CN115356676A - Phase line and zero line synchronous calibration method for single-phase ammeter - Google Patents
Phase line and zero line synchronous calibration method for single-phase ammeter Download PDFInfo
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- CN115356676A CN115356676A CN202210922179.0A CN202210922179A CN115356676A CN 115356676 A CN115356676 A CN 115356676A CN 202210922179 A CN202210922179 A CN 202210922179A CN 115356676 A CN115356676 A CN 115356676A
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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
Abstract
The invention discloses a synchronous calibration method for a phase line and a zero line of a single-phase ammeter, which is characterized in that a current transformer is connected in series to a phase line loop of a current source and an electric energy meter; the transformation ratio of the current transformer is 15; and the secondary side induced current of the current transformer is connected with a zero line loop of the electric energy meter. In the method disclosed by the invention, a phase line loop and a zero line loop of the electric energy meter simultaneously pass through current; when the electric energy meter is calibrated, only the current source of the meter calibration platform body needs to be connected to a phase line loop of the electric energy meter, and phase lines and zero lines can be calibrated simultaneously. The calibration process of the calibration table body only needs to be executed once, the calibration method is simple, and the production efficiency of the electric energy meter is improved.
Description
Technical Field
The invention relates to the technical field of single-phase electric energy meter calibration methods, in particular to a method for synchronously calibrating a phase line zero line of a single-phase ammeter by using a current source.
Background
In the production of the single-phase electric energy meter, the phase line and the zero line are required to be calibrated to be qualified before leaving the factory. No. 1 and No. 2 terminals of the electric energy meter are input and output wiring ends of a phase line, and No. 3 and No. 4 terminals are input and output wiring ends of a zero line. The calibration of the phase line and the zero line of the single-phase electric energy meter generally uses a meter calibration platform body.
The existing meter calibration table body is internally provided with only one current source. When the electric energy meter calibrates the metering parameters, the phase line and the zero line need to be calibrated separately and independently. When the phase line is calibrated, the current source of the calibration table body is connected to the phase line loop of the electric energy meter, and the phase line of the electric energy meter is calibrated. And after the phase line calibration is finished, switching the current source of the calibration table body into the zero line loop of the electric energy meter, and calibrating the zero line of the electric energy meter.
Because the interior of the meter calibration table body is only provided with one current source, the current of the No. 1,2 terminal cannot be directly connected into the No. 3,4 return circuit of the zero line current at the same time. Meanwhile, direct access can cause short circuit of a phase line and a zero line of the electric energy meter, and the meter calibration table body is not electrified or burnt.
Therefore, in the prior art, one electric energy meter is calibrated, the calibration process of the meter calibration table body needs to be executed twice, and the production efficiency is relatively low.
In view of the above, it is desirable to provide a new method for calibrating the zero line of the phase line of a single-phase ammeter, so as to improve the production efficiency of the ammeter.
Disclosure of Invention
In order to solve the problems, the invention provides a method for synchronously calibrating the phase line and the zero line of the single-phase ammeter.
Specifically, the invention provides a method for synchronously calibrating a phase line and a zero line of a single-phase ammeter, which is characterized in that a current transformer is connected to a phase line loop of a current source and an electric energy meter in series; and the secondary side induction current of the current transformer is connected with a zero line loop of the electric energy meter. In the existing single-phase electric energy meter, a phase line loop is generally used for metering; the zero line loop only monitors the magnitude of the current value, and is used for comparing the difference between the phase line current and the zero line current and used as a judgment basis for electricity stealing. Therefore, the current measurement requirement of the zero line circuit is not high relative to the current measurement requirement of the phase line loop, and during production, the zero line loop can meet the accuracy within the measuring range of the electric energy meter only by calibrating the small current point and the basic current point of the zero line loop without calibrating the large current point of the zero line loop. In the production process of the electric energy meter, the method disclosed by the invention synchronously calibrates the basic current point of the zero line when calibrating a large current point for a phase line; and when the basic current point of the phase line is calibrated, synchronously calibrating the small current point of the zero line. The method can synchronously calibrate the zero line of the phase line of the single-phase ammeter by using only one current source, and improves the production efficiency of the electric energy meter.
In some embodiments, the phase circuit is: the positive electrode of the current source is connected with a phase line input wiring terminal of the electric energy meter, and a phase line output wiring terminal of the electric energy meter is connected with the negative electrode of the current source after being connected with the current transformer in series; the zero line loop is as follows: the secondary side induced current of the current transformer is connected with a zero line input terminal and a zero line output terminal of the electric energy meter.
In some embodiments, the electric energy meters are provided with a plurality of current transformers and the electric energy meters, the number of the current transformers is the same as that of the electric energy meters, the positive pole of the current source is connected to the phase line input terminal of the first electric energy meter, the phase line output terminal of the electric energy meter is connected to the phase line input terminal of the next electric energy meter after being connected to the first current transformer in series, the steps are repeated, and the phase line output terminal of the last electric energy meter is connected to the negative pole of the current source after being connected to the last current transformer in series; and the secondary side induced current of each current transformer is connected with a zero line input terminal and a zero line output terminal of the corresponding electric energy meter.
In some embodiments, the range selection of the current transformer covers the range of the power meter.
In some embodiments, the current transformer has a transformation ratio of 15, such as 5A for phase line calibration 75A current, for synchronous calibration of neutral current 5A; when the phase line calibrates the current of 3A, the zero line current is synchronously calibrated to be 0.2A. The transformation ratio of the current transformer may be other. Only need to consider, when the transformation ratio of current transformer is less, output the current of same precision requirement, the size of current transformer can increase, not easy installation, and with high costs, does not satisfy the original intention that the invention created. When the transformation ratio of the current transformer is larger, the current value of the zero line loop is too small when the phase line loop of the electric energy meter is calibrated, which also does not meet the calibration requirement of the basic current of the zero line loop.
Compared with the prior art, the invention has the beneficial effects that:
in the method disclosed by the invention, a phase line loop and a zero line loop of the electric energy meter simultaneously pass through current; when the electric energy meter is calibrated, only the current source of the meter calibration platform body needs to be connected to a phase line loop of the electric energy meter, and the phase line and the zero line can be calibrated simultaneously.
The calibration process of the meter calibration platform body only needs to be executed once, the calibration method is simple, and the production efficiency of the electric energy meter is improved.
In addition, the invention can also use one current source to calibrate the phase line and the zero line of a plurality of electric energy meters simultaneously, thereby greatly improving the production efficiency of the electric energy meters.
Drawings
Fig. 1 is a schematic diagram of a wiring structure of a phase line and zero line synchronous calibration method of a single-phase ammeter provided by the invention.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The invention provides a method for synchronously calibrating a phase line and a zero line of a single-phase ammeter, which is characterized in that a current transformer is connected to a phase line loop of a current source and an electric energy meter in series. The secondary side induced current of the current transformer is connected with a zero line loop of the electric energy meter.
The phase line loop is as follows: the positive pole of the current source is connected with the phase line input wiring terminal of the electric energy meter, and the phase line output wiring terminal of the electric energy meter is connected with the negative pole of the current source after being connected with the current transformer in series.
The zero line loop is as follows: the secondary side induced current of the current transformer is connected with a zero line input terminal and a zero line output terminal of the electric energy meter. According to the method, the phase line and the zero line of the electric energy meter can be calibrated simultaneously by using one current source.
A phase line loop and a zero line loop of the electric energy meter pass current at the same time; when one electric energy meter is calibrated, only a current source of the meter calibrating platform body is connected to a phase line loop of the electric energy meter, and then the current source is connected with a zero line loop through a current transformer; and the phase line and the zero line can be calibrated simultaneously.
The invention can also use one current source to calibrate the phase line and the zero line of a plurality of electric energy meters at the same time, and is further explained by the following embodiments.
Example 1
In the embodiment, 6 electric energy meters are arranged, namely 1-6 electric energy meters; the number of the current transformers and the number of the electric energy meters are the same, and are also 6, namely the current transformers CT1-CT6.
As shown in figure 1, phase line input wiring terminals of the electric energy meters 1-6 are terminals No. 1, phase line output wiring terminals are terminals No. 2, zero line input wiring terminals are terminals No. 3, and zero line output wiring terminals are terminals No. 4.
And (2) connecting the positive electrode of the current source of the meter calibration platform body into the terminal 1 of the electric energy meter 1, connecting the terminal 2 of the electric energy meter 1 in series with the current transformer CT1, connecting the current transformer CT1 into the terminal 1 of the electric energy meter 2, connecting the terminal 2 of the electric energy meter 2 in series with the current transformer CT2, connecting the current transformer CT2 into the next electric energy meter, repeating the steps, and finally connecting the terminal 2 of the electric energy meter 6 into the negative electrode of the current source of the meter calibration platform body after connecting the terminal 2 of the electric energy meter 6 in series with the current transformer CT6 to form a current closed loop. The number of current meters connected in the whole loop is determined by the load capacity of the current source.
The current transformers CT1-CT6 adopt 15 parts with high precision: 1 current transformer. The current transformer CT can adopt a current transformer BH-0.66 75A/5A of the high precision 15. Only the range selection of the current transformers CT1-CT6 is required to cover the range of the electric energy meters 1-6. The secondary side induction currents generated by the current transformers CT1-CT6 are respectively connected to No. 3 and No. 4 terminals of the corresponding electric energy meters 1-6.
In specific implementation, the voltage source is connected with a multi-output voltage transformer PT to supply power to the electric energy meters 1-6, so that the electric energy meters work normally. And the output end of the PT of the voltage transformer is connected with a No. 1 terminal and a No. 3 terminal of the electric energy meters 1-6.
By the method disclosed in the embodiment, the phase line loop and the zero line loop of the electric energy meters 1 to 6 are simultaneously passed with current, thereby realizing the simultaneous calibration of the phase line and the zero line of the electric energy meters 1 to 6.
The calibration process is only required to be executed once, the calibration method is simple, and the production efficiency of the electric energy meter is greatly improved.
While only certain embodiments of the present invention have been described, it should be understood that various other changes and modifications could be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (5)
1. A synchronous calibration method for a phase line and a zero line of a single-phase ammeter is characterized in that a current transformer is connected in series to a phase line loop of a current source and an electric energy meter; and the secondary side induced current of the current transformer is connected with a zero line loop of the electric energy meter.
2. The method for synchronously calibrating the phase line and the zero line of the single-phase ammeter according to claim 1, wherein the phase line loop comprises: the positive pole of the current source is connected with a phase line input terminal of the electric energy meter, and a phase line output terminal of the electric energy meter is connected with a current transformer in series and then connected with the negative pole of the current source; the zero line loop is as follows: and the secondary side induced current of the current transformer is connected with a zero line input terminal and a zero line output terminal of the electric energy meter.
3. The method for synchronously calibrating the phase line and the zero line of the single-phase ammeter according to claim 2, wherein the number of the electric energy meters is multiple, the number of the current transformers and the number of the electric energy meters are the same, the positive electrode of the current source is connected with the input terminal of the phase line of the first electric energy meter, the output terminal of the phase line of the electric energy meter is connected with the input terminal of the phase line of the next electric energy meter after being connected with the first current transformer in series, the steps are repeated, and the output terminal of the phase line of the last electric energy meter is connected with the negative electrode of the current source after being connected with the last current transformer in series; and the secondary side induced current of each current transformer is connected with a zero line input terminal and a zero line output terminal of the corresponding electric energy meter.
4. The method for synchronously calibrating the phase line and the zero line of the single-phase ampere meter according to claim 3, wherein the range of the current transformer is selected to cover the range of the electric energy meter.
5. The method for synchronously calibrating the zero line of the phase line of the single-phase ampere meter according to any one of claims 1 to 4, wherein the transformation ratio of the current transformer is 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210922179.0A CN115356676A (en) | 2022-08-02 | 2022-08-02 | Phase line and zero line synchronous calibration method for single-phase ammeter |
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| CN202210922179.0A CN115356676A (en) | 2022-08-02 | 2022-08-02 | Phase line and zero line synchronous calibration method for single-phase ammeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932385A (en) * | 2022-12-12 | 2023-04-07 | 怀化建南机器厂有限公司 | Residual current monitoring method and system and single-phase intelligent electric energy meter |
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- 2022-08-02 CN CN202210922179.0A patent/CN115356676A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932385A (en) * | 2022-12-12 | 2023-04-07 | 怀化建南机器厂有限公司 | Residual current monitoring method and system and single-phase intelligent electric energy meter |
| CN115932385B (en) * | 2022-12-12 | 2023-11-17 | 怀化建南机器厂有限公司 | Residual current monitoring method and system and single-phase intelligent electric energy meter |
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