CN109444555A - A kind of grounded screen impedance frequency conversion detection method and device - Google Patents
A kind of grounded screen impedance frequency conversion detection method and device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
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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
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Abstract
A kind of grounded screen impedance frequency conversion detection system and method, using the view of frequency variation signal emission system and impedance measurement system measurement grounded screen at different frequencies in ground connection total impedance, and it is compared with theoretical simulation calculated result, due to the influence of grounding grids and SOIL DISTRIBUTION parameter, the impedance ground of grounded screen at different frequencies is increased with the increase of frequency, and grounding grids corrosion is more serious, the higher characteristic rule of impedance ground under same frequency, obtains the information of grounded screen large area extent of corrosion.Operation of the present invention is easy, not by soil parameters, weather, etc. factors influenced, in the case where not needing ground connection dictyosome drawing, being not required to tracking measurement comparison and not influencing electric system to operate normally, obtain ground net corrosion status information.The present invention cannot be only used for electric system, it can also be used to communicate, the Corrosion monitoring of departments' grounded screen such as petrochemical industry, radar station and performance evaluation.
Description
Technical field
The present invention relates to one kind in the case where substation operates normally, and detects ground net corrosion state and assessment grounded screen
The method of security performance solves detection efficiency and precision that grounded screen large area general corrosion attenuates, belongs to electric system detection
Technical field.
Background technique
Grounded screen is played and is extremely closed to the safe operation and lightning protection of the facilities such as substation, iron tower of power transmission line, communication steel tower
The effect of key.The electrical equipment of substation is connected with grounded screen mostly, one public potential reference is provided by grounded screen, when
When electric system is struck by lightning or is broken down, fault current is subjected to the ground potential liter for draining to reduce substation in time,
The expansion of accident is avoided, therefore relevant production and operation department are to the detection of grounded screen state and the appraisal procedure of ground connection performance
It is extremely paid close attention to measure.
The grounded screen of substation is generally latticed, and the grounded screen of steel tower is usually annular or small network trellis, Chang Liyong
The materials such as band steel or round steel are welded to form, the general depth for being embedded to 0.6 to 0.8 meter of underground, first is that the work of Operation of Electric Systems
It needs, second is that playing the role of release lightning current and short-circuit current, impedance ground is pressed and reduced in earth surface area.According to
It needs to there is earth conductor to be connected with the electrical equipment on ground at the different location of grounded screen apertured conductor.In high corrosion soil
Region, buried ground connection dictyosome easily occur corrosion and are damaged, and earth conductor sectional area may be made to reduce or be broken, destroyed original
Design structure, reduce ground connection performance, lose defencive function, become electric system production and operation department security risk.Cause
This, detects the defect and etch state of grounding grids, assesses the security performance of grounded screen, find grounded screen hidden danger position and
State, and carry out maintenance in time and have become one important preventive damage control of power department.
Diagnosis ground net corrosion or the common method for being broken defect were exactly to sample after certain time limit to excavate inspection, according to connecing
Ground dictyosome is distributed the general configuration and rate of corrosion of soil, by rule of thumb the etch state of estimation ground connection dictyosome.This method has blind
Mesh, heavy workload need to consume a large amount of human and material resources and financial resources, while the restriction also by live service condition, are difficult
The accurately defect of diagnosis earthing or grounding means.For latticed grounding body, researcher has also carried out a lot of research work, carries out
The trial of some new methods, for example, electrochemical method, Electromagnetic wave, node mutual impedance method, surface potential method, transition
Electromagnetic method etc..The above method provides some thinkings for the detection of giant ground dictyosome, and there is also many in practice
Limitation.Wherein, electrochemical method can analysis project it is few, local information can only be obtained;Ground Penetrating Radar is for being grounded dictyosome
There is lack of resolution in detection;Node mutual impedance method needs accurately grounded screen drawing, and tracking and monitoring is needed to compare, and
Vulnerable to the influence of the factors such as weather, edaphic condition, detection cycle length, low efficiency.In practical projects, when grounding grids part
When corroding or small fracture occur, surface potential variation is smaller, is also difficult for being grounded the etch state of dictyosome and finding breakpoint
's.The state that electromagnetic method attenuates for ground connection dictyosome large area entirety homogeneous corrosion is also difficult to detect.
With the development of China's electric system, installed capacity increases year by year, and the detection of grounded screen and maintenance technology need together
How step innovation and raising fast and accurately detect the etch state and assessment security performance of grounded screen, are production run department
Accurately and reliably testing result is provided, it is significant for the excavation inspection and grounded screen replacement that avoid blindness.
Summary of the invention
Attenuate the detection method of degree the purpose of the present invention is to provide a kind of grounded screen extensive erosion, realizes letter
Just, the evaluation of state-detection and grounded screen general safety performance practical, accurately attenuate to grounded screen extensive erosion, not only
The problem of grounded screen live detection may be implemented, and scientific basis can be provided for the design and maintenance of grounded screen.
On the one hand, the present invention proposes a kind of grounded screen impedance frequency conversion detection system, is surveyed by frequency variation signal emission system, impedance
Amount system and current transformer composition;Frequency variation signal emission system emits the signal of different frequency, and impedance measurement system measurement connects
The impedance of earth mat, current transformer are picked up by grounded screen, the first cable, the second cable, frequency variation signal emission system and big
The electric current in the circuit that ground soil is constituted is input to the current input terminal mouth of impedance measurement system, it is characterised in that: is connect by measurement
The impedance ground of earth mat at different frequencies, and compared with Theoretical Design result, obtain the large area corrosion journey of grounding grids
Information is spent, and evaluates the general safety performance of grounded screen with this, provides the scientific basis and decision references whether grounded screen is repaired.
Further, frequency variation signal emission system is become by frequency-selector, signal generator, pusher, power amplifier and output
Depressor composition.
Further, signal generator generates different frequent points sine wave signal, and frequency-selective amplifier is for selecting and controlling signal
The input terminal of the output frequency of generator, signal generator and pusher connects, the sine wave signal note of signal generator output
Enter the input terminal of pusher, the output end of pusher and the input terminal of power amplifier connect, the output end of power amplifier with
The primary connection for exporting transformer, exports signal output end of the secondary of transformer as entire frequency variation signal emission system.
Further, impedance measurement system by voltage filter, current filter, A/D conversion module, Survey Software is installed
Notebook terminal composition.
Further, the input port of voltage filter and current filter respectively with voltage port to be measured and current terminal to be measured
Mouth connection, output end are separately connected the input terminal of A/D conversion module, and the output end of A/D conversion module passes through data line and notes
This computer terminal connection, by the acquisition, storage and analysis of the software realization data installed on laptop.
Further, the software systems are after starting initialization, receive and store voltage that the transmission of A/D conversion module comes and
Then current digital signal carries out Fast Fourier Transform (FFT) to frequency domain, line frequency spectrum analysis of going forward side by side respectively obtains the amplitude-frequency spy of signal
Property and phase-frequency characteristic, and the real part of impedance ground is obtained by amplitude-frequency characteristic, the imaginary part of impedance ground is obtained by phase-frequency characteristic, by connecing
Ground connection view is calculated in total impedance in the real and imaginary parts of ground impedance.
On the other hand, the present invention proposes that a kind of grounded screen impedance frequency conversion detection method, frequency variation signal emission system emit not
The signal of same frequency, impedance measurement system measure grounded screen impedance, current transformer pick up by grounded screen, the first cable,
The electric current in the circuit that the second cable, frequency variation signal emission system and the earth soil are constituted is input to the electric current of impedance measurement system
Input port, it is characterised in that: by measurement grounded screen impedance ground at different frequencies, and with Theoretical Design result ratio
Compared with obtaining the large area extent of corrosion information of grounding grids, and evaluate the general safety performance of grounded screen with this, provide ground connection
Scientific basis and decision references whether net is repaired.
Further, the cathode output end of frequency variation signal emission system passes through in one end Jie grounded screen of the first cable, separately
One end is grounded by the second cable.
Further, voltage input port one end of impedance measurement system connects grounded screen, another termination soil.
Further, the signal of frequency variation signal emission system transmitting different frequent points, is obtained by impedance measurement system automatic measurement
View of the grounded screen under different frequency point is in impedance ground, and impedance measurement system is by turning the voltage and current filtering of input, A/D
It changes, and after the software on notebook computer terminal carries out Fourier transformation and spectrum analysis, exports different frequent points impedance ground
Result information.
Further, the signal generator of frequency variation signal emission system generates different frequent points sine wave signal, frequency variation signal hair
The frequency-selective amplifier for penetrating system emits for selected and control signal generator output frequency, signal generator and frequency variation signal
The input terminal of the pusher of system connects, the input terminal of the sine wave signal injection pusher of signal generator output, pusher
Output end connect with the input terminal of the power amplifier of frequency variation signal emission system, the output end of power amplifier and frequency conversion are believed
The primary connection of the output transformer of number emission system, exports letter of the secondary of transformer as entire frequency variation signal emission system
Number output end.
Further, the input port of the voltage filter of impedance measurement system and current filter respectively with voltage end to be measured
Mouth is connected with electric current port to be measured, and output end is separately connected the input terminal of the A/D conversion module of impedance measurement system, A/D conversion
The output end of module is connected by the notebook computer terminal of data line and impedance measurement system, by what is installed on laptop
Acquisition, storage and the analysis of software realization data.
The present invention solves the state-detection that grounded screen large area homogeneous corrosion attenuates and grounded screen general safety performance is commented
The technical problem of valence assessment, can provide reliable reference for operating maintenance department, decide whether to replace or repair.
Detailed description of the invention
Fig. 1 is frequency variation signal emission system structure principle chart;
Fig. 2 is impedance measurement system structure principle chart;
Fig. 3 is grounded screen impedance frequency conversion detection method schematic diagram;
Fig. 4 is grounded screen computing structure model figure;
Fig. 5 is the changing rule characteristic pattern of different frequent points impedance and ground net corrosion state;
Fig. 6 is Grounding impedance measurement program flow diagram.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawing.
The invention discloses a kind of grounded screen impedance frequency conversion detection systems, by frequency variation signal emission system (101) and resistance
Anti- measuring system (102), current transformer (i) composition.Frequency variation signal emission system (102) is occurred by frequency-selector (301), signal
Device (302), pusher (303), power amplifier (304) and output transformer (305) composition.Impedance measurement system (101) by
Voltage filter (201), current filter (202), A/D conversion module (203), notebook terminal (204) composition.Notebook is whole
Survey Software is installed on end.
The structural principle of frequency variation signal emission system (101) is as shown in Figure 1, its frequency-selective amplifier (301) is used to select simultaneously
The output frequency of control signal generator (302), signal generator (302) are connect with the input terminal of pusher (303), pusher
(303) output end is connect with the input terminal of power amplifier (304), the output end and output transformation of power amplifier (304)
The primary connection of device (305), exports letter of the secondary of transformer (305) as entire different frequent points signal transmitting system (101)
Number output end.Signal generator (302) generates different frequent points sine wave signal, and frequency is set and adjusted by frequency-selector (301),
The input terminal of sine wave signal injection pusher (303) of signal generator output, amplified driving power amplifier
(304)。
Frequency-selector (301) model can be CD4066BE, and signal generator (302) model can be MAX038, pusher (303)
Model can be 3CG2201, power amplifier (304) model can be MWPA-010M10.Exporting transformer (305) is wideband liter
Pressure transformer uses nanocrystalline round magnetic core, 150 millimeters of magnetic core internal diameter, 250 millimeters of outer diameter, primary sharp with a thickness of 50 millimeters
With 1.2 millimeters of line footpath of copper enameled wires around 200 circles, secondary is using the enameled wire of line footpath 0.47 around 2000 circles, no-load voltage ratio 1:10.
The structural principle of impedance measurement system (102) is as shown in Fig. 2, voltage filter (201) and current filter (202)
Input port connect respectively with voltage port to be measured and electric current port to be measured, output end is separately connected A/D conversion module (203)
Input terminal, the output end of A/D conversion module (203) connect by data line with notebook computer terminal.
Voltage filter (201) picks up the voltage signal of port to be measured by voltage transformer, is input to A/D conversion module
(203) voltage input port, current filter (202) pick up electric current letter by current transformer (i) from the second cable (L)
Number, the current input terminal mouth of A/D conversion module (203) is input to after current filtering, after A/D conversion module (203) will filter
Two 2 road signal of voltage and current carry out the conversion of analog signal to digital signal respectively, pen is then transferred to by data line
After remembering that this terminal computer, notebook terminal software carry out Fast Fourier Transform (FFT), spectrum analysis to two paths of signals, processing output is connect
Ground impedance.The model of voltage filter (201) can are as follows: B3022, the model of current filter (202) can be F241, A/D conversion
Module (203) can be NI6259.
Attached drawing 3 is grounded screen impedance frequency conversion detection method schematic diagram.When being detected, frequency variation signal emission system
(101) cathode output end is another to terminate at soil by (the M point in such as Fig. 3) in one end Jie grounded screen of the first cable
In, as shown in Figure 3, the other end is by the second cable (L) ground connection (N point), as N point can be 20 meters away from grounded screen~40 meters.
One circuit is constituted by grounded screen, the first cable, the second cable, frequency variation signal emission system (101) and the earth soil.Resistance
The voltage input port (voltage measurement port) one of anti-measuring system (102) terminates grounded screen (the P point in such as Fig. 3), the other end
It connects soil (the Q point in such as figure), pickup port voltage, 60 meters away from grounded screen~80 meters of Q point.The electricity of impedance measurement system (102)
Flow measurement port is connected by current transformer (i) and the second cable (L) coupling, current transformer (i) pickup by grounded screen,
The electric current in the circuit that the first cable, the second cable, frequency variation signal emission system (101) and the earth soil are constituted is input to resistance
The current input terminal mouth of anti-measuring system (102).Frequency variation signal emission system (101) emits the signal of different frequent points, by impedance
Measuring system (102) automatic measurement obtains view of the grounded screen under different frequency point in impedance ground, impedance measurement system (102)
By converting to the voltage and current filtering of input, A/D, and Fourier transformation and frequency are carried out through the software on notebook computer terminal
After spectrum analysis, different frequent points impedance ground result information is exported.
The state-detection principles illustrated that grounded screen extensive erosion attenuates is as follows.Currently, the theoretical analysis method of grounded screen
More mature, internationally famous grounded screen electromagnetism calculating analysis software packet (CDEGS) can be used for the theoretical simulation of grounded screen
It calculates and analysis, the validity and reliability of analysis result is approved both at home and abroad, be as shown in Fig. 4 the meter of certain grounded screen
Model is calculated, which is that certain 220kV substation main grounding grid structure chart, laterally (direction x) and longitudinal (direction y) respectively have 11
Root conductor is constituted, and every conductor is divided into 10 sections.The view of grounded screen point (such as P point) at different frequencies is calculated using CDEGS
In impedance ground.
Attached drawing 5 is the changing rule characteristic pattern of different frequent points impedance ground and ground net corrosion state.As can be seen that due to
The influence of grounded screen and SOIL DISTRIBUTION parameter (distributed inductance and distribution capacity), impedance ground the increasing with frequency of grounded screen
And it becomes larger;The corrosion of grounded screen sectional area is more serious, and under same frequency, it is higher to connect Low ESR, and this higher change of frequency
Change is more obvious.Generally when constituting the sectional area extent of corrosion of grounding grids less than 50%, not to the security performance of grounded screen
It will cause too much influence;If it is greater than 50% it is necessary to repairing or re-lay in time.From figure 5 it can be seen that when signal frequency
When rate is higher than 200kHz, different extent of corrosions, impedance ground variation is obvious, and the every corrosion 25% of grounding grids sectional area connects
Ground impedance increases 1~2 ohm.
Attached drawing 6 is Grounding impedance measurement program flow diagram.It will test after device carries out connection installation as above,
And after starting initialization, terminal laptop receives and stores the two-way voltage and electricity that A/D conversion module (203) transmission comes
Then streaming digital signal carries out Fast Fourier Transform (FFT) to frequency domain and respectively obtains the width of signal next, carrying out spectrum analysis
Frequency characteristic and phase-frequency characteristic, and the real part of impedance ground is obtained by amplitude-frequency characteristic, the imaginary part of impedance ground is obtained by phase-frequency characteristic,
Ground connection view is calculated in total impedance by the real and imaginary parts of impedance ground.If necessary to duplicate measurements, then the acquisition returned is deposited
Link is stored up, is measured next time, does not need duplicate measurements such as, then exported result and terminate program.
The frequency variation signal emission system that the present invention uses sets working frequency in measurement first, such as uses frequency variation signal
The frequency of emission system is (200kHz~1MHz).Signal is tested by grounded screen and distal end soil injection, is connect according to being detected
The size of earth mat determines output voltage and current strength.For general work limiting voltage in the range of 50V~200V, maximum can
To reach 500V, operating current is limited in the range of 1A~5A, and maximum can achieve 10A.
Impedance measurement system measures complex impedance (including real impedance and 2 liang of imaginary part induction reactance of grounded screen at different frequencies
Part), the view of grounded screen at different frequencies is obtained in ground connection total impedance by Fast Fourier Transform (FFT), spectrum analysis.It can be with
Duplicate measurements is realized in short time, easily reasonably to evade measurement error.Measurement and data processing include computer and
Corresponding software program can directly obtain the view of grounded screen at different frequencies in impedance ground, analysis grounding net general corrosion
The case where and evaluate its security performance.
Here is that one embodiment of actual measurement is carried out using method and system of the invention.Table 1 is to become in certain 110kV
The test result of power station grounded screen.The grounded screen all uses the zinc-coated flat steel sheet design that sectional area is 55mm × 5m to be welded,
We measure ground connection resistance of the grounded screen in the case where 200kHz, 400kHz, 600kHz, 800kHz and 1000kHz are put again and again respectively
It is anti-.Meanwhile by the original design structure of grounded screen, the impedance ground of the grounded screen under the corresponding frequency of simulation calculation.From table 1
As can be seen that measurement result is apparently higher than calculated value under each frequency point, we pass through comparison attached drawing 5 again, analyze the ground connection
Net conductor cross sectional area extent of corrosion is about 65% or so.Thus, it is proposed that transport inspection department door is repaired in time, checks discovery by excavating
There is large area corrosion really in the grounded screen, and corrodes more serious, next year, and the weight of copper-clad conductor has all been carried out to the grounded screen
It is new to be laid with, eliminate security risk.
Impedance ground under certain the 110kV grounding net of transformer substation different frequency of table 1
The present invention is difficult to detect the problem that grounded screen extensive erosion attenuates for the prior art, provides a kind of grounded screen
Impedance frequency conversion detection method and device are operated normally not excavating, not having a power failure, be not required to grounded screen drawing, do not influence electric system
Under the premise of, by the impedance ground of measurement grounded screen at different frequencies, analysis grounding net conductor large area corrosion condition is simultaneously
Evaluate its general safety performance.It is one with frequency variation signal emission system, impedance measurement system, computer and simulation analysis program
A whole set of detection system constituted.It can be not only used for the detection of power plant, grounding net of transformer substation, it can also be used to iron tower of power transmission line,
The detection of the grounded screens such as communications tower and petrochemical industry pump gas station.Its method is easy, detection is accurate, scientific, engineering practicability is strong.
Claims (12)
1. a kind of grounded screen impedance frequency conversion detection system, by frequency variation signal emission system, impedance measurement system and current transformer
Composition;The signal of the frequency variation signal emission system transmitting different frequency, the impedance measurement system measure the grounded screen
Impedance, the current transformer are picked up by the grounded screen, the first cable, the second cable, frequency variation signal transmitting system
The electric current in the circuit that system and the earth soil are constituted is input to the current input terminal mouth of the impedance measurement system, it is characterised in that:
By measuring the impedance ground of the grounded screen at different frequencies, and compared with Theoretical Design result, the grounded screen is obtained
The large area extent of corrosion information of conductor, and general safety performance of grounded screen is evaluated with this, it provides the grounded screen and repairs
Scientific basis and decision references whether copying.
2. a kind of grounded screen impedance frequency conversion detection system according to claim 1, which is characterized in that the frequency variation signal hair
System is penetrated to be made of frequency-selector, signal generator, pusher, power amplifier and output transformer.
3. a kind of grounded screen impedance frequency conversion detection system according to claim 2, which is characterized in that the signal generator
Different frequent points sine wave signal is generated, the frequency-selective amplifier is described for selected and control signal generator output frequency
Signal generator is connect with the input terminal of the pusher, and the sine wave signal of the signal generator output injects the promotion
The input terminal of device, the output end of the pusher are connect with the input terminal of the power amplifier, the power amplifier it is defeated
Outlet is connect with the primary of the output transformer, and the secondary of the output transformer is as entire frequency variation signal emission system
Signal output end.
4. a kind of grounded screen impedance frequency conversion detection system according to claim 1, which is characterized in that the impedance measurement system
System is made of voltage filter, current filter, A/D conversion module, the notebook terminal for being equipped with Survey Software.
5. a kind of grounded screen impedance frequency conversion detection system according to claim 4, which is characterized in that the voltage filter
It is connect respectively with voltage port to be measured and electric current port to be measured with the input port of current filter, output end is separately connected described
The output end of the input terminal of A/D conversion module, the A/D conversion module is connected by data line and the notebook computer terminal
It connects, by acquisition, storage and the analysis of the software realization data installed on the laptop.
6. a kind of grounded screen impedance frequency conversion detection system according to claim 5, which is characterized in that the software systems warp
After starting initialization, the voltage and current digital signal that the A/D conversion module transmission comes is received and stored, is then carried out quick
Fourier transformation is to frequency domain, and line frequency spectrum analysis of going forward side by side respectively obtains the amplitude-frequency characteristic and phase-frequency characteristic of signal, and by amplitude-frequency characteristic
The real part of impedance ground is obtained, the imaginary part of impedance ground is obtained by phase-frequency characteristic, is calculated by the real and imaginary parts of impedance ground
To ground connection view in total impedance.
7. a kind of grounded screen impedance frequency conversion detection method, frequency variation signal emission system emits the signal of different frequency, impedance measurement
The impedance of systematic survey grounded screen, current transformer is picked up to be sent out by grounded screen, the first cable, the second cable, frequency variation signal
The electric current for penetrating the circuit of system and the earth soil composition is input to the current input terminal mouth of impedance measurement system, it is characterised in that:
By measuring the impedance ground of the grounded screen at different frequencies, and compared with Theoretical Design result, the grounded screen is obtained
The large area extent of corrosion information of conductor, and general safety performance of grounded screen is evaluated with this, it provides the grounded screen and repairs
Scientific basis and decision references whether copying.
8. a kind of grounded screen impedance frequency conversion detection method according to claim 7, it is characterised in that: the frequency variation signal hair
The cathode output end of system is penetrated by the way that in grounded screen described in the one end Jie of the first cable, the other end passes through second electricity
Cable ground.
9. a kind of grounded screen impedance frequency conversion detection method according to claim 7, it is characterised in that: the impedance measurement system
Voltage input port one end of system connects the grounded screen, another termination soil.
10. a kind of grounded screen impedance frequency conversion detection method according to claim 7, it is characterised in that: the frequency variation signal
Emission system emits the signal of different frequent points, obtains the grounded screen in different frequency by the impedance measurement system automatic measurement
The lower view of point is in impedance ground, and the impedance measurement system is by voltage and current filtering, the A/D conversion to input, and through taking down notes
After software on this computer terminal carries out Fourier transformation and spectrum analysis, different frequent points impedance ground result information is exported.
11. a kind of grounded screen impedance frequency conversion detection system according to claim 7, which is characterized in that the frequency variation signal
The signal generator of emission system generates different frequent points sine wave signal, and the frequency-selective amplifier of the frequency variation signal emission system is used
In selected and control signal generator output frequency, the input terminal of the pusher of signal generator and frequency variation signal emission system
Connection, the input terminal of the sine wave signal injection pusher of signal generator output, the output end and frequency variation signal of pusher are sent out
Penetrate the input terminal connection of the power amplifier of system, the output end of power amplifier and the output transformation of frequency variation signal emission system
The primary connection of device, exports signal output end of the secondary of transformer as entire frequency variation signal emission system.
12. a kind of grounded screen impedance frequency conversion detection system according to claim 7, which is characterized in that the impedance measurement
The voltage filter of system and the input port of current filter are connect with voltage port to be measured and electric current port to be measured respectively, defeated
Outlet is separately connected the input terminal of the A/D conversion module of the impedance measurement system, and the output end of the A/D conversion module passes through
Data line is connect with the notebook computer terminal of the impedance measurement system, by the software realization installed on the laptop
Acquisition, storage and the analysis of data.
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CN110907343A (en) * | 2019-11-18 | 2020-03-24 | 深圳供电局有限公司 | Method for detecting corrosion rate of grounding grid |
CN110907344A (en) * | 2019-11-18 | 2020-03-24 | 深圳供电局有限公司 | Grounding grid corrosion rate detection system |
CN113504411A (en) * | 2021-06-29 | 2021-10-15 | 合肥工业大学 | Large-scale grounding grid grounding resistance multi-factor evaluation method |
CN114371362A (en) * | 2021-12-09 | 2022-04-19 | 国网甘肃省电力公司庆阳供电公司 | Transformer substation grounding grid corrosion state frequency conversion detection device and use method |
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