CN102495291A - Impedance frequency response method for measuring corrosion state of grounding network of transformer substation - Google Patents
Impedance frequency response method for measuring corrosion state of grounding network of transformer substation Download PDFInfo
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- CN102495291A CN102495291A CN2011104141109A CN201110414110A CN102495291A CN 102495291 A CN102495291 A CN 102495291A CN 2011104141109 A CN2011104141109 A CN 2011104141109A CN 201110414110 A CN201110414110 A CN 201110414110A CN 102495291 A CN102495291 A CN 102495291A
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Abstract
The invention relates to an impedance frequency response method for measuring the corrosion state of a grounding network of a transformer substation. The method comprises the following steps of: 1, calculating impedance frequency response curves between grounding down leads at different positions and under different corrosion states of the grounding network of the transformer substation by numerical simulation and a corresponding frequency point impedance numerical list; 2, actually measuring and drawing the impedance frequency response curves at the different positions of the grounding network; 3, querying the impedance frequency response curve which is at the same position of the grounding network of the transformer substation and is measured every year; and 4, comparing original input data which are obtained in the step 1, the impedance frequency response curves which are at the different positions and are obtained in the step 2, and the impedance frequency response curve which is at the same position, is measured every year and is obtained in the step 3, estimating the corrosion states of the grounding network, and giving the corrosion level of the grounding network and the equivalent diameter of a grounding body. The method has the advantages that: excavation and soil sampling of the grounding network are not required; the working load of corrosion measurement of the grounding network of the transformer substation is reduced; the cycle of the corrosion measurement of the grounding network of the transformer substation is shortened; and the judgment accuracy of the corrosion level of the grounding network of the transformer substation is improved.
Description
Technical field
The present invention relates to a kind of ground net corrosion state measurement method, especially relate to a kind of grounding net of transformer substation etch state impedance frequency response measurement method.
Background technology
Grounding net of transformer substation be imbed in the earth and with the wire netting that the earth closely contacts, bearing is that fault current or lightning current are released fast the task into ground passage, protection personal safety and electrical equipment safety is provided.Because the earth conductor cross section that causes of ground net corrosion diminishes, loose contact, grounded screen life-span shorten, earth mat is transformed in advance, blindly problems such as selection all exist in various places in various degree, the assessment of ground net corrosion state at present more and more comes into one's own.
The assessment of the corrosion of grounding net of transformer substation in the past relies on measurement grounding resistance of transformer substation grounding net value to judge that indirectly the soil of getting grounded screen buried depth position carries out the corrosivity analysis usually, perhaps to grounded screen large tracts of land excavation back inspection ground net corrosion state.
Can't accurately judge the etch state of grounded screen according to the grounding resistance of transformer substation grounding net value, there are weak points such as the soil sample workload is big, the lab investigation analytical cycle is long in the soil corrosivity of analyzing grounded screen buried depth position.
Carry out grounded screen large tracts of land excavation gesture and have blindness; Workload is huge; But also need problem such as powers failure, have certain potential safety hazard simultaneously, therefore study a kind of novel, safe and reliable, workable, grounding net of transformer substation etch state measuring method is very urgently fast and accurately.
Summary of the invention
The present invention solves the existing in prior technology technical matters; Provide a kind of employing frequency sweep method to measure grounding net of transformer substation impedance frequency response curve; Through the contrast between the curve; Got rid of the uncertainty that the resistance value comparison is brought under the single-frequency (or direct current), found that dexterously the variation of corrosion grounding body impedance frequency characteristic can be used for the judgement and the judgement of grounding body equivalent diameter of etch state monitoring, diagnosing, grounding net of transformer substation corrosion class.
It is to solve the existing in prior technology technical matters that the present invention also has a purpose; Provide a kind of and need not carry out the large tracts of land excavation grounded screen; Need not carry out sampling of grounded screen earth conductor and soil sample; Significantly reduced the workload of grounding net of transformer substation corrosion sampling and measuring, and need not shorten a kind of grounding net of transformer substation etch state impedance frequency response measurement method in grounding net of transformer substation corrosion measurement cycle greatly earth conductor and the soil chamber test analysis that experimentizes.
It is to solve the existing in prior technology technical matters that the present invention has a purpose again; Provide a kind of when measuring grounded screen impedance frequency response curve; Not limited by on-the-spot service condition; Use electric signal measurement, can not carry out under the power-off condition, a kind of grounding net of transformer substation etch state impedance frequency response measurement method of the economic loss of having avoided transformer station to have a power failure being brought.
Above-mentioned technical matters of the present invention mainly is able to solve through following technical proposals:
A kind of grounding net of transformer substation etch state impedance frequency response measurement method is characterized in that, may further comprise the steps:
Step 1 is utilized numerical simulation to calculate impedance frequency response curve under the 0-10kHz frequency and respective frequencies point impedance number list between the grounding net of transformer substation diverse location down conductor is provided; And record original input data;
Step 2; Get into transformer station on the spot, selected measured zone is carried out the actual measurement of the response of the impedance frequency under the 0-10kHz frequency and respective frequencies point impedance numerical value between the grounded screen diverse location down conductor; The record measured result, and draw grounded screen diverse location impedance frequency response curve;
Step 3, inquiry this grounding net of transformer substation same position impedance frequency response curve of measuring over the years is inquired about the different etch state impedance frequency characteristic of this grounded screen curve;
Step 4; Etch state impedance frequency characteristic curve ratio is not with the grounded screen same position impedance frequency response curve of measuring over the years, this grounded screen in the diverse location impedance frequency response curve of the original input data of step 1, step 2 and the step 3; Assess the ground net corrosion state, provide the corrosion class and the grounding body equivalent diameter of grounded screen.
At above-mentioned a kind of grounding net of transformer substation etch state impedance frequency response measurement method, in the described step 2, the step of drawing grounded screen diverse location impedance frequency response curve is following:
Step 2.1, the AC measurment electric current of injection 0-10kHz different frequency between two down conductors of selected grounded screen;
Step 2.2; Voltage and current synchronization instantaneous value between two down conductors that measurement is selected under the AC measurment electric current of 0-10kHz different frequency; In this frequency range, choose and be no less than 15 Frequency points; Calculate the grounded screen resistance value of 0-10kHz different frequency between two down conductors, avoid the multiple frequency of power frequency 50Hz and power frequency when selecting Frequency point;
Step 2.3 changes substation grounding downlead position, selected again two down conductors in zone in addition, and repeating step 2.1 to 2.2;
Step 2.4 according to the measured result of step 2.1 to step 2.3, is drawn grounded screen diverse location impedance frequency response curve.
At above-mentioned a kind of grounding net of transformer substation etch state impedance frequency response measurement method; The different etch state impedance frequency characteristic of grounded screen curve in the described step 1; Numerical simulation is calculated provides different etch state impedance frequency response curves of grounded screen and respective frequencies point impedance number list, and having provided equivalent redius is 0-10kHz grounded screen resistance value and impedance frequency response curve under big or small, the different electric pressure of different test block transformer station between the different grounded screen materials of 6-20mm, the equidistant different earth grid of 5 * 5m to 12 * 12m and unequal-interval earth grid, two down conductors, the different test position situation of grounded screen.
At above-mentioned a kind of grounding net of transformer substation etch state impedance frequency response measurement method; In described step 2.1～step 2.4; Choose two down conductor positions based on as follows: be positioned at grounded screen middle part, grounded screen edge and grounded screen corner; Each transformer station's test position is no less than 2 places, survey frequency scope 0-10kHz, and what measure is impedance between the two selected down conductors of grounded screen.
At above-mentioned a kind of grounding net of transformer substation etch state impedance frequency response measurement method; In the described step 4; Measurement result and the original input data that calculates, the grounded screen same position impedance frequency response curve of measuring over the years are compared; Obtain equivalent redius after the corrosion of grounded screen earth conductor through interpolation and match, provide the corrosion class and the grounding body equivalent diameter of grounded screen according to earthing material corrosion class grade scale.
Therefore; The present invention has following advantage: adopt frequency sweep method 1.; Measure grounding net of transformer substation impedance frequency response curve; Through the contrast between the curve, got rid of the uncertainty that the resistance value comparison is brought under the single-frequency (or direct current), greatly improved the accuracy that grounding net of transformer substation corrosion class and grounding body equivalent diameter are judged; 2. need not carry out the large tracts of land excavation, significantly reduce the workload of grounding net of transformer substation corrosion measurement grounded screen; 3. use electric signal measurement need not carry out sampling of grounded screen earth conductor and soil sample, need not shorten the cycle of grounding net of transformer substation corrosion measurement greatly to earth conductor and the soil chamber test analysis that experimentizes; 4. when measuring grounded screen impedance frequency response curve, not limited by on-the-spot service condition, can not carry out under the power-off condition, the economic loss of having avoided transformer station to have a power failure and brought.
Description of drawings
Fig. 1 is a method flow diagram of the present invention.
Fig. 2 is a grounded screen impedance measurement synoptic diagram.
Fig. 3 is a grounded screen impedance frequency response curve.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment:
Grounding net of transformer substation etch state impedance frequency response measurement method may further comprise the steps:
Step 1, numerical simulation is calculated provides impedance frequency response curve under the 0-10kHz frequency and respective frequencies point impedance number list between the grounding net of transformer substation diverse location down conductor, as ground net corrosion state impedance frequency response original input data;
Different etch state impedance frequency response curves of the grounded screen that provides and respective frequencies point impedance number list are calculated in numerical simulation, and having provided equivalent redius is 0-10kHz grounded screen resistance value and impedance frequency response curve under big or small, the different electric pressure of different test block transformer station between the different grounded screen materials of 6-20mm, the equidistant different earth grid of 5 * 5m to 12 * 12m and unequal-interval earth grid, two down conductors, the different test position situation of grounded screen.
Steel earth conductor equivalent redius is respectively 8mm, 10mm, 12mm, 14mm, 16mm, and test zone is positioned at the grounded screen edge, and grounded screen is 5m * 5m isometric net, and when the test block size was 3 * 3 lattice, earth conductor normal impedance frequency response curve was seen Fig. 3.
Step 2, the AC measurment electric current of injection 0-10kHz different frequency between two down conductors of selected grounded screen;
During measurement, at first choose two ground connection drawing at the grounded screen edge and reach the standard grade, the test block size is 3 * 3 lattice, measures wiring by Fig. 2, injects the AC measurment electric current of 0-10kHz different frequency between reaching the standard grade in two ground connection drawing of grounded screen.
Step 3; Voltage and current synchronization instantaneous value between two down conductors that measurement is selected under the AC measurment electric current of 0-10kHz different frequency; In this frequency range, choose and be no less than 15 Frequency points, avoid the multiple frequency of power frequency 50Hz and power frequency when selecting Frequency point.Calculate the grounded screen resistance value of 0-10kHz different frequency between two down conductors, its Computer Corp. is following:
In the formula:
Z----two ground connection drawing reach the standard grade between the impedance of earth conductor under survey frequency, Ω;
UThe voltage of----two ground connection drawing between reaching the standard grade, V;
I----injection current, A;
Step 4 changes substation grounding downlead position, selected again two down conductors in zone in addition, repeating step 2, step 3;
Step 5; According to measured result; Draw grounded screen diverse location impedance frequency response curve; And calculating the original input data provide, the grounded screen same position impedance frequency response curve of measuring over the years relatively with numerical simulation, assessment ground net corrosion state provides the corrosion class and the grounding body equivalent diameter of grounded screen.
Specific embodiment described herein only is illustrating the inventive method.Person of ordinary skill in the field of the present invention can make an amendment or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from method of the present invention or surmount the defined scope of appended claims.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (5)
1. a grounding net of transformer substation etch state impedance frequency response measurement method is characterized in that, may further comprise the steps:
Step 1 is utilized numerical simulation to calculate impedance frequency response curve under the 0-10kHz frequency and respective frequencies point impedance number list between grounding net of transformer substation diverse location, the different etch state down conductor is provided; The record original input data;
Step 2; Get into transformer station on the spot, selected measured zone is carried out the actual measurement of the response of the impedance frequency under the 0-10kHz frequency and respective frequencies point impedance numerical value between the grounded screen diverse location down conductor; The record measured result, and draw grounded screen diverse location impedance frequency response curve;
Step 3, inquiry this grounding net of transformer substation same position impedance frequency response curve of measuring over the years; Inquire about the different etch state impedance frequency characteristic of this grounded screen curve;
Step 4; Etch state impedance frequency characteristic curve ratio is not with the grounded screen same position impedance frequency response curve of measuring over the years, this grounded screen in the diverse location impedance frequency response curve of the original input data of step 1, step 2 and the step 3; Assess the ground net corrosion state, provide the corrosion class and the grounding body equivalent diameter of grounded screen.
2. a kind of grounding net of transformer substation etch state impedance frequency response measurement method according to claim 1 is characterized in that, in the described step 2, the step of drawing grounded screen diverse location impedance frequency response curve is following:
Step 2.1, the AC measurment electric current of injection 0-10kHz different frequency between two down conductors of selected grounded screen;
Step 2.2; Voltage and current synchronization instantaneous value between two down conductors that measurement is selected under the AC measurment electric current of 0-10kHz different frequency; In this frequency range, choose and be no less than 15 Frequency points; Calculate the grounded screen resistance value of 0-10kHz different frequency between two down conductors, avoid the multiple frequency of power frequency 50Hz and power frequency when selecting Frequency point;
Step 2.3 changes substation grounding downlead position, selected again two down conductors in zone in addition, and repeating step 2.1 to 2.2;
Step 2.4 according to the measured result of step 2.1 to step 2.3, is drawn grounded screen diverse location impedance frequency response curve.
3. a kind of grounding net of transformer substation etch state impedance frequency response measurement method according to claim 1; It is characterized in that; The different etch state impedance frequency characteristic of grounded screen curve in the described step 1; Numerical simulation is calculated different etch state grounded screen impedance frequency response curves and respective frequencies point impedance number list is provided, and having provided equivalent redius is 0-10kHz grounded screen resistance value and impedance frequency response curve under big or small, the different electric pressure of different test block transformer station between the different grounded screen materials of 6-20mm, the equidistant different earth grid of 5 * 5m to 12 * 12m and unequal-interval earth grid, two down conductors, the different test position situation of grounded screen.
4. a kind of grounding net of transformer substation etch state impedance frequency response measurement method according to claim 2; It is characterized in that; In described step 2.1～step 2.4, choose two down conductor positions based on as follows: be positioned at grounded screen middle part, grounded screen edge and grounded screen corner, each transformer station's test position is no less than 2 places; Survey frequency scope 0-10kHz, what measure is impedance between the two selected down conductors of grounded screen.
5. a kind of grounding net of transformer substation etch state impedance frequency response measurement method according to claim 1; It is characterized in that; In the described step 4; With measurement result and the original input data that calculates, the grounded screen same position impedance frequency response curve of measuring over the years relatively, obtain grounding body equivalent diameter after the corrosion of grounded screen earth conductor through interpolation and match, provide the corrosion class of grounded screen according to earthing material corrosion class grade scale.
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| CN103439631A (en) * | 2013-08-12 | 2013-12-11 | 国家电网公司 | Method and system for detecting corrosion state of grounding grid |
| CN103837775A (en) * | 2014-03-17 | 2014-06-04 | 国家电网公司 | Grounding grid corrosion diagnostic method and device |
| CN104090001A (en) * | 2014-07-29 | 2014-10-08 | 太原理工大学 | Method for evaluating corrosivity of polluted soil |
| CN104678229A (en) * | 2015-03-24 | 2015-06-03 | 国家电网公司 | Substation grounding grid corrosion monitoring system |
| CN104833898A (en) * | 2015-05-05 | 2015-08-12 | 国网上海市电力公司 | Substation grounding grid corrosion state evaluation method using M-sequence signal current |
| CN104898023A (en) * | 2015-06-10 | 2015-09-09 | 国网上海市电力公司 | Grounding network fault diagnosis method based on transfer function curve |
| CN104931853A (en) * | 2015-06-08 | 2015-09-23 | 上海交通大学 | Diagnosis method for transformer-station grounding net based on surface potential distribution |
| CN105182169A (en) * | 2015-10-10 | 2015-12-23 | 国网山西省电力公司临汾供电公司 | Defect screening detection method and apparatus of grounding network upper guide body wire |
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| CN110907344A (en) * | 2019-11-18 | 2020-03-24 | 深圳供电局有限公司 | Grounding grid corrosion rate detection system |
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| CN108551003A (en) * | 2018-06-22 | 2018-09-18 | 深圳供电局有限公司 | A kind of tubing grounded screen |
| CN109580463A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A method of measurement ground net corrosion degree |
| 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 |
| CN110907344B (en) * | 2019-11-18 | 2023-01-24 | 深圳供电局有限公司 | Grounding grid corrosion rate detection system |
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Application publication date: 20120613 |