CN201628736U - Metering box of electric energy meter - Google Patents
Metering box of electric energy meter Download PDFInfo
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- CN201628736U CN201628736U CN2010201372691U CN201020137269U CN201628736U CN 201628736 U CN201628736 U CN 201628736U CN 2010201372691 U CN2010201372691 U CN 2010201372691U CN 201020137269 U CN201020137269 U CN 201020137269U CN 201628736 U CN201628736 U CN 201628736U
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- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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Abstract
A metering box of an electric energy meter comprises an electric energy meter (3) and a low-voltage current transformer (1) with a secondary rated current of 1A. The secondary coil of the low-voltage current transformer and the current loop wiring terminals of the electric energy meter are connected; and the voltage of the electric energy meter directly accesses without passing the transformer. The 1A low-voltage current transformer and an electric single-phase energy meter can form a metering box of a single-phase electric energy meter; the 1A low-voltage current transformer and an electric three-phase three-wire energy meter can form a metering box of a three-phase three-wire electric energy meter; and the 1A low-voltage current transformer and an electric three-phase four-wire energy meter can form a metering box of a three-phase four-wire electric energy meter. The 1A current is adopted to access to the electric energy meter, the volume and weight of the current transformer, the wiring route of the current loop, and the volume and weight of the electric energy meter are greatly reduced, further the volume of the metering box is reduced. The metering box provided by the utility model is suitable for the electric energy meter to use.
Description
Technical field
The utility model relates to a kind of electronic electric energy meter batch meter, belongs to the electric-power metering technical field.
Background technology
Electric energy meter is a meter specially of measuring electric energy, considers from factors such as material cost, volume weight and versatilities, now adopts the rated maximum current of electric energy meter to stipulate by rules, should be not more than 50A.During the electric energy of the load current of measuring more than 50A, make Current Transformer usually.The effect of current transformer exactly will be bigger primary current be converted to the less secondary current of numerical value by certain no-load voltage ratio.As no-load voltage ratio is 100/5 current transformer, can be reality that the current transitions of 100A is the electric current of 5A.Secondary current is input to electric energy meter carries out electric energy metrical, again the energy value of gained be multiply by multiplying power and can obtain actual energy value.
Before electronic electric energy meter occurred, induction meter (stem-winder) was most widely used electric energy measurement instrument.The electric energy metrical principle of induction meter is as follows: behind induction meter incoming transport circuit, potential winding and current coil produce voltage power supply magnetic flux and current work magnetic flux respectively in voltage iron core and current ferric core.When voltage power supply magnetic flux and current work magnetic flux pass the ammeter rotating disk, induce the induction electromotive force E that lags behind their 90 degree respectively
UAnd E
I, E
UAnd E
IOn disk, produce eddy current Iu again respectively, and I
I, these two eddy current spatially do not coincide, and have phase differential on the time yet, and according to the electromagnetics principle, they all can produce the effect of power.This power moment that rotates on the ammeter disk gyrates direction of disk peace of electric energy meter.Rotating disk driving force size is directly proportional with size of current.
Induction meter will be guaranteed to start and measure under the 0.3%Ib condition, if the Current Transformer Secondary side current design that induction meter is matched is 1A, then 0.3%Ib has only 3mA, the driving force that watt-hour meter dial is formed is too little, and watt-hour meter dial is very big than hard-to-start or the error that causes.For this reason, the electric energy meter demarcation electric current that inserts through mutual inductor is designed to 5A basically, so the Current Transformer Secondary rated current is designed to 5A.
For many years until now, the low pressure measurement current transformer uses the design and use of secondary rated current as 5A always.The secondary rated current is that the measurement current transformer of 1A is only used in high-voltage electrical energy metering system.Thereby, also press the 5A design always, make and operation through the electric energy meter demarcation electric current that the low pressure mutual inductor inserts.
In recent years, the electronic electric energy meter development is very fast, by customer's approval.Because the electric current of electronic electric energy meter adopts circuit can't directly accept the electric current of 5A, so current transformer or shunt also need be installed in electronic electric energy meter the 5A electric current is become mA level electric current.Cause the electronic electric energy meter volume and weight to increase.Therefore, adopting 1A for electronic electric energy meter Current Transformer Secondary rated current is science very.
Summary of the invention
The purpose of this utility model is, electric current according to electronic electric energy meter adopts circuit can't directly accept the electric current of traditional 5A, and need other installation current transformer or shunt the 5A electric current to be become the defective of mA level electric current, the utility model is released the low-voltage current mutual inductor that a kind of electronic electric energy meter batch meter adopts 1A, thereby addresses this problem.
The technical solution of the utility model is that installation electronic electric energy meter and secondary rated current are the low-voltage current mutual inductor of 1A in the electronic electric energy meter batch meter.
The utility model is made up of by the low-voltage current mutual inductor of 1A electronic electric energy meter and secondary rated current, and the secondary circuit of current transformer links to each other with the current return binding post of electronic electric energy meter, and the voltage circuit of electronic electric energy meter is attempted by on the power supply.The low-voltage current mutual inductor of 1A and electronic single-phase electrical energy meter can be formed the single-phase electric energy meter batch meter; The low-voltage current mutual inductor of 1A and electronic type three-phase three-wire electric energy meter can be formed the three-phase three-wire electric energy meter batch meter; The low-voltage current mutual inductor of 1A can be formed three-phase and four-line electric energy meter batch meter mutually with electronic type three-phase and four-line electric energy meter.
The utility model beneficial effect compared with the prior art is that (1) under identical load, secondary current is that the transmission range of 1A mutual inductor is 25 times of 5A, can avoid selecting for use the mutual inductor of heavy load capacity like this, economical with materials, equipment volume and weight; (2) batch meter circuit power consumption reduces, the circuit power consumption be directly proportional by current squaring, secondary current is that the mutual inductor circuit power consumption of 5A is 25 times of 1A, promptly the circuit power consumption of 1A only 5A 4%, significantly reduced meaningless electric energy loss, reduced heating; (3) can reduce the electric current secondary loop conductor cross-section: if select 5A, 10VA mutual inductor for use, conductor cross-section needs 8mm as calculated
2, then select 1A, 2.5VA mutual inductor for use, conductor cross-section only needs 1.5mm
2(4) induction meter is replaced by electronic electric energy meter, if enter electronic electric energy meter with the 5A electric current, because of the current sampling circuit of a lot of ammeter inside can not bear the electric current of 5A, ammeter inside also need be installed three current transformers and the 5A electric current is become little electric current just can be entered sample circuit.If adopt the 1A electric current to enter electronic electric energy meter, then the line of the volume and weight of current transformer, current return footpath, electric energy meter volume and weight all significantly reduce, thereby the volume of batch meter also can dwindle.
The utility model is applicable to that electronic electric energy meter uses.
Description of drawings
Fig. 1 installs wiring schematic diagram for the single-phase electric energy meter batch meter;
Fig. 2 installs wiring schematic diagram for the three-phase three-wire electric energy meter batch meter;
Fig. 3 is that three-phase and four-line electric energy meter batch meter is installed wiring schematic diagram;
Picture in picture number expression: (1) secondary rated current is the low-voltage current mutual inductor of 1A; (2) load; (3) single-phase electric energy meter; (4) three-phase three-wire electric energy meter; (5) three-phase and four-line electric energy meter.
Embodiment
Embodiment 1:
Present embodiment is the single-phase electric energy meter batch meter, and it is made up of by the low-voltage current mutual inductor of 1A single-phase electric energy meter and secondary rated current, and Fig. 1 installs wiring schematic diagram for the single-phase electric energy meter batch meter.(1) for the secondary rated current is the low-voltage current mutual inductor of 1A; (2) be load; (3) be single-phase electric energy meter.The secondary circuit of current transformer is connected with the current return joint of single-phase electric energy meter, and the voltage circuit of single-phase electric energy meter inserts single phase poaer supply, the i.e. voltage of load (2).
Embodiment 2: present embodiment is the three-phase three-wire electric energy meter batch meter, and it is made up of by the low-voltage current mutual inductor of 1A three-phase three-wire electric energy meter and secondary rated current, and Fig. 2 installs wiring schematic diagram for the three-phase three-wire electric energy meter batch meter.(1) for the secondary rated current is the low-voltage current mutual inductor of 1A; (2) be load; (3) be three-phase three-wire electric energy meter.A, C that two low-voltage current mutual inductors are connected on three-phase power line respectively go up mutually, and its secondary circuit is connected with Ia, the Ic current return joint of three-phase three-wire electric energy meter respectively, and the AB voltage circuit of electric energy meter and CB voltage circuit also insert Uab, Ucb respectively.
Embodiment 3: present embodiment is a three-phase and four-line electric energy meter batch meter, and it is made up of by the low-voltage current mutual inductor of 1A three-phase and four-line electric energy meter and secondary rated current, and Fig. 3 is that three-phase and four-line electric energy meter batch meter is installed wiring schematic diagram.(1) for the secondary rated current is the low-voltage current mutual inductor of 1A; (2) be load; (3) be the three-phase and four-line electric energy meter.Three current transformers are connected on respectively on A, B, the C three-phase power line, and the secondary circuit of current transformer is connected with three current return joints of Ia, Ib, Ic of electric energy meter respectively, and the A of electric energy meter, B, three voltage circuits difference of C also insert Ua, Ub, Uc.
Claims (2)
1. electronic electric energy meter batch meter, it is characterized in that, described batch meter is made up of by the low-voltage current mutual inductor of 1A electronic electric energy meter and secondary rated current, the secondary circuit of low-voltage current mutual inductor links to each other with the current sampling circuit binding post of electronic electric energy meter, and the voltage circuit of electronic electric energy meter directly is attempted by on the power lead without mutual inductor.
2. a kind of electronic electric energy meter batch meter according to claim 1 is characterized in that the low-voltage current mutual inductor of 1A and electronic single-phase electrical energy meter can be formed the single-phase electric energy meter batch meter; The low-voltage current mutual inductor of 1A and electronic type three-phase three-wire electric energy meter can be formed the three-phase three-wire electric energy meter batch meter; The low-voltage current mutual inductor of 1A can be formed three-phase and four-line electric energy meter batch meter mutually with electronic type three-phase and four-line electric energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201372691U CN201628736U (en) | 2010-03-22 | 2010-03-22 | Metering box of electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201372691U CN201628736U (en) | 2010-03-22 | 2010-03-22 | Metering box of electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201628736U true CN201628736U (en) | 2010-11-10 |
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ID=43060134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201372691U Expired - Fee Related CN201628736U (en) | 2010-03-22 | 2010-03-22 | Metering box of electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201628736U (en) |
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2010
- 2010-03-22 CN CN2010201372691U patent/CN201628736U/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 | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121206 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121206 Address after: 330000 No. 88 min Qiang Road, private science and Technology Park, Jiangxi, Nanchang Patentee after: Jiangxi Electric Power Science Academy Patentee after: State Grid Corporation of China Address before: 330000 No. 88 min Qiang Road, private science and Technology Park, Jiangxi, Nanchang Patentee before: Jiangxi Electric Power Science Academy |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101110 Termination date: 20180322 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |