CN206074213U - The modal idenlification system that a kind of Transformer Winding loosens - Google Patents
The modal idenlification system that a kind of Transformer Winding loosens Download PDFInfo
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- CN206074213U CN206074213U CN201621143363.1U CN201621143363U CN206074213U CN 206074213 U CN206074213 U CN 206074213U CN 201621143363 U CN201621143363 U CN 201621143363U CN 206074213 U CN206074213 U CN 206074213U
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Abstract
This utility model is the modal idenlification system loosened with regard to a kind of Transformer Winding, system includes signal generator, power amplifier, axial excitation device, width to vibrator, multiple acceleration transducers, preprocessor and model analyses device, wherein, the outfan of signal generator electrically connects the input of power amplifier；The outfan of power amplifier is electrically connected the input of axial direction and width to vibrator；Axially connection transformer winding is distinguished to vibrator with width, and axial excitation device is located at the top of Transformer Winding axial direction side, width is located at outside of the Transformer Winding width to side to vibrator；The input of preprocessor is electrically connected with width to the outfan of vibrator axially；Acceleration transducer is uniformly arranged on the upper, middle and lower of Transformer Winding, and acceleration transducer is electrically connected the input of preprocessor；The outfan of preprocessor electrically connects the input of model analyses device.The system is used for the Modal detection of Transformer Winding, recognizes slight deformation.
Description
Technical field
This utility model is related to winding failure testing equipment technical field, more particularly to the mould that a kind of Transformer Winding loosens
State identifying system.
Background technology
With the increase of net capacity, the safe operation and power supply reliability to power system is put forward higher requirement,
No. one time electrical equipment directly affects stablizing for power system, and power transformer is topmost in electrical network once electrically to set energetically
Standby, whether power transformer safe operation directly affects the safe and stable operation of power system.The electric power of longtime running is become
For depressor, if keeping in repair to failure not in time, transformator can be not only damaged, more shadow can be caused to the normal operation of electrical network
Ring, result even in the collapse of power system, therefore for transformer fault diagnosis have unusual meaning with monitoring.
Winding in Power Transformer anti-short circuit capability deficiency becomes the initiation topmost reason of Accident of Transformer, transformator around
Group loosens or deformation is a key factor for causing winding anti-short circuit capability not enough.Common Winding in Power Transformer loosens and event
Barrier detection has Frequency Response Analysis method and short circuit impedance method, and wherein Frequency Response Analysis method is that winding one end is injected swept-frequency signal, another
The signal that end measurement is passed over, calculates the transmission function of winding, then the change according to transmission function before and after winding impact, meter
Calculation obtains whether winding deforms；Short circuit impedance method be by measure winding impact before and after short circuit in winding impedance change come detect around
Whether group deforms.
But, Frequency Response Analysis method and short circuit impedance method are all to adopt electric measuring method, only serious to winding deformation extent feelings
Condition is more effective, to winding slight deformation and insensitive, and can not be monitored on-line.
Utility model content
Exist in correlation technique existing winding loosening detection method insensitive to winding slight deformation to overcome, and can not
The problem monitored on-line, this utility model provide the modal idenlification system that a kind of Transformer Winding loosens.
In order to solve above-mentioned technical problem, this utility model provides following technical scheme：
The modal idenlification system that the Transformer Winding that this utility model is provided loosens is used for the Modal detection of Transformer Winding,
The system includes signal generator, power amplifier, axial excitation device, width to vibrator, multiple acceleration transducers, pre- place
Reason device and model analyses device, wherein：
The outfan of the signal generator electrically connects the input of the power amplifier；
The outfan of the power amplifier is electrically connected the input of the axial excitation device and width to vibrator；
The axial excitation device connects the Transformer Winding, and the axial excitation device is located at the Transformer Winding axle
To the top of side；
The width connects the Transformer Winding to vibrator, and the width is located at the Transformer Winding width to vibrator
To the outside of side；
The axial excitation device and width are electrically connected the input of the preprocessor to the outfan of vibrator；
The acceleration transducer is uniformly arranged on the upper, middle and lower of the Transformer Winding, and the acceleration
Degree sensor is electrically connected the input of the preprocessor；
The outfan of the preprocessor electrically connects the input of the model analyses device.
Preferably, in the modal idenlification system that above-mentioned Transformer Winding loosens, the bottom of the axial excitation device arranges the
One push rod, the axial excitation device connect the Transformer Winding, and the axle of the axial excitation device by first push rod
The axis place straight line parallel of line place straight line and the Transformer Winding.
Preferably, in the modal idenlification system that above-mentioned Transformer Winding loosens, the bottom of first push rod arranges first
Pressure transducer, the tip contact of the first sensor and the Transformer Winding, and the first pressure sensor are electrically connected
Connect the input of the preprocessor.
Preferably, in the modal idenlification system that above-mentioned Transformer Winding loosens, the width arranges the to the bottom of vibrator
Two push rods, the width connect the Transformer Winding by second push rod to vibrator, and the width is to the axle of vibrator
Line place straight line is vertical with the axis place straight line of the Transformer Winding.
Preferably, in the modal idenlification system that above-mentioned Transformer Winding loosens, the bottom of second push rod arranges second
Pressure transducer, the contacts side surfaces of the second pressure sensor and the Transformer Winding, and the second pressure sensor
Electrically connect the input of the preprocessor.
Preferably, in the modal idenlification system that above-mentioned Transformer Winding loosens, the axial excitation device and width are to vibrator
Include Electrodynamic Vibrators.
Preferably, in the modal idenlification system that above-mentioned Transformer Winding loosens, the acceleration transducer includes that vibration adds
Velocity sensor.
Preferably, in the modal idenlification system that above-mentioned Transformer Winding loosens, the model analyses device includes DHMA mode
Analyzer.
The technical scheme that embodiment of the present utility model is provided can include following beneficial effect：
The modal idenlification system that the Transformer Winding that this utility model is provided loosens is used for the Modal detection of Transformer Winding,
The system includes signal generator, power amplifier, axial excitation device, width to vibrator, multiple acceleration transducers, pretreatment
Device and model analyses device, wherein, the outfan of signal generator electrically connects the input of power amplifier；Power amplifier it is defeated
Go out end and be electrically connected the input of axial excitation device and width to vibrator；Axial excitation device connection transformer winding, and axially
Vibrator is located at the top of Transformer Winding axial direction side；Width is located to vibrator and is become to vibrator connection transformer winding, and width
Outside of the depressor winding width to side；Axial excitation device and width are electrically connected the input of preprocessor to the outfan of vibrator
End；Acceleration transducer is uniformly arranged on the upper, middle and lower of Transformer Winding, and acceleration transducer is electrically connected
The input of preprocessor；The outfan of preprocessor electrically connects the input of model analyses device.During work, signal generator master
It is used to produce white noise signal, white noise signal is amplified through power amplifier, direct drive axial excitation device is to becoming
Depressor winding enters row energization so that Transformer Winding produces axial vibration, or drives width to carry out to vibrator to Transformer Winding
Excitation so that Transformer Winding produces width to vibration, the axial vibration signal or width of acceleration transducer collection Transformer Winding
To vibration signal, and force signal or width are vibrated to vibrator vibration force signal simultaneous transmission to preprocessor with axial excitation device,
Preprocessor carries out pretreatment to signal, obtains each measuring point frequency response function, and pretreated data are imported model analyses
Device, finally obtains axial direction or width to modal parameter, and then analysis obtains the modal parameter of Transformer Winding loosening.This utility model
The modal idenlification system that the Transformer Winding of offer loosens analyzes the mechanical property of Transformer Winding by vibratory drilling method, can be timely
It was found that micro-strain, and on-line monitoring can be realized.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
This utility model can be limited.
Description of the drawings
During accompanying drawing herein is merged in description and the part of this specification is constituted, show and meet of the present utility model
Embodiment, and be used for explaining principle of the present utility model together with description.
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, for ordinary skill people
For member, without having to pay creative labor, can be with according to these other accompanying drawings of accompanying drawings acquisition.
The structural representation of the modal idenlification system that Fig. 1 is loosened for a kind of Transformer Winding that this utility model embodiment is provided
Figure；
Axial vibrator in the modal idenlification system that Fig. 2 is loosened for the Transformer Winding that this utility model embodiment is provided
Use state figure；
In the modal idenlification system that Fig. 3 is loosened for the Transformer Winding that this utility model embodiment is provided, width is to vibrator
Use state figure；
Fig. 1-Fig. 3 symbols are represented：
1- signal generators, 2- power amplifiers, 3- axial excitation devices, the first push rods of 31-, 32- first pressure sensors,
4- width to vibrator, the second push rods of 41-, 42- second pressure sensors, locate in advance by 5- Transformer Windings, 6- acceleration transducers, 7-
Reason device, 8- model analyses devices.
Specific embodiment
Here in detail exemplary embodiment will be illustrated, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with this utility model.Conversely, they be only with such as
The example of consistent apparatus and method in terms of being described in detail in appended claims, more of the present utility model.
Mode is the natural vibration characteristic of frame for movement, and the mode of frame for movement is typically by natural frequency, damping ratio, mould
The state vibration shape is constituted, and its experimental principle is as follows：
According to the theory analysis of system mode parameter, for proportional damping system of the one degree of freedom for N, which the
R rank modal coordinates are：
Then in structure, the response of any point l is：
In the case of single excitation, when exciting force acts on p points, then force vector is encouraged to be changed into：
F=[0...0...fp(ω)...0...0] (4)
Modal forces are：
Obtained according to formula (1), formula (3), formula (5)：
Can obtain accordingly measurement point l and excitation point p between frequency response function be：
Formula (7) shows that the response of l points is individually to be caused by the exciting force of p points, i.e. Hlp(ω) implication is to make in p points
With the complex response produced in l points during a unit sinusoidal force.As can be seen here, frequency response function is unrelated with the size of exciting force,
Directly determined by modal parameter.
OrderCan be obtained according to formula (7)：
In formula：--- the r order mode state formation parameters of l measuring points；
--- the r order mode state formation parameters of p measuring points；
Mr--- system r rank mass matrix；
ωr--- the r rank natural frequencies of system；
εr--- r rank damping ratios；
ω --- system frequency.
From formula (8), the system response function tried to achieve by modal test contains all modal parameters of structure
Signal.
Based on above-mentioned operation principle, this utility model embodiment provides the modal idenlification system that a kind of Transformer Winding loosens
System, need to try to achieve during Transformer Winding looseness fault Modal detection respectively axial modal parameter and width to modal parameter, and
Modal parameter when obtaining Transformer Winding looseness fault is analyzed by axial mode parameter and width to modal parameter.
As shown in figure 1, the figure shows the basic structure of the modal idenlification system of Transformer Winding loosening.The system is used for
The Modal detection of Transformer Winding 5, wherein transformator to be measured is the transformer high-voltage winding of a 110kv, connected mode is
YNd11。
Embodiment one：
The system includes signal generator 1, power amplifier 2, axial excitation device 3, multiple acceleration transducers 6, pre- place
Reason device 7 and model analyses device 8, wherein：
The signal that signal generator 1 is produced is the input signal of identifying system, and mainly acts on axial excitation device 3, is driven
Moving axis works to vibrator 3.Mainly for generation of white noise signal, bandwidth is about 20kHz, white noise signal to signal generator 1
Power in each frequency range is identical, it is ensured that the frequency input signal for producing every time is uniform, reduces measurement error, carries
High measurement accuracy.
The signal power that signal generator 1 is produced is relatively low, and 3 driving power of axial excitation device is higher, and signal generator 1 is produced
Raw signal is not enough to driving axial vibrator 3, it is therefore desirable to carry out power amplification to the signal that signal generator 1 is produced, in
It is the input of the outfan electrical connection power amplifier 2 of signal generator 1, white noise signal is transmitted to power amplifier 2,
So that signal power is amplified to be enough to driving axial vibrator 3.
Signal transmission after amplification to axial excitation device 3, driving axial vibrator 3 are worked by power amplifier 2.Axially swash
The device 3 that shakes is located at the top of 5 axial side of Transformer Winding, as shown in Figure 2.The bottom of axial excitation device 3 arranges the first push rod 31, axle
Contacted with Transformer Winding 5 by the first push rod 31 to vibrator 3, transfer a driving force to Transformer Winding 5 so that transformator
There is axial movement in winding 5.Axial excitation device 3 selects Electrodynamic Vibrators, and its operation principle is as follows：Electrodynamic Vibrators are by encouraging
Magnetic coil is constituted with moving winding two parts, and alternating current is passed through coil, is made coil produce vibration in given magnetic field, is given
Magnetic field is produced by magnet exciting coil, and moving winding is electrically excited the effect of power and drives push rod motion, push rod to be connect with Transformer Winding
Touch, so as to transfer a driving force to Transformer Winding 5.
To ensure that Transformer Winding 5 occurs axial movement, axis place straight line and the Transformer Winding 5 of axial excitation device 3
Axis place straight line parallel so that Transformer Winding 5 is encouraged by axial driving force, produce axial deformation.
For the axial deformation of measuring transformer winding 5, multiple acceleration transducers 6, acceleration are set in Transformer Winding 5
Sensor 6 is fixed on metal clip, and metal clip is fixedly secured with Transformer Winding 5, so that acceleration transducer 6
It is fixed in Transformer Winding 5.Preferably, acceleration transducer 6 selects vibration acceleration sensor, for gather transformator around
The axial vibration signal of group 5.
For the axial deformation of accurate measurement Transformer Winding 5,5 points of Transformer Winding is upper, middle and lower, these three
Part is uniformly arranged multiple acceleration transducers 6, the vibration signal of the upper, middle and lower of precise acquisition Transformer Winding 5,
If only gather Transformer Winding 5 upper, middle and lower a portion vibration signal, it is impossible to accurately show transformator around
The axial deformation of group 5, may affect the accuracy for measuring because of extraneous factor.For the precision for further improving signals collecting, root
According to the size of Transformer Winding 5, the quantity of acceleration transducer 6 is more, and the precision for gathering signal is higher.
To gather the vibration force signal of axial excitation device 3, the bottom of the first push rod 31 arranges first pressure sensor 32, the
One pressure transducer 32 and the tip contact of Transformer Winding 5, on the one hand gather the vibration force signal of axial excitation device 3, another
The driving force of axial excitation device 3 is transferred to Transformer Winding 5 by aspect so that Transformer Winding 5 occurs axial movement.
For process signal, acceleration transducer 6 and first pressure sensor 32 are electrically connected the input of preprocessor 7
End, by the vibration force signal simultaneous transmission of the vibration signal of Transformer Winding 5 and axial excitation device 3 to preprocessor 7, pretreatment
Device 7 carries out pretreatment to signal, tries to achieve the frequency response function of each measuring point.In this utility model embodiment, preprocessor 7 is adopted
DHDAS software testing systems, DHDAS software testing systems include signal acquisition module and Frequency Response Analysis module, wherein, signal is adopted
Collection module receives the axle of the vibration signal of the Transformer Winding 5 of the collection of acceleration transducer 6 and the collection of first pressure sensor 32
To the vibration force signal of vibrator 3, Frequency Response Analysis resume module signal obtains the frequency response function of each measuring point, frequency response letter
Number contains all modal informations of 5 axial deformation of Transformer Winding.
To analyze each order mode state of Transformer Winding 5, the input of the outfan electrical connection model analyses device 8 of preprocessor 7
Pretreated data are imported model analyses device 8 by end, and the analysis of model analyses device 8 obtains each of 5 axial deformation of Transformer Winding
Rank natural frequency and the response vibration shape.Model analyses are the signals according to each measuring point in measurement structure, using Modal Parameter Identification
Method obtains the modal parameter (frequency, damping and the vibration shape) of structure.Preferably, model analyses device 8 is soft using DHMA model analyses
Part, obtains the modal parameter of 5 axial deformation of Transformer Winding using ergography.Ergography be to system apply one known to it is defeated
Enter power, measure the response of each structure, using the frequency response function analytical data of software, be calculated each point frequency response letter
Number, using frequency response function, obtains the modal parameter of structure by certain Modal Parameters Identification.
Embodiment two：
The system includes signal generator 1, power amplifier 2, width to vibrator 4, multiple acceleration transducers 6, pre- place
Reason device 7 and model analyses device 8, wherein：
As shown in figure 3, for measuring transformer winding 5 width to deformation, width to vibrator 4 be located at 5 width of Transformer Winding to
The outside of side, width arrange the second push rod 41 to the bottom of vibrator 4, and the bottom of the second push rod 41 arranges second pressure sensor
42, the contacts side surfaces of second pressure sensor 42 and Transformer Winding 5, second pressure sensor 42 are used to gather width to vibrator
4 vibration force signal.There is width to movement, axis place straight line and transformator of the width to vibrator 4 to cause Transformer Winding 5
The axis place straight line of winding 5 is vertical, and Transformer Winding 5 is encouraged to driving force by width, produces width to deformation.
Analysis 5 width of Transformer Winding is shown in embodiment one to the modal parameter specific embodiment of deformation, and here is omitted.
Simulation typical transformer winding looseness fault, the mode that the Transformer Winding that this utility model embodiment is provided loosens
Identifying system obtains Transformer Winding 5 axially respectively and width is to modal parameter during deformation, contrasts 5 normal condition of Transformer Winding
Under corresponding modal parameter, analyze Transformer Winding typical fault when vibration characteristics Changing Pattern.
The modal idenlification system that the Transformer Winding that this utility model embodiment is provided loosens is used for the mould of Transformer Winding 5
State detects that the system includes that signal generator 1, power amplifier 2, axial excitation device 3, width are passed to vibrator 4, multiple acceleration
Sensor 6, preprocessor 7 and model analyses device 8, wherein, the outfan of signal generator 1 electrically connects the input of power amplifier 2
End, the outfan of power amplifier 2 are electrically connected axial excitation device 3 and width to the input of vibrator 4, signal generator 1
White noise signal is produced, is transmitted after the amplification of power amplifier 2 to axial excitation device 3 or width to vibrator 4, driving axial
Vibrator 3 or width work to vibrator 4；The bottom of axial excitation device 3 arranges the first push rod 31, and axial excitation device 3 passes through first
Push rod 31 transfers a driving force to Transformer Winding 5 so that Transformer Winding 5 occurs axial vibration；Bottom of the width to vibrator 4
Second push rod 41 is set, and width transfers a driving force to Transformer Winding 5 by the second push rod 41 to vibrator 4 so that transformator
There is width to vibration in winding 5；Acceleration transducer 6 is uniformly arranged on top, bottom and the bottom of Transformer Winding 5, for adopting
The vibration signal of collection Transformer Winding 5；The bottom of the first push rod 31 arranges first pressure sensor 32, first pressure sensor 32
Contact with Transformer Winding 5, for gathering the vibration force signal of axial excitation device 3；The bottom of the second push rod 41 arranges second and presses
Force transducer 42, second pressure sensor 42 are contacted with Transformer Winding 5, for gathering vibration force signal of the width to vibrator 4；
First pressure sensor 32 and acceleration transducer 6 are electrically connected the input of preprocessor 7, by shaking for axial excitation device 3
The vibration signal simultaneous transmission of power signal and Transformer Winding 5 is to preprocessor 7；Second pressure sensor 42 and acceleration are passed
Sensor 6 is electrically connected the input of preprocessor 7, by width to vibrator 4 vibration force signal and Transformer Winding 5 vibration
Signal simultaneous transmission is to preprocessor 7；Preprocessor 7 carries out pretreatment respectively to signal, tries to achieve the frequency response letter of each measuring point
Number；Pretreated data are imported into model analyses device 8, modal parameter is finally tried to achieve.The identifying system can both improve transformator
The accuracy of detection of 5 slight deformation of winding and sensitivity, while by being contrasted with modal parameter under normal circumstances, analyzing
The Changing Pattern of vibration characteristics when going out Transformer Winding looseness fault.
Those skilled in the art are will readily occur to practical considering description and practice here after the disclosure of utility model
Other new embodiment.The application is intended to any modification of the present utility model, purposes or adaptations, these
Modification, purposes or adaptations follow general principle of the present utility model and including undocumented skill of this utility model
Common knowledge or conventional techniques in art field.Description and embodiments be considered only as it is exemplary, it is of the present utility model
True scope and spirit are pointed out by claim below.
It should be appreciated that this utility model is not limited to the accurate knot for being described above and being shown in the drawings
Structure, and various modifications and changes can be being carried out without departing from the scope.Scope of the present utility model only will by appended right
Ask to limit.
Claims (8)
1. the modal idenlification system that a kind of Transformer Winding loosens, for the Modal detection of Transformer Winding (5), its feature exists
In including signal generator (1), power amplifier (2), axial excitation device (3), width to vibrator (4), multiple acceleration sensings
Device (6), preprocessor (7) and model analyses device (8), wherein：
The outfan of the signal generator (1) electrically connects the input of the power amplifier (2)；
The outfan of the power amplifier (2) is electrically connected the input of the axial excitation device (3) and width to vibrator (4)
End；
The axial excitation device (3) connects the Transformer Winding (5), and the axial excitation device (3) is positioned at the transformator
The top of winding (5) axial direction side；
The width connects the Transformer Winding (5) to vibrator (4), and the width to vibrator (4) positioned at the transformator
Outside of winding (5) width to side；
The axial excitation device (3) and width are electrically connected the input of the preprocessor (7) to the outfan of vibrator (4)
End；
The acceleration transducer (6) is uniformly arranged on the upper, middle and lower of the Transformer Winding (5), and it is described plus
Velocity sensor (6) is electrically connected the input of the preprocessor (7)；
The outfan of the preprocessor (7) electrically connects the input of the model analyses device (8).
2. the modal idenlification system that Transformer Winding according to claim 1 loosens, it is characterised in that the axial excitation
The bottom of device (3) arranges the first push rod (31), and the axial excitation device (3) connects the transformation by first push rod (31)
Device winding (5), and the axis place straight line of the axis place straight line of the axial excitation device (3) and the Transformer Winding (5)
It is parallel.
3. the modal idenlification system that Transformer Winding according to claim 2 loosens, it is characterised in that first push rod
(31) bottom arranges first pressure sensor (32), the first pressure sensor (32) and the Transformer Winding (5)
Tip contact, and the first pressure sensor (42) electrically connects the input of the preprocessor (7).
4. the modal idenlification system that Transformer Winding according to claim 1 loosens, it is characterised in that the width is to exciting
The bottom of device (4) arranges the second push rod (41), and the width connects the transformation by second push rod (41) to vibrator (4)
Device winding (5), and the axis place straight line of axis place straight line of the width to vibrator (4) and the Transformer Winding (5)
Vertically.
5. the modal idenlification system that Transformer Winding according to claim 4 loosens, it is characterised in that second push rod
(41) bottom arranges second pressure sensor (42), the second pressure sensor (42) and the Transformer Winding (5)
Contacts side surfaces, and the second pressure sensor (42) electrically connects the input of the preprocessor (7).
6. the modal idenlification system that Transformer Winding according to claim 1 loosens, it is characterised in that the axial excitation
Device (3) and width include Electrodynamic Vibrators to vibrator (4).
7. the modal idenlification system that Transformer Winding according to claim 1 loosens, it is characterised in that the acceleration is passed
Sensor (6) is including vibration acceleration sensor.
8. the modal idenlification system that Transformer Winding according to claim 1 loosens, it is characterised in that the model analyses
Device (8) includes DHMA model analyses devices.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621143363.1U CN206074213U (en) | 2016-10-21 | 2016-10-21 | The modal idenlification system that a kind of Transformer Winding loosens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621143363.1U CN206074213U (en) | 2016-10-21 | 2016-10-21 | The modal idenlification system that a kind of Transformer Winding loosens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357751A (en) * | 2018-09-26 | 2019-02-19 | 东莞绿邦智能科技有限公司 | A kind of Winding in Power Transformer loosening defect detecting system |
| CN110568081A (en) * | 2019-08-01 | 2019-12-13 | 北京建筑大学 | Ancient building damage testing device and method |
| CN116755001A (en) * | 2023-08-17 | 2023-09-15 | 杭州博洲电器有限公司 | Detection method and equipment for planar transformer |
-
2016
- 2016-10-21 CN CN201621143363.1U patent/CN206074213U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357751A (en) * | 2018-09-26 | 2019-02-19 | 东莞绿邦智能科技有限公司 | A kind of Winding in Power Transformer loosening defect detecting system |
| CN109357751B (en) * | 2018-09-26 | 2020-12-29 | 国网上海市电力公司 | Power transformer winding looseness defect detection system |
| CN110568081A (en) * | 2019-08-01 | 2019-12-13 | 北京建筑大学 | Ancient building damage testing device and method |
| CN110568081B (en) * | 2019-08-01 | 2022-05-31 | 北京建筑大学 | Ancient building damage testing device and method |
| CN116755001A (en) * | 2023-08-17 | 2023-09-15 | 杭州博洲电器有限公司 | Detection method and equipment for planar transformer |
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