A wrapping method for reducing noise and preventing fragmentation of an amorphous transformer core

Abstract

The application is a kind of noise reduction and fragment prevention wrapping method for amorphous transformer core, which uses point adhesive paper to wrap from inside to outside of the core joint, can be stacked and wrapped several layers, uses staggered layer coating to make the core joint completely wrapped tightly, the structure features are that the shell type transformer winding is inside, the core is wrapped outside the winding, after the core is inserted into the winding, the lower yoke needs to be closed and lapped to achieve magnetic circuit closed circulation, which greatly reduces the outflow of debris; the wrapping of point adhesive paper is left-right alternating and stacked wrapping, when the noise propagates, the propagation path is increased, using this wrapping method can effectively isolate the noise transmitted outward.

Description

Technical Field

[0001] This invention relates to the field of power transformer manufacturing technology, and more specifically, to a method for reducing noise and preventing debris from encasing the core of an amorphous transformer. Background Technology

[0002] Guided by the technological development trend of high-efficiency and energy-saving distribution transformer equipment, amorphous alloy transformers have become a hot spot in the transformer market. Compared with silicon steel transformers, amorphous transformers reduce no-load loss and no-load current by about 50%, significantly improving energy efficiency.

[0003] Amorphous alloy cores are highly sensitive to mechanical stress. The transformer manufacturing process and assembly techniques can all affect the transformer's quality, performance, and stability. For amorphous transformers, the joints of the amorphous core are the most prone to debris leakage. These amorphous debris fragments have sharp edges, which can affect the winding insulation performance. Simultaneously, the amorphous core vibrates during transformer operation, leading to core lamination breakage and fragmentation. These fragments are conductive; if not effectively protected, they can leak with the transformer oil and, if they flow into the windings, cause discharge and lead to accidents. While existing noise reduction technologies exist, their effectiveness is limited.

[0004] For example, Chinese utility model patent CN 205140697 U discloses a novel "1"-shaped pull plate structure three-column amorphous iron core, including an amorphous iron core body, pull plates, and a bottom clamp. The pull plates are in a "1" shape, and three pull plates are provided. The pull plates and the bottom clamp are interlocked to form clamps, which are located on both sides of the amorphous iron core body. The pull plates and the amorphous iron core body are integrally cast with high-strength adhesive. The inner and outer surfaces of the amorphous iron core body are covered with sound-absorbing material, and an insulating plate is provided between the sound-absorbing material on the outer surface of the amorphous iron core body and the clamps. This utility model can generate good economic benefits in practice, effectively solving the problems of the inability to make the amorphous transformer core large and the high noise, and is very practical. However, the sound-absorbing material is simply wrapped around the inner and outer surfaces of the amorphous iron core body, and its noise reduction effect is not good, and it cannot protect amorphous fragments.

[0005] For example, Chinese utility model patent CN 205122366 U discloses a noise-reducing and vibration-damping pad for amorphous alloy transformers. Both sides of the pad body have striped grooves arranged perpendicularly to each other. In use, the pad body is placed at the interface of the amorphous alloy core, and also at the connection between the transformer body and the tank cover and bottom, effectively reducing the noise of the amorphous alloy transformer and avoiding disruption to residents' lives. Furthermore, the striped grooves on both sides of the body not only effectively save material and reduce costs, but also further improve noise reduction capabilities; moreover, the perpendicular arrangement of the striped grooves on both sides effectively improves the structural strength after the grooves are created, extending the lifespan of the pad. However, this pad only serves to reduce noise and cannot protect amorphous fragments. Summary of the Invention

[0006] To address the aforementioned issues, this invention provides a method for reducing noise and preventing fragment encapsulation in amorphous transformer cores. In the amorphous transformer core assembly process, this method effectively protects the overlapping joints of the amorphous core, ensuring the electrical insulation performance of the product. This encapsulation method not only reduces transformer noise but also effectively prevents core fragments from spilling out, thereby improving the operational reliability of the transformer.

[0007] The present invention provides a method for noise reduction and debris prevention wrapping of amorphous transformer cores. Before assembling the amorphous core, adhesive paper is applied to wrap the core from the inside outwards at the core joints. Several layers of adhesive paper can be applied, using a staggered wrapping method to ensure that the core joints are completely and tightly wrapped. The wrapping method includes the following steps:

[0008] (1) Draw an "out" shaped bend line in the middle of the adhesive paper. The size of this bend line is the inner frame size of the high and low voltage coils.

[0009] (2) Cut out an "X" shape along the four diagonals of the bend line. Using the bend line as the flipping axis, fold the X1 area downwards by 90 degrees, fold the X2 area downwards by 90 degrees, fold the X3 area downwards by 90 degrees, and fold the X4 area downwards by 90 degrees. The resulting shape is as follows: Figure 1 As shown in the figure, surface M is perpendicular to the end face of the coil. The bent X1, X2, X3, and X4 areas are attached to the inner frame of the coil and fixed with tape.

[0010] (3) Cut out the "I" shaped adhesive paper. C1 is the width of the amorphous iron core, and C2 is the opening size of the inner frame of the amorphous iron core. The amorphous iron core has a large frame and a small frame with different sizes. When cutting, the size should be determined according to the actual size of the inner frame opening.

[0011] (4) Insert the amorphous iron core horizontally into the coil. Before inserting, place the cut I-shaped adhesive paper at the opening of the iron core frame and the upper iron yoke position. All four iron core frames should have the same. Insert the iron core into the high and low voltage windings. Place the same I-shaped adhesive paper at the lower iron yoke position of the iron core frame. All four iron core frames should have the same.

[0012] (5) The yoke of the amorphous iron core is lapped in sequence. The lap must be tight and firm. After the lap is completed, apply glass glue to the surface of the iron core. The glass glue is required to be oil-resistant, high temperature-resistant and corrosion-resistant. Then wrap the "I" shaped adhesive paper. The wrap must be tight. There should be no openings in the overlap between the adjacent adhesive papers of the four iron core frames.

[0013] (6) Finally, fold the “X” shaped adhesive paper outward to wrap the overlapping part of the iron core. Apply glass glue to the surface of the iron core wrapped with adhesive paper. It is required to wrap it tightly. There should be no opening at the seam of the overlapping adhesive paper. All three phases A, B and C coils should have this.

[0014] The structural feature is that the shell-type transformer has the winding inside and the iron core outside, which wraps around the winding. After the iron core is inserted into the winding, the lower yoke needs to be closed to achieve a closed magnetic circuit loop.

[0015] Preferably, the amorphous iron core includes an upper yoke and a lower yoke, and the joint of the lower yoke is completely wrapped.

[0016] In any of the above solutions, it is preferred that the adhesive paper is wrapped in alternating layers from left to right. This increases the propagation path of noise, and this wrapping method can effectively isolate a certain amount of outward-transmitted noise.

[0017] In summary, the method for reducing noise and preventing debris from encasing amorphous transformer cores according to the present invention has the following advantages:

[0018] 1. In terms of manufacturing process, the overall wrapping of the yoke joint under the amorphous iron core makes the iron core, winding and clamps fit tightly together to form a whole, which greatly reduces the outflow of debris.

[0019] 2. Amorphous transformers generate noise during operation. Since the bonding surface at the joints of amorphous cores is not as good as that of a single piece, it will increase the noise. The adhesive paper is wrapped in alternating layers on the left and right sides. When the noise is propagating, the propagation path is increased. This wrapping method can effectively isolate a certain amount of noise transmitted outward. Attached Figure Description

[0020] Preferred but non-limiting embodiments of the invention will now be described, and these and other features and advantages of the invention will become apparent upon reading the following detailed description with reference to the accompanying drawings, wherein:

[0021] Figure 1This is a schematic diagram of a preferred embodiment of the adhesive paper used in the method for reducing noise and preventing fragmentation of amorphous transformer cores according to the present invention.

[0022] Figure 2 To provide a method for reducing noise and preventing debris from entangled in the core of an amorphous transformer according to the present invention Figure 1 The preferred embodiment shown is a side view.

[0023] Figure 3 To provide a method for reducing noise and preventing debris from entangled in the core of an amorphous transformer according to the present invention Figure 1 The diagram shown illustrates the application of adhesive paper to the core of this amorphous transformer.

[0024] Figure 4 To provide a method for reducing noise and preventing debris from entangled in the core of an amorphous transformer according to the present invention Figure 3 Side view of the preferred embodiment shown.

[0025] Figure 5 To provide a method for reducing noise and preventing debris from entangled in the core of an amorphous transformer according to the present invention Figure 1 A schematic diagram of the "I"-shaped adhesive paper cut out from the adhesive paper shown.

[0026] Figure 6 This is a schematic diagram of the structure of the amorphous core in the method for reducing noise and preventing fragment encapsulation of the amorphous transformer core according to the present invention.

[0027] Figure 7 This is a schematic diagram of an "I"-shaped adhesive paper inside a core frame in the method for noise reduction and debris prevention of amorphous transformer cores according to the present invention.

[0028] Figure 8 This is a schematic diagram of the process of wrapping the amorphous iron core with adhesive paper in the method for noise reduction and debris prevention of amorphous transformer core according to the present invention.

[0029] Figure 9 This is a schematic diagram of the amorphous transformer core wrapped with adhesive paper in the method for noise reduction and debris prevention of the amorphous transformer core according to the present invention. Detailed Implementation

[0030] The following description is merely exemplary in nature and is not intended to limit this disclosure, its application, or its uses. It should be understood that throughout the drawings, corresponding reference numerals denote the same or corresponding parts and features.

[0031] Now refer to the attached diagram, Figure 1 , Figure 2The structural schematic diagram of a preferred embodiment of the dispensing paper in the method for reducing noise and preventing debris wrapping of the amorphous transformer core according to the present invention is described. A method for reducing noise and preventing debris wrapping of an amorphous transformer core. Before assembling the amorphous core, use dispensing paper to wrap from the inside to the outside of the core joint. Several layers can be wrapped in an overlapping manner, and a staggered wrapping method is used to completely wrap the core joint tightly. The wrapping method includes the following steps:

[0032] (1) Draw an "O"-shaped bending line in the middle of the dispensing paper (as shown in Figure 1 ), and the size of this bending line is the inner frame size of the high- and low-voltage coils;

[0033] (2) Cut out an "X" shape along the four diagonals of the bending line. With the bending line as the flipping axis, fold the X1 area downward by 90 degrees, fold the X2 area downward by 90 degrees, fold the X3 area downward by 90 degrees, and fold the X4 area downward by 90 degrees. The folded shape is as shown in Figure 1 . In the figure, the M surface is perpendicular to the coil end face. After bending, the X1, X2, X3, and X4 area surfaces are fitted to the inner frame surface of the coil and fixed with tape (as shown in Figure 3 , Figure 4 ). The upper and lower end faces of each phase coil are fixed in the same way, and all three-phase coils A, B, and C have them);

[0034] (3) Cut out an "I"-shaped dispensing paper, as shown in Figure 5 . The C1 dimension is the bandwidth dimension of the amorphous core, and the C2 dimension is the inner frame opening dimension of the amorphous core. The amorphous core has a large frame and a small frame with different sizes. When cutting, it is determined according to the actual inner frame opening size;

[0035] Figure 6 is the amorphous core, showing an inverted "U" shape structure, and the opening is the lower yoke.

[0036] (4) Horizontally insert the amorphous core into the coil. Before insertion, first place the cut "I"-shaped dispensing paper at the upper yoke position of the inner frame opening of the core as shown in Figure 7 . All four core frames have the same. Insert the core into the high- and low-voltage windings 2. Place the same "I"-shaped dispensing paper at the lower yoke position of the inner frame of the core. All four core frames have the same. As shown in Figure 7 , the figure only shows the "I"-shaped dispensing paper in one core frame for easy recognition;

[0037] (5) The lower yoke of the amorphous core is overlapped with the joint in sequence. The overlap must be tight and firm. After overlapping, apply glass glue on the surface of the core. The glass glue is required to be oil-resistant, high-temperature-resistant, and corrosion-resistant. Then wrap the "I"-shaped dispensing paper as shown in Figure 8 , and it is required to be wrapped tightly, and there should be no openings in the overlapping seams between the adjacent dispensing papers of the four core frames;

[0038] (6) Finally, press the "X" shaped adhesive paper 1. Figure 9 Fold outwards as shown to wrap the overlapping part of the amorphous iron core 3. Apply glass glue to the surface of the iron core wrapped with adhesive paper 1. It is required to wrap it tightly and there should be no openings at the seams of the overlapping adhesive paper. All three phase coils A, B and C are covered.

[0039] The structural feature is that the shell-type transformer has the winding inside and the iron core outside, which wraps the high and low voltage windings 2. After the iron core is inserted into the high and low voltage windings 2, the lower yoke needs to be closed and overlapped to achieve a closed magnetic circuit loop.

[0040] In this embodiment, the amorphous iron core includes an upper yoke and a lower yoke, and the joint of the lower yoke is completely wrapped.

[0041] In this embodiment, the adhesive paper is wrapped in alternating layers from left to right.

[0042] Although the invention has been disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and not intended to limit the application of the invention. The scope of protection of the invention is defined by the appended claims and may include various modifications, alterations, and equivalents made to the invention without departing from its scope and spirit.

Claims

1. A method for reducing noise and preventing debris from entanglement in an amorphous transformer core, characterized in that, Before assembling the amorphous iron core, use dispensing paper to wrap from the inside to the outside of the iron core joint, stack and wrap multiple layers, and use a staggered wrapping method to completely wrap the iron core joint tightly. The wrapping method includes the following steps: (1) Draw a square-shaped bending line in the middle of the dispensing paper, and the size of this bending line is the inner frame size of the high- and low-voltage coils; (2) Cut out an "X" shape along the four diagonals of the bending line. With the bending line as the flipping axis, fold the X1 area down by 90 degrees, fold the X2 area down by 90 degrees, fold the X3 area down by 90 degrees, and fold the X4 area down by 90 degrees. The main surface of the dispensing paper is the M surface, and the M surface is perpendicular to the coil end face. After bending, the X1, X2, X3, and X4 area surfaces fit the inner frame surface of the coil, and fix them with tape; (3) Cut out an "I"-shaped dispensing paper; (4) Horizontally insert the amorphous iron core into the coil. Before insertion, first place the cut "I"-shaped dispensing paper at the position of the upper yoke at the opening of the inner frame of the iron core. There are four iron core frames in the same way. Insert the iron core into the high- and low-voltage windings, and place the same "I"-shaped dispensing paper at the position of the lower yoke of the inner frame of the iron core. There are four iron core frames in the same way; (5) The lower yoke of the amorphous iron core overlaps the joints in sequence. After overlapping, apply glass glue on the surface of the iron core, and then wrap the "I"-shaped dispensing paper, requiring tight wrapping. There should be no openings in the overlapping seams between the adjacent dispensing papers of the four iron core frames; (6) Finally, fold the "X"-shaped dispensing paper outwards to wrap the overlapping part of the iron core, apply glass glue on the surface of the iron core wrapped with dispensing paper, requiring tight wrapping. There should be no openings at the overlapping seams of the adjacent dispensing papers. This applies to all three-phase coils A, B, and C.

2. The method for reducing noise and preventing debris from entanglement in amorphous transformer cores as described in claim 1, characterized in that: The amorphous iron core includes an upper yoke and a lower yoke, and the joint of the lower yoke is integrally wrapped.

3. The method for reducing noise and preventing debris from entanglement in amorphous transformer cores as described in claim 1 or 2, characterized in that: The wrapping method of the dispensing paper is left-right staggered laminated wrapping.

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