Tapping area winding structure suitable for continuous high-voltage coil

Abstract

The tapping area winding structure suitable for the continuous high-voltage coil is characterized in that high-voltage windings are arranged on the outer side of the high-voltage coil in a winding mode, the high-voltage windings are arranged at the upper end and the lower end of the high-voltage coil, a high-voltage tapping section is arranged between the high-voltage windings at the upper end and the lower end of the high-voltage coil, and the high-voltage windings are of a cake type coil structure. The high-voltage tapping section is of a double-spiral coil structure, the double-spiral coil structure is a parallel oblique spiral coil, a separation filler strip is arranged on the inner side of a tapping wire outlet end of the double-spiral coil structure, the tapping section adopts a double-spiral transformer, and the high-voltage coil normal section and the tapping section share one winding. And two types of coils are adopted on the common winding, so that the purposes that the number of tapping turns is small, transposition cannot be achieved through a cake type structure, and the cost of the transformer is reduced by adopting a cake type and double-helix combined mode are achieved, the structure is simple, and operation is convenient are achieved.

Description

Technical Field

[0001] This article belongs to the technical field of the tap-changing area of high-voltage coils, and specifically relates to a winding structure for the tap-changing area applicable to continuous high-voltage coils. Background Technique

[0002] In the prior art, due to special requirements of customers, for main transformers with a capacity lower than 20,000 KVA and a voltage of 10 kV class, where the high-voltage coil has a large capacity, a small voltage, and fewer tap-changing turns, to achieve the voltage regulation requirement of ±2×2.5, with fewer tap-changing turns per step, large current, and no voltage regulating coil, according to the traditional design concept,

[0003] Under normal circumstances, the structure of a double-disc coil is adopted. Since the axial height (Hq) of the disc coil is the sum of the heights of the strengthening section (interleaved section or inner shield section), tap-changing section, normal section, special section, etc. of the coil, as well as the sum of the compressed heights of the oil ducts between each section. Therefore, in order to reduce the circulating current loss in the conductor, for a cylindrical coil, when the conductors are connected in parallel along the radial direction by 2, a transposition should be carried out at the 1 / 2 turn number of each layer. However, the transposition increases the axial dimension of the coil by the height of one conductor. Due to the interleaved transposition characteristics of the disc structure, it is impossible to meet the production requirements. Therefore, the tap-changing section of this transformer is wound with a coil with a double-helix structure for the leading-out head method, which not only meets the voltage regulation requirements, but also facilitates production, and at the same time solves the problem of ampere-turn imbalance caused by uneven current in the rated tap-changing area. Content of the Utility Model

[0004] In order to solve the above problems, this article proposes a winding structure for the tap-changing area applicable to continuous high-voltage coils. A high-voltage winding is provided in a winding manner on the outer side of the high-voltage coil. It is characterized in that the high-voltage winding is provided at the upper and lower ends of the high-voltage coil, and a high-voltage tap-changing section is provided between the high-voltage windings at the upper and lower ends. The high-voltage winding is of a disc coil structure, the high-voltage tap-changing section is of a double-helix coil structure, both the high-voltage winding and the high-voltage tap-changing section are continuous coils, the number of turns of each section of the continuous coil is a fractional turn, and the fractional part of the fractional turns of the leading contact section, the trailing end leading-out section, and the normal section of the continuous coil is N - 2 / N. The double-helix coil structure is a parallel oblique spiral coil. A separating gasket is provided inside the tap-changing outgoing line end of the double-helix coil structure. For a transformer with a tap-changing section using a double-helix, the normal section and the tap-changing section of the high-voltage coil share a winding, and two types of coil are used on the shared winding, so as to achieve fewer tap-changing turns. The disc structure cannot achieve transposition. By combining the disc type and the double-helix, the cost of the transformer is reduced, and the structure is simple and the operation is convenient.

[0005] The high-voltage coil is a cylindrical wound coil. The inner center of the high-voltage coil is provided with a transformer iron core. The outer side of the transformer iron core is integrally wound with a high-voltage winding and a high-voltage tap section. The high-voltage winding is a pancake coil structure with horizontal parallelism. Outer baffles are provided on the outer sides of the middle parts of the high-voltage windings at the upper and lower ends of the high-voltage coil. Inner baffles are provided at the bottom of the inner ends of the high-voltage windings at the upper and lower ends of the high-voltage coil. The inner ends of the tap outgoing terminals are combined and connected integrally and are connected through lead ends. Cable ends are provided on the inner sides of the tap outgoing terminals in a parallel outgoing manner. Grouping ends are provided in a separated manner on the outer sides of the leading ends of the cable ends. Separation spacers are provided between the grouping ends. It is necessary to adopt a double-helix structure in the tap section to meet the transposition requirement. The double-helix coil performs unequal-pitch cross transposition. While the transposition makes the conductor not exceed the radial direction and does not affect the main insulation, it can also meet the transposition requirement and facilitate the winding production in the workshop.

[0006] The capacity of the high-voltage coil is below 20,000 KVA. The tap range of the high-voltage coil is a pancake coil within plus or minus 2 * 2.5. It solves the problem that for a pancake coil with a capacity of about 10,000 KVA and a tap range of ±2 * 2.5, the number of turns in the tap section is small, and the pancake structure cannot be used for transposition. Therefore, it is necessary to use a double-helix structure in the coil tap section to achieve transposition and meet the requirement of the voltage regulation range, and the structure is simple and the operation is convenient.

[0007] Beneficial effects:

[0008] For a transformer with a double-helix tap section, the normal section and the tap section of the high-voltage coil share a winding, and two types of coil are used on the shared winding, so as to achieve a small number of tap turns. The pancake structure cannot achieve transposition. By combining the pancake and double-helix methods, the cost of the transformer is reduced, and the structure is simple and the operation is convenient.

[0009] It is necessary to adopt a double-helix structure in the tap section to meet the transposition requirement. The double-helix coil performs unequal-pitch cross transposition. While the transposition makes the conductor not exceed the radial direction and does not affect the main insulation, it can also meet the transposition requirement and facilitate the winding production in the workshop.

[0010] It solves the problem that for a pancake coil with a capacity of about 10,000 KVA and a tap range of ±2 * 2.5, the number of turns in the tap section is small, and the pancake structure cannot be used for transposition. Therefore, it is necessary to use a double-helix structure in the coil tap section to achieve transposition and meet the requirement of the voltage regulation range, and the structure is simple and the operation is convenient. Description of the drawings

[0011] Figure 1 It is a winding schematic diagram of a winding structure applicable to the tap area of a continuous high-voltage coil;

[0012] Figure 2It is a schematic diagram of a simple winding arrangement structure applicable to the tap area winding structure of a continuous high-voltage coil;

[0013] Figure 3 It is a wiring schematic diagram of a tap area winding structure applicable to a continuous high-voltage coil;

[0014] Figure 4 It is a schematic diagram of an existing simple winding arrangement structure;

[0015] Figure 5 It is an existing wiring schematic diagram;

[0016] In the figure: 1. High-voltage winding, 2. High-voltage tap section, 3. Lead end, 4. Tap outgoing terminal, 5. Separation spacer. Specific implementation mode

[0017] In order to deepen the understanding of the present utility model, the present utility model will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present utility model and do not constitute a limitation to the protection scope of the present utility model.

[0018] High-voltage winding 1, high-voltage tap section 2, lead end 3, tap outgoing terminal 4, separation spacer 5.

[0019] Such as Figure 1 、 2 、3 shown;

[0020] A tap-changing area winding structure applicable to a continuous high-voltage coil. The high-voltage winding 1 is arranged in a winding manner on the outer side of the high-voltage coil. It is characterized in that the high-voltage winding 1 is arranged at the upper and lower ends of the high-voltage coil. A high-voltage tap-changing section 2 is arranged between the high-voltage windings 1 at the upper and lower ends. The high-voltage winding 1 is of a pancake coil structure. The high-voltage tap-changing section 2 is of a double-helix coil structure. Both the high-voltage winding 1 and the high-voltage tap-changing section 2 are continuous coils. The number of turns of each section of the continuous coil is a fractional turn. The fractional part of the fractional turns of the first-end contact section, the last-end lead-out section and the normal section of the continuous coil is N-2 / N. The double-helix coil structure is a parallel oblique spiral coil. A separating spacer 5 is arranged inside the tap-changing lead-out end 4 of the double-helix coil structure. The high-voltage coil is a cylindrical winding coil. A transformer core is arranged at the inner center of the high-voltage coil. The high-voltage winding 1 and the high-voltage tap-changing section 2 are integrally wound on the outer side of the transformer core. The high-voltage winding 1 is of a horizontally parallel pancake coil structure. Outer baffles are arranged on the outer sides of the middle parts of the high-voltage windings 1 at the upper and lower ends of the high-voltage coil. Inner baffles are arranged at the inner bottom ends of the high-voltage windings 1 at the upper and lower ends of the high-voltage coil. The capacity of the high-voltage coil is below 20000 KVA. The tap-changing range of the high-voltage coil is a pancake coil within plus or minus 2*2.5. The inner ends of the tap-changing lead-out ends 4 are combined and connected integrally and are connected through a lead end 3. Cable ends are arranged in a parallel and leading-out manner inside the tap-changing lead-out ends 4. Grouping ends are arranged in a separated manner on the outer sides of the leading-out ends of the cable ends. Separating spacers 5 are arranged between the grouping ends.

[0021] Implementation example;

[0022] When the main transformer with fewer tap-changing turns of the high-voltage coil is involved, the characteristic of the pancake structure is a continuous coil wound with ordinary conductors. At the transition between each section, standard transposition is required. However, due to the fewer tap-changing turns, each pancake has only 1.5 turns, with a total of 4 pancakes. Therefore, it is impossible to wind during winding, the transposition pitch is not enough, and the winding transposition requirement cannot be realized. Thus, a double-helix structure needs to be adopted in the tap-changing section to realize the transposition requirement. The double-helix coil performs unequal-distance cross transposition. While the transposition makes the conductor not exceed the radial direction and does not affect the main insulation, it can also realize the transposition requirement and meet the convenience of winding production in the workshop.

[0023] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tapping area winding structure suitable for a continuous high-voltage coil, wherein the high-voltage coil is provided with a high-voltage winding on the outer side of the high-voltage coil, characterized in that: The high-voltage winding is arranged at the upper and lower ends of the high-voltage coil, and a high-voltage tapping section is arranged between the high-voltage windings at the upper and lower ends. The high-voltage winding is a pancake-shaped coil structure, and the high-voltage tapping section is a double spiral coil structure. The high-voltage winding and the high-voltage tapping section are both continuous coils, and the number of turns of each section of the continuous coil is fractional turns. The fractional part of the fractional turns of the head contact section, the end outlet section and the normal section of the continuous coil is N-2 / N. The double spiral coil structure is a parallel oblique spiral coil, and a separation pad is arranged on the inner side of the tapping outlet end of the double spiral coil structure.

2. A tapping area winding structure suitable for a continuous high voltage coil according to claim 1, characterized in that: The high-voltage coil is a cylindrical winding coil, the inner center of the high-voltage coil is provided with a transformer core, and the outer side of the transformer core is provided with a high-voltage winding and a high-voltage tapping section in an integrally wound manner.

3. A tapping area winding structure suitable for a continuous high voltage coil according to claim 1, characterized in that: The high-voltage winding is a transversely parallel pancake coil structure, and outer baffles are provided on the outer side of the middle part of the high-voltage winding at the upper and lower ends of the high-voltage coil, and inner baffles are provided on the bottom of the inner end of the high-voltage winding at the upper and lower ends of the high-voltage coil.

4. A tapping area winding structure suitable for a continuous high voltage coil according to claim 1, characterized in that: The capacity of the high-voltage coil is below 20000KVA, and the tapping range of the high-voltage coil is a pancake coil within plus or minus 2*2.

5.

5. A tapping area winding structure suitable for a continuous high voltage coil according to claim 1, characterized in that: The inner ends of the branch outlet terminals are connected as an integrated whole through lead terminals, the inner sides of the branch outlet terminals are provided with cable terminals in a parallel lead-out manner, the outer sides of the lead-out ends of the cable terminals are provided with group terminals in a separated manner, and separation pads are provided between the group terminals.

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