A test transformer with multi-channel voltage output and a manufacturing method thereof

Abstract

The present invention relates to a test transformer with multi-channel voltage output and a manufacturing method thereof, and belongs to the technical field of transformer manufacturing. The technical scheme is: a plurality of insulating cylinders (2) are arranged in the main air channel between the low-voltage coil (1) and the high-voltage coil (3), forming a mixed insulation structure in which air and insulating cylinders are placed alternately, and the multi-layer windings are wound in layers, and each layer of windings is connected outside the high-voltage coil, and the winding (5) and the dry-type grading switch (7) are connected with a cable (6), and the dry-type grading switch is automatically or manually adjusted to the gear position of the required output voltage. The present invention has multiple functions such as multi-channel output voltage, high voltage level, automatic voltage regulation, etc., has good safety, compact structure, and can conveniently realize the output of the required test voltage; the internal field strength between the low-voltage coil and the high-voltage coil is uniform, the insulation distance of the main air channel is reduced, and the size of the transformer is reduced; the air distance between each layer of windings can be reduced, the footprint is small, and environmental protection requirements are met.

Description

Technical Field

[0001] The invention relates to a test transformer with multi-channel voltage output and a manufacturing method thereof, belonging to the technical field of transformer manufacturing. Background Art

[0002] The test bench for large power transformers is generally built in urban areas or suburbs, and most of the test transformers used are oil-type transformers. With the continuous improvement of national environmental protection policies and requirements, higher requirements are put forward for the safety of equipment. Oil-type transformers need to be replaced with more environmentally friendly dry-type test transformers. However, the test transformer is required to have multiple functions such as multi-channel output voltage, high voltage level, automatic voltage regulation, etc., and at the same time requires higher safety and environmental protection requirements. It is difficult for the existing dry-type transformers to meet the above requirements. Summary of the invention

[0003] The purpose of the present invention is to provide a test transformer with multi-channel voltage output and a manufacturing method thereof, which has multiple functions such as multi-channel output voltage, high voltage level, automatic voltage regulation, good safety, compact structure, and can easily realize the output of required test voltage; the internal field strength between the low-voltage coil and the high-voltage coil is uniform, the insulation distance of the main air channel is shortened, and the size of the transformer is reduced; the air distance between each layer of windings can be reduced, and the outer dimensions of the transformer can be further reduced, the footprint is small, environmental protection requirements are met, and the above-mentioned problems existing in the background technology are solved.

[0004] The technical solution of the present invention is:

[0005] A test transformer with multiple voltage outputs, comprising a low-voltage coil, an insulating cylinder, a high-voltage coil, an iron core, a winding, a cable and a dry-type stepping switch; the low-voltage coil and the high-voltage coil are sequentially sleeved on the iron core from the inside to the outside, and a plurality of insulating cylinders are arranged in the main air channel between the low-voltage coil and the high-voltage coil to form a mixed insulation structure in which air and insulating cylinders are alternately placed, thereby evenly distributing the internal field strength between the low-voltage coil and the high-voltage coil, reducing the insulation distance of the main air channel, and reducing the size of the transformer;

[0006] The winding of the high-voltage coil is composed of a multi-layer winding, and the multi-layer winding wound continuously in the prior art is changed to a multi-layer winding wound in layers, and the connection of each layer of winding in the prior art is changed from being connected inside the high-voltage coil to being connected outside the high-voltage coil, and the lower end of the first layer of winding is connected to the upper end of the second layer of winding outside the high-voltage coil through a wire, and the lower end of the second layer of winding is connected to the upper end of the third layer of winding outside the high-voltage coil through a wire, and so on, so that the voltage difference between adjacent ends of each layer of winding is reduced, the air distance between each layer of winding can be reduced, and the outer size of the transformer can be further reduced;

[0007] The winding outlet and the dry-type grading switch are connected with a cable, and the dry-type grading switch is automatically or manually adjusted to the gear position where the output voltage is required, so that the output of the required test voltage can be easily achieved.

[0008] A method for manufacturing a test transformer with multi-channel voltage outputs is provided, and the test transformer is manufactured according to the test transformer defined above.

[0009] The test transformer with multi-channel voltage output of the present invention is used to replace the oil-immersed transformer in the existing laboratory, so as to meet the requirements of environmental protection and safety; the test transformer with multi-channel voltage output has a high voltage level, adopts multiple insulations to be placed alternately, reduces the size of the main insulation, reduces the product cost, is convenient for on-site replacement and installation, and has multi-channel voltage output. By adjusting the coil structure style, the voltage difference of adjacent coil outputs is reduced, the coil size is reduced, and the dry-type grading switch is automatically or manually adjusted to the gear position where the output voltage is required. The output of the required voltage can be conveniently achieved through the output interface of the dry-type grading switch.

[0010] The beneficial effects of the present invention are as follows: it has multiple functions such as multi-channel output voltage, high voltage level, automatic voltage regulation, good safety, compact structure, and can easily realize the output of the required test voltage; it evens out the internal field strength between the low-voltage coil and the high-voltage coil, shortens the insulation distance of the main air channel, and reduces the size of the transformer; it can reduce the air distance between each layer of windings, further reduce the external dimensions of the transformer, occupy a small area, and meet environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention;

[0012] Figure 2 It is a schematic diagram comparing the present invention with the prior art;

[0013] Figure 3 is a connection diagram of an embodiment of the present invention;

[0014] In the figure: low-voltage coil 1, insulating tube 2, high-voltage coil 3, iron core 4, winding 5, cable 6, dry-type stepping switch 7. DETAILED DESCRIPTION

[0015] The present invention will be further described below by way of embodiments with reference to the accompanying drawings.

[0016] A test transformer with multi-channel voltage output comprises a low-voltage coil 1, an insulating cylinder 2, a high-voltage coil 3, an iron core 4, a winding 5, a cable 6 and a dry-type grading switch 7; the low-voltage coil 1 and the high-voltage coil 3 are sequentially sleeved on the iron core 4 from the inside to the outside, and a plurality of insulating cylinders 2 are arranged in the main air channel between the low-voltage coil 1 and the high-voltage coil 3 to form a mixed insulation structure in which air and insulating cylinders 2 are alternately arranged, so that the internal field strength between the low-voltage coil 1 and the high-voltage coil 3 is uniform, the insulation distance of the main air channel is reduced, and the size of the transformer is reduced;

[0017] The winding 5 of the high-voltage coil 3 is composed of a multi-layer winding, and the multi-layer winding wound continuously in the prior art is changed to a multi-layer winding wound in layers, and the connection of each layer of winding inside the high-voltage coil in the prior art is changed to being connected outside the high-voltage coil 3, and the lower end of the first layer of winding is connected to the upper end of the second layer of winding outside the high-voltage coil 3 through a wire, and the lower end of the second layer of winding is connected to the upper end of the third layer of winding outside the high-voltage coil 3 through a wire, and so on, so that the voltage difference between adjacent ends of each layer of winding is reduced, the air distance between each layer of winding can be reduced, and the outer size of the transformer can be further reduced;

[0018] The output of the winding 5 and the dry-type grading switch 7 are connected with a cable 6, and the dry-type grading switch 7 is automatically or manually adjusted to the gear position where the output voltage is required, so that the output of the required test voltage can be easily achieved.

[0019] A method for manufacturing a test transformer with multi-channel voltage outputs is provided, and the test transformer is manufactured according to the test transformer defined above.

[0020] The test transformer with multi-channel voltage output of the present invention is used to replace the oil-immersed transformer in the existing laboratory, so as to meet the requirements of environmental protection and safety; the test transformer with multi-channel voltage output has a high voltage level, adopts multiple insulations to be placed alternately, reduces the size of the main insulation, reduces the product cost, is convenient for on-site replacement and installation, and has multi-channel voltage output. By adjusting the coil structure style, the voltage difference of adjacent coil outputs is reduced, the coil size is reduced, and the dry-type grading switch is automatically or manually adjusted to the gear position where the output voltage is required. The output of the required voltage can be conveniently achieved through the output interface of the dry-type grading switch.

[0021] In the embodiments, refer to the attached Figure 1 , Figure 1 The main air channel between the medium and low voltage coils 2 and the high voltage coil 3 adopts a mixed insulation structure of air and two insulating cylinders 2 placed alternately, which evens out the internal field strength between high and low voltage, shortens the insulation distance of the main air channel, and reduces the size of the transformer.

[0022] See attached Figure 2 , Figure 2Conventional coils in the prior art are all continuously wound, and the layers of transformer windings are internally connected, resulting in a large voltage gradient. By adjusting the arrangement of the coil structure styles of each layer, the internal wiring of the coil is adjusted to the external wiring of the coil, so that the voltage difference between adjacent outputs can be reduced, and the radial size of the coil can be reduced, thereby further reducing the overall size of the transformer and reducing the space occupied.

[0023] For example: Figure 2 The voltage difference in the middle and lower parts decreases from (30kV-5kV=25kV) to (30kV-15kV=15kV).

[0024] See attached Figure 3 , connect the winding 5 outlet and the dry-type grading switch 7 with a cable 6, and automatically or manually adjust the dry-type grading switch 7 to the gear position where the output voltage is required, so as to conveniently achieve the output of the required voltage.

Claims

1. A method for manufacturing a test transformer with multi-channel voltage output, characterized in that: It comprises a low-voltage coil (1), an insulating cylinder (2), a high-voltage coil (3), an iron core (4), a winding (5), a cable (6) and a dry-type stepping switch (7); The low-voltage coil (1) and the high-voltage coil (3) are sequentially sleeved on the iron core (4) from the inside to the outside, and a plurality of insulating tubes (2) are arranged in the main air channel between the low-voltage coil (1) and the high-voltage coil (3), forming a mixed insulation structure in which air and insulating tubes (2) are alternately arranged, thereby uniformizing the internal field strength between the low-voltage coil (1) and the high-voltage coil (3), reducing the insulation distance of the main air channel, and reducing the size of the transformer; The winding (5) of the high-voltage coil (3) is composed of a plurality of layers of windings, which are wound in layers. The layers of windings are connected outside the high-voltage coil instead of inside the high-voltage coil. The lower end of the first layer of winding is connected to the upper end of the second layer of winding outside the high-voltage coil (3) through a wire, and the lower end of the second layer of winding is connected to the upper end of the third layer of winding outside the high-voltage coil (3) through a wire, and so on. This reduces the voltage difference between adjacent ends of each layer of winding, reduces the air distance between each layer of winding, and further reduces the external dimensions of the transformer. The winding (5) outlet and the dry-type grading switch (7) are connected by a cable (6), and the dry-type grading switch (7) is automatically or manually adjusted to the gear position of the required output voltage, so that the output of the required test voltage can be easily achieved.

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