CN108548989A - Using the grounded screen health state evaluation system and method for linear discrete model parameter - Google Patents
Using the grounded screen health state evaluation system and method for linear discrete model parameter Download PDFInfo
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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
- G01R31/088—Aspects of digital computing
Abstract
The present invention relates to a kind of grounded screen health state evaluation system and method using linear discrete model parameter, which includes step current signal source module (1), grounded screen module (2), input current and response output voltage waveforms acquisition memory module (3), linear discrete model and parameters identification module (4) and the grounded screen health state evaluation module (5) of Parameter adjustable.Compared with prior art, the present invention has the advantages that simple, accurate and is not limited by live service condition.
Description
Technical field
The present invention relates to grounding net of transformer substation health state evaluation fields, and linear discrete model is used more particularly, to a kind of
The grounding net of transformer substation health state evaluation system and method for parameter.
Background technology
The ground connection of substation is the important measures for ensureing power system security reliability service, and general method is laying ground connection
Net, the only not various electrical equipments of grounded screen with providing a common reference, and can be drained rapidly in electric power system fault
Fault current, and reduce the raising of ground potential.Thus the quality of Grounding performance is directly related to work of electric power system people
The safety and normal operation of the personal safety and various electrical equipments of member.In recent years, with the rapid growth of power demand, electric power
System scale and capacity expand rapidly, and earth short circuit current is increasing, are proposed to the security reliability of grounded screen higher
It is required that.Lay the main band steel of material used in grounded screen, failure welding when construction, soil corrosion, earth short circuit current it is electronic
The reasons such as force effect cause the burn into of band steel and grounding flat steel to be broken, and ground connection performance is made to decline.When ground short circuit occurs for system
When, ground potential exception may be caused or be unevenly distributed, the offset and the danger in machine shell of electric equipment of neutral point in electric power system
Voltage.Therefore, develop Fault Diagnosis for Grounding Grids technology, carried out using assessment especially by field testing procedure and technology, and
When understand grounded screen " health " state, avoid the generation of accident, greatly reduce stop use as a servant the time and excavate repair workload,
The expense for excavating repair is saved, there is important economic implications and social effect.
By retrieval, China Patent Publication No. is that CN107561407A discloses a kind of distributed grounding net of transformer substation inspection
It surveys and appraisal procedure, is the soil model in inverting substation and substation grounding according to design of grounding grid of substation file
The power-frequency earthing impedance value of net；Ground potential raising, step voltage and contact voltage when calculating ground fault occurs in substation
Characteristic parameter；Calculate the ground potential liter of substation in the case that different location is broken down, step voltage and contact voltage feature
Parameter；In conjunction with distributed grounded screen state evaluation device, the earth conductor operating status of grounded screen is detected, and to difference
When the position of fault, grounded screen characteristic parameter is calculated under earth conductor current state；The current state of conductor is compared
Identification, obtains the globality assessment result of earthing or grounding means in current transformer substation.The present invention can be realized to Grounding conductor
The tracking of operating status, takes timely measure, and excludes the accident for influencing equipment and personnel safety.But the invention is by simulating not
When breaking down with place, the characteristic parameters such as ground potential liter, step voltage, the contact voltage in substation are measured, it is cumbersome
Complexity influences operation condition in site.
Invention content
Linear discrete is used it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of
The grounding net of transformer substation health state evaluation system and method for model parameter.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of grounded screen health state evaluation system using linear discrete model parameter, which is characterized in that the system packet
Include step current signal source module, grounded screen module, input current and the response output voltage waveforms acquisition storage of Parameter adjustable
Module, linear discrete model and parameters identification module and grounded screen health state evaluation module；
The step current signal source module of the Parameter adjustable generates unlike signal electric current and is infused in grounded screen module,
The step current signal of the input current and response the output voltage waveforms acquisition of acquisition memory module and storage Parameter adjustable
The response output voltage signal waveform for the input current signal waveform and grounded screen module ground downlead that source module generates, it is described
Linear discrete model and parameters identification module to input current and response output voltage waveforms acquisition memory module provide electric current
It is handled with voltage waveform data, obtains the equivalent resistance point that the grounded screen is calculated analysis by linear discrete model and parameters identification
R, equivalent inductance component L and comprehensive parameters X are measured, grounded screen health state evaluation module, the grounded screen health shape are stored in
State evaluation module utilizes current data and historical data, value analysis is changed, to assess the operation of the grounding net of transformer substation
State.
Preferably, the linear discrete model and parameters identification mould linear discrete model in the block is defined as：
Process noise is represented with e (k), is used for the random disturbances of model itself, due to its presence, the model output that makes
Y (k) becomes：
Wherein, u (k) is the certainty input quantity of model；a1For equivalent resistance components R to be identified；b1It is to be identified etc.
Imitate inductive component L；b0For comprehensive parameters X to be identified；
If the noise of input quantity is denoted as s (k), the measured value of input quantity is denoted as x (k), then has：
X (k)=u (k)+s (k)
In addition, outlet side measurement noise ω (k) is superimposed upon the measured value for becoming output quantity on y (k), it is denoted as z (k)：
Z (k)=y (k)+ω (k)
According to above-mentioned, the model of calculating is obtained：
At this point, input quantity x (k) and output quantity z (k) are measured values.
Preferably, the model and parameters identification uses identified off-line mode, i.e., collected data is stored in hard disk
In, data are subjected to batch processing.
Preferably, the model and parameters identification method includes relevant function method, step response method, impulse response method and frequency
Rate response method.
Preferably, when using relevant function method, data are not required to carry out denoising；When using step response method, pulse
When response method and frequency response method, data need to first carry out denoising.
Preferably, the health state evaluation is defined as：
Parameter current X and history parameters X' relative change rates calculate as follows：
For the relative change rate of equivalent comprehensive parameters；
Then,
For the relative change rate of equivalent resistance component；
For the relative change rate of equivalent inductance component；
According to above three relative change rate's numberical range, following assessment rule is established：Change when two of which is opposite
When rate is I grades, grounding net of transformer substation health state evaluation is JK；When one is I grades, one in two of which relative change rate
When being II grades, grounding net of transformer substation health state evaluation is YJK；In the case of remaining, grounding net of transformer substation health state evaluation is
DB；
Defined in it：I grades are BHL≤10%, and II grades are 10% ＜ BHL≤50%, and III level is BHL ＞ 50%, and JK is strong
Health state, YJK are sub-health state, and DB is operating status in spite of illness.
Preferably, the alterable setting of the numberical range of three category level I, II and III relative change rate BHL.
Preferably, the step current signal source module of the Parameter adjustable is step wave current signal generator；
The response output voltage waveforms acquisition memory module is high-speed data acquiring device.
Preferably, the linear discrete model and parameters identification module and grounded screen health state evaluation module are respectively to fill
Be loaded with the portable computer of linear discrete model and parameters identification program and appraisal procedure, the high-speed data acquiring device with
Portable computer passes through wireless network communication.
A method of using the grounded screen health state evaluation system using linear discrete model parameter, including
Following steps：
Step 1, into substation, the ground state parameter testing point of the specific down conductor of selected grounding net of transformer substation is
It is step wave signal code input terminal, and by grounded screen catercorner length electric discharge pressure, testing current line, that is, arranges that test loop is used
Electric current pole and voltage pole；
Step 2, connect live step wave signal code generating means, arrange test data line, by input current signal and
Response output voltage signal is connected to high-speed data acquiring device；
Step 3, using linear discrete model parameter recognizer in portable computer to test input current and output
Voltage data carries out calculating analysis and processing, obtains three parameters i.e. equivalent resistance components R, the equivalent inductance component L of the model
With comprehensive parameters X；
Step 4, current data and historical data are changed value analysis, and according to relative change rate's numerical value area of setting
Ground connection Running State is assessed in domain, judges that the grounded screen is in health status, sub-health state still operating status in spite of illness.
Compared with prior art, the present invention has the following advantages：
1, the present invention provides one kind carrying out large area excavation to grounded screen, need not carry out Grounding and lead
Body samples and soil sample, greatly reduces the workload of grounding net of transformer substation corrosion sampling and measuring, significantly easy docking
A kind of advanced method that ground Running State is assessed.
2, the present invention provides a kind of grounding net of transformer substation equivalent linear discrete models, can be based on input and output signal
Data are identified its model parameter to calculate and analyze, to assess ground connection Running State based on parameter variation value.
3, the present invention provides a kind of ground state measurement method that can represent grounded screen different location down conductor,
Than the true operating status that traditional power-frequency earthing impedance is better able to reflection grounded screen.
4, the present invention provides one kind not to be limited by live service condition, is measured using the current signal of certain amplitude, can
It is carried out in the case where not having a power failure, and is full frequency band driving source, do not interfered by substation's power frequency electromagnetic field.
Description of the drawings
Fig. 1 is the system module structural schematic diagram of the present invention；
Fig. 2 is the equivalent linear discrete model of the grounding net of transformer substation of the present invention output and input；
Fig. 3 is the step wave current signal waveform exemplary plot of the injection grounded screen of the present invention；
Fig. 4 is the method applicating flow chart of the present invention；
Fig. 5 is that the system for field of the present invention tests wiring diagram.
Specific implementation mode
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is a part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work should all belong to the model that the present invention protects
It encloses.
The present invention tries hard to, from practical application, the shortcoming of customer service prior art, propose a kind of using linear discrete
The grounding net of transformer substation health state evaluation method of model parameter, can be the case where not having a power failure and not excavated to grounding net of transformer substation
Under, it measures directive/guide according to live country and professional standard earthing or grounding means characterisitic parameter and arranges electric loop, be based on down conductor
It tests the input current obtained and output voltage signal data and parameter identification is carried out to grounded screen equivalent linear discrete model, pass through
Compare the actual motion shape that the relative changing value between historical models parameter and current measured data calculating parameter understands grounded screen
State, judges whether grounded screen occurs corrosion or conductor break, and to its operating status, whether " health " judges, to ensure electricity
The safe and reliable operation of Force system.The test method meets intelligent measurement in the existing intelligence fortune inspection System Construction carried out energetically
Technology growth requirement has many advantages, such as simple, accurate and is not limited by live service condition.
The technical issues of solved through the invention, is to provide a kind of substation using linear discrete model parameter and connects
It is electrical to measure directive/guide arrangement according to live country and professional standard earthing or grounding means characterisitic parameter for earth mat health state evaluation method
Circuit, use site step wave signal code generator export certain amplitude current test signal (>10A is typically chosen
20A), it is applied on evaluated grounding net of transformer substation down conductor, measures the test letter for being selected input grounding downlead
The response of number electric current (logical Regular History Frequency Rogowski coil is converted to voltage signal) and the synchronous recording selected down conductor is defeated
Go out voltage signal, using linear discrete model parameter recognizer in portable computer to test input current and output voltage
Data carry out calculating analysis and processing, obtain grounded screen equivalent linear discrete model two parameters i.e. equivalent resistance components R and
Equivalent inductance component L, and the grounding net of transformer substation same position down conductor analyzed with history survey calculation etc.
Effect resistive component and equivalent inductance component carry out analysis comparison, based on relative variation come to assess the grounding net of transformer substation be to be in
Health, inferior health still operating status in spite of illness.
The concrete outcome of the present invention can refer to attached drawing, and Fig. 1 is that a preferred embodiment of the present invention is joined using linear discrete model
Several grounding net of transformer substation health state evaluation method main modular block diagram, as shown in Figure 1, the grounding net of transformer substation corrodes shape
State appraisal procedure includes at least：The step current signal source module 1 of Parameter adjustable, grounded screen module 2, input current and response are defeated
Go out voltage waveform acquisition and memory module 3, linear discrete model and parameters identification module 4 and grounded screen health state evaluation module 5.
The step current signal source module 1 of the Parameter adjustable generates unlike signal electric current and is infused in grounded screen module 2
On, the step current of the input current and response the output voltage waveforms acquisition of acquisition memory module 3 and storage Parameter adjustable
The response output voltage signal wave for 2 down conductor of input current signal waveform and grounded screen module that signal source module 1 generates
Shape, the linear discrete model and parameters identification module 4 carry input current and response output voltage waveforms acquisition memory module 3
The electric current and voltage waveform data of confession are handled, obtain the grounded screen by linear discrete model and parameters identification calculate analysis etc.
Resistive component R, equivalent inductance component L and comprehensive parameters X are imitated, grounded screen health state evaluation module 5, the ground connection are stored in
Net health state evaluation module 5 utilizes current data and historical data, value analysis is changed, to assess the substation grounding
The operating status of net.
The present invention provides a kind of grounding net of transformer substation health state evaluation method using linear discrete model parameter,
In Fig. 2 is shown in based on the grounding net of transformer substation equivalent linear discrete model output and input.Live step wave current signal generator
The step signal wave current of certain amplitude is generated, as shown in figure 3, the online input grounding downlead of substation grounding is acted on,
And the response voltage waveform of write input current waveform and response output down conductor, utilize portable computer center line
Property discrete model parameter recognizer data output and input to test carry out calculating analysis and processing, obtain two of the model
Parameter, that is, equivalent resistance components R, equivalent inductance component L and comprehensive parameters X eliminate impedance value ratio under current single-frequency 50Hz
The uncertainty relatively brought, it can be found that grounding grids cause entirely to be grounded what Running State occurred due to corroding or being broken
Variation is in health status, sub-health state still operating status in spite of illness.
The present invention provides one kind carrying out large area excavation to grounded screen, need not carry out Grounding conductor
Sampling and soil sample, greatly reduce the workload of grounding net of transformer substation corrosion sampling and measuring, significantly easy to ground connection
A kind of advanced method that Running State is assessed.
The present invention provides a kind of grounding net of transformer substation equivalent linear discrete models, can be based on input and output signal number
It is analyzed according to being identified to calculate to its model parameter, to assess ground connection Running State based on parameter variation value.
The present invention provides a kind of ground state measurement method that can represent grounded screen different location down conductor, than
Traditional power-frequency earthing impedance is better able to the true operating status of reflection grounded screen.
The present invention provides one kind limit by live service condition, can be using the current signal measurement of certain amplitude
Do not have a power failure lower progress, and is full frequency band driving source, is not interfered by substation's power frequency electromagnetic field.
The above-mentioned technical problem of the present invention is mainly being addressed by the following technical programs：
As shown in figure 4, a kind of grounding net of transformer substation health state evaluation method using linear discrete model parameter, special
Sign is, includes the following steps：
Step 1, into substation, the specific down conductor of selected grounding net of transformer substation (being typically at main transformer ground connection) connects
Ground state parameter test point is step wave signal code input terminal, and is put by grounded screen catercorner length according to standard or directive/guide
Voltage, testing current line arrange test loop electric current pole and voltage pole；
Step 2, connect live step wave signal code generating means, arrange test data line, by input current signal and
Response output voltage signal is connected to high-speed data acquiring device；
Step 3, using linear discrete model parameter recognizer in portable computer to test input current and output
Voltage data carries out calculating analysis and processing, obtains two parameters i.e. equivalent resistance components R, the equivalent inductance component L of the model
With comprehensive parameters X；
Step 4, current data and historical data are changed value analysis, and according to relative change rate's numerical value area of setting
Ground connection Running State is assessed in domain, judges that the grounded screen is in health status, sub-health state still operating status in spite of illness.
As shown in figure 5, into 220kV substations, selectes substation 1# main transformer earthing bars and surveyed for Grounding parameter
Pilot, that is, step wave signal code input terminal connects according to grounded screen catercorner length 200m according to professional standard DL/T475-2006
Ground equipment energy characteristic parameter measurement directive/guide electric discharge pressure p-wire 800m, testing current line 600m, and arrange electric current pole and voltage pole.Even
It connects one step current waveform of live step wave generator output and (voltage is also converted by Rogowski coil as input signal
Waveform), while the response of the down conductor is output voltage signal, two paths of signals data access high-speed data acquiring device
(sample rate is set as 500MS/s).High-speed data acquiring device uses wireless network communication with portable computer, carries out parameter
If fixed sum data transmits.Using linear discrete model parameter recognizer in portable computer to test input current and output
Voltage data carries out calculating analysis and processing, obtains two parameters i.e. equivalent resistance components R, the equivalent inductance component L of the model
With comprehensive parameters X.Finally, current data and historical data are changed value analysis, and according to relative change rate's number of setting
Ground connection Running State is assessed in value region, judges that the grounded screen is in health status, sub-health state still runs shape in spite of illness
State.
Wherein, linear discrete model, model and parameters identification and the status assessment calculating of input/output procedure define such as respectively
Under.
(1), as shown in Fig. 2, linear discrete model：
Process noise is represented with e (k), that is, acts on the random disturbances of model itself, due to its presence, the model made is defeated
Output y (k) becomes：
Wherein, u (k) is the certainty input quantity of model；a1For equivalent resistance components R to be identified；b1It is to be identified etc.
Imitate inductive component L；b0For comprehensive parameters X to be identified.
If the noise of input quantity is denoted as s (k), the measured value of input quantity is denoted as x (k), then has：
X (k)=u (k)+s (k)
In addition, outlet side measurement noise ω (k) is superimposed upon the measured value for becoming output quantity on y (k), it is denoted as z (k)：
Z (k)=y (k)+ω (k)
According to above-mentioned, it is not difficult to write out the model of calculating,
At this point, input quantity x (k) and output quantity z (k) are measured values.
(2), model and parameters identification：
Model and parameters identification contacts fraction according to the difference between computer and process model at present can be divided into offline knowledge
Other and two kinds of situations of online recognition.As shown in figure 5, the present invention uses identified off-line mode, i.e., collected data are stored in
In hard disk, data are subjected to batch processing.
As shown in Fig. 2, grounding net of transformer substation discrete linear model can use step response method, impulse response method and frequency
Response method, but in view of there is certain noise factor when in-site measurement, the present invention is using relevant function method to three etc. of model
Effect parameter carries out calculating solution.
(3), health state evaluation：
By taking comprehensive parameters X as an example, parameter current X and history parameters X' relative change rates calculating are as follows：
For the relative change rate of equivalent comprehensive parameters；
Then,
For the relative change rate of equivalent resistance component；
For the relative change rate of equivalent inductance component.
According to relative change rate's numberical range of above three parameter, assessment rule as shown in Table 1 is established, in table,
I --- numerical value≤10%；II --- 10% ＜ numerical value≤50%；III --- numerical value ＞ 50%；JK --- health status；
YJK --- sub-health state；DB --- operating status in spite of illness.
Table 1
The operation principle of the present invention：
The present invention provides a kind of grounding net of transformer substation health state evaluation method using linear discrete model parameter,
In Fig. 2 is shown in based on the grounding net of transformer substation equivalent linear discrete model output and input.Live step wave current signal generator
The step signal wave current of certain amplitude is generated, as shown in figure 3, the online input grounding downlead of substation grounding is acted on,
And the response voltage waveform of write input current waveform and response output down conductor, utilize portable computer center line
Property discrete model parameter recognizer data output and input to test carry out calculating analysis and processing, obtain three of the model
Parameter, that is, equivalent resistance components R, equivalent inductance component L and comprehensive parameters X eliminate impedance value ratio under current single-frequency 50Hz
The uncertainty relatively brought, it can be found that grounding grids cause entirely to be grounded what Running State occurred due to corroding or being broken
Variation is in health status, sub-health state still operating status in spite of illness.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain subject to.
Claims (10)
1. a kind of grounded screen health state evaluation system using linear discrete model parameter, which is characterized in that the system includes
Step current signal source module (1), grounded screen module (2), input current and the response output voltage waveforms acquisition of Parameter adjustable
Memory module (3), linear discrete model and parameters identification module (4) and grounded screen health state evaluation module (5)；
The step current signal source module (1) of the Parameter adjustable generates unlike signal electric current and is infused in grounded screen module (2)
On, the step electricity of the input current and response output voltage waveforms acquisition memory module (3) acquisition and storage Parameter adjustable
Flow the response output voltage of input current signal waveform and grounded screen module (2) down conductor that signal source module (1) generates
Signal waveform, the linear discrete model and parameters identification module (4) deposit input current and response output voltage waveforms acquisition
The electric current and voltage waveform data that storage module (3) provides are handled, and obtain the grounded screen by linear discrete model and parameters identification
Equivalent resistance components R, equivalent inductance component L and the comprehensive parameters X for calculating analysis, are stored in grounded screen health state evaluation module
(5), the grounded screen health state evaluation module (5) utilizes current data and historical data, is changed value analysis, to
Assess the operating status of the grounding net of transformer substation.
2. system according to claim 1, it is characterised in that：In the linear discrete model and parameters identification module (4)
Linear discrete model be defined as：
Process noise is represented with e (k), is used for the random disturbances of model itself, due to its presence, the model output y (k) that makes
Become：
Wherein, u (k) is the certainty input quantity of model；a1For equivalent resistance components R to be identified；b1For equivalent electricity to be identified
Feel component L；b0For comprehensive parameters X to be identified；
If the noise of input quantity is denoted as s (k), the measured value of input quantity is denoted as x (k), then has：
X (k)=u (k)+s (k)
In addition, outlet side measurement noise ω (k) is superimposed upon the measured value for becoming output quantity on y (k), it is denoted as z (k)：
Z (k)=y (k)+ω (k)
According to above-mentioned, the model of calculating is obtained：
At this point, input quantity x (k) and output quantity z (k) are measured values.
3. system according to claim 1, it is characterised in that：The model and parameters identification uses identified off-line mode,
I.e. in a hard disk by the storage of collected data, data are subjected to batch processing.
4. system according to claim 1, it is characterised in that：The model and parameters identification method includes correlation analysis
Method, step response method, impulse response method and frequency response method.
5. system according to claim 4, it is characterised in that：When using relevant function method, data are not required to carry out denoising
Processing；When using step response method, impulse response method and frequency response method, data need to first carry out denoising.
6. system according to claim 1, it is characterised in that：The health state evaluation is defined as：
Parameter current X and history parameters X' relative change rates calculate as follows：
For the relative change rate of equivalent comprehensive parameters；
Then,
For the relative change rate of equivalent resistance component；
For the relative change rate of equivalent inductance component；
According to above three relative change rate's numberical range, following assessment rule is established：When two of which, relative change rate is equal
When being I grades, grounding net of transformer substation health state evaluation is JK；When one is I grades in two of which relative change rate, one is II
When grade, grounding net of transformer substation health state evaluation is YJK；In the case of remaining, grounding net of transformer substation health state evaluation is DB；
Defined in it：I grades are BHL≤10%, and II grades are 10% ＜ BHL≤50%, and III level is BHL ＞ 50%, and JK is healthy shape
State, YJK are sub-health state, and DB is operating status in spite of illness.
7. system according to claim 5, it is characterised in that：Three category level I, II and III relative change rate BHL's
The alterable setting of numberical range.
8. system according to claim 1, it is characterised in that：The step current signal source module of the Parameter adjustable
(1) it is step wave current signal generator；
The response output voltage waveforms acquisition memory module (3) is high-speed data acquiring device.
9. system according to claim 8, it is characterised in that：The linear discrete model and parameters identification module (4) and
Grounded screen health state evaluation module (5) is respectively be mounted with linear discrete model and parameters identification program and appraisal procedure portable
Formula computer, the high-speed data acquiring device pass through wireless network communication with portable computer.
10. a kind of using the grounded screen health state evaluation system described in claim 1 using linear discrete model parameter
Method, which is characterized in that include the following steps：
Step 1, into substation, the ground state parameter testing point for selecting the specific down conductor of grounding net of transformer substation is rank
Jump wave signal code input terminal, and by grounded screen catercorner length electric discharge pressure, testing current line, that is, arranges test loop electric current
Pole and voltage pole；
Step 2, live step wave signal code generating means is connected, test data line is arranged, by input current signal and response
Output voltage signal is connected to high-speed data acquiring device；
Step 3, using linear discrete model parameter recognizer in portable computer to test input current and output voltage
Data carry out calculating analysis and processing, obtain the three parameters i.e. equivalent resistance components R of the model, equivalent inductance component L and comprehensive
Close parameter X；
Step 4, current data and historical data, be changed value analysis, and according to relative change rate's value region of setting come
Assessment ground connection Running State judges that the grounded screen is in health status, sub-health state still operating status in spite of illness.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444555A (en) * | 2018-12-24 | 2019-03-08 | 国网河北省电力有限公司沧州供电分公司 | A kind of grounded screen impedance frequency conversion detection method and device |
| CN112415334A (en) * | 2020-11-16 | 2021-02-26 | 国网上海市电力公司 | Digital twin system of all-in-one station grounding system and modeling method |
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| CN101315403A (en) * | 2007-05-29 | 2008-12-03 | 华北电力科学研究院有限责任公司 | Ground net corrosion detection method and system |
| CN102495291A (en) * | 2011-12-13 | 2012-06-13 | 武汉大学 | Impedance frequency response method for measuring corrosion state of grounding network of transformer substation |
| CN103439631A (en) * | 2013-08-12 | 2013-12-11 | 国家电网公司 | Method and system for detecting corrosion state of grounding grid |
| CN104678246A (en) * | 2015-02-03 | 2015-06-03 | 国网上海市电力公司 | Method and system for evaluating corrosion state of transformer substation grounding grid |
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