CN207408538U - The testing device for insulation defect of for transformer casing - Google Patents
The testing device for insulation defect of for transformer casing Download PDFInfo
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- CN207408538U CN207408538U CN201721431941.6U CN201721431941U CN207408538U CN 207408538 U CN207408538 U CN 207408538U CN 201721431941 U CN201721431941 U CN 201721431941U CN 207408538 U CN207408538 U CN 207408538U
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- 230000007547 defect Effects 0.000 title claims abstract description 121
- 238000009413 insulation Methods 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 title claims abstract description 30
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- 238000009826 distribution Methods 0.000 claims abstract description 35
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- 230000005284 excitation Effects 0.000 abstract description 3
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Abstract
The utility model embodiment provides a kind of testing device for insulation defect of for transformer casing, which includes：Quantum sensor is arranged on the outer surface of bushing shell for transformer；Electron spin resonance spectrometer, electron spin resonance spectrometer include laser generator and microwave transceiver, are used for：Control laser generator to quantum sensor emission laser with excitation quantum sensor；It controls microwave transceiver to quantum sensor emission microwave signal and receives the microwave signal of quantum sensor feedback；The electric field of bushing shell for transformer and/or the distribution characteristics of magnetic field intensity are obtained according to the microwave signal of feedback；Processor, for according to distribution characteristics judge bushing shell for transformer with the presence or absence of defect and in the case of judging bushing shell for transformer existing defects determine defect the defects of type.The testing device for insulation defect is capable of the electric field of bushing shell for transformer, characteristics of geomagnetic field distribution is detected and type the defects of judging the bushing shell for transformer.
Description
Technical field
The present invention relates to bushing shell for transformer, more particularly to a kind of testing device for insulation defect of for transformer casing.
Background technology
Electrical equipment is component important in electric system, and it is power system security that normal table, which is run, reliable
The important foundation of operation.However, it is caused due to raw material, design, manufacturing process, transport, installation etc. in Insulation Problems
Flaw.The defects of hot-spot, even shelf depreciation may be generated if cannot find in time, in operational process or even general
Cause equipment explosion on fire, seriously affect power grid and personal safety.At present, under the electric equipment operations state such as casing, mutual inductor
State-detection means mainly have infrared measurement of temperature, relative medium loss factor measurement.Infrared measurement of temperature can delicately find electric current
Pyrogenicity type defect and whole voltage pyrogenicity type defect, but the major defect of small range concentrated is really difficult to find, and it is this kind of
Defect may exactly quickly grow and cause the generation of pernicious failure；Relative medium loss factor measurement need to equipment end shield into
Row transformation, adds equipment operation risk, and such measurement technology is also difficult to find the major defect of small range concentrated.
The content of the invention
The object of the present invention is to provide a kind of testing device for insulation defect of for transformer casing, insulation defect detections
The defects of device can be detected electric field, the characteristics of geomagnetic field distribution of bushing shell for transformer and judge bushing shell for transformer class
Type.
To achieve these goals, embodiment of the present invention provides a kind of insulation defect detection dress of for transformer casing
It puts, which can include：
Quantum sensor is arranged at the end shield of bushing shell for transformer；
Electron spin resonance spectrometer, electron spin resonance spectrometer can include laser generator and microwave transceiver, be used for：
Control laser generator to quantum sensor emission laser with excitation quantum sensor；
It controls microwave transceiver to quantum sensor emission microwave signal and receives the microwave letter of quantum sensor feedback
Number；
The electric field of bushing shell for transformer and/or the distribution characteristics of magnetic field intensity are generated according to the microwave signal of feedback；
Processor, for judging bushing shell for transformer with the presence or absence of defect according to the distribution characteristics and judging transformer
The defects of defect is determined in the case of casing existing defects type.
Optionally, which can include diamond.
Optionally, which can be by optical fiber to quantum sensor emission laser, which can be with
Emitted by cable and receive microwave.
Optionally, which can also include alarm and display.The processor can be also used for
Start the alarm in the case where definite bushing shell for transformer belongs to major defect.
Optionally, which can be also used for：By the distribution characteristics of the electric field detected and/or magnetic field intensity and in advance
The distributed model of the electric field and/or magnetic field intensity of storage spatially is compared, and judges the transformer set according to comparison result
Pipe whether there is the defects of defect and in case of a defect defect type.
Optionally, which can be the distributed model using neural net model establishing.
Optionally, which can be radial basis function (Radial Basis Function, RBF) neutral net.
Through the above technical solutions, the testing device for insulation defect and method can to the electric field of bushing shell for transformer and/or
Characteristics of geomagnetic field distribution is detected, and passes through the electric field for establishing great amount of samples study and/or distribution characteristics and the inspection of magnetic field intensity
The electric field and/or the distribution characteristics of magnetic field intensity measured is compared, so as to judge that the bushing shell for transformer whether there is defect
And in case of a defect the defects of type.
The other feature and advantage of embodiment of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is that embodiment of the present invention is further understood for providing, and a part for constitution instruction, with
Following specific embodiment is together for explaining embodiment of the present invention, but do not form the limit to embodiment of the present invention
System.In the accompanying drawings：
Fig. 1 is the flow for being used to detect the method for the insulation defect of bushing shell for transformer according to an embodiment of the present invention
Figure；
Fig. 2 is the signal of the testing device for insulation defect of for transformer casing according to an embodiment of the present invention
Figure；
Fig. 3 is the structural frames of the testing device for insulation defect of for transformer casing according to an embodiment of the present invention
Figure；
Fig. 4 is the structural frames of the testing device for insulation defect of for transformer casing according to an embodiment of the present invention
Figure；And
Fig. 5 is the structural frames of the testing device for insulation defect of for transformer casing according to an embodiment of the present invention
Figure.
Reference sign
10th, bushing shell for transformer 20, quantum sensor
30th, electron spin resonance spectrometer 31, laser generator
32nd, microwave transceiver 40, processor
50th, alarm 60, display
Specific embodiment
The specific embodiment of embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be appreciated that
The specific embodiments described herein are merely to illustrate and explain the present invention embodiment, are not intended to limit the invention implementation
Mode.
Fig. 1 is the flow for being used to detect the method for the insulation defect of bushing shell for transformer according to an embodiment of the present invention
Figure.In Fig. 1, this method can include：
In step slo, quantum sensor is set.In this embodiment, can be in transformer set as shown in Figure 2
Quantum sensor is set at the end shield of pipe.Can be the electric field detected according to actual needs for the quantity of the quantum sensor
And/or the precision of magnetic field intensity determines.
In step s 11, laser generator to be arranged on bushing shell for transformer outer surface quantum sensor emit laser with
Excitation quantum sensor.In this embodiment, can be to the amount using the laser generator in electron spin resonance spectrometer
Sub- sensor emission laser is to excite the quantum sensor.
In step s 12, microwave transceiver to quantum sensor emission microwave signal and receives quantum sensor feedback
Microwave signal.In this embodiment, may, for example, be using the microwave transceiver in electron spin resonance spectrometer come to this
Quantum sensor emits microwave signal and receives the microwave signal of quantum sensor feedback.
In step s 13, electron spin resonance spectrometer obtains the electric field of bushing shell for transformer device according to the microwave signal of feedback
And/or the distribution characteristics of magnetic field intensity spatially；In this embodiment, can be passed through using electron spin resonance spectrometer
The microwave frequency of the signal of the feedback determines at this electric field of (installation position of quantum sensor) and/or magnetic field intensity, ties
The installation position of quantum sensor is closed to determine that the distribution of the electric field of the bushing shell for transformer and/or magnetic field intensity spatially is special
Sign.
In step S14, processor judges bushing shell for transformer with the presence or absence of defect according to distribution characteristics and is judging
The defects of defect is determined in the case of bushing shell for transformer existing defects type.It in the present embodiment, can be for example by inspection
The electric field and/or the distribution characteristics of magnetic field intensity measured and the distribution of pre-stored electric field and/or magnetic field intensity spatially
Model is compared, to judge that the bushing shell for transformer whether there is defect under the distribution characteristics of the electric field and/or magnetic field intensity.
In this embodiment, which can be by substantial amounts of
The electric field of bushing shell for transformer sample and/or the distribution characteristics of magnetic field intensity are learnt and are established.It further, can be with
It is that the transformation is judged according to the electric field and/or the distributed model spatially of magnetic field intensity established by great amount of samples study
The specific defect type of device casing.Effective measures so are made to the bushing shell for transformer convenient for staff.In addition it is also possible to
A part, which is chosen, in the electric field and/or the distributed model of magnetic field intensity established by great amount of samples study is used as early warning defect.
In the definite bushing shell for transformer, there are during early warning defect, illustrate that the bushing shell for transformer is likely to go out to ask in a short time at this time
Topic, so makes early warning convenient for staff, avoids the generation of accident in time.In addition, in order to improve operation efficiency, it is above-mentioned with it is logical
The distributed model for crossing electric field that a large amount of sample learnings establish and/or magnetic field intensity can be for example using the distribution of neural net model establishing
Model, further, the neutral net can be RBF (Radial Basis Function, radial basis function) nerve nets
Network.
Fig. 3 is the structural frames of the testing device for insulation defect of for transformer casing according to an embodiment of the present invention
Figure.In figure 3, which can include：
Quantum sensor 20 can be arranged at the end shield of bushing shell for transformer 10.In one example, quantum sensor 20
It can be provided on the outer surface of bushing shell for transformer 10 as shown in Figure 2.The quantity of the quantum sensor 20 may, for example, be 6
It is a, but it is actually detected when quantity can be the electric field and/or magnetic field intensity detected as needed precision come it is definite.
In the embodiment of the present invention, which can include diamond.
Electron spin resonance spectrometer 30, the electron spin resonance spectrometer 30 can include laser generator 31 and microwave receipts
Send out device 32.The laser generator 31 excites the quantum sensor 20 by emitting laser to quantum sensor 20.Preferably, should
Laser generator 31 can emit laser to the quantum sensor 20 by optical fiber, mode in this way can to avoid because
Dust in environment etc. causes the reflection and refraction of laser, so as to improve the light efficiency of laser.The microwave transceiver 32 to
Quantum sensor 20 sends the microwave signal that microwave signal receives the quantum sensor 20 feedback simultaneously.Preferably, can pass through
Cable sends and receives microwave signal to quantum sensor 20, and mode in this way can avoid numerous external interference signals
It influences, so as to improve the accuracy of the testing device for insulation defect.
By measuring the frequency measurement of the microwave signal of feedback received, (quantum passes electron spin resonance spectrometer 30 at this
Sensor 20 set position) electric field and/or magnetic field intensity, and combine the quantum sensor 20 position obtain the transformer set
The electric field of pipe 10 and/or the distribution characteristics of magnetic field intensity.
The processor 40 is connected with electron spin resonance spectrometer 30, for receiving the distribution characteristics.According to the transformer set
The electric field of pipe 10 and/or the distribution characteristics of magnetic field intensity judge that the bushing shell for transformer 10 whether there is defect.Preferably
In, it can be preset in the processor 40 there are many electric field of bushing shell for transformer 10 of existing defects and/or the distribution of magnetic field intensity
Model, by the distribution characteristics of the electric field detected and/or magnetic field intensity and default electric field and/or the distributed model of magnetic field intensity
It is compared, which is judged with the presence or absence of defect according to comparison result and is judging the situation of existing defects
Under, determine whether defect type existing for the bushing shell for transformer 10.
The processor 40 can be general processor, application specific processor, conventional processors, digital signal processor (DSP),
Multi-microprocessor, one or more microprocessors associated with DSP core, controller, microcontroller, application-specific integrated circuit
(ASIC), field programmable gate array (FPGA) circuit, the integrated circuit (IC) of any other type, state machine etc..In the reality
It applies in mode, which can select the quantum analysis detecting system.Although the above-mentioned selection for listing several processors is shown
Example, but the selection example of these processors is not construed as limiting technical scheme, those skilled in the art also may be used
It is also applicable to be interpreted as other processors.
When detecting, the laser generator 31 in electron spin resonance spectrometer 30 emits laser to the quantum sensor 20.
The quantum sensor 20 is arranged at the end shield of the bushing shell for transformer 10, and the quantity of the quantum sensor 20 can be such as 4.
For those skilled in the art it also will be understood that for the needs according to actual estimation precision, the quantity of the quantum sensor 20 can also
It is other values.(in the present embodiment, which can include diamond to the quantum sensor 20.) in laser
Under irradiation, the free electron in nitrogen-room (NV) colour center structure generates polarization.At this point, microwave transceiver 32 is sensed to the quantum
Device 20 emits microwave signal.The quantum sensor 20 is in the electric field of the bushing shell for transformer 10 and/or magnetic field and microwave signal
Cause electron spin resonance under effect.At this point, the quantum sensor 20 reflect it is identical with the frequency of own electronic spin resonance
Feedback microwave signal.Microwave transceiver 32 receive feedback microwave signal and by the microwave signal transmission electron of the feedback from
Revolve resonance spectrometer 30.The electron spin resonance spectrometer 50 calculates the transformer by detecting the frequency of the microwave signal of the feedback
The electric field and/or magnetic field intensity of casing 10.Processor 40 receives electric field and/or magnetic field intensity from electron spin resonance spectrometer 50
Distribution characteristics simultaneously judges the bushing shell for transformer 10 with the presence or absence of scarce according to the electric field and/or the distribution characteristics of magnetic field intensity that detect
It falls into and defect type is determined in the case where judging 10 existing defects of bushing shell for transformer.
Compared with measurement technology of the prior art, the quantum Technology of Precision Measurement which is based on is base
In the manipulation to electronics, the reflected physical features that polarize to the internal electron of testee are very sensitive.Therefore, quantum senses
The measurement accuracy of device 20 can reach electric field 200mV/m (every meter of millivolt), can reach 10 to magnetic field-13(tesla is every by T/m
Rice), so as to obtain the fine distributed model of electric field and/or magnetic field spatially when equipment under test is run.
Fig. 4 is the structure of the testing device for insulation defect of for transformer casing 10 according to an embodiment of the present invention
Block diagram.With the testing device for insulation defect of for transformer casing 10 that is shown in Fig. 3 the difference is that, insulation defect inspection
Device is surveyed to may further include：Alarm 50, the alarm 50 are connected with processor 40, can be used for starting to prompt work
Personnel.The processor 40 can be also used for starting the alarm in the case where the definite bushing shell for transformer 10 belongs to major defect
50.For example, when processor 40 judges 10 existing defects of bushing shell for transformer, so as to determine whether the bushing shell for transformer 10
Defect type, and judge whether the defect type belongs to major defect.In the situation for judging the defect type and belonging to major defect
Under, start the alarm 50 and staff is notified to make corresponding measure, so as to avoid the occurrence of accident.The alarm 50 can be selected
LED light, buzzer, voice device etc., those skilled in the art are it is also assumed that other alarms are also applicable.
Fig. 5 is the testing device for insulation defect of for transformer casing 10 according to an embodiment of the present invention.With Fig. 4
In the testing device for insulation defect of for transformer casing 10 that shows the difference is that, which may be used also
To include：Display 60, the display 60 can be connected with the processor 40, can be used at least showing the bushing shell for transformer 10
The defects of type.For example, when processor 40 detects 10 existing defects of bushing shell for transformer, so as to further detect the transformer
The defects of casing 10 type.At this point, processor 40 by the display 60 prompts the type of the staff defect to allow work
Personnel make measure in advance.When the processor 40 judges that the defect type belongs to major defect, which can be with a side
By display 60 staff is prompted to take measures in time in face；On the other hand work people can also be prompted by alarm 50
Member.The generation to cause the accident because of the carelessness of staff is so avoided by alarm twice.The display 60 can select
With LED, OLED display screen etc., those skilled in the art are it is also assumed that other displays are also applicable.
In an embodiment of the invention, the insulation defect inspection based on for transformer casing 10 as shown in Figure 5
Device is surveyed, which can be configured to：By the distribution characteristics of the electric field detected and/or magnetic field intensity with depositing in advance
The distributed model of the electric field and/or magnetic field intensity of storage spatially is compared, according to comparison result judge the electric field and/
Or the bushing shell for transformer 10 under the distribution characteristics of magnetic field intensity whether there is defect.In the case where comparing out existing defects, into
One step by the distribution characteristics of the electric field detected and/or magnetic field intensity and pre-stored electric field and/or magnetic field spatially
Distributed model is compared, type the defects of so as to identify the defect.
In an embodiment of the invention, based on the insulation to for transformer casing 10 as shown in Figure 5
Defect detecting device, the distributed model can be using neural net model establishing, and further, which can be RBF
Neutral net.Can be known to those skilled in the art, this paper to the method that distributed model is modeled using neutral net
No longer illustrate its details.
As shown in Figure 1 be used for is performed with the testing device for insulation defect of for transformer casing 10 as shown in Figure 5
The testing device for insulation defect of bushing shell for transformer 10.During the work time, quantum sensor 10 can be arranged on bushing shell for transformer
At 10 end shields.The quantity of the quantum sensor 20 can be such as 6.Those skilled in the art are it also will be understood that for according to reality
Estimation precision needs, the quantity of the quantum sensor 20 can also be other values, and the quantum sensor 20 is (in this embodiment party
In formula, which can include diamond.) under the irradiation of laser, the electronics in nitrogen-room (NV) colour center structure
It polarizes.Electron spin resonance spectrometer 30 controls microwave transceiver 32 to emit microwave signal to the quantum sensor 20.The amount
Sub- sensor 20 causes electron spin resonance under the action of the electric field of the bushing shell for transformer 10 and/or magnetic field and microwave signal
And reflect the microwave signal identical with the frequency of the resonant frequency.The microwave signal of the reception feedback of microwave transceiver 32 is simultaneously anti-by this
The microwave signal transmission electron spin resonance spectrometer 50 of feedback.The electron spin resonance spectrometer 50 is by detecting the microwave of the feedback
The frequency of signal calculates the electric field of the bushing shell for transformer 10 and/or magnetic field intensity and by the setting of each quantum sensor 20
Position determines the distribution characteristics of the electric field and/or magnetic field intensity.In processor 40 by RBF neural foundation be preset with it is more
The distributed model of the electric field and/or magnetic field intensity of bushing shell for transformer 10 spatially under kind defect situation state.The processor 40
By the distribution characteristics of the electric field and/or magnetic field intensity of the real transformer casing 10 received spatially and default electric field
And/or the distributed model of magnetic field intensity spatially is compared, and judges whether the bushing shell for transformer 10 is deposited according to comparison result
In defect.If 10 existing defects of bushing shell for transformer, then, processor 40 is then by locating to start the notice work people of alarm 50
Member.In addition, the processor 40 can also further by detect bushing shell for transformer 10 electric field and/or magnetic field intensity spatially
Distributed model of the distribution characteristics with default electric field and/or magnetic field intensity spatially be compared, so as to judge that this is lacked
Sunken type.Processor 40 shows 10 existing defects of bushing shell for transformer by display 60 and shows corresponding defect type.
Staff can also select in electric field and/or the magnetic field intensity distributed model spatially of default number of drawbacks in advance
One or more are used as major defect, then if the defect belongs to major defect, then processor 40 is carried by display 60
Showing the staff bushing shell for transformer 10, there are major defects.Meanwhile the processor 40 can also start alarm 80 and notify work
Personnel, so as to the generation for avoiding the carelessness because of staff and causing the accident.
Further, the characteristics of staff can also occur according to major defect, in the electricity of default number of drawbacks
Early warning defect is set in the distributed model of field and/or magnetic field intensity spatially, the appearance of the defect indicates the transformer set
Pipe 10 is likely to will appear from major defect.Therefore, lacked for early warning when processor 40 compares out bushing shell for transformer 10 the defects of
When falling into, can also early warning be made to staff by display 60, so as to avoid the generation of accident in advance.
Through the above technical solutions, the testing device for insulation defect and method of for transformer casing 10 proposed by the present invention
It has the following advantages：
1st, bushing shell for transformer 10 is measured using the quantum sensor based on quantum Technology of Precision Measurement.By that will lead to
Cross the distributed model of the electric field and/or magnetic field intensity of a large amount of sample learnings foundation spatially and the bushing shell for transformer 10 detected
Electric field and/or the distribution characteristics spatially gone of magnetic field intensity be compared, solving in the prior art can only be to transformer
The problem of 10 integrality of casing measures realizes the detection to the local small range defect of bushing shell for transformer 10.
2nd, by setting early warning defect and major defect, when detecting early warning defect, staff can be prompted to shift to an earlier date
Preparation is made, avoids the generation of accident.When detecting major defect, staff can be prompted in time, avoid getting over
Therefore further deterioration.
It 3rd, also can be to the specific of 10 defect of bushing shell for transformer by the local small-scale detection of bushing shell for transformer 10
Position is positioned, convenient for the repair of bushing shell for transformer 10.
The optional embodiment of example of the present invention is described in detail above in association with attached drawing, still, embodiment of the present invention is not
The detail being limited in the above embodiment, can be to of the invention real in the range of the technology design of embodiment of the present invention
The technical solution for applying mode carries out a variety of simple variants, these simple variants belong to the protection domain of embodiment of the present invention.
It is further to note that the specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, embodiment of the present invention
Various combinations of possible ways are no longer separately illustrated.
In addition, can also be combined between a variety of embodiments of embodiment of the present invention, as long as its
Without prejudice to the thought of embodiment of the present invention, it should equally be considered as embodiment of the present invention disclosure of that.
Claims (7)
- A kind of 1. testing device for insulation defect of for transformer casing, which is characterized in that the testing device for insulation defect bag It includes：Quantum sensor (20), is arranged at the end shield of the bushing shell for transformer (10)；Electron spin resonance spectrometer (30), the electron spin resonance spectrometer (30) include laser generator (31) and microwave transmitting and receiving Device (32), is used for：The laser generator (31) is controlled to emit laser to the quantum sensor (20) to excite the quantum sensor (20)；The microwave transceiver (32) is controlled to emit microwave signal to the quantum sensor (20) and receives the quantum and is sensed The microwave signal of device (20) feedback；The electric field of the bushing shell for transformer (10) and/or the distribution spy of magnetic field intensity are obtained according to the microwave signal of the feedback Sign；AndProcessor (40), for judging the bushing shell for transformer (10) with the presence or absence of defect according to the distribution characteristics and sentencing Break the defects of to determine in the case of the bushing shell for transformer (10) existing defects defect type.
- 2. testing device for insulation defect according to claim 1, which is characterized in that the quantum sensor (20) includes gold Hard rock.
- 3. testing device for insulation defect according to claim 1, which is characterized in that the laser generator (31) passes through light Fibre emits laser to the quantum sensor (20), and the microwave transceiver (32) is emitted by cable and receives microwave signal.
- 4. testing device for insulation defect according to claim 1, which is characterized in that the testing device for insulation defect is into one Step includes：Alarm (50) and display (60)；The processor (40) is additionally operable to：Start the alarm (50) in the case where the definite bushing shell for transformer (10) belongs to major defect.
- 5. testing device for insulation defect according to claim 1, which is characterized in that the processor (40) is used for：The distribution characteristics of the electric field detected and/or magnetic field intensity and pre-stored electric field and/or magnetic field intensity are existed Distributed model spatially is compared, according to comparison result judge the bushing shell for transformer (10) with the presence or absence of defect and The type the defects of defect in the case of existing defects.
- 6. testing device for insulation defect according to claim 5, which is characterized in that the distributed model is to use nerve net The distributed model of network modeling.
- 7. testing device for insulation defect according to claim 6, which is characterized in that the neutral net is radial basis function Neutral net.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721431941.6U CN207408538U (en) | 2017-10-31 | 2017-10-31 | The testing device for insulation defect of for transformer casing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721431941.6U CN207408538U (en) | 2017-10-31 | 2017-10-31 | The testing device for insulation defect of for transformer casing |
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| CN207408538U true CN207408538U (en) | 2018-05-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728027A (en) * | 2017-10-31 | 2018-02-23 | 国网安徽省电力公司电力科学研究院 | Testing device for insulation defect and method for bushing shell for transformer |
-
2017
- 2017-10-31 CN CN201721431941.6U patent/CN207408538U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728027A (en) * | 2017-10-31 | 2018-02-23 | 国网安徽省电力公司电力科学研究院 | Testing device for insulation defect and method for bushing shell for transformer |
| CN107728027B (en) * | 2017-10-31 | 2023-05-16 | 国网安徽省电力公司电力科学研究院 | Insulation defect detection device and method for transformer bushing |
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