CN102928673B - Method for acquiring impulse grounding resistance - Google Patents

Method for acquiring impulse grounding resistance Download PDF

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Publication number
CN102928673B
CN102928673B CN201210413332.3A CN201210413332A CN102928673B CN 102928673 B CN102928673 B CN 102928673B CN 201210413332 A CN201210413332 A CN 201210413332A CN 102928673 B CN102928673 B CN 102928673B
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China
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resistance
earthing
grounding resistance
soil
factor
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CN201210413332.3A
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Chinese (zh)
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CN102928673A (en
Inventor
张波
吴锦鹏
蒋愉宽
何金良
曾嵘
胡军
余占清
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清华大学
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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

Obtain the method for impulse earthed resistance

Technical field

The present invention relates to technical field of high voltage, particularly relate to a kind of method obtaining impulse earthed resistance.

Background technology

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 assessment plant stand and shaft tower earthed system security, validity when being struck by lightning.The current acquisition for earthed system impulse earthed resistance, becomes the necessary links in ground grid design, examination and operational process, becomes the important process ensureing safe operation of power system.Relevant technologies regulations stipulate impulse earthed resistance needs routine test.

Current, for the acquisition of impulse earthed resistance, mainly contain following three approach:

1. based on big current site test

In order to the stake resistance of earthing device under lightning current impacts can be obtained, also directly great current impact test can be carried out.The basic ideas of the method are:

1) use high-power impulse current generator, dash current is put on earthing device.

2) fall-of-potential method that standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential measure directive/guide part 1: routine measurement " recommends is adopted, the harvester of voltage and electric current uses voltage divider and Luo-coil respectively, coordinates 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 inconvenient method as routine measurement of subject matter, this be due to: in order to fully highlight in test spark discharge effect and the impact of earth conductor perception effect on stake resistance, (miniwatt then fully cannot show ionisation effect must to use high-power impulse current generator, power frequency then cannot embody the effect of earth conductor perception, and this all will make the impulse earthed resistance obtained not meet actual conditions).But high-power impulse current generator often volume and weight is huge, carrying out site test needs to expend huge man power and material, substantially cannot meet the approach that daily measurement obtains.

2. based on industrial frequency experiment and coefficient of impact experimental formula

This is a kind of method of indirect acquisition 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) power frequency earthing resistance of earthing device first, is measured.The fall-of-potential method that industrial frequency experiment measuring method adopts standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential measure directive/guide part 1: routine measurement " to recommend, can obtain power frequency earthing resistance.

2) and then, the experimental formula utilizing industry standard DL/T 621-1997 " ground connection of alternating-current electric device " to recommend, calculates various difform coefficient of impact.

3) last, obtaining power frequency earthing resistance by test, utilize after the experimental formula in standard obtains coefficient of impact, just can according to definition calculating impulse earthed resistance.

The advantage of said method is that measuring method is simple, and shortcoming is:

1) experimental formula of recommending in industry standard DL/T 621-1997 " ground connection of alternating-current electric device " is a kind of by testing the match value obtained, the acquisition of these experimental formulas obtains under specific test condition, and operating condition of test during actual use can not conform to completely with operating mode when obtaining experimental formula, the impulse earthed resistance therefore obtained by this method has very large error.

2) experimental formula of recommending in industry standard DL/T 621-1997 " ground connection of alternating-current electric device " obtains according to the difformity of various earthing device, experimental study personnel need the shape knowing target measurement shaft tower, for burying earthing device, if shape is unknown, then cannot be suitable for.

3. emulate based on Digital calculation modelling

The third method obtaining earthing device impulse earthed resistance is the analog simulation method based on numerical evaluation, and the main thought of the method is as follows:

1) soil resistivity is measured in test: the four-electrode method adopting standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential measure directive/guide part 1: routine measurement " to recommend measures the dominant resistance of soil; Based on numerical method, by dominant for above-mentioned soil resistivity measurements the Fitting Calculation, obtain soil fertility status (level or vertical) and each layer thickness and resistivity.

2) soil 50% sparking voltage is measured in test: gather soil sample, and the method utilizing standard GB/T/T16927.1-1997 " high-voltage test techniques Part I: ordinary test requires " to recommend measures soil 50% sparking voltage; Measure the thickness of soil sample, utilize the relation of voltage and field intensity to obtain 50% electric discharge field intensity.

3) numerical calculations earthing device impulse earthed resistance is utilized: using the measured value of the resistivity of soil and 50% sparking voltage as known quantity, coordinate the parameter such as material, length, buried depth of earthing device conductor, by numerical method, calculate the transient state relation of earthed system voltage and current.Current existing numerical computation method comprises circuit method, Transmission line method and electromagnetic field method, and these methods consider perception effect and the spark discharge effect of earthing device conductor, meet certain accuracy requirement.

The advantage of said method is can by simple site test, obtains soil parameters and in order to calculate, and then obtains the voltage of various different earthing device and the transient state relation of electric current.The shortcoming of this method is:

The dominant resistance of soil that the four-electrode method measurement utilizing national standard to recommend obtains, needs to obtain soil fertility status by Digital filting, comprises thickness and the resistivity of each layer of soil.But in fact, the prerequisite of this fitting process is suppose that soil resistivity hierarchy is level or the vertical stratification of strict rule, and obviously this not necessarily conforms to actual state.Therefore utilizing the method for numerical evaluation to calculate result can not the real conditions of abundant reflect soil, and therefore simulation result is insecure.

As fully visible, the method of three kinds of acquisition earthing device Transient grounding resistance of current existence well cannot meet the requirement of convenience, accuracy and reliability, therefore, instantly the urgent technical matters solved is needed exactly: how can propose a kind of effective measures, to solve prior art Problems existing.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of method 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 obtaining impulse earthed resistance, comprising:

Utilize emulation mode to obtain heavy current impact stake resistance and power frequency earthing resistance, and as business obtain under numerical simulation, take power frequency earthing resistance as the scale-up factor of benchmark;

Small area analysis impulse earthed resistance is utilized to carry out the method revised as benchmark, 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 small area analysis impulse earthed resistance, and obtain scale-up factor under numerical simulation, that be benchmark with small area analysis impulse earthed resistance as business.

To sum up, the method of acquisition impulse earthed resistance provided by the invention, can by testing and emulate the means of combination, consider perception effect and the spark discharge effect of earth conductor under heavy impulse current effect, convenient, accurately and reliably obtain earthing device impulse earthed resistance.

Accompanying drawing explanation

Fig. 1 is a kind of method flow diagram obtaining impulse earthed resistance of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

With reference to a kind of method flow diagram obtaining impulse earthed resistance shown in Fig. 1, described method specifically comprises:

Step S101, utilizes emulation mode to obtain heavy current impact stake resistance and power frequency earthing resistance, and as business obtain under numerical simulation, take power frequency earthing resistance as the scale-up factor of benchmark;

Step S102, utilizes small area analysis impulse earthed resistance to carry out the method revised as benchmark, 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 small area analysis impulse earthed resistance, and obtains scale-up factor under numerical simulation, that be benchmark with small area analysis impulse earthed resistance as business.

Fundamental purpose of the present invention is the method proposing novel acquisition impulse earthed resistance.The method comprises the thinking that two kinds obtain impulse earthed resistance:

One is the power frequency earthing resistance being obtained earthing device by the method for site test, and then adopt method analog simulation power frequency earthing resistance and the heavy current impact stake resistance respectively of numerical evaluation, both are business obtain under numerical simulation, take power frequency earthing resistance as the scale-up factor (concept of similar front coefficient of impact) of benchmark, utilize this scale-up factor to revise industrial frequency experiment result;

Two is the small area analysis impulse earthed resistances being obtained earthing device by the method for site test, and then adopt method analog simulation small area analysis impulse earthed resistance and the heavy current impact stake resistance respectively of numerical evaluation, both are business and obtain scale-up factor under numerical simulation, that be benchmark with small area analysis impulse earthed resistance, utilize this coefficient of impact to revise small area analysis Impulse Test Result.

In specific implementation, concrete methods of realizing:

The implementation method of thinking one is as follows:

1) measure the power frequency earthing resistance of earthing device: the fall-of-potential method that test measuring method all adopts standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential measure directive/guide part 1: routine measurement " to recommend, can power frequency earthing resistance be obtained.

2) soil resistivity is measured in test: the four-electrode method adopting standard GB/T/T 17949.1-2000 " soil resistivity of earthed system, impedance ground and ground potential measure directive/guide part 1: routine measurement " to recommend measures the dominant resistance of soil; Based on numerical method, by dominant for above-mentioned soil resistivity measurements the Fitting Calculation, obtain soil fertility status (level or vertical) and each layer thickness and resistivity.

3) soil 50% sparking voltage is measured in test: gather soil sample, and the method utilizing standard GB/T/T16927.1-1997 " high-voltage test techniques Part I: ordinary test requires " to recommend measures soil 50% sparking voltage; Measure the thickness of soil sample, utilize the relation of voltage and field intensity to obtain 50% electric discharge field intensity.

4) numerical calculations earthing device power frequency earthing resistance is utilized: using the soil resistivity measured value that obtains in step 2 as known quantity, coordinate the parameter such as material, length, buried depth of earthing device conductor, by numerical method, calculate the transient state relation of earthed system voltage and current.Current existing numerical computation method comprises circuit method, Transmission line method and electromagnetic field method.

5) numerical calculations earthing device heavy current impact stake resistance is utilized: using the measured value of the resistivity of soil that obtains in step 2 and 3 and 50% sparking voltage as known quantity, coordinate the parameter such as material, length, buried depth of earthing device conductor, by numerical method, calculate the transient state relation of earthed system voltage and current.Current existing numerical computation method comprises circuit method, Transmission line method and electromagnetic field method, and these methods consider perception effect and the spark discharge effect of earthing device conductor, meet certain accuracy requirement.

6) ask for scale-up factor: the power frequency earthing resistance of the earthing device obtained in step 4 and 5 and heavy current impact stake resistance are done business, obtain under numerical simulation, take power frequency earthing resistance as the scale-up factor (concept of similar front coefficient of impact) of benchmark.

7) scale-up factor that the power frequency earthing resistance utilizing step 1 to obtain and step 6 obtain amasss, and can obtain impulse earthed resistance.

Implementation method and the thinking one of thinking two are similar, and distinguishing step is:

1) in step 1, the small area analysis impulse earthed resistance of earthing device is measured: method with thinking one, but needs to use small area analysis dash current source;

2), in step 4, numerical calculations earthing device small area analysis impulse earthed resistance is utilized: method, with thinking one, does not now also consider spark discharge effect.

3) in step 6, ask for scale-up factor: the small area analysis impulse earthed resistance of the earthing device obtained in step 4 and 5 and heavy current impact stake resistance are done business, obtain scale-up factor under numerical simulation, that be benchmark with small area analysis impulse earthed resistance.

The advantage of said method is:

Compared with method one, the method implementation process does not use high-power impulse current generator etc. to be not easy to the device tested, and rely on comparatively accurate emulated computation method to obtain impact characteristics, therefore the method has convenience.

Compared with method two, the scale-up factor that the method uses derives from simulation calculation, and special shape or novel earthing device are able to accurately to consider; Meanwhile, the method is asked in the process of scale-up factor, make use of the actual soil environment of target measurement shaft tower present position, this obviates coefficient of impact experimental formula using and obtain operating mode in two processes and is not inconsistent come error; Therefore the method has accuracy and reliability.

Compared with method three, this method increase emulation and the test procedure of power frequency earthing resistance, this has just taken into full account irregular the brought error of testing ground soil fertility status, and is reduced or eliminate, and further increases accuracy and the reliability of the method.

The method covers two kinds of thinkings, can play the effect of checking mutually, or condition does not allow (as not having miniwatt dash current source etc.) to be to play the effect complemented each other during conditions permit.

Therefore, visible this programme can consider perception effect and the spark discharge effect of earth conductor under heavy impulse current effect, possesses convenient, accurate and reliable advantage.

This programme can by testing and emulate the means of combination, considers perception effect and the spark discharge effect of earth conductor under heavy impulse current effect, convenient, accurately and reliably obtain earthing device impulse earthed resistance.The earthed system that this programme is especially complicated to residing terrain environment, soil layering is chaotic, more effectively.

Above a kind of method obtaining impulse earthed resistance provided by the present invention is described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, 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. obtain a method for impulse earthed resistance, it is characterized in that, the method comprises the following steps:
Step 1, measures power frequency earthing resistance or the small area analysis impulse earthed resistance of earthing device;
Step 2, soil resistivity is measured in test, obtains soil fertility status and each layer thickness and resistivity;
Step 3, soil 50% sparking voltage is measured in test;
Step 4, utilize the power frequency earthing resistance of numerical calculations earthing device or small area analysis impulse earthed resistance: using the soil resistivity measured value that obtains in step 2 as known quantity, coordinate the parameter of earthing device conductor, by numerical method, calculate the transient state relation of earthed system voltage and current;
Step 5, utilize the heavy current impact stake resistance of numerical calculations earthing device: using the measured value of the resistivity of soil that obtains in step 2 and 3 and 50% sparking voltage as known quantity, coordinate the parameter of earthing device conductor, pass through numerical method, calculate the transient state relation of earthed system voltage and current, described numerical evaluation considers perception effect and the spark discharge effect of earthing device conductor;
Step 6, asks for scale-up factor,
When step 1 is measure the power frequency earthing resistance of earthing device, the method asking for scale-up factor in step 6 is: the power frequency earthing resistance of the earthing device obtained in step 4 and 5 and heavy current impact stake resistance are done business, obtain under numerical simulation, take power frequency earthing resistance as the scale-up factor of benchmark
When step 1 is measure the small area analysis impulse earthed resistance of earthing device, the method asking for scale-up factor in step 6 is: the small area analysis impulse earthed resistance of the earthing device obtained in step 4 and 5 and heavy current impact stake resistance are done business, obtains scale-up factor under numerical simulation, that be benchmark with small area analysis impulse earthed resistance;
Step 7, the scale-up factor that the power frequency earthing resistance utilizing step 1 to obtain or small area analysis impulse earthed resistance and step 6 obtain amasss, and obtains impulse earthed resistance.
CN201210413332.3A 2012-10-25 2012-10-25 Method for acquiring impulse grounding resistance CN102928673B (en)

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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
CN104931793B (en) * 2015-06-10 2018-01-30 国网上海市电力公司 A kind of grounding net of transformer substation impedance ground acquisition methods
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
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
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
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
CN109188089B (en) * 2018-08-13 2019-09-06 西南交通大学 The test method of different pH values lower leaf soil non-linear resistance characteristic

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CN102435918A (en) * 2011-09-14 2012-05-02 浙江省电力试验研究院 Large-current outdoor real model simulation test method for testing lightning impulse characteristics of grounding device

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