CN107424814B - High-low voltage hybrid excitation two-stage voltage transformer and calibration method thereof - Google Patents

High-low voltage hybrid excitation two-stage voltage transformer and calibration method thereof Download PDF

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CN107424814B
CN107424814B CN201710624564.6A CN201710624564A CN107424814B CN 107424814 B CN107424814 B CN 107424814B CN 201710624564 A CN201710624564 A CN 201710624564A CN 107424814 B CN107424814 B CN 107424814B
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voltage
winding
stage
voltage transformer
auxiliary
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CN107424814A (en
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周峰
殷小东
熊魁
姜春阳
熊博
刘浩
陈松
袁建平
李明
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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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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • 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
    • H01F27/2866—Combination of wires and sheets
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

The invention provides a high-low voltage hybrid excitation two-stage voltage transformer and a calibration method thereof, wherein the two-stage voltage transformer comprises: the main voltage transformer (1) comprises a first-stage iron core (I), a second-stage iron core (II), a primary winding (W1), a secondary winding (W2), a high-voltage excitation winding (W3) and a low-voltage excitation winding (W4), wherein the low-voltage excitation winding (W4) and the high-voltage excitation winding (W3) are wound on the first-stage iron core (I) in sequence, and the secondary winding (W2) and the primary winding (W1) are wound after the first-stage iron core (I) and the second-stage iron core (II) are overlapped; the auxiliary voltage transformer (2) is used for exciting the main voltage transformer and comprises an iron core, an auxiliary primary winding (W5), an auxiliary secondary winding (W6) and a power supply winding (W7), wherein the auxiliary primary winding (W5), the auxiliary secondary winding (W6) and the power supply winding (W7) are wound on the iron core in sequence, the auxiliary primary winding (W5) is connected with the main voltage transformer primary winding (W1) and the high-voltage excitation winding (W3), and the auxiliary secondary winding (W6) is connected with the main voltage transformer low-voltage excitation winding (W4).

Description

High-low voltage hybrid excitation two-stage voltage transformer and calibration method thereof
Technical Field
The invention relates to the technical field of voltage proportion precision measurement, in particular to a high-low voltage hybrid excitation two-stage voltage transformer and a calibration method thereof.
Background
The power frequency voltage proportion standard is key equipment for carrying out power frequency voltage magnitude traceability and transmission work, and is an important measurement standard device for reproducing the power frequency voltage proportion. With the improvement of the accuracy of electric energy measurement, higher requirements are put forward on the accuracy of the mutual inductor, so that a voltage proportion standard device with high accuracy grade and good stability must be researched. At present, the power frequency voltage proportion standard which is generally adopted internationally mainly comprises three types of resistance type, capacitance type and electromagnetic type. The resistance type has limited use above 110kV due to the influence of resistance temperature rise and capacitive leakage current under high voltage. The capacitance type is limited by voltage grade, temperature, proximity effect and structure, the manufacturing difficulty of the capacitance type is obviously increased along with the increase of the voltage grade, and the accuracy and the stability are not as high as the electromagnetic type proportion standard. The existing electromagnetic voltage proportion standard generally comprises a single-stage voltage transformer and a double-stage voltage transformer, wherein the latter has higher accuracy grade theoretically.
At present, a high-voltage excitation structure or a low-voltage excitation structure is generally adopted by a two-stage voltage transformer, an excitation coil is wound on an annular auxiliary iron core firstly, then the excitation coil is sleeved with an annular main iron core, a proportional coil is wound on a sleeved and overlapped circulator body, a secondary coil is wound finally, the excitation coil and the proportional coil are excited by primary voltage, the magnetic potential of the main iron core is compensated by the magnetic potential generated on the auxiliary iron core by the excitation coil, the excitation current of the proportional coil is close to zero, and therefore the two-stage voltage transformer has very small excitation error. However, if a high-voltage excitation mode is adopted, capacitive leakage is large due to the existence of high potential, and if a low-voltage excitation mode is adopted, an auxiliary voltage transformer error is introduced, so that the compensation effect is influenced.
Disclosure of Invention
The invention provides a high-low voltage hybrid excitation two-stage voltage transformer and a calibration method thereof, and aims to solve the technical problems that capacitive errors can be caused only by adopting a high-voltage excitation mode and an auxiliary voltage transformer can span only by adopting a low-voltage excitation mode in the prior art. Wherein the two-stage voltage transformer comprises:
the main voltage transformer 1 comprises a first-stage iron core I, a second-stage iron core II, a primary winding W1, a secondary winding W2, a high-voltage excitation winding W3 and a low-voltage excitation winding W4, wherein the low-voltage excitation winding W4 and the high-voltage excitation winding W3 are sequentially wound on the first-stage iron core I, and the secondary winding W2 and the primary winding W1 are sequentially wound after the first-stage iron core I wound with the low-voltage excitation winding W4 and the high-voltage excitation winding W3 is superposed with the second-stage iron core II;
the auxiliary voltage transformer 2 is a single-pole voltage transformer and is used for exciting a main voltage transformer and comprises an iron core, an auxiliary primary winding W5, an auxiliary secondary winding W6 and a power supply winding W7, wherein the auxiliary primary winding W5, the auxiliary secondary winding W6 and the power supply winding W7 are wound on the iron core in sequence, the auxiliary primary winding W5 is connected with the main voltage transformer primary winding W1 and the high-voltage excitation winding W3, and the auxiliary secondary winding W6 is connected with the main voltage transformer low-voltage excitation winding W4.
Preferably, the first-stage iron core I and the second-stage iron core II of the main voltage transformer are annular iron cores, the diameter of the second-stage iron core II is larger than that of the first-stage iron core I, and the circle centers of the second-stage iron core II and the first-stage iron core I coincide when being overlapped.
Preferably, the secondary core II of the main voltage transformer is four circular rings respectively installed at the inner, outer, upper and lower four sides of the primary core I wound with the low voltage excitation winding W4 and the high voltage excitation winding W3, wherein the upper circular ring and the primary core I wound with the low voltage excitation winding W4 and the high voltage excitation winding W3 are padded with an insulating material to prevent short circuit turns.
Preferably, the number of turns of the high-voltage excitation winding W3 is equal to the number of turns of the primary winding W1 and the auxiliary primary winding W5, and the number of turns of the low-voltage excitation winding W4 is equal to the number of turns of the auxiliary secondary winding W6.
Preferably, copper foils are wrapped between the high-voltage excitation winding W3 and the low-voltage excitation winding W4 and between the secondary winding W2 and the primary winding W1, and the copper foils are grounded through welding leading wires.
According to another aspect of the invention, the invention provides a method of calibrating the two-stage voltage transformer of the invention, the method comprising:
will induce the voltage divider T0As a standard voltage transformer, an inductive voltage divider T is connected0Two-stage voltage transformer T to be testedXAnd a calibrator;
adjusting a reading disc of the calibrator to enable the zero indicator to indicate zero;
switching on power supply, measuring two-stage voltage mutual inductor T to be measuredXWith respect to inductive divider T0Error of (2), then the two-stage voltage transformer T to be measuredXHas an error of ∈X＝ε+εOWherein, epsilon0Is an inductive voltage divider T0The error of (2).
Preferably, when the two-stage voltage transformer to be tested is the two-stage voltage transformer with the low accuracy grade, the inductive voltage divider can replace the two-stage voltage transformer with the high accuracy grade.
Compared with the prior art, the technical scheme provided by the invention has the advantages that the high-low voltage hybrid excitation structure is adopted, so that the capacitive error generated by capacitive leakage current is reduced through electrostatic shielding, the auxiliary iron core structure shields the influence of a stray magnetic field and a leakage magnetic field, the magnetic error is reduced, the error introduced by the auxiliary voltage transformer is eliminated, and the accuracy grade of the two-stage voltage transformer is improved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic diagram of a high-low voltage hybrid excitation two-stage voltage transformer according to an embodiment of the invention;
fig. 2 is a cross-sectional structural view of a main voltage transformer of a high-low voltage hybrid excitation two-stage voltage transformer according to an embodiment of the present invention;
fig. 3 is a cross-sectional structural view of an auxiliary voltage transformer of a high-low voltage hybrid excitation two-stage voltage transformer according to an embodiment of the present invention;
fig. 4 is a cross-sectional structural view of a main voltage transformer of another high-low voltage hybrid excitation two-stage voltage transformer according to another embodiment of the present invention;
fig. 5 is a flowchart of a method for calibrating a high-low voltage hybrid excitation two-stage voltage transformer according to an embodiment of the present invention by using an inductive voltage divider;
fig. 6 is a circuit diagram of the high-low voltage hybrid excitation two-stage voltage transformer calibrated by the inductive voltage divider according to the embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic diagram of a high-low voltage hybrid excitation two-stage voltage transformer according to an embodiment of the present invention. As shown in fig. 1, the two-stage voltage transformer includes a main voltage transformer 1 and an auxiliary voltage transformer 2, wherein:
the main voltage transformer 1 comprises a first-stage iron core I, a second-stage iron core II, a primary winding W1, a secondary winding W2, a high-voltage excitation winding W3 and a low-voltage excitation winding W4.
Fig. 2 is a cross-sectional structural view of a main voltage transformer of a high-low voltage hybrid excitation two-stage voltage transformer according to an embodiment of the present invention. As shown in fig. 2, the low-voltage excitation winding W4 and the high-voltage excitation winding W3 are sequentially wound around the primary core I, and the primary core I wound with the low-voltage excitation winding W4 and the high-voltage excitation winding W3 is stacked with the secondary core II, and then sequentially wound with the secondary winding W2 and the primary winding W1. The second-stage iron core II shown in fig. 2 is a common annular iron core, and as the excitation iron core, the shielding effect is general, but the volume of the two-stage voltage transformer can be reduced.
Preferably, copper foils 3 are wrapped between the high-voltage excitation winding W3 and the low-voltage excitation winding W4 and between the secondary winding W2 and the primary winding W1, and the copper foils 3 are grounded through welding leading wires so as to reduce capacitive leakage between the windings.
The auxiliary voltage transformer 2, which is a unipolar voltage transformer, for exciting the main voltage transformer, includes an iron core, an auxiliary primary winding W5, an auxiliary secondary winding W6, and a power supply winding W7.
Fig. 3 is a cross-sectional structural view of an auxiliary voltage transformer of a high-low voltage hybrid excitation two-stage voltage transformer according to an embodiment of the present invention. As shown in fig. 3, the auxiliary primary winding W5, the auxiliary secondary winding W6, and the power supply winding W7 are wound around the core in this order.
The auxiliary primary winding W5 of the auxiliary voltage transformer 2 is connected to the main voltage transformer primary winding W1 and the high-voltage field winding W3, and the auxiliary secondary winding W6 is connected to the main voltage transformer low-voltage field winding W4.
The invention relates to a main voltage transformer which is simultaneously wound with a high-voltage excitation winding and a low-voltage excitation winding and is connected with an auxiliary voltage transformer, a first transformer which is equivalent to the main voltage transformer is connected with a primary winding and a secondary winding of the auxiliary voltage transformer in parallel, and a first transformer which consists of the high-voltage excitation winding, the low-voltage excitation winding and a first iron core I of the main voltage transformer comprises:
U1＝-E3+I3Z3＝-E ' 4+I3Z3(1)
in the formula of U1Is a primary voltage, E3For inducing potential for high-voltage excitation windings, E4Conversion to the induced potential of the primary side for the low-voltage excitation winding, I3For current in the high-voltage excitation winding, Z3Is the internal impedance of the high-voltage excitation winding.
When the auxiliary voltage transformer is not considered, the first-stage transformer is equivalent to no-load and no-load E'4＝U'4，U'4A voltage converted to the primary side is output for the low voltage field winding.
For auxiliary voltage transformers, there are
U1＝-E5+I5Z5＝-E'6+I5Z5(2)
In the formula, E5To assist in inducing potential in the primary winding, E6For auxiliary conversion of the secondary winding to the induced potential of the primary side, I5To assist the current in the primary winding, Z5To assist the impedance in the primary winding.
When the auxiliary voltage transformer is not considered, the first-stage transformer is equivalent to no-load and no-load E'6＝U'6，U'6The voltage converted to the primary side is output for the auxiliary secondary winding.
Because the turns of the high-voltage excitation winding W3 are equal to those of the auxiliary primary winding W5, and other parameters such as iron core materials are also the same, the internal resistance and the excitation impedance of the primary windings of the first-stage mutual inductor and the auxiliary mutual inductor are the same, and E 'exists'4＝E'6Push out U'4＝U'6. The current in the loop formed by the low-voltage excitation winding W4 and the auxiliary secondary winding W6 is zero, I40, thus, the error of the auxiliary transformer is eliminated, namely:
ε1＝ε3+ε5＝ε3(3)
in the formula, epsilon1Error of first-stage mutual inductor, epsilon3No-load error of the first-stage transformer,. epsilon5To assist in the error of the transformer.
The second-stage voltage transformer consisting of the primary winding W1, the secondary winding W2 and the second-stage iron core II is excited by primary voltage drop of the first-stage iron core, and then the voltage transformer comprises the following components:
ε＝ε1ε2＝ε3ε2(4)
in the formula, epsilon2Error of the second stage voltage transformer. Error (epsilon) of double-stage voltage transformer relative to low-voltage excitation3+ε5)ε2Reduce epsilon5The influence of (c).
Preferably, the first-stage iron core I and the second-stage iron core II of the main voltage transformer 1 are annular iron cores, the diameter of the second-stage iron core II is larger than that of the first-stage iron core I, and the centers of circles of the second-stage iron core II and the first-stage iron core I coincide when the second-stage iron core II and the first-stage iron core I are superposed.
Fig. 4 is a cross-sectional structural view of a main voltage transformer of another high-low voltage hybrid excitation two-stage voltage transformer according to an embodiment of the present invention. As shown in fig. 4, the second-stage iron core II of the main voltage transformer 1 includes an annular groove with a concave cross section and an annular cover plate disposed at an opening of the annular groove, an insulating gasket 4 is disposed between the annular cover plate and the annular groove, the insulating gasket 4 prevents short-circuit turns from being formed, and the second-stage iron core II is an excitation iron core and also performs magnetic shielding, so that a shielding effect can be enhanced, and magnetic errors can be reduced.
Preferably, the number of turns of the high-voltage excitation winding W3 is equal to the number of turns of the primary winding W1 and the auxiliary primary winding W5, and the number of turns of the low-voltage excitation winding W4 is equal to the number of turns of the auxiliary secondary winding W6.
Fig. 5 is a flowchart of a method for calibrating a high-low voltage hybrid excitation two-stage voltage transformer by using an inductive voltage divider according to an embodiment of the present invention. As shown in fig. 5, the method for calibrating the high-low voltage hybrid excitation two-stage voltage transformer according to the present invention by using the inductive voltage divider is performed in step 501.
In step 501, sense divider T is applied0As a standard voltage transformer, an inductive voltage divider T is connected0Two-stage voltage transformer T to be testedXAnd a calibrator.
Fig. 6 is a circuit diagram of the high-low voltage hybrid excitation two-stage voltage transformer calibrated by the inductive voltage divider according to the embodiment of the present invention. As shown in fig. 6, W30 and W10 are connected with the power supply in parallel in polar end joint, W30, W10 and W2 are connected with the power supply in parallel in nonpolar end joint, W20 is connected with a checker K, W2 is connected with a checker D, W1, W3 and W5 are connected with the power supply in parallel in polar end joint, W1, W3 and W5 are connected with the power supply in parallel in nonpolar end joint, W4 is connected with W6 in polar end joint, the nonpolar end joint is connected with the ground, W7 is connected with checkers a and x, and the checker D is grounded.
In step 502, adjusting a reading disc of the calibrator to enable a zero indicator to indicate zero;
in step 503, power is turned on, and the two-stage voltage transformer T to be measured is measuredXWith respect to inductive divider T0Error of (2), then the two-stage voltage transformer T to be measuredXHas an error of ∈X＝ε+εOIn which epsilon0Is the error of the sense voltage divider T0.
Preferably, when the two-stage voltage transformer to be tested is the two-stage voltage transformer with the low accuracy grade, the inductive voltage divider can replace the two-stage voltage transformer with the high accuracy grade.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ means, component, etc. ] are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (6)

1. The utility model provides a high-low pressure hybrid excitation doublestage voltage transformer which characterized in that, doublestage voltage transformer includes:
the main voltage transformer (1) comprises a first-stage iron core (I), a second-stage iron core (II), a primary winding (W1), a secondary winding (W2), a high-voltage excitation winding (W3) and a low-voltage excitation winding (W4), wherein the low-voltage excitation winding (W4) and the high-voltage excitation winding (W3) are wound on the first-stage iron core (I) in sequence, and the secondary winding (W2) and the primary winding (W1) are wound after the first-stage iron core (I) wound with the low-voltage excitation winding (W4) and the high-voltage excitation winding (W3) is superposed with the second-stage iron core (II);
the auxiliary voltage transformer (2) is a single-pole voltage transformer and is used for exciting a main voltage transformer and comprises an iron core, an auxiliary primary winding (W5), an auxiliary secondary winding (W6) and a power supply winding (W7), wherein the auxiliary primary winding (W5), the auxiliary secondary winding (W6) and the power supply winding (W7) are wound on the iron core in sequence, the auxiliary primary winding (W5) is connected with the main voltage transformer primary winding (W1) and the high-voltage excitation winding (W3), and the auxiliary secondary winding (W6) is connected with the main voltage transformer low-voltage excitation winding (W4).
2. The two-stage voltage transformer according to claim 1, wherein the first stage core (I) and the second stage core (II) of the main voltage transformer are ring cores, and the diameter of the second stage core (II) is larger than that of the first stage core (I), and the centers of the circles coincide when the second stage core (II) and the first stage core (I) are overlapped.
3. The two-stage voltage transformer according to claim 1, wherein the second stage core (II) of the main voltage transformer is four rings respectively installed at the inner, outer, upper and lower four sides of the first stage core (I) wound with the low voltage field winding (W4) and the high voltage field winding (W3), wherein the upper rings and the first stage core (I) wound with the low voltage field winding (W4) and the high voltage field winding (W3) are padded with an insulating material to prevent short-circuit turns from being formed.
4. The two-stage voltage transformer according to claim 1, characterized in that the high voltage field winding (W3) has the same number of turns as the primary winding (W1) and the auxiliary primary winding (W5), and the low voltage field winding (W4) has the same number of turns as the auxiliary secondary winding (W6).
5. The two-stage voltage transformer according to claim 1, characterized in that copper foils are coated between the high-voltage field winding (W3) and the low-voltage field winding (W4) and between the secondary winding (W2) and the primary winding (W1), and the copper foils are grounded through welding lead wires.
6. A method of calibrating the two stage voltage transformer of any one of claims 1 to 5, the method comprising:
will sense the voltage divider (T)0) As a standard voltage transformer, an inductive voltage divider (T) is connected0) Two-stage voltage transformer (T) to be testedX) And a calibrator;
adjusting a reading disc of the calibrator to enable the zero indicator to indicate zero;
switching on power supply, measuring two-stage voltage mutual inductor (T)X) Relative to the inductive divider (T)0) Error e of (2), then the two-stage voltage transformer (T) to be testedX) Has an error of ∈X＝ε+εOIn which epsilon0Is an inductive voltage divider (T)0) The error of (2).
CN201710624564.6A 2017-07-27 2017-07-27 High-low voltage hybrid excitation two-stage voltage transformer and calibration method thereof Active CN107424814B (en)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109065343A (en) * 2018-07-10 2018-12-21 中国电力科学研究院有限公司 A kind of high-pressure double-stage voltage transformer
CN110993273B (en) * 2019-11-05 2022-04-15 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
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
CN113219226B (en) * 2021-05-26 2023-02-28 中国电力科学研究院有限公司 Induction voltage divider based on multistage excitation and manufacturing method thereof

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Publication number Priority date Publication date Assignee Title
JPS58212112A (en) * 1982-06-03 1983-12-09 Toshiba Corp Split type auto-transformer
CN85100872A (en) * 1985-04-01 1986-08-27 山西省机械设计研究所 The low-voltage high-precision voltage transformer of stepup transformer compensation
CN104505243A (en) * 2014-09-22 2015-04-08 秦喜昌 Development and application of 0.001-grade high-voltage and high-accuracy double pole voltage transformer
CN106328349A (en) * 2016-09-23 2017-01-11 国网江西省电力公司电力科学研究院 Double-secondary-winding two-stage voltage transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58212112A (en) * 1982-06-03 1983-12-09 Toshiba Corp Split type auto-transformer
CN85100872A (en) * 1985-04-01 1986-08-27 山西省机械设计研究所 The low-voltage high-precision voltage transformer of stepup transformer compensation
CN104505243A (en) * 2014-09-22 2015-04-08 秦喜昌 Development and application of 0.001-grade high-voltage and high-accuracy double pole voltage transformer
CN106328349A (en) * 2016-09-23 2017-01-11 国网江西省电力公司电力科学研究院 Double-secondary-winding two-stage voltage transformer

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