Multi-section coil structure of oil type transformer
By using a multi-segment coil structure to separate the winding body, the problem of high interlayer voltage in traditional oil-immersed transformers is solved, improving safety performance and short-circuit withstand capability, reducing temperature rise, enhancing coil strength, and achieving faster oil flow and safer operation.
Patent Information
- Application Number
- CN202423198743.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-24
AI Technical Summary
The high-voltage coil structure of traditional oil-immersed transformers results in high interlayer voltage and increased insulation thickness, leading to larger transformer size, higher cost, and susceptibility to overvoltage breakdown, which affects service life.
The multi-segment coil structure divides the main winding into two segments. The low-voltage coil group, high-voltage coil group, and voltage regulating winding are separated by interlayer insulation rings to form oil channels, reduce interlayer voltage difference and number of turns, and improve safety performance.
It improves the safety performance and short-circuit withstand capability of the transformer, reduces temperature rise, enhances the strength of the coil, increases the oil flow rate in the oil passage, and ensures the continuous safe operation of the transformer.
Smart Images
Figure CN223612190U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of transformer, specifically relates to a multistage coil structure of oil type transformer. BACKGROUND
[0002] Oil-immersed transformer is one of important equipment in rural, remote mountainous area, industrial and mining enterprises and civil building power supply and distribution system, it will 10 (6) kV or 35kV network voltage drop to 230 / 400V bus voltage for user.
[0003] The interlayer voltage of the high-voltage coil structure of the conventional transformer is high, the layer insulation is thick, the width dimension of the coil is increased, thereby leading to the increase of the appearance of the transformer and the increase of the cost, secondly, various overvoltages of the transformer such as lightning impulse, operating impulse and atmospheric overvoltage can cause the system voltage to be too high and lead to the insulation damage of the coil of the transformer, thereby affecting the service life of the transformer.
[0004] For the transformer of 35kV and above, if the high-voltage coil is wound in a single section mode, the number of turns of each layer is large, the interlayer voltage is high, the interlayer insulation requirement is high, and the interlayer breakdown is easy to cause accidents. CONTENT OF THE UTILITY MODEL
[0005] In view of the technical defects in the background art, the utility model provides a multistage coil structure of oil type transformer, which solves the above technical problems and meets the actual demand, and the specific technical scheme is as follows:
[0006] A multistage coil structure of oil type transformer, comprising a core column and a winding main body wound outside the core column, the winding main body is provided with an end insulation ring at both ends, the winding main body comprises a low-voltage coil group, a high-voltage coil group and a voltage regulating winding arranged in sequence from inside to outside, and the winding main body is provided with an interlayer insulation ring at the end of the low-voltage coil group, the high-voltage coil group and the voltage regulating winding.
[0007] The winding main body comprises a first winding and a second winding symmetrically arranged from top to bottom along the length direction of the core column, and a middle insulation ring is arranged between the first winding and the second winding.
[0008] As an improvement of the above scheme, the first winding comprises a first low-voltage coil group, a first high-voltage coil group and a first voltage regulating winding arranged in sequence from inside to outside outside the core column.
[0009] As an improvement of the above scheme, the second winding comprises a second low-voltage coil group, a second high-voltage coil group and a second voltage regulating winding arranged in sequence from inside to outside outside the core column.
[0010] As the improvement of the above-mentioned scheme, the two ends of the first winding are respectively provided with first interlayer insulation rings, the first interlayer insulation rings separate the first low-voltage coil group, the first high-voltage coil group and the first voltage regulating winding, so as to form a first oil channel between the first low-voltage coil group, the first high-voltage coil group and the first voltage regulating winding.
[0011] As the improvement of the above-mentioned scheme, the two ends of the second winding are respectively provided with second interlayer insulation rings, the second interlayer insulation rings separate the second low-voltage coil group, the second high-voltage coil group and the second voltage regulating winding, so as to form a second oil channel between the second low-voltage coil group, the second high-voltage coil group and the second voltage regulating winding.
[0012] As the improvement of the above-mentioned scheme, the end insulation ring and the middle insulation ring are formed by stacking insulation paper rings and insulation pads layer by layer.
[0013] As the improvement of the above-mentioned scheme, an angle ring is arranged between the end of the winding main body and the core column.
[0014] As the improvement of the above-mentioned scheme, the outer side of the voltage regulating winding is provided with a plurality of outwardly extending taps.
[0015] The winding main body is divided into two sections, so that the length of the oil channel in the winding main body is shortened, the flow speed of the transformer oil in the oil channel is increased, the heat generated by the winding main body is removed faster, the continuous safe operation ability and the overload capacity are improved, the traditional single-section high-voltage coil group is divided into two sections, the number of turns of the first high-voltage coil group and the second high-voltage coil group is reduced by 1 / 2, the interlayer voltage difference is reduced to 1 / 4 of the original, the coil is not easy to be punctured, the safety performance is greatly improved, the axial short-circuit force of the coil is reduced, the strength of the single coil is increased, and the short-circuit resistance of the transformer is enhanced, in addition, after the first oil channel and the second oil channel are formed after the division, the circulation speed of the transformer oil in the coil oil channel is increased, the local overheating of the coil is prevented, the temperature rise of the transformer is lower, the continuous safe operation ability and the overload capacity are improved. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a winding main body structure diagram of the utility model.
[0017] Figure 2 It is a first winding structure diagram of the utility model.
[0018] Figure 3 It is a second winding structure diagram of the utility model.
[0019] Wherein: iron core column 1, first winding 2, first low voltage coil group 21, first high voltage coil group 22, first voltage regulating winding 23, first interlayer insulation ring 24, first oil channel 25, second winding 3, second low voltage coil group 31, second high voltage coil group 32, second voltage regulating winding 33, second interlayer insulation ring 34, second oil channel 35, end insulation ring 4, interlayer insulation ring 5, angle ring 6, tap 7, coil head 8, middle insulation ring 9. DETAILED DESCRIPTION
[0020] The embodiments of the utility model are not limited to the following examples, and the utility model relates to the necessary components related to the technical field, and should be regarded as the known technology in the technical field, which can be known and mastered by the person skilled in the art.
[0021] A multi-section coil structure of oil type transformer, comprising an iron core column 1 and a winding main body wound outside the iron core column 1, both ends of the winding main body are provided with an end insulation ring 4, the winding main body comprises a low voltage coil group, a high voltage coil group and a voltage regulating winding which are sequentially arranged from inside to outside, and the winding main body is provided with an interlayer insulation ring 5 at the end of the low voltage coil group, the high voltage coil group and the voltage regulating winding;
[0022] In the technical scheme of the winding main body, the winding main body comprises a first winding 2 and a second winding 3 which are symmetrically arranged from top to bottom along the length direction of the iron core column 1, and a middle insulation ring 9 is arranged between the first winding 2 and the second winding 3;
[0023] The traditional single-section winding is separated by the middle insulation ring 9 to form the symmetrically arranged first winding 2 and second winding 3, the number of turns of the first winding 2 and the second winding 3 is reduced by 1 / 2 relative to the number of turns of the traditional single-section winding, and the interlayer voltage difference is reduced to 1 / 4 of the original, so that the interlayer is not easy to break down, the safety performance is greatly improved, the axial short circuit force of the coil is further reduced, the strength of a single coil is increased, and the short circuit resistance of the transformer is enhanced.
[0024] In the technical scheme of the first winding 2, the first winding 2 comprises a first low voltage coil group 21, a first high voltage coil group 22 and a first voltage regulating winding 23 which are sequentially arranged around the outside of the iron core column 1 from inside to outside,
[0025] Further, in the above scheme, both ends of the first winding 2 are provided with a first interlayer insulation ring 24, the first interlayer insulation ring 24 separates the first low voltage coil group 21, the first high voltage coil group 22 and the first voltage regulating winding 23, so as to form a first oil channel 25 between the first low voltage coil group 21, the first high voltage coil group 22 and the first voltage regulating winding 23.
[0026] It should be noted that the first interlayer insulation ring 24 is insulating paper or insulating paperboard, which is used for separating the first low-voltage coil group 21, the first high-voltage coil group 22 and the first voltage regulating winding 23, and forming gaps for the flow of transformer oil between the coil groups, i.e. forming the first oil channel 25. Generally, the number of the first interlayer insulation rings 24 is two, which are arranged at the two ends of the first winding 2 and closely contact with the first winding 2. The transformer oil enters and flows out of the first oil channel 25 through the gaps of the first interlayer insulation rings 24 at the two ends of the first winding 2, thereby taking away the temperature of the coil and achieving the heat dissipation effect.
[0027] In the technical scheme of the second winding 3, the second winding 3 comprises a second low-voltage coil group 31, a second high-voltage coil group 32 and a second voltage regulating winding 33 which are sequentially arranged outside the iron core column 1 from inside to outside.
[0028] Further, in the above scheme, the two ends of the second winding 3 are provided with second interlayer insulation rings 34, the second interlayer insulation rings 34 separate the second low-voltage coil group 31, the second high-voltage coil group 32 and the second voltage regulating winding 33, thereby forming a second oil channel 35 between the second low-voltage coil group 31, the second high-voltage coil group 32 and the second voltage regulating winding 33, which has the same structure and function as the first interlayer insulation ring 24. The second interlayer insulation ring 34 is insulating paper or insulating paperboard, which is used for separating the second low-voltage coil group 31, the second high-voltage coil group 32 and the second voltage regulating winding 33 and forming the second oil channel 35. Generally, the number of the second interlayer insulation rings 34 is two, which are arranged at the two ends of the second winding 3 and closely contact with the second winding 3. The transformer oil enters and flows out of the second oil channel 35 through the gaps of the second interlayer insulation rings 34 at the two ends of the second winding 3, thereby taking away the temperature of the coil and achieving the heat dissipation effect. Further, the second interlayer insulation rings 34 and the first interlayer insulation ring 24 are in contact with each other and are arranged on the two sides of the middle insulation ring 9.
[0029] Further, in the above scheme, the end insulation ring 4 and the middle insulation ring 9 are formed by stacking insulating paperboard rings and insulating pads layer by layer.
[0030] Further, in the above scheme, the outer side of the iron core column 1 is provided with an iron core clamp for clamping the iron core column 1. The end of the winding body is provided with an angle ring 6 between the iron core column 1. The winding body is provided with a coil head 8 which is led out in a direction perpendicular to the axial direction of the winding body. The angle ring 6 is used for strengthening the insulation between the coil head 8 and the iron core clamp.
[0031] In the technical scheme of the voltage regulating winding of the utility model, the outer side of the voltage regulating winding is provided with a plurality of taps 7 which extend outwardly.
[0032] Further, in the above scheme, the first winding 2 and the second winding 3 are arranged symmetrically above and below the central insulation ring 9 as an axis, the first winding 2 is composed of a first basic winding and a first voltage regulating winding 23, the lower winding is composed of a second basic winding and a second voltage regulating winding 33;
[0033] It should be noted that the first basic winding includes a first low-voltage coil group 21 and a first high-voltage coil group 22, and the second basic winding includes a second low-voltage coil group 31 and a second high-voltage coil group 32;
[0034] The first basic winding and the second basic winding combine to form a total basic winding of the coil, and the first voltage regulating winding 23 and the second voltage regulating winding 33 combine to form a total voltage regulating winding of the coil; the first voltage regulating winding 23 and the second voltage regulating winding 33 can lead to a tap 7 according to the actual required number of gears, and the number of turns between the similar taps 7 is fixed as the number of turns required for each voltage difference; the gear switch can be set to take different taps 7 in the first voltage regulating winding 23 and the second voltage regulating winding 33 to form a total voltage regulating winding with different number of turns, and the total number of turns can meet the continuous and stable output of the low-voltage under different high-voltage inputs, and ensure the safety of the electrical equipment.
[0035] The above is only the preferred embodiment of the present application, it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.
Claims
1. A multi-section coil structure for an oil-fired transformer, characterized in that, The application relates to a transformer core column (1) and a winding main body arranged outside the transformer core column (1), two ends of the winding main body are provided with end insulation rings (4), the winding main body comprises low-voltage coil groups, high-voltage coil groups and voltage regulating windings which are sequentially arranged from inside to outside, and the winding main body is provided with interlayer insulation rings (5) at the ends of the low-voltage coil groups, the high-voltage coil groups and the voltage regulating windings. The winding main body comprises a first winding (2) and a second winding (3) which are symmetrically arranged along the length direction of the transformer core column (1) from top to bottom, and a middle insulation ring (9) is arranged between the first winding (2) and the second winding (3).
2. The multi-stage coil structure of an oil transformer according to claim 1, wherein The first winding (2) comprises a first low-voltage coil group (21), a first high-voltage coil group (22) and a first voltage regulating winding (23) which are sequentially arranged outside the transformer core column (1) from inside to outside.
3. The multi-stage coil structure of an oil transformer according to claim 1, wherein The second winding (3) comprises a second low-voltage coil group (31), a second high-voltage coil group (32) and a second voltage regulating winding (33) which are sequentially arranged outside the transformer core column (1) from inside to outside.
4. The multi-stage coil structure of an oil transformer according to claim 2, wherein Both ends of the first winding (2) are provided with first interlayer insulation rings (5) (24), the first interlayer insulation rings (5) (24) separate the first low-voltage coil group (21), the first high-voltage coil group (22) and the first voltage regulating winding (23), so that a first oil channel (25) is formed between the first low-voltage coil group (21), the first high-voltage coil group (22) and the first voltage regulating winding (23).
5. The multi-stage coil structure of an oil transformer according to claim 3, wherein Both ends of the second winding (3) are provided with second interlayer insulation rings (5) (34), the second interlayer insulation rings (5) (34) separate the second low-voltage coil group (31), the second high-voltage coil group (32) and the second voltage regulating winding (33), so that a second oil channel (35) is formed between the second low-voltage coil group (31), the second high-voltage coil group (32) and the second voltage regulating winding (33).
6. The multi-stage coil structure of an oil transformer according to claim 1, wherein The end insulation rings (4) and the middle insulation rings (9) are formed by layer-by-layer stacking of insulation paper rings and insulation pads.
7. The multi-stage coil structure of an oil transformer according to claim 1, wherein An angle ring (6) is arranged between the end of the winding main body and the transformer core column (1).
8. The multi-stage coil structure of an oil transformer according to claim 1, wherein A plurality of outwardly extending taps (7) are arranged outside the voltage regulating winding.