CN111190071B - Rogowski coil testing device and testing method thereof - Google Patents
Rogowski coil testing device and testing method thereof Download PDFInfo
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- CN111190071B CN111190071B CN201911031795.1A CN201911031795A CN111190071B CN 111190071 B CN111190071 B CN 111190071B CN 201911031795 A CN201911031795 A CN 201911031795A CN 111190071 B CN111190071 B CN 111190071B
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- 238000012360 testing method Methods 0.000 title claims abstract description 99
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 26
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
- G01R31/013—Testing passive components
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides a Rogowski coil testing device and a testing method thereof, comprising the following steps: the device comprises a current generator, a copper bar, a voltmeter and a PC; the copper bar is of an inverted U-shaped structure, a current output end of the current generator flows in from one end of the copper bar, and flows out from the other end of the copper bar, so that a closed magnetic field is formed in the copper bar; the Rogowski coil to be measured is arranged on the central position in the copper bar and is perpendicular to the magnetic field; the voltmeter is connected with the Rogowski coil to be tested; the voltmeter is also connected with the PC. The invention has low cost, high test accuracy and simple and quick operation, can screen out products with poor anti-interference capability caused by poor manufacturing process, and improves the production control capability and production efficiency of the products.
Description
Technical Field
The invention relates to a testing device of a rogowski coil, in particular to a device for testing anti-interference performance of the rogowski coil and a testing method thereof.
Background
Referring to fig. 1, the conventional method for testing the precision of rogowski coil is as follows: two induction wires led out from the Rogowski coil 1 are connected with the voltmeter 2, alternating current heavy current is conducted on the central axis of the circular ring of the Rogowski coil 1, the display value of the voltmeter 2 is compared with the standard value, and the detection result is considered to be unqualified when the display value exceeds a certain range.
However, in the production of the rogowski coil 1, there are many reasons for the disqualification thereof, such as:
1. The framework design has no compensation adjusting structure;
2. Common plastic is selected, so that the deformation is large;
3. In the injection molding process, the skeleton plane is warped and uneven;
4. uneven enameled wires are arranged in the winding process, and the wires are stacked;
5. The tension in the winding is not well adjusted.
The production and manufacturing reasons not only can lead to poor precision, but also can lead to poor anti-interference capability of products, even if products with qualified primary detection precision are produced, when interference signals appear, the precision can be immediately deteriorated, test results can also be displayed as unqualified, and the rogowski coil must be detached for replacement.
The existing test method cannot screen out products with poor anti-interference capability, so that a device for testing the anti-interference capability of the rogowski coil is designed, the production control capability and the production efficiency of the products are improved, and the problems to be solved are urgent.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a rogowski coil testing device and a rogowski coil testing method, which are used for solving the problems that in the prior art, products with poor anti-interference capability cannot be screened out, and when interference signals occur after assembly, the accuracy will be degraded immediately, and even if the products with qualified initial detection accuracy are displayed as unqualified products.
To achieve the above and other related objects, the present invention provides a rogowski coil test apparatus, comprising: the device comprises a current generator, a copper bar, a voltmeter and a PC;
The copper bar is of an inverted U-shaped structure, a current output end of the current generator flows in from one end of the copper bar, and flows out from the other end of the copper bar, so that a closed magnetic field is formed in the copper bar;
the Rogowski coil to be measured is arranged on the central position in the copper bar and is perpendicular to the magnetic field;
the voltmeter is connected with the Rogowski coil to be tested; the voltmeter is also connected with the PC.
In one embodiment of the present invention, the current generator has a specification of 0-3000A.
In an embodiment of the present invention, a positioning tool is disposed at a central position in the copper bar, and the rogowski coil to be tested is placed on the positioning tool.
In one embodiment of the invention, the voltmeter is a high precision millivolt voltmeter with a communication line.
In an embodiment of the present invention, the voltmeter is connected to two induction wires led out from the rogowski coil to be tested, and the two induction wires are twisted.
The testing method adopted in the testing of the rogowski coil testing device comprises the following steps:
step one: firstly inputting a serial number, a test date and a tester work number of a product to be tested on a PC;
Inputting a test current value I1, test time t1 and interval time t2;
Step two: setting test parameters on the current generator, wherein the test parameters comprise a test current value I1, test time t1 and interval time t2;
step three: placing a product to be tested into a positioning tool of a testing station;
step four: pressing a current output key of the current generator to output a test current value I1, wherein the test current value I1 is stopped to be output after continuously outputting the test time t 1; the PC automatically records the value of the voltmeter at the moment, and according to the formula:
Accuracy= (rogowski coil transformation ratio x voltmeter value)/(test current value), calculating interference accuracy A1 of the product to be detected;
Step five: waiting for the interval time t2, and automatically repeating the step four by the current generator to obtain interference precision A2;
Step six: the PC machine compares the interference precision A1 and the interference precision A2 of the product to be tested with the qualified value A of the precision of the batch of products to be tested respectively;
step seven: if the interference precision A1 and the interference precision A2 are smaller than the qualified value A, the test results are displayed as qualified, the test is finished, and the product to be tested is replaced until the batch of products is tested;
If the interference precision A1 and the interference precision A2 are both larger than the qualified value A, the test result is stored, the product to be tested is replaced until the batch of products is tested;
The disturbance precision A1 is smaller than the qualified value A, the disturbance precision A2 is larger than the qualified value A, or the disturbance precision A1 is larger than the qualified value A, and the disturbance precision A2 is smaller than the qualified value A, the disturbance precision A1 is abnormal, and the fourth step, the fifth step and the sixth step are required to be repeated; if the measurement result is still abnormal, the measurement result is stored, and the product to be tested is replaced until the batch of products is tested.
As described above, the Rogowski coil testing device and the testing method thereof have the advantages of low cost, high testing accuracy and simple and quick operation, and can screen out products with poor anti-interference capability caused by poor manufacturing process, and improve the production control capability and the production efficiency of the products.
Drawings
FIG. 1 is a schematic diagram of a prior art test connection according to the present invention.
FIG. 2 is a schematic diagram of a test connection according to the present invention.
Description of element reference numerals
1. A rogowski coil; 2. a voltmeter; 3. a current generator; 4. a copper bar; 5. a PC; 101. and (5) an induction wire.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Referring to fig. 2, the present invention provides a method comprising: the device comprises a current generator 3, a copper bar 4, a voltmeter 2 and a PC 5;
The specification of the current generator 3 is 0-3000A, the copper bar 4 is of an inverted U-shaped structure, the current generator 3 outputs point-movement instant impact large current, the output current flows in from one end of the copper bar 4, the other end of the current flows out, a symmetrical interference power supply is output, and a closed magnetic field is formed in the copper bar 4; a positioning tool is arranged at the central position in the copper bar 4, and the Rogowski coil 1 to be tested is arranged on the positioning tool and is perpendicular to the magnetic field; the left side and the right side of the Rogowski coil 1 to be tested sense interference currents with the same size and opposite directions, and if the left side coil and the right side coil of the Rogowski coil 1 to be tested are wound uniformly and symmetrically, the induced voltage is zero; if the left Bian Xianjuan and right coils are wound unevenly and asymmetrically, the voltmeter 2 has induced voltage output, so that the rogowski coil 1 has error output.
The voltmeter 2 is a high-precision millivolt voltmeter with communication lines, the voltmeter 2 is connected with two induction lines 101 led out by the Rogowski coil 1 to be tested, and the two induction lines 101 are stranded. With this scheme, the interference signal is prevented from being transmitted, and the measurement error is caused.
The voltmeter 2 is also connected with the PC 5, the test result of the voltmeter 2 is transmitted to the PC 5, and the PC 5 automatically records and stores the test result and generates an Excel table. The tester can check the test result at any time as required and print the Excel table.
A testing method of a Rogowski coil testing device comprises the following steps:
step one: firstly inputting a serial number, a test date and a tester work number of a product to be tested on a PC;
Inputting a test current value I1, test time t1 and interval time t2;
Step two: setting test parameters on the current generator, wherein the test parameters comprise a test current value I1, test time t1 and interval time t2;
step three: placing a product to be tested into a positioning tool of a testing station;
step four: pressing a current output key of the current generator to output a test current value I1, wherein the test current value I1 is stopped to be output after continuously outputting the test time t 1; the PC automatically records the value of the voltmeter at the moment, and according to the formula:
Accuracy= (rogowski coil transformation ratio x voltmeter value)/(test current value), calculating interference accuracy A1 of the product to be detected;
Step five: waiting for the interval time t2, and automatically repeating the step four by the current generator to obtain interference precision A2;
Step six: the PC machine compares the interference precision A1 and the interference precision A2 of the product to be tested with the qualified value A of the precision of the batch of products to be tested respectively;
step seven: if the interference precision A1 and the interference precision A2 are smaller than the qualified value A, the test results are displayed as qualified, the test is finished, and the product to be tested is replaced until the batch of products is tested;
If the interference precision A1 and the interference precision A2 are both larger than the qualified value A, the test result is stored, the product to be tested is replaced until the batch of products is tested;
The disturbance precision A1 is smaller than the qualified value A, the disturbance precision A2 is larger than the qualified value A, or the disturbance precision A1 is larger than the qualified value A, and the disturbance precision A2 is smaller than the qualified value A, the disturbance precision A1 is abnormal, and the fourth step, the fifth step and the sixth step are required to be repeated; if the measurement result is still abnormal, the measurement result is stored, and the product to be tested is replaced until the batch of products is tested.
In a specific test, three Rogowski coils with a transformation ratio of 1000A/300mV are used as an example for illustration:
firstly inputting a serial number, a test date and a tester work number of a product to be tested on a PC; inputting a test current value I1, test time t1 and interval time t2;
setting the instantaneous output current of the current generator to be 1000A, wherein the test time is 2 seconds, and the interval time is 3 seconds;
Putting the sample 1 into a positioning tool;
Pressing a current output key of the current generator, wherein the display value of the voltmeter is 1mV, the PC automatically stores the display value to generate an Excel table, and corresponding interference precision A1= (1000×1/300)/(1000=0.33%;
after 3 seconds of interval, outputting the instantaneous current 1000A again, wherein the display value of the voltmeter is 1.1V, automatically storing the display value by the PC to generate an Excel table, and calculating the corresponding interference precision A2= (1000 multiplied by 1.1 multiplied by 300) multiplied by 1000 multiplied by 0.36%;
the interference precision fit value A of the Rogowski coil of the transformation ratio is +/-0.67%, the interference precision A1 and the interference precision A2 are smaller than the fit value A, the green light is turned on, the test result is stored, the test of the sample 1 is finished, and the sample 2 is replaced.
Putting the test article 2 into a test station;
Pressing a current output key of the current generator, wherein the display value of the voltmeter is 5V, the PC automatically stores the display value to generate an Excel table, and corresponding interference precision A1= (1000×5/300)/(1000=1.67%;
after 3 seconds of interval, outputting the instantaneous current 1000A again, wherein the display value of the voltmeter is 4.9mV, automatically storing the display value by the PC to generate an Excel table, and calculating the corresponding interference precision A2= (1000×4.9/300)/1000=1.63%;
The interference precision fit value of the Rogowski coil of the transformation ratio is +/-0.67%, the interference precision A1 and the interference precision A2 are both larger than the fit value A, the interference precision A1 and the interference precision A2 are displayed as unqualified, a red light is turned on, a buzzer alarms, the test result is stored, the test of the sample 2 is finished, and the sample 3 is replaced.
Placing the test article 3 into a test station;
pressing a current output key of the current generator, wherein the display value of the voltmeter is 1.9mV, the PC automatically stores the display value to generate an Excel table, and corresponding interference precision A1= (1000 multiplied by 1.9 multiplied by 300) multiplied by 1000 multiplied by 0.63% is calculated;
After 3 seconds of interval, outputting the instantaneous current 1000A again, wherein the display value of the voltmeter is 2.1mV, automatically storing the display value by the PC to generate an Excel table, and calculating the corresponding interference precision A2= (1000 multiplied by 2.1/300)/1000=0.7%;
The interference precision of the Rogowski coil of the transformation ratio is a plus or minus 0.67%, the interference precision A1 is less than the qualified value A, the interference precision A2 is more than the qualified value A, the interference precision A is abnormal, and the test is performed once again; if the two test results of the second time are still abnormal, the red light is on, the buzzer alarms, the measurement result is saved, the test of the sample 3 is finished, and the sample is replaced.
In the embodiment, the green light is on when the test result is qualified; when the test result is abnormal or not qualified, the red light is on, and meanwhile, the buzzer alarms, and a user can select a proper alarm mode according to the actual situation.
In summary, the rogowski coil testing device and the rogowski coil testing method have the advantages of low cost, high testing accuracy and simple and quick operation, and can screen out products with poor anti-interference capability caused by poor manufacturing process, and improve the production control capability and the production efficiency of the products. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (2)
1. A rogowski coil testing apparatus, comprising: the device comprises a current generator, a copper bar, a voltmeter and a PC;
the copper bar is of an inverted U-shaped structure, and a current output end of the current generator flows in from one end of the copper bar, and the other end of the current generator flows in from the other end of the copper bar
Flowing out, and forming a closed magnetic field in the copper bar;
the Rogowski coil to be measured is arranged on the central position in the copper bar and is perpendicular to the magnetic field;
the voltmeter is connected with the Rogowski coil to be tested; the voltmeter is also connected with the PC;
the specification of the current generator is 0-3000A;
A positioning tool is arranged at the center position in the copper bar, and a Rogowski coil to be tested is placed on the positioning tool;
the voltmeter is a high-precision millivolt voltmeter with a communication line;
the voltmeter is connected with two induction wires led out of the Rogowski coil to be tested, and the two induction wires are stranded.
2. A testing method of a Rogowski coil testing device is characterized by comprising the following steps: the method comprising the rogowski coil testing device according to claim 1, comprising the steps of:
step one: firstly inputting a serial number, a test date and a tester work number of a product to be tested on a PC;
Inputting a test current value I1, test time t1 and interval time t2;
Step two: setting test parameters on the current generator, wherein the test parameters comprise a test current value I1, test time t1 and interval time t2;
step three: placing a product to be tested into a positioning tool of a testing station;
Step four: pressing a current output key of the current generator to output a test current value I1, wherein the test current value I1 is stopped to be output after continuously outputting the test time t 1; the PC automatically records the value of the voltmeter at the moment, and according to the formula: accuracy= (rogowski coil transformation ratio x voltmeter value)/(test current value), calculating interference accuracy A1 of the product to be detected;
Step five: waiting for the interval time t2, and automatically repeating the step four by the current generator to obtain interference precision A2;
Step six: the PC machine compares the interference precision A1 and the interference precision A2 of the product to be tested with the qualified value A of the precision of the batch of products to be tested respectively;
step seven: if the interference precision A1 and the interference precision A2 are smaller than the qualified value A, the test results are displayed as qualified, the test is finished, and the product to be tested is replaced until the batch of products is tested;
If the interference precision A1 and the interference precision A2 are both larger than the qualified value A, the test result is stored, the product to be tested is replaced until the batch of products is tested;
The disturbance precision A1 is smaller than the qualified value A, the disturbance precision A2 is larger than the qualified value A, or the disturbance precision A1 is larger than the qualified value A, and the disturbance precision A2 is smaller than the qualified value A, the disturbance precision A1 is abnormal, and the fourth step, the fifth step and the sixth step are required to be repeated; if the measurement result is still abnormal, the measurement result is stored, and the product to be tested is replaced until the batch of products is tested.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911031795.1A CN111190071B (en) | 2019-10-28 | 2019-10-28 | Rogowski coil testing device and testing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911031795.1A CN111190071B (en) | 2019-10-28 | 2019-10-28 | Rogowski coil testing device and testing method thereof |
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| CN111190071A CN111190071A (en) | 2020-05-22 |
| CN111190071B true CN111190071B (en) | 2024-04-19 |
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