Short-circuit protection assembly for secondary winding of power transformer

Abstract

The utility model discloses a short-circuit protection assembly for a secondary winding of a power transformer. The short-circuit protection assembly comprises an iron core, the secondary winding and a short-circuit protection assembly body. The plurality of layers of secondary windings are uniformly wound on the outer side of the iron core; the short-circuit protection assembly comprises a plurality of inter-group protection shells which are arranged between the secondary winding and winding layers and are different in size and an outer-layer protection shell arranged on the outermost layer of the secondary winding, spiral grooves used for containing the windings are formed in the inner sides and the outer sides of the inter-group protection shells, and spiral grooves are formed in the inner side wall of the outer-layer protection shell; the inter-group protection shell and the outer layer protection shell are both of a cylindrical barrel-shaped body structure. Through the arrangement of the short-circuit protection assembly, it can be guaranteed that breakdown between the layers of the winding due to overvoltage does not occur, the insulation effect between the layers of the winding can be guaranteed through the arrangement of the assembly protection shell, and the winding on the outer layer can be guaranteed through the arrangement of the outer layer protection shell.

Description

Technical Field

[0001] This utility model relates to the field of secondary winding technology, and more specifically, to a short-circuit protection component for the secondary winding of a power transformer. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary winding, secondary winding, and iron core (magnetic core). Its main functions include voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer).

[0003] The secondary winding is an essential component of a transformer. In all transformers, the secondary winding must never be short-circuited. When the secondary winding is short-circuited, it is equivalent to forming a loop with almost no resistance on the secondary side. Since the voltage on the secondary side comes from the primary side, when the resistance R is close to zero, the short-circuit current will increase dramatically, even reaching tens or hundreds of times the rated current. Thousands of amperes of current can cause high temperatures to be generated in the transformer, or electromagnetic forces can cause huge squeezing between the windings, resulting in damage. The current on the primary side can be controlled by itself, and because it has fewer turns, it is relatively more controllable and safer.

[0004] Currently, secondary windings, due to their large and dense number of turns, are often manufactured with artificial winding threading, which may result in damage to the winding sheath. This damage can occur during operation due to breakdown, melting of the enamel sheath, or even short circuits. The most common cause of short circuits between layers is damage to the enamel sheath, leading to overheating and burning out the transformer. The instantaneous high temperature is enough to melt the enamel sheath of the secondary winding while burning all the fuses. Utility Model Content

[0005] The purpose of this utility model is to provide a short-circuit protection component for the secondary winding of a power transformer, which can assist in the installation of the secondary winding and is resistant to mechanical short-circuit protection.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a short-circuit protection component for the secondary winding of a power transformer, comprising an iron core, a secondary winding, and a short-circuit protection component.

[0007] Several layers of secondary windings are evenly wound on the outside of the iron core.

[0008] The short-circuit protection assembly includes several inter-group protective shells of different sizes disposed between the secondary winding and the winding level, and an outer protective shell disposed on the outermost layer of the secondary winding. The inner and outer sides of the inter-group protective shells are provided with helical grooves for accommodating the windings, and the inner sidewall of the outer protective shell is provided with helical grooves. Both the inter-group protective shells and the outer protective shells are cylindrical structures.

[0009] By setting up short-circuit protection components, it can be ensured that the winding layers will not break down due to overvoltage. By setting up component protective shells, the insulation effect between winding layers can be ensured, and by setting up outer protective shells, the outer windings can be protected.

[0010] The present invention is further configured such that: the inter-group protective shell is formed by connecting several inter-group protective units together, and the contact surface of two adjacent inter-group protective units is provided with mating holes for connecting the two inter-group protective units.

[0011] By using multiple mating holes, it can fix itself and adjacent inter-group protection units through soft metal fracture-resistant columns.

[0012] The present invention is further configured such that: the inter-group protection unit is a half-cylinder structure cut along the axis of the cylinder, and at least two inter-group protection units are connected to each other to form a hollow cylindrical structure.

[0013] The cylindrical structure formed by enclosing the semi-circular shell makes installation easier and reduces installation difficulty.

[0014] The present invention is further configured such that: the outer protective shell is formed by connecting and surrounding several outer protective units.

[0015] The problem of external insulation can be effectively solved by setting an outer protective shell.

[0016] The present invention is further configured such that: the outer protective unit is a half-cylinder structure cut along the axis of the cylinder, and at least two outer protective units are joined together to form a hollow cylindrical structure.

[0017] Two or more outer protection units can be easily installed between each other.

[0018] The present invention is further configured such that a break-fitting insert is provided in the mating hole.

[0019] The insert can be made of soft metal in the form of a spindle-shaped fracture structure, or it can be a regular cylindrical structure with an interference fit. Simply fixing it in place will achieve the desired fixation effect.

[0020] The present invention is further configured such that: there is a back rib inserted between the two adjacent spiral grooves and the winding.

[0021] The back bracing effectively isolates voltage breakdown between windings on the same layer.

[0022] In summary, this utility model has the following beneficial effects: the short-circuit protection component ensures that the winding layers will not break down due to overvoltage; the component protective shell ensures the insulation effect between winding layers; and the outer protective shell ensures the protection of the outer winding. Attached Figure Description

[0023] Figure 1 This is a perspective view of the short-circuit protection component after installation in an embodiment of this utility model;

[0024] Figure 2 This is a cross-sectional view of the short-circuit protection component in an embodiment of this utility model;

[0025] Figure 3 This is a top view of the short-circuit protection component in an embodiment of this utility model;

[0026] Figure 4 This is an embodiment of the present utility model. Figure 2 Enlarged view of point A in the middle.

[0027] In the picture:

[0028] 1. Iron core; 2. Secondary winding; 3. Short circuit protection component; 4. Inter-group protection shell; 5. Outer protection shell; 6. Spiral groove; 7. Mating hole; 8. Inter-group protection unit; 9. Outer protection unit; 10. Half groove; 11. Back rib. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0030] It should be noted that if the terms "first," "second," etc., are used in the specification, claims, and accompanying drawings of this utility model, they are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Furthermore, in this utility model, the terms "installation," "setting," "equipped with," "connection," "linking," and "sleeving" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0034] Example

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the short-circuit protection component 3 of the secondary winding 2 of the power transformer includes the iron core 1, the secondary winding 2 and the short-circuit protection component 3.

[0036] Several layers of secondary windings 2 are evenly wound on the outside of the iron core 1.

[0037] In this embodiment, both the secondary winding 2 and the iron core 1 are existing technologies. Various shapes and styles of iron core 1 and secondary winding 2 exist in the prior art, and will not be described in detail in this embodiment.

[0038] The short-circuit protection component 3 includes several inter-group protective shells 4 of different sizes disposed between the secondary winding 2 and the winding layers, and an outer protective shell 5 disposed on the outermost layer of the secondary winding 2. The inner and outer sides of the inter-group protective shells 4 are provided with spiral grooves 6 for accommodating the windings. The inner sidewall of the outer protective shell 5 is provided with spiral grooves 6. Both the inter-group protective shells 4 and the outer protective shell 5 are cylindrical structures. The short-circuit protection component 3 can ensure that the winding layers will not break down due to overvoltage. The protective shells can ensure the insulation effect between winding layers. The outer protective shell 5 can protect the outer winding.

[0039] like Figure 2 As shown, the spiral groove 6 is a spiral groove that conforms to the curvature of the secondary winding 2.

[0040] like Figure 2As shown, the inter-group protective shell 4 is formed by connecting several inter-group protective units 8. The contact surfaces of two adjacent inter-group protective units 8 are provided with mating holes 7 for connecting the two inter-group protective units 8. Through the setting of multiple mating holes 7, it can use its own mating holes 7 to fix itself and the adjacent inter-group protective units 8 through soft metal expansion joints.

[0041] The inter-group protection unit 8 is a half-cylinder structure cut along the cylindrical axis. At least two inter-group protection units 8 are connected to each other to form a hollow cylindrical structure. The cylindrical structure formed by the semi-circular shell makes installation more convenient and reduces the installation difficulty.

[0042] like Figure 2 As shown, the outer protective shell 5 is formed by connecting several outer protective units 9; the outer protective shell 5 can effectively solve the problem of external insulation.

[0043] The outer protective unit 9 is a half-cylinder structure cut along the cylindrical axis, and at least two outer protective units 9 are joined together to form a hollow cylindrical structure; the two can be easily installed together by two or more outer protective units 9.

[0044] The fitting hole 7 is equipped with a fracture-type insert; the insert can be made of soft metal into a shuttle-shaped fracture structure, or it can be a common interference-connected cylindrical structure, which can be simply fixed to achieve the fixing effect.

[0045] There is a back brace 11 inserted between two adjacent spiral grooves 6; the back brace 11 can effectively isolate voltage breakdown between windings in the same layer.

[0046] The spiral groove 6 is a semi-groove 10 with an arc-shaped opening, mainly used to accommodate the enameled wire and specify the direction of the enameled wire. After setting the inter-group protective shell 4, the outer protective shell 5 and the spiral groove 6, if there is uneven winding of the enameled wire, the inter-group protective shell 4 and the outer protective shell 5 will not be able to form a tight fit, which will lead to the discovery of defective products. It is easier to detect defective or substandard products, thereby achieving the screening effect. After forcibly straightening the routing of the secondary winding 2, it can also ensure more uniform heat dissipation, more uniform electric field and reduce leakage flux.

[0047] In this embodiment, in order to solve the insulation problem between multiple layers, as follows: Figure 3 As shown, the protective shell 4 in the group has several different models with varying sizes that gradually increase in size.

[0048] In this embodiment, the outer protective shell and the inter-group protective shell 4 are made of ceramic materials or rigid insulating materials, etc.

[0049] In this embodiment, the number of external protection units is usually 2, but can be 3 when the secondary winding 2 is very large.

[0050] In this embodiment, the number of inter-group protection units 8 is 2, 3, or 4, which is selected according to the size of the secondary winding 2.

[0051] It should be noted that all features disclosed in this specification, or all steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0052] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.

Claims

1. An electrical power transformer secondary winding short circuit protection assembly, characterized by, include: Iron core (1); Secondary winding (2), several layers of secondary winding (2) are evenly wound on the outside of the iron core (1); The short-circuit protection assembly (3) includes several inter-group protection shells (4) of different sizes disposed between the secondary winding (2) and the winding level, and an outer protective shell (5) disposed on the outermost layer of the secondary winding (2). The inner and outer sides of the inter-group protection shell (4) are provided with spiral grooves (6) for accommodating the windings. The inner sidewall of the outer protective shell (5) is provided with spiral grooves (6). Both the inter-group protection shell (4) and the outer protective shell (5) are cylindrical structures.

2. The power transformer secondary winding short circuit protection assembly of claim 1, wherein: The inter-group protective shell (4) is formed by connecting several inter-group protective units (8), and mating holes (7) for connecting the two inter-group protective units (8) are provided on the contact surface of two adjacent inter-group protective units (8).

3. The power transformer secondary winding short circuit protection assembly of claim 2, wherein: The inter-group protection unit (8) is a half-cylinder structure cut along the cylindrical axis, and at least two inter-group protection units (8) are connected to each other to form a hollow cylindrical structure.

4. The electrical transformer secondary winding short circuit protection assembly of claim 1, wherein: The outer protective shell (5) is formed by connecting several outer protective units (9).

5. The power transformer secondary winding short circuit protection assembly of claim 4, wherein: The outer protective unit (9) is a half-cylinder structure cut along the cylindrical axis, and at least two outer protective units (9) are joined together to form a hollow cylindrical structure.

6. The power transformer secondary winding short circuit protection assembly according to any of claims 2-5, characterized by: A break-fitting insert is provided inside the mating hole (7).

7. The power transformer secondary winding short circuit protection assembly of claim 6, wherein: There is a back brace (11) inserted between two adjacent spiral grooves (6) and the winding.

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