CN105425049A - Method of testing geodetic network earthing resistance - Google Patents
Method of testing geodetic network earthing resistance Download PDFInfo
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- CN105425049A CN105425049A CN201510724588.XA CN201510724588A CN105425049A CN 105425049 A CN105425049 A CN 105425049A CN 201510724588 A CN201510724588 A CN 201510724588A CN 105425049 A CN105425049 A CN 105425049A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
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- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a method of testing geodetic network earthing resistance, comprising the steps of: first, making an earthing network formed by earthing resistance equivalent to a pure resistance network, each segment of conductor representing a resistor; then, injecting current into the earthing network through an underground lead wire, collecting corresponding port data, calculating the port resistance between two earthing lead wires, and obtaining the resistance value of each segment of conductor; and finally, comparing the resistance value with a complete resistance value to obtain the corrosion degree and breakpoint case of an earthing network conductor. The method can accurately calculate the resistance between any two points in earthing resistance grid resistors, so as to accurately determine which segment of resistor breaks down, perform accurate excavation through a calculated resistance distribution case, and not waste manpower and material resources.
Description
Technical field
The present invention relates to earth resistance technology, particularly relate to the method for test geodetic network stake resistance.
Background technology
Ground networks is that multiple grounding body ground connection main line is connected into network, has ground connection reliable, the feature that stake resistance is little, is applicable to the needs of a large amount of electrical equipment grounding, at present, uses in a large number in transformer station.
Substation grounding is at present by measurement of Grounding Resistance and step voltage, and the defect of contact electricity assessment grounded screen, effectively can not find that the corrosion condition, particularly breakpoint of grounded screen can not effectively find.
Current inspection Grounding Grid is generally by excavation, and check the corrosion condition of excavation point, but can not find some local defect, its workload is unfavorable for greatly safe operation, excavates out simultaneously and can provide sufficient oxygen, have the possibility of accelerated corrosion.
Run more than 10 years transformer station's quantity many, there is the defect hidden danger of corroding and causing, in the urgent need to effective Examination and diagnosis.
Summary of the invention
Technical matters to be solved by this invention is just to provide a kind of method of testing geodetic network's stake resistance, overcome the corrosion condition that effectively can not find now grounded screen, breakpoint can not effectively find, clearly can not see the distribution of impedance situation of each point of earth mat, thus need dig on a wide area to find Grounding Grid situation.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of method of testing geodetic network's stake resistance, comprises the steps:
First, the grounded screen that stake resistance forms is equivalent to pure resistance network, and each section of conductor represents a resistance;
Then, corresponding port data are gathered to grounded screen Injection Current by ground lead, can be calculated the port resistive between two ground leads, wherein port resistive is R2, port side grid resistance is equivalent to R1, and port opposite side grid resistance is equivalent to R3 and R4, and the voltage applied in port is Vs, the electric current being diverted to both sides grid is respectively i1 and i2, then draw
Grid 1:Vs-i1R1-(i1-i2) R2=0
Grid 2:-(i2-i1) R2-i2R3-i2R4=0
Drawn further by above-mentioned formula
(R1+R2)i1-R2i2＝Vs
-R2i+(R2+R3+R4)i2＝0
Carry out calculating the electric current and voltage that flow through R2 according to the electric current applied and magnitude of voltage, thus calculate the value of R2; Repeat the resistance value that said process just can obtain each section of conductor;
Finally, by this resistance value and intact time resistance value compare the extent of corrosion and breakpoint situation that just can obtain grounding grids.
Further, be multiplied by a coefficient again divided by the value that intact resistance obtains and obtain recording resistance value the percentage that one is used for evaluating stake resistance corrosion condition.
Further, be depicted as the grid pattern of simulation pure resistance network by measurement data, each Marking the cell goes out the corrosion condition of corresponding stake resistance.
Further, by the respective level of the rectangular grid mark stake resistance corrosion of different colours.
The grid distribution plan that the present invention is original according to earth mat, a voltage source is added wherein between two points, and in network resistor high current source, measured resistance section side, so just, the direction of current flowing through measured resistance section can be judged, and because both sides add electric current in the same way, therefore mesh current can be utilized as unique variable, and recycling Kirchhoff's second law is listed system of equations and is calculated measured resistance.
Therefore, the present invention can calculate the resistance between any two points in stake resistance grid resistance accurately, therefore judge that problem has appearred in which section resistance accurately, can be excavated accurately by the distribution of resistance situation calculated, too much manpower and materials need not be wasted.The method is utilized no matter to be that minimizing workload or the safe operation of transformer station are helpful all greatly.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 is elementary diagram;
Fig. 2 is metering circuit schematic diagram;
Fig. 3 is the ground networks resistive corrosion figure be depicted as according to measurement data.
Embodiment
As shown in Figure 1, first, grounded screen is equivalent to pure resistance network, each section of conductor represents a resistance, gathers corresponding port data, can be calculated the port resistive between two ground leads by ground lead to grounded screen Injection Current or voltage.
Concrete measurement mechanism comprises surveying instrument 22, current source 21, grounded screen 11, ground lead 13, matches criteria resistance R, better can be measured the port resistive of earth mat by this measurement mechanism.
As shown in Figure 2, mesh current direction is that whole grounded screen can be divided into n grid, m current source clockwise, n-m independent equation can be arranged, i.e. n-m independence mesh current, wherein port resistive is R2, and port side grid resistance is equivalent to R1, port opposite side grid resistance is equivalent to R3 and R4, the voltage applied in port is Vs, and the electric current being diverted to both sides grid is respectively i1 and i2
To each grid application KVL containing unknown current
Grid 1:Vs-i1R1-(i1-i2) R2=0
Grid 2:-(i2-i1) R2-i2R3-i2R4=0
That is: (R1+R2) i1-R2i2=Vs
-R2i+(R2+R3+R4)i2＝0
Wherein, R3, R4 are build-out resistors, namely additional known resistance, and i1, i2 are that gained measured by surveying instrument; Carry out calculating the electric current and voltage that flow through R2 again according to the current source 21 that adds, thus calculate the value of R2, this process is by surveying instrument computing certainly, obtains the value of R2, current value.
Then, then the topological structure of port resistive and grounded screen input diagnostic analysis software is obtained the resistance value of each section of conductor, finally by this resistance value and intact time resistance value compare the extent of corrosion and breakpoint situation that just can obtain grounding grids.
Specifically be multiplied by a coefficient again divided by the value that intact resistance obtains obtain the percentage being used for evaluating by recording resistance value, wherein, coefficient is calculated by the program in analysis software, is analyzed by digital-to-analog conversion and the analysis determining program that weaves in single-chip microcomputer in advance.
The meaning of coefficient is the extent of corrosion that can calculate geodetic network, and can judge whether needs to administer, and is convenient to propose resolution; The words of computational algorithm are the modes by mathematical modeling, carry out coding according to the regulation in DL/T596-1996 " power equipment preventive trial code ", DL/T621-1997 " ground connection of alternating-current electric device ", GB50169-2006 erection works of electrical installations code for construction and asseptance of earthed devices; Mathematical relation between earth mat each section of conductor resistance value and earth mat ground lead between electric parameter is a nonlinear relationship. alternative manner must be adopted to solve, this just involves Iteration and the convergence problem of algorithm. and the independent data usually measuring electric parameter between the ground lead obtained is less than the conductor number of earth mat, therefore must consider the Solve problems owing to determine nonlinear equation.Due to earth mat each section of conductor resistance change caused by ground lead between the change of electrical parameters not fairly obvious, therefore its result of calculation is very responsive to survey t error, this is a Very Ill-conditioned problem theoretically, and certain method must be taked to be overcome.Reduce result of calculation to the susceptibility of measuring error. always there is the concrete conditions such as error in measured value in addition, need set up a kind of quick and precisely, anti-throat acoustic energy power is strong, the computing method that effectively can overcome matrix morbid state shadow noon.
Vb=[Vb1, Vb2 ... Vbb] be branch voltage vector;
Ib=[Ib1 ... Ibb] be branch current vector;
If when certain branch resistance of network is changed to R ' by R=Vb/Ib, R'=R+ △ R; According to the extensibility therefore according to network, the Ra of the R ' calculated and side network can be contrasted, coefficient n=R '/Ra, coefficient value is lower, and just to represent corrosion condition lower.
As shown in Figure 3, further, measurement data is depicted as figure, by the corrosion condition finding out earth mat that figure is blunt, in figure, rectangular grid colors available is distinguished, and the rectangular grid without color represents corresponding corrosion condition.
The present invention adopts Electrical network analysis method, in conjunction with supplementary features amount parameter recognition technology, utilizes existing down conductor to measure.When not excavating, reach the corrosion quantitative test to grounded screen, draw the data of extent of corrosion, and draw distribution plan, very clear, effectively can solve the defect analysis problem of existing grounding net of transformer substation, the present invention effectively can find the defect of grounded screen local, and as pad fracture, grounding body is because of the obvious deficiency of corroded area etc., by setting up archives, provide foundation accurately to Efficient Evaluation ground net corrosion degree from now on.
Claims (4)
1. test a method for geodetic network's stake resistance, it is characterized in that comprising the steps:
First, the grounded screen that stake resistance forms is equivalent to pure resistance network, and each section of conductor represents a resistance;
Then, corresponding port data are gathered to grounded screen Injection Current by ground lead, can be calculated the port resistive between two ground leads, wherein port resistive is R2, port side grid resistance is equivalent to R1, and port opposite side grid resistance is equivalent to R3 and R4, and the voltage applied in port is Vs, the electric current being diverted to both sides grid is respectively i1 and i2, then draw
Grid 1:Vs-i1R1-(i1-i2) R2=0
Grid 2:-(i2-i1) R2-i2R3-i2R4=0
Drawn further by above-mentioned formula
(R1+R2)i1-R2i2＝Vs
-R2i+(R2+R3+R4)i2＝0
Carry out calculating the electric current and voltage that flow through R2 according to the electric current applied and magnitude of voltage, thus calculate the value of R2; Repeat the resistance value that said process just can obtain each section of conductor;
Finally, by this resistance value and intact time resistance value compare the extent of corrosion and breakpoint situation that just can obtain grounding grids.
2. a kind of method of testing geodetic network's stake resistance according to claim 1, is characterized in that: be multiplied by a coefficient again divided by the value that intact resistance obtains and obtain recording resistance value the percentage that one is used for evaluating stake resistance corrosion condition.
3. a kind of method of testing geodetic network's stake resistance according to claim 1, is characterized in that: the grid pattern being depicted as simulation pure resistance network by measurement data, each Marking the cell goes out the corrosion condition of corresponding stake resistance.
4. a kind of method of testing geodetic network's stake resistance according to claim 3, is characterized in that: by the respective level of the rectangular grid mark stake resistance corrosion of different colours.
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| CN201510724588.XA CN105425049A (en) | 2015-10-29 | 2015-10-29 | Method of testing geodetic network earthing resistance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152597A (en) * | 2018-01-05 | 2018-06-12 | 重庆大学 | A kind of earthing pole etch state diagnostic device and method based on relative to ground resistance |
| CN109580463A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A method of measurement ground net corrosion degree |
| CN113504411A (en) * | 2021-06-29 | 2021-10-15 | 合肥工业大学 | Large-scale grounding grid grounding resistance multi-factor evaluation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152597A (en) * | 2018-01-05 | 2018-06-12 | 重庆大学 | A kind of earthing pole etch state diagnostic device and method based on relative to ground resistance |
| CN108152597B (en) * | 2018-01-05 | 2020-07-31 | 重庆大学 | Grounding electrode corrosion state diagnosis device and method based on relative grounding resistance |
| CN109580463A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A method of measurement ground net corrosion degree |
| CN109580463B (en) * | 2018-11-22 | 2021-08-20 | 国网天津市电力公司电力科学研究院 | Method for measuring corrosion degree of grounding grid |
| CN113504411A (en) * | 2021-06-29 | 2021-10-15 | 合肥工业大学 | Large-scale grounding grid grounding resistance multi-factor evaluation method |
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Application publication date: 20160323 |
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