CN104569608B - A kind of Transient grounding resistance on-site measurement method based under heavy impulse current - Google Patents
A kind of Transient grounding resistance on-site measurement method based under heavy impulse current Download PDFInfo
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- CN104569608B CN104569608B CN201410770672.0A CN201410770672A CN104569608B CN 104569608 B CN104569608 B CN 104569608B CN 201410770672 A CN201410770672 A CN 201410770672A CN 104569608 B CN104569608 B CN 104569608B
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Abstract
The invention discloses a kind of on-site measurement method based on the Transient grounding resistance under heavy impulse current, this method includes the wiring to electric current pole, the wiring of impulse current generator, the measurement wiring of decanting point voltage signal and the measurement of decanting point current signal wiring.Technical solution provided by the invention can really reflect the characteristic of dash current diffusing in the soil, the actual measurement that grounding characteristics are impacted in impedance under large inrush current may be implemented, accurate measurement Transient grounding resistance, facilitate the impact characteristics of grasp grounding body, design, construction and the operation of guidance and checking engineering lightning protection, engineering overall security and reliability are improved, there is operability.
Description
Technical field
The present invention relates to a kind of impedance measurement methods, and in particular to a kind of Transient grounding resistance based under heavy impulse current
On-site measurement method.
Background technique
With the rapid development of the national economy, the scale of electric line and electrified railway power supply system it is increasing,
Structure becomes increasingly complex, and Climate and Environment Variation is abnormal in recent years in addition, lightening activity is increasingly frequent, therefore very concern lightning stroke pair
System safety jeopardizes.The fields such as power transmission and distribution and railway are constantly reinforced or pay attention to Thunder Protection, and put into a large amount of manpower and
The research of financial resources development shocking preventing technology and measure.But lightning protection is not still solved safely, no matter in technology or passes through
All there is larger deficiency in Ji property, lightning protection measures specific aim is not strong, is still in single, extensive situation.With extra-high voltage grid
The high-speed electric railway of sum starts to step into the high-speed developing period, the raising of voltage class and shaft tower height and system scale
The more complication of further expansion, structure.It is contemplated that shocking preventing technology relatively lags behind between economic fast development
Contradiction must solve as early as possible.
The Thunder Protection in the fields such as power transmission and distribution and railway is in the safe operation for ensureing transmission and distribution network and the railway system as a result,
In have highly important status, so how to reduce lightening hazard become system safe and stable operation an important content.
Actual motion statistical result shows to influence in the factor of the resistance to thunder level of security of system, improves its impulse grounding characteristic
It is to reduce lightning strike accident, improves the effective ways of safe operation reliability.At present in the design and construction of power transmission and distribution project, drop
Resistance measure predominantly uses extended ground conductor, increases the measures such as ray radical, but these drop resistance measures are for reducing impulse grounding
The effect of resistance is often unknown；And in designing and constructing in railway engineering, often impulse grounding characteristic is not taken into account
It goes, the requirement whether the impulse grounding characteristic of natural grounding substance meets lightning Protection Design makes people uneasy.Therefore, it is necessary to grasp
Its impulse grounding characteristic proposes impact system with the related data of the safety of checking engineering lightning protection, in conjunction with industrial frequency electric resistance interpretation of result
Number provides timely, scientific, reliable and accurate foundation to reduce the engineering design and construction of Transient grounding resistance.
The complexity of the time-varying electric field generated when device aerial drainage grounded due to dash current is difficult theoretically to derive
More accurate mathematic(al) representation, so the impact characteristics of earthing or grounding means can only be disclosed from the angle of in-site measurement.Generally adopt
It differs larger with true lightning impulse situation with the impulse earthed resistance that high-voltage pulse method measures, therefore measures the impact of shaft tower
Ground resistance cannot reflect the result obtained in the case of Practical Project.So the practical knot of engineering actual environment need to be restored as far as possible
Fruit, accurately to grasp its impact characteristics.But field measurement by all if you need to have powerful dash current flow-generator and big
Actual measurement place, need to put into the limitation of the conditions such as a large amount of manpower and material resources, thus the research of domestic and foreign scholars mostly be that theory is ground
Study carefully, it is difficult to field measurement.
Therefore it need to propose that a kind of impedance surveys device to realize on the basis of above-mentioned test simulation research and actual measurement application
The accurate measurement in scene of the impedance under large inrush current.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of Transient grounding resistance scene survey based under heavy impulse current
Amount method, measuring device include earthing or grounding means, impulse current generator, Rogowski coil, divider, oscillograph and electric current pole；Institute
State measurement method the following steps are included:
A, the wiring of electric current pole: using the earthing or grounding means to be evenly arranged the electric current pole on the circle path in the center of circle, with volume
Copper wire is knitted the electric current is extremely connected and is connected to the impulse current generator ontology pedestal；
The wiring of impulse current generator: b draws braiding copper wire as electricity from the high-voltage end of the impulse current generator
Lead is flowed, and is connected at the measurement decanting point of the earthing or grounding means；
C, the measurement wiring of decanting point voltage signal: hanging electricity is drawn at the measurement decanting point of the earthing or grounding means
Voltage lead wires, and be connected at the divider to obtain the surge voltage signal at decanting point；
D, the measurement wiring of decanting point current signal: by described in Rogowski coil access at the collector ring of the electric current pole
The other end of oscillograph, the oscillograph is connected to the divider with stub cable.
Preferably, electric current pole radical is no less than 8.
Preferably, the distance between the initial placement position of the electric current pole and the edge of the earthing or grounding means are 5m.
Preferably, the impulse current generator is moveable.
Preferably, the impulse current generator, the Rogowski coil and the oscillograph insulate with bottom surface.
Preferably, the impulse current generator, the oscillograph are independently-powered.
Preferably, the bus bar of the electric current pole disconnects at the divider.
Preferably, the angle of the voltage lead and current feed in space should be not less than 90 °.
The invention has the benefit that
The present invention is based on great current impact test results of study and numerical value Simulation results, propose a kind of based on impact
The on-site measurement method of the Transient grounding resistance of high current can more actually reflect lightning current in the soil by the measurement method
Distribution situation, can accurately measure the Transient grounding resistance of grounding body.Measured result can examine whether the design of grounding body meets
Lightning protection requirement, and surveyed by the impact to certain seed type grounding body, it obtains its impact coefficient curve, surveys at the scene in the future
Its power frequency earthing resistance is only measured in amount, in conjunction with existing impact coefficient curve, so that it may its Transient grounding resistance be calculated, help
In the impact characteristics for grasping grounding body, design, construction and the operation of guidance and checking engineering lightning protection improve engineering overall security
And reliability, there is operability.
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is that the present invention is based on the wiring schematic diagrams of the field measurement apparatus of the Transient grounding resistance of heavy impulse current；
Fig. 2 is influence diagram of the current-voltage measurement circuit angle in Fig. 1 of the present invention to measurement result.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
In order to thoroughly understand the embodiment of the present invention, detailed structure will be proposed in following description.Obviously, the present invention is real
The execution for applying example is not limited to the specific details that those skilled in the art is familiar with.Presently preferred embodiments of the present invention is retouched in detail
State it is as follows, however in addition to these detailed description other than, the present invention can also have other embodiments.
Referring to Fig.1, Fig. 1 is that the present invention is based on the wiring of the field measurement apparatus of the Transient grounding resistance of heavy impulse current to show
It is intended to.Measuring device as shown in the figure include earthing or grounding means, mobile impulse current generator, Rogowski coil, divider, oscillograph and
Electric current pole composition；The measurement method the following steps are included:
A, the wiring of electric current pole: being evenly arranged the electric current pole using the earthing or grounding means as the circle path in the center of circle, then with compiling
It knits copper wire and the electric current is extremely connected, be finally connected to the pedestal of the impulse current generator ontology；This dash current recycling
Arrangement can more actually reflect the diffusing distribution situation of lightning current in the soil, therefore ensure that survey down with practical conditions
Measure the accuracy of result.It should be noted that following details in the placement process of electric current pole:
1) electric current pole need to be uniformly distributed, and radical should be as more as possible, and specific radical can be at the scene by changing electric current pole
Measurement result when radical compares determination.It is recommended that electric current pole radical is at least 8.
2) it has to be ensured that electric current pole and the enough distances of earthing or grounding means, so that soil between the two under heavy impulse current
Earth has nearly zero potential region.For the suitable arrangement distance for finding electric current pole, the radius of electric current polar circle can be changed, it will be different half
Measurement result under diameter is compared, and the Transient grounding resistance difference under adjacent three kinds of radiuses is that can choose half within 10%
The maximum position of diameter is the position of electric current pole.It is different from power current, the decaying of dash current in the soil quickly, therefore
It is recommended that the initial placement position of electric current pole and the border 5m of earthing or grounding means.
3) it is the recovering effect for increasing dash current, the resistance at electric current pole should be minimized, including suitably increase electric current
Polar diameter is with soil at embedded depth, compacting electric current pole to improve itself and the contact effect of electric current pole, bold and vigorous (salt) water wetting current
The measures such as soil at pole.
The wiring of impulse current generator: b draws a braiding copper wire from the high-voltage end of the impulse current generator and makees
For current feed, it is connected at the measurement decanting point of the earthing or grounding means；This mode of connection requires have moveable high current punching
Current feedback circuit is hit, impulse current generator should be placed in the periphery in the circle path of electric current pole and keep certain distance therewith.Punching
To hit current feedback circuit should insulate in placement with ground, can be carried out being isolated with ground with insulation column etc..Dash current occurs
Device ontology needs to power, therefore needs the power supply units such as generator at the scene.To avoid in actual measurement caused by large inrush current
Overvoltage causes damages to power supply system (generator etc.), it is necessary to one is concatenated between power supply system and impulse current generator
Isolating transformer.Isolating transformer and generator should be as far as possible far from electric current poles, and palpus insulation against ground isolation is placed, and carries out distal end
Zero potential ground connection.In current feed placement process, it should be noted and have centainly absolutely with objects such as ground, electric current pole or periphery weeds
Edge distance, to avoid during actual measurement lead cause flashover breakdown between ground or other objects.
C, one the measurement wiring of decanting point voltage signal: is drawn at the measurement decanting point of the earthing or grounding means vacantly
Voltage lead, be connected at the divider to obtain the surge voltage signal at decanting point.To reduce electric current polar curve to partial pressure
The coupling of device cable measuring signal can disconnect electric current pole bus bar, as shown in Fig. 1 at divider.To reduce electric current
The angle of coupling of the lead to divider voltage lead signal, voltage lead and current feed in space should be such as attached not less than 90 °
Shown in Fig. 2.
D, the measurement wiring of decanting point current signal: by described in Rogowski coil access at the collector ring of the electric current pole
Oscillograph is connected to the divider by stub cable in the other end of the oscillograph.It is independently-powered with a charged pool in figure
Oscillograph-stub cable-Rogowski coil measures the current signal of decanting point as an independent measuring unit.It was routed
It may be noted that the independent measuring unit needs insulation against ground in journey, the current measurement also at measurement electric current pole collector ring is alternative
Dash current at decanting point, as shown in Fig. 1, the measurement result difference that the two compares in amplitude and waveform are all little.
In addition, survey crew and measurement manipulation instrument must carry out insulation against ground processing, and instrument needs in measurement process
It wants independently-powered, does not allow to have any electrical connection with impact body and generator.
It can more actually reflect the distribution situation of lightning current in the soil by above-mentioned measurement method, can accurately measure ground connection
The Transient grounding resistance of body.Measured result can examine whether the design of grounding body meets lightning protection requirement, and by certain
The impact of type grounding body is surveyed, and obtains its impact coefficient curve, only measures its power frequency earthing resistance in measurement at the scene in the future,
In conjunction with existing impact coefficient curve, so that it may its Transient grounding resistance be calculated, facilitate the impact characteristics for grasping grounding body, refer to
The design, construction and operation with checking engineering lightning protection are led, engineering overall security and reliability are improved, there is operability.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, and those of ordinary skill in the art still can be to this hair
Bright specific embodiment is modified or replaced equivalently, these without departing from spirit and scope of the invention any modification or
Equivalent replacement is being applied within pending claims.
Claims (1)
1. a kind of on-site measurement method based on the Transient grounding resistance under heavy impulse current, measuring device include earthing or grounding means,
Impulse current generator, Rogowski coil, divider, oscillograph and electric current pole；
It is characterized in that, the measurement method the following steps are included:
A, the wiring of electric current pole: using the earthing or grounding means to be evenly arranged the electric current pole on the circle path in the center of circle, with braiding copper
The electric current is extremely connected and is connected to the impulse current generator ontology pedestal by line；
The wiring of impulse current generator: b draws braiding copper wire as electric current from the high-voltage end of the impulse current generator and draws
Line, and be connected at the measurement decanting point of the earthing or grounding means；
The measurement wiring of decanting point voltage signal: c draws hanging voltage at the measurement decanting point of the earthing or grounding means and draws
Line, and be connected at the divider to obtain the surge voltage signal at decanting point；
The measurement wiring of decanting point current signal: d accesses the oscillography by Rogowski coil at the collector ring of the electric current pole
The other end of device, the oscillograph is connected to the divider with stub cable；
Electric current pole radical is no less than 8；
The distance between initial placement position and the edge of the earthing or grounding means of the electric current pole are 5m；
The impulse current generator is moveable impulse current generator；
The impulse current generator, the Rogowski coil and the oscillograph insulate with bottom surface；
The impulse current generator, the oscillograph are independently-powered；
The bus bar of the electric current pole disconnects at the divider；
The angle of the voltage lead and current feed in space is not less than 90 °.
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| CN106199202A (en) * | 2015-05-05 | 2016-12-07 | 国家电网公司 | A kind of line steel tower grounded screen Transient grounding resistance measuring instrument |
| 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 |
| CN105467248A (en) * | 2015-12-17 | 2016-04-06 | 清华大学 | Method for measuring and amending impact characteristics of grounding device |
| 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 |
| CN106885946A (en) * | 2017-03-13 | 2017-06-23 | 贵州电网有限责任公司电力科学研究院 | A kind of impact grounding impedance measuring system and measuring method |
| CN107219423A (en) * | 2017-06-06 | 2017-09-29 | 中国电力科学研究院 | Lightning impulse response measurement system |
| CN109470928B (en) * | 2018-06-26 | 2020-09-15 | 国网浙江省电力有限公司衢州供电公司 | Method for measuring tower grounding resistance by arranging poles in tower footing |
| 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 |
| CN111722018A (en) * | 2020-06-17 | 2020-09-29 | 湖北宏源电力设计咨询有限公司 | Method for testing impulse grounding resistance of power transmission line tower |
| CN112415340B (en) * | 2020-10-27 | 2021-12-21 | 清华大学 | Device and method for observing three-dimensional discharge morphology of soil around ground rod |
| CN112505423B (en) * | 2020-11-30 | 2022-01-21 | 广东电网有限责任公司佛山供电局 | System and method for evaluating impact impedance distortion rate of horizontal grounding electrode |
| CN112505424B (en) * | 2020-11-30 | 2022-01-11 | 广东电网有限责任公司佛山供电局 | System and method for evaluating impact impedance distortion rate of vertical grounding electrode |
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