CN114171304A - 500kV single-phase on-load tap changing autotransformer - Google Patents

500kV single-phase on-load tap changing autotransformer Download PDF

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Publication number
CN114171304A
CN114171304A CN202111477185.1A CN202111477185A CN114171304A CN 114171304 A CN114171304 A CN 114171304A CN 202111477185 A CN202111477185 A CN 202111477185A CN 114171304 A CN114171304 A CN 114171304A
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China
Prior art keywords
coil
voltage
voltage regulating
phase
load tap
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CN202111477185.1A
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Chinese (zh)
Inventor
冯弼乾
冯春玲
安振
王炳光
戴志强
杨万波
李国旗
李琦
周一纯
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Wujiang Transformer Co Ltd
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Wujiang Transformer Co Ltd
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Priority to CN202111477185.1A priority Critical patent/CN114171304A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2876—Cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/346—Preventing or reducing leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/02—Auto-transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H01F2027/2838—Wires using transposed wires

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

The invention discloses a 500kV single-phase on-load tap changing autotransformer, which comprises: two other posts, setting are in iron-cored post between the other post, set gradually by interior outside to low-voltage coil, pressure regulating coil, public coil and series coil on the iron-cored post, the end leading-out terminal of series coil with the first leading-out terminal of public coil is connected, the end leading-out terminal of public coil with the first leading-out terminal or the end leading-out terminal of pressure regulating coil are connected. The invention adopts a neutral point flux-changing voltage-regulating mode on the ultra-large capacity transformer, better meets the power demand, reduces the space occupation and the investment of power grid construction, has simpler structure and better manufacturability, and has good application value in a power grid system.

Description

500kV single-phase on-load tap changing autotransformer
Field of application
The invention relates to the field of transformers, in particular to a 500kV single-phase on-load tap changing autotransformer.
Background
At present, the 500kV transformer in China mostly adopts an excitation-free voltage regulation mode, but in some areas, on-load voltage regulation is needed due to power utilization, a voltage regulation coil is arranged on a side column, an iron core column mainly adopts a single-phase three-column type, a low-voltage coil, a common coil and a series coil are sequentially sleeved on a middle iron core column from inside to outside, and the voltage regulation coil and an excitation coil are sleeved on the side column. The transformer has the disadvantages that an excitation coil is required to be added, the number of turns of the voltage regulating coil is twice that of the voltage regulating coil of the main column, the cost is higher under the same performance parameters, the copper consumption is large, the distances from the middle iron core column to the side columns at two sides are unequal, and the center of gravity is offset.
In order to solve the problems, in the prior art, a voltage regulating coil is wound around a side column and is arranged at the head end of a common coil, namely, constant magnetic flux voltage regulation is realized, however, the voltage regulating lead voltage is high, and the capacity of an on-load tap-changer is limited. In fact, with the rapid development of economy, the demand for electricity is still large, and the capacity of the transformer is increased, but the capacity of the transformer cannot be increased due to the limitation of the capacity of the on-load tap-changer.
Disclosure of Invention
The invention overcomes the defect of limited capacity of an on-load tap-changer in the prior art, provides a 500kV single-phase on-load tap-changer with self-coupling, and adopts the technical scheme that: the utility model provides a single-phase on-load tap changing autotransformer of 500kV which characterized in that includes: two other posts, setting are in iron-cored post between the other post, set gradually by interior outside to low-voltage coil, pressure regulating coil, public coil and series coil on the iron-cored post, the end leading-out terminal of series coil with the first leading-out terminal of public coil is connected, the end leading-out terminal of public coil with the first leading-out terminal or the end leading-out terminal of pressure regulating coil are connected.
In a preferred embodiment of the invention, the voltage level between the voltage regulating coil and the tap changer does not exceed 110 kV.
In a preferred embodiment of the invention, the low-voltage coil, the voltage regulating coil, the common coil and the series coil are all made of self-adhesive transposed conductors.
In a preferred embodiment of the present invention, a plurality of oil guide plates are disposed on each of the low voltage coil, the common coil and the serial coils, and distances between adjacent oil guide plates increase progressively from top to bottom.
In a preferred embodiment of the invention, the low-voltage coil is a spiral end incoming line; the voltage regulating coil is in a double-layer spiral type or double-layer cylinder type; the public coil is a continuous end incoming line, and an electrostatic plate is arranged at the end of a head outgoing line end of the public coil; the series coil is an inner screen continuous middle incoming line, and the upper end and the lower end of the series coil are both provided with electrostatic plates.
In a preferred embodiment of the invention, the bottom of the voltage regulating coil comprises a plurality of branch lines, and the branch lines are divided into two layers.
In a preferred embodiment of the invention, the voltage regulating coil comprises a plurality of voltage regulating wire turns from top to bottom, each voltage regulating wire turn comprises an inner outgoing line end and an outer outgoing line end, two adjacent voltage regulating wire turns are connected with the corresponding outer outgoing line ends through the inner outgoing line ends so as to realize that the plurality of voltage regulating wire turns are connected in series in sequence, and a group of branch lines are led out from the connection position between two adjacent voltage regulating coils.
In a preferred embodiment of the present invention, an upper iron yoke is fixedly disposed on the top of the core leg, a lower iron yoke is disposed on the bottom of the core leg, and the core leg, the upper iron yoke and the lower iron yoke form a magnetic circuit of the transformer; the top of the series coil and the top of the public coil are provided with upper magnetic shields, and the bottom of the series coil and the bottom of the public coil are provided with lower magnetic shields.
In a preferred embodiment of the invention, the inner wall of the oil tank is provided with a plurality of vertical bar magnetic shields which are longitudinally arranged in parallel.
In a preferred embodiment of the present invention, a height difference m is formed between the upper end of the voltage regulating coil and the upper end of the common coil, and a height difference n is formed between the lower end of the voltage regulating coil and the lower end of the common coil, where m is greater than or equal to n.
The invention solves the defects in the background technology, and has the following beneficial effects:
according to the invention, a neutral point variable flux voltage regulation mode is adopted on the ultra-large capacity transformer, so that the single-phase capacity of the 500kV on-load voltage regulation transformer is increased to 500000kVA under the capacity of the existing on-load switch, the power requirement is better met, and the space occupation and the investment of power grid construction are reduced; meanwhile, the problems of loss increase and structural member temperature rise caused by lead magnetic leakage under the non-rated tapping working condition are solved through a reasonable voltage regulating coil outgoing mode, and the problems of transformer capacity increase, loss increase and temperature rise caused by magnetic leakage increase are solved through a magnetic leakage control structure with the matching of the body magnetic shielding and the vertical bar type oil tank magnetic shielding; the problem of coil temperature rise is solved by reasonably selecting the coil wire type and reasonably designing the coil oil way; by reasonably controlling the heights of the public coil and the voltage regulating coil, the insulation requirement of a product is met, and meanwhile, the structure is simpler, the manufacturability is better, and the application value in a power grid system is very good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings of the embodiments can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a coil sleeving of a 500kV single-phase on-load tap changing autotransformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a coil position of a 500kV single-phase on-load tap changing autotransformer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a connection of a 500kV single-phase on-load tap changing autotransformer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a voltage-regulating coil connection of a 500kV single-phase on-load tap-changing autotransformer according to an embodiment of the present invention;
FIG. 5 is a side view of the inside of an oil tank of a 500kV single-phase on-load tap changing autotransformer according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a magnetic shielding assembly of a 500kV single-phase on-load tap-changing autotransformer according to an embodiment of the invention.
The reference numerals are as follows: 101. a side column; 102. a core limb; 201. a low-voltage coil; 202. a voltage regulating coil; 2021. an axial head-out section; 2022. a transverse heading section; 203. a common coil; 204. a series coil; 205. an electrostatic plate; 301. an upper iron yoke; 302. a lower iron yoke; 401. an upper magnetic screen panel; 402. a lower magnetic screen panel; 403. vertical bar magnetic screen panels.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description, wherein the drawings are simplified schematic drawings and only the basic structure of the present invention is illustrated schematically, so that only the structure related to the present invention is shown, and it is to be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
As shown in fig. 1-3, a 500kV single-phase on-load tap changing autotransformer comprises: the transformer comprises two side columns 101, an iron core column 102 arranged between the side columns 101, and a low-voltage coil 201, a voltage regulating coil 202, a common coil 203 and a series coil 204 which are sequentially arranged on the iron core column 102 from inside to outside, wherein the tail outlet end of the series coil 204 is connected with the head outlet end of the common coil 203, and the tail outlet end of the common coil 203 is connected with the head outlet end or the tail outlet end of the voltage regulating coil 202.
Referring to fig. 1 and 3, in the 500kV single-phase on-load autotransformer, the leakage flux of the coil can be well reduced due to the structure of the single-phase three-column core limb 102 on the premise of meeting the technical parameters of the product, so that the stray loss of the transformer is reduced. Therefore, the invention still adopts the structure of the single-phase three-column iron core column 102, but only the middle iron core column 102 is sleeved with the coil, the exciting coil of the original structure is cancelled, the coil sequentially comprises the low-voltage coil 201, the voltage regulating coil 202, the common coil 203 and the series coil 204 from inside to outside, simultaneously the volume of the transformer is reduced, and the cost is obviously reduced. The voltage regulating coil 202 is wound on the iron core column 102, so that firstly, an exciting coil can be omitted, the copper consumption is reduced, the cost is reduced, and the voltage regulating coil 202 is arranged at the tail part of the public coil 203, so that the voltage of the voltage regulating coil 202, the voltage regulating lead and the tap switch is less than 220 kV.
The voltage of the voltage regulating coil 202 and the voltage of the tap switch is at most 110kV, namely, the voltage regulating coil 202, the voltage regulating lead wire and the voltage of the tap switch are reduced to be below 110kV from 220kV in the prior art, the current of the voltage regulating coil 202, the voltage regulating lead wire and the current of the tap switch are the same as that of the common coil 203, the capacity of the transformer is not limited by the capacity of the on-load tap switch any more, the product structure is simpler, and the reliability is higher.
The low-voltage coil 201 is a spiral end incoming wire; the voltage regulating coil 202 is of a double-layer spiral type or a double-layer cylinder type; the common coil 203 is a continuous end incoming line, and the end of a head outgoing line end of the common coil 203 is provided with a static plate 205; the series coil 204 is an inner screen continuous middle incoming line, and the upper end and the lower end of the series coil 204 are both provided with electrostatic plates 205.
Here, specifically, the low voltage coil 201, the common coil 203, and the series coil 204 in the present invention are the same as the line feeding manner in the related art. The voltage regulating coil 202 is in a double-layer spiral type or double-layer cylindrical type, the double-layer spiral type coil has distinct structural characteristics, the head and the tail of the voltage regulating coil extend out of the same end of the coil and are arranged in a U-shaped or U-shaped mode, the voltage regulating coil is divided into an inner layer and an outer layer, and no welding point is connected between the two layers through a lead. For a large-capacity transformer, the double-layer spiral coil can reduce the magnetic leakage density and reduce the stray loss.
The low-voltage coil 201, the voltage regulating coil 202, the common coil 203 and the series coil 204 are all made of self-adhesive transposed conductors. Not shown in the figure, the low-voltage coil 201, the common coil 203 and the series coil 204 are all provided with a plurality of oil guide plates, and the distances between the adjacent oil guide plates increase progressively from top to bottom.
Here, all coils adopt self-adhesion transposition wire, effective control coil axial, radial eddy current loss, effective control coil line oil temperature difference, low-voltage coil 201, common coil 203, series coil 204 all set up the oil guide plate simultaneously, guarantee that the inside oil stream of coil is unobstructed, fine control the temperature rise of coil, and be close to the place of upper end portion more, the quantity that the oil guide plate set up is more, because it is serious more that it generates heat near the upper end portion more, the reliability of oil guide plate in order to increase the transformer operation is led in reasonable setting.
As shown in fig. 5, the bottom of the voltage regulating coil 202 includes a plurality of tap lines, which are divided into two layers.
Specifically, each branch connection line of the voltage regulating coil 202 adopts an inner-outer layered structure at the axial head-out section 2021, and the transverse head-out section 2022 behind the head-out section adopts an upper-lower layered structure, so that the problems of local overheating and increased structural loss caused by current superposition at the head-out position of the voltage regulating coil 202 and in a voltage regulating lead when the transformer is in non-rated tapping operation are solved.
Referring to fig. 4, the voltage regulating coil 202 includes a plurality of voltage regulating wire turns from top to bottom, each voltage regulating wire turn includes an inner outgoing line end and an outer outgoing line end, two adjacent voltage regulating wire turns are connected with the corresponding outer outgoing line end through the inner outgoing line end to realize that the plurality of voltage regulating wire turns are connected in series in sequence, and a group of branch connection lines are led out from the connection between two adjacent voltage regulating coils 202.
That is, in one embodiment of the present invention, the number of turns of the voltage regulating coil 202 is reasonably selected to realize that the inner wire outlet end and the outer wire outlet end of the voltage regulating coil 202 are connected at the same position, for example, the inner wire outlet end 2 and the outer wire outlet end 1 ', the inner wire outlet end 3 and the outer wire outlet end 2 ', the inner wire outlet end 4 and the outer wire outlet end 3 ', the inner wire outlet end 5 and the outer wire outlet end 4 ', the inner wire outlet end 6 and the outer wire outlet end 5 ', the inner wire outlet end 7 and the outer wire outlet end 6 ', the inner wire outlet end 8 and the outer wire outlet end 7 ', the inner wire outlet end 9 and the outer wire outlet end 8 ', and the inner wire outlet end 10 and the outer wire outlet end 9 ' realize the direct connection of the outer and inner coils, so as to avoid the crossing of the voltage regulating wires, the connection between the coil outlet and the lead cable is realized in a limited space, and an enough insulation distance can be ensured without increasing the space between the voltage regulating coil 202 and the lead cable and the safe insulation distance by increasing the distance between the coil and the oil tank.
As shown in FIG. 5, the upper end of the voltage-regulating coil 202 and the upper end of the common coil 203 have a height difference m, and the lower end of the voltage-regulating coil 202 and the lower end of the common coil 203 have a height difference n, where m is greater than or equal to n. Specifically, a certain distance is left between the upper end of the voltage-regulating coil 202 and the upper end of the common coil 203, and between the lower end of the voltage-regulating coil 202 and the lower end of the common coil 203, so that the mutual influence of the end magnetic fields is reduced, and the reliable insulation between the end of the common coil 203 and the voltage-regulating coil 202 is ensured.
An upper iron yoke 301 is fixedly arranged at the top of the iron core column 102, a lower iron yoke 302 is arranged at the bottom of the iron core column 102, and the iron core column 102 is connected with the upper iron yoke 301 and the lower iron yoke 302 by adopting 45-degree oblique seams; the top of the common coil 203 and the series coil 204 is provided with an upper magnetic shield 401, and the bottom of the common coil 203 and the series coil 204 is provided with a lower magnetic shield 402. The inner wall of the oil tank is provided with a plurality of vertical bar magnetic shields 403 which are longitudinally arranged in parallel.
Along with the increase of the capacity of the transformer, the magnetic leakage of the coil is increased, an upper magnetic shield 401 and a lower magnetic shield 402 are arranged at the upper end and the lower end of the coil, and a magnetic leakage control system of a vertical bar magnetic shield 403 is added to provide two paths for the magnetic leakage of the coil, one path is a magnetic leakage loop formed by an upper iron yoke 302, a lower iron yoke 302 and two side yokes through an upper magnetic shield plate 401 and a lower magnetic shield plate 402, and the other path is a loop formed by an upper magnetic shield plate, a lower end magnetic shield and a vertical bar oil tank magnetic shield, so that the problem that the structural part of the iron core column 102 and the structural part of the oil tank are overheated due to the magnetic leakage of the coil is solved.
In conclusion, the invention adopts a neutral point variable flux voltage regulation mode on the ultra-large capacity transformer to realize that the capacity of the 500kV on-load voltage regulation transformer is increased to 500000kVA under the capacity of the existing on-load switch, thereby better meeting the power demand and reducing the space occupation and the investment of power grid construction. Meanwhile, the problems of loss increase and structural member temperature rise caused by lead magnetic leakage under the non-rated tapping working condition are solved through a reasonable voltage regulating coil 202 outgoing mode, and the problems of transformer capacity increase, loss increase and temperature rise caused by magnetic leakage increase are solved through a magnetic leakage control structure with the matching of the body magnetic shielding and the vertical bar type oil tank magnetic shielding; the problem of coil temperature rise is solved by reasonably selecting the coil wire type and reasonably designing the coil oil way; by reasonably controlling the heights of the public coil 203 and the voltage regulating coil 202, the insulation requirement of a product is met, and meanwhile, the structure is simpler, the manufacturability is better, and the application value in a power grid system is very good.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a single-phase on-load tap changing autotransformer of 500kV which characterized in that includes: two other posts, setting are in iron-cored post between the other post, set gradually by interior outside to low-voltage coil, pressure regulating coil, public coil and series coil on the iron-cored post, the end leading-out terminal of series coil with the first leading-out terminal of public coil is connected, the end leading-out terminal of public coil with the first leading-out terminal or the end leading-out terminal of pressure regulating coil are connected.
2. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 1, wherein: the voltage grade between the voltage regulating coil and the tap switch does not exceed 110 kV.
3. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 1, wherein: the low-voltage coil, the voltage regulating coil, the common coil and the series coil are all made of self-adhesive transposed conductors.
4. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 1, wherein: the low-voltage coil, the common coil and the series coils are all provided with a plurality of oil guide plates, and the distances between the adjacent oil guide plates from top to bottom are sequentially increased.
5. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 1, wherein: the low-voltage coil is a spiral end incoming wire; the voltage regulating coil is in a double-layer spiral type or double-layer cylinder type; the public coil is a continuous end incoming line, and an electrostatic plate is arranged at the end of a head outgoing line end of the public coil; the series coil is an inner screen continuous middle incoming line, and the upper end and the lower end of the series coil are both provided with electrostatic plates.
6. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 1, wherein: the bottom of the voltage regulating coil comprises a plurality of branch connecting wires, and the branch connecting wires are divided into two layers.
7. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 6, wherein: the voltage regulating coils comprise a plurality of voltage regulating wire turns from top to bottom, each voltage regulating wire turn comprises an inner outgoing line end and an outer outgoing line end, two adjacent voltage regulating wire turns are connected with the corresponding outer outgoing line ends through the inner outgoing line ends to achieve the sequential series connection of the plurality of voltage regulating wire turns, and a group of branch lines are led out from the connection position between the two adjacent voltage regulating coils.
8. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 1, wherein: an upper iron yoke is fixedly arranged at the top of the iron core column, a lower iron yoke is arranged at the bottom of the iron core column, and the iron core column, the upper iron yoke and the lower iron yoke form a magnetic circuit of the transformer; the top of the series coil and the top of the public coil are provided with upper magnetic shields, and the bottom of the series coil and the bottom of the public coil are provided with lower magnetic shields.
9. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 8, wherein: the inner wall of the oil tank is provided with a plurality of vertical bar magnetic shields which are longitudinally arranged in parallel.
10. The 500kV single-phase on-load tap changing autotransformer as claimed in claim 1, wherein: the upper end of the voltage regulating coil and the upper end of the common coil have a height difference m, the lower end of the voltage regulating coil and the lower end of the common coil have a height difference n, and m is larger than or equal to n.
CN202111477185.1A 2021-12-06 2021-12-06 500kV single-phase on-load tap changing autotransformer Pending CN114171304A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111477185.1A CN114171304A (en) 2021-12-06 2021-12-06 500kV single-phase on-load tap changing autotransformer

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