Safety transformer coil structure and transformer thereof

Abstract

The utility model discloses a safety type transformer coil structure and a transformer thereof. The safety type transformer coil structure comprises an inner coil, an outer coil and a plurality of outgoing insulating parts, the outer coil is sleeved outside the inner coil; the upper end and the lower end of the inner coil extend outwards to be provided with coil outlets. The upper end and the lower end of the outer coil extend outwards to be provided with coil outlets. The outgoing head insulating parts are hung at the upper end and the lower end of the inner coil and are arranged outside the coil outgoing head in a blocking manner; and the outgoing head insulating piece is hung at the upper end and the lower end of the outer coil and is arranged outside the coil outgoing head in a blocking manner. According to the structure, the solid insulating paper board is tightly attached to the surface of the electrode for covering to avoid breakdown and discharge in the use process. After covering, the electric field intensity in transformer oil is basically not changed, accumulation of fiber impurities in the oil under any condition can be eliminated, a small semiconductor bridge is further formed, and therefore the short circuit phenomenon of the two electrodes caused by the small bridge is eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a safety transformer coil structure and a transformer thereof. Background Art

[0002] The coils of a transformer are all circular. The outer coil is nested within the inner coil, and the distance between them is the same. Because the inner coil has protrusions at the top and bottom, these protrusions appear convex in the radial direction.

[0003] The distance between the outer coil and the inner coil is reduced. At the same time, due to the existence of a non-uniform electric field, the point where the outer coil protrudes from the inner coil in the existing structure is prone to breakdown and discharge.

[0004] Because the point where the outer coil protrudes from the inner coil is the weakest in insulation performance, even if no breakdown or discharge occurs, local discharge will be stimulated at this point under the action of the electric field strength.

[0005] There is no effective approach to the existing transformer for the partial discharge or breakdown problem caused by this structure.

[0006] The information disclosed in the background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Utility Model Content

[0007] In response to the above technical problems, the present application provides a safe transformer coil structure and a transformer thereof, which ensures the insulation of the transformer coil in this area by covering the end of the inner coil, thereby avoiding breakdown and discharge during the use of the transformer.

[0008] The present application provides a safety transformer coil structure, comprising: an inner coil, an outer coil, and a plurality of protruding insulating members; the outer coil is sleeved outside the inner coil;

[0009] The upper and lower ends of the inner coil extend outwards to provide coil ends;

[0010] The upper and lower ends of the outer coil extend outwards to provide coil ends;

[0011] The outlet insulating parts are hung on the upper and lower ends of the inner coil and are blocked outside the outlet of the coil;

[0012] The outlet insulating piece is hung on the upper and lower ends of the outer coil and is blocked outside the outlet of the coil.

[0013] Preferably, the protruding insulating part includes: an insulating baffle and a hanging rope; the hanging ropes are respectively tied to the upper and lower parts of the inner coil; the hanging ropes are respectively tied to the upper and lower parts of the outer coil; the insulating baffle is hung on the hanging ropes and extends outside the inner and outer coils, and is arranged outside the coil protrusion.

[0014] Preferably, through holes are symmetrically provided at the fixed end of the insulating baffle; and the hanging rope is passed through the through holes.

[0015] Preferably, the insulating baffle is formed by stacking at least three layers of kraft paper.

[0016] Preferably, the width of the insulating baffle is 2 to 3 times the width of the coil protrusion.

[0017] Preferably, the horizontal spacing between the through holes arranged in pairs is 50 to 60 mm.

[0018] Preferably, the insulating baffle is extended outward from the end surfaces of the inner and outer coils by 300 to 500 mm.

[0019] Preferably, the thickness of the kraft paper used is 0.5-1 mm.

[0020] Preferably, the inner coil comprises: an outer paper tube, an inner paper tube; a plurality of struts are arranged on the outer wall of the inner paper tube at intervals along the circumference of the inner paper tube; a coil cake is wound around the outside of the struts outside the inner paper tube; a pad layer is sandwiched between adjacent coil cakes; a coil head is left at the top coil cake; and a coil head is left at the bottom coil cake.

[0021] The outer coil includes: an outer paper tube and an inner paper tube; a plurality of support bars are arranged on the outer wall of the inner paper tube at intervals along the circumference of the inner paper tube; a wire cake is wound around the outside of the support bars outside the inner paper tube; a pad layer is sandwiched between adjacent wire cakes; a coil end is left on the top wire cake; and a coil end is left on the bottom wire cake.

[0022] Another aspect of the present application provides a transformer, comprising: a housing and the safety transformer coil structure as described above; the safety transformer coil structure is accommodated in the housing.

[0023] The beneficial effects of this application include:

[0024] 1) The safety transformer coil structure provided in this application utilizes solid insulating cardboard to tightly cover the electrode surface, preventing breakdown and discharge during use. This covering essentially does not alter the electric field strength in the transformer oil, eliminating any accumulation of fiber impurities in the oil that could form a semiconductor bridge, thereby eliminating the short circuit between the two electrodes caused by this bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of an inner coil or an outer coil in an expanded state in at least one embodiment provided in the present application;

[0026] Figure 2 A schematic top view of an inner coil or an outer coil in at least one embodiment provided in the present application;

[0027] Figure 3This is a schematic diagram of a partially enlarged structure of the coil end of the inner coil or outer coil in at least one embodiment provided in this application. Figure 1 Middle point A;

[0028] Legend:

[0029] Pad 1, outer paper tube 132, support bar 12, binding wire 112, wire cake 121, inner paper tube 131,

[0030] Coil outlet 212 , insulating baffle 211 , hanging rope 21 , through hole 22 . DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in this field, and can be implemented in a variety of common knowledge settings.

[0034] See also Figures 1 to 3 The safety transformer coil structure provided in this application includes an inner coil, an outer coil, and multiple outlet insulators. The outer coil is sheathed around the inner coil, and the inner and outer coils are of equal height. The outlet insulators are positioned outside the coil outlets 212 of the inner and outer coils, respectively, and are positioned to block and insulate the coil outlets 212.

[0035] The inner coil comprises an outer paper tube 132 and an inner paper tube 131. Multiple struts 12 are spaced circumferentially along the outer wall of the inner paper tube 131. The struts 12 extend axially along the inner paper tube 131. Coil coils 121 are wrapped around the struts 12 on the outer side of the inner paper tube 131. Multiple spacers 1 are placed between adjacent coil coils 121. Each spacer 1 is spaced circumferentially along the inner paper tube 131 and placed in the same layer to provide insulation between adjacent coil coils 121. Coil extensions 212 are provided on the top and bottom surfaces of the inner coil.

[0036] The outer coil comprises an outer paper tube 132 and an inner paper tube 131. Multiple struts 12 are spaced along the outer wall of the inner paper tube 131, extending axially along the inner paper tube 131. Coil coils 121 are wrapped around the struts 12 outside the inner paper tube 131. Multiple spacers 1 are placed between adjacent coil coils 121. Each spacer 1 is spaced along the circumference of the inner paper tube 131 and placed in the same layer to provide insulation between adjacent coil coils 121. Coil extensions 212 are provided on the top and bottom surfaces of the outer coil.

[0037] The outlet insulation includes an insulating block 211 and a hanging rope 21. The hanging rope 21 is tied to the ends of the coil outlets 212 of the inner and outer coils. The insulating block 211 is hung on the hanging rope 21. This arrangement prevents discharge or breakdown during use of the coil outlets 212 when the inner and outer coils are close together. The simple structure and small size of the arrangement prevent the overall structure from being affected during transformer assembly, ensuring the transformer's safety.

[0038] In a specific embodiment, a pair of through holes 22 are symmetrically provided at one end of the insulating blocking piece 211 ; the hanging rope 21 is passed through the through holes 22 .

[0039] In one embodiment, the extending end of the insulating block 211 is extended along the coil outlet 212. The length of the insulating block 211 can be adjusted according to the length of the coil outlet 212.

[0040] In a specific embodiment, the diameter of the through hole 22 is 10-20 mm.

[0041] In one embodiment, the insulating barrier 211 is made of kraft paper.

[0042] In one embodiment, the insulating barrier 211 is formed by stacking at least three layers of kraft paper.

[0043] In a specific embodiment, the width of the insulating blocking piece 211 is 2 to 3 times the width of the coil end 212 to ensure shielding and insulation effects.

[0044] In a specific embodiment, the horizontal spacing between the through holes 22 arranged in pairs is 50 to 60 mm to ensure the stress-bearing reliability of the insulating blocking piece 211 and prevent the insulating blocking piece 211 from falling off during use and installation.

[0045] In one embodiment, the insulating barrier 211 extends 300-500 mm beyond the outer coil enclosure. The kraft paper used is 0.5-1 mm thick. This thickness effectively prevents breakdown. This length isolates the area near the inner and outer coil ends 212.

[0046] In a specific embodiment, the transformer coil outlet insulation structure includes: an insulating baffle 211 and a hanging rope 21; specifically, the insulating baffle 211 is made of three 0.5 mm thick kraft papers stacked together, and two φ14 mm through holes 22 are symmetrically opened on one side of the kraft paper. The white cloth tape 2 passes through the through holes 22 on the outlet insulation, and the insulating baffle 211 is tied tightly to the outlet position of the outer paper tube 132 to achieve insulation shielding of the coil outlet 212.

[0047] The installation steps are as follows:

[0048] 1) Make sure the coil meets the conditions for adding protective paper;

[0049] 2) Measure the width d of the coil end 212 and select kraft paper 1 with a width of at least 2d (a batch of kraft paper with a width of 80 mm can be stored for ends with a width less than 40 mm. For other cases, adapt according to the principle);

[0050] 3) Two symmetrical through holes are made at one end of the kraft paper 1, spaced 50 mm apart. A 20 mm wide white cloth tape 2 is passed through the through holes. After the white cloth tape 2 passes through the through holes, the kraft paper 1 is pressed against the outer wall of the outer screen of the inner coil.

[0051] 4) At the upper and lower ends of the outer screen of the inner coil, with the protrusion as the center, extend kraft paper 1 outward from the protrusion until the kraft paper 1 is exposed 300mm outside the screen, and install 3 pieces of 0.5mm thick kraft paper.

[0052] Another aspect of the present application provides a transformer, comprising: the safety transformer coil structure and a shell as described above; the safety transformer coil structure is arranged in the shell.

[0053] The adoption of this structure can avoid breakdown and discharge during use, and especially ensure the safe use of the transformer under the action of electric field strength.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A safety transformer coil structure, characterized in that: include: Inner coil, outer coil, and multiple protruding insulating parts; the outer coil is sleeved outside the inner coil; The upper and lower ends of the inner coil extend outwards to form coil outlets (212); The upper and lower ends of the outer coil extend outwards to form coil outlets (212); The outlet insulating member is hung on the upper and lower ends of the inner coil and is blocked outside the coil outlet (212); The outlet insulating member is hung on the upper and lower ends of the outer coil and is blocked outside the coil outlet (212).

2. The safety transformer coil structure according to claim 1, characterized in that: The outlet insulating member comprises: an insulating blocking piece (211) and a hanging rope (21); the hanging rope (21) is respectively tied to the upper and lower parts of the inner coil; the hanging rope (21) is respectively tied to the upper and lower parts of the outer coil; the insulating blocking piece (211) is hung on the hanging rope (21) and extends outside the inner coil and the outer coil, and is arranged outside the coil outlet (212).

3. The safety transformer coil structure according to claim 2, characterized in that: A through hole (22) is symmetrically provided at the fixed end of the insulating blocking piece (211); the hanging rope (21) is passed through the through hole (22).

4. The safety transformer coil structure according to claim 2, characterized in that: The insulating baffle (211) is formed by stacking at least three layers of kraft paper.

5. The safety transformer coil structure according to claim 2, characterized in that: The width of the insulating baffle (211) is 2 to 3 times the width of the coil outlet (212).

6. The safety transformer coil structure according to claim 3, characterized in that: The horizontal spacing between the through holes (22) arranged in pairs is 50 to 60 mm.

7. The safety transformer coil structure according to claim 3, characterized in that: The insulating blocking piece (211) is extended outwards by 300 to 500 mm from the end surfaces of the inner and outer coils.

8. The safety transformer coil structure according to claim 3, characterized in that: The thickness of the kraft paper used is 0.5 to 1 mm.

9. The safety transformer coil structure according to claim 1, characterized in that: The inner coil comprises: an outer paper tube (132), an inner paper tube (131); a plurality of struts (12) are arranged on the outer wall of the inner paper tube (131) at intervals along the circumference of the inner paper tube (131); a wire cake (121) is wound around the outside of the struts (12) outside the inner paper tube (131); a pad layer is sandwiched between adjacent wire cakes (121); a coil outlet (212) is reserved on the top wire cake; and a coil outlet (212) is reserved on the bottom wire cake. The outer coil comprises: an outer paper tube (132), an inner paper tube (131); a plurality of struts (12) are arranged on the outer wall of the inner paper tube (131) at intervals along the circumference of the inner paper tube (131); a wire cake (121) is wound around the outside of the struts (12) outside the inner paper tube (131); a pad layer is sandwiched between adjacent wire cakes (121); a coil outlet (212) is reserved on the top wire cake; and a coil outlet (212) is reserved on the bottom wire cake.

10. A transformer, characterized in that: include: A housing and a safety transformer coil structure according to any one of claims 1 to 9; The safety transformer coil structure is accommodated in the shell.

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