CN104833898B - Using the grounding net of transformer substation etch state appraisal procedure of M sequence signal code - Google Patents

Using the grounding net of transformer substation etch state appraisal procedure of M sequence signal code Download PDF

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CN104833898B
CN104833898B CN201510225437.XA CN201510225437A CN104833898B CN 104833898 B CN104833898 B CN 104833898B CN 201510225437 A CN201510225437 A CN 201510225437A CN 104833898 B CN104833898 B CN 104833898B
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mrow
munderover
mfrac
msub
signal code
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CN104833898A (en
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司文荣
傅晨钊
林一
祝达康
黄华
杨凌辉
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Shanghai Energy Saving Service Co., Ltd.
State Grid Shanghai Electric Power Co Ltd
East China Power Test and Research Institute Co Ltd
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Shanghai Energy Saving Service Co Ltd
State Grid Shanghai Electric Power Co Ltd
East China Power Test and Research Institute Co Ltd
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Abstract

The present invention relates to a kind of grounding net of transformer substation etch state appraisal procedure of use M sequence signal code, including:1) produce live M sequence signal code and act on the online input grounding downlead of substation grounding;2) the response voltage waveform of the output down conductor of collection site is produced live M sequence current waveform signal, the response voltage waveform of input grounding downlead and diverse location;3) electric current of voltage logging modle offer is provided to down conductor and voltage waveform data progress handles the ground state parameter and identification process curve for obtaining grounded screen diverse location down conductor;4) current data and historical data are utilized, the ground state parameter to grounded screen diverse location down conductor carries out trend analysis and identification process curve carries out correlation analysis, so as to assess the etch state of the grounding net of transformer substation.Compared with prior art, the present invention has the advantages that simply, accurately and not by live service condition to be limited.

Description

Using the grounding net of transformer substation etch state appraisal procedure of M sequence signal code
Technical field
The present invention relates to a kind of grounding net of transformer substation etch state appraisal procedure, more particularly, to one kind using M sequence letter The grounding net of transformer substation etch state appraisal procedure of number electric current.
Background technology
Grounding net of transformer substation is to ensure that electrical equipment and the critical facility of personal safety.Because grounded screen is embedded in underground, The often corrosion because of soil for many years, causes grounding body to attenuate or even be broken, makes Grounding performance depreciation.At present, it is right in engineering The detection of Grounding performance quality is typically judged, but can not understand the corrosion of grounded screen indirectly by power frequency earthing resistance Situation.Because as long as open circuit does not occur for the grounding body of measured place, even if grounded screen is by heavy corrosion, power frequency earthing resistance is generally also Regulatory requirements can be reached.So being typically all to find that earth mat power frequency earthing resistance is unqualified or occurring because earth mat lacks in engineering After accident caused by falling into, excavated by large area and search grounded screen breakpoint and corrosion section, this method of work carries blindness, work Work amount is very big.
In addition, the obtained impedance ground value of power frequency earthing resistance test conventional at present is for 50Hz or close to the work under 50Hz Frequency impedance ground value, but occur actually in transformer station under short circuit grounding failure, or Lightning Incoming Wave or operation ripple effect, connect The transient state Transient grounding resistance of earth mat plays a decisive role.Therefore only measurement power-frequency earthing impedance can not represent grounding net of transformer substation Can be with safe operation under fault condition.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind uses M sequence signal The grounding net of transformer substation etch state appraisal procedure of electric current, i.e., export certain amplitude using live M sequence signal code generator M sequence signal code (>10A, is typically chosen 20A), put on evaluated grounding net of transformer substation down conductor, measure The M sequence current waveform signal (being converted to voltage waveform with current divider) of chosen input grounding downlead, and it is chosen defeated Enter the response voltage waveform with different outgoing position down conductors, connect using least square recurrence method in portable computer Ground state parameter is calculated and identification process data curve drawing software is handled not M sequence signal code and each voltage data With the ground state parameter and identification process curve of position down conductor, and it is same with the grounding net of transformer substation that measures over the years Position down conductor ground state parameter carries out trend analysis and identification process curve carries out correlation analysis, so as to assess The etch state of the grounding net of transformer substation.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of grounding net of transformer substation etch state appraisal procedure of use M sequence signal code, it is characterised in that including with Lower step:
1) live M sequence signal code occurs module and produces live M sequence signal code to act on substation grounding online Input grounding downlead;
2) the live M that module is produced occurs for down conductor response voltage logging modle collection site M sequence signal code The sound of the output down conductor of sequence signal current waveform, the response voltage waveform of input grounding downlead and diverse location Answer voltage waveform;
3) Least Square Recurrence ground state parameter is calculated and identification process Drawing of Curve module is responded to down conductor The electric current and voltage waveform data progress that voltage logging modle is provided handle and obtain connecing for grounded screen diverse location down conductor Ground state parameter and identification process curve, and it is stored in test result storage and logging modle;
4) grounded screen state estimation and analysis module are calculated and identification process using Least Square Recurrence ground state parameter Current data and the test result storage of Drawing of Curve module and the historical data of logging modle, are grounded to grounded screen diverse location The ground state parameter of downlead carries out trend analysis and identification process curve carries out correlation analysis, so as to assess the power transformation The etch state for grounded screen of standing.
Described M sequence signal code adds XOR feedback logic railway superstructures by the linear shift register of n grades of concatenations.
Least Square Recurrence ground state parameter θ=[R, L, X]T, wherein R is that impedance ground resistive component, L are ground connection resistance Anti- perceptual weight, X are grounded screen coefficient in good condition.
Described process identification curve Δ;
Described current curves x and history curve y coefficient RsxyIt is calculated as follows:
The standard variance of two sequences is calculated,
The covariance of two sequences is calculated,
The normalized covariance coefficient of two sequences is calculated,
The coefficient R for meeting requirement of engineering is calculated according to following companyxy,
Compared with prior art, the present invention can understand the fortune of grounded screen in the case where not having a power failure and earth mat not being excavated Row state, judges whether grounded screen corrodes, and ensures the safe and reliable operation of power system;And with simply, accurately and not The advantages of being limited by live service condition.
Brief description of the drawings
Fig. 1 is functional block diagram of the invention;
Fig. 2 is flow chart of the invention;
Fig. 3 is on-the-spot test wiring diagram of the invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The concrete outcome of the present invention can refer to accompanying drawing, and Fig. 1 is a preferred embodiment of the present invention based on M sequence signal code Grounding net of transformer substation etch state appraisal procedure main modular block diagram, as shown in figure 1, the grounding net of transformer substation corrode shape State appraisal procedure at least includes:Live M sequence signal code occur module 10, down conductor response voltage logging modle 11, Least Square Recurrence ground state parameter is calculated and identification process Drawing of Curve module 12, test result storage and record (history Data query) module 13, grounded screen state estimation and analysis module 14.Connecting relation between module:Live M sequence signal code Generation module 10 produces live M sequence signal code and acted under the online input grounding downlead of substation grounding, grounding lead The live M sequence signal code ripple that module 10 is produced occurs for the collection site M sequence signal code of line response voltage logging modle 11 The response voltage waveform of the output down conductor of shape, the response voltage waveform of input grounding downlead and diverse location, most A young waiter in a wineshop or an inn multiplies recursion ground state parameter and calculated with identification process Drawing of Curve module 12 to down conductor response voltage record mould The electric current and voltage waveform data progress that block 11 is provided handle the ground state ginseng for obtaining grounded screen diverse location down conductor Number and identification process curve, are as a result stored in test result storage and record (the inquiry of historical data) module 13, grounded screen state Assess and analysis module 14 is calculated using Least Square Recurrence ground state parameter and identification process Drawing of Curve module 12 is worked as Preceding data and test result storage and the historical data of record (the inquiry of historical data) module 13, are grounded to grounded screen diverse location The ground state parameter of downlead carries out trend analysis and identification process curve carries out correlation analysis, so as to assess the power transformation The etch state for grounded screen of standing.
The invention provides the M sequence signal code work that a kind of live M sequence signal code generator produces certain amplitude Used in the online input grounding downlead of substation grounding, and record input M sequence current waveform signal and input, output ground connection The response voltage waveform of downlead, is carried out data processing and is calculated to analyze, obtain the different positions of grounded screen using Least Square Recurrence The ground state parameter and identification process curve of down conductor are put, passes through the trend analysis of current and history ground state parameter Contrast between curve, eliminates the uncertainty that impedance value under single-frequency is relatively brought, it can be found that grounding grids Because corrosion or fracture cause the change that whole grounded screen state occurs.
Large area excavation need not be carried out to grounded screen, it is not necessary to carry out Grounding conductor the invention provides one kind Sampling and soil sample, greatly reduce the workload that grounding net of transformer substation corrodes sampling and measuring, significantly easy to ground connection A kind of advanced method that net etch state is estimated.
The ground state parameter measurement side of grounded screen diverse location down conductor can be represented the invention provides a kind of Method, is better able to reflect the true running status of grounded screen than traditional power-frequency earthing impedance.
The invention provides one kind while measurement is selected as input end grounding and draws lower ground state parameter, moreover it is possible to The ground state parameter as output head grounding net diverse location down conductor is obtained, is not limited, made by live service condition It with electric signal measurement, can be carried out in the case where not having a power failure, and be full rate driving source, not disturbed by transformer station'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 Fig. 2 a kind of grounding net of transformer substation etch state appraisal procedure of use M sequence, it is characterised in that including Following steps:
Step 1, into transformer station, the ground state parameter testing point of the specific down conductor of selected grounding net of transformer substation is It is M sequence signal code input, and according to grounded screen catercorner length electric discharge pressure, testing current line;
Step 2, live M sequence signal code generating means is connected, the selection other diverse locations of grounded screen are representative Down conductor be voltage responsive output end, and voltage, current waveform recorder are connected to, according to transformer station's scale selection weight Down conductor is wanted, quantity can be 2~3;
Step 3, calculated using Least Square Recurrence ground state parameter in portable computer and identification process curve is painted Software processed is to test record and is calculated and is analyzed, drawing process identification curve, obtains under grounded screen diverse location grounding lead The ground state parameter and identification process curve of line;
Step 4, compare and analyze, check that the grounded screen same position ground state parameter of history measurement and identification response are bent Line, trend analysis is carried out to ground connection state parameter and identification response curve carries out correlation analysis;
Step 5, according to the phase relation of current ground state parameter value variation and current identification process curve and history curve Number size assesses ground net corrosion state.
Field conduct case explanation
As shown in figure 3, into a 35kV transformer stations, selecting transformer station 2# main transformers earthing bar and being surveyed for Grounding parameter Pilot is M sequence signal code input G, and voltage tester is put according to DL/T475-2006 according to grounded screen catercorner length 20m Line 80m, testing current line 100m.Connection live M sequence signal code generator (outputting standard M sequence current waveform signal, peak Value 20A), selection outlet switch arrester A, enclosure wall corner B down conductors are connected to as grounded screen shock response output end Multichannel voltage, current waveform recorder (sample rate is set to 500MS/s).Test record is simultaneously calculated and analyzed, and is drawn Identification process curve, the ground state parameter and identification process for obtaining grounded screen diverse location down conductor (A, B and G) is bent Line;It can be assessed according to the coefficient correlation size of current ground state Parameters variation and current identification process curve and history curve Ground net corrosion state.
Wherein, M sequence signal code, Least Square Recurrence ground state parameter, identification process curve and the correlation utilized Coefficient is calculated and is defined as below respectively.
(1) M sequence signal code
M sequence is also known as pseudo-order, can add XOR feedback logic railway superstructures by the linear shift register of n grades of concatenations. The linear feedback logical expression generally formed is:
In formula:X power represents element correspondence position.F (x) is referred to as the proper polynomial of linear feedback shift register, There are close ties in the cycle of proper polynomial and list entries.
(2) Least Square Recurrence ground state parameter θ=[R, L, X]T, R is that impedance ground resistive component, L are ground connection resistance Anti- perceptual weight, X are grounded screen coefficient in good condition:
Y (k)=ΦT(k)θ+ξ(k)
In formula:Y (k) is response voltage waveform sequence;Φ (k) is the M sequence current waveform signal of input;Kk+1For gain Matrix;PkFor covariance, its initial value is P0=10βI, wherein I are unit matrix, and β typically takes larger positive integer;It is given to estimate Initial parameter values are counted, the value of very little is taken,λ is forgetting factor (0 < λ≤1), makes old number Gradually fallen according to by exponential damping law by " forgetting ", so that the effect of prominent new data, efficiently against least square method of recursion " data saturation " phenomenon.
(3) process identification curve Δ:
(4) current curves x and history curve y coefficient RsxyIt is calculated as follows:
The standard variance of two sequences is calculated,
The covariance of two sequences is calculated,
The normalized covariance coefficient of two sequences is calculated,
The coefficient R for meeting requirement of engineering is calculated according to following companyxy,
Module and the 2) selection of voltage responsive output head grounding downlead, two are occurred with regard to 1) live M sequence signal code Link does following explanation:
1) module occurs for live M sequence signal code
The present invention based on M sequence signal code occur module, it is recommended to use the current wave to be formed is programmed based on multinomial, But can also white noise form current wave, in addition peak value size can also change.
2) selection of voltage responsive output head grounding downlead
The selection position of the voltage responsive output head grounding downlead of foregoing description can change, and choose number and also may be used To change.

Claims (4)

1. the grounding net of transformer substation etch state appraisal procedure of a kind of use M sequence signal code, it is characterised in that including following Step:
1) module occur for live M sequence signal code produce live M sequence signal code to act on online defeated of substation grounding Enter down conductor;
2) the live M sequence that module is produced occurs for down conductor response voltage logging modle collection site M sequence signal code The response electricity of the output down conductor of current waveform signal, the response voltage waveform of input grounding downlead and diverse location Corrugating;
3) Least Square Recurrence ground state parameter is calculated and identification process Drawing of Curve module responds voltage to down conductor The electric current and voltage waveform data progress that logging modle is provided handle the ground connection shape for obtaining grounded screen diverse location down conductor State parameter and identification process curve, and it is stored in test result storage and logging modle;
4) grounded screen state estimation and analysis module are calculated and identification process curve using Least Square Recurrence ground state parameter Current data and the test result storage of drafting module and the historical data of logging modle, under grounded screen diverse location grounding lead The ground state parameter of line carries out trend analysis and identification process curve carries out correlation analysis, is connect so as to assess the transformer station The etch state of earth mat;
Least Square Recurrence ground state parameter θ=[R, L, X]T, wherein R is that impedance ground resistive component, L are impedance ground sense Property component, X be grounded screen coefficient in good condition.
2. a kind of grounding net of transformer substation etch state appraisal procedure of use M sequence signal code according to claim 1, Characterized in that, described M sequence signal code adds XOR feedback logic circuit structure by the linear shift register of n grades of concatenations Into.
3. a kind of grounding net of transformer substation etch state appraisal procedure of use M sequence signal code according to claim 1, Characterized in that, described process identification curve Δ;
<mrow> <mi>&amp;Delta;</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mover> <mi>&amp;theta;</mi> <mo>^</mo> </mover> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>-</mo> <mover> <mi>&amp;theta;</mi> <mo>^</mo> </mover> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
4. a kind of grounding net of transformer substation etch state appraisal procedure of use M sequence signal code according to claim 1, Characterized in that, current curves x and history curve y coefficient RsxyIt is calculated as follows:
The standard variance of two sequences is calculated,
<mrow> <msub> <mi>D</mi> <mi>x</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mrow> <mo>&amp;lsqb;</mo> <mi>X</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>X</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> <mn>2</mn> </msup> <mo>,</mo> <msub> <mi>D</mi> <mi>y</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msup> <mrow> <mo>&amp;lsqb;</mo> <mi>Y</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>Y</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> <mn>2</mn> </msup> </mrow>
The covariance of two sequences is calculated,
<mrow> <msub> <mi>C</mi> <mrow> <mi>x</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mo>&amp;lsqb;</mo> <mi>X</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>X</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> <mo>&amp;times;</mo> <mo>&amp;lsqb;</mo> <mi>Y</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>Y</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow>
The normalized covariance coefficient of two sequences is calculated,
<mrow> <msub> <mi>LR</mi> <mrow> <mi>x</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>C</mi> <mrow> <mi>x</mi> <mi>y</mi> </mrow> </msub> <mo>/</mo> <msqrt> <mrow> <msub> <mi>D</mi> <mi>x</mi> </msub> <msub> <mi>D</mi> <mi>y</mi> </msub> </mrow> </msqrt> </mrow>
The coefficient R for meeting requirement of engineering is calculated according to following companyxy,
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CN107271758A (en) * 2017-05-28 2017-10-20 西南交通大学 Thunderbolt shaft tower earth current evaluation system and method based on bipolar plate structure
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