CN112489956A - Three-phase anti-resonance voltage transformer - Google Patents
Three-phase anti-resonance voltage transformer Download PDFInfo
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- CN112489956A CN112489956A CN202011311331.9A CN202011311331A CN112489956A CN 112489956 A CN112489956 A CN 112489956A CN 202011311331 A CN202011311331 A CN 202011311331A CN 112489956 A CN112489956 A CN 112489956A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
- H01F38/26—Constructions
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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
- H01F27/24—Magnetic cores
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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
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
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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
- H01F27/2823—Wires
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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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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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
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/341—Preventing or reducing no-load losses or reactive currents
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Abstract
The invention discloses a three-phase anti-resonance voltage transformer, which comprises a three-column iron core, a three-phase anti-resonance voltage transformer and a three-phase anti-resonance voltage transformer, wherein the three-column iron core is provided with a first column, a second column and a third column; and first, second and third coils wound around the first, second and third poles, respectively; the invention has compact and beautiful structure, small volume, light weight and raw material saving; the three-phase voltage transformer has small exciting current and low no-load loss, reduces the no-load error of a product, further reduces the overall error of the product, improves the precision and avoids the problem of large deviation of three-phase errors; zero-sequence impedance can be greatly improved by methods of enlarging the section of the iron core, increasing the number of turns of the winding and the like, and the anti-ferromagnetic resonance performance is improved; the product precision is greatly improved, and the latest requirement of an electric power department for improving the error margin is met; further reducing the possibility of ferromagnetic resonance and achieving double resonance-proof effect.
Description
Technical Field
The invention relates to a voltage transformer structure, in particular to a three-phase anti-resonance voltage transformer.
Background
At present, most of power distribution networks of 35kV and below in China adopt a neutral point non-effective grounding system, the overvoltage phenomenon of the system is very common, and if no precautionary measure is taken, the power equipment is damaged, so that a large-area power failure accident occurs. According to the operation experience of a power grid, ferromagnetic resonance caused by the iron core saturation of the electromagnetic voltage transformer is more frequently in a neutral ungrounded system.
Under certain excitation conditions, the iron core saturation inductive reactance nonlinearity of the electromagnetic voltage transformer is reduced, and ferromagnetic resonance occurs when the inductive reactance is equal to the capacitive reactance of the line capacitance to ground. The current national power grid mainly has the following three anti-resonance measures for the voltage transformer:
(1) the voltage transformer iron core is coiled by high-quality oriented cold-rolled silicon steel sheets with high electromagnetic induction performance, the magnetic performance is recovered by removing stress through special process annealing, and the potential of a designed inflection point is higher than 1.9 Um;
(2) a three-phase voltage transformer neutral point is grounded through a harmonic elimination device;
(3) the 4PT anti-resonance technology is characterized in that a neutral point of a three-phase transformer is grounded through a zero sequence voltage transformer.
Currently, the 4PT method is the most common and most effective anti-resonance method for electromagnetic voltage transformers. But has the defects of large volume, high cost, inconsistent three-phase excitation characteristics and the like.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the problems occurring in the prior art.
Therefore, the technical problem to be solved by the present invention is that currently, the 4PT method is the most common and most effective anti-resonance method for electromagnetic voltage transformers, but has the disadvantages of large volume, high cost, inconsistent three-phase excitation characteristics, and the like.
In order to solve the technical problems, the invention provides the following technical scheme: a three-phase resonance-proof voltage transformer comprises a three-column iron core, a three-phase resonance-proof voltage transformer and a three-phase resonance-proof voltage transformer, wherein the three-column iron core is provided with a first column, a second column and a third column, and the three-column iron core is distributed in a regular triangle structure; and first, second and third coils wound on the first, second and third poles, respectively.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: the three-column iron core comprises a first iron core, a second iron core and a third iron core, wherein the first iron core, the second iron core and the third iron core are identical in structure and are of square annular structures, the first iron core, the second iron core and the third iron core are in pairwise lap joint to form a city-surrounding regular triangle structure, and two sides of the first iron core, the second iron core and the third iron core are adjacent to each other to form a first column, a second column and a third column.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: the three-column iron core also comprises a fourth iron core, the fourth iron core is also of a square annular structure, and the fourth coil is vertically positioned in the middle of the regular triangle structure surrounded by the first iron core, the second iron core and the third iron core; the fourth iron core is vertically embedded in the inner ring of the first iron core, the second iron core or the third iron core and is perpendicular to the embedded iron cores.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: the fourth coil is wound on one side of the fourth iron core, and the fourth iron core is shorter than the first iron core, the second iron core and the third iron core.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: and the head end of the primary winding of the first coil is led out of the phase line A in the three phase lines of the power supply.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: and a phase line B in the three phase lines of the power supply is led out from the head end of the primary winding of the second coil.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: and a C phase line in the three phase lines of the power supply is led out from the head end of the primary winding of the third coil.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: and the tail end of the primary winding of the fourth coil is led out and connected with an N ground wire.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: the tail ends of the primary windings of the first coil, the second coil and the third coil and the head end of the primary winding of the fourth coil are all connected in a junction mode to be led out from a neutral point O.
As a preferable scheme of the three-phase anti-resonance voltage transformer of the present invention, wherein: and the secondary windings and residual voltage winding wires of the first coil, the second coil, the third coil and the fourth coil correspond to the primary windings.
The invention has the beneficial effects that: the invention has the following beneficial effects:
(1) this three-phase anti-resonance voltage transformer structure, through having adopted special three-phase iron core structure, triangle-shaped three-phase three-column iron core, three-column iron core is formed according to equilateral triangle overlap joint by the oral shape iron core of three opposite cross section and makes the iron core material can save 1/3, three-phase coil winds respectively on three stand of three-column iron core, it is pleasing to the eye to make whole product structure compact, small, light in weight just saves raw and other materials, the oral shape iron core of opposite cross section can be book iron core also can be laminated iron core.
(2) This three-phase anti-resonance voltage transformer structure, special construction has been adopted through three-phase voltage transformer, three-phase voltage transformer iron core formula structure as an organic whole that three-column unshakable in one's determination, the yoke shares each other, and the magnetic circuit equals, it is different to have avoided the three-phase magnetic property, the protective properties condition when causing the inconsistent influence single-phase ground fault of three-phase excitation characteristic, three-phase voltage transformer exciting current is little simultaneously, no-load loss is low, the no-load error that has reduced the product and then reduced the whole error of product, the precision is improved, and because each looks magnetic circuit symmetry of unshakable in one's determination of three-phase voltage transformer equals, avoided because the three-phase magnetic resistance is different, the different and the big problem of three.
(3) This three-phase voltage transformer structure of preventing resonance, the fourth coil 6 through the square iron core is located the hollow position that the triangle delta-shaped of three-column iron core distributes, the spatial position has been utilized ingeniously, space utilization and insulating utilization coefficient have been improved greatly, the product size has further been dwindled, the cost is reduced, epoxy 1/2 can be saved, because the square iron core is independent unshakable in one's determination, and just undertake the zero sequence voltage that equals with the looks voltage and participate in work under the operating mode that takes place single-phase ground fault, the measurement precision when normal work does not produce the influence, can be through enlarging the iron core cross-section, increase zero sequence impedance by a wide margin such as winding number of turns, improve anti ferromagnetic resonance performance.
(4) The three-phase anti-resonance voltage transformer structure is characterized in that the square iron core is embedded in the three-column iron core, the heights of the iron core columns and the coils of the three-column iron core are relatively high, and under the same design parameters, the resistance and the leakage reactance of a winding wire can be reduced due to the reduction of the average turn length of the coils and the reduction of the outer diameter of the coils, so that the load error of a product is reduced, the precision of the product is greatly improved, and the latest requirement of an electric power department for improving the error margin is met.
(5) This voltage transformer structure of preventing resonance of three-phase, through the increase of three-phase voltage transformer coil height, the reduction of external diameter, can make the increase of electric capacity between the winding layer to make whole product capacitance increase, further reduced the possibility of taking place ferromagnetic resonance, played dual anti-resonance effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a structure view of a three-leg core in the first embodiment.
Fig. 2 is a diagram showing a structure of a three-limb core and a coil in the first embodiment.
Fig. 3 is a top view structural view in the first embodiment.
Fig. 4 is a bottom view of the first embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 to 4, a first embodiment of the present invention provides a three-phase anti-resonance voltage transformer, which includes a three-limb iron core 100, wherein the three-limb iron core 100 has a first limb T, a second limb K and a third limb M that are vertically disposed, and an upper view angle of the three-limb iron core 100 is an equilateral triangle structure.
Further comprising a first coil 201, a second coil 202 and a third coil 203, the first coil 201, the second coil 202 and the third coil 203 being wound on the first column T, the second column K and the third column M, respectively.
Further, the three-column iron core 100 includes a first iron core 101, a second iron core 102 and a third iron core 103, specifically, the first iron core 101, the second iron core 102 and the third iron core 103 are all the same in structural size, the first iron core 101, the second iron core 102 and the third iron core 103 are all in a square ring structure, and adjacent sides of the three are mutually overlapped to form an equilateral triangle space, so that 1/3 can be saved in iron core materials, and the first iron core 101, the second iron core 102 and the third iron core 103 can be rolled iron cores or laminated iron cores.
The iron core of the three-column iron core 100 is of an integral structure, iron yokes are shared mutually, magnetic circuits are equal, the problem that three-phase error deviation is large due to the fact that the three-phase excitation characteristics are inconsistent and the protection performance condition is influenced when a single-phase grounding accident is caused is avoided, meanwhile, the three-phase voltage transformer is small in excitation current and low in no-load loss, the no-load error of a product is reduced, the overall error of the product is reduced, the precision is improved, and the problem that the three-phase error deviation is large due to the fact that the three-phase magnetic resistances are different and the excitation currents are different is solved.
Further, two adjacent sides of the first iron core 101, the second iron core 102 and the third iron core 103 form a column, namely a first column T, a second column K and a third column M, specifically, the adjacent sides of the first iron core 101 and the second iron core 102 form the first column T, the adjacent sides of the second iron core 102 and the third iron core 103 form the second column K, the adjacent sides of the first iron core 101 and the third iron core 103 form the third column M, the first coil 201 is wound on the first column T to be connected with the first iron core 101 and the second iron core 102, and the head end of the primary winding of the first coil 201 is led out to be connected with a phase line a in the three phase lines of the power supply; the second coil 202 is wound on the second column K and connected with the second iron core 102 and the third iron core 103, and a B-phase line in a three-phase line of the power supply is led out from the head end of a primary winding of the second coil 202; third coil 203 is wound on third column M to connect first iron core 101 and third iron core 103, and the head end of the primary winding of third coil 203 is led out to be connected with the C-phase line in the three-phase line of the power supply.
Further, the three-limb iron core 100 further comprises a fourth coil 204, the fourth coil 204 is arranged in the middle of the regular triangle surrounded by the first iron core 101, the second iron core 102 and the third iron core 103, the fourth iron core 104 is also in a square annular structure, the fourth iron core 104 is vertically embedded in an inner ring of the first iron core 101, the second iron core 102 or the third iron core 103 and is vertical to the embedded iron core, and the fourth coil 204 is wound on the side edge of the fourth iron core 104; the space position is skillfully utilized, the space utilization rate and the insulation utilization coefficient are greatly improved, the size of the product is further reduced, the cost is reduced, and the epoxy resin 1/2 can be saved.
Because the fourth iron core 104 is an independent iron core and only bears the zero-sequence voltage equal to the phase voltage to participate in the work under the working condition of single-phase grounding accident, the metering precision in normal work is not affected, the zero-sequence impedance can be greatly improved by methods of enlarging the section of the iron core, increasing the number of turns of a winding and the like, and the anti-ferromagnetic resonance performance is improved.
Furthermore, the tail end of the primary winding of the fourth coil 204 is led out to be connected with an N ground wire, and the tail ends of the primary windings of the first coil 201, the second coil 202, the third coil 203 and the head end of the primary winding of the fourth coil 204 are all connected in a tandem manner to be led out from a neutral point O; the capacitance between winding layers can be increased by increasing the height and reducing the outer diameter of the three-phase voltage transformer coil, so that the capacitance of the whole product is increased, and the possibility of ferromagnetic resonance is further reduced; the secondary winding wiring of the first coil 201, the second coil 202, the third coil 203 and the fourth coil 204 corresponds to the primary winding, and is the same as the original 4PT structure, and the structural product can be simultaneously suitable for epoxy resin insulation, oil immersion insulation, SF6 gas insulation and the like.
In the actual operation process, when the structure is used, the three-phase voltage transformer is composed of a three-phase voltage transformer adopting a triangular three-column iron core, a three-phase Y-shaped connection method with three coils distributed in a triangular shape in a hollow mode and a single-phase voltage transformer adopting a fourth iron core 104 with the coils positioned in the hollow position of the three-phase voltage transformer, the neutral point of the three-phase voltage transformer adopting the Y-shaped connection method is connected with the head end of the single-phase voltage transformer and is designed to be high in potential, and the tail end of the single-phase voltage transformer is grounded. When the three phases of the system voltage are balanced, the neutral point of the three-phase voltage transformer is 0 potential, and the single-phase voltage transformer does not bear voltage. When a system has a single-phase earth fault, the neutral point of the three-phase voltage transformer shifts to a phase voltage, at the moment, the primary winding of each phase of the three-phase voltage transformer bears the phase voltage unchanged, the single-phase voltage transformer bears a zero-sequence voltage equal to the phase voltage, and when the rated magnetic density of the single-phase voltage transformer is not higher than that of the three-phase voltage transformer, the magnetic density of an iron core of the whole voltage transformer cannot be increased, the whole three-phase excitation inductance cannot be reduced in a linear region, ferromagnetic resonance between the single-phase voltage transformer and a line capacitance reactance to ground cannot occur, and the resonance prevention effect is achieved.
In conclusion, the three-phase voltage transformer adopts a special structure, the iron core of the three-column iron core 100 is of an integrated structure, the iron yokes share with each other, and the magnetic circuits are equal, so that the condition that the protection performance during single-phase grounding accidents is influenced by the inconsistency of three-phase excitation characteristics due to different magnetic properties of three phases is avoided, meanwhile, the three-phase voltage transformer is small in excitation current and low in no-load loss, the no-load error of a product is reduced, the overall error of the product is further reduced, the precision is improved, and the problem of large three-phase error deviation caused by different three-phase magnetic resistances, namely different excitation currents is avoided due to the fact that the magnetic circuits of the iron cores of the three.
The transformer is characterized in that the fourth iron core 104 is embedded in the three-column iron core 100, the heights of the first column T, the second column K, the third column M and the coil of the three-column iron core 100 are relatively high, and under the same design parameters, the wire resistance and the leakage reactance among windings can be reduced due to the reduction of the average turn length and the outer diameter of the coil, so that the load error of a product is reduced, the precision of the product is greatly improved, and the requirements of a new standard on improving the error margin are met.
Through the increase of the height of the three-phase voltage transformer coil and the reduction of the outer diameter, the capacitance between winding layers can be increased, so that the capacitance of the whole product is increased, and the possibility of ferromagnetic resonance is further reduced.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a three-phase anti-resonance voltage transformer which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a three-column iron core (100) having a first column (T), a second column (K) and a third column (M), the three-column iron core (100) being distributed in a regular triangle structure; and the number of the first and second groups,
a first coil (201), a second coil (202), and a third coil (203), the first coil (201), the second coil (202), and the third coil (203) being wound on the first column (T), the second column (K), and the third column (M), respectively.
2. The three-phase anti-resonance voltage transformer according to claim 1, characterized in that: the three-column iron core (100) comprises a first iron core (101), a second iron core (102) and a third iron core (103), the first iron core (101), the second iron core (102) and the third iron core (103) are identical in structure and are of square annular structures, the first iron core (101), the second iron core (102) and the third iron core (103) are in pairwise lap joint to form a city-surrounding regular triangle structure, and the side edges of the first iron core (101), the second iron core (102) and the third iron core (103) are in pairwise adjacent connection to form a first column (T), a second column (K) and a third column (M).
3. The three-phase anti-resonance voltage transformer according to claim 1, characterized in that: the three-column iron core (100) further comprises a fourth iron core (104), the fourth iron core (104) is also in a square annular structure, and the fourth coil (204) is vertically positioned in the middle of a regular triangle structure surrounded by the first iron core (101), the second iron core (102) and the third iron core (103);
the fourth iron core (104) is vertically embedded in an inner ring of the first iron core (101), the second iron core (102) or the third iron core (103) and is perpendicular to the embedded iron cores.
4. The three-phase anti-resonance voltage transformer according to claim 3, characterized in that: the fourth coil (204) is wound around one side of the fourth core (104), and the fourth core (104) is shorter in height than the first core (101), the second core (102), and the third core (103).
5. The three-phase anti-resonance voltage transformer according to claim 1, characterized in that: a phase line A in the three phase lines of the power supply is led out from the head end of the primary winding of the first coil (201).
6. The three-phase anti-resonance voltage transformer according to claim 5, characterized in that: and a B phase line in the three phase lines of the power supply is led out from the head end of the primary winding of the second coil (202).
7. The three-phase anti-resonance voltage transformer according to claim 6, characterized in that: and a C-phase line in a power supply three-phase line is led out from the head end of the primary winding of the third coil (203).
8. The three-phase anti-resonance voltage transformer according to claim 7, characterized in that: and the tail end of the primary winding of the fourth coil (203) is led out and connected with an N ground wire.
9. The three-phase anti-resonance voltage transformer according to claim 3, characterized in that: the tail ends of the primary windings of the first coil (201), the second coil (202), the third coil (203) and the head end of the primary winding of the fourth coil (204) are all connected in a junction mode to a neutral point O and led out.
10. The three-phase anti-resonance voltage transformer of claim 9, characterized in that: and secondary windings and residual voltage winding wires of the first coil (201), the second coil (202), the third coil (203) and the fourth coil (204) correspond to the primary windings.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113593842A (en) * | 2021-06-10 | 2021-11-02 | 西安交通大学 | Vertical iron core structure of rolling up of transformer that contains zero sequence magnetic flux return circuit |
| CN114141511A (en) * | 2021-11-30 | 2022-03-04 | 江苏科兴电器有限公司 | Gas-insulated three-phase 4PT combined voltage transformer |
| CN117594333A (en) * | 2023-12-12 | 2024-02-23 | 山东艾诺智能仪器有限公司 | High-power magnetic integrated LLC high-frequency inductance transformer and three-phase bidirectional LLC circuit |
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| CN114141511A (en) * | 2021-11-30 | 2022-03-04 | 江苏科兴电器有限公司 | Gas-insulated three-phase 4PT combined voltage transformer |
| CN117594333A (en) * | 2023-12-12 | 2024-02-23 | 山东艾诺智能仪器有限公司 | High-power magnetic integrated LLC high-frequency inductance transformer and three-phase bidirectional LLC circuit |
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