CN106526278A - Method for measuring ground potential rise - Google Patents
Method for measuring ground potential rise Download PDFInfo
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- CN106526278A CN106526278A CN201610947896.3A CN201610947896A CN106526278A CN 106526278 A CN106526278 A CN 106526278A CN 201610947896 A CN201610947896 A CN 201610947896A CN 106526278 A CN106526278 A CN 106526278A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
- G01R17/20—AC or DC potentiometric measuring arrangements
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Abstract
The invention relates to a method for measuring a ground potential rise. The method includes selecting two or more potential measuring points; measuring the distance and ground potential difference between each potential measuring point and a grounding device current ground entry point; according to the distance and ground potential difference, determining a function relationship between the distance and the ground potential difference; and according to the function relationship between the distance and the ground potential difference, calculating a ground potential rise which is the value of the ground potential difference when the value of the distance in the function relationship is infinitely great. According to a theoretical change trend of a ground potential rise, the method for measuring the ground potential rise provided by the embodiment of the invention obtains the ground potential difference between the grounding device current ground entry point and a point at infinity through an extrapolation method, and the ground potential difference is the ground potential rise. In actual measurement, a measurement circuit does not need to be placed at the point at infinity, the method has relatively good operability, and the workload in the measuring process is also reduced. At the same time, the ground potential rise is obtained through the extrapolation method, and the problem in the prior art that a ground potential rise measuring result is relatively small is also corrected.
Description
Technical field
The present invention relates to high-tension transmission technical field, more particularly to the measuring method that a kind of ground potential rises.
Background technology
In DC engineering debugging, artificial earthing's short-circuit test of transformer station or transmission line of electricity is an important debugging item
Mesh, for checking the operation characteristic of transformer station or transmission line of electricity in earth fault and protection operation performance.Transformer station or transmission of electricity
When circuit is short-circuited, partial short circuit electric current will flow into underground, cause the rising of ground potential, ground potential to enter place from electric current and open
Beginning progressively successively decreases to infinite point, and amplitude of successively decreasing is gradually reduced with the increase of distance.
Ground potential liter is that electric current enters current potential of the place relative to infinite point, and the ground potential with infinite point is zero, then
Potential rise is electric current and enters the potential difference between place and infinite point.To measure the ground potential that earth current is produced during short circuit
Rise, need measurement electric current to enter the potential difference between place and infinite point in theory.But, in practice, transformer station or
When circuit is short-circuited, short circuit current is provided from other far transformer stations or power plant, also implies that short dot
Nearby no Zero potential reference can be used as infinite point.Therefore, in actual measurement, the measurement that ground potential rises substantially is：Survey
Amount electric current enters the potential difference between place and as far as possible remote point.In this measurement process, need to be placed on as far as possible at a distance measurement line,
Cause arranging work for measurement line heavy, into the substantial amounts of human and material resources of consumption.And, how far no matter measure line placement, its test
As a result the actual result that ground potential rises can be all less than.
The content of the invention
The measuring method that a kind of ground potential rises is provided in the embodiment of the present invention, survey is risen to solve ground potential in prior art
The ground potential of the measurement of amount method rises problem of the result less than practically potential rise.
In order to solve above-mentioned technical problem, the embodiment of the invention discloses following technical scheme：
The measuring method that a kind of ground potential rises, including：
Choose two or more potential measurement points；
Measure each described potential measurement point and enter the distance between place and epd with grounding device electric current；
According to the distance and the epd, the functional relationship between the distance and epd is determined；
According to the functional relationship between the distance and epd, ground potential liter is calculated, wherein, the ground potential is upgraded to
When distance value in the functional relationship is infinitely great, the value of the epd.
Preferably, all potential measurement points are located on the same line, and two current potentials of arbitrary neighborhood are surveyed
The spacing of amount point is not less than at the distance between 2 points of lie farthest away on grounding device to be measured.
Preferably, it is described according to the distance and the epd, determine the letter between the distance and epd
Number relation, including：
Select inverse proportion functionBased on function, wherein, x is potential measurement point and grounding device electric current
Enter the distance between place, V(X)It is that corresponding potential measurement point and grounding device electric current enter epd between place, a, b are to treat
Determine parameter；
According to the distance and epd, the best fit numerical value of described undetermined parameter a, b is determined；
The best fit numerical value of described undetermined parameter a, b is substituted in the basic function, determines the distance with ground electricity
Functional relation between potential difference.
It is preferably, described that the best fit numerical value of described undetermined parameter a, b is determined according to the distance and epd,
Including：
When the quantity of the potential measurement point chosen is two, by it is two potential measurement points corresponding it is described away from
From substituting in the basic function with epd, the evaluation of a group of undetermined parameter a, b, the evaluation are calculated
For the best fit numerical value of described undetermined parameter a, b；
When the quantity of the potential measurement point chosen is two or more, using method of least square, undetermined parameter is determined
The best fit numerical value of a, b.
Preferably, it is described according to the distance and the epd, determine the letter between the distance and epd
Number relation, including：
According to the distance and epd, the functional image set up between the distance and epd.
From above technical scheme, the measuring method that a kind of ground potential provided in an embodiment of the present invention rises is chosen several
Potential measurement point, and measure each potential measurement point and grounding device electric current and enter the distance between place and epd, it is determined that
Function between distance and epd；According to the theoretical variation tendency that ground potential rises, by extrapolation, grounding device electricity is obtained
Flow into the potential difference between place and infinite point, as ground potential liter.The measurement that ground potential provided in an embodiment of the present invention rises
Method without the need for p-wire is positioned over infinite point, with preferable operability, reduces measurement process in measurement process
In workload.Meanwhile, ground potential liter is obtained by extrapolation, ground potential liter measurement result of the prior art is have modified less than normal
Problem.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
The present invention can be limited.
Description of the drawings
During accompanying drawing herein is merged in description and the part of this specification is constituted, show the enforcement for meeting the present invention
Example, and be used for explaining the principle of the present invention together with description.
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the schematic flow sheet of the measuring method that a kind of ground potential provided in an embodiment of the present invention rises.
Specific embodiment
Here in detail exemplary embodiment will be illustrated, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.Conversely, they be only with as appended by
The example of consistent apparatus and method in terms of some described in detail in claims, the present invention.
Fig. 1 is the schematic flow sheet of the measuring method that a kind of ground potential provided in an embodiment of the present invention rises, including following step
Suddenly：
Step S101, chooses two or more potential measurement points.
The method for choosing two or more potential measurement points is specially：Grounding device electric current enter place with it is infinite
Two or more potential measurement points are chosen between far point.The quantity of potential measurement point is more, then be more conducive to ground potential
The calculating accuracy for rising.Certainly, the quantity of potential measurement point is more, potential measurement point enters place more apart from grounding device electric current
Far, then heavier, measurement line the instrumentation of arranging work of measurement line is more difficult, therefore, in actual measurement process, not
May unconfined selection potential measurement point.In view of ground potential afterwards rises the data volume that calculating process needs, at least should choose
Two potential measurement points.It should be pointed out that those skilled in the art can according to actual needs or measurement ground soil resistivity distribution
Situation, the number of adjustment selection potential measurement point, such as 2,3,4 or 6 etc., which each falls within the protection model of the present invention
Enclose.
With reference to epd with distance change theoretical rule：Epd is with apart from monotonic increase and epd
In other words incremental amplitude, enters apart from grounding device electric current that place is nearer with apart from monotone decreasing, then the change of epd is got over
Hurry up；Enter apart from grounding device electric current that place is more remote, the change of potential point difference is slower, and in infinite point, it is steady that epd tends to one
Definite value.Therefore, when potential measurement point is chosen, in order to ensure the effectiveness of each potential measurement point, adjacent potential measurement should be made
Maintain a certain distance between point.In this example example, the spacing of two potential measurement points of arbitrary neighborhood is not less than D, and wherein D is
The distance between 2 points of lie farthest away on grounding device to be measured.For example, between 2 points of lie farthest away on grounding apparatus to be measured
Distance be 500m, i.e. D=500m, then the spacing of two potential measurement points of the arbitrary neighborhood chosen is not less than 500m.In reality
In the measurement process of border, suitable distance ruler can be selected according to the number of the potential measurement point chosen and the topographic features on measurement ground
It is very little, such as 500m, 600m or 700m, which is belonged in protection scope of the present invention.
In the present embodiment, all potential measurement points are located on the same line, and its reason is：Under uniform soil, soil
The distribution of earth resistivity is more uniform, and potential measurement point can be chosen at optional position, have no effect on the measurement result of potential difference；But
It is that, in the area of the soil resistivity anisotropic elastic solid such as mountain area, all potential measurement points should be chosen at same straight line as far as possible
On, the impact that soil is caused to potential difference measurement result in all directions resistivity difference can be reduced, the current potential of measurement can be also made
Difference is consistent with the variation tendency of distance.
Step S102, measures each described potential measurement point and enters the distance between place and ground potential with grounding device electric current
Difference.
Measure each potential measurement point and enter the distance between place (hereinafter referred distance) to grounding device electric current, in reality
Measurement ground, ground occurs certain fluctuating, now, should measure potential measurement point as far as possible and enter between place to grounding device electric current
Most short horizontal range.If all potential measurement points are located on the same line, surface relief measurement of adjusting the distance can be reduced and made
Into error.
From in traditional ground potential liter measuring method, using being artificially injected, steady-state current is different, the ground potential that the present invention is provided
The test electric current that the measuring method for rising is adopted is for short circuit current.Measurement line detects that each potential measurement point is entered with grounding device electric current
Real-time potential difference (hereinafter referred epd) between place.For the accuracy of the epd result of calculation after guaranteeing,
It should be noted that potential measurement point and grounding device electric current enter the value of the potential difference between place.It is in the present embodiment, unified to choose
Potential measurement point and grounding device electric current enter the potential difference peak value between place as the value of potential difference.Certainly, can also unify
Choose potential measurement point and grounding device electric current enters the potential difference virtual value between place as the value of potential difference.
Step S103, according to the distance and epd, determines the functional relationship between the distance and epd.
In step s 102, measurement obtains distance and epd two groups or more data, according to the number of measurement
According to it is determined that the functional relationship between distance and point potential difference.The form of expression of functional relationship has various, such as functional image or letter
Concrete determination process to functional image function relational expression is hereafter described in detail by number relational expression etc..
According to distance and epd, it is determined that the functional image between distance and epd.In the present embodiment, with distance
It is vertical coordinate for abscissa, epd, sets up the functional image of distance and a potential difference.First, survey using in step S102
The distance for measuring and the array data of epd, set up the scatterplot of distance and a potential difference.Then, by scatterplot
Point with smooth straight line connection, further according to epd with distance change theoretical rule：Epd with apart from monotonic increase,
And the figure in unmeasured region is supplemented complete by extrapolation, is obtained final product with apart from monotone decreasing by the incremental amplitude of epd
To the functional image of distance and a potential difference.It is of course also possible to epd be abscissa, distance be vertical coordinate, set up distance
With the functional image of a potential difference, it is consistent with above-mentioned steps which sets up process, will not be described here.
According to the distance and epd, the functional relation between the distance and epd is determined.
According to epd with distance change theoretical rule：Epd is with passing apart from monotonic increase, epd
Amplification degree with function based on the function with this trend apart from monotone decreasing, is selected, for example the function of inverse proportion form or
Function of logarithmic form etc., wherein, basic function contains undetermined parameter.According to the distance and ground potential that measure in step S102
Difference, determines the best fit data of undetermined parameter.The best fit numerical value of undetermined parameter is substituted in basic function, it is determined that distance
Functional relation between epd.
In the present invention, basic function chooses the function of the function or logarithmic form of inverse proportion form, rather than inverse proportion function
Or logarithmic function, reason is：In actual measurement, soil resistivity skewness causes the letter of epd and distance
Number relation not fully meets inverse ratio or logarithmic function.If directly selecting inverse ratio or logarithmic function as epd and distance
Functional relation, then risen using the calculated ground potential of this functional relation and its real ground potential value have it is larger inclined
Difference.Therefore, undetermined parameter is introduced in basic function, determine ginseng undetermined by data of the epd of field survey with distance
Several numerical value, so as to play correcting action to potency function, be conducive to obtaining the epd for more conforming to practical situation with
The functional relation of distance.
In the present embodiment, it is further detailed by taking inverse proportion function as an example.Choose inverse proportion functionMake
Based on function, wherein, x is that potential measurement point and grounding device electric current enter the distance between place, V(x)For corresponding potential measurement
Point and grounding device electric current enter epd between place, and a, b are undetermined parameter.According to the distance measured in step S102 and ground
The data of potential difference, determine the best fit numerical value of undetermined parameter a, b, and its detailed process is：
When the quantity of the potential measurement point chosen is two, by two potential measurement points corresponding distance and epd
Substitute in basic functionThe evaluation of one group of undetermined parameter a, b is calculated, this evaluation is as undetermined
The best fit numerical value of parameter a, b.
For example, two potential measurement points, respectively the first potential measurement point and the second potential measurement point, the first current potential are chosen
The distance between measurement point and short circuit current access point and epd are respectively 500m, 2.533kV, the second potential measurement point with it is short
The distance between road electric current access point is respectively 1000m, 3.3kV with epd；By two potential measurement points corresponding distance with
Epd is substituted in basic functionObtain one group of linear equation in two unknowns group with regard to a, b；This equation is solved, is obtained
The best fit data of a=4.067, b=767, i.e. undetermined parameter a, b are respectively 4.067 and 767, will determine the optimal of parameter a, b
Fitted data is substituted in basic function, it is determined that the functional relation between distance and epd, i.e.,
When the quantity of the potential measurement point chosen is two or more, using method of least square, undetermined parameter a, b are determined
Best fit numerical value.Its process is specially：If choosing n potential measurement point, n>2, potential measurement point and short circuit current access point it
Between distance and epd be expressed as (xi,Vi), calculate epd measured value ViWith the ground potential calculated using basic function
Difference value of calculation V(xi)Between sum of square of deviations
Taken according to binary function and be most worth, made
I.e.
The evaluation of a, b, as the best fit numerical value of undetermined parameter a, b are obtained according to above-mentioned solution of equation.
The best fit numerical value of undetermined parameter a, b is substituted in basic function, it is determined that the letter between distance and epd
Number relational expression.
Step S104, according to the functional relationship between the distance and epd, calculates ground potential liter.
According to the functional relationship between the distance and epd determined in step S103, ground potential liter is calculated, wherein, ground
Current potential is upgraded to the distance in the functional relationship during value infinity, the value of epd.
The form of expression of functional relationship has various, such as functional image or functional relation etc., hereafter will respectively according to letter
Number image or functional relation calculate the detailed process of epd and describe in detail.
In functional image of the distance with epd, when can speculate that distance tends to infinitely great by extrapolation, its correspondence
Ground potential difference, this current potential be difference be ground potential liter.
In functional relation V=f (x) of the distance with epd, it is infinity to make apart from x, asks ground potential difference V corresponding
Functional value, as ground potential liter.
For example, according to the functional relation between the distance and epd tried to achieve in step S103
Calculate epd.X=+ ∞ are made, V=4.067kV is tried to achieve.V=4.067kV is that ground potential rises peak value, is translated into effectively
It is worth for 2.876kV.Therefore, the ground potential for causing during artificial earthing's short circuit is upgraded to 2.876kV.
With regard to the device in above-described embodiment, wherein modules perform the concrete mode of operation in relevant the method
Embodiment in be described in detail, explanation will be not set forth in detail herein.
Those skilled in the art will readily occur to its of the present invention after considering description and putting into practice disclosure of the invention here
Its embodiment.The application is intended to any modification of the present invention, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the precision architecture for being described above and being shown in the drawings is the invention is not limited in, and
And various modifications and changes can be being carried out without departing from the scope.The scope of the present invention is limited only by appended claim.
Claims (5)
1. the measuring method that a kind of ground potential rises, it is characterised in that include：
Choose two or more potential measurement points；
Measure each described potential measurement point and enter the distance between place and epd with grounding device electric current；
According to the distance and the epd, the functional relationship between the distance and epd is determined；
According to the functional relationship between the distance and epd, ground potential liter is calculated, wherein, the ground potential is upgraded to described
When distance value in the functional relationship is infinitely great, the value of the epd.
2. the measuring method that ground potential according to claim 1 rises, it is characterised in that all potential measurement points are located at
On same straight line, and the spacing of two potential measurement points of arbitrary neighborhood is not less than lie farthest away on grounding device to be measured
The distance between 2 points.
3. the measuring method that ground potential according to claim 1 rises, it is characterised in that it is described according to the distance with it is described
Epd, determines the functional relationship between the distance and epd, including：
Select inverse proportion functionBased on function, wherein, x is that potential measurement point and grounding device electric current enter ground
The distance between point, V(X)It is that corresponding potential measurement point and grounding device electric current enter epd between place, a, b are ginseng undetermined
Number；
According to the distance and epd, the best fit numerical value of described undetermined parameter a, b is determined；
The best fit numerical value of described undetermined parameter a, b is substituted in the basic function, the distance and epd is determined
Between functional relation.
4. the measuring method that ground potential according to claim 3 rises, it is characterised in that described electric according to the distance and ground
Potential difference, determines the best fit numerical value of described undetermined parameter a, b, including：
When the quantity of the potential measurement point chosen is two, by the two potential measurement points corresponding distance with
Epd is substituted in the basic function, is calculated the evaluation of a group of undetermined parameter a, b, and the evaluation is institute
State the best fit numerical value of undetermined parameter a, b；
When the quantity of the potential measurement point chosen is two or more, using method of least square, undetermined parameter a, b are determined
Best fit numerical value.
5. the measuring method that ground potential according to claim 1 rises, it is characterised in that it is described according to the distance with it is described
Epd, determines the functional relationship between the distance and epd, including：
According to the distance and epd, the functional image set up between the distance and epd.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107449980A (en) * | 2017-06-23 | 2017-12-08 | 北京航空航天大学 | A kind of method for evaluating intelligent assembly tolerance Ground Electric Potential Rise ability |
| CN108761175A (en) * | 2018-05-18 | 2018-11-06 | 云南电网有限责任公司电力科学研究院 | A kind of ground potential rises detecting system and transmission line lightning stroke situation determines method |
| RU2686322C1 (en) * | 2018-08-28 | 2019-04-25 | Глеб Германович Кравцов | Device for monitoring potential on grounding circuit of power plant |
| CN111044812A (en) * | 2019-11-25 | 2020-04-21 | 国网江苏省电力有限公司电力科学研究院 | Method for estimating electrostatic voltage of grading ring of lightning arrester in transformer substation |
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| CN105467192A (en) * | 2015-12-21 | 2016-04-06 | 云南电网有限责任公司电力科学研究院 | Method for measuring converter station potential rising on earth |
| CN105954594A (en) * | 2016-06-17 | 2016-09-21 | 重庆大学 | Novel grounding network grounding resistance inverse short-distance measurement method and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105467192A (en) * | 2015-12-21 | 2016-04-06 | 云南电网有限责任公司电力科学研究院 | Method for measuring converter station potential rising on earth |
| CN105954594A (en) * | 2016-06-17 | 2016-09-21 | 重庆大学 | Novel grounding network grounding resistance inverse short-distance measurement method and apparatus |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107449980A (en) * | 2017-06-23 | 2017-12-08 | 北京航空航天大学 | A kind of method for evaluating intelligent assembly tolerance Ground Electric Potential Rise ability |
| CN107449980B (en) * | 2017-06-23 | 2019-12-31 | 北京航空航天大学 | Method for evaluating ground potential lifting tolerance of intelligent component |
| CN108761175A (en) * | 2018-05-18 | 2018-11-06 | 云南电网有限责任公司电力科学研究院 | A kind of ground potential rises detecting system and transmission line lightning stroke situation determines method |
| RU2686322C1 (en) * | 2018-08-28 | 2019-04-25 | Глеб Германович Кравцов | Device for monitoring potential on grounding circuit of power plant |
| CN111044812A (en) * | 2019-11-25 | 2020-04-21 | 国网江苏省电力有限公司电力科学研究院 | Method for estimating electrostatic voltage of grading ring of lightning arrester in transformer substation |
| CN111044812B (en) * | 2019-11-25 | 2021-11-09 | 国网江苏省电力有限公司电力科学研究院 | Method for estimating electrostatic voltage of grading ring of lightning arrester in transformer substation |
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Effective date of registration: 20210419 Address after: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee after: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Address before: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee before: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Patentee before: TSINGHUA University |