Segmented winding type transformer coil and transformer

Abstract

The utility model provides a sectional winding type transformer coil and transformer, the sectional winding type transformer coil comprises at least two line segments, each line segment is provided with a plurality of wire turns, the adjacent line segments are connected in series through a first equipotential connecting line, and the first equipotential connecting line is provided with a plurality of wire turns. The first equipotential connecting line is connected between the last wire turn of the previous line segment and the far-end wire turn of the next line segment, and the far-end wire turn is the wire turn, which is the largest distance from the last wire turn of the previous line segment, in the next line segment. The first equipotential connecting line is connected between the last wire turn of the previous line segment and the far-end wire turn of the next line segment between the two segmented line segments, so that the maximum inter-segment voltage between the adjacent line segments is reduced to be half of that of a traditional winding mode, the partial discharge capacity is reduced, and the risks that transformer cable insulating materials are damaged and even fire breaks out are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field, specifically, the utility model relates to a kind of subsection winding transformer coil and transformer. BACKGROUND

[0002] At present, the extensive use of transformer in power market requires that its product mechanism is reasonable, performance is excellent, insulation is safe and reliable. Figure 1 The existing transformer coil mostly adopts the traditional winding mode as shown in the figure, the winding is composed of two line segments, the two line segments are directly connected between the last turn of the previous line segment and the turn near the proximal end of the next line segment (i.e. the turn of the next line segment close to the last turn of the previous line segment), which results in excessive maximum inter-segment voltage between the two line segments and large partial discharge quantity, and high-energy arc and corona are easily generated during the partial discharge process, which can damage the cable insulation layer and terminal head, making them lose insulation performance, and even possibly ignite the cable insulation material and cause a fire. SUMMARY

[0003] The utility model aims at providing a subsection winding transformer coil capable of reducing winding inter-segment voltage and partial discharge and a transformer applying the subsection winding transformer coil.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] As a first aspect, the utility model provides a subsection winding transformer coil, which includes at least two line segments, each line segment is provided with a plurality of turns, adjacent line segments are connected in series through a first equipotential connection line, the first equipotential connection line is connected between the last turn of the previous line segment and the distal turn of the next line segment, and the distal turn is the turn of the next line segment farthest from the last turn of the previous line segment.

[0006] In one embodiment, adjacent two turns among the plurality of turns in each line segment are connected in series through a second equipotential connection line, and the second equipotential connection line is connected between the two ends of the two turns with the largest spacing.

[0007] In one embodiment, part of the turns are connected with the first and second equipotential connection lines, and the first and second equipotential connection lines are respectively connected to the two ends of the turns.

[0008] As a second aspect, the utility model provides a transformer, which includes a low-voltage winding and a high-voltage winding, and each of the low-voltage winding and the high-voltage winding is provided with the above-described subsection winding transformer coil.

[0009] In one embodiment, the wire segments of the same winding are wound on the same toroidal core, and an insulation separation region is formed between two adjacent wire segments by an insulation material.

[0010] The technical scheme provided by the utility model has the beneficial effects that:

[0011] The segmented winding type transformer coil of the utility model reduces the maximum inter-segment voltage between the adjacent wire segments by half through connecting the first equipotential connecting wire between the last turn of the previous wire segment and the distal end turn of the next wire segment between the two segmented wire segments, thereby reducing the partial discharge amount and the risk of damage to the transformer cable insulation material and even fire. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced.

[0013] Figure 1 It is a winding structure schematic diagram of the existing transformer coil;

[0014] Figure 2 It is a winding structure schematic diagram of the segmented winding type transformer coil provided by one embodiment of the utility model. DETAILED DESCRIPTION

[0015] The embodiments of the utility model will be described in more detail below with reference to the drawings. Although some embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be realized in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided for a more thorough and complete understanding of the utility model. It should be understood that the drawings and embodiments of the utility model are only for exemplary purposes, and are not intended to limit the scope of protection of the utility model.

[0016] It should be understood that each step recorded in the method embodiment of the utility model can be executed in different order and / or in parallel. In addition, the method embodiment can include additional steps and / or omit the execution of the steps shown. The scope of the utility model is not limited in this respect.

[0017] The term "comprising" and its variations as used herein are open-ended, that is "including, but not limited to". The term "connected" can be directly connected, or indirectly connected through intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The related definitions of other terms will be given in the following description.

[0018] It should be noted that the "first", "second" and the like concepts mentioned in the utility model are only used for distinguishing the devices, modules or units, and are not used for limiting these devices, modules or units to be different devices, modules or units, nor for limiting the order or interdependence of the functions performed by these devices, modules or units.

[0019] Referring to Figure 2 The utility model provides a kind of segmented winding transformer coil (hereinafter referred to as "coil") and the transformer of applying the coil, by reducing maximum inter-segment voltage and inter-layer voltage, reduce partial discharge, eliminate the risk of fire caused by high temperature and high energy arc of transformer cable due to partial discharge possibly ignites the insulating material of cable.

[0020] The transformer includes low-voltage winding and high-voltage winding, both of which are segmented winding coil structures, and the number of segments can be set to be the same or different as needed, in the embodiment, the low-voltage winding and the high-voltage winding are each provided with two segments 10, and the two segments 10 in the same winding are connected in series with each other through a first equipotential connecting line 20.

[0021] Each segment 10 includes a plurality of turns 30 connected in series, and the first equipotential connecting line 20 is connected between the last turn of the upper segment and the distal turn of the next segment in the two segments 10, so that the potentials between the two connection points are the same, thereby reducing the maximum inter-segment voltage between the two adjacent segments 10 to half of that of the traditional winding structure, thereby reducing the inter-segment voltage between the adjacent segments 10 and thus reducing the partial discharge. The distal turn is the turn with the maximum distance from the last turn of the upper segment in the next segment, the inter-segment voltage is the potential difference between the respective potential points of the two adjacent segments, and the maximum inter-segment voltage is the absolute value of the maximum potential difference in the two segments.

[0022] In other embodiments, each winding can be provided with three or more segments 10, which can be set according to the voltage requirement of the winding, and the first equipotential connecting line 20 is connected between each two adjacent segments, thereby reducing the maximum inter-segment voltage between the two segments 10.

[0023] Further, the plurality of turns 30 of each segment are arranged in layers, and the two adjacent turns are connected in series through a second equipotential connecting line 40, which is connected between the two ends with the maximum distance between the two turns, thereby reducing the inter-layer voltage between the two adjacent turns 30 in the same segment, further reducing the partial discharge and improving the safety of the transformer.

[0024] Part of the turns are connected with the first equipotential connection line 20 and the second equipotential connection line 40, and the first equipotential connection line 20 and the second equipotential connection line 40 are connected at two ends of the turns respectively.

[0025] It can be understood that the first equipotential connection line 20 is a cable for connecting two points to make the potentials of the two points equal, and the potentials on the first equipotential connection line 20 between different wire sections 10 are different or not all the same, and the second equipotential connection line 40 is a cable for connecting two ends of two adjacent turns 30 to make the potentials of the two ends equal, and the potentials on the second equipotential connection line can be different.

[0026] In addition, it should be understood that the embodiment mainly reduces the partial discharge through the winding structure, the wire used in the winding can use the existing wire, and the multiple wire sections of the same winding can be wound on the same annular core, and the insulating material is arranged between the adjacent wire sections to form an insulating isolation area.

[0027] The above description is only the preferred embodiment of the utility model and the explanation of the applied technical principles. It should be understood by those skilled in the art that the utility model range involved in the utility model is not limited to the technical scheme formed by the specific combination of the above technical features, and should also cover other technical schemes formed by the above technical features or equivalent features in any combination without departing from the above utility model concept. For example, the technical scheme formed by the mutual replacement of the above features and the utility model features (but not limited to) having similar functions in the utility model.

[0028] Although the present subject matter has been described in terms of specific structural features and / or methodological acts, it can be appreciated that the subject matter defined in the appended claims is not restricted to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A fractional wound transformer coil, characterized by, Each of the plurality of turns in each segment is connected in series with an adjacent turn by a second equipotential connecting line, the second equipotential connecting line being connected between two ends of the adjacent turns with the largest spacing therebetween.

2. The fractional wound transformer coil of claim 1, wherein, Each of the plurality of turns in each segment is connected in series with an adjacent turn by a second equipotential connecting line, the second equipotential connecting line being connected between two ends of the adjacent turns with the largest spacing therebetween.

3. The fractional wound transformer coil of claim 2, wherein, Some turns are connected with both the first and second equipotential connecting lines, and the first and second equipotential connecting lines are connected to two ends of the turns, respectively.

4. A transformer comprising a low voltage winding and a high voltage winding, characterized in that The low-voltage winding and the high-voltage winding each comprise the segmented winding transformer coil according to any one of claims 1 to 3.

5. The transformer of claim 4, wherein, Each segment of the same winding is wound on the same toroidal core, and adjacent two segments are insulated from each other by an insulating material.

Images