CN109616295B - Capacity-regulating transformer adopting three-phase linear arrangement Dy (Yz) connection method - Google Patents
Capacity-regulating transformer adopting three-phase linear arrangement Dy (Yz) connection method Download PDFInfo
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- CN109616295B CN109616295B CN201910026525.5A CN201910026525A CN109616295B CN 109616295 B CN109616295 B CN 109616295B CN 201910026525 A CN201910026525 A CN 201910026525A CN 109616295 B CN109616295 B CN 109616295B
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- 238000000034 method Methods 0.000 title abstract description 8
- 238000004804 winding Methods 0.000 claims abstract description 175
- 239000011888 foil Substances 0.000 claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 230000001105 regulatory effect Effects 0.000 claims description 8
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000003475 lamination Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- 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
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- 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
- H01F27/2847—Sheets; Strips
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- 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
- H01F27/2847—Sheets; Strips
- H01F27/2852—Construction of conductive connections, of leads
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- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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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
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- 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
- H01F27/2847—Sheets; Strips
- H01F2027/2857—Coil formed from wound foil conductor
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Abstract
The invention belongs to the technical field of electricity, and discloses a three-phase linear arrangement type capacity-regulating transformer adopting a Dy (Yz) connection method, which comprises an iron core, a three-phase capacity-regulating winding and three capacity-regulating switches; each phase of capacity-regulating winding comprises a high-voltage winding coil, a low-voltage winding I section coil and a low-voltage winding II section coil which are arranged in a radial direction, and the low-voltage winding is wound by conductive foil; the low-voltage winding I section coil and the low-voltage winding II section coil form a radial spiral lamination structure, and the two coils are rotationally symmetrical along the axis by 180 degrees; the connection terminals of the capacity-regulating switches are respectively arranged at two sides, and the outgoing lines of the high-voltage winding coil and the low-voltage winding I-section coil and the outgoing lines of the low-voltage winding II-section coil are upwards connected with the capacity-regulating switches from two sides. The outgoing lines of the capacity-regulating transformer are all arranged at the upper part, the connection distance between the outgoing lines and the capacity-regulating switch is short, the length is similar, the three-phase resistance is balanced, the structure is compact, the volume is small, and the manufacturing is simple.
Description
Technical Field
The invention belongs to the technical field of electricity, relates to a capacity-regulating transformer, and particularly relates to a low-voltage side winding wire outlet mode and a capacity-regulating switch placement mode of the capacity-regulating transformer.
Background
The capacity-regulating transformer is a multi-capacity distribution transformer, and mainly utilizes the capacity-regulating switch mounted on the transformer, when the load is light, at the same time, the connection mode of high-voltage winding and low-voltage winding can be changed, and the magnetic flux density in the core of the transformer can be reduced so as to attain the goal of reducing no-load loss of the transformer under the condition of light load.
The principle of the capacity-regulating transformer with the high-capacity coupling group marked Dyn11 and the low-capacity coupling group marked Yzn11 is as follows: each phase of low-voltage winding of the transformer consists of a section I coil and a section II coil, and the number of turns of the section I coil and the number of turns of the section II coil are equal and the sizes of the section I coil and the section II coil are the same; the high voltage winding is a single coil. When the transformer is in high capacity, the three-phase high-voltage windings are connected into a triangle connection, the I-section coil and the II-section coil of each phase low-voltage winding are connected in parallel, and the three phases are connected into a yn connection; when the transformer is in low capacity, three-phase high-voltage windings are connected in star connection, the polarity of the I-section coil of one phase is reversely connected in series with that of the II-section coil of the other adjacent phase, and the three phases are connected in zn connection. The distribution modes of the low-voltage winding I-section coil and the low-voltage winding II-section coil of the existing capacity-regulating transformer are three, wherein one is radial splitting, the other is axial splitting, and the third is a wire mixed winding mode. The radial split has the advantages that the lengths of the outgoing lines of the two sections of coils are equivalent, and the defects that the radial positions of the two sections of coils are different, the magnetic field environments are greatly different, the total lengths of the two sections of coils are different, the voltages at the two ends of the two coils are different, and when the two coils are connected in parallel, circulation loss can be generated. The axial splitting has the advantages that the radial positions of the two sections of coils are the same, and the two sections of coils can have the same total circumference, conductive section, resistance and magnetic field environment; the length of the outgoing line of the section of coil far away from the capacity-regulating switch is obviously longer than that of the outgoing line of the section of coil close to the capacity-regulating switch, which is unfavorable for the resistance balance of the two sections of coils. In addition, the two coils need to be separated by a distance in the axial direction. The wire-type mixed winding mode is that the wires of two sections of coils are respectively overlapped, and then the two stacks of wires are adjacent axially and are wound on the iron core. The method has the advantages of transposition width and helix angle, low window filling coefficient, unbalanced ampere turn distribution and poor short circuit resistance.
Disclosure of Invention
In order to solve the problem of the winding structure of the I-section coil and the II-section coil of the low-voltage winding in the existing capacity-regulating transformer adopting the Dy (Yz) connection method, the invention selects a foil type mixed winding scheme for winding the low-voltage winding, in the scheme, the I-section coil and the II-section coil are axially overlapped and radially overlapped and mixed, and the I-section coil and the II-section coil are rotationally symmetrical along the axis of 180 degrees.
The foil type mixed winding scheme is characterized in that: the outgoing lines of the I-section coil and the II-section coil are not on the same side of the winding, namely the outgoing line of one section of coil is on the same side as the outgoing line of the high-voltage winding coil. The three-phase linear arrangement type capacity-regulating transformer based on the foil type mixed winding scheme is adopted, if the existing three-phase integrated capacity-regulating switch is adopted, the length direction of the capacity-regulating switch is arranged along the upper yoke of the iron core, and the high-voltage wiring terminal and the low-voltage wiring terminal of the capacity-regulating switch are respectively arranged at two sides in the width direction, and then the outgoing line of the low-voltage winding I-section coil of the capacity-regulating winding is positioned at one side of the outgoing line of the high-voltage winding coil, so that the outgoing line of the low-voltage winding I-section coil needs to penetrate from one side to the other side above the upper yoke of the iron core and then is connected with the capacity-regulating switch. On one hand, enough wiring space is reserved between the capacity-adjusting switch and the upper yoke of the iron core, so that the volume of the transformer is enlarged; on the other hand, the wiring processing procedure and the wiring difficulty of the outgoing line are increased; in a third aspect, more material costs of the pinout are required; in the fourth aspect, the outgoing line of the coil of the section I of the low-voltage winding is obviously longer than the outgoing line of the coil of the section II which can be directly connected with the capacity-regulating switch upwards, so that the unbalanced resistance rate of the coils of the two sections is increased.
In contrast, the invention provides a three-phase linear arrangement type capacity-regulating transformer specially designed for the foil type mixed winding capacity-regulating winding, wherein the capacity-regulating transformer adopts a Dyn11 connection method when the capacity is high, and adopts a Yzn11 connection method when the capacity is low. It is characterized by comprising an iron core, three-phase capacity-regulating windings and three relatively independent capacity-regulating switches respectively used for controlling the conversion of the coil connection structure of the three-phase capacity-regulating windings, wherein three-phase iron core columns of the iron core are arranged side by side in a straight line, the three-phase capacity-regulating windings are respectively sleeved on the three-phase iron core columns,
Each phase of capacity-regulating winding comprises a high-voltage winding coil, a low-voltage winding I section coil and a low-voltage winding II section coil which are arranged in a radial direction; the high-voltage winding coil, the low-voltage winding I-section coil and the low-voltage winding II-section coil are overlapped in axial positions, and the low-voltage winding I-section coil and the low-voltage winding II-section coil are wound by metal foils with the same size; two ends of each coil are respectively connected with an outgoing line, and the outgoing lines of all coils extend out in the same axial direction; the outgoing line of the low-voltage winding I section coil is positioned on a first side of the winding, the outgoing line of the low-voltage winding II section coil is positioned on a second side of the winding opposite to the first side, and the outgoing line of the high-voltage winding coil can be positioned on the first side or the second side; the number of turns of the coil of the section I of the low-voltage winding is equal to that of the coil of the section II of the low-voltage winding, the coil of the section I of the low-voltage winding and the coil of the section II of the low-voltage winding are connected in parallel in each phase when the capacity is high through a capacity-regulating switch, and three phases are connected into yn connection again; when the capacity is low, the polarity of the coil I of one phase is reversely connected with the polarity of the coil II of the other adjacent phase in series, and the three phases are connected in zn again; the low-voltage winding I-section coil and the low-voltage winding II-section coil form a spiral laminated structure in the radial direction, and are rotationally symmetrical along the axis by 180 degrees;
the three capacity-regulating switches are respectively arranged above the iron core upper yoke and correspond to the positions of the three-phase capacity-regulating windings, the wiring terminals of each capacity-regulating switch are respectively arranged at two sides of the width direction of the wiring terminals, and the length direction of each capacity-regulating switch is perpendicular to the arrangement direction of the three-phase capacity-regulating windings;
The first side and the second side of the capacity-regulating winding respectively correspond to the two sides of the upper yoke of the iron core; and the outgoing line which is required to be connected with the capacity-regulating switch in the low-voltage winding I section coil positioned at the first side of the capacity-regulating winding, the outgoing line which is required to be connected with the capacity-regulating switch in the low-voltage winding II section coil positioned at the second side, and the outgoing line which is required to be connected with the capacity-regulating switch in the high-voltage winding coil positioned at the first side or the second side are respectively upwards connected with the capacity-regulating switch from two sides of the upper yoke of the iron core.
Further, the high-voltage winding coil, the low-voltage winding coil I section and the low-voltage winding coil II section are sequentially arranged from outside to inside in radial direction.
Further, the lead-out wire of the low-voltage winding includes a welded segment welded to the metal foil and a lead-out wire segment protruding from the coil.
And the two outgoing lines of the low-voltage winding I-section coil and the two outgoing lines of the low-voltage winding II-section coil are rotationally symmetrical along the axis of the winding by 180 degrees.
Further, the first side of the adjuster Rong Kaiguan includes a vacuum arc-extinguishing chamber Kd1, a vacuum arc-extinguishing chamber Kdc, a vacuum arc-extinguishing chamber Kdg, a vacuum arc-extinguishing chamber Kd2, a first wiring pin, a second wiring pin, and a third wiring pin; the first wiring pin links to each other with the first wiring end of vacuum interrupter Kd1, the first wiring end of vacuum interrupter Kdc respectively, and the second wiring pin links to each other with the first wiring end of vacuum interrupter Kdg, and the third wiring end links to each other with the first wiring end of vacuum interrupter Kd 2.
The second side of the capacity-regulating switch comprises a vacuum arc-extinguishing chamber Kgc, a vacuum arc-extinguishing chamber Kg1, a vacuum arc-extinguishing chamber Kgg, a vacuum arc-extinguishing chamber Kd3, a fourth wiring pin, a fifth wiring pin and a sixth wiring pin, wherein the fourth wiring pin is connected with a first wiring end of the vacuum arc-extinguishing chamber Kgc, the fifth wiring pin is connected with a first wiring end of the vacuum arc-extinguishing chamber Kg1, the sixth wiring pin is connected with a first wiring end of the vacuum arc-extinguishing chamber Kd3, the fifth wiring pin is electrically connected with a first wiring end of the vacuum arc-extinguishing chamber Kgg, a second wiring end of the vacuum arc-extinguishing chamber Kgc is connected with a second wiring end of the vacuum arc-extinguishing chamber Kgg, the first wiring end of the vacuum arc-extinguishing chamber Kgc is connected with a first wiring end of an adjacent phase vacuum arc-extinguishing chamber Kgc, and the second wiring end of the vacuum arc-extinguishing chamber Kg1 is connected with an adjacent phase high voltage output end.
Further, a first outgoing line of the low-voltage winding I-section coil is connected with a first wiring pin, and a second outgoing line of the low-voltage winding I-section coil is connected with a third wiring pin; the first outgoing line of the low-voltage winding II-section coil is connected with the low-voltage output end of the capacity-regulating transformer, and the second outgoing line of the low-voltage winding II-section coil is connected with the sixth wiring pin; the first wiring end of the vacuum arc-extinguishing chamber Kd1 is connected with the first wiring end of the vacuum arc-extinguishing chamber Kdc, and the second wiring end of the vacuum arc-extinguishing chamber Kd1 is connected with the low-voltage output end of the capacity-regulating transformer; the second wiring end of the vacuum arc-extinguishing chamber Kdc is connected with the first wiring end of the vacuum arc-extinguishing chamber Kdg; the first wiring of the vacuum arc-extinguishing chamber Kd2 is connected with the first wiring of the adjacent phase vacuum arc-extinguishing chamber Kd3, and the second wiring of the vacuum arc-extinguishing chamber Kd2, the vacuum arc-extinguishing chamber Kdg and the vacuum arc-extinguishing chamber Kd3 is connected with the zero line.
The first outgoing line of the high-voltage winding coil is connected with a first wiring terminal of the vacuum arc-extinguishing chamber Kg1, and the second outgoing line of the high-voltage winding coil is connected with a second wiring terminal of the adjacent vacuum arc-extinguishing chamber Kg 1.
The invention has the beneficial effects that: 1. through designing the I section coil of the low-voltage winding and the II section coil of the low-voltage winding into 180-degree rotationally symmetrical structures, the lengths of outgoing lines of the two coils are kept consistent, the geometric parameters of the two coils are guaranteed to be completely consistent, the magnetic field environment is the same, the structure is compact, the volume is small, the manufacture is simple, the short circuit resistance of the transformer is effectively improved, the generation of circular current in the two coils is avoided, and the unbalance rate of the three-phase resistor is effectively reduced to the minimum. 2. The single-phase independent capacity-regulating switch is adopted, the arrangement mode that the length direction of the capacity-regulating switch is perpendicular to the arrangement direction of the three-phase capacity-regulating winding is adopted, and the structure of double-side outgoing lines of the low-voltage copper bar is matched, so that the length and redundant bending and bending of outgoing lines are effectively reduced, the processing technology of the outgoing lines is simplified, the materials required by the outgoing lines are saved, the production cost is saved, and the volume of the capacity-regulating transformer is reduced.
Drawings
Fig. 1 is a schematic diagram of a phase-modulating winding of a capacity-modulating transformer according to the present invention;
FIG. 2 is a schematic diagram of a capacity-adjusting switch according to the present invention;
Fig. 3 is a schematic diagram of a wiring mode of a first group of vacuum interrupters in the present invention;
fig. 4 is a circuit diagram of the low voltage side of the regulating transformer at low capacity;
Fig. 5 is a circuit diagram of the low voltage side of the capacity regulating transformer at high capacity;
FIG. 6 is a schematic diagram of a wiring scheme of a second group of vacuum interrupters in the present invention
Fig. 7 is a circuit diagram of the high voltage side of the regulating transformer at low capacity;
Fig. 8 is a circuit diagram of the high voltage side of the capacity regulating transformer at high capacity;
In the figure: the symbol 'day' indicates that the vacuum arc-extinguishing chamber is in a closing state, and the symbol 'mesh' indicates that the vacuum arc-extinguishing chamber is in a separating state; rd represents the transition resistance.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below by means of specific embodiments in conjunction with the accompanying drawings.
In order to enable those skilled in the art to better understand the present invention, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the embodiments described below are only some, but not all, embodiments of the invention.
Referring to fig. 1, this example shows a one-phase capacity-regulating winding structure of a three-phase capacity-regulating transformer, which includes a high-voltage winding coil, a low-voltage winding i-section coil, and a low-voltage winding ii-section coil sequentially arranged from outside to inside in radial direction; the low-voltage winding I section coil and the low-voltage winding II section coil are formed by winding metal foils, and the high-voltage winding coil is formed by winding metal wires.
Specifically, the coil I and the coil II in the low-voltage winding form a spiral laminated structure, the spiral laminated structure is rotationally symmetrical along the center 180 degrees of the iron core, the winding comprises a first metal foil 2 used for winding the coil I, a first insulating layer 20, a first lead-out wire 21 of the coil I, a second lead-out wire 22 of the coil I, a second metal foil 3 used for winding the coil II, a second insulating layer 30, a first lead-out wire 31 of the coil II and a second lead-out wire 32 of the coil II.
The specific winding mode of the low-voltage winding is as follows:
Sleeving a low-voltage winding insulating paperboard cylinder on a winding die, and respectively pulling and conveying the end part of a first metal foil for winding a section I coil and the end part of a second metal foil for winding a section II coil to the winding die from two opposite directions; the end part of the first metal foil is welded with a first lead-out wire 21 of the first section of coil, the inner side of the first metal foil is attached with a first insulating layer 20, the end part of the second metal foil is welded with a first lead-out wire 31 of the second section of coil, and the inner side of the second metal foil is attached with a second insulating layer 30; the end part of the first metal foil is fixed on a first side of the winding die through a first outgoing line of the section I coil, and the end part of the second metal foil is fixed on a second side, opposite to the first side, of the winding die through a copper bar of a first outgoing line 31 of the section II coil;
And secondly, rotating the winding die, synchronously winding the first metal foil and the second metal foil with equal length on the insulating paperboard cylinder to form a coil I and a coil II which are mutually in a spiral laminated structure, cutting the first metal foil and the second metal foil on the first side and the second side of the winding die respectively when the target turns are reached, and welding a coil I second outgoing line 22 and a coil II second outgoing line 32 on new ends of the first metal foil and the second metal foil respectively. And obtaining a spiral mixed coil formed by combining the I-section coil and the II-section coil, and obtaining the low-voltage winding of the capacity-regulating transformer.
The outgoing line of the low-voltage winding I section coil is positioned on a first side of the winding, and the outgoing line of the low-voltage winding II section coil is positioned on a second side of the winding opposite to the first side. The high-voltage winding coil is wound by a metal wire 200, and has a high-voltage winding coil first outgoing line 201, a high-voltage winding coil second outgoing line 202 and a high-voltage insulating layer 203. The outgoing line of the high-voltage winding coil and the outgoing line of the low-voltage winding I-section coil are positioned on the first side of the winding.
As shown in fig. 2, the connection terminals of the capacity-adjusting switch are respectively arranged at two sides of the width direction of the capacity-adjusting switch, and the length direction of the capacity-adjusting switch is perpendicular to the arrangement direction of the three-phase capacity-adjusting windings;
As shown in fig. 3, in the first group of connection modes of the vacuum arc-extinguishing chambers, the vacuum arc-extinguishing chambers Kd1 are shown, the lower end of the vacuum arc-extinguishing chambers Kd is provided with a first connection pin 40 and a first connection terminal 41, and the upper end of the vacuum arc-extinguishing chambers Kd is provided with a second connection terminal 42; the vacuum interrupter Kdc has a first wiring terminal 51 at the lower end and a second wiring terminal 52 at the upper end, a second wiring pin 60 and a first wiring terminal 61 at the lower end and a second wiring terminal 62 at the upper end; the vacuum interrupter Kd2 has a third terminal pin 70 and a first terminal 71 at the lower end and a second terminal 72 at the upper end.
The low-voltage side circuit diagrams shown in fig. 4 and 5 illustrate the upper left-hand winding and the upper right-hand winding.
The wiring of the outgoing line and the vacuum arc-extinguishing chamber in the capacity-regulating switch is as follows:
As shown in the circuit diagrams of fig. 4 and 5, a first outgoing line of the section I coil of the low-voltage winding is connected with a first wiring pin, and a second outgoing line of the section I coil of the low-voltage winding is connected with a third wiring pin; the first outgoing line of the low-voltage winding II-section coil is connected with the low-voltage output end of the capacity-regulating transformer, and the second outgoing line of the low-voltage winding II-section coil is connected with the sixth wiring pin; the first wiring end of the vacuum arc-extinguishing chamber Kd1 is connected with the first wiring end of the vacuum arc-extinguishing chamber Kdc, and the second wiring end of the vacuum arc-extinguishing chamber Kd1 is connected with the low-voltage output end of the capacity-regulating transformer; the second wiring end of the vacuum arc-extinguishing chamber Kdc is connected with the first wiring end of the vacuum arc-extinguishing chamber Kdg; the first wiring of the vacuum arc-extinguishing chamber Kd2 is connected with the first wiring of the adjacent phase vacuum arc-extinguishing chamber Kd3, and the second wiring of the vacuum arc-extinguishing chamber Kd2, the vacuum arc-extinguishing chamber Kdg and the vacuum arc-extinguishing chamber Kd3 is connected with the zero line.
Referring to fig. 6, a second group of vacuum interrupters are connected in a wiring manner, which illustrates a vacuum interrupter Kgc, wherein the lower end of the vacuum interrupter is provided with a fourth wiring pin 80 and a first wiring terminal 81, and the upper end of the vacuum interrupter is provided with a second wiring terminal 82; the vacuum arc extinguishing chamber Kg1 has a fifth wiring pin 90 and a first wiring terminal 91 at the lower end and a second wiring terminal 92 at the upper end; the vacuum arc-extinguishing chamber Kgg has a first wiring terminal 101 at the lower end and a second wiring terminal 102 at the upper end; the vacuum arc-extinguishing chamber Kg3 has a sixth wiring pin 73 and a first wiring terminal 74 at the lower end and a second wiring terminal 75 at the upper end.
As shown in the circuit diagram of fig. 7, the first lead wire of the high-voltage coil is connected to the first terminal of Kg1, and the second lead wire of the high-voltage coil is connected to the high-voltage output terminal. The fourth wiring pin connects vacuum interrupter's Kgc first wiring terminal, and the fifth wiring pin connects vacuum interrupter's Kg1 first wiring terminal, and the sixth wiring pin connects vacuum interrupter's Kg3 first wiring terminal, and the fifth wiring pin is connected with Kgg's first wiring terminal electricity, and Kgc's second wiring terminal is connected with Kgg second wiring terminal, and Kg 1's second wiring terminal connects adjacent phase high voltage coil output.
In order to realize capacity adjustment of the capacity-adjusting transformer, as shown in fig. 4, vacuum arc-extinguishing chambers Kd1, kd2 and Kd3 are opened, and vacuum arc-extinguishing chambers Kgg and Kgc are closed, and are in a low-capacity state at the moment; as shown in fig. 5, the vacuum arc-extinguishing chambers Kd1, kd2 and Kd3 are changed from open to closed, and the vacuum arc-extinguishing chambers Kgg and Kgc are changed from closed to open, at the same time, as shown in fig. 7 and 8, the star-delta conversion is also completed at the high voltage side, so that the capacity-regulating transformer is changed from a low capacity state to a high capacity state.
Claims (5)
1. The capacity-regulating transformer is characterized by comprising an iron core, three-phase capacity-regulating windings and three relatively independent capacity-regulating switches respectively used for controlling the conversion of the coil connection structure of the three-phase capacity-regulating windings, wherein three-phase iron core columns of the iron core are arranged in parallel in a straight line, and the three-phase capacity-regulating windings are respectively sleeved on the three-phase iron core columns;
Each phase of capacity-regulating winding comprises a high-voltage winding coil, a low-voltage winding I section coil and a low-voltage winding II section coil which are arranged in a radial direction; the high-voltage winding coil, the low-voltage winding I-section coil and the low-voltage winding II-section coil are overlapped in axial center lines, and the low-voltage winding I-section coil and the low-voltage winding II-section coil are wound by metal foils with the same size; two ends of each coil are respectively connected with an outgoing line, and the outgoing lines of all coils are led out in the same axial direction; the outgoing line of the low-voltage winding I section coil is positioned on a first side of the winding, the outgoing line of the low-voltage winding II section coil is positioned on a second side of the winding opposite to the first side, and the outgoing line of the high-voltage winding can be positioned on the first side or the second side; the number of turns of the low-voltage winding I section coil and the low-voltage winding II section coil are equal and the sizes of the low-voltage winding I section coil and the low-voltage winding II section coil are the same, the low-voltage winding I section coil and the low-voltage winding II section coil are connected in parallel in each phase when the high capacity is realized through a capacity-regulating switch, and three phases are connected into yn connection again; when the capacity is low, the polarity of the coil I of one phase is reversely connected with the polarity of the coil II of the other adjacent phase in series, and the three phases are connected into zn connection; the low-voltage winding I-section coil and the low-voltage winding II-section coil form a spiral laminated structure, and the two coils are rotationally symmetrical along the axis by 180 degrees;
the three capacity-regulating switches are respectively arranged above the iron core upper yoke and correspond to the positions of the three-phase capacity-regulating windings, the high-voltage wiring terminal and the low-voltage wiring terminal of each capacity-regulating switch are respectively arranged at two sides of the width direction of the capacity-regulating switch, and the length direction of each capacity-regulating switch is perpendicular to the arrangement direction of the three-phase capacity-regulating windings;
The first side and the second side of the capacity-regulating winding respectively correspond to the two sides of the upper yoke of the iron core; the lead-out wire which is needed to be connected with the capacity-regulating switch in the section I coil of the low-voltage winding and is positioned at the first side of the capacity-regulating winding, the lead-out wire which is needed to be connected with the capacity-regulating switch in the section II coil of the low-voltage winding and is positioned at the second side of the capacity-regulating winding, and the high-voltage lead-out wire which is needed to be connected with the capacity-regulating switch and can be positioned at the first side or the second side of the high-voltage winding are respectively upwards connected with the capacity-regulating switch from two sides of the upper yoke of the iron core;
The high-voltage winding coil, the low-voltage winding coil I section and the low-voltage winding coil II section are sequentially arranged from outside to inside in radial direction;
The lead-out wire of the low-voltage winding comprises a welded section welded with the metal foil and a lead-out wire section extending from the coil.
2. The three-phase in-line Dy (Yz) connected capacity regulating transformer of claim 1, wherein the two outgoing lines of the low-voltage winding i-section coil and the two outgoing lines of the low-voltage winding ii-section coil are rotationally symmetric by 180 degrees along the winding axis.
3. The three-phase in-line Dy (Yz) connected capacity regulating transformer of claim 1, wherein the first side of the regulator Rong Kaiguan comprises a vacuum interrupter Kd1, a vacuum interrupter Kdc, a vacuum interrupter Kdg, a vacuum interrupter Kd2, and first, second, and third wire pins; the first wiring pin is connected with a first wiring terminal of the vacuum arc-extinguishing chamber Kd1 and a first wiring terminal of the vacuum arc-extinguishing chamber Kdc, the second wiring pin is connected with a first wiring terminal of the vacuum arc-extinguishing chamber Kdg, and the third wiring terminal is connected with a first wiring terminal of the vacuum arc-extinguishing chamber Kd 2;
The second side of the capacity-regulating switch comprises a vacuum arc-extinguishing chamber Kgc, a vacuum arc-extinguishing chamber Kg1, a vacuum arc-extinguishing chamber Kgg, a vacuum arc-extinguishing chamber Kd3, a fourth wiring pin, a fifth wiring pin and a sixth wiring pin, wherein the fourth wiring pin is connected with a first wiring end of the vacuum arc-extinguishing chamber Kgc, the fifth wiring pin is connected with a first wiring end of the vacuum arc-extinguishing chamber Kg1, the sixth wiring pin is connected with a first wiring end of the vacuum arc-extinguishing chamber Kd3, and the fifth wiring pin is electrically connected with a first wiring end of the vacuum arc-extinguishing chamber Kgg.
4. The three-phase in-line Dy (Yz) connected capacity regulating transformer according to claim 3, wherein a first lead wire of the low-voltage winding i-section coil is connected to the first connection pin, and a second lead wire of the low-voltage winding i-section coil is connected to the third connection pin; the first outgoing line of the low-voltage winding II-section coil is connected with the low-voltage output end of the capacity-regulating transformer, and the second outgoing line of the low-voltage winding II-section coil is connected with the sixth wiring pin; the first wiring end of the vacuum arc-extinguishing chamber Kd1 is connected with the first wiring end of the vacuum arc-extinguishing chamber Kdc, and the second wiring end of the vacuum arc-extinguishing chamber Kd1 is connected with the low-voltage output end of the capacity-regulating transformer; the second wiring end of the vacuum arc-extinguishing chamber Kdc is connected with the first wiring end of the vacuum arc-extinguishing chamber Kdg; the first wiring of the vacuum arc-extinguishing chamber Kd2 is connected with the first wiring of the adjacent phase vacuum arc-extinguishing chamber Kd3, and the second wiring of the vacuum arc-extinguishing chamber Kd2, the vacuum arc-extinguishing chamber Kdg and the vacuum arc-extinguishing chamber Kd3 is connected with the zero line.
5. A three-phase in-line Dy (Yz) connected capacity regulating transformer as claimed in claim 3, wherein the first lead of the high voltage winding coil is connected to the first terminal of the vacuum interrupter Kg1, the second lead of the high voltage winding coil is connected to the second terminal of the vacuum interrupter Kg1 of the adjacent phase, the second terminal of the vacuum interrupter Kgc is connected to the second terminal of the vacuum interrupter Kgg, the first terminal of the vacuum interrupter Kgg is connected to the first terminal of the vacuum interrupter Kg1, and the first terminal of the vacuum interrupter Kgc is connected to the first terminal of the vacuum interrupter Kgc of the other two phases.
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| CN209312564U (en) * | 2019-01-11 | 2019-08-27 | 浙江宝威电气有限公司 | A kind of capacitance-adjustable transformer of three-phase linear arranged type Dy (Yz) connection |
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| JP2001267153A (en) * | 2000-03-21 | 2001-09-28 | Tdk Corp | Power transformer |
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