CN102928673A - Method for acquiring impulse grounding resistance - Google Patents
Method for acquiring impulse grounding resistance Download PDFInfo
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- CN102928673A CN102928673A CN2012104133323A CN201210413332A CN102928673A CN 102928673 A CN102928673 A CN 102928673A CN 2012104133323 A CN2012104133323 A CN 2012104133323A CN 201210413332 A CN201210413332 A CN 201210413332A CN 102928673 A CN102928673 A CN 102928673A
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- 238000000034 method Methods 0.000 title claims abstract description 97
- 238000004088 simulation Methods 0.000 claims abstract description 22
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 238000012937 correction Methods 0.000 claims abstract description 4
- 238000013341 scale-up Methods 0.000 claims description 16
- 238000009472 formulation Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000010248 power generation Methods 0.000 abstract 1
- 230000009466 transformation Effects 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 33
- 230000000694 effects Effects 0.000 description 20
- 238000012360 testing method Methods 0.000 description 19
- 239000004020 conductor Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
- 230000008447 perception Effects 0.000 description 7
- 238000013214 routine measurement Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
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- 230000000739 chaotic effect Effects 0.000 description 1
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- 238000009863 impact test Methods 0.000 description 1
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Abstract
The invention provides a method for acquiring an impulse grounding resistance, belonging to the technical field of high voltage. The method disclosed by the invention comprises the following steps of: obtaining a high-current impulse grounding resistance and an industrial-frequency grounding resistance by using a simulation method, and dividing the high-current impulse grounding resistance by the industrial-frequency grounding resistance to obtain a proportional coefficient which takes the industrial-frequency grounding resistance as a reference under the numerical value simulation; and obtaining a high-current impulse resistance and the low-current impulse grounding resistance by using a simulation method through utilizing a method of taking the low-current impulse grounding resistance as a reference whatever the obtainment measure of the correction coefficient is based on experiential formula or simulated calculation, and dividing the high-current impulse grounding resistance and the low-current impulse grounding resistance to obtain a proportional coefficient which takes the low-current impulse grounding resistance as reference under the numerical value simulation. The invention aims at solving the technical problem of providing the method which is used for acquiring the impulse grounding resistance and effectively acquiring the impulse grounding resistance of a transformation substation, a power generation plant and a power transmission line pole tower.
Description
Technical field
The present invention relates to the High-Voltage Technology field, relate in particular to a kind of method of obtaining impulse earthed resistance.
Background technology
The impulse earthed resistance value is the important technology index of generating plant, transformer station and electric power line pole tower earthed system, and it is the important parameter of assessing earthed system security, validity when factory stands and shaft tower is struck by lightning.Currently become the necessary links in ground grid design, examination and the operational process for the obtaining of earthed system impulse earthed resistance, become an important process that ensures safe operation of power system.Relevant technologies rules regulation impulse earthed resistance needs routine test.
Current, for obtaining of impulse earthed resistance, mainly contain following three approach:
1. based on large electric current site test
In order to obtain the stake resistance of earthing device under lightning current impacts, also can directly carry out great current impact test.The basic ideas of the method are:
1) uses high-power impulse current generator, dash current is put on the earthing device.
2) fall-of-potential method that adopts standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential are measured the guide rule part 1: routine measurement " to recommend, the harvester of voltage and electric current uses respectively voltage divider and Luo-coil, cooperates the oscillograph recording data.
3) record surge voltage and impulse current waveform, and then obtain the ratio of voltage and the peak-to-peak value of electric current, thus obtain impulse earthed resistance.
The advantage of said method is truly, directly, accurately.The subject matter inconvenience is as the method for routine measurement, this be because: in order fully to highlight in test the perception effect of spark discharge effect and earth conductor to the impact of stake resistance, (miniwatt then can't fully show ionisation effect must to use high-power impulse current generator, power frequency then can't embody earth conductor perception effect, and this all will be so that the impulse earthed resistance that obtains meet actual conditions).Yet high-power impulse current generator often volume and weight is huge, carries out site test and need to expend huge man power and material, substantially can't satisfy the approach that daily measurement is obtained.
2. based on industrial frequency experiment and coefficient of impact experimental formula
This is a kind of method of indirectly obtaining the earthing device impulse earthed resistance.In industry standard DL/T621-1997 " ground connection of alternating-current electric device ", coefficient of impact is defined as the ratio of impulse earthed resistance and power frequency earthing resistance.The basic ideas of the method are:
1) at first, measures the power frequency earthing resistance of earthing device.The fall-of-potential method that the industrial frequency experiment measuring method adopts standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential are measured the guide rule part 1: routine measurement " to recommend can obtain power frequency earthing resistance.
2) and then, the experimental formula of utilizing industry standard DL/T 621-1997 " ground connection of alternating-current electric device " to recommend is calculated various difform coefficient of impact.
3) last, obtaining power frequency earthing resistance by test, utilizing after experimental formula in the standard obtains coefficient of impact, just can be according to definition calculating impulse earthed resistance.
The advantage of said method is that measuring method is simple, and shortcoming is:
The experimental formula of 1) recommending among the industry standard DL/T 621-1997 " ground connection of alternating-current electric device " is a kind of match value that obtains by test, the acquisition of these experimental formulas obtains under specific test condition, and the operating condition of test during actual the use can not the operating mode when obtaining experimental formula conform to fully, and the impulse earthed resistance that therefore obtains by this method has very large error.
The experimental formula of 2) recommending among the industry standard DL/T 621-1997 " ground connection of alternating-current electric device " is that the difformity according to various earthing device obtains, the experimental study personnel need to know the shape of target measurement shaft tower, for burying earthing device, if shape is unknown, then can't be suitable for.
3. based on Digital calculation modelling emulation
The third method of obtaining the earthing device impulse earthed resistance is based on the analog simulation method of numerical evaluation, and the main thought of the method is as follows:
1) experimental measurement soil resistivity: the four-electrode method that adopts standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential are measured the guide rule part 1: routine measurement " to recommend is measured the dominant resistance of soil; Based on numerical method, with the dominant resistance measurement value of above-mentioned soil the Fitting Calculation, obtain soil layering structure (level or vertical) and each layer thickness and resistivity.
2) experimental measurement soil 50% sparking voltage: gather soil sample, the method for utilizing standard GB/T/T16927.1-1997 " high-voltage test techniques first: ordinary test requires " to recommend is measured soil 50% sparking voltage; Measure the thickness of soil sample, utilize the relation of voltage and field intensity to obtain 50% discharge field intensity.
3) utilize numerical calculations earthing device impulse earthed resistance: with the measured value of the resistivity of soil and 50% sparking voltage as known quantity, the parameters such as the material of cooperation earthing device conductor, length, buried depth, by numerical method, calculate the transient state relation of earthed system voltage and current.Present existing numerical computation method comprises circuit method, Transmission line method and electromagnetic field method, and these methods have been considered perception effect and the spark discharge effect of earthing device conductor, satisfy certain accuracy requirement.
The advantage of said method is can be by simple site test, obtains soil parameters and in order to calculating, and then the transient state of the voltage that obtains various different earthing device and electric current concerns.The shortcoming of this method is:
The dominant resistance of soil that the four-electrode method of utilizing national standard to recommend measures need to obtain the soil layering structure by the numerical fitting method, comprises thickness and the resistivity of each layer of soil.Yet in fact, the prerequisite of this fitting process is level or the vertical stratification of strict rule for supposition soil resistivity hierarchy, and obviously this not necessarily conforms to actual state.Therefore utilize the method for numerical evaluation to calculate the fully real conditions of reflect soil of result, so simulation result is insecure.
As fully visible, the method that present three kinds of existing obtain the impedance of earthing device impulse grounding can't well satisfy the requirement of convenience, accuracy and reliability, therefore, instantly need a urgent technical matters that solves to be exactly: how can propose a kind of effective measures, the problem that exists to solve prior art.
Summary of the invention
Technical matters to be solved by this invention provides a kind of method of obtaining impulse earthed resistance, effectively obtains the impulse earthed resistance of transformer station, generating plant and electric power line pole tower.
In order to solve the problems of the technologies described above, the invention provides a kind of method of obtaining impulse earthed resistance, comprising:
Utilize emulation mode to obtain heavy current impact stake resistance and power frequency earthing resistance, and do the merchant obtain under the numerical simulation, the scale-up factor take power frequency earthing resistance as benchmark;
The method of utilizing little rush of current stake resistance to revise as benchmark is no matter the obtaining means of correction factor is based on experimental formula or simulation calculation;
Utilize emulation mode to obtain heavy current impact stake resistance and little rush of current stake resistance, and do the merchant obtain under the numerical simulation, the scale-up factor take little rush of current stake resistance as benchmark.
To sum up, the method of obtaining impulse earthed resistance provided by the invention, can be by test and the means of emulation combination, perception effect and the spark discharge effect of earth conductor under the effect of consideration heavy impulse current, convenient, accurately and reliably obtain the earthing device impulse earthed resistance.
Description of drawings
Fig. 1 is a kind of method flow diagram that obtains impulse earthed resistance of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to a kind of method flow diagram that obtains impulse earthed resistance shown in Figure 1, described method specifically comprises:
Step S101 utilizes emulation mode to obtain heavy current impact stake resistance and power frequency earthing resistance, and do the merchant obtain under the numerical simulation, the scale-up factor take power frequency earthing resistance as benchmark;
Step S102, the method for utilizing little rush of current stake resistance to revise as benchmark is no matter the obtaining means of correction factor is based on experimental formula or simulation calculation;
Step S103 utilizes emulation mode to obtain heavy current impact stake resistance and little rush of current stake resistance, and do the merchant obtain under the numerical simulation, the scale-up factor take little rush of current stake resistance as benchmark.
Fundamental purpose of the present invention is to propose the novel method of obtaining impulse earthed resistance.The method comprises two kinds of thinkings of obtaining impulse earthed resistance:
The one, obtain the power frequency earthing resistance of earthing device by the method for site test, and then method difference analog simulation power frequency earthing resistance and the heavy current impact stake resistance of employing numerical evaluation, both are the merchant obtain scale-up factor under the numerical simulation, take power frequency earthing resistance as benchmark (concept of similar front coefficient of impact), utilize this scale-up factor that the industrial frequency experiment result is revised;
The 2nd, obtain the little rush of current stake resistance of earthing device by the method for site test, and then the method difference little rush of current stake resistance of analog simulation and the heavy current impact stake resistance of employing numerical evaluation, both are the merchant obtain scale-up factor under the numerical simulation, take little rush of current stake resistance as benchmark, utilize this coefficient of impact that little rush of current test findings is revised.
In the specific implementation, concrete methods of realizing:
The implementation method of thinking one is as follows:
1) power frequency earthing resistance of measurement earthing device: the fall-of-potential method that the experimental measurement method all adopts standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential are measured the guide rule part 1: routine measurement " to recommend can obtain power frequency earthing resistance.
2) experimental measurement soil resistivity: the four-electrode method that adopts standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential are measured the guide rule part 1: routine measurement " to recommend is measured the dominant resistance of soil; Based on numerical method, with the dominant resistance measurement value of above-mentioned soil the Fitting Calculation, obtain soil layering structure (level or vertical) and each layer thickness and resistivity.
3) experimental measurement soil 50% sparking voltage: gather soil sample, the method for utilizing standard GB/T/T16927.1-1997 " high-voltage test techniques first: ordinary test requires " to recommend is measured soil 50% sparking voltage; Measure the thickness of soil sample, utilize the relation of voltage and field intensity to obtain 50% discharge field intensity.
4) utilize numerical calculations earthing device power frequency earthing resistance: with the soil resistivity measured value that obtains in the step 2 as known quantity, the parameters such as the material of cooperation earthing device conductor, length, buried depth, by numerical method, calculate the transient state relation of earthed system voltage and current.Present existing numerical computation method comprises circuit method, Transmission line method and electromagnetic field method.
5) utilize numerical calculations earthing device heavy current impact stake resistance: with the measured value of the resistivity of the soil that obtains in step 2 and 3 and 50% sparking voltage as known quantity, the parameters such as the material of cooperation earthing device conductor, length, buried depth, by numerical method, calculate the transient state relation of earthed system voltage and current.Present existing numerical computation method comprises circuit method, Transmission line method and electromagnetic field method, and these methods have been considered perception effect and the spark discharge effect of earthing device conductor, satisfy certain accuracy requirement.
6) ask for scale-up factor: power frequency earthing resistance and the heavy current impact stake resistance of the earthing device that obtains in step 4 and 5 are discussed, obtain under the numerical simulation, the scale-up factor take power frequency earthing resistance as benchmark (concept of similar front coefficient of impact).
7) scale-up factor that utilizes power frequency earthing resistance that step 1 obtains and step 6 to obtain amasss, and can obtain impulse earthed resistance.
The implementation method of thinking two and thinking one are similar, and distinguishing step is:
1) in the step 1, measure the little rush of current stake resistance of earthing device: method is with thinking one, but needs use little rush of current current source;
2) in the step 4, utilize the little rush of current stake resistance of numerical calculations earthing device: method is not also considered the spark discharge effect this moment with thinking one.
3) in the step 6, ask for scale-up factor: little rush of current stake resistance and the heavy current impact stake resistance of the earthing device that obtains in step 4 and 5 are discussed, obtain under the numerical simulation, the scale-up factor take little rush of current stake resistance as benchmark.
The advantage of said method is:
Compare with method one, the device that the method implementation process does not use high-power impulse current generator etc. to be not easy to test rely on comparatively accurate emulated computation method to obtain impact characteristics, so the method has convenience.
Compare with method two, the scale-up factor that the method is used derives from simulation calculation, and special shape or novel earthing device are able to and can accurately consider; Simultaneously, the method is asked in the process of scale-up factor, utilized the actual soil environment of target measurement shaft tower present position, this just eliminated the coefficient of impact experimental formula with and obtain operating mode in two processes and be not inconsistent the error come; Therefore the method has accuracy and reliability.
Compare with method three, the method has increased emulation and the test procedure of power frequency earthing resistance, this has just taken into full account the irregular error of bringing of testing ground soil layering structure, and with its reduction or elimination, has further increased accuracy and the reliability of the method.
The method has contained two kinds of thinkings, can play the effect of mutual checking during conditions permit, or condition not allow (as there not being miniwatt dash current source etc.) be to play the effect that complements each other.
Therefore, visible this programme can be considered perception effect and the spark discharge effect of earth conductor under the heavy impulse current effect, possesses convenient, accurate and reliable advantage.
This programme can be by test and the means of emulation combination, and perception effect and the spark discharge effect of earth conductor under the effect of consideration heavy impulse current are convenient, accurately and reliably obtain the earthing device impulse earthed resistance.This programme is especially to the earthed system that terrain environment of living in is complicated, soil layering is chaotic, and is more effective.
Above a kind of method of obtaining impulse earthed resistance provided by the present invention is described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (1)
1. a method of obtaining impulse earthed resistance is characterized in that, comprising:
Utilize emulation mode to obtain heavy current impact stake resistance and power frequency earthing resistance, and do the merchant obtain under the numerical simulation, the scale-up factor take power frequency earthing resistance as benchmark;
The method of utilizing little rush of current stake resistance to revise as benchmark is no matter the obtaining means of correction factor is based on experimental formula or simulation calculation;
Utilize emulation mode to obtain heavy current impact stake resistance and little rush of current stake resistance, and do the merchant obtain under the numerical simulation, the scale-up factor take little rush of current stake resistance as benchmark.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293419A (en) * | 2013-05-31 | 2013-09-11 | 华南理工大学 | Evaluation method of grounding device impact performance |
| CN103901328A (en) * | 2014-03-26 | 2014-07-02 | 国家电网公司 | Method suitable for calculating transmission line pole tower grounding body lightning impulse characteristics |
| CN104931793A (en) * | 2015-06-10 | 2015-09-23 | 国网上海市电力公司 | Substation grounding grid grounding resistance acquisition method |
| CN105182084A (en) * | 2015-07-02 | 2015-12-23 | 国家电网公司 | Method for obtaining impulse impedance of grounding device through low lightning current impulse test |
| CN105203851A (en) * | 2015-09-29 | 2015-12-30 | 国家电网公司 | Method for measuring large grounding grid ground impedance value under strong harmonic waves |
| CN105606924A (en) * | 2015-12-17 | 2016-05-25 | 陕西省电力科学研究院 | Impact characteristic measurement correction method for grounding device |
| CN106569038A (en) * | 2016-09-28 | 2017-04-19 | 国网山西省电力公司阳泉供电公司 | Method for testing impulse grounding resistance of pole of power transmission line |
| CN106597112A (en) * | 2016-10-31 | 2017-04-26 | 罗云峰 | Test equipment and test method thereof for testing impulse grounding resistance of transmission line pole type tower |
| CN109188089A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The test method of different pH values lower leaf soil non-linear resistance characteristic |
| CN109188090A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The nonlinear test method of different humidity electric resistance of soil in vertical demixing soil |
| CN112595938A (en) * | 2020-12-03 | 2021-04-02 | 河南四达电力设备股份有限公司 | Method for evaluating adaptability of graphite-based flexible grounding device of overhead transmission line tower |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293419A (en) * | 2013-05-31 | 2013-09-11 | 华南理工大学 | Evaluation method of grounding device impact performance |
| CN103901328A (en) * | 2014-03-26 | 2014-07-02 | 国家电网公司 | Method suitable for calculating transmission line pole tower grounding body lightning impulse characteristics |
| CN104931793A (en) * | 2015-06-10 | 2015-09-23 | 国网上海市电力公司 | Substation grounding grid grounding resistance acquisition method |
| CN105182084A (en) * | 2015-07-02 | 2015-12-23 | 国家电网公司 | Method for obtaining impulse impedance of grounding device through low lightning current impulse test |
| CN105203851B (en) * | 2015-09-29 | 2018-04-17 | 国家电网公司 | The method for measuring large ground network impedance ground value under strong harmonic wave |
| CN105203851A (en) * | 2015-09-29 | 2015-12-30 | 国家电网公司 | Method for measuring large grounding grid ground impedance value under strong harmonic waves |
| CN105606924A (en) * | 2015-12-17 | 2016-05-25 | 陕西省电力科学研究院 | Impact characteristic measurement correction method for grounding device |
| CN106569038A (en) * | 2016-09-28 | 2017-04-19 | 国网山西省电力公司阳泉供电公司 | Method for testing impulse grounding resistance of pole of power transmission line |
| CN106597112A (en) * | 2016-10-31 | 2017-04-26 | 罗云峰 | Test equipment and test method thereof for testing impulse grounding resistance of transmission line pole type tower |
| CN106597112B (en) * | 2016-10-31 | 2019-04-02 | 杭州潇楠科技有限公司 | Shock ground resistance of transmission line tower test device and its method |
| CN109188089A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The test method of different pH values lower leaf soil non-linear resistance characteristic |
| CN109188090A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The nonlinear test method of different humidity electric resistance of soil in vertical demixing soil |
| CN109188090B (en) * | 2018-08-13 | 2019-11-05 | 西南交通大学 | The nonlinear test method of different humidity electric resistance of soil in vertical demixing soil |
| CN112595938A (en) * | 2020-12-03 | 2021-04-02 | 河南四达电力设备股份有限公司 | Method for evaluating adaptability of graphite-based flexible grounding device of overhead transmission line tower |
| CN112595938B (en) * | 2020-12-03 | 2023-08-22 | 河南四达电力设备股份有限公司 | Method for evaluating adaptability of graphite-based flexible grounding device of pole tower of overhead transmission line |
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