CN107424814A - A kind of high-low pressure composite excitation double-stage voltage transformer and its calibration method - Google Patents
A kind of high-low pressure composite excitation double-stage voltage transformer and its calibration method Download PDFInfo
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- CN107424814A CN107424814A CN201710624564.6A CN201710624564A CN107424814A CN 107424814 A CN107424814 A CN 107424814A CN 201710624564 A CN201710624564 A CN 201710624564A CN 107424814 A CN107424814 A CN 107424814A
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- iron core
- voltage transformer
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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
Abstract
The present invention, which provides a kind of high-low pressure composite excitation double-stage voltage transformer and its calibration method, the double-stage voltage transformer, to be included：Principal voltage transformer 1, it includes first order iron core I, second level iron core II, first winding W1, secondary winding W2, high-voltage excitation winding W3 and low pressure Exciting Windings for Transverse Differential Protection W4, wherein, low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 are wound on first order iron core I successively, coiling secondary winding W2 and first winding W1 successively after first order iron core I and second level iron core II are stacked；Auxiliary potential transformer 2, it is used to carry out excitation to principal voltage transformer, it includes iron core, auxiliary first winding W5, auxiliary secondary winding W6 and power supply winding W7, wherein, auxiliary first winding W5, auxiliary secondary winding W6 and power supply winding W7 are wound on iron core successively, and auxiliary first winding W5 is connected with principal voltage transformer first winding W1 and high-voltage excitation winding W3, auxiliary secondary winding W6 is connected with principal voltage transformer low pressure Exciting Windings for Transverse Differential Protection W4.
Description
Technical field
Encouraged the present invention relates to voltage ratio Technology of Precision Measurement field, and more particularly, to a kind of mixing of high-low pressure
Magnetic double-stage voltage transformer and its calibration method.
Background technology
Power-frequency voltage ratio standard is the key equipment carried out power-frequency voltage magnitude tracing and transmit work, is for reappearing
The important metrological standard unit of power-frequency voltage ratio.With the raising of the electric energy metrical degree of accuracy, the degree of accuracy to transformer proposes
Higher requirement, it is therefore necessary to study the voltage ratio standard set-up that class of accuracy is high, stability is good.At present, in the world
The power-frequency voltage ratio standard generally used mainly has resistance-type, condenser type and electromagnetic type three types.Resistance-type is under high pressure
Due to resistance temperature rise and the influence of capacitive leakage current, it is set to be restricted 110kV is used above.Condenser type is due to by electricity
The limitation of grade, temperature, kindred effect and structure is pressed, with the rise of voltage class, its manufacture difficulty significantly increases, and accurately
Degree and stability are not as electromagnetic type ratio standard height.Existing electromagnetic potential ratio standard typically has single electrode voltage transformer and double
Two kinds of step voltage transformer, class of accuracy is higher in theory by the latter.
At present, double-stage voltage transformer first aids in generally using high-voltage excitation or low pressure excitation structure in annular
Coiling magnet exciting coil on iron core, then with annular main iron core trap, coiling ratio coil with circulator after intussusception, finally
Coiling secondary coil, magnet exciting coil and ratio coil all use primary voltage excitation, are produced by magnet exciting coil on auxiliary iron core
Magnetic potential compensate the magnetic potential of main iron core, be close to zero the exciting current of ratio coil, then double-stage voltage transformer has non-
Normal small excitation error.But if using high-voltage excitation mode, make it that capacitive leakage is larger because high potential is present, if using
Low pressure excitation mode, then auxiliary potential transformer error is introduced, have impact on the effect of compensation.
The content of the invention
In order to solve only to take high-voltage excitation mode to have capacitive error existing for background technology, only with low pressure excitation side
Formula has auxiliary potential transformer one and provides a kind of high-low pressure composite excitation dual stage voltage mutual inductance across this technical problem, the present invention
Device and its calibration method.Wherein, the double-stage voltage transformer includes：
Principal voltage transformer 1, it includes first order iron core I, second level iron core II, first winding W1, secondary winding W2, height
Exciting Windings for Transverse Differential Protection W3 and low pressure Exciting Windings for Transverse Differential Protection W4 is pressed, wherein, low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 are wound on the successively
On one-level iron core I, the first order iron core I and second level iron core II that are wound with low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 are folded
Postpone coiling secondary winding W2 successively and first winding W1；
Auxiliary potential transformer 2, it is unipolar voltage transformer, and for carrying out excitation to principal voltage transformer, it includes
Iron core, auxiliary first winding W5, auxiliary secondary winding W6 and power supply winding W7, wherein, auxiliary first winding W5, auxiliary it is secondary around
Group W6 and power supply winding W7 are wound on iron core successively, and aid in first winding W5 and principal voltage transformer first winding W1 and height
Exciting Windings for Transverse Differential Protection W3 connections are pressed, auxiliary secondary winding W6 is connected with principal voltage transformer low pressure Exciting Windings for Transverse Differential Protection W4.
Preferably, the first order iron core I of the principal voltage transformer and second level iron core II is ring-type iron core, and the second level
Iron core II diameter is more than center of circle when first order iron core I, second level iron core II and first order iron core I are stacked and overlapped.
Preferably, the second level iron core II of the principal voltage transformer is four annulus, is separately mounted to be wound with low pressure
Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 first order iron core I it is inside and outside up and down four sides, wherein upside annulus and be wound with
Low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 first order iron core I, which is lined with insulating materials, to be prevented from forming short-circuit circle.
Preferably, the number of turn of the high-voltage excitation winding W3 and first winding W1 and auxiliary first winding W5 number of turn phase
Deng low pressure Exciting Windings for Transverse Differential Protection W4 and auxiliary secondary winding W6 equal turn numbers.
Preferably, between the high-voltage excitation winding W3 and low pressure Exciting Windings for Transverse Differential Protection W4 and secondary winding W2 and first winding W1
Between be coated with copper foil, copper foil is grounded by welding lead-out wire.
According to another aspect of the present invention, the present invention provides a kind of side for calibrating double-stage voltage transformer of the present invention
Method, methods described include：
By inductive voltage divider T0As standard potential transformer, connection inductive voltage divider T0, double-stage voltage transformer T to be measuredX
And tester；
Adjustment tester reading dial makes zero indicator nulling；
Power supply is opened, measures double-stage voltage transformer T to be measuredXRelative to inductive voltage divider T0Error, then twin-stage to be measured electricity
Press transformer TXError be wherein ε0It is inductive voltage divider T0Error.
Preferably, when double-stage voltage transformer to be measured is the double-stage voltage transformer of low accuracy grade of the present invention
When, the inductive voltage divider is alternatively into the double-stage voltage transformer of high accuracy grade of the present invention.
Technical scheme provided by the present invention compared with prior art, by using high-low pressure mix by technical scheme
Excitation structure is closed, so as to reduce capacitive error caused by capacitive leakage current, auxiliary iron core structual shield by electrostatic screen
The influence of stray magnetic field and stray field, reduces magnetic error, and eliminates the error of auxiliary potential transformer introducing, improves double
The class of accuracy of step voltage transformer.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is the schematic diagram of the high-low pressure composite excitation double-stage voltage transformer of the specific embodiment of the invention；
Fig. 2 is the principal voltage mutual inductance of a high-low pressure composite excitation double-stage voltage transformer of the specific embodiment of the invention
The sectional structure chart of device；
Fig. 3 is the auxiliary potential transformer of the high-low pressure composite excitation double-stage voltage transformer of the specific embodiment of the invention
Sectional structure chart；
Fig. 4 is that the principal voltage of another high-low pressure composite excitation double-stage voltage transformer of the specific embodiment of the invention is mutual
The sectional structure chart of sensor；
Fig. 5 is that the specific embodiment of the invention with inductive voltage divider calibrates high-low pressure composite excitation twin-stage of the present invention
The flow chart of the method for voltage transformer；
Fig. 6 is that the specific embodiment of the invention with inductive voltage divider calibrates high-low pressure composite excitation twin-stage of the present invention
The line map of voltage transformer.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and is not limited to embodiment described herein, there is provided these embodiments are to disclose at large and fully
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that and its
The linguistic context of association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is the schematic diagram of the high-low pressure composite excitation double-stage voltage transformer of the specific embodiment of the invention.Such as Fig. 1 institutes
Showing, the double-stage voltage transformer includes principal voltage transformer 1 and auxiliary potential transformer 2, wherein：
Principal voltage transformer 1, it includes first order iron core I, second level iron core II, first winding W1, secondary winding W2, height
Press Exciting Windings for Transverse Differential Protection W3 and low pressure Exciting Windings for Transverse Differential Protection W4.
Fig. 2 is the principal voltage mutual inductance of a high-low pressure composite excitation double-stage voltage transformer of the specific embodiment of the invention
The sectional structure chart of device.As shown in Fig. 2 low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 are wound on first order iron core I successively
On, be wound with low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 first order iron core I and second level iron core II it is stacked after successively
Coiling secondary winding W2 and first winding W1.The II of second level iron core shown in Fig. 2 is common annular core, as field core, screen
It is general to cover effect, but double-stage voltage transformer volume can be reduced.
Preferably, between the high-voltage excitation winding W3 and low pressure Exciting Windings for Transverse Differential Protection W4 and secondary winding W2 and first winding W1
Between be coated with copper foil 3, copper foil 3 is grounded by welding lead-out wire, to reduce the leakage of the capacitive between winding.
Auxiliary potential transformer 2, it is unipolar voltage transformer, and for carrying out excitation to principal voltage transformer, it includes
Iron core, auxiliary first winding W5, auxiliary secondary winding W6 and power supply winding W7.Fig. 3 is the height of the specific embodiment of the invention
Press the sectional structure chart of the auxiliary potential transformer of composite excitation double-stage voltage transformer.As shown in figure 3, auxiliary first winding
W5, auxiliary secondary winding W6 and power supply winding W7 are wound on iron core successively.
In addition, the auxiliary first winding W5 of auxiliary potential transformer 2 encourages with principal voltage transformer first winding W1 and high pressure
The W3 connections of magnetic winding, auxiliary secondary winding W6 are connected with principal voltage transformer low pressure Exciting Windings for Transverse Differential Protection W4.
Principal voltage transformer of the present invention is wound with high-voltage excitation and low pressure Exciting Windings for Transverse Differential Protection simultaneously, and mutual with boost voltage
Sensor is connected, equivalent to first order transformer and auxiliary potential transformer first winding and the secondary winding of principal voltage transformer
Parallel connection, first order mutual inductance is formed by high-voltage excitation winding, low pressure Exciting Windings for Transverse Differential Protection and first order iron core I for principal voltage transformer
Device has：
U1=-E3+I3Z3=-E'4+I3Z3 (1)
In formula, U1For primary voltage, E3For high-voltage excitation winding induced potential, E ＇4It is that the conversion of low pressure Exciting Windings for Transverse Differential Protection is arrived once
The induced potential of side, I3For electric current in high-voltage excitation winding, Z3For high-voltage excitation winding internal impedance.
When not considering auxiliary potential transformer, first order transformer is equivalent to unloaded not on-load, E'4=U'4, U'4For
Voltage of the low pressure Exciting Windings for Transverse Differential Protection output conversion to primary side.
For auxiliary potential transformer, have
U1=-E5+I5Z5=-E'6+I5Z5 (2)
In formula, E5To aid in first winding induced potential, E ＇6The induced potential of primary side is arrived for auxiliary secondary winding conversion,
I5For electric current in auxiliary first winding, Z5To aid in first winding internal impedance.
When not considering auxiliary potential transformer, first order transformer is equivalent to unloaded not on-load, E'6=U'6, U'6For
Secondary winding output conversion is aided in the voltage of primary side.
Because high-voltage excitation winding W3 and the auxiliary other specification such as first winding W5 equal turn numbers, core material are also identical,
Then the first winding internal resistance of first order transformer and auxiliary mutual inductor is identical with excitation impedance, then has E'4=E'6Release U'4=
U'6.Electric current is zero, I in the loop that low pressure Exciting Windings for Transverse Differential Protection W4 and auxiliary secondary winding W6 are formed4=0, this eliminates auxiliary
The error of transformer, i.e.,：
ε1=ε3+ε5=ε3 (3)
In formula, ε1The error of first order transformer, ε3For the no-load error of first order transformer, ε5For auxiliary mutual inductor
Error.
The second level voltage transformer that first winding W1, secondary winding W2 and second level iron core II form is by first order iron core
Pressure drop excitation, then have：
ε=ε1ε2=ε3ε2 (4)
In formula, ε2The error of second level voltage transformer.Relative to low pressure excitation double-stage voltage transformer error (ε3+ε5)
ε2Reduce ε5Influence.
Preferably, the first order iron core I of the principal voltage transformer 1 and second level iron core II is ring-type iron core, and second
Level iron core II diameter is more than center of circle when first order iron core I, second level iron core II and first order iron core I are stacked and overlapped.
Fig. 4 is that the principal voltage of another high-low pressure composite excitation double-stage voltage transformer of the specific embodiment of the invention is mutual
The sectional structure chart of sensor.As shown in figure 4, the second level iron core II of the principal voltage transformer 1 includes the ring that section is spill
Shape groove and be arranged on annular groove opening annular cover plate, be provided with insulating cell 4 between annular cover plate and annular groove, insulation serves as a contrast
Pad 4 prevents from forming short-circuit circle, and the second level iron core II is both that field core also does magnetic screen, can strengthen shield effectiveness, subtract
Few magnetic error.
Preferably, the number of turn of the high-voltage excitation winding W3 and first winding W1 and auxiliary first winding W5 number of turn phase
Deng low pressure Exciting Windings for Transverse Differential Protection W4 and auxiliary secondary winding W6 equal turn numbers.
Fig. 5 is that the specific embodiment of the invention with inductive voltage divider calibrates high-low pressure composite excitation twin-stage of the present invention
The flow chart of the method for voltage transformer.As shown in figure 5, described encouraged with inductive voltage divider calibration high-low pressure mixing of the present invention
The method of magnetic double-stage voltage transformer is from step 501.
In step 501, by inductive voltage divider T0As standard potential transformer, connection inductive voltage divider T0, twin-stage to be measured electricity
Press transformer TXAnd tester.
Fig. 6 is that the specific embodiment of the invention with inductive voltage divider calibrates high-low pressure composite excitation twin-stage of the present invention
The line map of voltage transformer.As shown in fig. 6, W30 and W10 polar ends dock and connect power supply, W30, W10 and W2 non-polar end pair
Connect and connect power supply, W20 connect tester K, W2 polarity termination tester D, W1, W3 dock with W5 polar ends and connects power supply, W1, W3 and
W5 non-polar ends are docked and connect power supply, and W4 docks with W6 polar ends, and non-polar end is docked and is grounded, and W7 connects tester a and x, school
Test instrument D ground connection.
In step 502, adjustment tester reading dial makes zero indicator nulling；
In step 503, power supply is opened, measures double-stage voltage transformer T to be measuredXRelative to inductive voltage divider T0Error, then
Double-stage voltage transformer T to be measuredXError be wherein ε0It is inductive voltage divider T0 error.
Preferably, when double-stage voltage transformer to be measured is the double-stage voltage transformer of low accuracy grade of the present invention
When, the inductive voltage divider is alternatively into the double-stage voltage transformer of high accuracy grade of the present invention.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly being defined in addition wherein.All references " one/described/be somebody's turn to do【Device, component etc.】" all it is opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurately order, unless explicitly stated otherwise.
Claims (7)
1. a kind of high-low pressure composite excitation double-stage voltage transformer, it is characterised in that the double-stage voltage transformer includes：
Principal voltage transformer 1, it includes first order iron core I, second level iron core II, first winding W1, secondary winding W2, high pressure and encouraged
Magnetic winding W3 and low pressure Exciting Windings for Transverse Differential Protection W4, wherein, low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 are wound on the first order successively
On iron core I, be wound with low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 first order iron core I and second level iron core II it is stacked after
Coiling secondary winding W2 and first winding W1 successively；
Auxiliary potential transformer 2, it is unipolar voltage transformer, for principal voltage transformer carry out excitation, it include iron core,
First winding W5, auxiliary secondary winding W6 and power supply winding W7 are aided in, wherein, auxiliary first winding W5, auxiliary secondary winding W6
It is wound on successively on iron core with power supply winding W7, and aids in first winding W5 to be encouraged with principal voltage transformer first winding W1 and high pressure
The W3 connections of magnetic winding, auxiliary secondary winding W6 are connected with principal voltage transformer low pressure Exciting Windings for Transverse Differential Protection W4.
2. double-stage voltage transformer according to claim 1, it is characterised in that the first order iron of the principal voltage transformer
Core I and second level iron core II is ring-type iron core, and second level iron core II diameter is more than first order iron core I, second level iron core II
The center of circle overlaps when being stacked with first order iron core I.
3. double-stage voltage transformer according to claim 1, it is characterised in that the second level iron of the principal voltage transformer
Core II is four annulus, is separately mounted to be wound with low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3 first order iron core I's
Inside and outside four sides up and down, wherein the annulus of upside and the first order iron core for being wound with low pressure Exciting Windings for Transverse Differential Protection W4 and high-voltage excitation winding W3
I is lined with insulating materials and prevents from forming short-circuit circle.
4. double-stage voltage transformer according to claim 1, it is characterised in that the number of turn of the high-voltage excitation winding W3 with
First winding W1 and auxiliary first winding W5 equal turn numbers, low pressure Exciting Windings for Transverse Differential Protection W4 and the number of turn phase for aiding in secondary winding W6
Deng.
5. double-stage voltage transformer according to claim 1, it is characterised in that the high-voltage excitation winding W3 and low pressure are encouraged
Copper foil is coated between magnetic winding W4 and between secondary winding W2 and first winding W1, copper foil is grounded by welding lead-out wire.
A kind of 6. method for calibrating any one double-stage voltage transformer in claim 1 to 5, it is characterised in that methods described
Including：
By inductive voltage divider T0As standard potential transformer, connection inductive voltage divider T0, double-stage voltage transformer T to be measuredXAnd school
Test instrument；
Adjustment tester reading dial makes zero indicator nulling；
Power supply is opened, measures double-stage voltage transformer T to be measuredXRelative to inductive voltage divider T0Error ε, then dual stage voltage to be measured
Transformer TXError be εX=ε+εO, wherein being inductive voltage divider T0Error.
7. according to the method for claim 6, it is characterised in that when double-stage voltage transformer to be measured is in claim 1 to 5
During the double-stage voltage transformer of any one low accuracy grade, the inductive voltage divider is alternatively appointed into claim 1 to 5
The double-stage voltage transformer for a high accuracy grade of anticipating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710624564.6A CN107424814B (en) | 2017-07-27 | 2017-07-27 | High-low voltage hybrid excitation two-stage voltage transformer and calibration method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624564.6A CN107424814B (en) | 2017-07-27 | 2017-07-27 | High-low voltage hybrid excitation two-stage voltage transformer and calibration method thereof |
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| Publication Number | Publication Date |
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| CN107424814A true CN107424814A (en) | 2017-12-01 |
| CN107424814B CN107424814B (en) | 2020-02-07 |
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Cited By (4)
| 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 |
| 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 |
| WO2021088200A1 (en) * | 2019-11-05 | 2021-05-14 | 中国电力科学研究院有限公司 | Dual-stage magnetic excitation high-voltage proportional standard apparatus and error compensation method |
| CN113219226A (en) * | 2021-05-26 | 2021-08-06 | 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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| 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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| 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 |
Cited By (6)
| 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 |
| WO2021088200A1 (en) * | 2019-11-05 | 2021-05-14 | 中国电力科学研究院有限公司 | Dual-stage magnetic excitation high-voltage proportional standard apparatus and error compensation method |
| 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 |
| CN113219226A (en) * | 2021-05-26 | 2021-08-06 | 中国电力科学研究院有限公司 | Induction voltage divider based on multistage excitation and manufacturing method thereof |
| 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 | Publication date |
|---|---|
| CN107424814B (en) | 2020-02-07 |
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