tap leads are electrically connected to a tap switch below the A-phase coil; the tap switch is electrically connected to the adjusting knob via a connecting line.

2. A distribution transformer based on a remote control switch according to claim 1, characterized in that: The fixing assembly includes a high-pressure lower clamp and a fixing plate; The high-voltage lower clamp is made of channel steel, the fixing plate is fixed on the high-voltage lower clamp, a through hole is provided on the fixing plate, a nut is welded at the through hole, the nut is provided on a side of the fixing plate close to the channel steel, and the tap changer is fixedly connected to the fixing plate by bolts.

3. A distribution transformer based on a remote control switch according to claim 1, characterized in that: The fixing assembly also includes a high-voltage upper clamp, a low-voltage upper clamp and a steel pull belt. The high-voltage upper clamp is arranged on the high-voltage side of the three-phase coil, and the low-voltage upper clamp is arranged on the low-voltage side of the three-phase coil; one end of the steel pull belt is fixedly connected to the high-voltage upper clamp, and the other end is fixedly connected to the low-voltage upper clamp. The high-voltage upper clamp is arranged parallel to the low-voltage upper clamp, and the steel pull belt is arranged perpendicular to the high-voltage upper clamp and the low-voltage upper clamp.

4. A distribution transformer based on a remote control switch according to claim 3, characterized in that: A pull-belt insulation is provided between the steel pull-belt and the iron yoke of the transformer, and the width of the pull-belt insulation is greater than the width of the pull-belt.

5. A distribution transformer based on a remote control switch according to claim 3, characterized in that: The steel pull belt includes a first connecting section, a first slope section, a horizontal section, a second slope section and a second connecting section. The steel pull belt is axially symmetrical along the central axis of the horizontal section. The angle between the first connecting section and the first slope section is 132° to 138°.

6. A distribution transformer based on a remote control switch according to claim 1, characterized in that: The fixing assembly also includes a horizontal lead copper bar and a low-voltage coil copper bar. The low-voltage coil copper bar of the A-phase coil is electrically connected to the A-phase coil, the low-voltage coil copper bar is electrically connected to the horizontal lead copper bar, and the horizontal lead copper bar is electrically connected to the sleeve.

7. A distribution transformer based on a remote control switch according to claim 6, characterized in that: The low-voltage coil copper bar includes a first section, a second section perpendicular to the first section, and a third section arranged perpendicular to the second section. The first section and the third section are located on both sides of the second section, and the third section is arranged inside the A-phase coil.

8. A distribution transformer based on a remote control switch according to claim 1, characterized in that: The fixing assembly includes a high-pressure upper clamp, a low-pressure upper clamp, a high-pressure lower clamp and a low-pressure lower clamp. The high-pressure upper clamp is fixedly connected to the high-pressure lower clamp by a pull screw, and the low-pressure upper clamp is fixedly connected to the low-pressure lower clamp by a pull screw.

9. A distribution transformer based on a remote control switch according to claim 8, characterized in that: Two side screws are fixedly arranged between the high-pressure upper clamping piece and the low-pressure upper clamping piece.

10. A distribution transformer based on a remote control switch according to claim 1, characterized in that: The branch lead of the A-phase coil includes seven outlet heads, which include X6, X4, X2, X3, X5, X7 and X. The A-phase coil includes 15 layers of coils wound sequentially from the inside to the outside, the 1st to 14th layers are connected end to end in sequence, and the 15th layer is not connected to the other layers. The outlet heads X6, X4 and X2 are arranged on the 14th layer, and the outlet heads X3, X5, X7 and X are arranged on the 15th layer.

11. A distribution transformer based on a remote control switch according to claim 10, characterized in that: The coil between the outlet terminals X4 and X2 is a tapping section, the coil between the outlet terminals X3 and X5 is a tapping section, and the remaining coils are normal sections; the wire cross-sectional area of ​​the tapping section is smaller than the wire cross-sectional area of ​​the normal section.

12. A distribution transformer based on a remote control switch according to claim 10, characterized in that: In the A-phase coil, the first and second layers are each wound with 62 turns of coil, the third layer is wound with 63 turns of coil, the fourth to 13th layers are each wound with 64 turns of coil, the 14th layer is wound with 66 turns of coil, and the 15th layer is wound with 61 turns of coil.

Images