CN211928157U - Direct access type direct current electric energy meter calibrating device - Google Patents
Direct access type direct current electric energy meter calibrating device Download PDFInfo
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- CN211928157U CN211928157U CN202020534115.XU CN202020534115U CN211928157U CN 211928157 U CN211928157 U CN 211928157U CN 202020534115 U CN202020534115 U CN 202020534115U CN 211928157 U CN211928157 U CN 211928157U
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Abstract
The utility model discloses a direct access type direct current electric energy meter calibrating device, which comprises an upper computer, a microprocessor, an FPGA, a voltage calibrating loop, a current calibrating loop, a conversion module, a temperature compensation time scale module and an error calculation module, wherein the upper computer is connected with the microprocessor, the voltage calibrating loop and the current calibrating loop are respectively connected with a voltage terminal and a current terminal of a tested electric energy meter, the FPGA is respectively connected with the microprocessor, the voltage calibrating loop and the current calibrating loop, one output end of the FPGA is connected with the temperature compensation time scale module, one input end of the FPGA is connected with the error calculation module, the other input end of the FPGA is connected with a clock module, the clock module is respectively connected with the voltage calibrating loop and the current calibrating loop, the error calculation module is respectively connected with a standard clock reference module, a daily timing pulse module and the tested electric energy pulse module, the daily timing pulse module and the tested electric energy pulse module are both connected with a, the method has the advantages of accurate verification and higher verification efficiency.
Description
Technical Field
The utility model relates to an electric energy examination technical field especially relates to a direct access formula direct current electric energy meter calibrating installation.
Background
The direct current electric energy meter has wide application fields, such as direct current charging and battery replacement of an electric automobile, photovoltaic power generation, a communication base station and a direct current traction system. Based on the fairness and fairness of the metering, in the direct current electricity utilization fields, direct current metering is inevitably selected, the verification work of the electric energy meter is to ensure the accuracy of an electric energy metering device, and the market potential of the direct current electric energy meter rapid verification device is huge along with the rapid development of electric vehicles and new energy power generation.
Therefore, how to develop a direct access type direct current electric energy meter calibrating device with accurate calibration and high calibration efficiency becomes a problem which needs to be solved urgently by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a direct access formula direct current electric energy meter calibrating installation has solved above-mentioned technical problem.
On one hand, the utility model provides a direct access type direct current electric energy meter calibrating installation, including host computer, microprocessor, FPGA, voltage verification return circuit, electric current verification return circuit, transform module, temperature compensation time scale module and error calculation module, the host computer links to each other with microprocessor, voltage verification return circuit is connected with the voltage terminal of the electric energy meter under test, electric current verification return circuit is connected with the electric current terminal of the electric energy meter under test, voltage verification return circuit and electric current verification return circuit set up in parallel, FPGA is connected with microprocessor, voltage verification return circuit, electric current verification return circuit respectively, carries out the two-way transmission of data, and an output of FPGA is connected with temperature compensation time scale module, and its one input is connected with the output of error calculation module, and its another input is connected with the clock module, the clock module links to each other with voltage verification return circuit and electric current verification return circuit respectively, the input end of the error calculation module is respectively connected with the output end of the standard clock reference module, the output end of the daily timing pulse module and the output end of the detected electric energy pulse module, and the input end of the daily timing pulse module and the input end of the detected electric energy pulse module are both connected with the pulse output end of the detected electric energy meter.
Further, voltage verification return circuit includes voltage regulation type constant voltage unit, direct current voltage amplifier, direct current voltage output terminal, voltage sampling module, AD converter and DA converter, an input and the FPGA of voltage regulation type constant voltage unit are connected, and its output series connection direct current voltage amplifier, direct current voltage output terminal, voltage sampling module and AD converter in proper order, the output of AD converter is connected to FPGA, the input and the FPGA of DA converter are connected, and the output of its output and voltage sampling module is connected to another input of voltage regulation type constant voltage unit behind the parallelly connected voltage regulation signal module of voltage regulation type, direct current voltage output terminal is connected with the voltage terminal of the electric energy meter of being examined.
Furthermore, the current verification loop comprises a voltage regulation type constant current unit, a D/A converter, a direct current output terminal, a broadband direct current comparator and an A/D converter, wherein one input end of the voltage regulation type constant current unit is connected with the FPGA, the output end of the voltage regulation type constant current unit is sequentially connected with the direct current output terminal, the broadband direct current comparator and the A/D converter in series, the output end of the A/D converter is connected to the FPGA, the input end of the D/A converter is connected with the FPGA, the output end of the D/A converter and the output end of the broadband direct current comparator are connected with the current regulation signal module in parallel and then are connected with the other input end of the voltage regulation type constant current unit, and the direct current output terminal is connected with a current terminal of the to.
Furthermore, the direct access type direct current electric energy meter calibrating device further comprises an abnormity alarm module, and the abnormity alarm module is connected with the other input end of the FPGA.
Further, the direct access type direct current electric energy meter calibrating device further comprises an operation table display interface, an EEPROM, various communication interfaces and an error display screen which are respectively connected with the microprocessor, and the microprocessor performs bidirectional data transmission with the operation table display interface, the EEPROM, the various communication interfaces and the error display screen.
Further, the maximum output voltage of the dc voltage output terminal is not higher than 1150V.
Further, the maximum output current of the direct current output terminal is not higher than 100A.
The utility model discloses a calibrating installation generates direct current voltage output signal through the voltage verification return circuit, and input this direct current voltage output signal to the voltage terminal of the electric energy meter examined, generate direct current output signal through the electric current verification return circuit, and input this direct current output signal to the current terminal of the electric energy meter examined, the electric energy meter examined outputs pulse signal, obtain the pulse signal of examining the electric energy meter in real time through examining the electric energy pulse module, count the quantity of the pulse signal of examining the pulse output end output of electric energy meter through the daily timing pulse module, again by the error calculation module according to the standard pulse constant of storing in advance and from the pulse signal and the pulse signal quantity of examining the electric energy meter output, carry out the pulse comparison and obtain the pulse error result, feed back this pulse error result and the pulse signal of examining the electric energy meter output to microprocessor and convert into electric energy error value and real-time value and send to the host computer, meanwhile, standard time can be provided for the error calculation module through the standard clock reference module, the time error of the electric energy meter to be detected is calculated by the standard time and the actual time of the electric energy meter to be detected for sending the pulse signal, and the method has the advantages of accuracy in detection and high detection efficiency.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a schematic block diagram of a direct access type dc electric energy meter calibrating apparatus provided by an embodiment of the present invention.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 is a schematic block diagram of a direct access type dc electric energy meter calibrating apparatus according to an embodiment of the present invention. Referring to fig. 1, a direct access type dc electric energy meter calibrating apparatus includes an upper computer, a microprocessor, an FPGA (Field Programmable gate array), a voltage calibrating circuit, a current calibrating circuit, a transforming module, a temperature compensation time scale module, and an error calculating module, where the microprocessor may be a 32-bit or 64-bit microprocessor, and is powered by a power module, where:
the upper computer is connected with the microprocessor;
the voltage verification circuit is connected with a voltage terminal of the electric energy meter to be detected, the voltage verification circuit is used for generating a large-voltage output signal of the electric energy meter to be detected and inputting the large-voltage output signal to the voltage terminal of the direct-energy ammeter to be detected, and the electric energy meter to be detected is powered by the auxiliary power supply module;
the current verification loop is connected with a current terminal of the detected electric energy meter and is used for generating a current output signal of the detected electric energy meter and inputting the current output signal to the current terminal of the detected direct-energy ammeter;
the voltage verification loop and the current verification loop are arranged in parallel;
the FPGA is respectively connected with the microprocessor, the voltage verification loop and the current verification loop to carry out bidirectional data transmission, one output end of the FPGA is connected with the temperature compensation time scale module, one input end of the FPGA is connected with the output end of the error calculation module, the other input end of the FPGA is connected with the clock module, and the clock module is respectively connected with the voltage verification loop and the current verification loop;
the input end of the error calculation module is respectively connected with the output end of the standard clock reference module, the output end of the daily timing pulse module is connected with the output end of the detected electric energy pulse module, the input end of the daily timing pulse module and the input end of the detected electric energy pulse module are both connected with the pulse output end of the detected electric energy meter, the error calculation module is used for carrying out pulse comparison according to a standard pulse constant stored in advance and pulse signals and pulse signal quantity output by the detected electric energy meter to obtain a pulse error result, the detected electric energy pulse module is used for acquiring the pulse signals of the detected electric energy meter in real time, the daily timing pulse module is used for acquiring the quantity of the pulse signals output by the pulse output end of the detected electric energy meter, and the standard clock reference module is used for providing.
In a further technical scheme, the voltage verification loop comprises a voltage regulation type constant voltage unit, a direct current voltage amplifier, a direct current voltage output terminal, a voltage sampling module, an A/D converter and a D/A converter, wherein one input end of the voltage regulation type constant voltage unit is connected with the FPGA, an output end of the voltage regulation type constant voltage unit is sequentially connected with the direct current voltage amplifier, the direct current voltage output terminal, the voltage sampling module and the A/D converter in series, an output end of the A/D converter is connected to the FPGA, an input end of the D/A converter is connected with the FPGA, an output end of the D/A converter and an output end of the voltage sampling module are connected to the voltage regulation signal module in parallel and then are connected to the other input end of the voltage regulation type constant voltage unit, and the direct current voltage; the current verification loop comprises a voltage regulation type constant current unit, a D/A converter, a direct current output terminal, a broadband direct current comparator and an A/D converter, one input end of the voltage regulation type constant current unit is connected with the FPGA, the output end of the voltage regulation type constant current unit is sequentially connected with the direct current output terminal, the broadband direct current comparator and the A/D converter in series, the output end of the A/D converter is connected to the FPGA, the input end of the D/A converter is connected with the FPGA, the output end of the D/A converter and the output end of the broadband direct current comparator are connected to the current regulation signal module in parallel and then connected with the other input end of the voltage regulation type constant current unit, and the direct current output terminal is connected with a. The maximum output voltage of the dc voltage output terminal is not higher than 1150V, and the maximum output current of the dc current output terminal is not higher than 100A.
And simultaneously, as shown in fig. 1, the utility model discloses an indirect access formula direct current electric energy meter calibrating installation still includes unusual alarm module, operation panel display interface, EEPROM (Electrically Erasable Programmable read only memory), electrified Erasable Programmable read only memory, all kinds of communication interface and error display screen, unusual alarm module is connected with FPGA's another input, operation panel display interface, EEPROM, all kinds of communication interface and error display screen are connected with microprocessor respectively, wherein, microprocessor and operation panel display interface, EEPROM, all kinds of communication interface and error display screen carry out the bidirectional transfer of data.
To sum up, the calibrating apparatus of the present invention generates a dc voltage output signal through a voltage calibrating circuit, and inputs the dc voltage output signal to a voltage terminal of a to-be-tested electric energy meter, generates a dc current output signal through a current calibrating circuit, and inputs the dc current output signal to a current terminal of the to-be-tested electric energy meter, outputs a pulse signal of the to-be-tested electric energy meter, obtains the pulse signal of the to-be-tested electric energy meter in real time through a to-be-tested electric energy pulse module, counts the number of the pulse signal output from a pulse output terminal of the to-be-tested electric energy meter through a daily timing pulse module, performs pulse comparison by an error calculating module according to a standard pulse constant stored in advance and the number of the pulse signal and the pulse signal output from the to-be-tested electric energy meter to obtain a pulse error result, feeds back the pulse error result and the pulse signal output from the to-, meanwhile, standard time can be provided for the error calculation module through the standard clock reference module, the time error of the electric energy meter to be detected is calculated by the standard time and the actual time of the electric energy meter to be detected for sending the pulse signal, and the method has the advantages of accuracy in detection and high detection efficiency.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The direct access type direct current electric energy meter calibrating device is characterized by comprising an upper computer, a microprocessor, an FPGA, a voltage calibrating loop, a current calibrating loop, a transformation module, a temperature compensation time scale module and an error calculation module, wherein the upper computer is connected with the microprocessor, the voltage calibrating loop is connected with a voltage terminal of a to-be-detected electric energy meter, the current calibrating loop is connected with a current terminal of the to-be-detected electric energy meter, the voltage calibrating loop is connected with the current calibrating loop in parallel, the FPGA is respectively connected with the microprocessor, the voltage calibrating loop and the current calibrating loop to perform bidirectional data transmission, an output end of the FPGA is connected with the temperature compensation time scale module, an input end of the FPGA is connected with an output end of the error calculation module, another input end of the FPGA is connected with a clock module, and the clock module is respectively connected with the voltage calibrating loop and the current calibrating loop, the input end of the error calculation module is respectively connected with the output end of the standard clock reference module, the output end of the daily timing pulse module and the output end of the detected electric energy pulse module, and the input end of the daily timing pulse module and the input end of the detected electric energy pulse module are both connected with the pulse output end of the detected electric energy meter.
2. The direct access direct current electric energy meter calibration device according to claim 1, the voltage detection loop comprises a voltage regulation type constant voltage unit, a direct current voltage amplifier, a direct current voltage output terminal, a voltage sampling module, an A/D converter and a D/A converter, one input end of the voltage regulation type constant voltage unit is connected with the FPGA, the output end of the voltage sampling module is sequentially connected in series with a direct current voltage amplifier, a direct current voltage output terminal, a voltage sampling module and an A/D converter, the output end of the A/D converter is connected to the FPGA, the input end of the D/A converter is connected with the FPGA, the output end of the voltage sampling module and the output end of the voltage regulating signal module are connected in parallel to the voltage regulating signal module and then connected to the other input end of the voltage regulating type constant voltage unit, and the direct-current voltage output terminal is connected with the voltage terminal of the electric energy meter to be detected.
3. The direct-access direct-current electric energy meter calibrating device according to claim 1, wherein the current calibrating circuit comprises a voltage-regulating constant-current unit, a D/a converter, a direct-current output terminal, a broadband direct-current comparator and an a/D converter, an input end of the voltage-regulating constant-current unit is connected with the FPGA, an output end of the voltage-regulating constant-current unit is sequentially connected with the direct-current output terminal, the broadband direct-current comparator and the a/D converter in series, an output end of the a/D converter is connected with the FPGA, an input end of the D/a converter is connected with the FPGA, and an output end of the D/a converter and an output end of the broadband direct-current comparator are connected with the current regulating signal module in parallel and then are connected with another input end of.
4. The direct access type direct current electric energy meter calibration device according to claim 1, further comprising an abnormality alarm module, wherein the abnormality alarm module is connected with a further input end of the FPGA.
5. The direct access type direct current electric energy meter calibration device according to claim 1, further comprising an operation console display interface, an EEPROM, various communication interfaces and an error display screen which are respectively connected with the microprocessor, wherein the microprocessor performs bidirectional data transmission with the operation console display interface, the EEPROM, the various communication interfaces and the error display screen.
6. The direct-access direct-current electric energy meter calibration device according to claim 2, wherein the maximum output voltage of the direct-current voltage output terminal is not higher than 1150V.
7. The direct-access direct-current electric energy meter calibration device according to claim 3, wherein the maximum output current of the direct-current output terminal is not higher than 100A.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020534115.XU CN211928157U (en) | 2020-04-13 | 2020-04-13 | Direct access type direct current electric energy meter calibrating device |
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| CN202020534115.XU CN211928157U (en) | 2020-04-13 | 2020-04-13 | Direct access type direct current electric energy meter calibrating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253188A (en) * | 2021-03-30 | 2021-08-13 | 中国电力科学研究院有限公司 | Digital power quality detection method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253188A (en) * | 2021-03-30 | 2021-08-13 | 中国电力科学研究院有限公司 | Digital power quality detection method and device |
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