CN217238204U - Electric energy metering device based on magnetic valve type current transformer sampling - Google Patents
Electric energy metering device based on magnetic valve type current transformer sampling Download PDFInfo
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- CN217238204U CN217238204U CN202122831900.9U CN202122831900U CN217238204U CN 217238204 U CN217238204 U CN 217238204U CN 202122831900 U CN202122831900 U CN 202122831900U CN 217238204 U CN217238204 U CN 217238204U
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Abstract
The utility model belongs to the technical field of electric energy metering, and discloses an electric energy metering device based on magnetic valve type current transformer sampling, which comprises a magnetic valve type current transformer, a voltage sampling device, a metering chip and an energy taking device; the output end of the magnetic valve type current transformer and the output end of the voltage sampling device are respectively connected with the metering chip; the outer end of the energy taking device is connected with a mains supply, and the other end of the energy taking device is respectively connected with the magnetic valve type current transformer, the voltage sampling device and the metering chip; the magnetic valve type current transformer comprises a primary winding, a secondary load, a main iron core, a magnetic field sensor and a signal processing device. The utility model can measure the alternating current and direct current; the current transformer saturation caused by direct current magnetic biasing or inter-harmonic and sub-harmonic can be compensated, the accuracy of electric energy metering is improved, and therefore economic loss caused by the current transformer saturation is reduced.
Description
Technical Field
The utility model belongs to the technical field of the electric energy measurement, especially, relate to an electric energy metering device based on sampling of magnetic valve formula current transformer.
Background
At present, electric energy metering devices can be classified into ac electric energy metering devices and dc electric energy metering devices according to the nature of the electric quantity to be metered.
The ac power metering device can be divided into two categories according to the structural categories: an induction electric energy meter and a static electric energy meter. The induction system electric energy meter is designed by adopting a magnetic induction principle and comprises a voltage coil, a current coil, an aluminum disc and a rotating shaft thereof, damping magnetic steel, a counting mechanism and the like. However, the inductive electric energy meter can only be used in an alternating current circuit and is susceptible to electromagnetic interference. The static electric energy meter is also called an electronic electric energy meter, and is divided into an analog multiplier type and a sampling digital multiplier type. The direct current electric energy metering device generally adopts a shunt. However, the shunt generates a large active loss when a large current flows through, which not only affects the metering, but also needs to consider the heat dissipation problem. The electromagnetic current transformer has the advantages of low cost, primary side and secondary side isolation and low loss, and is widely used for alternating current energy metering. However, as the number of consumer power electronic devices increases, the problem of dc current magnetic bias caused by power electronic switching devices becomes more and more prominent. When primary side current contains direct current magnetic bias current, the electromagnetic current transformer can be saturated, the specific difference and the angular difference of output signals are rapidly increased, and output waveforms can be seriously distorted in serious conditions, so that large errors of electric energy metering are caused, and economic losses are brought.
Therefore, there is a need for an electric energy metering device that can deal with the problem of metering loss due to dc magnetic bias and can simultaneously perform ac/dc electric energy metering.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) the ac power metering device can only be used in ac circuits and is susceptible to electromagnetic interference.
(2) The direct current electric energy metering device usually adopts the shunt, but the shunt produces great active power loss when the heavy current of flowing through, not only influences the measurement, need consider the heat dissipation problem moreover.
(3) The current electromagnetic current transformer has the problem of magnetic saturation, and can cause large errors of electric energy metering due to direct current magnetic biasing, thereby bringing economic loss.
The difficulty in solving the above problems and defects is:
the methods for compensating current transformer saturation proposed by researchers at home and abroad are mainly divided into a software method and a hardware method. The software method generally uses various algorithms to extract information in the original current or start and stop time of current transformer saturation so as to restore the secondary current, but the software method cannot completely and accurately restore the secondary current, and a device for detecting transformer saturation is very complex and is not suitable for electric energy measurement. The hardware method usually uses auxiliary transformers, power electronic switching devices, large inductors and other devices to compensate the saturation of the current transformer, but the proposed hardware devices have large volume, need complex control devices and algorithms, and cannot be applied to electric energy metering.
The significance of solving the problems and the defects is as follows:
the accuracy and the rationality of the electric energy metering data directly influence the economic benefits of three parties of sending, supplying and using electricity and the fairness of transactions. In addition, the electric energy measurement is also directly related to the calculation of various technical indexes of the electric power system such as generated energy, line loss, coal consumption, station service power, power supply quantity, power consumption and the like. Therefore, accurate metering of electric energy is an important issue in electric power systems involving many problems such as economy and technology.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides an electric energy metering device based on sampling of magnetic valve formula current transformer.
The utility model discloses a realize like this, an electric energy metering device based on sampling of magnetic valve formula current transformer is provided with:
the device comprises a magnetic valve type current transformer, a voltage sampling device, a metering chip and an energy taking device;
the output end of the magnetic valve type current transformer and the output end of the voltage sampling device are respectively connected with the metering chip;
the outer end of the energy taking device is connected with a mains supply, and the other end of the energy taking device is connected with the magnetic valve type current transformer, the voltage sampling device and the metering chip respectively.
Further, the magnetic valve type current transformer comprises a primary winding, a secondary load, a main iron core, a magnetic field sensor and a signal processing device;
the main iron core is provided with a magnetic valve structure, the magnetic field sensor is placed in the main iron core, and an output signal and a secondary load of the magnetic field sensor are connected with the signal processing device through a connecting circuit.
Further, the magnetic valve structure is provided with an air gap arranged on the upper side of the iron core of the magnetic valve section, and the magnetic field sensor is placed in the air gap.
Further, the signal processing device comprises an amplifier, an adder and a DC offset removing circuit.
Combine foretell all technical scheme, the utility model discloses the advantage and the positive effect that possess do:
the utility model can not only carry out the alternating current electric energy measurement, but also carry out the direct current electric energy measurement, and can greatly improve the frequency range and the accuracy of the electric energy measurement; the current transformer saturation caused by direct current magnetic biasing or inter-harmonic and sub-harmonic can be compensated, and therefore economic loss caused by the current transformer saturation is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a magnetic valve type current transformer according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a magnetic valve structure according to an embodiment of the present invention.
Fig. 3 is a circuit connection circuit diagram of a signal processing apparatus according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a field test circuit provided by an embodiment of the present invention.
Fig. 5 is a schematic diagram of a metering process provided by an embodiment of the present invention.
In the figure: 1. a primary winding; 2. a main iron core; 3. a magnetic valve arrangement; 4. a magnetic field sensor; 5. a secondary winding; 6. carrying out secondary loading; 7. a signal processing device; 8. a magnetic valve section iron core; 9. an air gap.
Fig. 6 is a PCB real object of the signal processing device provided by the embodiment of the present invention.
Fig. 7 is a schematic diagram of a modification provided by an embodiment of the present invention.
Fig. 8 is an experimental circuit diagram provided by the embodiment of the present invention.
Fig. 9 is a field experiment diagram provided by the embodiment of the present invention.
Fig. 10 is a graph comparing output signals when the primary current is a sinusoidal current.
Fig. 11 is a comparison graph of output signals when the primary current provided by the embodiment of the present invention is a sinusoidal half-wave current.
Fig. 12 shows the measurement result when the primary current provided by the embodiment of the present invention is a sinusoidal current.
Fig. 13 is a measurement result when the primary current provided by the embodiment of the present invention is a sinusoidal half-wave current.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Problem to prior art existence, the utility model provides an electric energy metering device based on sampling of magnetic valve formula current transformer, it is right to combine the attached drawing below the utility model discloses do detailed description.
As shown in fig. 1 to 5, an electric energy metering device based on sampling by a magnetic valve type current transformer provided by an embodiment of the present invention includes a magnetic valve type current transformer, a voltage sampling device, a metering chip and an energy obtaining device; the output end of the magnetic valve type current transformer and the output end of the voltage sampling device are respectively connected with the metering chip; the outer end of the energy taking device is connected with a mains supply, and the other end of the energy taking device is respectively connected with the magnetic valve type current transformer, the voltage sampling device and the metering chip.
The magnetic valve type current transformer in the embodiment of the utility model comprises a primary winding 1, a secondary winding 5, a secondary load 6, a main iron core 2, a magnetic field sensor 4 and a signal processing device 7;
the main iron core 2 is provided with a magnetic valve structure 3, the magnetic valve structure 3 is provided with a magnetic valve iron core 8 and an air gap 9, the magnetic field sensor 4 is placed in the air gap 9, and an output signal of the magnetic field sensor 4 and the secondary load 6 are connected with the signal processing device 7 through a connecting circuit.
The signal processing device 7 in the embodiment of the present invention includes an amplifier, an adder, and a dc offset removing circuit.
The utility model discloses a theory of operation is: a current sampling module used in the electric energy meter is set as a magnetic valve type current transformer, and the total output end of the magnetic valve type current transformer is connected to the current signal input end of the electric energy meter. And adjusting various parameters of the magnetic valve type current transformer signal processing device. The signal processing device, the magnetic field sensor and the metering chip are powered through the energy obtaining circuit. The electric energy meter is connected into the circuit, and the digital display screen can display the corresponding electric energy metering result after the circuit is powered on.
In the present embodiment, the above electric energy metering device includes but is not limited to: the device comprises a magnetic valve type current transformer, a magnetic field sensor, a signal processing device, a voltage transformer, a metering chip, a digital display screen and an energy taking circuit.
The present invention is further described below in conjunction with the following detailed description:
as shown in fig. 7, a current sampling module (electromagnetic current transformer) in a conventional electric meter is replaced by a magnetic valve type current transformer, and an output end of a signal processing device of the magnetic valve type current transformer is connected to a current signal input end of an original electric meter. The electric energy metering experiment shown in fig. 9 was performed in accordance with the circuit diagram shown in fig. 8. The experimental waveforms are shown in fig. 10 and 11, and the experimental data are shown in fig. 12 and 13. According to the experimental result, when the line current is sinusoidal current, the traditional ammeter keeps consistent with the metering result of the utility model; when line current contains the direct current magnetic biasing current, the electromagnetic type current transformer output signal that traditional ammeter used seriously distorts, and the serious distortion of traditional ammeter measurement result, nevertheless the utility model discloses a current signal waveform still keeps sinusoidal half-wave waveform well, and the measurement result accords with the actual result, does not take place the measurement distortion.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the specific implementation of the present invention, but the protection scope of the present invention is not limited thereto, and any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention should be covered by the protection scope of the present invention.
Claims (3)
1. The utility model provides an electric energy metering device based on sampling of magnetic valve formula current transformer which characterized in that, electric energy metering device based on sampling of magnetic valve formula current transformer is provided with:
the device comprises a magnetic valve type current transformer, a voltage sampling device, a metering chip and an energy taking device;
the output end of the magnetic valve type current transformer and the output end of the voltage sampling device are respectively connected with the metering chip;
the outer end of the energy taking device is connected with a mains supply, and the other end of the energy taking device is connected with the magnetic valve type current transformer, the voltage sampling device and the metering chip respectively.
2. The magnetic valve type current transformer sampling based electric energy metering device according to claim 1, wherein the magnetic valve type current transformer comprises a primary winding, a secondary load, a main iron core, a magnetic field sensor and a signal processing device;
the main iron core is provided with a magnetic valve structure, the magnetic valve structure comprises a magnetic valve iron core and an air gap, the magnetic field sensor is placed in the air gap, and an output signal of the magnetic field sensor and a secondary load are connected with the signal processing device through a connecting circuit.
3. A magnetic valve current transformer sampling based power metering device as claimed in claim 2 wherein the signal processing means comprises an amplifier, an adder and a dc offset removal circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122831900.9U CN217238204U (en) | 2021-11-18 | 2021-11-18 | Electric energy metering device based on magnetic valve type current transformer sampling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122831900.9U CN217238204U (en) | 2021-11-18 | 2021-11-18 | Electric energy metering device based on magnetic valve type current transformer sampling |
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| Publication Number | Publication Date |
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| CN217238204U true CN217238204U (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122831900.9U Active CN217238204U (en) | 2021-11-18 | 2021-11-18 | Electric energy metering device based on magnetic valve type current transformer sampling |
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| Country | Link |
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| CN (1) | CN217238204U (en) |
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- 2021-11-18 CN CN202122831900.9U patent/CN217238204U/en active Active
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