CN108801892A - Grounding net of transformer substation corrosion diagnosis method and system - Google Patents
Grounding net of transformer substation corrosion diagnosis method and system Download PDFInfo
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- CN108801892A CN108801892A CN201810630092.XA CN201810630092A CN108801892A CN 108801892 A CN108801892 A CN 108801892A CN 201810630092 A CN201810630092 A CN 201810630092A CN 108801892 A CN108801892 A CN 108801892A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
A kind of grounding net of transformer substation corrosion diagnosis method, including：Driving source injects the programmable exciting current of transmission power to tested grounded screen；The electromagnetic field that induction coil inductive grounding net is generated by exciting current, and the electromagnetic field signal that induction obtains is sent to receiver；Receiver controls driving source according to the amplitude of electromagnetic field signal, makes the electromagnetic field signal that receiver exports within a predetermined range；Whether the preset range is saturated according to the signal condition channel of receiver and is formulated；Frequency optimum traffic is calculated according to ambient noise frequency characteristic in receiver；And driving source is controlled to the corresponding exciting current of tested grounded screen injection frequency optimum traffic according to frequency optimum traffic；The corrosion condition for being tested grounded screen is diagnosed according to the imaginary part of the electromagnetic field signal of receiver output.It can effectively reduce Error Diagnostics, improve diagnostic accuracy.
Description
Technical field
The present invention relates to power network signal processing technology fields, more specifically to grounding net of transformer substation corrosion diagnosis side
Method and system.
Background technology
Include various heavy current installations and weak current equipment in substation's measuring environment, electromagnetic environment is extremely complex.Substation connects
There are strong power frequency electromagnetic fields in space near earth mat.When switching manipulation or the system failure occurs, space has strong transient state electricity
Magnetic field generates.Strong power frequency generates interference with strong transient electromagnetic field to the equipment in substation.The grounded screen applied in substation
Corrosion diagnosis device, collected signal is very faint, if not to interference inhibited, can because do not acquire small-signal or
By interference signal as useful signal so that mistake occurs for measurement result, can not detect ground net corrosion point position or erroneous judgement
Hot spot position causes to seriously affect to the diagnosis of ground net corrosion.
Currently, corrosion diagnosis of grounding grid device is connect using alien frequencies excitation, the principle of electromagnetic induction using induction coil detection
The electromagnetic field that earth mat incudes under exciting current effect in earth's surface, by the distribution of electromagnetic field intensity come positioning both ground net topology knot
Structure and hot spot position.However, in the environment of substation's strong jamming, sensor coil is incuded by other electromagnetic waves, useful
Signal is flooded by background interference, even if increasing trapper and filter in signal sampling channel, effect is not still notable.And
And with the increasing of ground connection web area, the electric current in grounding grids substantially reduces, and the inductive signal of earth's surface is fainter.Base
In above 2 reasons, when carrying out practical measure, the distribution of the electromagnetic field intensity detected is often rambling so that
Detection failure.
Therefore, it is necessary to consider to carry out under substation's strong jamming complex background the accuracy of corrosion diagnosis of grounding grid with it is reliable
Property, find the effective ways for improving device signal-to-noise ratio.
Invention content
The technical problem to be solved in the present invention is, in view of the deficiencies of the prior art, provides grounding net of transformer substation corrosion and examines
Disconnected method and system, can effectively reduce Error Diagnostics, improve diagnostic accuracy.
On the one hand, grounding net of transformer substation corrosion diagnosis method provided by the invention, includes the following steps：
Driving source injects the programmable exciting current of transmission power to tested grounded screen；
The electromagnetic field that induction coil inductive grounding net is generated by exciting current, and the electromagnetic field signal that induction is obtained transmits
To receiver；
Receiver controls driving source according to the amplitude of electromagnetic field signal, makes the electromagnetic field signal that receiver exports in predetermined model
In enclosing；Whether the preset range is saturated according to the signal condition channel of receiver and is formulated；
Frequency optimum traffic is calculated according to ambient noise frequency characteristic in receiver；And it is controlled according to frequency optimum traffic
Driving source injects the corresponding exciting current of frequency optimum traffic to tested grounded screen；
The corrosion condition for being tested grounded screen is diagnosed according to the imaginary part of the electromagnetic field signal of receiver output.
On the other hand, grounding net of transformer substation corrosion diagnosis system provided by the invention, which is characterized in that including：Driving source,
Receiver, induction coil and diagnosis unit；
The induction coil is connected with receiver, and driving source is wirelessly connected with receiver；Driving source and tested grounded screen phase
Even；The diagnosis unit connects receiver；
The driving source, for injecting the programmable exciting current of transmission power to tested grounded screen；
The induction coil for the electromagnetic field that inductive grounding net is generated by exciting current, and will incude obtained electromagnetism
Field signal is sent to receiver；
The receiver, for controlling driving source according to the amplitude of electromagnetic field signal, the electromagnetic field letter for making receiver export
Number within a predetermined range；Whether the preset range is saturated according to the signal condition channel of receiver and is formulated；And according to the back of the body
Frequency optimum traffic is calculated in scape noise frequency characteristic；And driving source is controlled according to frequency optimum traffic and is noted to tested grounded screen
Enter the corresponding exciting current of frequency optimum traffic；
The diagnosis unit, the corrosion feelings of the imaginary part of the electromagnetic field signal for export according to receiver to tested grounded screen
Condition is diagnosed.
Compared with prior art, the invention has the advantages that：
1, the present invention uses " gain two close cycles automatically control ", the transmission power in current excitation source and data acquisition channel
Amplification factor, attenuation multiple are that program is programmable, maximum in this way under the premise of ensureing that Measurement channel saturation distortion does not occur
The possible amplitude for improving signal.
2, the present invention uses " Frequency servo ", and the frequency of excitation waveform and the frequency-selecting frequency of receiver are programmable,
It realizes the frequency range that avoids interference in complicated substation's electromagnetic environment, inhibits noise to the greatest extent.
3, the present invention uses imaginary component probe method, the imaginary component of design lock-in amplifier extraction sensor sensing signal, profit
The characteristics of being concentrated mainly on imaginary component with corrosion conductor inductive signal, it is detached with background signal, to improve grounded screen corruption
Lose the accuracy of fault-finding.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the method flow diagram in the embodiment of the present invention；
Fig. 2 is the system structure diagram in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram in double-closed-loop control circuit in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of frequency control-loop in the embodiment of the present invention.
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
The specific implementation mode of the present invention.
As shown in Figure 1, grounding net of transformer substation corrosion diagnosis method of the present invention, includes the following steps：
101, driving source injects the programmable exciting current of transmission power to tested grounded screen；
102, the electromagnetic field that induction coil inductive grounding net is generated by exciting current, and the electromagnetic field signal that induction is obtained
It is sent to receiver；
103, receiver controls driving source according to the amplitude of electromagnetic field signal, makes the electromagnetic field signal that receiver exports pre-
Determine in range；Whether the preset range is saturated according to the signal condition channel of receiver and is formulated；
104, frequency optimum traffic is calculated according to ambient noise frequency characteristic in receiver；And according to frequency optimum traffic
Driving source is controlled to the corresponding exciting current of tested grounded screen injection frequency optimum traffic；
105, the corrosion condition for being tested grounded screen is diagnosed according to the imaginary part of the electromagnetic field signal of receiver output.
Step 103, it specifically includes：
Programmable amplifier is sent to programmable filter after amplifying the amplified electromagnetic field signal of frequency-selective amplifier again；
First AD converter feeds back to one step gain controller after converting the output signal of programmable filter；
Whether the output signal that one step gain controller calculates programmable filter by control algolithm makes signal condition channel
Saturation：If so, control programmable amplifier reduces amplification factor；If it is not, then controlling programmable amplifier increases amplification factor.
As shown in Figures 2 and 3, in receivers, the first programmable amplifier, programmable filter, the first AD converter and and
One step gain controller constitutes the first close loop control circuit.
Step 103, further include：
The output signal that lock-in amplifier receives programmable filter is handled, and the electromagnetic field letter of receiver output is obtained
Number；
Second AD converter feeds back to two level gain controller after converting the electromagnetic field signal that receiver exports；
Whether the electromagnetic field signal that two level gain controller calculates receiver output meets linearly turning for the second AD converter
Change range：If so, control driving source reduces the amplitude that injection is tested the exciting current of grounded screen；If it is not, then controlling driving source
Increase the amplitude that injection is tested the exciting current of grounded screen.
As shown in Figures 2 and 3, in receiver and driving source, signal condition channel, the second AD converter, two level gain control
Device, driving source controller, the second programmable amplifier and power amplifier processed constitute the second close loop control circuit.
Step 104, it specifically includes：
Frequency controller obtains background noise spectrum characteristic；
Frequency optimum traffic is calculated according to background noise spectrum characteristic in frequency controller；
Frequency controller sends to driving source according to frequency optimum traffic and instructs, and driving source is made to be injected most to tested grounded screen
The corresponding exciting current of good working frequency.
Step 104, further include：
Frequency controller controls frequency-selective amplifier and programmable filter respectively according to frequency optimum traffic, makes corresponding passband
Frequency and cutoff frequency are corresponding with frequency optimum traffic.
As shown in Figures 2 and 4, in receiver and driving source, signal condition channel, frequency controller, driving source controller,
Programmable waveform generator and power amplifier constitute frequency control-loop.
As shown in Fig. 2, grounding net of transformer substation corrosion diagnosis system, including：Driving source, receiver, induction coil and diagnosis
Unit；
The induction coil is connected with receiver, and driving source is wirelessly connected with receiver；Driving source and tested grounded screen phase
Even；The diagnosis unit connects receiver；
The driving source, for injecting the programmable exciting current of transmission power to tested grounded screen；
The induction coil for the electromagnetic field that inductive grounding net is generated by exciting current, and will incude obtained electromagnetism
Field signal is sent to receiver；
The receiver, for controlling driving source according to the amplitude of electromagnetic field signal, the electromagnetic field letter for making receiver export
Number within a predetermined range；Whether the preset range is saturated according to the signal condition channel of receiver and is formulated；And according to the back of the body
Frequency optimum traffic is calculated in scape noise frequency characteristic；And driving source is controlled according to frequency optimum traffic and is noted to tested grounded screen
Enter the corresponding exciting current of frequency optimum traffic；
The diagnosis unit, the corrosion feelings of the imaginary part of the electromagnetic field signal for export according to receiver to tested grounded screen
Condition is diagnosed.
Further, the receiver includes：Signal condition channel, receiver controller, converter and the first channel radio
Believe module；
The signal condition channel includes：Frequency-selective amplifier, the first programmable amplifier, programmable filter and locking phase amplification
Device；
The converter includes：First AD converter and the second AD converter；
The receiver controller includes：Frequency controller and gain controller and two level gain controller；
The input terminal of the frequency-selective amplifier is connected with induction coil, and output end is sequentially connected the first programmable amplifier, journey
Control filter and lock-in amplifier；
The output end of the lock-in amplifier connects diagnosis unit；
The input terminal of first AD converter is connected with the output end of programmable filter, and output end is controlled with one step gain
The input terminal of device is connected；The output end of the one step gain controller connects the first programmable amplifier.
Further, the driving source includes：Power amplifier, the second programmable amplifier, programmable waveform generator,
Driving source controller and the second wireless communication module；
The output end of the power amplifier is connected with tested grounded screen；Second wireless communication module and first is wirelessly
Communication module is wirelessly connected；
Second wireless communication module is also connected with driving source controller；
The output end of the driving source controller be sequentially connected programmable waveform generator, the second programmable amplifier into and work(
Rate amplifier；
The output end of the lock-in amplifier is also connected with the input terminal of the second AD converter；
The output end of second AD converter is connected with the input terminal of two level gain controller；
The two level gain controller is connected with the first wireless communication module.
Still further, the output end of the frequency controller is sequentially connected driving source controller, may be programmed waveform
Device and power amplifier.
Also further, the output end of the frequency controller is also respectively connected with frequency-selective amplifier and programmable filter.
In the present invention, it is designed in " double-closed-loop control circuit " so that the transmission power and data in current excitation source acquire
Amplification factor, the attenuation multiple in channel are that program is programmable, do not occur the premise of saturation distortion in guarantee Measurement channel in this way
Under, the amplitude of the raising signal of maximum possible.
It is designed with " frequency closed loop " so that the frequency of excitation waveform and the frequency-selecting frequency of receiver are programmable, real
Avoid interference in complicated substation's electromagnetic environment frequency range now, inhibits noise to the greatest extent.
Using imaginary component probe method, the imaginary component of design lock-in amplifier extraction sensor sensing signal is led using corrosion
The characteristics of body-sensing induction signal is concentrated mainly on imaginary component detaches it with background signal, is visited to improve ground net corrosion failure
The accuracy of survey.
With reference to example detailed description of the present invention technical solution：
As shown in Fig. 2 to 3, first, is injected and sent out between two down conductors of selected grounded screen by driving source
Penetrate the exciting current of power programmable；
Receiver controller sends to programmable amplifier and instructs, and can control the gain of data acquisition channel, constitutes first
Close loop control circuit；
If signal condition channel is saturated, (the first wireless communication module and second is wirelessly for module by radio communication for receiver
Communication module) it is instructed to the transmission of driving source controller, so that its is reduced transmission power；
Driving source controller sends to programmable amplifier and instructs, and can control transmitting output power, constitutes the second closed loop
The double-closed-loop control of entire diagnostic device gain is achieved in control loop.
The signal condition channel of system, by frequency-selective amplifier, the first programmable amplifier, programmable filter and lock-in amplifier
Level Four is constituted, and first circuit is by programmable amplifier, the first AD converter and receiver controller in double-closed-loop control circuit
One step gain controller composition.
The course of work can be：(1) gain control unit sends to programmable amplifier and instructs, its amplification factor is made to reach most
Greatly；(2) first AD converters acquire the signal in signal condition channel, and the value of acquisition is transferred to the level-one in receiver controller
Gain control unit；(3) amplification is calculated by collected signal amplitude by control algolithm in one step gain control unit
Whether need to reduce amplification factor under multiple, and result establishment control instruction is sent to programmable amplifier, repeats (1), (2) (3)
Step, until collected signal amplitude meets the input range requirement of lock-in amplifier.
In this way, signal condition channel will obtain maximum signal amplification factor.Second circuit in double-closed-loop control circuit
By two level gain control unit, driving source controller, the programmable amplifier in signal condition channel, AD converter II, receiver
It is constituted with power amplifier, the course of work is：(1) receiver controller sends to driving source controller and instructs, and makes its control
The amplification factor of programmable amplifier reaches maximum, and driving source sends exciting current with maximum power at this time；(2) signal condition channel
After determining amplification factor, the amplified signal of locking phase is input to receiver controller through the second AD converter；(3) two stage gains
Whether controller is calculated under the exciting current amplitude by collected signal amplitude by algorithm and needs to reduce exciting current
Amplitude；(4) three above step is repeated, until collected signal amplitude meets the linear transformation model of the second AD converter
It encloses.
Secondly, frequency-selecting frequency in receiver can be by controller to frequency-selecting amplification module, programmable filter module
Instruction is sent, switching channel passes through frequency；
In addition, module sends instruction to receiver to driving source controller by radio communication, it is made to control in driving source
Programmable filter generator, obtains the waveform of required frequency, and frequency control-loop is constituted with this, in substation's electricity complicated and changeable
In magnetic environment, switch operating frequency, avoid interference frequency range.
Frequency loop by signal condition channel frequency-selective amplifier and the first programmable filter, frequency controller, excitation
Source controller, programmable waveform generator and power amplifier are constituted.
The course of work can be：(1) receiver controller obtains the spectral characteristic of ambient noise, and best work is obtained by algorithm
Working frequency；(2) frequency controller is compiled into control instruction by the frequency optimum traffic being calculated, and controls in signal condition channel
Frequency-selective amplifier and programmable filter, it is required frequency optimum traffic to make its band connection frequency and cutoff frequency respectively；(3) it connects
It receives machine controller and sends instruction to driving source controller, its is made to control programmable waveform generator, generate under frequency optimum traffic
Sine wave, which generates exciting current after power amplification.
Again, the signal in receiver signal conditioning channel is after the processing such as amplification, filtering, trap, with 0 ° and 90 ° of ginseng
Signal is examined through lock-in amplifier AD630 processing, obtains the real and imaginary parts of inductive signal.Wherein reference signal is controlled by receiver
Device I/O port provides, and imaginary signals are the response for reflecting corrosion conductor to pumping signal.
Finally, the imaginary signals distributed in three dimensions figure arrived according to obtained different grounded screen location sensitives is to substation grounding
The corrosion condition of net is diagnosed.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited in above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (10)
1. a kind of grounding net of transformer substation corrosion diagnosis method, which is characterized in that include the following steps：
Driving source injects the programmable exciting current of transmission power to tested grounded screen；
The electromagnetic field that induction coil inductive grounding net is generated by exciting current, and the electromagnetic field signal that induction obtains is sent to and is connect
Receipts machine；
Receiver controls driving source according to the amplitude of electromagnetic field signal, makes the electromagnetic field signal that receiver exports in preset range
It is interior；Whether the preset range is saturated according to the signal condition channel of receiver and is formulated；
Frequency optimum traffic is calculated according to ambient noise frequency characteristic in receiver；And it is controlled and is encouraged according to frequency optimum traffic
The corresponding exciting current of frequency optimum traffic is injected in source to tested grounded screen；
The corrosion condition for being tested grounded screen is diagnosed according to the imaginary part of the electromagnetic field signal of receiver output.
2. grounding net of transformer substation corrosion diagnosis method according to claim 1, which is characterized in that the receiver is according to electricity
The amplitude of magnetic field signal controls driving source, makes the electromagnetic field signal that receiver exports within a predetermined range, specifically includes：
Programmable amplifier is sent to programmable filter after amplifying the amplified electromagnetic field signal of frequency-selective amplifier again；
First AD converter feeds back to one step gain controller after converting the output signal of programmable filter；
Whether the output signal that one step gain controller calculates programmable filter by control algolithm makes signal condition channel be saturated：
If so, control programmable amplifier reduces amplification factor；If it is not, then controlling programmable amplifier increases amplification factor.
3. grounding net of transformer substation corrosion diagnosis method according to claim 2, which is characterized in that the receiver is according to electricity
The amplitude of magnetic field signal controls driving source, makes the electromagnetic field signal that receiver exports within a predetermined range, further includes：
The output signal that lock-in amplifier receives programmable filter is handled, and the electromagnetic field signal of receiver output is obtained；
Second AD converter feeds back to two level gain controller after converting the electromagnetic field signal that receiver exports；
Two level gain controller calculates the linear transformation the model whether electromagnetic field signal that receiver exports meets the second AD converter
It encloses：If so, control driving source reduces the amplitude that injection is tested the exciting current of grounded screen；If it is not, then controlling driving source increase
Injection is tested the amplitude of the exciting current of grounded screen.
4. grounding net of transformer substation corrosion diagnosis method according to claim 1, which is characterized in that the receiver is according to the back of the body
Frequency optimum traffic is calculated in scape noise frequency characteristic；And driving source is controlled according to frequency optimum traffic and is noted to tested grounded screen
Enter the corresponding exciting current of frequency optimum traffic, specifically includes：
Frequency controller obtains background noise spectrum characteristic；
Frequency optimum traffic is calculated according to background noise spectrum characteristic in frequency controller；
Frequency controller sends to driving source according to frequency optimum traffic and instructs, and driving source is made to inject best work to tested grounded screen
The corresponding exciting current of working frequency.
5. grounding net of transformer substation corrosion diagnosis method according to claim 4, which is characterized in that the receiver is according to the back of the body
Frequency optimum traffic is calculated in scape noise frequency characteristic；And driving source is controlled according to frequency optimum traffic and is noted to tested grounded screen
Enter the corresponding exciting current of frequency optimum traffic, further includes：
Frequency controller controls frequency-selective amplifier and programmable filter respectively according to frequency optimum traffic, makes corresponding band connection frequency
It is corresponding with frequency optimum traffic with cutoff frequency.
6. a kind of grounding net of transformer substation corrosion diagnosis system, which is characterized in that including：It driving source, receiver, induction coil and examines
Disconnected unit；
The induction coil is connected with receiver, and driving source is wirelessly connected with receiver；Driving source is connected with tested grounded screen；Institute
State diagnosis unit connection receiver；
The driving source, for injecting the programmable exciting current of transmission power to tested grounded screen；
The induction coil, for the electromagnetic field that inductive grounding net is generated by exciting current, and the electromagnetic field that induction is obtained is believed
Number it is sent to receiver；
The receiver makes the electromagnetic field signal that receiver exports exist for controlling driving source according to the amplitude of electromagnetic field signal
In preset range；Whether the preset range is saturated according to the signal condition channel of receiver and is formulated；And it is made an uproar according to background
Frequency optimum traffic is calculated in acoustic frequency characteristic；And driving source is controlled according to frequency optimum traffic and is injected most to tested grounded screen
The corresponding exciting current of good working frequency；
The diagnosis unit, the imaginary part of the electromagnetic field signal for export according to receiver to the corrosion condition of tested grounded screen into
Row diagnosis.
7. grounding net of transformer substation corrosion diagnosis system according to claim 6, which is characterized in that the receiver includes：
Signal condition channel, receiver controller, converter and the first wireless communication module；
The signal condition channel includes：Frequency-selective amplifier, the first programmable amplifier, programmable filter and lock-in amplifier；
The converter includes：First AD converter and the second AD converter；
The receiver controller includes：Frequency controller and gain controller and two level gain controller；
The input terminal of the frequency-selective amplifier is connected with induction coil, and output end is sequentially connected the first programmable amplifier, program-controlled filter
Wave device and lock-in amplifier；
The output end of the lock-in amplifier connects diagnosis unit；
The input terminal of first AD converter is connected with the output end of programmable filter, output end and one step gain controller
Input terminal is connected；The output end of the one step gain controller connects the first programmable amplifier.
8. grounding net of transformer substation corrosion diagnosis system according to claim 7, which is characterized in that the driving source includes：
Power amplifier, the second programmable amplifier, programmable waveform generator, driving source controller and the second wireless communication module；
The output end of the power amplifier is connected with tested grounded screen；Second wireless communication module and the first wireless communication
Module is wirelessly connected；
Second wireless communication module is also connected with driving source controller；
The output end of the driving source controller is sequentially connected programmable waveform generator, the second programmable amplifier is put into power
Big device；
The output end of the lock-in amplifier is also connected with the input terminal of the second AD converter；
The output end of second AD converter is connected with the input terminal of two level gain controller；
The two level gain controller is connected with the first wireless communication module.
9. grounding net of transformer substation corrosion diagnosis system according to claim 8, which is characterized in that
The output end of the frequency controller is sequentially connected driving source controller, programmable waveform generator and power amplifier.
10. grounding net of transformer substation corrosion diagnosis system according to claim 9, which is characterized in that
The output end of the frequency controller is also respectively connected with frequency-selective amplifier and programmable filter.
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| CN201810630092.XA CN108801892B (en) | 2018-06-19 | 2018-06-19 | Transformer substation grounding grid corrosion diagnosis method and system |
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| CN201810630092.XA CN108801892B (en) | 2018-06-19 | 2018-06-19 | Transformer substation grounding grid corrosion diagnosis method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111044436A (en) * | 2019-11-12 | 2020-04-21 | 国网陕西省电力公司电力科学研究院 | Magnetic field continuation technology applied to corrosion state diagnosis of transformer substation grounding grid |
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