CN203178328U - Electric energy meter and current sampling apparatus - Google Patents
Electric energy meter and current sampling apparatus Download PDFInfo
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- CN203178328U CN203178328U CN 201320109502 CN201320109502U CN203178328U CN 203178328 U CN203178328 U CN 203178328U CN 201320109502 CN201320109502 CN 201320109502 CN 201320109502 U CN201320109502 U CN 201320109502U CN 203178328 U CN203178328 U CN 203178328U
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Abstract
The utility model provides an electric energy meter and a current sampling apparatus. The current sampling apparatus comprises a sampling resistor matrix, a first lead and a second lead. Two sides of the sampling resistor matrix are respectively provided with a first interconnecting piece and a second interconnecting piece; one end of the first lead is in connection with the first interconnecting piece; one end of the second lead is in connection with the second interconnecting piece; the other ends of the first lead and the second lead are used for connecting with an input end port of a metering circuit. The sampling resistor matrix is provided with a through hole, out of which the first lead penetrates; the part of the first lead penetrating out of the through hole is parallel with the second lead or partially spirally twists and extends. According to the above mode, the current sampling apparatus has higher resistance to alternate magnetic field interference; current sampling errors caused by induced current generated by external or internal magnetic fields are effectively improved; an isolation mechanism effectively avoids burnout of leads caused by overheating of a sampling resistor matrix.
Description
Technical field
The utility model relates to the electric energy metrical product scope, particularly relates to a kind of electric energy meter and current sampling device thereof.
Background technology
Shunt is the equipment that electric current is measured, and is widely used in voltage or current sample detection in electronics, communication, the commercial production.Existing shunt is generally manganese copper diverter, adopts will the flow through current conversion of manganese copper diverter of sampling lead to become voltage to sample.
The signal sampling precision of shunt is interfered and variation easily, for example, in electric energy meter, can can be divided into internal interference source and external interference source two parts to what the sampling unit generation was disturbed, wherein the internal interference source mainly is the transformer leakage flux, and external interference source is exactly to come from the outer magnetic field of electric energy meter.As described above, electric energy meter is after converting current signal to voltage signal by manganese copper diverter, is input to computation chip again and carries out computing.According to Ohm law, the voltage of manganese copper diverter sampling end is: V=IR.And when disturbing leakage flux to pass manganese copper diverter, manganese copper diverter can produce an induced electromotive force V ', has disturbed the actual sampled voltage signal that is input to computation chip, thereby error is increased.
In sum, in the prior art, manganese copper diverter is the drag deficiency to alternating magnetic field in when work, and being easy to is influenced by inner or outside alternating magnetic field, thereby electric energy metrical instrument such as electric energy meter is produced than mistake, thereby loses accuracy.
The utility model content
The technical matters that the utility model mainly solves provides a kind of electric energy meter and current sampling device thereof, to improve alternating magnetic field is had higher drag, improves measuring accuracy.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of current sampling device is provided, and this current sampling device comprises sampling resistor matrix, first lead and second lead.Sampling resistor matrix both sides respectively are provided with first connecting portion, second connecting portion, and first lead, one end connects first connecting portion, and second lead, one end connects second connecting portion, and the other end of first lead, second lead is used for connecing the metering circuit input port.Wherein be provided with through hole in the sampling resistor matrix, first lead is passed by through hole, and first lead passes part arranged side by side or stranded extension of part spiral with second lead of through hole.
Wherein, current sampling device further comprises interrupter; interrupter is to be arranged on first lead or to be arranged at protective sleeve in the through hole of sampling resistor matrix, and is heat insulation to carry out between first lead and sampling resistor matrix, or further insulate or fix first lead.
Wherein, through hole is positioned at the center on the surface of sampling resistor matrix.
Wherein, current sampling device further comprises radome, and radome is sheathed on first lead, second lead away from the part of sampling resistor matrix.
Wherein, first connecting portion and second connecting portion are arranged at the diagonal position of sampling resistor matrix.
For solving the problems of the technologies described above, another technical scheme that the utility model adopts is: a kind of electric energy meter is provided, and this electric energy meter comprises current sampling device, and current sampling device comprises sampling resistor matrix and first lead, second lead.Sampling resistor matrix both sides respectively are provided with first connecting portion, second connecting portion, and first lead, one end connects first connecting portion, and second lead, one end connects second connecting portion.Wherein be provided with through hole in the sampling resistor matrix, first lead is passed by through hole, and first lead passes part arranged side by side or stranded extension of part spiral with second lead of through hole.
Wherein, current sampling device further comprises interrupter; interrupter is to be arranged on first lead or to be arranged at protective sleeve in the through hole of sampling resistor matrix, and is heat insulation to carry out between first lead and sampling resistor matrix, or further insulate or fix first lead.
Wherein, through hole is positioned at the center on the surface of sampling resistor matrix.
Wherein, current sampling device further comprises radome, and radome is sheathed on first lead, second lead away from the part of sampling resistor matrix.
Wherein, the tie point of the tie point of first lead and first connecting portion and second lead and second connecting portion is arranged at the diagonal position of sampling resistor matrix.
The beneficial effects of the utility model are: the situation that is different from prior art, electric energy meter of the present utility model and current sampling device thereof are owing to sampling resistor matrix is wherein run through by first lead, thereby make current sampling device have higher drag to the interference of alternating magnetic field, effectively improved the current sample error that the induced current that produces because of inside or external magnetic field causes.And, further, owing to be provided with for heat insulation interrupter between first lead and the sampling resistor matrix, effectively prevented because the overheated situation that first lead is burnt out of sampling resistor matrix takes place.
Description of drawings
Fig. 1 is the structural representation of the current sampling device of the utility model first embodiment;
Fig. 2 is the structural representation of the sampling resistor matrix of current sampling device among Fig. 1;
Fig. 3 is the side view of the current sampling device among Fig. 1.
Embodiment
See also Fig. 1, Fig. 1 is the structural representation of the current sampling device of the utility model first embodiment.In the present embodiment, current sampling device 10 comprises sampling resistor matrix 11, interrupter 12, first connecting portion 13, second connecting portion 14, first lead 15, second lead 16, junction block 17, radome 18 and privates 19.
Further consult Fig. 2, Fig. 2 is the structural representation of the sampling resistor matrix of current sampling device among Fig. 1.First connecting portion 13 and second connecting portion 14 are arranged at the both sides of sampling resistor matrix 11 respectively.The end that one end of first lead 15 connects first connecting portion, 13, the second leads 16 connects second connecting portion, 14, the first leads 15 and is connected the metering circuit input port with the other end of second lead 16.Specifically, the current sampling device 10 of present embodiment is manganese copper diverter, and sampling resistor matrix 11 is the copper-manganese resistive element, and the both sides of sampling resistor matrix 11 respectively are provided with red copper.First connecting portion 13 and second connecting portion 14 are the sampling end points, and first lead 15, second lead 16 are sample line.First connecting portion 13 and second connecting portion 14 are arranged on the sampling resistor matrix 11 in the present embodiment.In other embodiments, first connecting portion 13 and second connecting portion 14 also can directly be arranged on the red copper of sampling resistor matrix 11 both sides.In the present embodiment, first connecting portion 13 and second connecting portion 14 are arranged at the diagonal position of sampling resistor matrix 11.
In the present embodiment, the center on the surface of sampling resistor matrix 11 is provided with through hole 111.First lead 15 is passed by through hole 111, and first lead 15 passes the part and the stranded extension of second lead, 17 part spirals of through hole 111.First lead 15 is arranged in the through hole 111 near the part of first connecting portion 13.Consult Fig. 3, Fig. 3 is the side view of the current sampling device among Fig. 1.By Fig. 3 we as can be seen, through hole 111 after first lead 15 passes through hole 111, carries out the stranded extension of spiral with second lead 16 for straight line runs through the perforation of sampling resistor matrix 11 again.
In order to prevent that the part that first lead 15 is arranged in the through hole 111 from burning out owing to sampling resistor matrix 11 overheated first leads 15 that make, and therefore arranges heat-shield mechanism 12 at first lead 15.In the present embodiment, heat-shield mechanism 12 is for being arranged at the protective sleeve on first lead 15, and is heat insulation to carry out between first lead 15 and sampling resistor matrix 11.Interrupter 12 except carry out heat insulation, can also be used for insulation or fix first lead 15.In other embodiments, also heat-shield mechanism 12 can be arranged in the through hole 111.Protective sleeve is preferably varnished tube, also can be for being made by insulation heat-barrier materials such as glass fibre, porcelain, and also can be at the subregion epoxy resin coating of first lead 15 or sampling resistor matrix 11, to form hot interrupter 12.Perhaps, also can adopt in the above-mentioned material at least both in conjunction with forming heat-shield mechanism 12.Therefore above-mentioned material can be fixed first lead 15 because all possessing the hardware effect.And above-mentioned material all is insulating material.
One end of privates 19 is connected on the red copper of sampling resistor matrix 11 1 sides.Consult Fig. 3, on the 3rd connecting portion 30 on privates 19 concrete connections and the red copper.Further consult Fig. 1, junction block 17 is arranged on the 3rd connecting portion 30 on the red copper of sampling resistor matrix 11 and sampling resistor matrix 11 1 sides, the position of corresponding privates 19.Junction block 17 is used for extended privates 19 on the red copper of sampling resistor matrix 11 1 sides is fixed.In the present embodiment, junction block 17 is sheathed on privates 19 and does not carry out the stranded part of spiral, and contiguous or contact sampling resistor matrix 11.In other embodiments, first lead 15 and second lead 16 also can be fixed by junction block 17, junction block 17 can be arranged at first connecting portion 13 and second connecting portion, 14 places.In other embodiments, privates 19 and the 3rd connecting portion 30 also can be arranged on the red copper of opposite side of sampling resistor matrix 11.
In the present embodiment, privates 19 is ground wire, first lead 15, second lead 16 and the stranded extension of privates 19 part spirals.In other embodiments, first lead 15, second lead 16 can extend side by side with privates 19, and it is stranded not carry out spiral.When first lead and second lead extended side by side, preferred first lead and second lead reclined and arrange or adjacent setting.Because arrange if extend side by side, when current sampling device 10 work, first lead 15, second lead, 16 privates 19 with between can form loop, the increase sampling error.Therefore, present embodiment is with privates 19 and first lead 15, the stranded extension of second lead, 16 1 super helixs, to reduce this influence.In other embodiments, also can only first lead 15 and second lead 16 be carried out the stranded extension of part spiral.
In the present embodiment, radome 18 is sheathed on the part of first lead 15, second lead 16 and the stranded extension of privates 19 spirals.In other embodiments, radome 18 can be sheathed on first lead 15 and second lead 16 according to specific circumstances away from the part of sampling resistor matrix 11.Radome 18 can shield electric field or magnetic field, with the influence to first lead 15, second lead 16 or privates 19 of further reduction electric field or magnetic field.
In other embodiments, can use support to come first lead 15 and second lead 16 are positioned.This support can be used for preventing that first lead 15 is not arranged at part in the through hole 111 or the part of second lead 16 touches sampling resistor matrix 11.Only need to use high temperature resistant, the material that pliability is good is made support, is installed on then on the correspondence position of current sampling device 10 to get final product.For example, can adopt PPS plastics (polyphenylene sulfide, Phenylene sulfide) to make support.
The utility model further provides the electric energy meter that uses above-mentioned current sampling device.
Electric energy meter of the present utility model and existing electric energy meter carry out test comparison:
Description according to the amount of the influence experiment that produces about the ammeter error of outer magnetic induction density 0.5mT among the CNS GB/T17215-2002 " 1 grade exchange active electric energy meter with 2 grades of state types ":
The magnetic induction density of outside 0.5mT is produced by the electric current that imposes on instrument voltage same frequency, and under the condition of worst phase place and direction, the change amount that instrument is represented with percent error should not surpass setting.
The ring current coil that instrument can be placed in the center of can using produces this magnetic induction field.Toroidal mean diameter is 1m, and the cross section is rectangle, and relative diameter has less radial width.Magnetic field intensity is 400 ampere-turns.
Experiment condition: use same single-phase electronic energy meter, successively change existing current sampling device and current sampling device of the present utility model, disturbing the strongest point to carry out the electric energy meter error experiment.
Experimental result:
| The current sampling device sample | 0.5mT error changes under the induction |
| The conventional current sampling apparatus | 1.7% |
| Current sampling device after the improvement | 0.2% |
| The current sampling device that adds radome after the improvement | 0.05% |
This shows, because after resistance base body run through by first lead, the precision of current sampling device obviously improved.
By the way, electric energy meter of the present utility model and current sampling device thereof are owing to sampling resistor matrix is wherein run through by first lead, thereby make current sampling device have higher drag to the interference of alternating magnetic field, effectively improved the current sample error that the induced current that produces because of inside or external magnetic field causes.And, further, owing to be provided with for heat insulation interrupter between first lead and the sampling resistor matrix, effectively prevented because the overheated situation that first lead is burnt out of sampling resistor matrix takes place.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (10)
1. a current sampling device is characterized in that, described current sampling device comprises sampling resistor matrix, first lead and second lead;
Described sampling resistor matrix both sides respectively are provided with first connecting portion, second connecting portion, described first lead, one end connects first connecting portion, described second lead, one end connects second connecting portion, and the other end of described first lead, second lead is used for connecing the metering circuit input port;
Be provided with through hole in the wherein said sampling resistor matrix, described first lead is passed by described through hole, and described first lead passes part arranged side by side or stranded extension of part spiral with described second lead of described through hole.
2. current sampling device according to claim 1; it is characterized in that; described current sampling device further comprises interrupter; described interrupter is to be arranged on described first lead or to be arranged at protective sleeve in the described through hole of described sampling resistor matrix; heat insulation between described first lead and described sampling resistor matrix, to carry out, or further insulate or fixing described first lead.
3. current sampling device according to claim 1 is characterized in that, described through hole is positioned at the center on the surface of described sampling resistor matrix.
4. current sampling device according to claim 1 is characterized in that, described current sampling device further comprises radome, and described radome is sheathed on described first lead, described second lead away from the part of described sampling resistor matrix.
5. current sampling device according to claim 1 is characterized in that, described first connecting portion and described second connecting portion are arranged at the diagonal position of described sampling resistor matrix.
6. an electric energy meter is characterized in that, described electric energy meter comprises current sampling device, and described current sampling device comprises sampling resistor matrix and first lead, second lead;
Described sampling resistor matrix both sides respectively are provided with first connecting portion, second connecting portion, and described first lead, one end connects first connecting portion, and described second lead, one end connects second connecting portion;
Be provided with through hole in the wherein said sampling resistor matrix, described first lead is passed by described through hole, and described first lead passes part arranged side by side or stranded extension of part spiral with described second lead of described through hole.
7. electric energy meter according to claim 6; it is characterized in that; described current sampling device further comprises interrupter; described interrupter is to be arranged on described first lead or to be arranged at protective sleeve in the described through hole of described sampling resistor matrix; heat insulation between described first lead and described sampling resistor matrix, to carry out, or further insulate or fixing described first lead.
8. electric energy meter according to claim 6 is characterized in that, described through hole is positioned at the center on the surface of described sampling resistor matrix.
9. electric energy meter according to claim 6 is characterized in that, described current sampling device further comprises radome, and described radome is sheathed on first lead, second lead away from the part of described sampling resistor matrix.
10. electric energy meter according to claim 6 is characterized in that, the tie point of the tie point of described first lead and described first connecting portion and described second lead and described second connecting portion is arranged at the diagonal position of described sampling resistor matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320109502 CN203178328U (en) | 2013-03-11 | 2013-03-11 | Electric energy meter and current sampling apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320109502 CN203178328U (en) | 2013-03-11 | 2013-03-11 | Electric energy meter and current sampling apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203178328U true CN203178328U (en) | 2013-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320109502 Expired - Fee Related CN203178328U (en) | 2013-03-11 | 2013-03-11 | Electric energy meter and current sampling apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203178328U (en) |
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2013
- 2013-03-11 CN CN 201320109502 patent/CN203178328U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20160311 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |