CN107202966A - The measuring method and system of a kind of alternate stray field of Transformer Winding - Google Patents
The measuring method and system of a kind of alternate stray field of Transformer Winding Download PDFInfo
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- CN107202966A CN107202966A CN201710380093.9A CN201710380093A CN107202966A CN 107202966 A CN107202966 A CN 107202966A CN 201710380093 A CN201710380093 A CN 201710380093A CN 107202966 A CN107202966 A CN 107202966A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/028—Electrodynamic magnetometers
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Abstract
This application discloses the measuring system and method for a kind of alternate stray field of Transformer Winding, wherein, the measuring system of the alternate stray field of the Transformer Winding, including：Power supply；The Transformer Winding electrically connected with the power supply；It is communicated in the short-circuiting means of circuit between the power supply and the Transformer Winding；The magnetic induction sensor in the adjacent winding centre position of each Transformer Winding is arranged at, the magnetic induction sensor is used to sense the stray field between adjacent winding；The electro-motive force measurement device electrically connected with the magnetic induction sensor；The magnetic density computing device electrically connected with the electro-motive force measurement device.The technical scheme of the application can improve the precision of measurement stray field.
Description
Technical field
The application is related to technical field of electric power, more particularly to a kind of alternate stray field of Transformer Winding measuring method and be
System.
Background technology
Alternating voltage can be changed into by power transformer as a kind of static electrical equipment by electromagnetic induction rule
The voltage that frequency identical is another or several numerical value are different.The power transformer applied in power system, its capacity is larger,
The transformation ability of internal winding is universal relatively strong, therefore easily produces the folder as caused by its stray field, magnetic screen material overheat and show
As.
In order to reduce the situation that the transformer as caused by stray field is overheated, obtained in the prior art usually using Hall sensor
Stray field signal is taken, signal transacting is then carried out by computer, stray field magnetic flux density component is analyzed, so that it is determined that
The size of the stray field of transformer.
But detection method of the prior art, because Hall sensor is limited by the limit of detection volume and test position
System, causes measurement of the existing detection mode to Magnetic Leakage Field of Transformer often to there is larger error, and then influence to transformer
Test and appraisal.
The content of the invention
This application provides the measuring method and system of a kind of alternate stray field of Transformer Winding, to solve existing detection
There is larger error in measurement of the mode to Magnetic Leakage Field of Transformer, the problem of influenceing the test and appraisal of transformer.
In a first aspect, this application provides a kind of measuring system of the alternate stray field of Transformer Winding, including：Power supply electricity
Source；The Transformer Winding electrically connected with the power supply；It is connected to the top-stitching of the power supply and the Transformer Winding
The short-circuiting means on road；It is arranged at the magnetic induction sensor in the adjacent winding centre position of each Transformer Winding, the magnetic induction
Sensor is used to sense the stray field between adjacent winding；The electro-motive force measurement device electrically connected with the magnetic induction sensor；With
The magnetic density computing device of the electro-motive force measurement device electrical connection.
Alternatively, the magnetic induction sensor includes：It is respectively arranged in transformer in the middle of the adjacent winding of iron yoke up and down
The magnetic induction sensor of line；It is respectively arranged at the magnetic induction sensor of Transformer Winding end horizontal line；And it is arranged at transformation
The magnetic induction sensor of the radial center line of device winding.
Alternatively, the magnetic induction sensor, including：The electromagnetic induction coil accumulated with the default number of turn and given cross-sectional；
The survey magnetic sheet of the electromagnetic induction coil is fixedly connected with, wherein, the survey magnetic sheet outer surface is coated with magnetic shielding material.
Alternatively, the electro-motive force measurement device, including：The mean voltage electrically connected with the magnetic induction sensor
Table；And, the electromotive force integral measurement device electrically connected with the magnetic induction sensor；Wherein, the mean voltmeter and
Electromotive force integral measurement device is electrically connected with the magnetic density computing device respectively.
Alternatively, the electromotive force integral measurement device includes：Ballistic galvanometer, electronic integrator and magneto-electric magnetic-flux meter
Any of.
Alternatively, the electro-motive force measurement device includes：The voltage measurement oscillography electrically connected with the magnetic induction sensor
Device, the voltage measurement oscillograph is also electrically connected with the magnetic density computing device.
Alternatively, the measuring system also includes：The motor being connected with the magnetic induction sensor, the motor is used
Rotated in controlling the magnetic induction sensor perpendicular to the stray field axis direction.
Second aspect, the technical scheme of the application additionally provides a kind of measuring method of the alternate stray field of Transformer Winding,
For the measuring system of the alternate stray field of Transformer Winding any one of above-mentioned technical proposal, the measuring method bag
Include：According to the distribution characteristics of the alternate stray field of Transformer Winding, the survey magnetic potential of magnetic induction sensor is set；Using with the magnetic
The electro-motive force measurement device that inductive pick-up is connected, measures the induced electromotive force for surveying magnetic potential；According to the induced electricity
Kinetic potential, calculates the Magnetic fluxleakage distribution for surveying magnetic potential.
Alternatively, the Magnetic fluxleakage distribution that survey magnetic potential is calculated according to induced electromotive force, including：According to the induced electricity
Kinetic potential, the number of turn of the magnetic induction sensor and sectional area and the magnetic induction sensor are fast relative to the angle of the stray field
Degree, calculates the magnetic density for surveying magnetic potential；According to the integration amount of the induced electromotive force, and the magnetic induction sensor
The number of turn and sectional area, calculate the magnetic density variable quantity for surveying magnetic potential.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
A kind of structural representation of the measuring system for the alternate stray field of Transformer Winding that Fig. 1 provides for the embodiment of the present application
Figure；
A kind of Distribution of Magnetic Field schematic diagram for single transformer winding that Fig. 2 provides for the embodiment of the present application；
A kind of distribution schematic diagram for magnetic induction sensor that Fig. 3 provides for the embodiment of the present application；
A kind of structural representation for magnetic induction sensor that Fig. 4 provides for the embodiment of the present application；
The structural representation for the first electro-motive force measurement device that Fig. 5 provides for the embodiment of the present application；
The structural representation for second of electro-motive force measurement device that Fig. 6 provides for the embodiment of the present application；
A kind of flow signal of the measuring method for the alternate stray field of Transformer Winding that Fig. 7 provides for the embodiment of the present application
Figure.
Fig. 1 is into embodiment illustrated in fig. 7, and the corresponding relation of each structure and reference is as follows：
1- power supplies, 2- Transformer Windings, 3- short-circuiting means, 4- magnetic induction sensors, 41- electromagnetic induction coils, 42-
Survey magnetic sheet, 5- electro-motive force measurements device, 51- mean voltmeters, 52- electromotive force integral measurements device, 53- voltage measurement oscillographys
Device, 6- magnetic densities computing device, above and below 7- iron yokes, 8- motor.
Embodiment
Referring to Fig. 1, a kind of structure of the measuring system of the alternate stray field of Transformer Winding 2 provided for the embodiment of the present application
Schematic diagram.As shown in figure 1, the measuring system of the alternate stray field of Transformer Winding 2 includes：
Power supply 1.The Transformer Winding 2 electrically connected with the power supply 1.It is communicated in the power supply 1 and institute
State the short-circuiting means 3 of circuit between Transformer Winding 2.
The Magnetic fluxleakage distribution situation of primary study Transformer Winding 2 in the short-circuit state in the embodiment of the present application, thus it is logical
Design short-circuiting means 3 is crossed, short circuit can be carried out to Transformer Winding 2, so as to accurate research Transformer Winding 2 in short-circuit shape
Magnetic fluxleakage distribution situation under state.In addition, the transformer in the embodiment of the present application is three-phase two-simulation transformer.
It is arranged at the magnetic induction sensor 4 in the adjacent winding centre position of each Transformer Winding 2, the magnetic strength inductive sensing
Device 4 is used to sense the stray field between adjacent winding.
Magnetic induction sensor 4 is arranged on the adjacent winding centre position of each Transformer Winding 2, the feelings passed through in magnetic induction line
Under condition, induced field current and induced electromotive force can be produced inside magnetic induction sensor 4 in the presence of magnetic induction line, and then
By calculating the induced electromotive force, the Magnetic Induction Density Distribution in adjacent winding centre position can be accurately measured, i.e., it is accurate to survey
Measure the stray field between adjacent winding.By the way that magnetic induction sensor 4 is arranged in the middle of the adjacent winding of each Transformer Winding 2
Position, can sense the Magnetic fluxleakage distribution between adjacent winding, and foundation is provided for the accurate measurement of stray field.
The electro-motive force measurement device 5 electrically connected with the magnetic induction sensor 4；It is electrically connected with the electro-motive force measurement device 5
The magnetic density computing device 6 connect.The device such as including computer of magnetic density computing device 6.
Because magnetic induction sensor 4 is arranged at the centre position of Transformer Winding 2, it can be produced in the presence of winding magnetic field
Raw induced-current and induced electromotive force, therefore electrically connected by electro-motive force measurement device 5 with magnetic induction sensor 4, can be accurate
Induced electromotive force in the middle of measuring transformer winding 2, and be electrically connected by magnetic density computing device 6 with electro-motive force measurement device 5
Connect, the magnetic density in the centre position of Transformer Winding 2 can accurately be calculated by the induced electromotive force of magnetic induction sensor 4.
In the application embodiment illustrated in fig. 1, magnetic induction sensor 4 is arranged in the adjacent winding of each Transformer Winding 2
Between position, so as to sense the stray field between adjacent winding, electro-motive force measurement device 5 is electrically connected with magnetic induction sensor 4, energy
The electromotive force of magnetic induction sensor 4 is enough detected, and then magnetic density computing device 6 can accurately be calculated by the electromotive force and obtained
The magnetic density of position measured by magnetic induction sensor 4.Compared to the existing side that Magnetic fluxleakage distribution is detected by Hall sensor
Formula, detects small volume, and the measurement error to Magnetic Leakage Field of Transformer is smaller.
For Transformer Winding 2, single transformer winding 2 is often cylindrical, its Distribution of Magnetic Field as shown in Fig. 2
For winding adjacent for transformer, the magnetic field between adjacent winding can be interacted, therefore, and the stray field for adjacent winding is surveyed
Amount, it is necessary in view of in transformer up and down iron yoke 7, the end horizontal line of Transformer Winding 2, Transformer Winding 2 radial center line
Deng position.Accordingly, for the Magnetic fluxleakage distribution of accurate measuring transformer winding 2, as shown in figure 3, magnetic induction sensor 4 is wrapped
Include：
The magnetic induction sensor 4 of the adjacent winding medium line of iron yoke 7 up and down is respectively arranged in transformer.
It is respectively arranged at the magnetic induction sensor 4 of the end horizontal line of Transformer Winding 2.
And it is arranged at the magnetic induction sensor 4 of the radial center line of Transformer Winding 2.
By in transformer up and down adjacent winding, the end horizontal line of Transformer Winding 2 and the width of iron yoke 7 to center line
Position sets magnetic induction sensor 4 respectively, can be respectively induced iron yoke 7 above and below transformer, winding overhang horizontal line and radial
The Magnetic fluxleakage distribution of center line, and then precise integration is carried out to the Magnetic fluxleakage distribution of each position of Transformer Winding 2, it is accurate to obtain
To the overall Distribution of Magnetic Field of Transformer Winding 2.
Wherein, as shown in figure 4, the magnetic induction sensor 4 described in the present embodiment includes：With the default number of turn and default section
The electromagnetic induction coil 41 of area；
The survey magnetic sheet 42 of the electromagnetic induction coil 41 is fixedly connected with, wherein, survey magnetic sheet 42 outer surface is coated with magnetic
Shielding material.
Electromagnetic induction coil 41 has the default number of turn and given cross-sectional product, when the magnetic induction line in Transformer Winding 2 is passed through,
Induced-current and induced electromotive force can be produced, according to formula：Electromagnetic induction coil can be obtained
The magnetic density of 41 positions；Wherein, N is that coil turn, A are the sectional area of Transformer Winding 2, B0For magnetic density, it is
Amount to be asked, t is the time, and φ is the magnetic flux through coil when electromagnetic induction coil 41 rotates, twitches and vibrated, and e is induced electricity
Kinetic potential.
Alternatively, as shown in figure 5, electro-motive force measurement device includes：The average value electrically connected with the magnetic induction sensor 4
Voltmeter 51；And, the electromotive force integral measurement device 52 electrically connected with the magnetic induction sensor 4；Wherein, mean voltage
Table 51 and electromotive force integral measurement device 52 are electrically connected with the magnetic density computing device 6 respectively.
Mean voltmeter 51 is electrically connected with magnetic induction sensor 4, for measuring average voltage, i.e., average induction electric
Gesture, and then calculate the magnetic density by magnetic induction sensor 4；And electromotive force integral measurement device 52 is used to measure induction electric
The integration amount of gesture, and then calculate by the integration amount of the induced electromotive force change of the magnetic density by magnetic induction sensor 4
Amount.
Wherein, electromotive force integral measurement device 52 includes：In ballistic galvanometer, electronic integrator and magneto-electric magnetic-flux meter
It is any.Specifically, with reference to above-mentioned calculation formula：Understand,Electromotive force integration is surveyed
Amount device 52 can measure the integration amount for obtaining induced electromotive force, i.e. ∫ edt；So after measurement obtains ∫ edt, due to transformer
The number of turn N and sectional area A of winding 2 are known quantity, then the rate of change Δ B of magnetic density0Also it can be obtained by calculating.
In addition, as shown in fig. 6, electro-motive force measurement device also includes：The voltage electrically connected with the magnetic induction sensor 4 is surveyed
Oscillograph 53 is measured, the voltage measurement oscillograph 53 is also electrically connected with the magnetic density computing device 6.
Wherein, in order to be measured to magnetic density, as shown in fig. 6, measuring system also includes：With magnetic induction sensor 4
Connected motor 8, motor 8 is used to control magnetic induction sensor 4 to rotate perpendicular to the stray field axis direction.
When the magnetic field intensity between the adjacent winding of transformer is constant, magnetic strength can be driven by motor 8 (angular speed is ω)
Coil is answered to be rotated around perpendicular to magnetic field axis direction to be measured, now φ=AB0sinωt；Induced electromotive force is accordingly：In known induced electromotive force e, number of turn N and sectional area A, and motor 8
In the case of angular velocity omega, it can be calculated by the formula and obtain magnetic density B0。
Similarly, when the magnetic flux in magnetic field to be measured is changed over time, it is necessary to avoid coil and magnetic field relative motion, directly survey
Measure the induced electromotive force e of coil, you can determine magnetic density B0；Specifically, if the change of the magnetic flux in magnetic field to be measured turns to φ
=φ0During sin ω t, according to formula：Understand：E=-NA ω B0cosωt.It can be calculated according to the formula
Magnetic density B0。
Referring to Fig. 7, a kind of stream of the measuring method for the alternate stray field of Transformer Winding that Fig. 7 provides for the embodiment of the present application
Journey schematic diagram, the measuring method of the alternate stray field of the Transformer Winding be used for transformer any one of above-described embodiment around
The measuring system of the alternate stray field of group, as shown in fig. 7, the measuring method comprises the following steps：
S110：According to the distribution characteristics of the alternate stray field of Transformer Winding, the survey magnetic potential of magnetic induction sensor is set.
The distribution characteristics of the alternate stray field of Transformer Winding can be found in Fig. 2, and magnetic strength inductive sensing is set according to the distribution characteristics
Adjacent winding medium line, Transformer Winding end horizontal line and the transformer of iron yoke above and below in the survey magnetic potential of device, such as transformer
The positions such as the radial center line of winding.Other magnetic induction sensor can produce induced-current and sense in the presence of magnetic induction line
Electromotive force is answered, so as to be the measurable magnetic density for obtaining the position, i.e. Magnetic fluxleakage distribution according to the induced electromotive force.
S120：Using the electro-motive force measurement device being connected with magnetic induction sensor, the induction electric of magnetic potential is surveyed in measurement
Gesture.
Electro-motive force measurement device is electrically connected with magnetic induction sensor, can measure the induced electricity obtained in magnetic induction sensor
Kinetic potential, and then the Magnetic fluxleakage distribution situation obtained between the adjacent winding of transformer is calculated according to the induced electromotive force.
S130：According to induced electromotive force, the Magnetic fluxleakage distribution for surveying magnetic potential is calculated.Wherein, step S130：According to
Induced electromotive force calculates the Magnetic fluxleakage distribution for surveying magnetic potential, comprises the following steps：
According to the induced electromotive force, the number of turn of the magnetic induction sensor and sectional area and the magnetic induction sensor
Relative to the angular speed of the stray field, the magnetic density for surveying magnetic potential is calculated.
Specifically, can by Motor Control magnetic induction coil in adjacent winding around perpendicular to magnetic field axis direction to be measured
Rotate, now φ=AB0sinωt；Correspondingly, induced electromotive force is
Know induced electromotive force e, the number of turn N of magnetic induction sensor (magnetic induction coil), the angular velocity omega of sectional area A and magnetic induction sensor
In the case of, it can be calculated by above-mentioned formula and obtain magnetic density B0。
To sum up, in the application embodiment illustrated in fig. 7, magnetic induction sensor is arranged at the adjacent winding of each Transformer Winding
Centre position, so as to sense the stray field between adjacent winding, electro-motive force measurement device is electrically connected with magnetic induction sensor, energy
The electromotive force of magnetic induction sensor is enough detected, and then magnetic density computing device can accurately be calculated by the electromotive force and obtain magnetic
The magnetic density of position measured by inductive pick-up.Compared to existing by way of Hall sensor detects Magnetic fluxleakage distribution,
Small volume is detected, the measurement error to Magnetic Leakage Field of Transformer is smaller.
Between the embodiment of each in this specification identical similar part mutually referring to.Implement especially for method
For example, because it is substantially similar to system embodiment, so description is fairly simple, related part is referring in system embodiment
Explanation.
Invention described above embodiment is not intended to limit the scope of the present invention..
Claims (9)
1. a kind of measuring system of the alternate stray field of Transformer Winding, it is characterised in that including：
Power supply (1)；
The Transformer Winding (2) electrically connected with the power supply (1)；
It is connected to the short-circuiting means (3) of circuit between the power supply (1) and the Transformer Winding (2)；
It is arranged at the magnetic induction sensor (4) in the adjacent winding centre position of each Transformer Winding (2), the magnetic strength inductive sensing
Device (4) is used to sense the stray field between adjacent winding；
The electro-motive force measurement device (5) electrically connected with the magnetic induction sensor (4)；
The magnetic density computing device (6) electrically connected with the electro-motive force measurement device (5).
2. measuring system according to claim 1, it is characterised in that the magnetic induction sensor (4), including：
Two magnetic induction sensors of the adjacent winding medium line of iron yoke (7) up and down are respectively arranged in transformer；
It is respectively arranged at two magnetic induction sensors of Transformer Winding (2) end horizontal line；And,
It is arranged at the magnetic induction sensor of the radial center line of Transformer Winding (2).
3. measuring system according to claim 1, it is characterised in that the magnetic induction sensor (4), including：
The electromagnetic induction coil (41) accumulated with the default number of turn and given cross-sectional；
The survey magnetic sheet (42) of the electromagnetic induction coil (41) is fixedly connected with, wherein, described survey magnetic sheet (42) outer surface is coated with
Magnetic shielding material.
4. measuring system according to claim 1, it is characterised in that the electro-motive force measurement device (5), including：
The mean voltmeter (51) electrically connected with the magnetic induction sensor (4)；And,
The electromotive force integral measurement device (52) electrically connected with the magnetic induction sensor (4)；
Wherein, the mean voltmeter (51) and electromotive force integral measurement device (52) respectively with the magnetic density computing device
(6) electrically connect.
5. measuring system according to claim 4, it is characterised in that the electromotive force integral measurement device (52) includes：
Any of ballistic galvanometer, electronic integrator and magneto-electric magnetic-flux meter.
6. measuring system according to claim 1, it is characterised in that the electro-motive force measurement device (5), including：
The voltage measurement oscillograph (53) electrically connected with the magnetic induction sensor (4), the voltage measurement oscillograph (53) is also
Electrically connected with the magnetic density computing device (6).
7. measuring system according to claim 1, it is characterised in that also include：
The motor (8) being connected with the magnetic induction sensor (4), the motor (8) is used to control the magnetic strength inductive sensing
Device (4) rotates perpendicular to the axis direction of the stray field.
8. the measuring method of the alternate stray field of a kind of Transformer Winding, it is characterised in that for any one of claim 1-7 institutes
The measuring system for the alternate stray field of Transformer Winding stated, the measuring method includes：
According to the distribution characteristics of the alternate stray field of Transformer Winding, the survey magnetic potential of magnetic induction sensor is set；
Using the electro-motive force measurement device being connected with the magnetic induction sensor, the induction electric for surveying magnetic potential is measured
Gesture；
According to the induced electromotive force, the Magnetic fluxleakage distribution for surveying magnetic potential is calculated.
9. measuring method according to claim 8, it is characterised in that described according to induced electromotive force, calculates and surveys magnetic potential
Magnetic fluxleakage distribution, including：
It is relative according to the induced electromotive force, the number of turn of the magnetic induction sensor and sectional area and the magnetic induction sensor
In the angular speed of the stray field, the magnetic density for surveying magnetic potential is calculated；
According to the number of turn and sectional area of the integration amount of the induced electromotive force, and the magnetic induction sensor, described survey is calculated
The magnetic density variable quantity of magnetic potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380093.9A CN107202966B (en) | 2017-05-25 | 2017-05-25 | The measurement method and system of a kind of alternate magnetic flux leakage of transformer winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380093.9A CN107202966B (en) | 2017-05-25 | 2017-05-25 | The measurement method and system of a kind of alternate magnetic flux leakage of transformer winding |
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| Publication Number | Publication Date |
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| CN107202966A true CN107202966A (en) | 2017-09-26 |
| CN107202966B CN107202966B (en) | 2019-09-24 |
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Cited By (5)
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| CN108551212A (en) * | 2018-05-13 | 2018-09-18 | 郭小红 | A kind of collection method of supplying power to towards transformer fault monitoring device |
| CN108572334A (en) * | 2018-06-01 | 2018-09-25 | 南方电网科学研究院有限责任公司 | Abnormal magnetic flux leakage monitoring system for transformer |
| CN109858074A (en) * | 2018-12-13 | 2019-06-07 | 云南电网有限责任公司电力科学研究院 | A kind of simulation method of the transformer oil flow surge based on finite volume method |
| CN113791366A (en) * | 2021-09-15 | 2021-12-14 | 华北电力大学 | Transformer fault online detection system and method based on magnetic flux leakage |
| CN114200349A (en) * | 2021-11-23 | 2022-03-18 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation device and method based on uninterrupted power supply detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109858074A (en) * | 2018-12-13 | 2019-06-07 | 云南电网有限责任公司电力科学研究院 | A kind of simulation method of the transformer oil flow surge based on finite volume method |
| CN113791366A (en) * | 2021-09-15 | 2021-12-14 | 华北电力大学 | Transformer fault online detection system and method based on magnetic flux leakage |
| CN114200349A (en) * | 2021-11-23 | 2022-03-18 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation device and method based on uninterrupted power supply detection |
| WO2023093660A1 (en) * | 2021-11-23 | 2023-06-01 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation device and method based on non-power cut detection |
| CN114200349B (en) * | 2021-11-23 | 2023-10-13 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation method based on uninterrupted power supply detection |
| JP7461568B2 (en) | 2021-11-23 | 2024-04-03 | 国網山西省電力公司電力科学研究院 | Apparatus and method for evaluating the degree of deformation of transformer windings based on uninterruptible power failure detection |
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Effective date of registration: 20201105 Address after: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee after: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Address before: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee before: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Patentee before: SHENYANG TRANSFORMER RESEARCH INSTITUTE Co.,Ltd. |