CN210109301U - Digital electric energy meter and power source magnitude traceability remote calibration system - Google Patents

Digital electric energy meter and power source magnitude traceability remote calibration system Download PDF

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Publication number
CN210109301U
CN210109301U CN201822191213.3U CN201822191213U CN210109301U CN 210109301 U CN210109301 U CN 210109301U CN 201822191213 U CN201822191213 U CN 201822191213U CN 210109301 U CN210109301 U CN 210109301U
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China
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electric energy
digital
energy meter
power source
meter
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CN201822191213.3U
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Chinese (zh)
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李林
邱忠梅
曹珂
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JIANGSU MEASURING SCIENCE INSTITUTE
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JIANGSU MEASURING SCIENCE INSTITUTE
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Abstract

The utility model provides a digital electric energy meter and power source value traceability remote calibration system, which is used for remotely calibrating a tested electric energy meter and comprises three calibration systems of a remote analog power source, a remote digital power source and a field digital power source; the system is simple in structure and low in manufacturing cost, can check the grade influence of system delay on the detected electric energy equipment, realizes quick, accurate and effective value traceability check of the digital electric energy meter and a power source, and greatly reduces time, labor and financial cost under the condition of not needing an upper computer.

Description

Digital electric energy meter and power source magnitude traceability remote calibration system
Technical Field
The utility model relates to a digital electric energy meter and power source quantity value long-range check-up system of tracing to source belongs to instrument and meter measurement technical field.
Background
The digital electric meter is a part of a novel digital metering system of an intelligent substation and is used for metering electric energy of multi-path outgoing lines. The signals processed by the digital electric energy meter are digital frames transmitted by the Ethernet, and errors can not appear theoretically, but because the word length of an internal processor of the electric energy meter is limited, truncation errors can be generated when numerical value operation is carried out; meanwhile, the electric energy calculation algorithm is approximate calculation after discretization processing is carried out on signals in a continuous domain, so certain deviation can be caused; furthermore, the effects of grid signal frequency fluctuations, harmonics and asynchronous sampling (delays) can also lead to metering device errors. Therefore, the digital electric energy meter must be checked and traced to the source.
The checking and detecting work of the digital electric energy meter is relatively lagged, at present, although a plurality of research organizations carry out beneficial attempts in the aspects of checking method research, checking device development and the like, and obtain certain results, the research results are not complete enough, and a plurality of problems exist, such as the completeness of a tracing method, technical indexes of a checking system, checking specifications and the like, which need deep analysis research. Digital electric energy meter checking systems are developed successively by multiple domestic organizations, and digital electric energy meters are tested externally, but the test work is only trial test and does not have strict metering performance traceability and evaluation analysis capability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a digital electric energy meter and power source magnitude remote check-up system of tracing to source solves the prior art defect, realizes the active check-up and the reactive check-up of digital electric energy meter, under the condition that need not to use upper computer, directly carries out the check-up work through the operating panel control system of system setting.
In order to realize the purpose, the utility model provides a technical scheme is: a remote calibration system for tracing the source of a digital electric energy meter and a power source magnitude is used for constructing a remote calibration system for a tested electric energy meter and comprises three calibration systems of a remote analog power source, a remote digital power source and an on-site digital power source,
the remote analog power source verification system comprises a program-controlled analog signal source, a digital electric energy meter calibrator 1 and a tested electric energy meter, wherein the digital electric energy meter calibrator 1 receives a signal of the program-controlled analog signal source and is connected with the tested electric energy meter to perform calibration signal transmission; the remote digital power supply verification system comprises a digital electric energy meter calibrator 2 and a tested electric energy meter, wherein the digital electric energy meter 2 is connected with the tested electric energy meter to perform verification signal transmission;
the field digital power supply calibration system comprises a merging unit, a tested electric energy meter and a digital electric energy meter calibration instrument 3, wherein the digital electric energy meter calibration instrument 3 receives signals of the merging unit and is connected with the tested electric energy meter to perform calibration signal transmission.
The digital electric energy meter calibrator 1 further comprises a high-precision A/D conversion module, a standard meter calculation module, an error calculation module, a protocol package module and an optical Ethernet interface, wherein an external program control analog signal source outputs voltage analog quantity and current analog quantity required by testing, the voltage analog quantity and the current analog quantity are converted into voltage digital quantity and current digital quantity through the high-precision A/D conversion module, the voltage digital quantity and the current digital quantity obtain electric energy value digital quantity through the standard meter calculation module and are sent to the error calculation module, the voltage digital quantity and the current digital quantity are transmitted to a digital meter to be tested through the protocol package module and the optical Ethernet interface, and the electric energy value digital quantity generated by the electric energy meter to be tested is sent to the error calculation module to calculate the electric energy error.
The digital electric energy meter calibrator 2 further comprises a standard meter calculation module, a standard digital power supply module, an error calculation module and an Ethernet interface, voltage digital quantity and current digital quantity are set through the standard digital power supply module, the electric energy value digital quantity is obtained through the standard meter calculation module and then is sent to the error calculation module, the set voltage digital quantity and current digital quantity are transmitted to the measured electric energy meter through the Ethernet interface, and the electric energy value digital quantity generated by the measured electric energy meter is sent to the error calculation module to calculate the electric energy error.
The further digital electric energy meter check meter 3 comprises a standard meter calculation module, an optical Ethernet interface 1, an optical Ethernet interface 2 and an error calculation module, wherein the optical Ethernet interface 1 receives the sampling value data messages from the merging unit and analyzes the voltage digital quantity and the current digital quantity in the sampling value data messages, the voltage digital quantity and the current digital quantity are transmitted to the error calculation module after the electric energy value digital quantity is obtained by the standard meter calculation module, the messages received by the optical Ethernet interface 1 are transmitted to the electric energy meter to be measured through the optical Ethernet interface 2, the electric energy value digital quantity generated by the electric energy meter to be measured is transmitted to the error calculation module, and the electric energy error is calculated.
The digital electric energy meter calibrator 1, the digital electric energy meter calibrator 2 and the digital electric energy meter calibrator 3 are further provided with operation panels respectively.
The utility model has the advantages that: under the condition of not needing the host computer, this system simple structure, cost are lower, and can check-up system delay to the grade influence of being examined electric energy equipment, realize quick, accurate, effectual quantity value traceability check-up of digital electric energy meter and power source, greatly reduced time, manpower and financial cost.
Drawings
FIG. 1 is a schematic diagram of a remote analog power source verification system;
FIG. 2 is a schematic diagram of a remote digital power source verification system;
fig. 3 is a schematic diagram of a field digital power source verification system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Embodiment as shown in fig. 1, fig. 2 and fig. 3, the embodiment provides a digital electric energy meter and a power source quantity value tracing remote calibration system, which performs remote calibration on a measured electric energy meter, and includes three calibration systems of a remote analog power source, a remote digital power source and an on-site digital power source,
the remote analog power source verification system comprises a program-controlled analog signal source, a digital electric energy meter calibrator 1 and a tested electric energy meter, wherein the digital electric energy meter calibrator 1 receives a signal of the program-controlled analog signal source and verifies the tested electric energy meter;
the remote digital power supply verification system comprises a digital electric energy meter calibrator 2 and a to-be-detected electric energy meter, and the digital electric energy meter 2 is used for verifying the to-be-detected electric energy meter;
the field digital power supply calibration system comprises a merging unit, a tested electric energy meter and a digital electric energy meter calibration instrument 3, wherein the digital electric energy meter calibration instrument 3 receives signals of the merging unit and calibrates the tested electric energy meter.
A digital electric energy meter is verified by adopting a remote analog power source verification system, and the method comprises the following specific steps:
the first step is as follows: the external program-controlled analog power source is started, voltage analog quantity and current analog quantity required by testing are output, and the voltage analog quantity and the current analog quantity are converted into voltage digital quantity U (220V) and current digital quantity I (4A) through the internal high-precision AD conversion module.
The second step is that: the electric energy value digital quantity W is obtained by utilizing a standard meter electric energy calculating module,
W=UIt
(7)
when the working time t is 60 seconds, W is 52800.00J
The third step: the protocol package module and the Ethernet interface are utilized to transmit the voltage digital quantity U and the current digital quantity I to the electric energy meter to be tested, and the electric energy meter to be tested can generate an electric energy value digital quantity W0=52801.00J。
The fourth step: digital quantity W of electric energy value generated by electric energy meter to be tested0Sending the data into an error calculation module, calculating the electric energy error gamma which is 0.001894 percent,
in the formula, W is the digital quantity of the electric energy value obtained by the standard meter electric energy calculating module, and the unit is Joule; w0Is the digital quantity of the electric energy value generated by the detected electric energy meter, and the unit is joule.
A remote digital power source calibration system is adopted to calibrate a digital electric energy meter, and the method comprises the following specific steps:
the first step is as follows: a voltage digital quantity U-220V and a current digital quantity I-220V are arranged on the system interface.
The second step is that: the electric energy value digital quantity W is obtained by utilizing a standard meter electric energy calculating module,
W=UIt
(9)
when the working time t is 60 seconds, W is 52800.00J
The third step: the protocol package module and the Ethernet interface are utilized to transmit the voltage digital quantity U and the current digital quantity I to the electric energy meter to be tested, and the electric energy meter to be tested can generate an electric energy value digital quantity W0=52801.00J。
The fourth step: digital quantity W of electric energy value generated by electric energy meter to be tested0Sending the data into an error calculation module, calculating the electric energy error gamma which is 0.001894 percent,
in the formula, W is the digital quantity of the electric energy value obtained by the standard meter electric energy calculating module, and the unit is Joule; w0Is the digital quantity of the electric energy value generated by the detected electric energy meter, and the unit is joule.
A digital electric energy meter is verified by adopting a field digital power source verification system, and the method comprises the following specific steps:
the first step is as follows: the optical port 1 of the digital electric energy meter calibrator receives the data message of the sampling value from the merging unit and analyzes the voltage digital quantity U-220V and the current digital quantity I-4A.
The second step is that: the electric energy value digital quantity W is obtained by utilizing a standard meter electric energy calculating module,
W=UIt
(11)
when the working time t is 60 seconds, W is 52800.00J
The third step: the received message is sent to the detected electric energy meter through the Ethernet interface 2, and the detected electric energy meter can generate electric energy value digital quantity W0=52801.00J。
The fourth step: digital quantity W of electric energy value generated by electric energy meter to be tested0Sending the data into an error calculation module, calculating the electric energy error gamma which is 0.001894 percent,
in the formula, W is the digital quantity of the electric energy value obtained by the standard meter electric energy calculating module, and the unit is Joule; w0Is generated by a detected electric energy meterThe unit of the electric energy value is joule.

Claims (5)

1. The utility model provides a digital electric energy meter and power source magnitude remote check-up system of tracing to the source, carries out remote check-up system to being surveyed the electric energy meter and constructs, its characterized in that: comprises three checking systems of a remote analog power source, a remote digital power source and an on-site digital power source,
the remote analog power source verification system comprises a program-controlled analog signal source, a digital electric energy meter calibrator 1 and a tested electric energy meter, wherein the digital electric energy meter calibrator 1 receives a signal of the program-controlled analog signal source and is connected with the tested electric energy meter to perform calibration signal transmission;
the remote digital power supply verification system comprises a digital electric energy meter calibrator 2 and a tested electric energy meter, wherein the digital electric energy meter 2 is connected with the tested electric energy meter to perform verification signal transmission;
the field digital power supply calibration system comprises a merging unit, a tested electric energy meter and a digital electric energy meter calibration instrument 3, wherein the digital electric energy meter calibration instrument 3 receives signals of the merging unit and is connected with the tested electric energy meter to perform calibration signal transmission.
2. The digital electric energy meter and power source magnitude traceability remote verification system of claim 1, wherein: the digital electric energy meter calibrator 1 comprises a high-precision A/D conversion module, a standard meter calculation module, an error calculation module, a protocol package module and an optical Ethernet interface, wherein an external program-controlled analog signal source outputs voltage analog quantity and current analog quantity required by testing, the voltage analog quantity and the current analog quantity are converted into voltage digital quantity and current digital quantity through the high-precision A/D conversion module, the voltage digital quantity and the current digital quantity obtain electric energy value digital quantity through the standard meter calculation module and are sent to the error calculation module, the voltage digital quantity and the current digital quantity are transmitted to a digital meter to be tested through the protocol package module and the optical Ethernet interface, and the electric energy value digital quantity generated by the electric energy meter to be tested is sent to the error calculation module to calculate the electric energy error.
3. The digital electric energy meter and power source magnitude traceability remote verification system of claim 1, wherein: the digital electric energy meter calibrator 2 comprises a standard meter calculation module, a standard digital power supply module, an error calculation module and an Ethernet interface, wherein voltage digital quantity and current digital quantity are set through the standard digital power supply module, the electric energy value digital quantity is obtained through the standard meter calculation module and then is sent to the error calculation module, the set voltage digital quantity and current digital quantity are transmitted to a measured electric energy meter through the Ethernet interface, and the electric energy value digital quantity generated by the measured electric energy meter is sent to the error calculation module to calculate the electric energy error.
4. The digital electric energy meter and power source magnitude traceability remote verification system of claim 1, wherein: the digital electric energy meter check gauge 3 comprises a standard meter calculation module, an optical Ethernet interface 1, an optical Ethernet interface 2 and an error calculation module, wherein the optical Ethernet interface 1 receives a sampling value data message from the merging unit and analyzes a voltage digital quantity and a current digital quantity in the sampling value data message, the voltage digital quantity and the current digital quantity are transmitted to the error calculation module after electric energy value digital quantity is obtained by the standard meter calculation module, the message received by the optical Ethernet interface 1 is transmitted to a measured electric energy meter through the optical Ethernet interface 2, the electric energy value digital quantity generated by the measured electric energy meter is transmitted to the error calculation module, and an electric energy error is calculated.
5. The digital electric energy meter and power source magnitude traceability remote verification system of claim 1, 2, 3 or 4, wherein: the digital electric energy meter calibrator 1, the digital electric energy meter calibrator 2 and the digital electric energy meter calibrator 3 are respectively provided with an operation panel.
CN201822191213.3U 2018-12-26 2018-12-26 Digital electric energy meter and power source magnitude traceability remote calibration system Active CN210109301U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201822191213.3U CN210109301U (en) 2018-12-26 2018-12-26 Digital electric energy meter and power source magnitude traceability remote calibration system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201822191213.3U CN210109301U (en) 2018-12-26 2018-12-26 Digital electric energy meter and power source magnitude traceability remote calibration system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111398883A (en) * 2020-02-28 2020-07-10 国网湖南省电力有限公司 Electric energy meter truncation error online evaluation method, system and medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111398883A (en) * 2020-02-28 2020-07-10 国网湖南省电力有限公司 Electric energy meter truncation error online evaluation method, system and medium
CN111398883B (en) * 2020-02-28 2022-03-11 国网湖南省电力有限公司 Electric energy meter truncation error online evaluation method, system and medium

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