CN114113793A - Apparatus and method for measuring resistivity of flat-strip copper-clad steel - Google Patents
Apparatus and method for measuring resistivity of flat-strip copper-clad steel Download PDFInfo
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- CN114113793A CN114113793A CN202010881987.8A CN202010881987A CN114113793A CN 114113793 A CN114113793 A CN 114113793A CN 202010881987 A CN202010881987 A CN 202010881987A CN 114113793 A CN114113793 A CN 114113793A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- 239000010949 copper Substances 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 description 15
- 239000004020 conductor Substances 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004832 voltammetry Methods 0.000 description 1
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a device and a method for measuring the resistivity of flat-band copper-coated steel, which comprises the following steps of firstly manually measuring the interface parameters of the copper-coated steel and inputting the interface parameters into a data processing platform, wherein the device comprises a current generator used for generating current with certain amplitude and injecting the current into a tested copper-coated steel sample; the ammeter is connected with the test sample in series through the annular clamp and is used for detecting the current amplitude flowing through the copper-coated steel test sample and transmitting the current value to the data processing platform; the voltmeter is connected with the test sample in parallel through the annular clamp and is used for measuring the voltage value between two points of the copper-coated steel test sample and transmitting the voltage value to the data processing platform; and the photoelectric sensor is used for detecting the distance between the annular clamps and transmitting the numerical value to the data processing platform, and the data processing platform can calculate and process each data to obtain the resistivity numerical value of the flat-band copper-clad steel sample. The invention also discloses a method for measuring the resistivity of the flat-strip copper-clad steel.
Description
Technical Field
The invention relates to the field of measurement of materials of grounding bodies such as power systems and electrical devices, in particular to a device and a method for measuring the resistivity of flat-band copper-coated steel.
Background
At present, the development of an electric power system is rapid, a new requirement is put forward on the operation stability of the electric power system along with the proposal of an energy Internet concept, and the importance of a grounding body as a common ground point of each electric power device and a medium for fault current and lightning current to enter the ground is self-evident.
Before a material is used as a grounding body, the material itself needs to be subjected to a type test so as to meet the use condition of the material under a specific use environment. When the grounding material is applied to the lightning protection grounding field of an electric power system, specific technical conditions in the grounding field need to be met, in order to achieve the technical conditions, whether tests can refer to national standards or industrial standards of similar products or not, whether test results are convincing or not, and the like are all problems that the grounding material needs to be solved before actual grounding application.
The accurate measurement of the conductivity of the grounding material is the key of theoretical analysis and calculation and practical engineering application of the grounding material.
The flat-band copper-clad steel grounding material is widely applied to grounding body laying in recent years due to the advantages of excellent conductivity, corrosion resistance, flexibility, bending resistance, strong tensile strength and the like, and is a material with good conductivity. In the electrical property test of the flat-belt copper-clad steel grounding material, the accurate measurement of the resistivity of the flat-belt copper-clad steel grounding material is a precondition for evaluating the conductivity of the novel grounding material and realizing the grounding application of the novel material.
Common resistance measurement methods include voltammetry, wheatstone bridge method, quadrupole method modified from bridge method, and the like. Because the resistivity of the graphite composite grounding body is grounded by the metal conductor, an electric bridge method or a quadrupole method is needed for accurately measuring the grounding quantity. However, when the former is used for measuring a low-value resistance (generally less than 1 ohm), because the measured low-value resistance is used as a bridge arm, additional resistances such as a lead and a contact resistance in the bridge arm may be in the same order of magnitude as the measured low-value resistance, and even higher than the resistance of the low-value resistance to be measured, the measured value of the low-value resistance is larger, and the accuracy is not high, therefore, a new improved measurement method needs to be provided for measuring the resistivity of the ribbon type copper-clad steel grounding material to improve the measurement accuracy.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the resistivity of flat-band copper-clad steel, which are based on the traditional four-pole resistance measuring principle and have the advantages of simple and convenient measurement, labor saving, time saving, high efficiency, strong operability, high measuring precision and the like.
The invention is carried out by the following technical scheme:
the resistivity of the flat-strip copper-clad steel is measured according to the formula R as pl/s,
wherein R is the resistance value of the conductor, rho is the resistivity of the conductor, l is the length of the conductor, and s is the cross-sectional area of the conductor. Therefore, for a conductor with a non-changed cross section, the resistivity measurement work can be carried out by applying the formula. Please refer to fig. 1, fig. 2 and fig. 3 to examine the contents of the present invention.
To the copper of bandlet type cover steel matter grounding body, its conductor cross section is the rectangle, selects a section of bandlet type copper that length is fit for to cover steel and carries out test work, and current generator outputs the electric current of certain amplitude and flows through bandlet type copper and covers the steel sample, and the voltmeter passes through anchor clamps and bandlet type copper and covers steel sample zonulae occludens, and when the electric current flows through the sample, can detect voltage value through the ampere meter, and the electric current value and the voltage value that will detect pass through transmission line transmission to data processing platform alright calculate the sample section resistance value under this kind of condition. In order to obtain the resistivity value of the flat-strip copper-coated steel, the length of the sample, the cross-sectional area parameters of the sample conductor and the like are input into a data processing platform, the length of the sample is detected by a photoelectric sensing strip fixed on a test platform, and a dense photoelectric sensor arranged on the photoelectric sensing strip can detect the distance between two clamps for voltage measurement and transmit the distance to the data processing platform. The cross-sectional area of the sample is manually input into a data processing platform, and comprises the length and the width of the conductor cross section, and the data processing platform calculates the cross-sectional area of the conductor to be used for calculating the resistivity of the sample conductor.
A further improvement of the invention is that all tests are carried out in a 20 ℃ dry room environment in order to eliminate the effect of the temperature at which the measurements are carried out on the results of the resistivity test.
The invention further improves the current input end, the current output end and the two voltage measuring ends, and the internal resistance of the measuring lead and the contact resistance R of the four clamp terminals and the copper-coated steel sample exist during measurement+. When measuring the resistance R of the grounding body with a certain length, because the input impedance of the voltmeter is very large, the current passing through the voltmeter is almost zero, the two voltage measuring ends do not generate shunting, and the reading of the ammeter is the accurate value of the current passing through the grounding body. In addition, the contact resistance R of the voltage measuring terminal+And the voltage measurement value Ux is an accurate value of the voltage at two ends of the grounding body, and the internal resistance of the voltmeter can be ignored. The resistivity of the grounding body can be obtained by accurately measuring the voltage and the current of the sample and the section size of the flat-band type copper-clad steel.
The invention is further improved in that cross section parameters of the copper-clad steel are measured by using a vernier caliper at multiple points before testing, and an average value is obtained for subsequent input into a data processing platform.
The invention is further improved in that the test sample is selected to be flat-band copper-coated steel under the same preparation condition, and the selection of the clamp has certain influence on the measurement result. Although the influence of contact resistance can be avoided if a conventional terminal is used to directly hold a conductor, slight changes in the holding state cause the measurement result to slightly float. Therefore, when the resistivity of the sample is tested, the annular clamp is adopted, and the annular clamp is ensured to be uniformly fixed in the circumferential direction during measurement, so that the variance of the measurement result is small, and the stability is good. When the resistivity of the copper-clad steel with different section sizes needs to be measured, the clamps with different section sizes can be replaced selectively, so that the clamps can be in close contact with the copper-clad steel, and the contact resistance is reduced as much as possible.
The invention is further improved in that the distance between the current end and the voltage end is more than 100mm and the distance between the two voltage ends is more than 600mm in order to ensure the uniformity of the current density. The sample needs to be placed on the horizontal insulating plate in a straight line and fixed. During measurement, 4 ring clamps are clamped, 3 of the ring clamps are fixed, the rest 1 ring clamp is moved, different measured resistances are sequentially obtained, a plurality of groups of resistivity data are correspondingly obtained, and the average value is taken for measurement to serve as the resistivity of the flat-band copper-clad steel.
A further development of the invention is that the distance 1 between the two ring clamps at the voltage measuring end during measurement is measured by a photoelectric sensor arranged below the test specimen and transmitted to the data processing platform.
The invention has the following beneficial effects:
in the measurement of the resistivity of the flat-band copper-clad steel, a highly integrated data processing platform is applied to summarize and process the measured data, so that the data processing workload of workers can be reduced. The annular fixture is selected to clamp and measure the flat-band copper-clad steel, so that the contact resistance in the measurement work can be greatly reduced, and powerful guarantee is provided for the data accuracy. The photoelectric sensor is selected to measure the distance between 4 clamps in the measurement work, so that the efficiency and the precision are high. The data processing platform processes the distance signal, the voltage signal, the current signal and the copper-clad steel section parameter, so that the resistivity parameter of the copper-clad steel sample can be automatically calculated, and the method is efficient and accurate.
Drawings
FIG. 1 is a diagram showing the configuration of an apparatus for measuring the resistivity of a flat strip copper-clad steel;
FIG. 2 is a schematic cross-sectional view of a flat-strip copper clad steel;
FIG. 3 is a ring clamp clamped on a flat band type copper clad steel during measurement;
in fig. 1: the device comprises a 1-current input end clamp, a 2-voltage test clamp A, a 3-voltage test clamp B, a 4-current output end clamp, a 5-flat strip type copper-coated steel sample, a 6-photoelectric sensing strip, a 7-ammeter, an 8-voltmeter, a 9-current generator and a 10-data processing platform.
Detailed Description
Example 1
And (3) carrying out interface parameter measurement on the flat strip type copper-coated steel sample (5) by using a vernier caliper, measuring the section length iota to be 30mm and the section width d to be 15mm, and manually inputting the section data of the copper-coated steel into a data processing platform (10). Current regulating generator(9) For a proper measuring range, the measured data of an ammeter (7) is I100A, the distance L between two ring clamps (2) and (3) at a voltage measuring end is adjusted to be 1000mm, the measured data of a voltmeter (8) is U0.0176V, and the current value and the voltage value are automatically transmitted to a data processing platform (10). The data processing platform (10) automatically calculates the resistivity of the sample according to the formula rho SR/L iota dU/IL to obtain the resistivity of the sample of 7.92 multiplied by 10-8Ωm。
Example 2
And (3) carrying out interface parameter measurement on the flat strip type copper-coated steel sample (5) by using a vernier caliper, measuring the section length iota to be 30mm and the section width d to be 10mm, and manually inputting the section data of the copper-coated steel into a data processing platform (10). The current generator (9) is adjusted to be a proper range, the measured data of the ammeter (7) is I (150A), the distance between two ring clamps at the voltage measuring end L (2) and (3) is adjusted to be 800mm, the measured data of the voltmeter (8) is U (0.02688V), and the current value and the voltage value are automatically transmitted to the data processing platform (10). The data processing platform (10) automatically calculates the resistivity of the sample according to the formula rho SR/L iota dU/IL to obtain the resistivity of the sample of 6.72 multiplied by 10-8Ωm。
The above embodiments are only preferred embodiments, and do not limit the present invention, and all the simple modifications, changes and equivalent structural changes of the above embodiments are within the protection scope of the technical solution of the present invention.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010881987.8A CN114113793A (en) | 2020-08-27 | 2020-08-27 | Apparatus and method for measuring resistivity of flat-strip copper-clad steel |
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| CN202010881987.8A CN114113793A (en) | 2020-08-27 | 2020-08-27 | Apparatus and method for measuring resistivity of flat-strip copper-clad steel |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513111A (en) * | 2013-09-06 | 2014-01-15 | 国家电网公司 | System and method for testing electric conductivity of metal wire |
| CN103777078A (en) * | 2012-10-19 | 2014-05-07 | 远东电缆有限公司 | Cable conductor DC-resistance testing device and testing method |
| CN108957134A (en) * | 2017-05-20 | 2018-12-07 | 广东韶钢松山股份有限公司 | A kind of measurement method of copper clad steel gren rod conductivity |
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- 2020-08-27 CN CN202010881987.8A patent/CN114113793A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777078A (en) * | 2012-10-19 | 2014-05-07 | 远东电缆有限公司 | Cable conductor DC-resistance testing device and testing method |
| CN103513111A (en) * | 2013-09-06 | 2014-01-15 | 国家电网公司 | System and method for testing electric conductivity of metal wire |
| CN108957134A (en) * | 2017-05-20 | 2018-12-07 | 广东韶钢松山股份有限公司 | A kind of measurement method of copper clad steel gren rod conductivity |
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Application publication date: 20220301 |