Oil-immersed insulation mutual inductor body structure for ultra-high voltage power system

Abstract

The utility model relates to an oil-immersed insulation mutual inductor body structure for an ultra-high voltage power system, which comprises a body arranged in a mutual inductor porcelain bushing, the body comprises an iron core, a secondary winding and a primary winding which are sequentially arranged from inside to outside, the secondary winding comprises a plurality of secondary winding coils, and the primary winding comprises a plurality of secondary winding coils. Each secondary winding coil is provided with a plurality of secondary coil winding sections, each secondary winding coil is wound on the iron core, and the secondary coil winding sections on different secondary winding coils are correspondingly overlapped to form a plurality of secondary winding sections; the primary winding comprises a plurality of primary winding sections which are distributed in the height direction of the mutual inductor porcelain bushing and are sequentially connected in series. According to the utility model, the number of the secondary winding coils is increased, so that the application and production of the five-winding open-type iron core mutual inductor become possible.

Description

Technical Field

[0001] The utility model relates to the field of oil-immersed insulating mutual inductors, in particular to an oil-immersed insulating mutual inductor body structure used in an ultra-high voltage power system. Background Art

[0002] In the prior art, various power transmission and transformation equipment used in power lines are gradually extending to the ultra-high voltage and UHV fields. As the number of power-consuming equipment increases, the number of transformer windings required is also increasing. However, due to design, process and other reasons, manufacturers can usually only design and manufacture 2 to 4 windings on the same product.

[0003] According to feedback from domestic and foreign market information, due to the increasing number of expansion, capacity expansion and renovation projects of substations at home and abroad, and the increasingly higher requirements, the domestic and foreign markets have an increasing demand for five-winding transformer products. However, the research and development of five-winding transformers is still in the exploratory stage. Utility Model Content

[0004] The purpose of the utility model is to provide an oil-immersed insulated transformer body structure for an ultra-high voltage power system, which utilizes the secondary coil winding sections of different secondary winding coils in the secondary winding to be correspondingly superimposed on the iron core to form a plurality of secondary winding sections, and increases the number of secondary winding coils through this winding structure, making it possible to apply and put into production a five-winding open-core transformer.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A body structure of an oil-immersed insulated transformer for an ultra-high voltage power system, comprising a body body arranged in a transformer porcelain sleeve, and the body body comprises an iron core, a secondary winding and a primary winding arranged in sequence from the inside to the outside, wherein the secondary winding comprises a plurality of secondary winding coils, and each secondary winding coil is provided with a plurality of secondary coil winding segments, each secondary winding coil is wound on the iron core, and the secondary coil winding segments on different secondary winding coils are correspondingly superimposed to form a plurality of secondary winding segments, and the primary winding comprises a plurality of primary winding segments distributed along the height direction of the transformer porcelain sleeve and sequentially connected in series.

[0007] An insulating cylinder is sleeved on the outer side of the secondary winding, and the primary winding is sleeved on the insulating cylinder.

[0008] The connection terminals on both sides of each secondary winding coil are respectively connected to the corresponding terminals on the secondary terminal box, the head end of the uppermost primary winding segment is connected to the system high voltage A phase, and the end of the lowermost primary winding segment is connected to the ground phase N terminal.

[0009] The secondary winding includes a secondary winding coil I, a secondary winding coil II, a secondary winding coil III, a secondary winding coil IV and a secondary winding coil V, wherein the secondary winding coil I, the secondary winding coil II, the secondary winding coil III and the secondary winding coil IV are each provided with a tail secondary coil winding section and a head secondary coil winding section on one side, and an intermediate secondary coil winding section on the other side, the secondary winding coil V is provided with a secondary coil winding section V, and the secondary winding also includes a tail secondary winding section, an intermediate secondary winding section and a head secondary winding section sequentially sleeved on the iron core, wherein each tail secondary coil winding section is superimposed and wound to form the tail secondary winding section, each head secondary coil winding section is superimposed and wound to form the head secondary winding section, each intermediate secondary coil winding section and the secondary coil winding section V are superimposed and wound to form the intermediate secondary winding section.

[0010] The primary winding includes a plurality of primary winding segment brackets connected in sequence, and each primary winding segment is respectively arranged in a corresponding primary winding segment bracket.

[0011] The core (602) is T-shaped.

[0012] The advantages and positive effects of the utility model are:

[0013] 1. The utility model utilizes the secondary winding sections of different secondary winding coils in the secondary winding to be correspondingly superimposed on the iron core to form a plurality of secondary winding sections, and increases the number of secondary winding coils through this winding structure, making it possible to apply and put into production the five-winding open core mutual inductor.

[0014] 2. The combined structure of the primary winding and the secondary winding of the utility model is thinner and higher than the existing structure, which can increase the contact area with the insulating medium, thereby effectively reducing the temperature rise of the product. At the same time, it optimizes the impact and power frequency voltage distribution in the winding and insulation, improves the ability to withstand impact voltage, and saves space.

[0015] 3. The iron core of the utility model is a T-shaped open structure, which can solve the problem of ferromagnetic resonance of the closed iron core and is convenient for installation.

[0016] 4. The primary winding of the utility model includes a plurality of primary winding sections arranged in sequence along the height direction of the transformer porcelain sleeve. This structure can achieve optimal distribution of voltage along the height direction of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the oil-immersed insulating transformer using the utility model.

[0018] Figure 2 for Figure 1 The enlarged view of H in the figure,

[0019] Figure 3 for Figure 2 Schematic diagram of the structure of the iron core and secondary winding.

[0020] Figure 4 for Figure 3 The winding diagram of the secondary winding is shown in Figure 1.

[0021] Figure 5 for Figure 2 Schematic diagram of the winding of the primary winding.

[0022] Among them, 1 is the secondary winding coil I, 2 is the secondary winding coil II, 3 is the secondary winding coil III, 4 is the secondary winding coil IV, 5 is the secondary winding coil V, 6 is the body of the device, 601 is the secondary winding, 6011 is the tail end secondary winding section, 6012 is the middle secondary winding section, 6013 is the head end secondary winding section, 602 is the iron core, 603 is the primary winding, 6031 is the primary winding section, 6032 is the primary winding section bracket, 7 is the insulating cylinder, 8 is the base, 9 is the secondary terminal box, 10 is the transformer porcelain sleeve, 11 is the expander cover, 12 is the expander, and 13 is the primary terminal. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 5 As shown, the utility model includes a body 6 disposed in a transformer porcelain sleeve 10, and as shown in Figure 2 As shown, the body 6 includes an iron core 602, a primary winding 603, a secondary winding 601 and an insulating cylinder 7, wherein the secondary winding 601 is wound on the outside of the iron core 602, the insulating cylinder 7 is sleeved on the outside of the secondary winding 601, and the primary winding 603 is sleeved on the insulating cylinder 7. Figure 4 As shown, the secondary winding 601 includes a plurality of secondary winding coils, and each secondary winding coil is provided with a plurality of secondary coil winding sections, such as Figure 3 As shown, each secondary winding coil is wound on the core 602, and the secondary coil winding segments on different secondary winding coils are correspondingly superimposed on the core 602 to form a plurality of secondary winding segments, and the terminals on both sides of each secondary winding coil are respectively connected to the corresponding terminals on the secondary terminal box 9. Figure 5As shown, the primary winding 603 includes a plurality of primary winding segments 6031 connected in series, and the head end of the uppermost primary winding segment 6031 is connected to the system high voltage A, and the lowermost primary winding segment 6031 is connected to the ground phase N. The primary winding 603 and secondary winding 601 structures of the utility model are thinner and higher than the existing structures, and the utility model superimposes the secondary coil winding segments of different secondary winding coils to form a plurality of secondary winding segments. This winding method can increase the number of secondary winding coils and the contact area with the insulating medium in the porcelain sleeve 10, which makes it possible to put the five-winding open core mutual inductor into production, and also makes the winding have a larger heat dissipation area, which can effectively reduce the temperature rise of the product, and optimizes the impact and power frequency voltage distribution in the winding and insulation, improves the ability to withstand impact voltage, and saves space.

[0025] like Figures 3-4 As shown, in this embodiment, the secondary winding 601 includes a secondary winding coil I1, a secondary winding coil II2, a secondary winding coil III3, a secondary winding coil IV4 and a secondary winding coil V5, wherein the secondary winding coil I1, the secondary winding coil II2, the secondary winding coil III3 and the secondary winding coil IV4 are each provided with a tail end secondary coil winding section and a head end secondary coil winding section on one side, and a middle secondary coil winding section on the other side, and the secondary winding coil V5 is provided with a separate secondary coil winding section V501, and the other The secondary winding 601 also includes a tail end secondary winding segment 6011, an intermediate secondary winding segment 6012 and a head end secondary winding segment 6013 which are sequentially sleeved on the iron core 602, wherein each tail end secondary coil winding segment is superimposed and wound to form the tail end secondary winding segment 6011, each head end secondary coil winding segment is superimposed and wound to form the head end secondary winding segment 6013, each intermediate secondary coil winding segment and the secondary coil winding segment V501 are superimposed and wound to form the intermediate secondary winding segment 6012.

[0026] Specific as Figure 4 As shown, the secondary winding coil I1 forms a tail end secondary coil winding section I101 and a head end secondary coil winding section I102 on one side, and forms an intermediate secondary coil winding section I103 on the other side; the secondary winding coil II2 forms a tail end secondary coil winding section II201 and a head end secondary coil winding section II202 on one side, and forms an intermediate secondary coil winding section II203 on the other side; the secondary winding coil III3 forms a tail end secondary coil winding section III301 and a head end secondary coil winding section III302 on one side, and forms an intermediate secondary coil winding section III303 on the other side; the secondary winding coil IV4 forms a tail end secondary coil winding section IV401 and a head end secondary coil winding section IV402 on one side, and forms an intermediate secondary coil winding section IV403 on the other side.

[0027] The tail end secondary coil winding section I101 , the tail end secondary coil winding section II201 , the tail end secondary coil winding section III301 and the tail end secondary coil winding section IV401 form a tail end secondary winding section 6011 of the secondary winding 601 .

[0028] The head-end secondary coil winding section I102 , the head-end secondary coil winding section II202 , the head-end secondary coil winding section III302 , and the head-end secondary coil winding section IV402 form a head-end secondary winding section 6013 of the secondary winding 601 .

[0029] The intermediate secondary coil winding segment I103 , the intermediate secondary coil winding segment II203 , the intermediate secondary coil winding segment III303 , the intermediate secondary coil winding segment IV403 and the secondary coil winding segment V501 form an intermediate secondary winding segment 6012 of the secondary winding 601 .

[0030] like Figure 4 As shown, terminals 1a, 1n, 2a, 2n, 3a, 3n, 4a, 4n, 5a, and 5n corresponding to each secondary winding coil are all arranged on the secondary terminal board of the secondary terminal box 9.

[0031] like Figure 5 As shown, the primary winding 603 includes a plurality of primary winding segment brackets 6032 connected in sequence, and each primary winding segment 6031 is respectively arranged in a corresponding primary winding segment bracket 6032. The utility model distributes each primary winding segment 6031 along the height direction of the transformer porcelain sleeve 10, so that the voltage can be optimally distributed along the height direction of the transformer, saving space, and the structure and process are simpler, the cost is also lower, and it also makes it possible to apply and put into production the five-winding open core transformer.

[0032] like Figure 3 As shown, the iron core 602 is a T-shaped open structure, which can solve the problem of ferromagnetic resonance of the closed iron core.

[0033] like Figure 1 As shown, the transformer product adopting the body structure of the utility model also includes an expander 12 arranged at the upper end of the transformer porcelain sleeve 10 and a base 8 arranged at the lower end of the transformer porcelain sleeve 10, wherein the expander 12 is arranged in the expander cover 11, and a primary terminal board 13 is arranged on the upper side of the expander cover 11, and the secondary terminal box 9 is arranged on the base 8, and the transformer porcelain sleeve 10 is filled with transformer oil. The above structures are all well-known technologies in the field.

[0034] In addition, in this embodiment, the coil conductor of the primary winding 603 is an enameled round wire, and the coil conductor of the secondary winding 601 is an enameled rectangular wire.

[0035] The working principle of the utility model is:

[0036] The iron core 602 of the utility model is a T-shaped open structure, which can solve the problem of closed iron core ferromagnetic resonance. The secondary winding 601 is wound on the outside of the iron core, and the secondary coil winding segments of different secondary winding coils in the secondary winding 601 are correspondingly superimposed on the iron core 602 to form multiple secondary winding segments. This winding method can increase the number of secondary winding coils, making it possible to apply and put into production the five-winding open iron core mutual inductor, such as Figure 3 As shown, the secondary winding 601 of the utility model includes five groups of coil windings, namely, secondary winding coil I1, secondary winding coil II2, secondary winding coil III3, secondary winding coil IV4 and secondary winding coil V5, and the primary winding 603 is arranged outside the secondary winding 601, and the primary winding 603 includes a plurality of primary winding segments 6031 arranged along the height direction of the transformer porcelain sleeve 10. This structure can optimize the voltage distribution along the height direction of the transformer. At the same time, compared with the existing structure, the combined structure of the primary winding 603 and the secondary winding 601 is thinner and taller, which can increase the contact area with the insulating medium, thereby effectively reducing the temperature rise of the product, and at the same time optimizes the impact and power frequency voltage distribution in the winding and insulation, improves the ability to withstand impact voltage, and saves space.

Claims

1. An oil-immersed insulated transformer body structure for an ultra-high voltage power system, characterized in that: The invention comprises a body (6) arranged in a transformer porcelain sleeve (10), wherein the body (6) comprises an iron core (602), a secondary winding (601) and a primary winding (603) arranged in sequence from the inside to the outside, wherein the secondary winding (601) comprises a plurality of secondary winding coils, and each secondary winding coil is provided with a plurality of secondary coil winding segments, each secondary winding coil is wound on the iron core (602), and the secondary coil winding segments on different secondary winding coils are correspondingly superimposed to form a plurality of secondary winding segments, and the primary winding (603) comprises a plurality of primary winding segments (6031) distributed along the height direction of the transformer porcelain sleeve (10) and sequentially connected in series.

2. The oil-immersed insulating transformer body structure for an ultra-high voltage power system according to claim 1, characterized in that: An insulating cylinder (7) is sleeved on the outer side of the secondary winding (601), and the primary winding (603) is sleeved on the insulating cylinder (7).

3. The oil-immersed insulated transformer body structure for an ultra-high voltage power system according to claim 1, characterized in that: The connection terminals on both sides of each secondary winding coil are respectively connected to the corresponding terminals on the secondary terminal box (9), the head end of the uppermost primary winding section (6031) is connected to the system high voltage A, and the end of the lowermost primary winding section (6031) is connected to the ground phase N terminal.

4. The oil-immersed insulated transformer body structure for an ultra-high voltage power system according to claim 1, characterized in that: The secondary winding (601) comprises a secondary winding coil I (1), a secondary winding coil II (2), a secondary winding coil III (3), a secondary winding coil IV (4) and a secondary winding coil V (5), wherein the secondary winding coil I (1), the secondary winding coil II (2), the secondary winding coil III (3) and the secondary winding coil IV (4) are each provided with a tail secondary coil winding section and a head secondary coil winding section on one side, and a middle secondary coil winding section on the other side, the secondary winding coil V (5) is provided with a secondary coil winding section V (501), and the secondary winding coil I (1), the secondary winding coil II (2), the secondary winding coil III (3) and the secondary winding coil IV (4) are each provided with a tail secondary coil winding section and a head secondary coil winding section on one side, and a middle secondary coil winding section on the other side, The secondary winding (601) also includes a tail end secondary winding segment (6011), an intermediate secondary winding segment (6012) and a head end secondary winding segment (6013) which are sequentially sleeved on the iron core (602), wherein each tail end secondary coil winding segment is superimposed and wound to form the tail end secondary winding segment (6011), each head end secondary coil winding segment is superimposed and wound to form the head end secondary winding segment (6013), and each intermediate secondary coil winding segment and the secondary coil winding segment V (501) are superimposed and wound to form the intermediate secondary winding segment (6012).

5. The oil-immersed insulated transformer body structure for an ultra-high voltage power system according to claim 1, characterized in that: The primary winding (603) comprises a plurality of primary winding segment brackets (6032) connected in sequence, and each primary winding segment (6031) is respectively arranged in a corresponding primary winding segment bracket (6032).

6. The oil-immersed insulation transformer body structure for an ultra-high voltage power system according to claim 1, characterized in that: The core (602) is T-shaped.

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