CN108169532B - Detachable high-precision quick-response noninductive shunt - Google Patents
Detachable high-precision quick-response noninductive shunt Download PDFInfo
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- CN108169532B CN108169532B CN201810211906.6A CN201810211906A CN108169532B CN 108169532 B CN108169532 B CN 108169532B CN 201810211906 A CN201810211906 A CN 201810211906A CN 108169532 B CN108169532 B CN 108169532B
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- 230000004044 response Effects 0.000 title claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 177
- 239000002184 metal Substances 0.000 claims abstract description 177
- 229910000838 Al alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 5
- 229910001369 Brass Inorganic materials 0.000 claims description 4
- 239000010951 brass Substances 0.000 claims description 4
- 238000010292 electrical insulation Methods 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 14
- 230000036632 reaction speed Effects 0.000 abstract description 3
- 230000002500 effect on skin Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention belongs to the field of current measurement, and relates to a detachable high-precision quick-response noninductive shunt. A detachable high-precision quick-response noninductive shunt comprises a metal conductive disc, a coaxial connector, a metal conduit, a tail end connector, an insulating base and an insulating sheath. The metal conducting disc A, the metal conducting disc B, the metal conducting disc C and the metal conducting disc D are sequentially fixed on the insulating base; the round hole of the metal conductive plate A is connected with the corresponding round hole of the metal conductive plate C through a metal conduit, and when the metal conduit passes through the metal conductive plate B, the metal conduit is insulated with the corresponding round hole of the metal conductive plate B through an insulating sheath; the metal conductive plates A are connected with a metal conduit at intervals of one round hole. The invention has the advantages of convenient disassembly and assembly, high reaction speed and high measurement precision, can be applied to measuring high-frequency and high-current, is easy to assemble and disassemble, flexible and variable in structure, adjustable in resistance value and greatly expands the measurement range compared with the traditional measurement device.
Description
Technical Field
The invention belongs to the field of current measurement, and relates to a detachable high-precision quick-response noninductive shunt.
Background
With the continuous development of electrical disciplines, more and more electrical technologies are being utilized in real production. The measurement technology of electrical parameters is becoming more and more important, especially in the field of high current measurement. The fault current of the breaker is short in current duration, large in peak value, quick in frequency change and the like. The deficiencies of conventional measuring devices, such as rogowski coils, coaxial shunts, current clamps, etc., in field measurements are increasingly apparent.
The coaxial shunt can react at nanosecond level, but has limited application due to heating and skin effect problems. Rogowski coil adopts non-contact measurement, and the measurement accuracy is affected by the direct current component of short-circuit current. The measuring range of the commercial current clamp is limited by the specification grade of the manufacturer, and the commercial current clamp is high in price and single in applicable object.
Under ideal conditions, the shunt can be regarded as a mΩ -level small resistor, but in actual measurement, due to stray inductance and capacitance, the capacitance capacitive reactance of the pF-level is very large, compared with the reactance value after the shunt resistance inductance branch, the capacitance branch can be ignored, and the voltage at two ends of the shunt is:
in addition, due to stray inductances, there is a mutual inductance between the shunt and the other current carrying loops, which, although these mutual inductance values may be in the μh order, in case of a large di (t)/dt, may cause voltages of tens or even hundreds of volts on the shunt. Therefore, the current divider is designed to minimize the inductance value of the current divider, and a shielding method is generally adopted to reduce the influence of the loaded loop on the current divider. The traditional coaxial shunt has the advantages that the external shielding sleeve can effectively reduce external interference, but obvious force effect and thermal effect can be generated, only small current can be measured, and the skin effect of the coaxial shunt is more obvious when the frequency is larger. The current of the disc type current divider flows radially from the center of the disc, so that the mutual inductance value is reduced, and the influence of an external loaded loop can be effectively reduced. The advantages of the two are combined, the structure of the current divider is improved, and the measuring range of the current divider can reach the kA level.
Disclosure of Invention
The detachable high-precision quick-response noninductive shunt provided by the invention adopts a fully symmetrical structure, has a noninductive design, has high reaction speed, and effectively solves the problems of skin effect and heat dissipation by adopting a hollow metal conduit.
The technical scheme of the invention is as follows:
a detachable high-precision quick-response noninductive shunt comprises a metal conductive disc A, a metal conductive disc B, a metal conductive disc C, a metal conductive disc D, a coaxial connector 1, a metal conduit 3, a tail end connector 4, an insulating base 5 and an insulating sheath 7.
A round hole is formed in the center of the metal conductive disc A; round holes are arranged at positions with the radius of R1 and R2 by taking the center of the metal conductive disc A as an origin, wherein R2 is more than R1, the space between the round holes is the same, and the number of the round holes in each circle is even; the metal conducting disc B, the metal conducting disc C, the metal conducting disc D and the metal conducting disc A have the same shape and can be mutually interchanged.
The metal conducting disc A and the metal conducting disc B are connected by adopting the coaxial connector 1, the metal conducting disc A is connected with the outer layer of the coaxial connector 1, and the metal conducting disc B is connected with the inner layer of the coaxial connector 1, so that the electrical insulation of the metal conducting disc A and the metal conducting disc B is realized.
The metal conductive disc C and the metal conductive disc D are electrically connected through the central round holes of the metal conductive disc C and the metal conductive disc D by the tail end connector 4; the metal conducting disc A, the metal conducting disc B, the metal conducting disc C and the metal conducting disc D are sequentially fixed on the insulating base 5.
The round hole of the metal conductive disk A is connected with the corresponding round hole of the metal conductive disk C through a metal guide pipe 3, and when the metal guide pipe 3 passes through the metal conductive disk B, the metal guide pipe is insulated with the corresponding round hole of the metal conductive disk B through an insulating sheath 7; the metal conductive plates A are connected with a metal conduit 3 every other round hole.
The residual round holes of the metal conductive plate B are connected with the corresponding round holes of the metal conductive plate D through the metal guide pipes 3, and when the metal guide pipes 3 pass through the metal conductive plate C, the metal guide pipes are insulated with the corresponding round holes of the metal conductive plate C through the insulating sheath 7.
The metal conduit 3 is of a hollow structure, so that uniform current distribution is realized, and the skin effect is reduced; the hollow structure increases the relative heat dissipation area of the conductor; the two ends of the metal guide pipe 3 adopt reverse thread structures, and when the two ends of the metal guide pipe are connected with the metal conducting disc through threads, the metal conducting disc connected with the metal guide pipe can be installed or detached simultaneously.
The coaxial connector 1 is of a three-layer structure, an outer layer and an inner core are made of conductive materials, and an intermediate layer is made of insulating materials; the tail connector 4 is made of an electrically conductive material.
The current flows through the center of the metal conductive disk A through the outer layer of the coaxial connector 1, then flows into the metal conduit 3 connected with the metal conductive disk A from the center in the radial direction, and flows into the center of the metal conductive disk C from the metal conduit 3 in the radial direction; current flows through the tail connector 4 from the metal conductive pad C to the metal conductive pad D; the current flows radially from the center of the metal conductive disk D to the edge of the metal conductive disk D, flows to the metal conductive disk B through the metal conduit 3, and is radially reserved from the edge of the metal conductive disk B to the center of the metal conductive disk B; the current flows out through the inner layer of the coaxial connector 1.
The shunt is designed with the following factors in mind: resistance R of metal conduit 3 0 Square wave response time T, resistance R of metal conduit 3 0 The calculation can be made by the following formula:
wherein ρ is the resistivity of the material, l is the length of the small-resistance cylinder, a is the inner diameter of the small-resistance cylinder, and h is the thickness of the cylinder;
square wave response time T:
T＝μh 2 /6ρ (3)
where μ is the permeability of the small resistance material, approximating vacuum permeability, μ=μ 0 ＝4π×10 -7 H.m -1 。
Further, the metal conducting disc A, the metal conducting disc B, the metal conducting disc C and the metal conducting disc D are made of aluminum alloy materials.
Further, the metal conduit 3 is made of aluminum alloy or brass.
The invention has the beneficial effects that: the invention has the advantages of convenient disassembly and assembly, high reaction speed and high measurement precision, can be applied to measuring high-frequency and high-current, is easy to assemble and disassemble, flexible and variable in structure, adjustable in resistance value and greatly expands the measurement range compared with the traditional measurement device.
Drawings
FIG. 1 is a diagram of a removable sensorless shunt installation and arrangement.
Fig. 2 is a schematic view of a metal conductive pad.
Fig. 3 is a schematic view of a multi-row mounting hole conductive metal pad.
Fig. 4 is a schematic view of a metal conduit.
In the figure, 1 a coaxial connector; 2, a metal conductive plate; 3 a metal conduit; 4 a tail end connector; 5, insulating a base; 6, locking the nut; and 7, insulating sheath.
Detailed Description
The implementation process of the invention is specifically described below with reference to the technical scheme and the attached drawings.
As shown in fig. 1 to 4, the metal conductive plate a, the metal conductive plate B, the metal conductive plate C and the metal conductive plate D are all made of aluminum alloy materials, and have a diameter of 25cm and a thickness of 4cm. The center of the metal conducting disc is provided with an opening with the diameter of 4cm. 3 threaded holes are uniformly formed at the position 8cm away from the center, and the diameter is 1.2cm; 3 through holes are uniformly formed at the position 8cm away from the center, the diameter is 1.3cm, and the included angle between adjacent threaded holes and the through holes is 60 degrees. And a group of holes, 6 threaded holes, 6 through holes and 1.2cm in diameter are further processed 10cm away from the center, and the included angle between the adjacent threaded holes and the through holes is 30 degrees. When the first threaded hole is formed in the two groups of holes during processing, the centers of the two threaded holes and the center of the metal conductive disc are in the same straight line.
The metal conduit 3 is made of two materials, namely aluminum alloy and brass, the length of the metal conduit 3 is 50cm, the outer diameter is 1.2cm, the thickness of the conduit wall is 1cm, the two ends are provided with reverse threads, and the length of the threads is 0.7cm.
The metal conduit 3 and the metal conductive plate are connected in a threaded manner. The metal conductive plate A and the metal conductive plate C are a group, and the metal conductive plate B and the metal conductive plate D are a group. The metal conduit 3 connecting the metal conductive plate a and the metal conductive plate C is insulated by an insulating sheath 7 when passing through the metal conductive plate B. The same method is adopted when the metal conduit 3 connecting the metal conductive pad B and the metal conductive pad D passes through the metal conductive pad C.
The metal conductive plate A and the metal conductive plate B are connected by adopting a coaxial connector 1, but the metal conductive plate A and the metal conductive plate B are insulated on a circuit; the metal conductive plate C and the metal conductive plate D are connected by adopting a tail connector 4.
Claims (8)
1. The detachable high-precision quick response noninductive shunt is characterized by comprising a metal conductive disc A, a metal conductive disc B, a metal conductive disc C, a metal conductive disc D, a coaxial connector (1), a metal guide tube (3), a tail end connector (4), an insulating base (5) and an insulating sheath (7);
a round hole is formed in the center of the metal conductive disc A; round holes are arranged at positions with the radius of R1 and R2 by taking the center of the metal conductive disc A as an origin, wherein R2 is more than R1, the space between the round holes is the same, and the number of the round holes in each circle is even; the metal conductive plate B, the metal conductive plate C, the metal conductive plate D and the metal conductive plate A have the same shape and can be mutually interchanged;
the metal conducting disc A and the metal conducting disc B are connected by adopting a coaxial connector (1), the metal conducting disc A is connected with the outer layer of the coaxial connector (1), and the metal conducting disc B is connected with the inner layer of the coaxial connector (1) so as to realize the electrical insulation of the metal conducting disc A and the metal conducting disc B; the metal conducting disc C and the metal conducting disc D are electrically connected through the central round holes of the metal conducting disc C and the metal conducting disc D by a tail end connector (4); the metal conducting disc A, the metal conducting disc B, the metal conducting disc C and the metal conducting disc D are sequentially fixed on the insulating base (5);
the round hole of the metal conductive disk A is connected with the corresponding round hole of the metal conductive disk C through a metal guide pipe (3), and when the metal guide pipe (3) passes through the metal conductive disk B, the metal guide pipe is insulated with the corresponding round hole of the metal conductive disk B through an insulating sheath (7); the metal conducting disc A is connected with a metal conduit (3) at intervals of one round hole; the residual round holes of the metal conductive plate B are connected with the corresponding round holes of the metal conductive plate D through metal guide pipes (3), and when the metal guide pipes (3) penetrate through the metal conductive plate C, the metal guide pipes are insulated with the corresponding round holes of the metal conductive plate C through insulating jackets (7);
the coaxial connector (1) is of a three-layer structure, the outer layer and the inner core are made of conductive materials, and the middle layer is made of insulating materials; the tail connector (4) is made of conductive material.
2. The detachable high-precision quick response noninductive shunt according to claim 1, wherein the metal conduit (3) is of a hollow structure.
3. The detachable high-precision quick response noninductive shunt according to claim 1 or 2, wherein two ends of the metal guide pipe (3) adopt reverse thread structures, and when two ends of the metal guide pipe are connected with the metal conductive disc through threads, the metal conductive disc connected with the metal guide pipe can be installed or detached simultaneously.
4. A detachable high-precision fast-response noninductive shunt according to claim 1 or 2, characterized in that the metal conduit (3) is made of aluminum alloy or brass.
5. A detachable high-precision fast-response noninductive shunt according to claim 3, characterized in that the metal guide tube (3) is made of aluminum alloy or brass.
6. The detachable high-precision quick response noninductive shunt according to claim 1, 2 or 5, wherein the metal conducting disc A, the metal conducting disc B, the metal conducting disc C and the metal conducting disc D are made of aluminum alloy materials.
7. The detachable high-precision quick response noninductive shunt according to claim 3, wherein the metal conducting disc A, the metal conducting disc B, the metal conducting disc C and the metal conducting disc D are made of aluminum alloy materials.
8. The detachable high-precision quick response noninductive shunt according to claim 4, wherein the metal conducting disc A, the metal conducting disc B, the metal conducting disc C and the metal conducting disc D are made of aluminum alloy materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810211906.6A CN108169532B (en) | 2018-03-06 | 2018-03-06 | Detachable high-precision quick-response noninductive shunt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810211906.6A CN108169532B (en) | 2018-03-06 | 2018-03-06 | Detachable high-precision quick-response noninductive shunt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108169532A CN108169532A (en) | 2018-06-15 |
| CN108169532B true CN108169532B (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810211906.6A Active CN108169532B (en) | 2018-03-06 | 2018-03-06 | Detachable high-precision quick-response noninductive shunt |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044767A (en) * | 2019-12-05 | 2020-04-21 | 北京东方计量测试研究所 | Pulse current divider |
| CN115184792B (en) * | 2022-08-01 | 2024-05-17 | 北京航空航天大学 | Quick response noninductive shunt with adjustable measuring range |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412167A (en) * | 2013-08-05 | 2013-11-27 | 北京无线电计量测试研究所 | Coaxial disk type splitter for measuring recurrent pulse current |
| CN203479880U (en) * | 2013-09-27 | 2014-03-12 | 北京无线电计量测试研究所 | Open type impedance matching connector used for pulse high current measurement |
| CN106526272A (en) * | 2016-09-24 | 2017-03-22 | 北京东方计量测试研究所 | Novel precision shunt |
| CN207946463U (en) * | 2018-03-06 | 2018-10-09 | 大连理工大学 | A kind of removable noninductive current divider of high-precision fast-response |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6608419B2 (en) * | 2000-12-27 | 2003-08-19 | General Electric Company | Flux shunt for a power generator stator assembly |
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2018
- 2018-03-06 CN CN201810211906.6A patent/CN108169532B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412167A (en) * | 2013-08-05 | 2013-11-27 | 北京无线电计量测试研究所 | Coaxial disk type splitter for measuring recurrent pulse current |
| CN203479880U (en) * | 2013-09-27 | 2014-03-12 | 北京无线电计量测试研究所 | Open type impedance matching connector used for pulse high current measurement |
| CN106526272A (en) * | 2016-09-24 | 2017-03-22 | 北京东方计量测试研究所 | Novel precision shunt |
| CN207946463U (en) * | 2018-03-06 | 2018-10-09 | 大连理工大学 | A kind of removable noninductive current divider of high-precision fast-response |
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| CN108169532A (en) | 2018-06-15 |
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