CN207473034U - A kind of grounding net defect diagnostic device - Google Patents
A kind of grounding net defect diagnostic device Download PDFInfo
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- CN207473034U CN207473034U CN201721642193.6U CN201721642193U CN207473034U CN 207473034 U CN207473034 U CN 207473034U CN 201721642193 U CN201721642193 U CN 201721642193U CN 207473034 U CN207473034 U CN 207473034U
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Abstract
The utility model is related to a kind of grounding net defect diagnostic devices, and including driving source system and signal detection system, the driving source system includes power supply, function signal generator, power amplification circuit, impedance transformer and power frequency display unit；Wherein, function signal generator includes controlling to adjust circuit, signal generating circuit and amplification output stage; power amplification circuit includes input stage, pushes grade, output stage and protected level; protected level is respectively with pushing grade and output stage to connect; impedance transformer includes primary coil, secondary coil and iron core; iron core of the iron core for the nanocrystalline material of annular, primary coil and secondary coil are wrapped on iron core.The utility model can effectively inhibit the electromagnetic interference at scene, push main interference frequency point aside, measurement accuracy and resolution ratio is made to disclosure satisfy that defect diagonsis requirement.
Description
Technical field
The utility model is related to grounded screen detection technique field, in particular to a kind of grounding net defect diagnostic device.
Background technology
Electric power pylon grounded screen plays a very important role in the safe operation of power Transmission, and ground connection performance is direct
It is related to the normal operation of transmission line of electricity, the grounded screen in China is made mostly of steel material, more with the growth of service life
The corrosion or fracture of grounding grids easily occur for rain and coastal area, influence the ground connection performance of grounded screen.Earthing or grounding means is generally
Latticed grounding body is usually welded to form grid using band steel, round steel, angle steel, steel pipe or copper material etc., and the grid is usually
The depth of 0.6~1 meter of underground is embedded in, to realize pressure, diffusing and the effect for reducing ground resistance, as needed different
There is earth conductor to be connected with the electrical equipment on ground at grid position.When short circuit occurs for transmission line of electricity or the failures such as be struck by lightning
When, the grounded net of high current of moment is dispensed into ground, and ground resistance is smaller, and the potential rise of grounded screen is lower, such earth's surface
The current potential of current potential and the electrical equipment being connected with grounded screen is with regard to low, so as to protect staff in electrical equipment and transmission line of electricity
Personal safety.But the grounded screen of steel material, in rainy and coastal area, with the increase of service life, easily occur rotten
Erosion may make earth conductor attenuate even and be broken, destroy the original structure of grounded screen, reduce ground connection performance, lose guarantor
Protective function.
In recent years, searching grounded screen breakpoint and heavy corrosion section has become one great anti-accident measures of power department.
It was exactly to sample after certain time limit to excavate inspection that power department, which diagnoses ground net corrosion or is broken the common method of defect, according to defeated
The general configuration and rate of corrosion of soil at electric line estimate the extent of corrosion of grounded screen apertured conductor by rule of thumb.This method tool
There is blindness, heavy workload needs to consume a large amount of human and material resources and financial resources, while also restricted by live service condition,
It is difficult accurately to diagnose grounding net defect.
Utility model content
In order to solve the above technical problems, the utility model provides, a kind of diagnosis efficiency is high, easy to operate, measurement is accurately defeated
Electric line grounding net defect diagnostic device.
The technical solution adopted in the utility model is：A kind of grounding net defect diagnostic device is provided, including driving source system
And signal detection system, the driving source system include power supply, function signal generator, power amplification circuit, impedance change
Parallel operation and power frequency display unit；The power supply respectively with the function signal generator, power amplification circuit and electricity
Stream frequency display unit is connected, and the function signal generator, power amplification circuit, impedance transformer are sequentially connected, the resistance
Resistance parallel operation is also connected with the power frequency display unit and grounded screen load respectively；The function signal generator includes control
System adjusts circuit, signal generating circuit and amplification output stage, and the power amplification circuit includes input stage, pushes grade, output stage
And protected level, the protected level are connect respectively with the promotion grade and the output stage, the impedance transformer includes primary line
Circle, secondary coil and iron core, iron core of the iron core for the nanocrystalline material of annular, the primary coil and the secondary coil
It is wrapped on the iron core.
In grounding net defect diagnostic device described in the utility model, the signal detection system include search coil,
Signal processing circuit and acquisition analysis system, the signal output end of the search coil connect the input terminal of signal processing circuit, letter
The input terminal of the output termination acquisition analysis system of number processing circuit.
In grounding net defect diagnostic device described in the utility model, the search coil includes the spy of integral structure
Test coil frame is separately positioned on the search coil barricade of the search coil frame width both sides and search coil guided wave
Pipe.
In grounding net defect diagnostic device described in the utility model, the control and regulation circuit includes sinusoidal signal control
System adjusts circuit and pulse signal controls to adjust circuit, and the signal generating circuit includes sinusoidal signal generation circuit and pulse is believed
Number occur circuit, it is described amplification output stage include sinusoidal signal amplification output stage and pulse signal amplification output stage.
In grounding net defect diagnostic device described in the utility model, the primary coil and the power amplification circuit
It connects, N number of tap for being connected with grounded screen load is provided on the secondary coil, N number of tap is right respectively
Different primary and secondary coil no-load voltage ratios is answered, wherein, N is the integer more than or equal to 1.
In grounding net defect diagnostic device described in the utility model, the winding wire diameter of the primary coil is 2.0mm,
The number of turn is 160；It is set altogether on the secondary coil there are four tap, the winding wire diameter of the secondary coil is at first tap
3.7mm, be 2.0mm at second tap, at third tap and the 4th tap be 1.4mm, the circle at four taps
Number is 80.
In grounding net defect diagnostic device described in the utility model, the thickness of the iron core is 75mm, internal diameter is
180mm, outer diameter 260mm.
Driving source system in grounding net defect diagnostic device provided by the utility model is by putting existing linear power
The big improvement of device and the design of impedance transformer, in broad frequency band, under conditions of ensureing enough current output capabilities, solve
The problem of power amplifier is with grounded screen load matched, can adapt to different loads, realizes frequency and the continuous of electric current can
It adjusts, has sine wave and duty ratio two kinds of working methods of adjustable pulse signal, can be converted according to needs are measured by impedance
The selection of device no-load voltage ratio obtains higher output voltage or exciting current signal, while the frequency of output signal and electric current have number
Pipe in due course display, it is easy to use, it is widely used, can meet Ground Network of Transmission Line with Renovation ground connection performance detection and fault diagnosis it is more
Kind needs；Signal detection system is based on electromagnetic induction principle and phase lock amplifying technology, is led grounded screen grid using search coil
Body is changed into induced voltage signal in the magnetic induction intensity that earth's surface excites, under transmission line of electricity complex electromagnetic environment, to signal into
Row filtering, lock mutually amplification and extraction process, and then obtain the Magnetic Induction Density Distribution that Injection Current is excited in earth's surface, by with swashing
The cooperation of signal frequency is encouraged, can effectively inhibit the electromagnetic interference at scene, main interference frequency point is pushed aside, makes measurement accuracy and resolution
Rate disclosure satisfy that defect diagonsis requirement.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the wire structure diagram of the utility model embodiment；
Fig. 2 is the utility model embodiment middle impedance converter and the equivalent circuit diagram of load；
Fig. 3 is the utility model embodiment middle impedance converter magnetic core geometric parameter figure；
Fig. 4 is the electrical schematic diagram of the utility model embodiment middle impedance converter；
Fig. 5 is the electrical schematic diagram of the signal detection system in the utility model embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
As shown in Figure 1, the grounding net defect diagnostic device that the utility model embodiment provides is in transmission line of electricity complexity electromagnetism
Under environment, based on phase lock amplifying technology and the adjustable bandpass filter of bandpass center frequency, by matching with exciting signal frequency
It closes and adjusts, the electromagnetic interference at scene can be effectively inhibited, avoid mainly interfering frequency point, measurement accuracy and resolution ratio is enable to expire
Sufficient defect diagonsis requirement；The sine wave excitation currents of alien frequencies are injected in grounded screen, detect the distribution of earth's surface magnetic induction intensity, according to
Distribution characteristics diagnoses the state of grounding grids, if earth's surface magnetic induction intensity occurs significant change or falls above certain section of conductor
It falls, illustrate this section of conductor seriously corroded or breakpoint occurs.The device includes driving source system and signal detection system, described to swash
Source system is encouraged to show including power supply 1, function signal generator 2, power amplification circuit 3, impedance transformer 4 and power frequency
Unit 5；Power supply 1 distinguishes and function signal generator 2, power amplification circuit 3 is connected with power frequency display unit 5, letter
Number signal generator 2, power amplification circuit 3, impedance transformer 4 are sequentially connected, and impedance transformer 4 is also shown with power frequency respectively
Show unit 5 and grounded screen load connection.Specifically, function signal generator 2 includes controlling to adjust circuit 21, signal generating circuit
22 include sinusoidal signal and control to adjust circuit 21 and pulse signal control and regulation electricity with amplification output stage 23, control and regulation circuit 21
Road 21, signal generating circuit 22 include sinusoidal signal generation circuit 22 and pulse signal generation circuit 22, and amplification output stage 23 is wrapped
Include sinusoidal signal amplification output stage 23 and pulse signal amplification output stage 23.Wherein, sinusoidal signal controls to adjust circuit 21 and is used for
Signal frequency adjusting is carried out, and regulating command is sent in sinusoidal signal generation circuit 22 for staff；Sinusoidal signal occurs
Circuit 22 generates the original sine signal of corresponding frequencies based on the frequency instruction；Sinusoidal signal amplification output stage 23 is used for first
Beginning sinusoidal signal is amplified processing and obtains the sine wave signal.As it can be seen that sinusoidal signal controls to adjust circuit 21, sinusoidal signal
Circuit 22 and sinusoidal signal amplification output stage 23 occurs for generating sine wave signal and carrying out signal frequency adjusting；Carrying out letter
When number frequency is adjusted, it should be noted that sinusoidal waveform cannot be distorted.Similarly, pulse signal controls to adjust circuit 21 and is used for for staff
Signal pulse width adjusting is carried out, and regulating command is sent in pulse signal generation circuit 22；Pulse signal generation circuit 22
The inceptive impulse signal of corresponding pulses width is generated based on the PULSEWIDTH COMMAND；Pulse signal amplification output stage 23 for pair
Inceptive impulse signal is amplified processing and obtains the pulse signal.As it can be seen that pulse signal controls to adjust circuit 21, pulse signal
Circuit 22 and pulse signal amplification output stage 23 occurs for generating pulse signal and carrying out signal pulse width adjusting.Power is put
Big circuit 3 includes input stage 31, pushes grade 32, output stage 33 and protected level 34, and protected level 34 is respectively with pushing grade 32 and output
Grade 33 connects.Power amplification circuit 3 is mainly used for power amplification and the output driving current of signal.It is grounded in embodiment
During net defect diagonsis, the design principle of power amplification circuit 3 is：(1) working frequency is in the frequency band of 10Hz~50kHz；(2) it is defeated
Going out signal frequency and output current can easily continuously adjust；(3) ensureing condition of the output signal with enough driving currents
Under, itself being capable of continuous work.For above-mentioned requirements, linear prower amplifier technology, power amplification circuit 3 are used in the present embodiment
Circuit includes input stage 31, pushes grade 32, output stage 33 and protected level 34, and final stage output is formed using 10 pairs of high power transistors
The output form of complementary push-pull parallel connection, the model 2SC5200 and 2SA1943 of transistor.Specifically, input stage 31 is used to receive
The primary pumping signal exported from sinusoidal signal generator and/or pulse signal generator, and it is sequentially sent to push grade 32, defeated
Go out grade 33 to be handled, and finally obtain sinusoidal excitation signal or pulse excitation signal；Wherein, the effect of input stage 31 is to inhibit electricity
The null offset and temperature drift on road, and output voltage when making power amplification circuit 3 static is zero, so as to ensure that circuit is steady
Fixed, reliable work；The effect for pushing grade 32 is that enough driving currents are provided for output stage 33；The effect of output stage 33 be to
Load provides signal power；For protected level 34 respectively with grade 32 and output stage 33 is pushed to connect, effect is to push grade 32 and output
When the primary pumping signal of 33 pairs of grade is amplified processing, circuit is protected not to be burned out.In the prior art, for input stage 31,
Push the operation principle of 34 circuit of grade 32, output stage 33 and protected level and the more mature (bibliography of design method：The clear of Xie Yuan
Transistor low-frequency channel, People's Telecon Publishing House, 1981:275-295), details are not described herein.Impedance transformer 4 includes primary
Coil, secondary coil and iron core, iron core of the iron core for the nanocrystalline material of annular, primary coil and secondary coil are wrapped in iron core
On.Primary coil is connect with power amplification circuit 3, is provided on secondary coil for N number of tap with grounded screen load connection,
N number of tap corresponds to different primary and secondary coil no-load voltage ratios respectively, the primary and secondary coil no-load voltage ratio refer to primary coil the number of turn and
The ratio of the number of turn of secondary coil；Wherein, N is the integer more than or equal to 1.
Below according to Circuit theory, impedance transformer 4 is designed.Because duty factor transistor output impedance is much smaller,
If the output current of power output stage 33 is a monochromatic wave, by the use of a current source as its equivalent circuit, by impedance transformer 4
All parameters are converted into the primary value of converter, then impedance transformer 4 and the equivalent circuit of load are as shown in Figure 2.
In Fig. 2, C1For primary coil distribution capacity, C'2=C2/n2It is converted into for secondary coil distribution capacity to primary value,
r1Copper for primary coil hinders, r'2=n2r2It is converted into for the resistance of secondary coil copper to primary value, L1For the leakage inductance of primary coil, L'2=
n2L2It is converted into for secondary coil leakage inductance to primary value, L0To encourage inductance, R'L=n2RLIt is converted into for secondary load resistance to primary
Value, n=N1/N2No-load voltage ratio for primary and secondary.In Mid Frequency, distribution capacity and excitation inductance are considered as open circuit, and leakage inductance is considered as short
Road, at this time the total impedance of power amplifier load be：
RO=r1+r2'+R'L (1)
The transfer efficiency of impedance transformer 4 is：
η in formulaTFor transfer efficiency, 0.9 is generally taken, no-load voltage ratio can be designed according to (2) formula.Low-frequency range, distribution capacity is still
It is considered as open circuit, leakage inductance is considered as short circuit, can be listed according to Circuit theory：
Lower frequency limit is taken as：
When load and lower frequency limit determine, inductance L is encouraged0It can be acquired by (4) formula.
4 magnetic core of impedance transformer uses circular nano crystalline substance iron core, as shown in figure 3, its saturation induction density Bs is more than
1.24T, Effective permeability is up to 105, empirically formula can calculate core section product, S=0.2PLfl(cm2), P in formulaLFor impedance
The power that converter 4 is exported to load, flFor lower frequency limit；Number of primary turnsl0For excitation electricity
Sense, lcFor iron circuit average length, S is accumulated for core cross section.
The electrical schematic diagram of impedance transformer 4 is as shown in figure 4, using four kinds of no-load voltage ratios 2:1、1:1、2:3 and 1:2 tap, with
Meet different measurement needs.In the present embodiment, the winding wire diameter of primary coil is 2.0mm (i.e. shown in figure), circle
Number is 160 (i.e. 160T shown in figure), input current 30A；Tap there are four being set altogether on secondary coil, the winding of secondary coil
Line footpath is 3.7mm at first tap (i.e. shown in figure), at second tap be 2.0mm (i.e. shown in figure), at third tap and the 4th tap be 1.4mm (i.e. shown in figure), the number of turn at four taps is equal
For 80 (i.e. 80T shown in figure), output current 60A.The thickness of iron core is 75mm, internal diameter 180mm, outer diameter 260mm.Tool
Body, when selecting rheostatic as the impedance output terminal of first tap, primary and secondary coil no-load voltage ratio is 2:1；When selection second
During rheostatic as the impedance output terminal of a tap, primary and secondary coil no-load voltage ratio is 1:1；When selecting third tap as impedance
During rheostatic output terminal, primary and secondary coil no-load voltage ratio is 2:3；When selecting the 4th tap as the rheostatic output terminal of impedance
When, primary and secondary coil no-load voltage ratio is 1:2.
The armature winding (i.e. primary coil) of the output terminal connection impedance transformer 4 of power amplification circuit 3, according to measurement need
Will, suitable secondary windings is selected, that is, selects the tap of suitable secondary coil as output terminal, it is higher if necessary to export
Driving voltage signal, then select 2:3 or 1:2 primary and secondary coil no-load voltage ratio, if necessary to export higher exciting current signal,
Then select 2:1 or 1:1 primary and secondary coil no-load voltage ratio.Specifically, when measuring grounded screen electric potential signal, need to note to grounded screen
Enter the pumping signal of high voltage-small current, then select 1:2 primary and secondary coil no-load voltage ratio when measuring grounded screen magnetic field signal, needs
To the pumping signal of grounded screen injection low-voltage, high-current, then 2 are selected:1 primary and secondary coil no-load voltage ratio.As it can be seen that in the present embodiment
In, by the design of primary coil, in broad frequency band, meet the load requirement of power amplifier；By adopting secondary coil
It is exported, is realized using the method for changing primary and secondary coil no-load voltage ratio with multi-tap, according to the actual needs of measurement, promote output
Current or voltage, to obtain required pumping signal；The selection of magnetic core (i.e. iron core) material, can guarantee in working band, compared with
In the case of big operating current, there is preferable transfer efficiency.
As shown in figure 5, the signal detection system includes search coil L, signal processing circuit and acquisition analysis system C,
The signal output end of search coil L meets the input terminal of signal processing circuit, the output termination collection analysis system of signal processing circuit
The input terminal of system C.Signal processing circuit is mutually amplified by instrument amplifier YF, power frequency notch filter XB, bandpass filter LB and lock
Device SXF is formed, and the input termination search coil L of instrument amplifier YF, output terminal is successively through power frequency notch filter XB, bandpass filter
LB and lock-in amplifier SXF meets acquisition analysis system C, and the reference signal input terminal S of lock-in amplifier SXF connects excitation reference signal
Output terminal, the clock signal input terminal f of bandpass filter LBCLKConnect clock pulse generator output terminal.Because of the electromagnetism of transmission line of electricity
Environment is sufficiently complex, and Hz noise is up to tens micro- special (μ T), while also there are the variations of harmonic wave, chopper switch and line current
The electromagnetic interference Deng caused by, in order to effectively detect the Distribution of Magnetic Field of earth's surface, first with search coil L by earth's surface magnetic strength
Strength signal is answered to be changed into induced voltage signal, the search coil L in the present embodiment includes the search coil frame of integral structure
Frame is separately positioned on the search coil barricade of the search coil frame width both sides and search coil waveguide pipe；Pass through
The search coil frame of integral structure can reduce the signal leak case caused by splicing gap；By being arranged on
The shield effectiveness of coil can be improved by stating the search coil barricade of search coil frame width both sides, facilitate the peace of search coil
Dress improves production efficiency.Then using instrument amplifier as buffer stage, for suppression common mode interference and impedance transformation, power frequency is fallen into
Wave circuit inhibits 50Hz strong jammings, after notch filter, filtering are carried out to signal, locks the mutually technical finesses such as amplification, utilizes number
Measurement result is stored in computer according to acquisition system C, notch filter circuit should reach the notch depth of 50Hz 50dB, band logical filter
Wave circuit is decayed about 3dB at ± 10Hz, and 25dB is decayed at ± 45Hz, at ± 90Hz attenuation reach 50dB, by falling into
After wave and filtering process, it has to be possible to inhibit Hz noise；The pass band width of bandpass filter is relatively narrow, and centre frequency can be continuous
It adjusts, centre frequency can be adjusted in the range of 200~900Hz, and it is suitable to be set according to the actual electromagnetic background of measure field
Exciting signal frequency and the centre frequency for receiving system, can effectively extract useful signal.
Driving source system in the utility model embodiment is become by the improvement to existing linear power amplifier and impedance
The design of parallel operation in broad frequency band, under conditions of ensureing enough current output capabilities, solves power amplifier and grounded screen
The problem of load matched, can adapt to different loads, realize the continuously adjustable of frequency and electric current, has sine wave and accounts for
Sky than adjustable two kinds of working methods of pulse signal, can according to measuring needs, by the selection of impedance transformer no-load voltage ratio, obtain compared with
High output voltage or exciting current signal, while the frequency of output signal and electric current have charactron to show in due course, it is easy to use,
It is widely used, a variety of needs of Ground Network of Transmission Line with Renovation ground connection performance detection and fault diagnosis can be met；Signal detection system
Based on electromagnetic induction principle and phase lock amplifying technology, the magnetic induction for being excited grounded screen apertured conductor in earth's surface using search coil
Intensity is changed into induced voltage signal, and under transmission line of electricity complex electromagnetic environment, signal is filtered, is locked and is mutually amplified and extract
Processing, and then the Magnetic Induction Density Distribution that Injection Current is excited in earth's surface is obtained, it, can by the cooperation with exciting signal frequency
Effectively inhibit the electromagnetic interference at scene, push main interference frequency point aside, measurement accuracy and resolution ratio is made to disclosure satisfy that defect diagonsis will
It asks.
The embodiment of the utility model is described above in association with attached drawing, but the utility model is not limited to
The specific embodiment stated, above-mentioned specific embodiment is only schematical rather than restricted, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (7)
1. a kind of grounding net defect diagnostic device, which is characterized in that including driving source system and signal detection system, the excitation
Source system includes power supply, function signal generator, power amplification circuit, impedance transformer and power frequency display unit,
The power supply is connected respectively with the function signal generator, power amplification circuit and power frequency display unit, described
Function signal generator, power amplification circuit, impedance transformer are sequentially connected, the impedance transformer also respectively with the electric current
Frequency display unit and grounded screen load connection；The function signal generator includes controlling to adjust circuit, signal generating circuit
With amplification output stage, the power amplification circuit includes input stage, pushes grade, output stage and protected level, the protected level difference
It is connect with the promotion grade and the output stage, the impedance transformer includes primary coil, secondary coil and iron core, the iron
Iron core of the core for the nanocrystalline material of annular, the primary coil and the secondary coil are wrapped on the iron core.
2. grounding net defect diagnostic device according to claim 1, which is characterized in that the signal detection system includes visiting
Test coil, signal processing circuit and acquisition analysis system, the signal output end of the search coil connect the defeated of signal processing circuit
Enter end, the input terminal of the output termination acquisition analysis system of signal processing circuit.
3. grounding net defect diagnostic device according to claim 2, which is characterized in that the search coil includes integration
The search coil frame of structure, the search coil barricade for being separately positioned on the search coil frame width both sides and detection
Coil waveguide pipe.
4. grounding net defect diagnostic device according to claim 1, which is characterized in that the control and regulation circuit is included just
String signal controls to adjust circuit and pulse signal controls to adjust circuit, and the signal generating circuit includes sinusoidal signal generation circuit
And pulse signal generation circuit, the amplification output stage include sinusoidal signal amplification output stage and pulse signal amplification output stage.
5. grounding net defect diagnostic device according to claim 1, which is characterized in that the primary coil and the power
Amplifying circuit connects, and is provided on the secondary coil for N number of tap with grounded screen load connection, N number of pumping
Head corresponds to different primary and secondary coil no-load voltage ratios respectively, wherein, N is the integer more than or equal to 1.
6. grounding net defect diagnostic device according to claim 5, which is characterized in that the winding wire diameter of the primary coil
For 2.0mm, the number of turn 160；Tap there are four being set altogether on the secondary coil, the winding wire diameter of the secondary coil is at first
It is 3.7mm at tap, at second tap be 2.0mm, at third tap and the 4th tap is 1.4mm, four pumpings
The number of turn at head is 80.
7. grounding net defect diagnostic device according to claim 1, which is characterized in that the thickness of the iron core for 75mm,
Internal diameter is 180mm, outer diameter 260mm.
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| CN201721642193.6U CN207473034U (en) | 2017-11-30 | 2017-11-30 | A kind of grounding net defect diagnostic device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801892A (en) * | 2018-06-19 | 2018-11-13 | 国家电网公司 | Grounding net of transformer substation corrosion diagnosis method and system |
| CN110927516A (en) * | 2019-11-14 | 2020-03-27 | 长沙理工大学 | Power distribution network single-phase earth fault identification method and system based on grounding transformer tap grounding |
| CN112986380A (en) * | 2021-03-08 | 2021-06-18 | 重庆璀陆探测技术有限公司 | Combined pulse source electromagnetic detection method and device of grounding grid topological structure |
-
2017
- 2017-11-30 CN CN201721642193.6U patent/CN207473034U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801892A (en) * | 2018-06-19 | 2018-11-13 | 国家电网公司 | Grounding net of transformer substation corrosion diagnosis method and system |
| CN108801892B (en) * | 2018-06-19 | 2020-09-29 | 国家电网公司 | Transformer substation grounding grid corrosion diagnosis method and system |
| CN110927516A (en) * | 2019-11-14 | 2020-03-27 | 长沙理工大学 | Power distribution network single-phase earth fault identification method and system based on grounding transformer tap grounding |
| CN110927516B (en) * | 2019-11-14 | 2022-01-21 | 长沙理工大学 | Power distribution network single-phase earth fault identification method and system based on grounding transformer tap grounding |
| CN112986380A (en) * | 2021-03-08 | 2021-06-18 | 重庆璀陆探测技术有限公司 | Combined pulse source electromagnetic detection method and device of grounding grid topological structure |
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