CN109065343A - A kind of high-pressure double-stage voltage transformer - Google Patents

A kind of high-pressure double-stage voltage transformer Download PDF

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Publication number
CN109065343A
CN109065343A CN201810752422.2A CN201810752422A CN109065343A CN 109065343 A CN109065343 A CN 109065343A CN 201810752422 A CN201810752422 A CN 201810752422A CN 109065343 A CN109065343 A CN 109065343A
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Prior art keywords
winding
iron core
voltage transformer
level
order
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Inventor
刘浩
周峰
殷小东
姜春阳
袁建平
李明
陈松
刘俭
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Priority to CN201810752422.2A priority Critical patent/CN109065343A/en
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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
    • 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
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers

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

Abstract

The invention discloses a kind of high-pressure double-stage voltage transformers, it include: first order iron core C1, second level iron core C2, ratio winding N1, ratio winding N2, excitation winding N3, excitation winding N4, first order iron core C1 and second level iron core C2 are respectively enclosed to rectangular box, the rectangular box that second level iron core C2 is surrounded is less than the rectangular box that first order iron core C1 is surrounded, second level iron core C2 is located in the inner space for the framework that first order iron core C1 is surrounded, the rectangular box that second level iron core C2 is surrounded is parallel with each side of rectangular box that first order iron core surrounds, first order iron core C1 and magnetic line of force direction are consistent with the magnetic line of force direction of second level iron core C2, N3 and N4 is wound on first order iron core C1, form first order voltage transformer, N1 and N2 is wound on first order iron core C1 and the second level On iron core C2, second level voltage transformer is formed.It solves the Insulation Problems between high-voltage winding, while solving that accuracy is low, the problem of carrying load ability difference.

Description

A kind of high-pressure double-stage voltage transformer
Technical field
This application involves High-Voltage Test Technology fields, and in particular to a kind of high-pressure double-stage voltage transformer.
Background technique
Double-stage voltage transformer has many advantages, such as that accuracy is high, stability is good, carrying load ability is strong, is used as power-frequency voltage Ratio standard utensil.Typical case is inductive voltage divider, and such as 1kV inductive voltage divider, uncertainty reaches 10-7.Dual stage voltage For mutual inductor there are two first winding, the winding of the first order will pass through the winding of the second level, and the insulation between winding is difficult to design, therefore The voltage rating of double-stage voltage transformer is usually no more than 35kV.It, can be enterprising in structure to solve Insulation Problems under condition of high voltage Row improves, and using low pressure excitation mode, is made of two mutual inductors with voltage class.Double-stage voltage transformer is up at present 110/ √ 3kV, using low pressure excitation mode, class of accuracy is up to 0.001 grade.But this kind of mode needs to increase a phase With the auxiliary mutual inductor of voltage class, production and use in this way is all comparatively laborious.Higher voltage grade, as 220,500kV is current It is all made of single step arrangement, accuracy is 0.005 grade, and carrying load ability is poor.So high-pressure double-stage voltage transformer at present Insulation Problems between high-voltage winding are difficult to solve, but also there are accuracy low, the problem of carrying load ability difference.
Summary of the invention
The application provides a kind of high-pressure double-stage voltage transformer and solves simultaneously for solving the Insulation Problems between high-voltage winding Accuracy of having determined is low, the problem of carrying load ability difference.
The application provides a kind of high-pressure double-stage voltage transformer, comprising:
First order iron core C1, second level iron core C2, ratio winding N1, ratio winding N2, excitation winding N3, excitation winding N4；
First order iron core C1 and second level iron core C2 is respectively enclosed to rectangular box, the rectangular box that second level iron core C2 is surrounded Less than the rectangular box that first order iron core C1 is surrounded, the inside that second level iron core C2 is located at the framework that first order iron core C1 is surrounded is empty Between in, the rectangular box that second level iron core C2 is surrounded is parallel with each side of rectangular box that first order iron core surrounds, first order iron Heart C1 and magnetic line of force direction are consistent with the magnetic line of force direction of second level iron core C2；
N3 and N4 is wound on first order iron core C1, forms first order voltage transformer；
N1 and N2 is wound on first order iron core C1 and second level iron core C2, forms second level voltage transformer.
Preferably, further includes: iron core bracket is used to support the voltage transformer.
Preferably, further includes:
The ratio winding N1 and excitation winding N3 is placed in iron core two sides in symmetrical structure；
The ratio winding N1 is equal with the number of turns of the excitation winding N3, direction of winding is identical.
Preferably, the ratio winding N1 is identical as the direction of winding of the excitation winding N3, is used for the ratio winding The adjacent high-pressure side of the N1 and excitation winding N3 is in equipotential.
Preferably, further includes:
The winding mode of the ratio winding N1 and the excitation winding N3, using hierarchical layer insulation winding method.
Preferably, further includes:
The coiling of the ratio winding N1 and excitation winding N3 is in segmentation pyramidal structure.
Preferably, the winding is at segmentation pyramidal structure, comprising: what the winding segments end face distance of high voltage laterally shielded Distance is greater than the distance that the winding segments end face distance of low-voltage laterally shields.
It is preferably, described to use hierarchical layer winding method, further includes:
The insulation thickness using hierarchical layer insulation winding method of the ratio winding N1 and excitation winding N3, is general 3 times of logical winding method.
Preferably, further includes:
The coiling of the ratio winding N1, ratio winding N2, excitation winding N3, excitation winding N4 are uniform coiling.
Preferably, the uniform coiling, for guaranteeing that Leakage Current causes capacitive error to cancel out each other.
Preferably, the material that the first order iron core C1 is selected, specifically can be silicon steel；What second level iron core C2 was selected Material specifically can be permalloy.
Compared with prior art, the application has the following advantages:
Ratio winding N1 and excitation winding N3 is in symmetrical structure by a kind of high-pressure double-stage voltage transformer provided by the present application Iron core two sides are handled, and number of turns is equal, direction of winding is identical, and coiling is insulated in segmentation pyramidal structure using hierarchical layer Winding method, the coiling of all windings all use uniform coiling, for guaranteeing that Leakage Current causes capacitive error to cancel out each other.From And solve the Insulation Problems between high-voltage winding, while solving that accuracy is low, the problem of carrying load ability difference.
Detailed description of the invention
Fig. 1 is high-pressure double-stage voltage transformer iron core and winding construction schematic diagram provided by the embodiments of the present application；
Fig. 2 be the invention relates to first order iron core and second level iron core relative position and schematic shapes；
Fig. 3 be the invention relates to tower winding construction schematic diagram；
Fig. 4 be the invention relates to hierarchical layer insulate winding method；
Fig. 5 be the invention relates to equivalent circuit and polar plot；
Fig. 6 be the invention relates to high-pressure double-stage voltage transformer scheme circuit；
Fig. 7 be the invention relates to winding the schematic diagram of the section structure.
Specific embodiment
Many details are explained in the following description in order to fully understand the application.But the application can be with Much it is different from other way described herein to implement, those skilled in the art can be without prejudice to the application intension the case where Under do similar popularization, therefore the application is not limited by following public specific implementation.
Fig. 1 is please referred to, Fig. 1 is high-pressure double-stage voltage transformer iron core and winding construction signal provided by the embodiments of the present application Figure, is described in detail below with reference to Fig. 1.
A kind of high-pressure double-stage voltage transformer provided by the present application, comprising: first order iron core C1, second level iron core C2, ratio Example winding N1, ratio winding N2, excitation winding N3, excitation winding N4；First order iron core C1 and second level iron core C2 are respectively enclosed to Rectangular box, the rectangular box that second level iron core C2 is surrounded are less than the rectangular box that first order iron core C1 is surrounded, second level iron core C2 is located in the inner space for the framework that first order iron core C1 is surrounded, the rectangular box that second level iron core C2 is surrounded and first order iron Each side for the rectangular box that the heart surrounds is parallel, the magnetic line of force direction of first order iron core C1 and magnetic line of force direction and second level iron core C2 Unanimously；N3 and N4 is wound on first order iron core C1, forms first order voltage transformer；N1 and N2 is wound on first order iron core C1 and On second level iron core C2, second level voltage transformer is formed.
Traditional double-stage voltage transformer is using round iron core, around component layers uniformly around system.For high-voltage excitation type twin-stage electricity Mutual inductor is pressed, the low-pressure side of ratio winding is close to excitation winding high-pressure side, therefore the insulation of 35kV above is difficult reality It is existing, it is necessary to be improved from structure.The structure that the application proposes high-pressure double-stage voltage transformer iron core and winding as shown in Fig. 1 Structural schematic diagram, 1 is a ratio winding in Fig. 1, and 2 be grading ring, and 3 be an excitation winding, and 4 be permalloy iron core, and 5 are Iron core bracket, 6 be silicon steel plate core.Iron core bracket is used to support the voltage transformer.First order iron core C1 and second level iron The relative position of heart C2 and shape are as shown in Fig. 2, from figure 2 it can be seen that the shape class cylindrical body of first order iron core C1, and second Grade iron core C2 is cuboid, and winding is wound on first order iron core C1 and second level iron core C2, the rectangle that second level iron core C2 is surrounded Framework is parallel with each side for the rectangular box that first order iron core surrounds, first order iron core C1 and magnetic line of force direction and second level iron core The magnetic line of force direction of C2 is consistent.
High-pressure double-stage voltage transformer provided by the present application thes improvement is that compared with conventional voltage transformer:
(1) two first winding is placed in iron core two sides in symmetrical structure, it is contemplated that magnetic direction, the number of turns phase of winding It is answered Deng, direction of winding identical.In this way, adjacent high-pressure side is in equipotential, solves traditional double-stage voltage transformer ratio winding Insulation problem between excitation winding.
The ratio winding N1 of first order voltage transformer and excitation winding N3 are referred to as once in the embodiment of the present application The ratio winding N2 of second level voltage transformer and excitation winding N4 are referred to as secondary winding by winding.
(2) first order iron core C1 uses the silicon steel iron core of R profile matter, the coiling of first winding in segmentation pyramidal structure around System, the secondary winding of voltage transformer are wound on the inside of first winding.Secondary winding number of turns is seldom, directly on insulating cylinder around System.First winding conducting wire is in segmentation tower structure, as shown in Figure 3.As seen from the figure, the higher winding segments end face of voltage is far from side The distance shielded to face is remoter, increases effective insulation distance in this way, is also beneficial to the homogenization distribution of electric field.
In order to make full use of the insulation performance of layer insulation medium, using hierarchical layer insulation method coiling layer insulation, such as Fig. 4 It is shown.What is indicated in figure is that a layer dielectric has 3qLayer, point 3 grades of coilings, insulation thickness is 3 times of common Z-type winding process.
Voltage transformer will form the load error of voltage transformer, when being powered operation in order to absolutely prove the application The high-pressure double-stage voltage transformer of embodiment, is described in detail below the calculation method of error.If forming first order voltage transformer Error be ε1.The error of second level voltage transformer is ε2.If the total no-load error of double-stage voltage transformer is εK.Equivalent electricity Road and polar plot are as shown in Figure 5.
It is defined according to transformer error, then
First order error:
Second level error:
Total no-load error:
More specifically, error is by than poor fKWith angular difference δKComposition, obtains:
In above formula, B1、B2: first and second grade of mutual inductor flux density；ψ1e、ψ1: first and second grade of mutual inductor core loss angle；φ1e、 φ1: first and second grade of mutual inductor primary impedance angle.
What is calculated above is no-load error, and actually overall error further includes capacitive error and magnetic error:
Capacitive error:
Magnetic error:
Overall error: ε=εK+εC+εL
In above formula, BC: capacitive reveals equivalent receiving；ZD1: capacitive reveals equivalent impedance；ZD2: magnetic error equivalent impedance.
In Fig. 5,6, I01: the exciting current of first order mutual inductor；I02: the exciting current of second level mutual inductor；Zm1: the The excitation impedance of level-one mutual inductor；Zm2: the excitation impedance of second level mutual inductor；Z1e: first order mutual inductor first winding N1eIt is interior Impedance；Z1: second level mutual inductor first winding N1Internal impedance；U1: double-stage voltage transformer primary voltage；U′2: dual stage voltage Mutual inductor converts the secondary voltage to primary side；Z′2: double-stage voltage transformer converts the secondary impedance to primary side.
Case study on implementation designs high-pressure double-stage voltage transformer by taking 110/ √ 3kV voltage class as an example, based on principle.
First order iron core chooses silicon steel plate core (30ZH105).Firstly, iron core work flux density B generally takes under voltage rating 1.0T.The selection of circle potential needs to consider many factors such as core section, error performance and secondary winding the number of turns.In work magnetic It is close it is certain under the premise of, circle potential is bigger, needs the sectional area of iron core bigger, and excitation admittance increase causes error to increase；On the contrary, If circle potential is too small, more the number of turns are needed, first winding internal impedance becomes larger, and error also increases.According to " high-voltage mutual inductor " Handbook, for 110kV and above, circle potential value range are as follows: (1.8~3) V, this chooses first winding N1= 33000, then circle potential: et=UN/N1=1.92 (V).According to formula: et=4.44fBSk × 10-4, in above formula: k is folded for iron core Piece coefficient, takes 0.99.Calculate sectional area S1=87.36.According to 30ZH105 type silicon steel sheet BH curve, magnetic field strength and iron are obtained Heart loss angle: H2=0.25 (A/cm), ψ=60 °.By magnetic circuit theorem: I01N1=Hlp, obtain exciting current: I01=7.58 × 10-4。
It can be seen from Fig. 5 that the voltage at second level mutual inductor both ends is equal to a pressure drop of first order mutual inductor.First order mutual inductance The impedance Z of device1e=R+jX, wherein R is an internal impedance, and X is anti-for leakage inductance.It calculates separately below.
According to the anti-calculation formula of leakage inductance (primary side is arrived in conversion)
In formula:
Each parameter is as shown in Figure 7 in above formula.
Winding dimensional parameters are substituted into, X is computed12=80K.Therefore, pressure drop of first order mutual inductor:
Other parameters design is referring to first order mutual inductor calculation method.First and second grade of iron core parameter is as shown in table I:
I iron core parameter table of table
Since high-voltage winding the number of turns is more, voltage is high, therefore distribution capacity is big, and Leakage Current is also big.And with voltage Increase, the Leakage Current of generation also obviously increases.Leakage Current brings additive error to mutual inductor, is by high-voltage winding The key factor that accuracy of instrument transformers is promoted.As long as the internal impedance of every circle winding is equal or Leakage Current is equal, then capacitive Error caused by leakage is zero.At this moment the distribution capacity in high-voltage winding is equivalent in parallel with high-voltage winding, as shown in Figure 5, ZD1=0, the error of twin-stage mutual inductor is not influenced, in actual design, guarantees the uniform coiling of high-voltage winding.The height of this secondary design Pressure winding is tower, and outer layer ratio of winding internal layer Zhou Chang great, internal impedance are big, while the number of plies is few to derided capacitors and Leakage Current It is small.Therefore, capacitive error caused by capacitive leakage is cancelled out each other, equivalent impedance ZD1≈0。
Linearity error caused by magnetism error caused by capacitive error, leakage field as caused by capacitive leakage and other factors, It can be compensated by the way that mutual inductor is secondary.It is exactly to form various routes using iron core, winding and RLC element compensation electricity is added Pressure.It can be further improved its class of accuracy using compensation circuit.
Semi-insulating serial addition is finally used, its error is calibrated, low side is directly demarcated using 10kV.
3 low side error of table:
Table 4 is high linear
According to JJG-314 measurement voltage ct calibrating regulation, the 110/ √ 3kV high-pressure double-stage voltage of this secondary design is mutual The class of accuracy of sensor is up to 0.001 grade.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair The present invention is described in detail, those of ordinary skill in the art still can to a specific embodiment of the invention into Row modifies perhaps equivalent replacement and these exist without departing from any modification of spirit and scope of the invention or equivalent replacement Apply within pending claims of the invention.

Claims (11)

1. a kind of high-pressure double-stage voltage transformer characterized by comprising
First order iron core C1, second level iron core C2, ratio winding N1, ratio winding N2, excitation winding N3, excitation winding N4；
First order iron core C1 and second level iron core C2 is respectively enclosed to rectangular box, and the rectangular box that second level iron core C2 is surrounded is less than The rectangular box that first order iron core C1 is surrounded, second level iron core C2 are located at the inner space for the framework that first order iron core C1 is surrounded In, the rectangular box that second level iron core C2 is surrounded is parallel with each side of rectangular box that first order iron core surrounds, first order iron core C1 and magnetic line of force direction are consistent with the magnetic line of force direction of second level iron core C2；
N3 and N4 is wound on first order iron core C1, forms first order voltage transformer；
N1 and N2 is wound on first order iron core C1 and second level iron core C2, forms second level voltage transformer.
2. voltage transformer according to claim 1, which is characterized in that further include: iron core bracket is used to support the electricity Press mutual inductor.
3. voltage transformer according to claim 1, which is characterized in that further include:
The ratio winding N1 and excitation winding N3 is placed in iron core two sides in symmetrical structure；
The ratio winding N1 is equal with the number of turns of the excitation winding N3, direction of winding is identical.
4. voltage transformer according to claim 3, which is characterized in that the ratio winding N1 and excitation winding N3 Direction of winding it is identical, the adjacent high-pressure side for the ratio winding N1 and the excitation winding N3 is in equipotential.
5. according to claim 1 or 4 voltage transformer, which is characterized in that further include:
The winding mode of the ratio winding N1 and the excitation winding N3, using hierarchical layer insulation winding method.
6. voltage transformer according to claim 1, which is characterized in that further include:
The coiling of the ratio winding N1 and excitation winding N3 is in segmentation pyramidal structure.
7. voltage transformer according to claim 6, which is characterized in that the winding is at segmentation pyramidal structure, comprising: high The winding segments end face distance that the winding segments end face distance that laterally shields of distance of voltage is greater than low-voltage laterally shield away from From.
8. voltage transformer according to claim 5, which is characterized in that described to use hierarchical layer winding method, further includes:
The insulation thickness using hierarchical layer insulation winding method of the ratio winding N1 and the excitation winding N3, be commonly around 3 times of method processed.
9. voltage transformer according to claim 1, which is characterized in that further include:
The coiling of the ratio winding N1, ratio winding N2, excitation winding N3, excitation winding N4 are uniform coiling.
10. voltage transformer according to claim 8, which is characterized in that the uniform coiling, for guaranteeing Leakage Current Capacitive error is caused to cancel out each other.
11. voltage transformer according to claim 1, which is characterized in that the material that the first order iron core C1 is selected, tool Body can be silicon steel；The material that second level iron core C2 is selected, specifically can be permalloy.
CN201810752422.2A 2018-07-10 2018-07-10 A kind of high-pressure double-stage voltage transformer Pending CN109065343A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110993273A (en) * 2019-11-05 2020-04-10 中国电力科学研究院有限公司 Two-stage excitation high-voltage proportion standard device and error compensation method
CN111983541A (en) * 2020-07-22 2020-11-24 中国电力科学研究院有限公司 Method and device for calculating load error of multi-winding electromagnetic voltage transformer
CN112103060A (en) * 2020-08-07 2020-12-18 中国电力科学研究院有限公司 Multi-stage excitation high-voltage proportion standard device

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CN106443154A (en) * 2016-09-23 2017-02-22 国网江西省电力公司电力科学研究院 Current and voltage ratio transformation and sampling device
CN107424814A (en) * 2017-07-27 2017-12-01 中国电力科学研究院 A kind of high-low pressure composite excitation double-stage voltage transformer and its calibration method

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CN201638666U (en) * 2009-12-28 2010-11-17 上海卓高电气有限公司 110kV single-phase electromagnetic type voltage transformer without partial discharge
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110993273A (en) * 2019-11-05 2020-04-10 中国电力科学研究院有限公司 Two-stage excitation high-voltage proportion standard device and error compensation method
CN111983541A (en) * 2020-07-22 2020-11-24 中国电力科学研究院有限公司 Method and device for calculating load error of multi-winding electromagnetic voltage transformer
CN111983541B (en) * 2020-07-22 2023-12-26 中国电力科学研究院有限公司 Method and device for calculating load error of multi-winding electromagnetic voltage transformer
CN112103060A (en) * 2020-08-07 2020-12-18 中国电力科学研究院有限公司 Multi-stage excitation high-voltage proportion standard device
CN112103060B (en) * 2020-08-07 2022-07-01 中国电力科学研究院有限公司 Multi-stage excitation high-voltage proportion standard device

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