CN110836986A - Manganese-copper current divider for electronic electric energy meter and application thereof - Google Patents
Manganese-copper current divider for electronic electric energy meter and application thereof Download PDFInfo
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Abstract
The manganese-copper shunt comprises a first conducting strip, a second conducting strip and a manganese-copper sheet, wherein the first conducting strip, the manganese-copper sheet and the second conducting strip are sequentially connected and are positioned on the same plane; the middle part of the manganese copper sheet is provided with a through hole, and the upper end and the lower end of the manganese copper sheet are respectively provided with a first connecting end and a second connecting end; the first connecting end is fixedly connected with the first signal wire, the second connecting end is fixedly connected with the second signal wire, the second signal wire penetrates through the through hole and is wound together with the first signal wire, and the tail ends of the first signal wire and the second signal wire are respectively connected with the circuit board. The manganin shunt for the electronic electric energy meter and the application thereof have simple structure, can reduce the interference of alternating magnetic field on the manganin shunt as a current sampling element, and reduce the influence of the magnetic field on a current sampling signal, thereby effectively ensuring the metering accuracy of the electronic electric energy meter and having wide application.
Description
Technical Field
The invention belongs to the technical field of current dividers, and particularly relates to a manganese-copper current divider for an electronic electric energy meter and application thereof.
Background
The electronic electric energy meter is a physical instrument which samples the voltage and current supplied by a user in real time, processes and multiplies the sampled voltage and current signals by a special electric energy meter integrated circuit to convert the sampled voltage and current signals into pulses which are in direct proportion to electric energy to be output, and displays the pulses by a meter or a digital display.
The current sampling unit of the electronic electric energy meter comprises a current transformer sampling mode and a manganin shunt sampling mode, the measurement of the current of a live wire is usually realized by adopting a manganin shunt element, and the measurement of the current of a neutral wire adopts a current transformer element.
The manganin shunt is widely applied to current measurement due to the advantages of small temperature coefficient and low cost. As a key component of a current sampling circuit of the single-phase electric energy meter, the accuracy of the current sampling of the manganin shunt can directly influence the metering precision of the electric energy meter. The electromagnetic knowledge and the transformer characteristics can know that the power frequency magnetic field hardly influences the current transformer and can cause great influence on the manganin shunt.
When a manganin shunt in a current sampling part of a traditional electronic electric energy meter is subjected to electromagnetic interference, metering errors can be generated, and influences are caused to users and power grid companies. In order to overcome the defects of the traditional electronic electric energy meter magnetic field interference resisting technology, the structure of the traditional manganin shunt needs to be improved, so that the manganin shunt can resist the magnetic field interference from an uncertain direction, and the metering accuracy of the electronic electric energy meter is ensured.
Chinese patent application No. CN201721612107.7 discloses a manganese-copper shunt of anti power frequency magnetic field, the inboard of manganese-copper shunt body is provided with the manganese-copper body, and the inboard both ends of manganese-copper body all are provided with the connection pin, are connected with the sample lead wire on the connection pin, and the inboard of sample lead wire is provided with antimagnetic layer, and one side of sample lead wire is provided with connecting wire, and antimagnetic cover has been cup jointed in the outside of manganese-copper shunt body. The device resists a power frequency magnetic field through the antimagnetic sleeve and the antimagnetic layer, the effect of the antimagnetic field is weak, and the service lives of the antimagnetic sleeve and the antimagnetic layer are short.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the manganin shunt for the electronic electric energy meter and the application thereof, the manganin shunt is simple in structure, the interference of an alternating magnetic field on the manganin shunt serving as a current sampling element can be reduced, and the influence of the magnetic field on a current sampling signal is reduced, so that the metering accuracy of the electronic electric energy meter is effectively ensured, and the application is wide.
The purpose of the invention is realized by the following technical scheme:
the manganese-copper shunt for the electronic electric energy meter is characterized by comprising a first conducting strip, a second conducting strip and a manganese-copper sheet, wherein the first conducting strip, the manganese-copper sheet and the second conducting strip are sequentially connected and positioned on the same plane; the middle part of the manganese copper sheet is provided with a through hole, and the upper end and the lower end of the manganese copper sheet are respectively provided with a first connecting end and a second connecting end; the first connecting end is fixedly connected with the first signal wire, the second connecting end is fixedly connected with the second signal wire, the second signal wire penetrates through the through hole and is wound together with the first signal wire, and the tail ends of the first signal wire and the second signal wire are respectively connected with the circuit board.
In order to eliminate the influence of induced current on the metering of the electric energy meter, the manganin current divider for the electronic electric energy meter is characterized in that a loop is divided into two loops with different directions, induced electromotive forces with different directions are generated, induced currents with different directions are formed and are counteracted with each other, and the influence caused by the induced currents is reduced as much as possible. The method comprises the following specific steps: the manganese copper sheet is used as a sampling resistance sheet, two ends of the manganese copper sheet are respectively connected with the first conducting sheet and the second conducting sheet, the first connecting end and the second connecting end are respectively arranged at two ends of the manganese copper sheet, a through hole is arranged in the manganese copper sheet, a signal wire connected to the lower side edge penetrates through the through hole of the manganese copper sheet, and the signal wire connected to the upper side edge is hinged with the signal wire on the upper side edge of the manganese copper sheet.
Furthermore, in the manganin shunt for the electronic electric energy meter, the first conducting strip and the second conducting strip are beryllium copper.
The conducting strip in the prior art is mostly a common copper sheet, and electric conductivity is poor, and easy friction produces the spark, and easy rust candle, yielding, and can't recover after just warping. Beryllium copper is a copper alloy taking beryllium as a main alloy element, is also a supersaturated solid solution copper-based alloy, and has the characteristics of high elasticity, high strength, high conductivity and corrosion resistance.
Further, the first conductive plate of the manganin shunt for the electronic electric energy meter further comprises a shunt plate, a regulator and a fixing plate, wherein the shunt plate is arranged on one side of the first conductive plate, and the fixing plate is arranged below the other side of the first conductive plate; the regulator comprises an adjusting hole and an adjusting screw, the fixing plate is L-shaped, the adjusting hole is formed in one surface of the fixing plate parallel to the first conducting strip, and the adjusting screw penetrates through the adjusting hole to be perpendicular to the first conducting strip; the structure of the second conducting strip is the same as that of the first conducting strip.
The existing conducting strip can not restore the original state once being deformed, so that the conducting strip loses the reliable electrical connection function. According to the first conducting strip and the second conducting strip, the regulator is adopted, if the conducting strips deform, the regulator can restore the functions of the conducting strips, high-amplitude lightning current can pass through the flow distribution plate, flashover and ignition are avoided, the first conducting strip and the second conducting strip have good elasticity, no rusty candle is produced in the using process, and the first conducting strip and the second conducting strip are fixed to ensure that no spalling phenomenon occurs.
Further, the manganese-copper shunt for the electronic electric energy meter comprises the following components in parts by mass: 85 parts of manganese-copper alloy, 10 parts of zinc oxide, 1 part of lead, 0.5 part of boron, 0.4 part of iron, 0.1 part of beryllium and 0.1 part of bismuth.
Furthermore, the resistivity of the manganese copper sheet of the manganese copper shunt for the electronic electric energy meter is 4.5 multiplied by 10-7πm。
Further, the signal wire of the manganin shunt for the electronic electric energy meter comprises a copper core conductor, polyethylene insulation, steel wire weaving and a flame-retardant polyvinyl chloride sheath; the copper core conductor, the polyethylene insulation, the steel wire weaving and the flame-retardant polyvinyl chloride sheath are sequentially coated from inside to outside; the structure of the second signal line is the same as that of the first signal line.
Further, in the manganese-copper shunt for the electronic electric energy meter, gaps among the copper core conductor, the polyethylene insulation, the steel wire weaving and the flame-retardant polyvinyl chloride sheath are filled with petroleum jelly.
Furthermore, the resistivity of the signal wire I and the signal wire II is 1.8 multiplied by 10 < -8 > pi < m > in the manganin shunt for the electronic electric energy meter.
Furthermore, in the manganin shunt for the electronic electric energy meter, the diameter of the through hole is 4.0mm, the distance between the through hole and the first connecting end is 5.5mm, and the distance between the through hole and the second connecting end is 6.0 mm.
The size of the through hole, the distance between the through hole and the first connecting end and the distance between the through hole and the second connecting end have large influence on the induced current, wherein for the induced current under the X-direction power frequency magnetic field interference, the distance between the through hole and the first connecting end is a main influence factor, and for the induced current under the Z-direction power frequency magnetic field interference, the distance between the through hole and the second connecting end is a main influence factor.
Furthermore, the application of the manganin shunt for the electronic electric energy meter is a current sampling device of the electronic electric energy meter.
The electronic electric energy meter can be an electronic single-phase electric energy meter, an electronic three-phase active electric energy meter, an electronic active and passive bidirectional multifunctional electric energy meter and an IC card electric energy meter.
Compared with the prior art, the invention has the following beneficial effects:
(1) the manganin shunt for the electronic electric energy meter is simple in structure, the first conducting strip and the second conducting strip are respectively arranged at the two ends of the manganin strip, the manganin strip is provided with the through hole, the signal wire connected to the lower side edge penetrates out of the through hole of the manganin strip, and the signal wire connected to the upper side edge is hinged with the signal wire on the upper side edge of the manganin strip to form two loops with opposite directions, and induced currents formed on the two sides are opposite under the action of an alternating magnetic field and can be mutually offset, so that the interference of the shunt serving as a current sampling element on the alternating magnetic field is reduced, the influence of the magnetic field on a current sampling signal is reduced, and the metering accuracy of the electronic electric energy meter is effectively ensured;
(2) according to the manganese-copper shunt for the electronic electric energy meter, the first conducting strip and the second conducting strip are made of beryllium copper, so that the problems that in the prior art, a copper sheet conducting strip is poor in conductivity, easy to rub to generate sparks, easy to rust and deform and incapable of being recovered after deformation are solved; (3) according to the first conducting strip and the second conducting strip, if the conducting strips deform through the regulator, the functions of the first conducting strip and the second conducting strip can be restored through the regulator, high-amplitude lightning current can pass through the splitter plate, flashover and ignition are avoided, the first conducting strip and the second conducting strip are good in elasticity, no rusty candle is produced in the using process, and the first conducting strip and the second conducting strip are fixed to ensure that no spalling phenomenon occurs;
(3) the invention improves the size of the through hole, the distance between the through hole and the first connecting end and the distance between the through hole and the second connecting end, and reduces the influence of a magnetic field on a current sampling signal to the maximum extent;
(4) the invention is widely applied to various electronic electric energy meters such as an electronic single-phase electric energy meter, an electronic three-phase active electric energy meter, an electronic active and passive bidirectional multifunctional electric energy meter and the like.
Drawings
FIG. 1 is a schematic structural diagram of a manganin shunt for an electronic electric energy meter according to the invention;
fig. 2 is a schematic structural diagram of a first conductive sheet of the manganin shunt for an electronic electric energy meter according to the invention;
FIG. 3 is a schematic structural diagram of a signal line of the manganin shunt for the electronic electric energy meter according to the invention;
in the figure: the device comprises a first conducting strip 1, a shunt plate 11, a regulator 12, a regulating hole 121, a regulating screw 122, a fixing plate 13, a second conducting strip 2, a manganin strip 3, a through hole 31, a first connecting end 32, a second connecting end 33, a first signal wire 34, a copper core conductor 341, a polyethylene insulation 342, a steel wire weaving 343, a flame-retardant polyvinyl chloride sheath 344, a second signal wire 35 and a circuit board 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific experimental data and accompanying drawings 1 to 3, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the following embodiments provide an electronic manganin shunt for an electric energy meter, including a first conductive sheet 1, a second conductive sheet 2, and a manganin sheet 3, where the first conductive sheet 1, the manganin sheet 3, and the second conductive sheet 2 are connected in sequence and located on the same plane; the middle part of the manganese copper sheet 3 is provided with a through hole 31, and the upper end and the lower end of the manganese copper sheet 3 are respectively provided with a first connecting end 32 and a second connecting end 33; the first connecting end 32 is fixedly connected with the first signal wire 34, the second connecting end 33 is fixedly connected with the second signal wire 35, the second signal wire 35 penetrates through the through hole 31 and is wound together with the first signal wire 34, and the tail ends of the first signal wire 34 and the second signal wire 35 are respectively connected with the circuit board 4.
Further, the first conductive sheet 1 and the second conductive sheet 2 are beryllium copper.
As shown in fig. 2, the first conductive sheet 1 further includes a shunt plate 11, a regulator 12, and a fixing plate 13, the shunt plate 11 is disposed on one side of the first conductive sheet 1, and the fixing plate 13 is disposed below the other side of the first conductive sheet 1; the adjuster 12 includes an adjusting hole 121 and an adjusting screw 122, the fixing plate 13 is L-shaped, the adjusting hole 121 is disposed on a surface of the fixing plate 13 parallel to the first conductive plate 1, and the adjusting screw 122 penetrates through the adjusting hole 121 and is perpendicular to the first conductive plate 1; the second conductive sheet 2 has the same structure as the first conductive sheet 1.
Further, the manganese copper sheet 3 comprises the following components in parts by weight: 85 parts of manganese-copper alloy, 10 parts of zinc oxide,1 part of lead, 0.5 part of boron, 0.4 part of iron, 0.1 part of beryllium and 0.1 part of bismuth. The resistivity of the manganese copper sheet 3 is 4.5 multiplied by 10-7πm。
Further, as shown in fig. 2, the first signal wire 34 includes a copper core conductor 341, a polyethylene insulation 342, a steel wire braid 343, and a flame retardant polyvinyl chloride sheath 344; the copper core conductor 341, the polyethylene insulation 342, the steel wire weaving 343 and the flame-retardant polyvinyl chloride sheath 344 are sequentially coated from inside to outside; the second signal line 35 has the same structure as the first signal line 34. In addition, gaps among the copper core conductor 341, the polyethylene insulation 342, the steel wire braid 343, and the flame retardant polyvinyl chloride sheath 344 are filled with petroleum jelly. The resistivity of the first signal line 34 and the second signal line 35 is 1.8 multiplied by 10-8 pi m.
Further, the diameter of the through hole 31 is 4.0mm, the distance between the through hole 31 and the first connection end 32 is 5.5mm, and the distance between the through hole 31 and the second connection end 33 is 6.0 mm.
Examples
The manganin shunt for the electronic electric energy meter is arranged in a shell of the electronic electric energy meter. Since the magnetic field generated by the ac power transmission and transformation facility during power transmission is radiated in the form of electromagnetic waves, the magnetic field is called a power frequency magnetic field. Due to the connection of the electronic electric energy meter with the cable, alternating power frequency electromagnetic field interference can be generated around the cable and the current divider.
The manganin shunt for the electronic electric energy meter is characterized in that a manganin sheet 3 is used as a sampling resistance sheet, two ends of the manganin sheet 3 are respectively connected with a first conducting sheet 1 and a second conducting sheet 1, the manganin shunt is connected with an outgoing end on one side edge of a relay through the first conducting sheet 1, and is connected with a current line port through the second conducting sheet 2. Such a routing structure can divide the entire loop into two regions. When the magnetic field parallel to the normal direction of the manganin shunt changes, because the two loops have the same area and the opposite directions, two induced currents with the same size and the opposite directions can be generated respectively and can be counteracted mutually. Thereby eliminating the magnetic field interference parallel to the normal direction of the manganin shunt.
In addition, the manganin shunt is disturbed by a magnetic field parallel to the manganin shunt. Through arranging the through hole 31 in the manganin sheet 3, the upper end and the lower end of the manganin sheet 3 are the first connecting end 32 and the second connecting end 33 which are fixedly connected with the first signal wire 34 and the second signal wire 35 respectively, and the second signal wire 35 passes through the through hole 31 and is wound together with the first signal wire 34, at the moment, the whole loop is equivalently divided into two loops with different directions, when the two loops are interfered by an alternating magnetic field parallel to the manganin shunt, the two loops respectively generate induced currents with different directions, and the induced currents can be mutually offset, so that the magnetic field interference parallel to the shunt can be eliminated by the structure.
In conclusion, the magnetic field interference parallel to the normal direction of the manganin shunt and the magnetic field interference parallel to the manganin shunt are eliminated through the method.
The invention has many applications, and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.
Claims (10)
1. The manganin shunt for the electronic electric energy meter is characterized by comprising a first conducting strip (1), a second conducting strip (2) and a manganin piece (3), wherein the first conducting strip (1), the manganin piece (3) and the second conducting strip (2) are sequentially connected and positioned on the same plane; a through hole (31) is formed in the middle of the manganese copper sheet (3), and a first connecting end (32) and a second connecting end (33) are respectively arranged at the upper end and the lower end of the manganese copper sheet (3); the first connecting end (32) is fixedly connected with the first signal wire (34), the second connecting end (33) is fixedly connected with the second signal wire (35), the second signal wire (35) penetrates through the through hole (31) and is wound together with the first signal wire (34), and the tail ends of the first signal wire (34) and the second signal wire (35) are respectively connected with the circuit board (4).
2. The manganin shunt for the electronic electric energy meter according to claim 1, wherein the first conducting strip (1) and the second conducting strip (2) are beryllium copper.
3. The manganin shunt for electronic electric energy meters according to claim 1, wherein the first conducting strip (1) further comprises a shunt plate (11), a regulator (12) and a fixing plate (13), the shunt plate (11) is arranged on one side of the first conducting strip (1), and the fixing plate (13) is arranged below the other side of the first conducting strip (1); the adjuster (12) comprises an adjusting hole (121) and an adjusting screw (122), the fixing plate (13) is L-shaped, the adjusting hole (121) is formed in one surface of the fixing plate (13) parallel to the first conducting strip (1), and the adjusting screw (122) penetrates through the adjusting hole (121) and is perpendicular to the first conducting strip (1); the structure of the second conducting strip (2) is the same as that of the first conducting strip (1).
4. The manganin shunt for the electronic electric energy meter according to claim 1, characterized in that the manganin sheet (3) consists of the following components in parts by mass: 85 parts of manganese-copper alloy, 10 parts of zinc oxide, 1 part of lead, 0.5 part of boron, 0.4 part of iron, 0.1 part of beryllium and 0.1 part of bismuth.
5. The manganin shunt for electronic electric energy meters according to claim 1, characterized in that the resistivity of the manganin sheet (3) is 4.5 x 10-7πm。
6. The manganin shunt for an electronic electric energy meter according to claim 1, wherein the first signal wire (34) comprises a copper core conductor (341), polyethylene insulation (342), steel wire weaving (343), flame retardant polyvinyl chloride sheath (344); the copper core conductor (341), the polyethylene insulation (342), the steel wire weaving (343) and the flame-retardant polyvinyl chloride sheath (344) are sequentially coated from inside to outside; the structure of the second signal line (35) is the same as that of the first signal line (34).
7. The manganin shunt for an electronic electric energy meter according to claim 6, wherein gaps between the copper core conductor (341), the polyethylene insulation (342), the steel wire weave (343) and the flame retardant polyvinyl chloride sheath (344) are filled with petroleum jelly.
8. The manganin shunt for the electronic electric energy meter and the application thereof according to claim 1, wherein the resistivity of the first signal wire (34) and the second signal wire (35) is 1.8 x 10-8πm。
9. The manganin shunt for electronic electric energy meters and the use thereof according to claim 1, characterized in that the diameter of the through hole (31) is 4.0mm, the distance between the through hole (31) and the first connection end (32) is 5.5mm, and the distance between the through hole (31) and the second connection end (33) is 6.0 mm.
10. Use of a manganin shunt for an electronic energy meter according to any one of claims 1 to 9, characterized in that the use is a current sampling device of an electronic energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911169248.XA CN110836986A (en) | 2019-11-25 | 2019-11-25 | Manganese-copper current divider for electronic electric energy meter and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911169248.XA CN110836986A (en) | 2019-11-25 | 2019-11-25 | Manganese-copper current divider for electronic electric energy meter and application thereof |
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| CN110836986A true CN110836986A (en) | 2020-02-25 |
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| CN201911169248.XA Pending CN110836986A (en) | 2019-11-25 | 2019-11-25 | Manganese-copper current divider for electronic electric energy meter and application thereof |
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| CN207571179U (en) * | 2017-12-05 | 2018-07-03 | 新沂市鑫洋电子有限公司 | A kind of grafting installing type manganese copper diverter |
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| CN203047886U (en) * | 2012-11-09 | 2013-07-10 | 中国石油天然气集团公司 | Lightning current shunt |
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Application publication date: 20200225 |