Voltage regulating coil for transformer

Abstract

The utility model relates to a voltage regulating coil for a transformer. The voltage regulating coil comprises a plurality of continuously connected wire cakes which are coaxially arranged, the plurality of wire cakes comprise a plurality of groups, each group comprises two adjacent wire cakes, and each group corresponds to one voltage regulating gear; a plurality of odd voltage regulation gears are continuously arranged to form a first voltage regulation part, a plurality of even voltage regulation gears are continuously arranged to form a second voltage regulation part, the first voltage regulation part and the second voltage regulation part are arranged in the axial direction, or one wire cake of a group corresponding to one even voltage regulation gear is arranged between two wire cakes of a group corresponding to one odd voltage regulation gear, and one wire cake of a group corresponding to one even voltage regulation gear is arranged between two wire cakes of a group corresponding to one odd voltage regulation gear. Or one wire cake of the group corresponding to the other odd voltage regulation gear is arranged between the two wire cakes of the group corresponding to one odd voltage regulation gear, and one wire cake of the group corresponding to the other even voltage regulation gear is arranged between the two wire cakes of the group corresponding to one even voltage regulation gear. According to the voltage regulating coil, the total series capacitance can be increased by improving the arrangement mode of the wire cakes, and therefore the high impulse voltage endurance capacity of the voltage regulating coil is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of voltage regulation of transformers, and in particular, to a voltage regulating coil for a transformer. Background Art

[0002] Currently, transformer voltage regulating coils typically include continuous pancake-shaped coils, also known as wire pancakes. These coils are formed by winding multiple turns of a conductor radially around the coil, forming a pancake. Multiple pancakes are then arranged axially along the coil. These pancake-shaped coils offer excellent heat dissipation, high mechanical strength, and a wide range of applications. However, they suffer from poor surge voltage resistance.

[0003] When the impact voltage of the pancake-type voltage-regulating coil is high, the prior art generally uses two solutions: (1) installing a lightning arrester or using a tangled voltage-regulating coil known in the art to reduce the generated voltage; (2) improving the insulation level of the switch of the voltage-regulating coil and increasing the distance between the leads.

[0004] Among the above solutions, the first solution is costly and has increased manufacturing difficulty; the second solution increases the size of the transformer body. Utility Model Content

[0005] In order to solve the problems in the prior art, the present application proposes an improved voltage regulating coil for a transformer, which increases the total series capacitance by improving the arrangement of the coils, thereby improving the voltage regulating coil's ability to withstand high impulse voltages.

[0006] In view of this, the present application proposes a voltage regulating coil for a transformer, which improves the ability to withstand high impulse voltage by increasing the total series capacitance. The voltage regulating coil not only has a small body size but also has low manufacturing difficulty and low cost.

[0007] According to one aspect of the present application, a voltage regulating coil for a transformer is provided, comprising a plurality of continuously connected coils (100) arranged coaxially, the plurality of continuously connected coils having the same spacing along the axial direction, wherein each coil is formed by continuously winding a first number of turns of a conducting wire radially outward or radially inward; wherein the plurality of coils comprises a plurality of groups, each group comprises two adjacent coils, and each group corresponds to a voltage regulating step; wherein a plurality of odd-numbered voltage regulating steps are sequentially arranged to form a first voltage regulating portion, and a plurality of even-numbered voltage regulating steps are sequentially arranged to form a second voltage regulating portion, the first voltage regulating portion and the second voltage regulating portion are sequentially arranged along the axial direction, or a coil of a group corresponding to an odd-numbered voltage regulating step is arranged between two coils of the group corresponding to the odd-numbered voltage regulating step, or a coil of a group corresponding to another odd-numbered voltage regulating step is arranged between two coils of the group corresponding to the odd-numbered voltage regulating step, and a coil of a group corresponding to another even-numbered voltage regulating step is arranged between two coils of the group corresponding to the even-numbered voltage regulating step.

[0008] In this way, compared with the sequential arrangement of the voltage regulating stages in the prior art, the present invention discloses three improved arrangements of the voltage regulating coils, which can increase the total series capacitance of multiple voltage regulating stages to varying degrees, thereby improving the high impulse voltage tolerance of the voltage regulating coils. At the same time, not only is the transformer body small in size, but the manufacturing difficulty and cost are also low.

[0009] According to an exemplary embodiment of the present application, the first pressure regulating gear, the third pressure regulating gear, the fifth pressure regulating gear and the seventh pressure regulating gear are arranged in sequence to form the first pressure regulating part, and the eighth pressure regulating gear, the sixth pressure regulating gear, the fourth pressure regulating gear and the second pressure regulating gear are arranged in sequence to form the second pressure regulating part, and the first pressure regulating part and the second pressure regulating part are arranged in sequence along the axial direction.

[0010] In this way, the present disclosure describes a first arrangement of voltage regulating coils by using a specific example, which can increase the total series capacitance of multiple voltage regulating stages.

[0011] According to an exemplary embodiment of the present application, one wire cake of the group corresponding to the second pressure regulating gear is arranged between the two wire cakes of the group corresponding to the first pressure regulating gear arranged axially, and one wire cake of the group corresponding to the fourth pressure regulating gear is arranged between the two wire cakes of the group corresponding to the third pressure regulating gear arranged axially.

[0012] In this way, the present disclosure describes a second arrangement of voltage regulating coils by using a specific example, which can also increase the total series capacitance of multiple voltage regulating stages.

[0013] According to an exemplary embodiment of the present application, a coil of the group corresponding to the third pressure regulating gear is arranged between the two coils of the group corresponding to the first pressure regulating gear arranged axially, and a coil of the group corresponding to the fourth pressure regulating gear is arranged between the two coils of the group corresponding to the second pressure regulating gear.

[0014] In this way, the present disclosure describes the third arrangement of the voltage regulating coil with a specific example. This arrangement can further increase the total series capacitance of multiple voltage regulating gears. The increase in the total series capacitance can reduce the voltage fluctuation in the system, improve the stability and reliability of the system, and improve the system's ability to resist high impact voltage.

[0015] According to an exemplary embodiment of the present application, each voltage regulating gear has a total turn-to-turn capacitance and an inter-pancake capacitance, there is an inter-gear capacitance between adjacent voltage regulating gears, and multiple voltage regulating gears of multiple wire cakes have a total series capacitance calculated by the number of the voltage regulating gears, the total turn-to-turn capacitance, the inter-pancake capacitance and the inter-gear capacitance.

[0016] According to an exemplary embodiment of the present application, the number of the plurality of voltage regulation steps is 8, and the first number is 5 turns.

[0017] In this way, multiple voltage adjustment levels can avoid safety hazards caused by excessively high or low voltage, protecting the safety of equipment and users. By increasing the number of voltage adjustment levels, users can select a more appropriate level based on their specific needs and circumstances, thereby more accurately adjusting the voltage and achieving better results. The present disclosure is not limited to this.

[0018] According to an exemplary embodiment of the present application, one bobbin in each group has an incoming terminal, and the other bobbin has an outgoing terminal, and the incoming terminal and the outgoing terminal are connected to an external load.

[0019] In this way, each group of corresponding voltage regulating steps is connected to the external load through the input terminal and the output terminal.

[0020] In an embodiment of the present application, a technical solution is provided for improving the arrangement of a plurality of continuously connected coils to increase the total series capacitance of a plurality of voltage regulating gears corresponding to the plurality of coils, so as to at least solve the technical problem in the prior art that the total series capacitance of a plurality of continuously connected coils is low, resulting in poor high impulse voltage tolerance, thereby achieving not only improved high impulse voltage tolerance of the voltage regulating coil, but also a technical effect of small device body size, low manufacturing difficulty and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0022] Figure 1 This is an electrical schematic diagram of a plurality of voltage regulating stages corresponding to a plurality of continuously connected coils of a voltage regulating coil in the prior art arranged in sequence;

[0023] Figure 2 This is an electrical schematic diagram of a plurality of voltage regulating steps corresponding to a plurality of continuously connected coils arranged in an interval manner according to a first embodiment of the present disclosure;

[0024] Figure 3 is an electrical schematic diagram of a plurality of voltage regulating steps corresponding to a plurality of continuously connected coils arranged in a staggered manner according to a second embodiment of the present disclosure;

[0025] Figure 4 is an electrical schematic diagram of a plurality of voltage regulating steps corresponding to a plurality of continuously connected coils arranged in an interlaced manner according to a third embodiment of the present disclosure;

[0026] Figure Numbers

[0027] 100: thread cake;

[0028] D1: first gear;

[0029] D2: second gear;

[0030] D3: third gear;

[0031] D4: fourth gear;

[0032] D5: fifth gear;

[0033] D6: sixth gear;

[0034] D7: seventh gear;

[0035] D8: Eighth gear. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the embodiments described herein. In the accompanying drawings, for the sake of clarity, parts that are not related to the description of the present application will be omitted. Similar reference numerals refer to similar elements throughout the description. In addition, when providing a description with reference to the accompanying drawings, although the elements are represented by the same numerals, the reference numerals relating to the elements may be changed, and the reference numerals are described only for the convenience of description, and should not be understood as limiting the concepts, features, functions or effects of the elements to the reference numerals.

[0037] Continuous pancake-type voltage regulator coils are widely used in existing technology due to their excellent heat dissipation and high mechanical strength. However, these coils have poor surge voltage resistance. Transformers using these coils undergo high surge voltage testing before leaving the factory for customer use, and are often subjected to lightning strikes during customer use. This poor surge voltage resistance limits the use of these transformers. Therefore, improvements are needed to improve the surge voltage resistance of these coils.

[0038] In view of this, the present application proposes an improved voltage regulating coil for a transformer, which increases the total series capacitance by improving the arrangement of the coils, thereby improving the voltage regulating coil's ability to withstand high impulse voltages.

[0039] Figure 1 It is an electrical schematic diagram of a plurality of voltage regulating gears corresponding to a plurality of continuously connected coils of a voltage regulating coil in the prior art arranged in sequence.

[0040] like Figure 1 As shown, multiple coils 100, numbered 4 to 12, are coaxially arranged from top to bottom and connected by wires. The coils 100 are spaced evenly along the axial direction, with insulating oil flowing within the spacing, providing excellent insulation and heat dissipation.

[0041] Each bobbin is formed by continuously winding a first number of turns of a conductive wire in a radial direction perpendicular to the axial direction, the first number being, for example, 5 turns, but the present disclosure is not limited thereto.

[0042] The multiple coils 100 are divided into multiple groups, each group including two adjacent coils, and each group corresponds to a voltage regulation level. As shown in the figure, coils numbered 4 and 5 form a group, corresponding to the first voltage regulation level D1; coils numbered 5 and 6 correspond to the second voltage regulation level D2; coils numbered 6 and 7 correspond to the third voltage regulation level D3; coils numbered 7 and 8 correspond to the fourth voltage regulation level D4; coils numbered 8 and 9 correspond to the fifth voltage regulation level D5; coils numbered 9 and 10 correspond to the sixth voltage regulation level D6; coils numbered 10 and 11 correspond to the seventh voltage regulation level D7; coils numbered 11 and 12 correspond to the eighth voltage regulation level D2. And so on, the coils numbered 4 to 12 are divided into eight groups, i.e., eight voltage regulation levels. Figure 1 The eight voltage regulating steps are arranged in sequence. However, in this arrangement, the total voltage of the eight voltage regulating steps in series is low, and the ability to withstand impulse voltage is poor.

[0043] Figure 2 1 is an electrical schematic diagram showing that a plurality of voltage regulating steps corresponding to a plurality of continuously connected coils are arranged in an interval manner according to the first embodiment of the present disclosure.

[0044] like Figure 2 As shown, one bobbin in each group has an input terminal, and the other bobbin has an output terminal, and the input terminal and the output terminal are connected to an external load.

[0045] like Figure 1 The 8 voltage adjustment levels shown are limited in Figure 2 Specifically, the spacing arrangement is as follows: a plurality of odd-numbered pressure regulating gears are sequentially arranged to form a first pressure regulating portion, a plurality of even-numbered pressure regulating gears are sequentially arranged to form a second pressure regulating portion, and the first pressure regulating portion and the second pressure regulating portion are sequentially arranged along the axial direction. Figure 2 It can be seen that the first pressure regulating gear D1, the third pressure regulating gear D3, the fifth pressure regulating gear D5 and the seventh pressure regulating gear D7 are arranged in sequence to form the first pressure regulating part, and the eighth pressure regulating gear D8, the sixth pressure regulating gear D6, the fourth pressure regulating gear D4 and the second pressure regulating gear D2 are arranged in sequence to form the second pressure regulating part. The first pressure regulating part and the second pressure regulating part are arranged in sequence along the axial direction.

[0046] However, the present disclosure is not limited to this, and the arrangement of the 8 pressure regulating gears can also be that the first pressure regulating gear D1, the third pressure regulating gear D3, the fifth pressure regulating gear D5 and the seventh pressure regulating gear D7 are arranged in sequence to form the first pressure regulating part, the second pressure regulating gear D2, the fourth pressure regulating gear D4, the sixth pressure regulating gear D6 and the eighth pressure regulating gear D8 are arranged in sequence to form the second pressure regulating part, and the first pressure regulating part and the second pressure regulating part are arranged in sequence along the axial direction.

[0047] The wires are drawn from the coil 5 in the first voltage regulating stage D1 to serve as the coil 5 in the second voltage regulating stage D2. Similarly, coils with double-numbered coils in multiple voltage regulating stages are all formed in this way.

[0048] In the voltage regulating coil, when the number of voltage regulating gears is 8, the total inter-turn capacitance of each voltage regulating gear is C1, the inter-cake capacitance of the two coils of each voltage regulating gear is C2, and the inter-gear capacitance between adjacent voltage regulating gears is C3. Then the total series capacitance C of the multiple voltage regulating gears of the multiple coils is calculated by the number of the voltage regulating gears, the total inter-turn capacitance, the inter-cake capacitance and the inter-gear capacitance. Specifically, for example, the calculation method of the total series capacitance is C=N*(C1+C2)+(N-1)*C3.

[0049] When the number of turns per cake is the same, for example, when the number of turns per cake is 5, assuming that the geometric capacitance between adjacent turns is 450 picofarads and the geometric capacitance between adjacent cakes is 700 picofarads, the total series capacitance of the 8 voltage regulating gears in the prior art is 7288 picofarads, and the total series capacitance of this interval arrangement is 13821.1 picofarads, which is 1.896 times that of the prior art solution.

[0050] The above data in this disclosure are only examples, and when the number of turns per cake changes, the capacitance between adjacent turns and the capacitance between adjacent cakes will change accordingly.

[0051] Figure 2 The spacing arrangement shown effectively and significantly increases the total series capacitance of the voltage regulating coil, thereby improving the tolerance to high surge voltages.

[0052] Figure 3 1 is an electrical schematic diagram showing a plurality of voltage regulating steps corresponding to a plurality of continuously connected coils arranged in a staggered manner according to a second embodiment of the present disclosure.

[0053] like Figure 1 The 8 voltage adjustment levels shown are limited in Figure 3 Specifically, the staggered arrangement is as follows: one coil of the group corresponding to an even-numbered voltage regulation step is arranged between two coils of the group corresponding to an odd-numbered voltage regulation step. Figure 3As shown, a coil of the group corresponding to the second pressure regulating gear D2 is arranged between the two coils of the group corresponding to the first pressure regulating gear D1 arranged axially, a coil of the group corresponding to the fourth pressure regulating gear D4 is arranged between the two coils of the group corresponding to the third pressure regulating gear D3 arranged axially; a coil of the group corresponding to the sixth pressure regulating gear D6 is arranged between the two coils of the group corresponding to the fifth pressure regulating gear D5 arranged axially; and a coil of the group corresponding to the eighth pressure regulating gear D8 is arranged between the two coils of the group corresponding to the seventh pressure regulating gear D7 arranged axially.

[0054] However, the present disclosure is not limited to this arrangement, and the eight voltage regulating stages may be arranged in a staggered manner.

[0055] When the number of turns per cake is the same, for example, when the number of turns per cake is 5, assuming that the geometric capacitance between adjacent turns is 450 picofarads and the geometric capacitance between adjacent cakes is 700 picofarads, the total series capacitance of the 8 voltage regulating gears in the prior art is 7288 picofarads, and the total series capacitance of the staggered arrangement is 18952.4 picofarads, which is 2.6005 times that of the prior art solution.

[0056] Figure 3 The staggered arrangement shown effectively and significantly increases the total series capacitance of the voltage regulating coils, thereby improving the tolerance to high impulse voltages.

[0057] Figure 4 1 is an electrical schematic diagram showing that a plurality of voltage regulating steps corresponding to a plurality of continuously connected coils are arranged in an interlaced manner according to a third embodiment of the present disclosure.

[0058] like Figure 1 The 8 voltage adjustment levels shown are limited in Figure 4 Specifically, the staggered arrangement is as follows: between two wire cakes of a group corresponding to an odd-numbered voltage regulating gear, a wire cake of a group corresponding to another odd-numbered voltage regulating gear is arranged; between two wire cakes of a group corresponding to an even-numbered voltage regulating gear, a wire cake of a group corresponding to another even-numbered voltage regulating gear is arranged. Figure 4 As shown, a coil of the group corresponding to the third pressure regulating gear D3 is arranged between the two coils of the group corresponding to the first pressure regulating gear D1 arranged axially, a coil of the group corresponding to the fourth pressure regulating gear D4 is arranged between the two coils of the group corresponding to the second pressure regulating gear D2, and so on, a coil of the group corresponding to the seventh pressure regulating gear D7 is arranged between the two coils of the group corresponding to the fifth pressure regulating gear D5, and a coil of the group corresponding to the eighth pressure regulating gear D8 is arranged between the two coils of the group corresponding to the sixth pressure regulating gear D6.

[0059] However, the present disclosure is not limited to this arrangement, and the eight voltage regulating stages may be arranged in an interlaced manner.

[0060] When the number of turns per cake is the same, for example, when the number of turns per cake is 5, assuming that the geometric capacitance between adjacent turns is 450 picofarads and the geometric capacitance between adjacent cakes is 700 picofarads, the total series capacitance of the 8 voltage regulating gears in the prior art is 7288 picofarads, and the total series capacitance of the staggered arrangement is 24088 picofarads, which is 3.305 times that of the prior art solution.

[0061] Figure 4 The staggered arrangement shown effectively and significantly increases the total series capacitance of the voltage regulating coils, thereby improving the tolerance to high impulse voltages.

[0062] In an embodiment of the present application, a technical solution is provided for improving the arrangement of a plurality of continuously connected coils to increase the total series capacitance of a plurality of voltage regulating gears corresponding to the plurality of coils, so as to at least solve the technical problem in the prior art that the total series capacitance of a plurality of continuously connected coils is low, resulting in poor high impulse voltage tolerance, thereby achieving not only improved high impulse voltage tolerance of the voltage regulating coil, but also a technical effect of small device body size, low manufacturing difficulty and low cost.

[0063] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0064] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways.

[0065] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A voltage regulating coil for a transformer, characterized in that: The voltage regulating coil comprises: A plurality of continuously connected bobbins (100) are coaxially arranged, the plurality of continuously connected bobbins having the same spacing in the axial direction, wherein each bobbin is formed by continuously winding a first number of turns of a conductor radially outward or radially inward; The plurality of coils include a plurality of groups, each group includes two adjacent coils, and each group corresponds to a voltage adjustment gear; Among them, a plurality of odd-numbered pressure regulating gears (D1, D3, D5, D7) are arranged in sequence along the axial direction to form a first pressure regulating part, a plurality of even-numbered pressure regulating gears (D8, D6, D4, D2) are arranged in sequence along the axial direction to form a second pressure regulating part, and the first pressure regulating part and the second pressure regulating part are arranged in sequence along the axial direction, or A coil of the group corresponding to the even-numbered voltage regulating gear is arranged between two coils of the group corresponding to the odd-numbered voltage regulating gear, or A wire coil of another group corresponding to the odd-numbered voltage regulating gear is arranged between the two wire coils of the group corresponding to the odd-numbered voltage regulating gear, and a wire coil of another group corresponding to the even-numbered voltage regulating gear is arranged between the two wire coils of the group corresponding to the even-numbered voltage regulating gear.

2. The voltage regulating coil according to claim 1, characterized in that: The first pressure regulating gear, the third pressure regulating gear, the fifth pressure regulating gear and the seventh pressure regulating gear are arranged continuously to form the first pressure regulating part, and the eighth pressure regulating gear, the sixth pressure regulating gear, the fourth pressure regulating gear and the second pressure regulating gear are arranged continuously to form the second pressure regulating part. The first pressure regulating part and the second pressure regulating part are arranged axially.

3. The voltage regulating coil according to claim 1, characterized in that: A coil of the group corresponding to the second pressure regulating gear is arranged between the two coils of the group corresponding to the first pressure regulating gear arranged axially, and a coil of the group corresponding to the fourth pressure regulating gear is arranged between the two coils of the group corresponding to the third pressure regulating gear arranged axially.

4. The voltage regulating coil according to claim 1, characterized in that: A coil of the group corresponding to the third pressure regulating gear is arranged between the two coils of the group corresponding to the first pressure regulating gear arranged axially, and a coil of the group corresponding to the fourth pressure regulating gear is arranged between the two coils of the group corresponding to the second pressure regulating gear.

5. The voltage regulating coil according to claim 1, characterized in that: Each voltage regulating gear has a total inter-turn capacitance and an inter-pancake capacitance, and there is an inter-stage capacitance between adjacent voltage regulating gears, and the multiple voltage regulating gears of the multiple wire pancakes have a total series capacitance calculated by the number of the voltage regulating gears, the total inter-turn capacitance, the inter-pancake capacitance and the inter-stage capacitance.

6. The voltage regulating coil according to claim 1, characterized in that: The number of the plurality of voltage regulating gears is 8, and the first number is 5 turns.

7. The voltage regulating coil according to claim 1, characterized in that: One bobbin in each group has an incoming terminal, and the other bobbin has an outgoing terminal, and the incoming terminal and the outgoing terminal are connected to an external load.

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