Combined structure of high-voltage coil and positive and negative voltage regulating coil

Abstract

The invention relates to a combined structure of a high-voltage coil and a positive and negative voltage regulating coil, and belongs to the technical field of voltage regulation of transformers. The device comprises high-voltage coils, insulating end coils, oil duct cushion blocks, supporting strips, inner and outer baffles, insulating parts and positive and negative adjusting coils, the positive and negative adjusting coils and the high-voltage coils are combined on the same coil, the upper high-voltage coil and the lower high-voltage coil are connected in parallel, one end is connected with a leading-out head wire, and the other end and n leading-out heads led out of the positive and negative adjusting coils are connected into an on-load switch for voltage adjustment. The upper high-voltage coil and the lower high-voltage coil are connected in parallel, one end of the upper high-voltage coil and the lower high-voltage coil after parallel connection is connected with a leading-out head wire, and the other end of the upper high-voltage coil and the other end of the lower high-voltage coil and n leading-out heads led out of the positive and negative voltage regulation coil are connected into the load switch for voltage regulation, so that under the same coil leading-out head number, the voltage regulation range is wider, the process is simple, operation is easy, and the production period of the transformer is shortened; the high-voltage coil is an outer coil and forms a fixed oil way with the inner baffle and the outer baffle through the supporting strips, so that the heat dissipation effect is better, and safety and reliability are achieved.

Description

Technical Field

[0001] The invention relates to a combined structure of a high-voltage coil and a positive and negative voltage regulating coil, belonging to the technical field of transformer voltage regulation. Background Art

[0002] Transformers are devices that use the principle of electromagnetic induction to change AC voltage. With the development of transformer technology, transformers are now more widely used. In order to ensure voltage quality, transformer voltage regulation is usually used to adjust the system voltage accordingly. The voltage regulating coil is an important part of the transformer voltage regulation. Through the function of the voltage regulating coil, the required voltage can be obtained.

[0003] At present, for 35kv transformers, a neutral point voltage regulation coil structure is generally adopted, and the voltage regulation position is set on the neutral point side of the high-voltage coil, and the coil of the transformer is designed as a high-voltage voltage regulation split neutral point voltage regulation structure. In the Chinese patent with application number CN202221592427.1, a high-voltage voltage regulation integrated neutral point voltage regulation coil structure is provided, in which the high-voltage coil and the voltage regulating coil are wound together, and the upper high-voltage coil and the lower high-voltage coil are connected in series, which simplifies the coil structure and makes assembly easier. However, this series connection method makes the voltage regulation range of the voltage regulating coil the same as the number of coil ends. If a larger voltage regulation range is to be increased, a correspondingly larger number of coil ends needs to be increased, which will make the coil winding process complicated, difficult to operate, and reduce the production efficiency of the transformer. Summary of the invention

[0004] The purpose of the present invention is to provide a combination structure of a high voltage coil and a positive and negative voltage regulating coil to solve the problems of many coil ends and complicated winding process when the voltage regulating range is large in the current coil structure.

[0005] In order to solve the above technical problems, the present invention provides a combination structure of a high-voltage coil and a positive and negative voltage regulating coil, including a high-voltage coil, a low-voltage coil, and an iron core. The high-voltage coil is split into an upper high-voltage coil and a lower high-voltage coil along the axial direction, and also includes a positive and negative voltage regulating coil. The upper high-voltage coil and the lower high-voltage coil are connected in parallel, one end of the parallel connection is connected to the lead-out wire, and the other end is connected to the n leads led out of the positive and negative voltage regulating coil and connected to the on-load switch for voltage regulation, and the upper high-voltage coil and the lower high-voltage coil are wound in opposite directions, and n is greater than or equal to 3.

[0006] The present invention connects the upper high-voltage coil and the lower high-voltage coil in parallel, connects one end of the parallel connection to a lead-out line, and connects the other end to n leads led out of the positive and negative voltage regulating coils to a load switch for voltage regulation, thereby achieving a voltage regulation range of 2n-1. Compared with the prior art, the voltage regulation range is wider under the same number of coil leads, the process is simple, easy to operate, and the production cycle of the transformer is shortened.

[0007] Furthermore, the upper high-voltage coil and the lower high-voltage coil adopt a continuous structure.

[0008] Furthermore, the forward and reverse voltage regulating coils adopt a tangled, one-tangled-two-connected or continuous structure.

[0009] Furthermore, it also includes support bars and inner and outer baffles, and the high-voltage coil forms a fixed oil path through the support bars and the inner and outer baffles.

[0010] The high-voltage coil is the outer coil, which forms a fixed oil circuit through the support bars and the inner and outer baffles to achieve better heat dissipation effect.

[0011] Furthermore, it also includes insulating end rings, which are arranged on the upper and lower parts of the coil.

[0012] The insulating end ring can increase the creepage distance of the coil, and compress and fix the high-voltage coil and the voltage regulating coil to ensure that the coil does not bulge outward, thereby increasing the stability of the coil.

[0013] Furthermore, it also includes oil channel pads, which are evenly distributed between the high-voltage coil cakes.

[0014] The oil channel gaskets are evenly distributed between the high-voltage coil cakes, which can support the coil and reduce the temperature rise of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the number of turns of the combined structure of the high-voltage coil and the positive and negative voltage regulating coils of the present invention;

[0016] Figure 2 It is a schematic diagram of the combined structure of the high-voltage coil and the positive and negative voltage regulating coils of the present invention;

[0017] Figure 3 It is a structural diagram of the combined structure of the high-voltage coil and the positive and negative voltage regulating coils of the present invention. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] Embodiment of the combined structure of high voltage coil and positive and negative voltage regulating coil

[0020] The present invention is composed of a high-voltage coil, a positive and negative adjustment coil, a low-voltage coil, and an iron core. The positive and negative adjustment coil and the high-voltage coil are combined in the same coil; Figure 1As shown, the high-voltage coil 1 adopts a continuous structure, is wound in the left direction, and leads to two outlets B and BK; the positive and negative voltage regulating coils adopt a tangled, one-tangled and two-connected or continuous structure, are wound in the left direction, and lead to n outlets; the high-voltage coil 2 adopts a continuous structure, is wound in the right direction, and leads to two outlets BK' and B'; B and B' are connected together as the head line of the high-voltage coil, and BK and BK' are connected together and connected to the on-load switch for voltage regulation with the n outlets led out of the positive and negative voltage regulating coils. The required voltage regulation range is achieved through positive and negative voltage regulation, where n is greater than or equal to 3. The schematic diagram of this structure is shown in Figure 2 As shown, the following is explained with reference to specific examples.

[0021] The upper high-voltage coil is wound in the left direction, and the lower high-voltage coil is wound in the right direction. This winding method is only one of the methods shown in this embodiment. It is only necessary to keep the winding directions of the upper high-voltage coil and the lower high-voltage coil opposite, and the positive and negative voltage regulating coils and the upper high-voltage coil in the same winding direction.

[0022] The BK and BK' of the high voltage coil are connected together with the n outputs of the positive and negative voltage regulating coils to connect to the load switch for voltage regulation, and the voltage regulation range is 2n-1. In this embodiment, the positive and negative voltage regulating coils have 9 outputs B1-B9, and the voltage regulation range is ±8×1.25%.

[0023] The structural diagram of the combination of high voltage coil and positive and negative voltage regulating coil is as follows Figure 3 As shown, the combined structure of the high-voltage coil and the positive and negative voltage regulating coils also includes support bars and inner and outer baffles. The inner baffle is placed at the 1 / 2 position of the coil, and the outer baffle is placed at the 1 / 4 and 3 / 4 positions of the coil. The support bars are evenly distributed inside the high-voltage coil and stuck on the oil channel pad. The high-voltage coil forms a fixed oil path through the support bars and the inner and outer baffles, which makes the heat dissipation effect better.

[0024] The combined structure of the high-voltage coil and the positive and negative voltage regulating coils also includes insulating end rings, which are arranged at the upper and lower parts of the coils. The insulating end rings can increase the creepage distance of the coils, and compress and fix the high-voltage coils and the voltage regulating coils to ensure that the coils do not bulge outwards, thereby increasing the stability of the coils.

[0025] The combined structure of the high-voltage coil and the positive and negative voltage regulating coils also includes oil channel pads, which are evenly distributed between the high-voltage coil cakes to support the coil and reduce the temperature rise of the coil.

[0026] Each phase coil eliminates an independent voltage regulating coil, including the voltage regulating coil's insulating cylinder, stays, oil channel gaskets, insulating end rings, several insulating parts, and the enclosure and stays between the original voltage regulating coil and the high-voltage coil. This reduces the overall size of the transformer and reduces the use of silicon steel sheets, insulating parts, steel and transformer oil. Each transformer can save 2%-3% of the manufacturing cost.

Claims

1. A combination structure of a high-voltage coil and a positive and negative voltage regulating coil, comprising a high-voltage coil, a low-voltage coil, and an iron core, wherein the high-voltage coil is axially split into an upper high-voltage coil and a lower high-voltage coil, characterized in that: It also includes positive and negative voltage regulating coils. The upper high-voltage coil and the lower high-voltage coil are connected in parallel. One end of the parallel connection is connected to the lead-out line, and the other end and the n leads led out of the positive and negative voltage regulating coils are connected to the on-load switch for voltage regulation. The upper high-voltage coil and the lower high-voltage coil are wound in opposite directions, and n is greater than or equal to 3.

2. The combined structure of the high voltage coil and the positive and negative voltage regulating coil according to claim 1 is characterized in that: The upper high-voltage coil and the lower high-voltage coil adopt a continuous structure.

3. The combined structure of the high voltage coil and the positive and negative voltage regulating coil according to claim 1 is characterized in that: The positive and negative voltage regulating coils adopt a tangled, one-tangled and two-connected or continuous structure.

4. The combined structure of the high voltage coil and the positive and negative voltage regulating coil according to any one of claims 1 to 3, characterized in that: It also includes support bars and inner and outer baffles. The high-voltage coil forms a fixed oil path through the support bars and the inner and outer baffles.

5. The combined structure of the high voltage coil and the positive and negative voltage regulating coil according to any one of claims 1 to 3, characterized in that: It also includes insulating end rings, which are arranged on the upper part and the lower part of the coil.

6. The combined structure of the high voltage coil and the positive and negative voltage regulating coil according to any one of claims 1 to 3, characterized in that: It also includes oil channel pads, which are evenly distributed between the high-voltage coil cakes.

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