CN215953839U - Error measurement system of bipolar direct access type direct current electric energy meter - Google Patents
Error measurement system of bipolar direct access type direct current electric energy meter Download PDFInfo
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Abstract
The utility model discloses an error measuring system of a bipolar direct access type direct current electric energy meter, which comprises: the standard signal output module is used for enabling the direct current voltage standard source and the direct current standard source to output standard voltage signals and standard current signals to the direct current electric energy meter to be tested; the electric energy pulse input and output module is used for acquiring pulse data and electric energy pulse data output by the direct current electric energy meter to be tested; the sampling data acquisition module is used for acquiring the standard voltage signal and the standard current signal so as to acquire voltage sampling data and current sampling data; the data processing module is used for calculating an electric energy standard value according to the voltage sampling data and the current sampling data; calculating the electric energy measurement value of the direct current electric energy meter to be measured according to the electric energy pulse data; calculating the electric energy metering error of the direct current electric energy meter to be measured according to the electric energy standard value and the electric energy measured value; and the storage module is used for storing the electric energy metering error of the direct current electric energy meter to be tested.
Description
Technical Field
The utility model relates to the technical field of electric energy metering, in particular to an error measuring system of a bipolar direct-access direct-current electric energy meter.
Background
With the rapid development of economic society and technical equipment, new energy elements such as distributed generation, energy storage and electric vehicles are increasingly connected into a power distribution network, a novel source-network-load-storage interaction energy supply mode is continuously developed, flexible direct current power distribution, alternating current and direct current hybrid power distribution and the like become important development directions of the future power distribution network, and are complementary with the traditional alternating current power distribution to realize interconnection and intercommunication of alternating current and direct current power grids. The rapid development of the direct-current power distribution network creates more application environments for direct-current electric energy metering. The direct current distribution network has a bipolar connection mode, each pole (anode and cathode) can independently operate, and the anode current and the cathode current can be unequal, the double-stage direct access type direct current electric energy meter can be installed on a bipolar power grid line, 2 paths of voltage and 2 paths of current are respectively input, and the electric energy and the total electric energy on 2 power transmission lines are respectively measured.
The existing direct current electric energy meter detection method and system are directed to an electric energy meter applied to a single-stage power grid line, the electric energy meter only inputs 1-path voltage and current (or small voltage converted by a front-end current divider from the current) to calculate electric energy and only needs to calculate one total electric energy, the double-pole direct access type direct current electric energy meter can simultaneously calculate the electric energy of a positive power grid line, the double-path electric energy of a negative power grid line and the total electric energy, and when the power grid operates in a single-stage mode, the electric energy meter only measures the electric energy on the single-stage power grid line, so that the single-stage electric energy metering error and the total electric energy metering error of the electric energy meter are required to be respectively detected or calibrated.
Currently, an error measurement system of the electric energy meter is not available.
Disclosure of Invention
The utility model provides an error measuring system of a bipolar direct-access direct-current electric energy meter, which aims to solve the problem of how to detect the metering error of the bipolar direct-access direct-current electric energy meter.
In order to solve the above problem, according to an aspect of the present invention, there is provided an error measurement system of a bipolar direct-access direct-current electric energy meter, the system including:
the standard signal output module is used for enabling the direct current voltage standard source and the direct current standard source to respectively output a standard voltage signal and a standard current signal to the direct current electric energy meter to be detected according to a preset detection mode;
the electric energy pulse input and output module is used for acquiring pulse data and electric energy pulse data output by the to-be-tested direct current electric energy meter after sampling and metering the standard voltage signal and the standard current signal;
the sampling data acquisition module is used for acquiring the standard voltage signal and the standard current signal so as to acquire voltage sampling data and current sampling data;
the data processing module is used for calculating an electric energy standard value according to the voltage sampling data and the current sampling data; calculating the electric energy measurement value of the direct current electric energy meter to be measured according to the electric energy pulse data; calculating the electric energy metering error of the direct current electric energy meter to be measured according to the electric energy standard value and the electric energy measured value;
and the storage module is used for storing the electric energy metering error of the direct current electric energy meter to be tested.
Preferably, in the standard signal output module, the dc voltage standard source is a dual-path independent dc voltage standard source, and the dc current standard source is a dual-path independent dc current standard source;
the detection mode includes: a positive detection mode, a negative detection mode and a bipolar detection mode; wherein the content of the first and second substances,
when the detection mode is a positive detection mode, the standard voltage signal is a positive voltage signal, and the standard current signal is a positive current signal;
when the detection mode is a negative detection mode, the standard voltage signal is a negative voltage signal, and the standard current signal is a negative current signal;
when the detection mode is a bipolar detection mode, the standard voltage signals are positive voltage signals and negative voltage signals, and the standard current signals are positive current signals and negative current signals.
Preferably, the sampling data acquiring module acquires the standard voltage signal and the standard current signal to acquire voltage sampling data and current sampling data, and includes:
sequentially performing signal conditioning, voltage/voltage conversion and analog-to-digital conversion on the standard voltage signal to acquire the voltage sampling data;
and sequentially carrying out signal conditioning, current/voltage conversion and analog-to-digital conversion on the standard current signal so as to obtain the current sampling data.
Preferably, the data processing module calculates an electric energy metering error of the dc electric energy meter to be measured according to the electric energy standard value and the electric energy measured value, and includes:
δ＝(EX-EN)/EN*100％，
wherein E isXIs a measured value of the electric energy; when the detection mode is a positive detection mode, delta is the positive electric energy metering error of the direct current electric energy meter to be detected, ENThe electric energy standard value of the anode is obtained; when the detection mode is a negative electrode detection mode, delta is the negative electrode electric energy metering error of the direct current electric energy meter to be detected, ENThe standard value of the electric energy of the cathode; when the detection mode is a bipolar detection mode, delta is a bipolar electric energy metering error of the direct current electric energy meter to be detected, ENIs the sum of the electric energy standard value of the anode and the electric energy standard value of the cathode.
Preferably, wherein the system further comprises:
and the communication module is used for carrying out data interaction with an upper computer or storage equipment.
Preferably, wherein the system further comprises:
and the constant-temperature crystal oscillator module is used for providing time scales for the electric energy pulse input/output module.
Preferably, wherein the system further comprises:
and the power supply module is used for providing power supply support for the system.
Preferably, wherein the system further comprises:
and the display module is used for displaying the parameters and the measurement results and providing a human-computer interaction interface.
Preferably, wherein the system further comprises:
and the auxiliary power supply module is used for providing a direct current power supply for the direct current electric energy meter to be tested with the auxiliary power supply.
The utility model provides an error measurement system of a bipolar direct access type direct current electric energy meter, which respectively outputs a standard voltage signal and a standard current signal to the direct current electric energy meter to be measured according to a preset detection mode through a direct current voltage standard source and a direct current standard source, calculates the electric energy measurement errors of a positive pole, a negative pole and a bipolar pole of the direct current electric energy meter to be measured according to the electric energy standard value and the electric energy measured value obtained by measurement, and realizes the accurate measurement of the measurement errors of the bipolar direct access type direct current electric energy meter under the condition of single-pole input or bipolar input.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic structural diagram of an error measurement system 100 of a bipolar direct-access direct-current electric energy meter according to an embodiment of the present invention;
fig. 2 is an error measurement schematic diagram of a bipolar direct-access direct-current electric energy meter according to an embodiment of the utility model;
fig. 3 is a measurement schematic diagram of an error measurement system of a bipolar direct-access direct-current electric energy meter according to an embodiment of the utility model;
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the utility model. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic structural diagram of an error measurement system 100 of a bipolar direct-access direct-current electric energy meter according to an embodiment of the present invention. As shown in fig. 1, in the error measurement system of the bipolar direct-access dc electric energy meter according to the embodiment of the present invention, the dc voltage standard source and the dc current standard source respectively output the standard voltage signal and the standard current signal to the dc electric energy meter to be measured according to the preset detection mode, and the electric energy measurement errors of the anode, the cathode, and the bipolar of the dc electric energy meter to be measured are calculated according to the electric energy standard value and the electric energy measurement value obtained by measurement, so that the accurate measurement of the measurement error of the bipolar direct-access dc electric energy meter under the condition of single-stage input or bipolar input is realized. The error measurement system 100 of the bipolar direct access type dc electric energy meter according to the embodiment of the present invention includes: the device comprises a standard signal output module 101, an electric energy pulse input and output module 102, a sampling data acquisition module 103, a data processing module 104 and a storage module 105.
Preferably, the standard signal output module 101 is configured to enable the dc voltage standard source and the dc current standard source to output a standard voltage signal and a standard current signal to the dc electric energy meter to be tested according to a preset detection mode.
Preferably, in the standard signal output module 101, the dc voltage standard source is a dual-path independent dc voltage standard source, and the dc current standard source is a dual-path independent dc current standard source;
the detection mode includes: a positive detection mode, a negative detection mode and a bipolar detection mode; wherein the content of the first and second substances,
when the detection mode is a positive detection mode, the standard voltage signal is a positive voltage signal, and the standard current signal is a positive current signal;
when the detection mode is a negative detection mode, the standard voltage signal is a negative voltage signal, and the standard current signal is a negative current signal;
when the detection mode is a bipolar detection mode, the standard voltage signals are positive voltage signals and negative voltage signals, and the standard current signals are positive current signals and negative current signals.
Preferably, wherein the system further comprises:
and the signal isolation module is used for isolating the voltage signals and/or the current signals of different paths by utilizing a magnetic isolation technology.
Fig. 2 is an error measurement schematic diagram for implementing a bipolar direct-access direct-current electric energy meter according to an embodiment of the utility model. As shown in fig. 2, the port of the bipolar direct-access direct-current electric energy meter detection system includes: positive voltage output interface U +, U0Negative voltage output interface U-, U0Respectively connected with positive and negative voltage input terminals U +, U-and PE terminals of the electric energy meter, wherein U is connected with the positive and negative voltage input terminals U +, U-and PE terminals0The direct current electric energy meter is connected with the PE, and can output 2 paths of independent standard voltage signals to the direct current electric energy meter to be tested; further comprising: positive electrode current output interface I +, I0+, negative current output interface I-, I0Respectively connected to the positive and negative current input terminals I +, I of the electric energy meter0+ and I-, I0The terminals are connected and can output 2 paths of independent standard current signals to the direct current electric energy meter to be tested; the pulse input port of the detection system is connected with the pulse output port of the DC electric energy meter to be detected, and the DC electric energy meter to be detected is used for sampling voltage and currentAnd calculating electric energy and outputting electric energy pulses, and inputting the electric energy pulses to the detection system through a pulse input port of the detection system. The detection system can calculate an electric energy standard value, can calculate an electric energy measurement error of the direct current electric energy meter to be detected according to the electric energy pulse of the direct current electric energy meter to be detected, and then calculates an electric energy metering error of the direct current electric energy meter to be detected according to the electric energy standard value and the electric energy measurement value.
Referring to fig. 3, in the present invention, a bipolar direct-access type dc power meter detection system outputs 2 independent voltage signals and 2 independent current signals according to set parameters, and respectively accesses a positive voltage input terminal, a negative voltage input terminal, a positive current input terminal and a negative current input terminal of a dc power meter to be detected, the dc power meter performs voltage and current sampling to calculate power and output power pulses, the detection system calculates a standard power value, a pulse input port of the detection system is connected to a pulse output port of the dc power meter to be detected, to obtain pulses of the dc power meter to be detected, calculates a measured power value, and calculates a power metering error of the dc power meter to be detected according to the measured power value and the standard power value.
The bipolar direct access type direct current electric energy meter detection system comprises a main control unit, 2 independent direct current voltage standard sources and 2 independent direct current standard sources, wherein the main control unit comprises: the device comprises a sampling data acquisition module, a data processing module, a display module, a communication module, a constant temperature crystal oscillator module, an electric energy pulse input/output module and a power supply module.
In the utility model, the direct current voltage standard source and the direct current standard source respectively output a standard voltage signal and a standard current signal to the direct current electric energy meter to be detected according to a preset detection mode. The direct-current voltage standard source can provide high-precision and stable direct-current voltage for a voltage loop of the detected electric energy meter, wherein one direct-current voltage standard source is positive voltage U1, and the other direct-current voltage standard source is negative voltage U2; each path of signal is isolated by adopting a magnetic isolation technology, and each path of D/A signal does not interfere with each other. The direct current standard source can provide high-precision and stable direct current for a current loop of the detected electric energy meter, wherein one path is positive current I1, and the other path is negative current I2; each path of signal is isolated by adopting a magnetic isolation technology, and each path of D/A signal does not interfere with each other.
In the utility model, the main control unit provides a parameter setting man-machine interface, can control the voltage and the current source through the man-machine interface to output an analog voltage signal and an analog current signal according to a set detection mode, and calculates an electric energy standard value and an error. The set parameters comprise a pulse constant, a rated voltage, a rated current, a maximum current and a voltage and current test point of the tested electric energy meter.
In the main control unit, only an anode standard voltage signal and an anode standard current signal can be output so as to realize the detection of the anode electric energy metering error of the detected meter; the device can only output a negative standard voltage signal and a negative standard current signal so as to realize the detection of the negative electric energy metering error of the detected meter; the device can simultaneously output anode and cathode standard voltage signals and equal and unequal anode and cathode standard current signals so as to realize the detection of the bipolar total electric energy metering error of the detected electric energy meter. When the detection mode is a positive detection mode, the standard voltage signal is a positive voltage signal, and the standard current signal is a positive current signal; when the detection mode is a negative detection mode, the standard voltage signal is a negative voltage signal, and the standard current signal is a negative current signal; when the detection mode is a bipolar detection mode, the standard voltage signals are positive voltage signals and negative voltage signals, and the standard current signals are positive current signals and negative current signals.
Preferably, the electric energy pulse input/output module 102 is configured to obtain pulse data electric energy pulse data output by the to-be-tested dc electric energy meter after sampling and measuring the standard voltage signal and the standard current signal.
In the utility model, the direct current electric energy meter to be tested can output pulses to a detection system according to an input standard voltage signal and a standard current signal, and the detection system calculates the electric energy measured value of the direct current electric energy meter to be tested according to pulse data, and the method comprises the following steps: and Ex is the measured value of the electric energy of the detected electric energy meter, N is the pulse number of the collected detected electric energy meter, and C is the pulse constant of the detected electric energy meter.
Preferably, the sampling data acquiring module 103 is configured to acquire the standard voltage signal and the standard current signal to acquire voltage sampling data and current sampling data.
Preferably, the sampling data acquiring module 103 acquires the standard voltage signal and the standard current signal to acquire voltage sampling data and current sampling data, and includes:
sequentially performing signal conditioning, voltage/voltage conversion and analog-to-digital conversion on the standard voltage signal to acquire the voltage sampling data;
and sequentially carrying out signal conditioning, current/voltage conversion and analog-to-digital conversion on the standard current signal so as to obtain the current sampling data.
Preferably, the data processing module 104 is configured to calculate an electric energy standard value according to the voltage sampling data and the current sampling data; calculating the electric energy measurement value of the direct current electric energy meter to be measured according to the electric energy pulse data; and calculating the electric energy metering error of the direct current electric energy meter to be measured according to the electric energy standard value and the electric energy measured value.
Preferably, the data processing module 104 calculates an electric energy metering error of the dc electric energy meter to be measured according to the electric energy standard value and the electric energy measured value, and includes:
δ＝(EX-EN)/EN*100％，
wherein E isXIs a measured value of the electric energy; when the detection mode is a positive detection mode, delta is the positive electric energy metering error of the direct current electric energy meter to be detected, ENThe electric energy standard value of the anode is obtained; when the detection mode is a negative electrode detection mode, delta is the negative electrode electric energy metering error of the direct current electric energy meter to be detected, ENThe standard value of the electric energy of the cathode; when the detection mode is a bipolar detection mode, delta is a bipolar electric energy metering error of the direct current electric energy meter to be detected, ENIs the sum of the electric energy standard value of the anode and the electric energy standard value of the cathode.
In the utility model, a detection system utilizes a sampling data acquisition module to recover voltage and current signals output by a standard source, converts a large voltage signal into a small voltage signal through signal conditioning and V/V conversion in sequence, inputs the small voltage signal into an A/D (analog/digital) conversion mode to convert the small voltage signal into a voltage sampling value digital signal, acquires voltage sampling data and outputs the voltage sampling data to a data processing module; and converting a large current signal into a small voltage signal through signal conditioning and I/V conversion, inputting the small voltage signal into an A/D (analog/digital) converter to convert the small voltage signal into a current sampling value digital signal, acquiring current sampling data, and outputting the current sampling data to a data processing module.
In the utility model, a data processing module is used for calculating the electric energy standard value according to the voltage sampling data and the current sampling data. When the detection mode is the positive detection mode, the data processing module calculates the positive electric energy E through the collected positive voltage U1 and the positive current I1N1Namely the standard value of the electric energy. When the detection mode is a negative electrode detection mode, collecting negative electrode voltage U2 and negative electrode current I2, and calculating negative electrode electric energy EN2I.e. the standard value of the electrical energy. When the detection mode is a bipolar detection mode, the standard value of the electric energy is EN＝EN1+EN2. In the present invention, the data processing module uses the formula δ ═ (E)X-EN)/ENAnd 100%, calculating the electric energy metering error of the direct current electric energy meter to be measured according to the electric energy standard value and the electric energy measured value. Wherein E isXIs a measured value of the electric energy; when the detection mode is a positive detection mode, delta is the positive electric energy metering error of the direct current electric energy meter to be detected, ENThe electric energy standard value of the anode is obtained; when the detection mode is a negative electrode detection mode, delta is the negative electrode electric energy metering error of the direct current electric energy meter to be detected, ENThe standard value of the electric energy of the cathode; when the detection mode is a bipolar detection mode, delta is a bipolar electric energy metering error of the direct current electric energy meter to be detected, ENIs the sum of the electric energy standard value of the anode and the electric energy standard value of the cathode.
Preferably, the storage module 105 is configured to store an electric energy metering error of the dc electric energy meter to be tested.
Preferably, wherein the system further comprises:
and the signal isolation module is used for isolating the voltage signals and/or the current signals of different paths by utilizing a magnetic isolation technology.
Preferably, wherein the system further comprises:
and the communication module is used for carrying out data interaction with an upper computer or storage equipment.
Preferably, wherein the system further comprises:
and the constant-temperature crystal oscillator module is used for providing time scales for the electric energy pulse input/output module.
Preferably, wherein the system further comprises:
and the power supply module is used for providing power supply support for the system.
Preferably, wherein the system further comprises:
and the display module is used for displaying the parameters and the measurement results and providing a human-computer interaction interface.
Preferably, wherein the system further comprises:
and the auxiliary power supply module is used for providing a direct current power supply for the direct current electric energy meter to be tested with the auxiliary power supply.
In addition, the system can also provide time scales for the electric energy pulse input/output module through the constant-temperature crystal oscillator module; communication and data interaction between the communication module and an upper computer or storage equipment are realized, and a parameter setting man-machine interface is provided; a power supply module is used for supplying power to the system; displaying the parameters and the detection result by using a display module; and a touch screen parameter setting man-machine interface can be provided. The auxiliary power supply can provide power supply of DC 5V-36V for the tested electric energy meter with the auxiliary power supply.
The error measuring system of the bipolar direct access type direct current electric energy meter can respectively set and output 2 paths of independent current voltage to the electric energy meter to be detected, the voltage and the current of each path can be independently adjusted, the total electric energy is calculated, and the accurate measurement of the metering error of the electric energy meter under the condition of single-stage input or bipolar input is realized.
The utility model has been described with reference to a few embodiments. However, other embodiments of the utility model than the one disclosed above are equally possible within the scope of the utility model, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.
Claims (9)
1. An error measurement system for a bipolar direct-access direct-current electric energy meter, the system comprising:
the standard signal output module is used for enabling the direct current voltage standard source and the direct current standard source to respectively output a standard voltage signal and a standard current signal to the direct current electric energy meter to be detected according to a preset detection mode;
the electric energy pulse input and output module is used for acquiring pulse data and electric energy pulse data output by the to-be-tested direct current electric energy meter after sampling and metering the standard voltage signal and the standard current signal;
the sampling data acquisition module is used for acquiring the standard voltage signal and the standard current signal so as to acquire voltage sampling data and current sampling data;
the data processing module is used for calculating an electric energy standard value according to the voltage sampling data and the current sampling data; calculating the electric energy measurement value of the direct current electric energy meter to be measured according to the electric energy pulse data; calculating the electric energy metering error of the direct current electric energy meter to be measured according to the electric energy standard value and the electric energy measured value;
and the storage module is used for storing the electric energy metering error of the direct current electric energy meter to be tested.
2. The system of claim 1, wherein at the standard signal output module, the dc voltage standard source is a dual independent dc voltage standard source, and the dc current standard source is a dual independent dc current standard source;
the detection mode includes: a positive detection mode, a negative detection mode and a bipolar detection mode; wherein the content of the first and second substances,
when the detection mode is a positive detection mode, the standard voltage signal is a positive voltage signal, and the standard current signal is a positive current signal;
when the detection mode is a negative detection mode, the standard voltage signal is a negative voltage signal, and the standard current signal is a negative current signal;
when the detection mode is a bipolar detection mode, the standard voltage signals are positive voltage signals and negative voltage signals, and the standard current signals are positive current signals and negative current signals.
3. The system of claim 1, wherein the sample data acquisition module acquires the standard voltage signal and the standard current signal to acquire voltage sample data and current sample data, and comprises:
sequentially performing signal conditioning, voltage/voltage conversion and analog-to-digital conversion on the standard voltage signal to acquire the voltage sampling data;
and sequentially carrying out signal conditioning, current/voltage conversion and analog-to-digital conversion on the standard current signal so as to obtain the current sampling data.
4. The system of claim 1, wherein the data processing module calculates the electric energy metering error of the dc electric energy meter to be measured according to the electric energy standard value and the electric energy measured value, and comprises:
δ＝(EX-EN)/EN*100％，
wherein E isXIs a measured value of the electric energy; when the detection mode is a positive detection mode, delta is the positive electric energy metering error of the direct current electric energy meter to be detected, ENThe electric energy standard value of the anode is obtained; when the detection mode is a negative electrode detection mode, delta is the negative electrode electric energy metering error of the direct current electric energy meter to be detected, ENThe standard value of the electric energy of the cathode; when the detection mode is a bipolar detection mode, delta is a bipolar electric energy metering error of the direct current electric energy meter to be detected, ENIs the sum of the electric energy standard value of the anode and the electric energy standard value of the cathode.
5. The system of claim 1, further comprising:
and the communication module is used for carrying out data interaction with an upper computer or storage equipment.
6. The system of claim 1, further comprising:
and the constant-temperature crystal oscillator module is used for providing time scales for the electric energy pulse input/output module.
7. The system of claim 1, further comprising:
and the power supply module is used for providing power supply support for the system.
8. The system of claim 1, further comprising:
and the display module is used for displaying the parameters and the measurement results and providing a human-computer interaction interface.
9. The system of claim 1, further comprising:
and the auxiliary power supply module is used for providing a direct current power supply for the direct current electric energy meter to be tested with the auxiliary power supply.
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