CN101825662B - Short-distance measurement method and structure of grounding resistance of grounding network - Google Patents

Short-distance measurement method and structure of grounding resistance of grounding network Download PDF

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Publication number
CN101825662B
CN101825662B CN201010185450A CN201010185450A CN101825662B CN 101825662 B CN101825662 B CN 101825662B CN 201010185450 A CN201010185450 A CN 201010185450A CN 201010185450 A CN201010185450 A CN 201010185450A CN 101825662 B CN101825662 B CN 101825662B
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China
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utmost point
electric current
current utmost
grounding
grounded screen
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CN201010185450A
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Chinese (zh)
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CN101825662A (en
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谢炎林
谢威
刘品
王槐智
罗启荣
李敬
丁宇洁
张南韵
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贵州南源电力科技开发有限公司
安顺供电局
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Abstract

The invention discloses short-distance measurement method and structure of the grounding resistance of a grounding network. A current pole used for measuring the grounding resistance of the grounding network is arranged near the grounding network to be measured, even inside the grounding network; the current pole is used as a small grounding network to be measured, and the grounding resistance R pole of the current pole is measured by the traditional long-distance measuring method; finally, a test voltage is applied between the grounding networking to be measured and the current electrode, a test current between the grounding network to be measured and the current pole is measured by an ampere meter, and the total grounding resistance R (total) of the grounding network to be measured and the current pole is calculated by using the Ohm's law; and the grounding resistance R pole of the current pole is subtracted from the R (total) to obtain the grounding resistance R (network) of the grounding network to be measured. The invention not only can avoid the problems of long wire pay-off distance, large work load, easy interference production and the like, but also can avoid the technical difficulty that the measurement precision of the traditional short-distance measurement method can not satisfy actual requirements.

Description

The measuring method of short distance Grounding Resistance Measurement and measurement structure thereof

Technical field

The present invention relates to a kind of measuring method and measurement structure thereof of stake resistance, belong to the indirect short distance field of measuring technique of stake resistance.

Background technology

In the method for existing Grounding Resistance Measurement, then can be divided into length apart from method and short distance method by electric current utmost point unwrapping wire apart from dividing, its fundamental measurement theory is summarized as follows:

Be illustrated in fig. 2 shown below; When behind call through test power supply between the tested earth mat and the electric current utmost point, then between grounded screen, the electric current utmost point, the earth and lead, constitute a closed-loop path, thereby will have current i to flow through in the earth; This electric current will produce voltage and distribute on the face of land; Earth potential distribution curve from figure can be found out, because the existence of the electric current utmost point makes the zero potential surface of infinite distant place be moved to certain position between the earth mat and the electric current utmost point; Its accurate location and concrete soil geologic structure and earth mat structural parameters are closely bound up, and therefore how accurately finding this zero-potential point A promptly is the key that can various measuring methods successful.

Long minimum 4~5 times of reaching the earth mat diagonal-size of distance that require the electric current utmost point and tested ground network edge apart from method; And theoretically this distance the longer the better; Because the electric current utmost point is far away more; Then its earth potential smooth section of falling in the middle of the curve is obvious more, also just finds earth potential zero point through trial method more easily.Existing short distance rule is to be based upon on the basis of computer numerical calculating, through entities such as grounded screen and soil media are set up numerical value or equivalent model, finds the solution soil distribution of current equation to confirm the earth potential position at zero point with computer software then.

Long respectively have relative merits apart from method and short distance method; Length has realized grounding resistance is measured comparatively accurately apart from method, but because its unwrapping wire distance is too far away, workload is big; Particularly in the area, mountain area; Operate extremely difficultly, and long measuring lead wire also can increase mushing error, though the influence that measuring methods such as 30 ° of angle-off sets of being derived by it or reverse method can suppress to disturb through technological means to a certain extent; But its heavy operating process is still the problem that the field engineering technician has to face; Even if yet there are many drawbacks in length apart from method, because present existing short distance measuring method is ripe not enough technically, therefore up-to-date earth mat detects rules and still recommends to use length apart from method stake resistance to be measured.

The theoretical foundation of existing short distance measuring method all is on the accurate foundation that is based upon earth mat and soil texture model, therefore also has many difficulties technically, mainly contains following 2 points:

1, the short distance method requires over the ground the web frame parameter to carry out accurate modeling.This is undoubtedly very difficult in reality; Because receive many factor affecting; Web frame mostly has very big difference with construction drawing practically, particularly for some operations earth mat of the remote past, owing to reasons such as corrosion; Web frame can great changes will take place on ground, and these all can bring very mistake to the foundation of giving the ground pessimistic concurrency control.

2, the short distance method is taked the equivalent model processing mode to actual soil texture when calculating the surface potential distribution, and promptly bilayer or the multilayer soil texture with equivalence replaces actual soil.This processing mode itself is exactly not rigorous, because so-called " equivalence " is actually to by the entity beyond the equivalent, is illustrated in fig. 3 shown below; After the equivalence of the soil texture of regional A is double-decker; P for beyond the regional A is ordered, and its surface potential can not change, but then different for being positioned at the inner Q point of regional A; Its surface potential must be inequality before and after equivalence; And all short distance measuring methods have all carried out equivalent process with the soil between the earth mat and the electric current utmost point at present, and the zero-potential point that is therefore calculated must be positioned at the inside of equivalent soil model, thereby will inevitably cause the error of calculation.

Summary of the invention

The technical matters that the present invention will solve is: provide that a kind of measuring operation is simple, quick, cost is low, the measured value measuring method and the measurement structure thereof of short distance Grounding Resistance Measurement accurately, can overcome the deficiency of prior art.

The method of short distance Grounding Resistance Measurement is accomplished by following step:

A, near tested grounded screen, select smooth landform to arrange the electric current utmost point that is used to measure its stake resistance;

B, artificially regard this electric current utmost point as tested grounded screen, and apart from mensuration the electric current utmost point is carried out grounding resistance measurement, measure the stake resistance R of the electric current utmost point by routine length The utmost point

C, between the tested grounded screen and the electric current utmost point, apply trial voltage, measure through the test current between the tested grounded screen and the electric current utmost point, utilize Ohm law to calculate the stake resistance sum R of the tested grounded screen and the electric current utmost point with reometer Always

D, with R AlwaysDeduct the stake resistance R of the electric current utmost point The utmost pointCan obtain the resistance value R of tested grounded screen Net

Electric current utmost point physical dimension generally is no more than 5m.

The electric current utmost point is arranged on the zone of being convenient to implement measuring operation in the tested grounded screen 50m scope.

When the electric current utmost point that is provided with was carried out grounding resistance measurement, because the extremely physical dimension of this electric current own is arranged in the 5m, its maximum unwrapping wire distance was smaller or equal to 50m.

The measurement structure of short distance Grounding Resistance Measurement; It comprises tested grounded screen; In the 0-50m of tested grounded screen scope, the electric current utmost point is set, in the 15-50m of electric current utmost point scope, the auxiliary current utmost point is set, and the mobile test power supply connects the two ends of the tested grounded screen and the electric current utmost point and the two ends of the electric current utmost point and the auxiliary current utmost point respectively; The test current in loop is flow through in reometer and the test of mobile test power series, and the voltage table test node voltage and the electric current utmost point are with respect to the voltage of the earth zero-potential point.

The catercorner length of the electric current utmost point is smaller or equal to 5m.

Compare with prior art; The present invention with the electric current utmost point as tested small connect ground net; And apart from the requirement of mensuration the electric current utmost point is carried out grounding resistance measurement by long; Because of tested electric current utmost point physical dimension generally is set in the 5m, so even if by long distance it is carried out grounding resistance measurement, required maximum unwrapping wire distance also need not surpass 50m can satisfy the measuring accuracy requirement; Make and under environment with a varied topography, that unwrapping wire is difficult, be convenient to measuring operation, so just can accurately measure the stake resistance R of the electric current utmost point The utmost pointSimultaneously for tested grounded screen, between itself and the electric current utmost point, apply under the situation of certain measuring voltage, can accurately measure the test current on the loop, utilize Ohm law just can calculate the stake resistance sum R of the tested earth mat and the electric current utmost point Always, use R at last AlwaysDeduct R The utmost pointJust can draw the grounding resistance R of tested grounded screen NetAdopt the method not only can avoid tradition length big, be prone to produce problems such as interference, and can avoid existing short distance measuring method to measure not accurate enough technical matters apart from mensuration unwrapping wire distance, workload.Whole test process does not need extras simultaneously, and is simple to operate, has excellent popularization and applied value.

Technological means of the present invention is compared with existing mensuration and is also had following characteristics simultaneously

The correctness of final testing result does not receive electric current to have the influence of body position.Therefore can the electric current utmost point be arranged near the tested earth mat even inner at earth mat, as long as it does not contact with tested grounded screen.

In measure R The utmost pointThe time, can adopt conventional length to measure to guarantee result's correctness apart from method.And because the size very little with respect to tested earth mat (being no more than 5m usually) of the electric current utmost point, even therefore the unwrapping wire distance is amplified to 10 times of electric current utmost point diagonal-size, its unwrapping wire distance also only needs about 50m.

Because the particular location of the electric current utmost point does not influence the correctness of measurement result, therefore can according to field condition with its be arranged on that physical features is smooth, geology zone uniformly, be convenient for measuring operation.

Whole test process does not need extras, and is simple to operate.

It is long apart from method of testing to compare tradition, because R AlwaysWith R The utmost pointMeasuring process need not grow apart from unwrapping wire, so this method has realized that indirectly the short distance of stake resistance measures.

Description of drawings

Fig. 1 is a test philosophy synoptic diagram of the present invention;

The schematic diagram that Fig. 2 measures for Resistance of Grounding Grids;

Fig. 3 produces schematic diagram for the main error of existing short distance measuring method.

Embodiment

As shown in Figure 1; At first principle of the present invention is made an explanation; When after energized between the tested grounded screen 1 and the electric current utmost point 2, because the existence of the electric current utmost point 2 makes the zero potential surface of infinite distant place be moved to certain position between the tested grounded screen 1 and the electric current utmost point 2.This conclusion is undoubtedly strict establishment, and is irrelevant with the distance of the electric current utmost point 2 present positions, as long as the electric current utmost point 2 does not have directly with tested grounded screen 1 and contacts.Measuring current i is flowing to via the earth in the process of the electric current utmost point through grounded screen, and all electric current lines are inevitable all can to pass this zero potential surface.Definition by stake resistance can be known; When measuring current i flow to zero potential surface by tested grounded screen; The resistance that it ran into is the stake resistance of tested grounded screen 1, and in like manner when i flow to the electric current utmost point 2 by zero potential surface, the resistance that is run into was the stake resistance of the electric current utmost point 2.Therefore the R that obtains divided by test current with trial voltage AlwaysBe the stake resistance sum of the tested earth mat and the electric current utmost point, i.e. R Always=R Net+ R The utmost point, this conclusion also is strict the establishment undoubtedly, and is irrelevant with the distance of the electric current utmost point 2.

Under the prerequisite of clear and definite above-mentioned theory, we are earlier to R AlwaysMeasure, the concrete measurement adopted following steps

A, location arrangements is used for the electric current utmost point 2 of Grounding Resistance Measurement near tested grounded screen 1; The electric current utmost point 2 generally is arranged in the zone that near tested earthing electric network (in the 50m scope) is convenient to implement measuring operation, and the catercorner length of the electric current utmost point 2 is smaller or equal to 5m

B, with the electric current utmost point 2 as tested small connect ground net, and apart from mensuration the auxiliary current utmost point 3 is set, and apart from the requirement of method the electric current utmost point 2 is carried out grounding resistance measurement by long by tradition length, obtain its stake resistance R The utmost pointLess because of the physical dimension of the electric current utmost point 2, even if measure apart from method by tradition is long, its maximum unwrapping wire distance also need not surpass 50m.When measuring; The mobile test power supply connects tested grounded screen 1 and the two ends of the electric current utmost point 2 and the two ends of the electric current utmost point 2 and the auxiliary current utmost point 3 respectively; Reometer and mobile test power series; Be used for testing the test current that flows through the loop, voltage table is used for test node voltage and the electric current utmost point 2 voltage with respect to the earth zero-potential point.

C, between the tested grounded screen 1 and the electric current utmost point 2, apply trial voltage, measure the test current between the tested grounded screen 1 and the electric current utmost point 2, utilize Ohm law to calculate the stake resistance and the R of tested grounded screen 1 and the electric current utmost point 2 with reometer Always

D, utilize the stake resistance sum R of tested grounded screen 1 and the electric current utmost point 2 AlwaysDeduct the stake resistance R of the electric current utmost point 2 The utmost pointCan obtain the grounding resistance R of tested grounded screen Net

Claims (2)

1. the method for a short distance Grounding Resistance Measurement, it is characterized in that: this method is accomplished by following step:
A, near tested grounded screen, select smooth landform to arrange the electric current utmost point that is used to measure its stake resistance;
B, artificially regard this electric current utmost point as tested grounded screen, and apart from mensuration the electric current utmost point is carried out grounding resistance measurement, measure the stake resistance R of the electric current utmost point by routine length The utmost point
C, between the tested grounded screen and the electric current utmost point, apply trial voltage, measure through the test current between the tested grounded screen and the electric current utmost point, utilize Ohm law to calculate the stake resistance sum R of the tested grounded screen and the electric current utmost point with reometer Always
D, with R AlwaysDeduct the stake resistance R of the electric current utmost point The utmost pointCan obtain the resistance value R of tested grounded screen Net
Electric current utmost point physical dimension generally is no more than 5m; The electric current utmost point is arranged on the zone of being convenient to implement measuring operation in the tested grounded screen 50m scope; When the electric current utmost point that is provided with was carried out grounding resistance measurement, because the extremely physical dimension of this electric current own is arranged in the 5m, its maximum unwrapping wire distance was smaller or equal to 50m.
2. measurement structure that adopts the method for playlet Grounding Resistance Measurement as claimed in claim 1; It comprises tested grounded screen (1); It is characterized in that: the electric current utmost point (2) is set in the 0-50m scope of tested grounded screen (1); The auxiliary current utmost point (3) is set in the 15-50m scope of the electric current utmost point (2); And the mobile test power supply connects tested grounded screen (1) and the two ends of the electric current utmost point (2) and the two ends of the electric current utmost point (2) and the auxiliary current utmost point (3) respectively; The test current in loop is flow through in reometer and the test of mobile test power series, and the voltage table test node voltage and the electric current utmost point (2) are with respect to the voltage of the earth zero-potential point, and the catercorner length of the electric current utmost point (2) is smaller or equal to 5m.
CN201010185450A 2010-05-28 2010-05-28 Short-distance measurement method and structure of grounding resistance of grounding network CN101825662B (en)

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CN105785134A (en) * 2016-03-17 2016-07-20 中国地质科学院地球物理地球化学勘查研究所 Non-polarized electrode grounding resistance measurement method

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CN102435854A (en) * 2011-09-21 2012-05-02 安徽省电力公司巢湖供电公司 Improved method for measuring impulse grounding resistance of electric power system
CN105445560A (en) * 2015-11-26 2016-03-30 国家电网公司 Grounding resistor tester measurement method based on ZC-8 type
CN106597213B (en) * 2016-11-11 2019-11-19 华北电力大学(保定) Distributed electric line upkeep operation safeguard protection digitized monitoring system
CN107490725A (en) * 2017-08-04 2017-12-19 上海建科检验有限公司 The pole method of testing of special industry place grounding resistance three
CN107843784B (en) * 2017-10-27 2019-10-11 国网陕西省电力公司电力科学研究院 A kind of large-scale grounding network high frequency characteristics test method to be flowed back using earth mat
CN108445297A (en) * 2018-04-18 2018-08-24 中国石油天然气集团有限公司 The monitoring method and system of Resistance of Grounding Grids

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