A double split rectifier transformer

Abstract

The application discloses a double-split rectifier transformer, which comprises an upper yoke, a lower yoke, a main column of an iron core, a high-voltage winding, a low-voltage winding LVD and a low-voltage winding LVY between the upper yoke and the lower yoke; the low-voltage winding LVD is split into a first low-voltage winding LVD and a second low-voltage winding LVD along the width direction; the low-voltage winding LVY is arranged between the first low-voltage winding LVD and the second low-voltage winding LVD; the high-voltage winding is arranged on the width direction outer side of the low-voltage winding LVD and is provided with a grounding shield with the adjacent second low-voltage winding LVD; the end of the high-voltage winding is connected with an incoming line, and the middle part is connected with an unloaded tap line which is led outwards along the width direction. The double-split rectifier transformer provided by the application can avoid the interference between the unloaded tap line and the grounding shield, avoid the risk of voltage breakdown caused by the small insulation distance between the tap line and the grounding shield, save the working hours and improve the production efficiency of the product.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more specifically, to a double-split rectifier transformer. Background Technology

[0002] A rectifier transformer is the power transformer for rectifier equipment. In existing rectifier transformers, the high-voltage intermediate incoming line and the tap-connecting leads must be axially led out from the main channel between the high-voltage and low-voltage sections. This increases the welding time for the leads and prolongs the coil winding period. In addition, although there is a grounding shield between the high-voltage and low-voltage sections, the tap-connecting leads occupy a large portion of the insulation distance of the main channel. This results in insufficient insulation distance between the tap-connecting leads and the grounding shield, leading to breakdown during the withstand voltage test. It is also easy for the tap-connecting leads to breakdown due to insufficient distance between them and the high-voltage coil.

[0003] In summary, how to avoid the problem of long coil winding time and the easy occurrence of withstand voltage breakdown between tap leads and grounding shield is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a double-split rectifier transformer, which has a short winding and manufacturing period and avoids the risk of withstand voltage breakdown caused by the small insulation distance between the high voltage tap lead and the grounding shield.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A double-split rectifier transformer includes an upper yoke, a lower yoke, and a core column. Between the upper yoke and the lower yoke, there are also a high-voltage winding, a low-voltage winding LVD, and a low-voltage winding LVY.

[0007] The low-voltage winding LVD is split radially into a first low-voltage winding LVD and a second low-voltage winding LVD;

[0008] The low-voltage winding LVY is disposed between the first low-voltage winding LVD and the second low-voltage winding LVD;

[0009] The high-voltage winding is located on the radial side of the low-voltage winding LVD, and a grounding shield is provided between it and the adjacent second low-voltage winding LVD. The high-voltage winding has an end wire and a no-load tap wire leading outward from the middle along the radial direction.

[0010] Preferably, the no-load tap is the original conductor lead of the high-voltage winding.

[0011] Preferably, the low-voltage winding LVY has a Y-connection structure.

[0012] Preferably, the first low-voltage winding LVD, the second low-voltage winding LVD, and the low-voltage winding LVY are simultaneously wound, or each is wound separately and then nested together.

[0013] Preferably, the bottom leads of the first low-voltage winding (LVD) and the second low-voltage winding (LVD) are connected in series externally by cold pressing.

[0014] Preferably, the winding directions of the first low-voltage winding LVD and the second low-voltage winding LVD are opposite.

[0015] Preferably, the coil inlet positions of the low-voltage winding LVY, the first low-voltage winding LVD, and the second low-voltage winding LVD are all at the upper or lower ends, and the outlet positions are all at the upper or lower ends.

[0016] Preferably, the low-voltage winding and the lead wire of the low-voltage winding LVY are connected to the sleeve by a cable cold-pressing connection.

[0017] The low-voltage winding (LVD) of the double-split rectifier transformer provided by this invention is split into two parts along the radial direction: a first low-voltage winding (LVD) and a second low-voltage winding (LVD). The low-voltage winding (LVD) is arranged between the first and second low-voltage windings (LVD), and the high-voltage winding is arranged on the outermost side. A grounding shield is provided between the high-voltage winding and the low-voltage winding. The high-voltage winding's input line is located at its end, and the high-voltage tap-out line is located in the middle, in a radial outward direction. Therefore, it achieves insulation distance that does not occupy the main channel and does not interfere with the grounding shield, thus preventing withstand voltage breakdown. It also eliminates the need for complex welding leads. The low-voltage windings, which are split along the radial direction, can be wound simultaneously, reducing welding time and shortening the manufacturing period. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This application provides a structural diagram of a double-split rectifier transformer.

[0020] Figure 1 In the accompanying drawings, the reference numerals include:

[0021] Upper yoke 10, lower yoke 20, core main column 30, low voltage winding LVD40, first low voltage winding LVD40.1, second low voltage winding LVD40.2, low voltage winding LVY50, grounding shield 70, high voltage winding 80, no-load tap 90. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The core of this invention is to provide a double-split rectifier transformer, which has a short winding and manufacturing period, saves manufacturing time, and avoids the risk of breakdown due to the small insulation distance between the grounding shield and the high-voltage tap lead.

[0024] Please refer to Figure 1 , Figure 1 This application provides a structural diagram of a double-split rectifier transformer.

[0025] This application provides a double-split rectifier transformer, which mainly includes an upper yoke 10, a lower yoke 20 and a core column 30 connected between the two. The upper yoke 10 and the lower yoke 20 also include a low-voltage winding and a high-voltage winding 80.

[0026] The low-voltage winding includes the following components:

[0027] The low-voltage winding LVD40 can be connected in a d-connection, splitting into two parts along the radial direction: the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2.

[0028] The low-voltage winding LVY50 can be Y-connected. The low-voltage winding LVY50 is arranged between the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2. The high-voltage winding 80 is D-connected and is arranged on the outermost side. A grounding shield is provided between the high-voltage winding 80 and the low-voltage winding 40.2.

[0029] The high-voltage winding 80 has an end inlet wire and a no-load tap 90 extending outwards along the radial direction from the middle. Since the no-load tap 90 extends outwards, it does not occupy the insulation distance of the main winding, does not interfere with the grounding shield 70, and will not experience withstand voltage breakdown during operation. Complex welding of the leads is unnecessary, and the first low-voltage winding can be wound simultaneously along the radial direction, thus avoiding increased working time.

[0030] The dual-split rectifier transformer provided in this application can avoid interference between the no-load tap 90 and the grounding shield 70 through the above-mentioned settings, thus avoiding the risk of withstand voltage breakdown, saving time, and improving product production efficiency.

[0031] Based on the above embodiment, the no-load tap 90 is the original conductor lead of the high-voltage winding 80. Since the incoming line is located at the end of the high-voltage winding 80 and the outgoing line is located in the middle, the original conductor lead can be used. It is not necessary to weld a copper sheet structure on the no-load tap 90 to form an axial lead-out structure. By using the original conductor to lead out in the radial direction, space and labor time can be saved.

[0032] Alternatively, the original conductor lead may also employ other structures, or additional structures connected to the original conductor lead.

[0033] Please refer to Figure 1 This application provides a Dd0y1 connection mode, therefore a low-voltage winding LVY50 is set between the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2. It should be noted that the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2 are mainly used for d-connection, while the low-voltage winding LVY50 can be a low-voltage coil LVY, mainly used for y1 connection. Optionally, the above connection method can be adjusted according to actual conditions. The purpose of this embodiment is to illustrate the situation where a medium- and low-voltage coil needs to be set.

[0034] Optionally, the first low-voltage winding LVD40.1, the second low-voltage winding LVD40.2, and the low-voltage winding LVY50 can adopt a nested winding structure; they can be wound separately and independently, and then nested together to save time and shorten the construction period.

[0035] The above embodiments provide two different modes, the purpose of which is to show that the solution of this embodiment can be obtained through different manufacturing methods. Therefore, those skilled in the art can also obtain the above structure based on other feasible manufacturing methods in the prior art, all of which are within the protection scope of this application.

[0036] Based on the above embodiments, a suitable turns ratio for the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2 is selected, and suitable wire sizes and insulation distances between coils are adjusted to meet the customer's technical requirements. The impedance value of the high-voltage winding 80 to the low-voltage winding LVD40 is the same as the impedance value of the high-voltage winding 80 to the low-voltage coil LVY50, and the deviation meets the technical requirements.

[0037] by Figure 1For example, in the provided structure, the first low-voltage winding LVD 40.1 on the left can have 13 turns, and the second low-voltage winding LVD40.2 on the right can have 6 turns. Therefore, the number of turns in the low-voltage winding LVD40 is the sum of the first two, i.e., 19 turns. The voltage per turn ET = phase voltage 690V / 19 turns = 36.3158V / turn. The phase voltage of the low-voltage winding LVY50 = 690V / √3 = 398.371V. The number of turns for this winding is calculated as: phase voltage 398.371 / voltage per turn 36.3158V / turn ≈ 11 turns. The rated phase voltage 6600V and turn voltage ET of the high-voltage winding 80 are calculated. The design must ensure that the impedance value of the high-voltage winding 80 to the low-voltage winding LVD40 is the same as the impedance value of the high-voltage winding 80 to the low-voltage winding LVY50, with a guaranteed value of 6.8% and an allowable deviation of ±3%.

[0038] It should be noted that the high-voltage winding 80 is an independently set branch through the end lead-in line, and can adopt a linear voltage regulation method. The decomposition number of the high-voltage winding 80 can be 6, 4, 2, 3, 5, 7.

[0039] Based on the above embodiments, the incoming wire positions of the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2 are both at the upper or lower end, and the outgoing wire positions are both at the upper or lower end.

[0040] Based on any of the above embodiments, the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2 are connected in series at the bottom, and crimp connection lines are led out. Since the two can be connected in the same direction, setting the connection of both at the bottom can avoid interference with the low-voltage winding LVY50 and the grounding shield 70.

[0041] Please refer to Figure 1 In the provided scheme, the winding directions of the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2 are opposite. Specifically, the first low-voltage winding LVD40.1 is wound to the left, and the other second low-voltage winding LVD40.2 is wound to the right. Optionally, the winding direction of the high-voltage winding 80 can be to the right.

[0042] Based on any of the above embodiments, the leads of the first low-voltage winding LVD40.1 and the second low-voltage winding LVD40.2 are connected in series externally by cold pressing and connected to the bushing via cable cold pressing. Specifically, the low-voltage winding LVD40 can be wound with CTC wire, led out from the upper and lower ends of the coil, without the need to weld copper busbars as leads, and connected to the bushing via cable cold pressing.

[0043] The dual-split rectifier transformer provided in this application has a simple structure, which reduces the difficulty of manufacturing, saves time, and ensures the stability of the high and low voltage coils, avoiding the risk of interference and test breakdown.

[0044] In addition to the main structure and connection relationship of the double-split rectifier transformer provided in the above embodiments, the structure of other parts of the double-split rectifier transformer can be found in the prior art, and will not be described in detail here.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0046] The foregoing has provided a detailed description of the double-split rectifier transformer provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A double split rectifier transformer comprising an upper yoke (10), a lower yoke (20), a core limb (30), characterized in that, The upper iron yoke (10) and the lower iron yoke (20) further comprise a high-voltage winding (80), a low-voltage winding LVD (40) and a low-voltage winding LVY (50); The low-voltage winding LVD (40) is in a d connection structure and is split into a first low-voltage winding LVD (40.1) and a second low-voltage winding LVD (40.2) along the width direction; The low-voltage winding LVY (50) is in a y connection structure and is arranged between the first low-voltage winding LVD (40.1) and the second low-voltage winding LVD (40.2); The high-voltage winding (80) is in a D connection structure and is arranged outside the low-voltage winding LVD (40) along the width direction and is provided with a grounding shield between the low-voltage winding LVD (40) and the second low-voltage winding LVD (40.2); the high-voltage winding (80) is provided with an end wire and a middle part leading out a no-load tap line (90) along the width direction, and the no-load tap line (90) is an independently arranged branch; The no-load tap line (90) is a lead wire of the high-voltage winding (80); The first low-voltage winding LVD (40.1), the second low-voltage winding LVD (40.2) and the low-voltage winding LVY (50) are in a simultaneous winding structure or are separately wound and then assembled; The winding directions of the coils of the first low-voltage winding LVD (40.1) and the second low-voltage winding LVD (40.2) are opposite; The lead-out wires of the low-voltage winding (40) and the low-voltage winding LVY (50) are connected to a cable cold-pressing connection sleeve; The coil bottom lead-out wires of the first low-voltage winding LVD (40.1) and the second low-voltage winding LVD (40.2) are externally connected in series by cold pressing.

2. The dual split rectifier transformer of claim 1, wherein, The coil lead-in positions of the low-voltage winding LVY (50), the first low-voltage winding LVD (40.1) and the second low-voltage winding LVD (40.2) are all upper ends or lower ends, and the coil lead-out positions are all upper ends or lower ends.

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