CN212379455U - Power frequency magnetic field generator for checking transformer core grounding current tester - Google Patents
Power frequency magnetic field generator for checking transformer core grounding current tester Download PDFInfo
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- CN212379455U CN212379455U CN202020405661.3U CN202020405661U CN212379455U CN 212379455 U CN212379455 U CN 212379455U CN 202020405661 U CN202020405661 U CN 202020405661U CN 212379455 U CN212379455 U CN 212379455U
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- 230000006698 induction Effects 0.000 claims abstract description 25
- 210000000078 claw Anatomy 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000009434 installation Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 abstract description 3
- 230000007115 recruitment Effects 0.000 abstract 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 6
- 230000036039 immunity Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The utility model relates to a transformer core earth current tester is with recruitment frequency magnetic field generator, its characterized in that: the induction coil is arranged in the rectangular square frame; the testing support is installed at the middle position inside the rectangular square frame and comprises a three-leg frame body and clamping claws, three supporting legs of the three-leg frame body are respectively limited at the middle position of the top wall of the rectangular square frame and two included angles at the lower part of the rectangular square frame, mounting holes are uniformly formed in the three supporting legs in a scale and interval mode, the clamping claws are installed on the supporting legs through matching of mounting screws at the lower parts of the clamping claws and the mounting holes, and the three clamping areas formed between the clamping claws are clamping areas of the current clamp. The utility model discloses structural design scientific and reasonable has magnetic induction intensity and satisfies the requirement, the check-up precision is high, convenient operation, the advantage of easily realizing.
Description
Technical Field
The utility model belongs to electric power testing arrangement field relates to a power frequency magnetic field generator, especially a transformer core ground current tester check-up power frequency magnetic field generator.
Background
According to the requirements of the working scheme for testing comparison capability evaluation of electrified detection equipment of national grid company, the calibration of a transformer core grounding current tester needs to be subjected to a basic error test under an interference condition. The interference condition is a power frequency magnetic field perpendicular to the current clamp, the magnetic induction intensity needs to be 5mT, and the magnetic field needs to be kept uniform and stable in the area where the current clamp is located.
However, at present, the existing power frequency magnetic field generator cannot meet the requirement of the calibration of a transformer core grounding current tester, and specifically comprises:
1. the existing power frequency magnetic field generator for the electromagnetic compatibility immunity test usually outputs the maximum magnetic induction intensity which is not more than 1.3 mT. The highest-level test specified in the national standard GB/T17626.8 electromagnetic compatibility test and measurement technology power frequency magnetic field immunity test is 1000A/m and is approximately equal to 1.256mT, so that the magnetic induction intensity of the conventional power frequency magnetic field generator cannot meet the requirement of the calibration of a transformer core grounding current tester;
2. current current pincers are when the test, need place on the supporting T type rack of power frequency magnetic field generator, the vertical part of this T type rack is fixed subaerial, the horizontal part is used for bearing current pincers, because the size of each current pincers that will test differs, the height of T type rack can not be adjusted again, lead to the center that can' T guarantee current pincers unanimous with the center of coil (according to the output characteristic of square power frequency magnetic field generator coil, the magnetic induction intensity of coil central point position is the biggest, therefore, be 5mT for guaranteeing the current pincers environmental magnetic field of transformer core ground current tester by the check-up, must fix the center at power frequency magnetic field generator with the position of current pincers, and the direction is parallel with magnetic field generator coil), thereby the precision that leads to the check-up is lower.
Therefore, a new industrial frequency magnetic field generator has to be developed.
Disclosure of Invention
An object of the utility model is to provide a structural design scientific and reasonable, magnetic induction strength satisfies requirement, check-up precision is high, convenient operation, the transformer core grounding current tester that easily realizes uses magnetic field generator frequently for the check-up.
The utility model provides a its technical problem realize through following technical scheme:
the utility model provides a transformer core grounding current tester for check-up worker frequency magnetic field generator, includes experimental generator, induction coil and ground plate, and experimental generator passes through the wire and is connected with induction coil, and induction coil erects its characterized in that through the ground plate: the induction coil is arranged in the rectangular square frame; the testing support is installed at the middle position inside the rectangular square frame and comprises a three-leg frame body and clamping claws, three supporting legs of the three-leg frame body are respectively limited at the middle position of the top wall of the rectangular square frame and two included angles at the lower part of the rectangular square frame, mounting holes are uniformly formed in the three supporting legs in a scale and interval mode, the clamping claws are installed on the supporting legs through matching of mounting screws at the lower parts of the clamping claws and the mounting holes, and the three clamping areas formed between the clamping claws are clamping areas of the current clamp.
Moreover, the side length of the outer frame of the rectangular box is 49-100 cm.
The clamping claw is composed of a positioning block, an installation screw rod and a nut, the installation screw rod is arranged at the bottom of the positioning block, and the nut is installed on the installation screw rod in a threaded mode.
And the positioning block is of an isosceles triangle structure, the long edge of the isosceles triangle is used for limiting the current clamp, and the vertex angle of the isosceles triangle is used for indicating the scale.
The utility model discloses an advantage and beneficial effect do:
1. the power frequency magnetic field generator for the calibration of the transformer core grounding current tester can adjust the position of the clamping claws on the test bracket according to the size of a current clamp to be tested when in use, and as the test part of the test current clamp is circular, the centrality of the current clamp in a coil can be ensured as long as the positions of the clamping claws on the supporting legs are ensured to be consistent, thereby ensuring the problems of the electromagnetic intensity and the test precision of the current clamp; and the factors influencing the output magnetic field intensity of the power frequency magnetic field generator comprise the amplitude of output current, the side length of the coil and the number of turns of the coil. In short, magnetic induction is proportional to the current amplitude, inversely proportional to the coil side length, and proportional to the number of coil turns. Therefore, in order to enable the power frequency magnetic field generator to generate a magnetic field of 5mT, the proper output current, the side length of the coil and the number of turns of the coil are selected, and the side length of the coil is reduced on the premise that the output current and the number of turns of the coil are not increased remarkably, namely the existing larger side length is designed to be the existing smaller side length of 49-100cm, so that the power frequency magnetic field of 5mT is output.
2. The power frequency magnetic field generator for the calibration of the transformer core grounding current tester facilitates the limiting of a current clamp and the finding of the center by designing the clamping claw into a triangular structure.
3. The utility model has the advantages of scientific and reasonable structural design, have magnetic induction intensity satisfy the requirement, the check-up precision is high, convenient operation, easily realization, be a transformer core earth current tester for check-up frequent magnetic field generator with higher novelty.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is a schematic structural view of the clamping claw of the present invention.
Description of reference numerals:
1-a test generator, 2-a rectangular square frame, 3-a test bracket, 4-a grounding plate, 5-a supporting leg, 6-scales, 7-a mounting hole, 8-a clamping claw, 9-a positioning block, 10-a mounting screw and 11-a nut.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
The utility model provides a transformer core grounding current tester is check-up with worker frequency magnetic field generator, includes experimental generator 1, induction coil and ground plate 4, and experimental generator passes through the wire and is connected with induction coil, and induction coil erects through the ground plate, and its innovation part lies in: the induction coil is arranged in the rectangular square frame 2; the testing device is characterized by further comprising a testing support 3, wherein the testing support is installed in the middle of the inside of the rectangular square frame and comprises a three-leg frame body and clamping claws 8, three supporting legs 5 of the three-leg frame body are limited in the middle of the top wall of the rectangular square frame and two included angles at the lower portion of the rectangular square frame respectively, scales 6 are arranged on the three supporting legs, mounting holes 7 are evenly distributed at intervals, the clamping claws are installed on the supporting legs through matching of mounting screws 10 at the lower portions of the clamping claws and the mounting holes, and an area formed among the three clamping claws is a clamping area of the current clamp. The central intersection point of the three support legs is the geometric center of the coil.
The side length of the outer frame of the rectangular box is 49-100 cm.
The clamping claw is composed of a positioning block 9, an installation screw rod and a nut 11, the installation screw rod is arranged at the bottom of the positioning block, and the nut is installed on the installation screw rod in a threaded mode.
The positioning block is of an isosceles triangle structure, the long edge of the isosceles triangle is used for limiting the current clamp, and the vertex angle of the isosceles triangle is used for indicating the scale.
Factors influencing the output magnetic field intensity of the power frequency magnetic field generator comprise the amplitude of output current, the side length of a coil and the number of turns of the coil. In short, magnetic induction is proportional to the current amplitude, inversely proportional to the coil side length, and proportional to the number of coil turns. Therefore, in order to enable the power frequency magnetic field generator to generate a 5mT magnetic field, the proper output current, the side length of the coil and the number of turns of the coil are selected, and the side length of the coil is reduced on the premise of not increasing the output current and the number of turns of the coil remarkably, so that the 5mT power frequency magnetic field is output. Meanwhile, by combining the characteristics of a magnetic field generated by a square coil, a current clamp of the tested transformer core grounding current tester is ensured to be positioned at the geometric center of the magnetic field coil, and the direction of the current clamp is parallel to the direction of the magnetic field generator coil. Therefore, the utility model discloses at coil internally mounted have had the test support of scale to overcome above problem.
According to the magnetic induction formula, the magnetic induction of the center position of the square coil
Where n is the number of turns of the coil, mu0The coil is air permeability, I is power frequency current amplitude, and R is square coil side length.
With the known condition that B is 5X 10-3T，μ0＝4π×10-7At present, the output current is set to be 20A, the number of turns of the coil is set to be 110, the side length of the square coil is set to be 0.49m, and the magnetic induction intensity of an electromagnetic field output by the coil is 5.09mT through calculation, so that the requirement of checking an iron core grounding current tester is met.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims, and therefore, the scope of the present invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (4)
1. The utility model provides a transformer core grounding current tester for check-up worker frequency magnetic field generator, includes experimental generator, induction coil and ground plate, and experimental generator passes through the wire and is connected with induction coil, and induction coil erects its characterized in that through the ground plate: the induction coil is arranged in the rectangular square frame; the testing support is installed at the middle position inside the rectangular square frame and comprises a three-leg frame body and clamping claws, three supporting legs of the three-leg frame body are respectively limited at the middle position of the top wall of the rectangular square frame and two included angles at the lower part of the rectangular square frame, mounting holes are uniformly formed in the three supporting legs in a scale and interval mode, the clamping claws are installed on the supporting legs through matching of mounting screws at the lower parts of the clamping claws and the mounting holes, and the three clamping areas formed between the clamping claws are clamping areas of the current clamp.
2. The power frequency magnetic field generator for verifying the transformer core grounding current tester as claimed in claim 1, wherein: the side length of the outer frame of the rectangular box is 49-100 cm.
3. The power frequency magnetic field generator for verifying the transformer core grounding current tester as claimed in claim 1, wherein: the clamping claw is composed of a positioning block, an installation screw rod and a nut, the installation screw rod is arranged at the bottom of the positioning block, and the nut is installed on the installation screw rod in a threaded mode.
4. The power frequency magnetic field generator for verifying the transformer core grounding current tester as claimed in claim 3, wherein: the positioning block is of an isosceles triangle structure, the long edge of the isosceles triangle is used for limiting the current clamp, and the vertex angle of the isosceles triangle is used for indicating the scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020405661.3U CN212379455U (en) | 2020-03-26 | 2020-03-26 | Power frequency magnetic field generator for checking transformer core grounding current tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020405661.3U CN212379455U (en) | 2020-03-26 | 2020-03-26 | Power frequency magnetic field generator for checking transformer core grounding current tester |
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| CN212379455U true CN212379455U (en) | 2021-01-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904127A (en) * | 2021-01-26 | 2021-06-04 | 浙江亚太机电股份有限公司 | Low-frequency magnetic field interference generating device |
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2020
- 2020-03-26 CN CN202020405661.3U patent/CN212379455U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904127A (en) * | 2021-01-26 | 2021-06-04 | 浙江亚太机电股份有限公司 | Low-frequency magnetic field interference generating device |
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