CN105606924A - Impact characteristic measurement correction method for grounding device - Google Patents
Impact characteristic measurement correction method for grounding device Download PDFInfo
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- CN105606924A CN105606924A CN201510953664.4A CN201510953664A CN105606924A CN 105606924 A CN105606924 A CN 105606924A CN 201510953664 A CN201510953664 A CN 201510953664A CN 105606924 A CN105606924 A CN 105606924A
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- earthing
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- grounding means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses an impact characteristic measurement correction method for a grounding device, and the method specifically comprises the following steps: 1, employing grounding electrodes arranged around the grounding device at equal intervals as backflow electrodes; 2, selecting potential reference points on the backflow electrodes; 3, obtaining impact grounding impedance in a mode of a correction coefficient, and measuring the impact grounding impedance, wherein the correction coefficient is solved based on an actual measurement soil model. The method employs the grounding electrodes arranged around the grounding device at equal intervals as the backflow electrodes, and guarantees the uniform distribution of disperse flow of the grounding device towards the surroundings. The method does not need to arrange the backflow electrodes remotely, so the testing is convenient. Meanwhile, an impact current generator is easier to generate a large current. The method obtains the impact grounding impedance in the mode of the correction coefficient, and the correction coefficient is solved based on the actual measurement soil model. While guaranteeing the uniform distribution of disperse flow of the grounding device towards the surroundings, the method achieves the more accurate measurement of the impact grounding impedance.
Description
Technical field
The present invention relates to a kind of earthing or grounding means and measure modification method, be specifically related to a kind of earthing or grounding means impact characteristicsMeasure modification method, belong to high voltage earthing test technical field.
Background technology
In power system in order to work and security needs, often need be by power system and electrical equipment thereofSome part is connected with the earth, Here it is ground connection; Power system ground connection can be divided into work with regard to its objectThree kinds of ground connection, lightning protection and protective groundings; Wherein lightning protection is the harm for fear of thunder and lightning, lightning-arrestThe thunder resisting equipments such as pin, lightning conducter and arrester all must be equipped with corresponding earthing or grounding means to lightning current is importedThe earth; Because the transmission line of electricity of power system is widely distributed, subject to thunderbolt most, and the thunder and lightning of transmission line of electricityStream is to import the earth by the earthing or grounding means of shaft tower, and operating experience both domestic and external shows, effectively reduces shaft towerEarth resistance is the effective measures the most of improving transmission line of electricity direct lightning strike protection effect. In the design of overhead line structuresIn, the impulse earthed resistance value of overhead line structures earthing or grounding means, directly has influence on the lightning protection effect of circuit. RightIn the shaft tower of general height, reducing Tower Impulse Grounding Resistance is to improve line lightning resisting level, reduction thunderbolt jumpingThe effective measures of lock rate. In order to ensure the lightning protection effect of transmission line of electricity, need the regularly state to tower groundingMeasure; Conventionally adopt at present the power frequency earthing resistance of measurement tower grounding to assess the state of tower grounding;The power frequency earthing resistance of the tower grounding power frequency short circuit current that is mainly used in releasing, and the impact characteristics of earthing or grounding meansDetermine the lightning protection effect of power system transmission line; Due to the longitudinally effect of inductance, earthing or grounding means is in punchingHit down and only have limited area in action, this during to power frequency earth resistance be directly proportional to the square root of floor spaceAnd inconsistent, therefore can not correctly assess the impact of shaft tower by measuring the power frequency earthing resistance of tower groundingGround state. Use impulse current generator to test the impact characteristics of tower grounding device, butThe method of test is mainly continued to use the three electrode method of power frequency earthing resistance test at present. Because the electric current under three electrode method returnsThe stream utmost point concentrates on a place, and in dash current, has comprised a large amount of high fdrequency components, causes measuring according to three electrode methodWhen the impact characteristics of earthing or grounding means, electric current skewness on earthing or grounding means, larger with actual conditions difference;Different from power frequency, the characteristic of earthing or grounding means under impacting is subject to the impact of earthing or grounding means CURRENT DISTRIBUTION very large; EspeciallyUnder heavy impulse current, can there are electric discharge phenomena in soil, the CURRENT DISTRIBUTION on these electric discharge phenomena and earthing or grounding meansClosely related. Because electric discharge is nonlinear, while therefore testing the impact characteristics of shaft tower earthing or grounding means, be necessaryEnsure that the CURRENT DISTRIBUTION on earthing or grounding means is consistent with actual conditions. In order to reach this purpose, there is researchUnit uses the metal ring that surrounds tested earthing or grounding means as the current reflux utmost point. Use metal ring as electricityFlow back to the utmost point and ensured that earthing or grounding means powers on wandering stream evenly in all directions, but because metal ring is apart from testedEarthing or grounding means is very near, its reverse potential producing on earthing or grounding means is very large, has greatly offset earthing or grounding meansCurrent potential, causes test result much smaller than actual value. Theory analysis shows, uses metal ring to return as electric currentAfter flowing extremely, only have when metal ring infinity, test result is just identical with reality, even if otherwise use annulusAs potential reference point, test result is also less than normal, and annulus is less, less than normal must be more; Due in reality veryThe difficult large circle that uses, has and use the backflow utmost point group who surrounds earthing or grounding means as the backflow utmost point, but all the other returns in realityStream ring is the same, still has the problems referred to above, therefore requires further improvement.
Summary of the invention
(1) technical problem that will solve
For addressing the above problem, the present invention proposes a kind of earthing or grounding means impact characteristics and measure modification method, repairThe soil model of positive coefficient based on actual measurement obtained, and ensureing earthing or grounding means being uniformly distributed to surrounding diffusingTime, realized impulse grounding impedance compared with Measurement accuracy.
(2) technical scheme
Earthing or grounding means impact characteristics of the present invention is measured modification method, and described method is specific as follows:
The first step, is used and is looped around the earthing pole of equidistantly arranging around earthing or grounding means as the backflow utmost point;
Second step, is chosen in potential reference point on return electrode;
The 3rd step, obtains impulse grounding impedance by the mode of correction factor, and correction factor is based on actual measurement soilModel is obtained, and measures impulse grounding impedance.
Further, the described first step to the three steps are specific as follows:
The first step, adopts near the soil apparent resistivity of four-electrode method test earthing or grounding means;
Second step, the soil apparent resistivity inverting based on recording obtains the hierarchical mode of soil resistivity;
The 3rd step, collects tested earthing or grounding means data;
The 4th step, is equidistantly evenly arranged 8 return electrodes in earthing or grounding means surrounding, and every electrode in depthIn 0.6~0.8m, contact well with soil, and use insulated wire that 8 return electrode equipotentials are connected;
The 5th step, is used heavy current impact generator between tested earthing or grounding means and 8 backflow utmost points, to inject punchingHit electric current, measure earth current waveform;
The 6th step, taking 8 return electrodes as potential reference point, measures the voltage waveform of earthing or grounding means;
The 7th step, asks the ratio of voltage waveform peak value and current waveform peak value, impacts as the apparent of earthing or grounding meansImpedance ground;
The 8th step, taking the earth current waveform that records in described the 5th step as basis, the tested earthing or grounding means of emulationIn stratified soil model taking 8 return electrodes the impulse earthed resistance test result during as potential reference point;
The 9th step, taking the earth current waveform that records in described the 5th step as basis, does not consider 8 electricity that refluxThe existence of the utmost point, at stratified soil model, taking infinity, the impact as potential reference point connects the tested earthing or grounding means of emulationEarth resistance test result;
The tenth step, obtains in the 8th step the ratio of result of calculation in result of calculation and the 9th step, by this ratio withThe apparent impulse grounding impedance recording in the 7th step is multiplied each other, and obtains final impulse grounding impedance.
(3) beneficial effect
Compared with prior art, earthing or grounding means impact characteristics of the present invention is measured modification method, tool in the present inventionThere is following advantage:
The present invention uses and is looped around the earthing pole of equidistantly arranging around earthing or grounding means as the backflow utmost point, has ensuredEarthing or grounding means is uniformly distributed to surrounding diffusing; The present invention is due to without arranging farly by the backflow utmost point, thereforeConvenient test, impulse current generator also more easily produces large electric current simultaneously; The present invention clicks potential referenceSelect on return electrode, reduced to greatest extent the direct error of test generation; The present invention by correction isThe mode of number obtains impulse grounding impedance, and the soil model of correction factor based on actual measurement obtained, and ensureingEarthing or grounding means is to the equally distributed while of surrounding diffusing, realized impulse grounding impedance compared with Measurement accuracy.
Brief description of the drawings
Fig. 1 is that embodiments of the invention 1 return electrode is arranged schematic diagram;
Fig. 2 is the correction factor schematic diagram of the impulse grounding testing impedance of embodiments of the invention 1.
Detailed description of the invention
Earthing or grounding means impact characteristics of the present invention is measured modification method, and it is specific as follows:
The first step, is used and is looped around the earthing pole of equidistantly arranging around earthing or grounding means as the backflow utmost point;
Second step, is chosen in potential reference point on return electrode;
The 3rd step, obtains impulse grounding impedance by the mode of correction factor, and correction factor is based on actual measurement soilModel is obtained, and measures impulse grounding impedance.
Wherein, described method is specific as follows:
The first step, adopts near the soil apparent resistivity of four-electrode method test earthing or grounding means;
Second step, the soil apparent resistivity inverting based on recording obtains the hierarchical mode of soil resistivity;
The 3rd step, collects tested earthing or grounding means data;
The 4th step, is equidistantly evenly arranged 8 return electrodes in earthing or grounding means surrounding, and every electrode in depthIn 0.6~0.8m, contact well with soil, and use insulated wire that 8 return electrode equipotentials are connected;
The 5th step, is used heavy current impact generator between tested earthing or grounding means and 8 backflow utmost points, to inject punchingHit electric current, measure earth current waveform;
The 6th step, taking 8 return electrodes as potential reference point, measures the voltage waveform of earthing or grounding means;
The 7th step, asks the ratio of voltage waveform peak value and current waveform peak value, impacts as the apparent of earthing or grounding meansImpedance ground;
The 8th step, taking the earth current waveform that records in described the 5th step as basis, the tested earthing or grounding means of emulationIn stratified soil model taking 8 return electrodes the impulse earthed resistance test result during as potential reference point;
The 9th step, taking the earth current waveform that records in described the 5th step as basis, does not consider 8 electricity that refluxThe existence of the utmost point, at stratified soil model, taking infinity, the impact as potential reference point connects the tested earthing or grounding means of emulationEarth resistance test result;
The tenth step, obtains in the 8th step the ratio of result of calculation in result of calculation and the 9th step, by this ratio withThe apparent impulse grounding impedance recording in the 7th step is multiplied each other, and obtains final impulse grounding impedance.
Embodiment 1:
As shown in Figure 1, in 40 Europe rice uniform soils, be embedded with 3 kinds of tested cross earthing or grounding means, extendThe utmost point is respectively 5,10,15m. 8 backflows are extremely equidistantly arranged on the circumference that radius is 20m, obtain asThe correction factor of the impulse grounding testing impedance shown in Fig. 2.
Embodiment recited above is described the preferred embodiment of the present invention, not to thisBright design and scope limit. Do not departing under the prerequisite of design concept of the present invention this area ordinary peopleVarious modification and improvement that member makes technical scheme of the present invention, all should drop into protection scope of the present invention,The technology contents of request protection of the present invention, has all been documented in claims.
Claims (2)
1. earthing or grounding means impact characteristics is measured a modification method, it is characterized in that, described method is specific as follows:
The first step, is used and is looped around the earthing pole of equidistantly arranging around earthing or grounding means as the backflow utmost point;
Second step, is chosen in potential reference point on return electrode;
The 3rd step, obtains impulse grounding impedance by the mode of correction factor, and correction factor is based on actual measurement soilModel is obtained, and measures impulse grounding impedance.
2. earthing or grounding means impact characteristics according to claim 1 is measured modification method, it is characterized in that:The described first step to the three steps are specific as follows:
The first step, adopts near the soil apparent resistivity of four-electrode method test earthing or grounding means;
Second step, the soil apparent resistivity inverting based on recording obtains the hierarchical mode of soil resistivity;
The 3rd step, collects tested earthing or grounding means data;
The 4th step, is equidistantly evenly arranged 8 return electrodes in earthing or grounding means surrounding, and every electrode in depthIn 0.6~0.8m, contact well with soil, and use insulated wire that 8 return electrode equipotentials are connected;
The 5th step, is used heavy current impact generator between tested earthing or grounding means and 8 backflow utmost points, to inject punchingHit electric current, measure earth current waveform;
The 6th step, taking 8 return electrodes as potential reference point, measures the voltage waveform of earthing or grounding means;
The 7th step, asks the ratio of voltage waveform peak value and current waveform peak value, impacts as the apparent of earthing or grounding meansImpedance ground;
The 8th step, taking the earth current waveform that records in described the 5th step as basis, the tested earthing or grounding means of emulationIn stratified soil model taking 8 return electrodes the impulse earthed resistance test result during as potential reference point;
The 9th step, taking the earth current waveform that records in described the 5th step as basis, does not consider 8 electricity that refluxThe existence of the utmost point, at stratified soil model, taking infinity, the impact as potential reference point connects the tested earthing or grounding means of emulationEarth resistance test result;
The tenth step, obtains in the 8th step the ratio of result of calculation in result of calculation and the 9th step, by this ratio withThe apparent impulse grounding impedance recording in the 7th step is multiplied each other, and obtains final impulse grounding impedance.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105652093A (en) * | 2015-12-30 | 2016-06-08 | 国家电网公司 | Grounding device impact grounding impedance test method |
CN106771930A (en) * | 2017-01-17 | 2017-05-31 | 国家电网公司 | A kind of apparatus and method for observing drop bar surrounding soil impulsive discharge characteristic |
CN106841814A (en) * | 2017-01-26 | 2017-06-13 | 江苏德大自动化设备有限公司 | Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method |
CN112213564A (en) * | 2020-09-25 | 2021-01-12 | 南方电网科学研究院有限责任公司 | Railway soil resistivity measurement method |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105652093A (en) * | 2015-12-30 | 2016-06-08 | 国家电网公司 | Grounding device impact grounding impedance test method |
CN106771930A (en) * | 2017-01-17 | 2017-05-31 | 国家电网公司 | A kind of apparatus and method for observing drop bar surrounding soil impulsive discharge characteristic |
CN106771930B (en) * | 2017-01-17 | 2019-07-02 | 国家电网公司 | A kind of device and method for observing grounding rod surrounding soil impulsive discharge characteristic |
CN106841814A (en) * | 2017-01-26 | 2017-06-13 | 江苏德大自动化设备有限公司 | Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method |
CN112213564A (en) * | 2020-09-25 | 2021-01-12 | 南方电网科学研究院有限责任公司 | Railway soil resistivity measurement method |
CN112213564B (en) * | 2020-09-25 | 2021-09-03 | 南方电网科学研究院有限责任公司 | Railway soil resistivity measurement method |
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