CN108845286B - Simultaneous calibration device for two current loops of single-phase electric energy meter - Google Patents
Simultaneous calibration device for two current loops of single-phase electric energy meter Download PDFInfo
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- CN108845286B CN108845286B CN201811021393.9A CN201811021393A CN108845286B CN 108845286 B CN108845286 B CN 108845286B CN 201811021393 A CN201811021393 A CN 201811021393A CN 108845286 B CN108845286 B CN 108845286B
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- 238000004804 winding Methods 0.000 claims abstract description 19
- 238000012795 verification Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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Abstract
The invention discloses a simultaneous verification device for two current loops of a single-phase electric energy meter, which comprises a current source and a plurality of current transformers for connecting the verified double-loop single-phase electric energy meter, wherein the current transformers are sequentially arranged, and the output end of a primary side winding of the former current transformer is connected with the input end of a primary side winding of the latter current transformer in series. The invention relates to a simultaneous checking device for two current loops of a single-phase electric energy meter, which adopts the following steps: the current transformer of the utility model 1 isolates the current of the main loop and the auxiliary loop, and loads the same phase and same magnitude current at the same time, only one current source is needed to realize the simultaneous checking of the two current loops of the single-phase electric energy meter, the control is simple, the cost is low, especially in the test of the double loop single-phase electric energy meter with small meter number, the advantage of simple control is more outstanding, and the problems of complex control and high cost existing in the current test of loading the same current to the two loops of the double loop single-phase electric energy meter at the same time by adopting the double current source mode are solved.
Description
[ field of technology ]
The invention relates to the technical field of electric energy meter calibration, in particular to a device for simultaneously calibrating two current loops of a single-phase electric energy meter.
[ background Art ]
The double-loop single-phase electric energy meter is characterized in that two loops of the meter can be used for metering, the two loops are a main loop (also called a phase line loop) and an auxiliary loop (also called a zero line loop), a wire inlet terminal of the main loop is connected with a power supply live wire, and a wire outlet terminal of the main loop is connected with a user live wire; the inlet wire terminal of the auxiliary loop is connected with the power zero line, and the outlet wire terminal is connected with the user zero line.
The two loops of the double-loop single-phase electric energy meter are simultaneously loaded with the same current for testing, and the double-current source mode is generally adopted for realizing the double-current source test, namely, the main loop uses one current source, and the zero line loop uses one current source. For this purpose, it is necessary to provide a device for checking two current loops of a single-phase electric energy meter at the same time.
[ invention ]
The invention aims to overcome the defects of the prior art, and provides a device for simultaneously checking two current loops of a single-phase electric energy meter, which solves the technical problems of complicated control and high cost in the prior art that a double-current source mode is adopted to simultaneously load the same current to two loops of the double-loop single-phase electric energy meter.
In order to achieve the above purpose, the invention provides a simultaneous verification device for two current loops of a single-phase electric energy meter, which comprises a current source and a plurality of current transformers for connecting the verified double-loop single-phase electric energy meter, wherein the current transformers are sequentially arranged, the output end of a primary side winding of the former current transformer is connected with the input end of a primary side winding of the latter current transformer in series, during verification, the input end and the output end of a secondary side winding of the current transformer are respectively connected with a user live wire terminal and a user zero wire terminal of the corresponding verified double-loop single-phase electric energy meter, the power zero wire terminal of the former current transformer is connected with the power live wire terminal of the latter current transformer, the input end of the primary side winding of the first current transformer is connected with the power live wire terminal of the last current transformer, and the power zero wire terminal of the last current transformer is connected with the double-loop single-phase electric energy meter.
Preferably, the number of the current transformers is the same as that of the double-loop single-phase electric energy meters which are checked at the same time.
Preferably, the number of the double-loop single-phase electric energy meters which are checked simultaneously is more than or equal to 2.
Preferably, the ratio of the number of turns of the primary winding to the number of turns of the secondary winding of the current transformer is 1:1.
the invention has the beneficial effects that: compared with the prior art, the device for simultaneously checking two current loops of the single-phase electric energy meter provided by the invention adopts the following steps: the current transformer of the utility model 1 isolates the current of the main loop and the auxiliary loop, loads the same phase and the same magnitude of current at the same time, realizes the simultaneous checking of the two current loops of the single-phase electric energy meter by only one current source, has simple control and low cost, especially has low cost in the test of the double-loop single-phase electric energy meter with small meter number, has more outstanding advantages of simple control, and solves the technical problems of complex control and high cost when the two loops of the double-loop single-phase electric energy meter are simultaneously loaded by adopting the double-current source mode at present.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a wiring diagram of a single-phase electric energy meter two current loop simultaneous verification device of the invention;
fig. 2 is a wiring diagram of an embodiment of the present invention.
[ detailed description ] of the invention
The present invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Referring to fig. 1, an embodiment of the present invention provides a simultaneous calibration device for two current loops of a single-phase electric energy meter, including a current source 1 and a plurality of current transformers 2 for connecting a calibrated dual-loop single-phase electric energy meter 3, wherein the plurality of current transformers 2 are sequentially arranged, an output end of a primary side winding of a previous current transformer 2 is connected in series with an input end of a primary side winding of a next current transformer 2, during calibration, an input end and an output end of a secondary side winding of the current transformer 2 are respectively connected with a user live wire terminal and a user zero wire terminal of a corresponding calibrated dual-loop single-phase electric energy meter 3, a power zero wire terminal of the dual-loop single-phase electric energy meter 3 connected with the previous current transformer 2 is connected with a power live wire terminal of the dual-loop single-phase electric energy meter 3 connected with the next current transformer 2, an input end of a primary side winding of the first current transformer 2 is connected with a power terminal of the dual-loop single-phase electric energy meter 3 connected with the current source 1, and an output end of the current transformer 2 is connected with a power live wire terminal of the dual-loop single-phase electric energy meter 3.
The number of the current transformers 2 is the same as that of the double-loop single-phase electric energy meters 3 which are checked at the same time, and the number of the double-loop single-phase electric energy meters 3 which are checked at the same time is more than or equal to 2.
In the embodiment of the invention, the number of the double-loop single-phase electric energy meters 3 which are checked simultaneously is 3, and the wiring diagram during checking is shown in fig. 2.
Further, the ratio of the number of turns of the primary winding to the number of turns of the secondary winding of the current transformer 2 is 1:1.
the invention relates to a simultaneous checking device for two current loops of a single-phase electric energy meter, which adopts the following steps: the current transformer of the utility model 1 isolates the current of the main loop and the auxiliary loop, loads the same phase and the same magnitude of current at the same time, realizes the simultaneous checking of the two current loops of the single-phase electric energy meter by only one current source, has simple control and low cost, especially has low cost in the test of the double-loop single-phase electric energy meter with small meter number, has more outstanding advantages of simple control, and solves the technical problems of complex control and high cost when the two loops of the double-loop single-phase electric energy meter are simultaneously loaded by adopting the double-current source mode at present.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The utility model provides a single-phase electric energy meter two current return circuits check-up device simultaneously which characterized in that: the power supply zero line terminal of the double-circuit single-phase electric energy meter (3) connected with the previous current transformer (2) is connected with the power supply live line terminal of the double-circuit single-phase electric energy meter (3) connected with the next current transformer (2), the input end of the primary side winding of the first current transformer (2) is connected with the live line of the current source (1), the output end of the primary side winding of the last current transformer (2) is connected with the user live line terminal and the user zero line terminal of the corresponding double-circuit single-phase electric energy meter (3) connected with the verification, and the output end of the primary side winding of the first current transformer (2) is connected with the power supply zero line terminal of the double-circuit single-phase electric energy meter (3) connected with the power supply zero line terminal of the single-phase electric energy meter (1) connected with the power supply zero line terminal of the single-phase electric energy meter (3) connected with the double-circuit single-phase electric energy meter.
2. The device for simultaneously verifying two current loops of a single-phase electric energy meter according to claim 1, wherein: the number of the current transformers (2) is the same as that of the double-loop single-phase electric energy meters (3) which are checked at the same time.
3. The device for simultaneously verifying two current loops of a single-phase electric energy meter according to claim 2, wherein: meanwhile, the number of the verified double-loop single-phase electric energy meters (3) is more than or equal to 2.
4. The device for simultaneously verifying two current loops of a single-phase electric energy meter according to claim 1, wherein: the ratio of the number of turns of the primary side winding coil to the number of turns of the secondary side winding coil of the current transformer (2) is 1:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811021393.9A CN108845286B (en) | 2018-09-03 | 2018-09-03 | Simultaneous calibration device for two current loops of single-phase electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811021393.9A CN108845286B (en) | 2018-09-03 | 2018-09-03 | Simultaneous calibration device for two current loops of single-phase electric energy meter |
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| CN108845286A CN108845286A (en) | 2018-11-20 |
| CN108845286B true CN108845286B (en) | 2024-01-02 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490809B (en) * | 2018-12-12 | 2020-12-25 | 威胜信息技术股份有限公司 | Unpaired calibration method for CT direct current loop |
| CN110907729A (en) * | 2019-11-29 | 2020-03-24 | 科大智能电气技术有限公司 | Power equipment testing method based on active compensation mutual inductor and three-phase source |
| CN114236456A (en) * | 2021-11-11 | 2022-03-25 | 云南电网有限责任公司 | Double-loop single-phase electric energy meter calibrating device and method |
| CN114089266B (en) * | 2022-01-21 | 2022-05-20 | 杭州炬华科技股份有限公司 | Meter calibration method and system suitable for single-phase double-loop electric energy meter |
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| CN205080251U (en) * | 2015-10-14 | 2016-03-09 | 大唐碧口水力发电厂 | Through -flow calibration system of current transformer secondary circuit |
| CN206757027U (en) * | 2017-04-14 | 2017-12-15 | 国网四川省电力公司电力科学研究院 | Live virtual load calibration equipment based on empty electric current device |
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2018
- 2018-09-03 CN CN201811021393.9A patent/CN108845286B/en active Active
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| RU100633U1 (en) * | 2010-04-30 | 2010-12-20 | Закрытое акционерное общество "Корпоративный институт электрического приборостроения "Энергомера" | DEVICE FOR TESTING SINGLE-PHASE MEASUREMENTS OF ELECTRIC POWER AND ENERGY |
| CN205080251U (en) * | 2015-10-14 | 2016-03-09 | 大唐碧口水力发电厂 | Through -flow calibration system of current transformer secondary circuit |
| CN206757027U (en) * | 2017-04-14 | 2017-12-15 | 国网四川省电力公司电力科学研究院 | Live virtual load calibration equipment based on empty electric current device |
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