CN203673058U - Electric energy meter field inspecting apparatus - Google Patents

Abstract

The embodiment of the utility model discloses a field inspection device for an electric energy meter, comprising: a communication interface for collecting the digital electric quantity output by the merging unit within a unit time; A collector; a pulse counter connected to the pulse collector, used to count the number of pulses output by the digital input electric energy meter; and a processor connected to the communication interface and the pulse counter respectively, wherein the The processor has a built-in electric energy calculation formula and a calculation formula for the electric energy value calculated by the electric energy meter, so as to realize on-site inspection of the error situation of the digital input electric energy meter.

Description

A field inspection device for electric energy meter

technical field

The utility model relates to the technical field of on-site inspection of instruments and meters, in particular to an on-site inspection device for electric energy meters.

Background technique

With the popularization of strong and smart grids, digital input energy meters are gradually replacing traditional AC energy meters and are being used more and more widely.

Compared with the AC electric energy meter that measures the electric energy value based on the analog electrical quantity measured and output by the voltage transformer and the current transformer, the digital quantity input electric energy meter is measured by the electronic transformer and is output by the merging unit The forwarded digital electrical quantity is used to measure the electric energy value, and there is a big difference in the measurement mode between the two, so the traditional AC electric energy meter on-site inspection device is not suitable for on-site inspection of the error situation of the digital input electric energy meter, thus How to develop an electric energy meter field inspection device suitable for the digital input electric energy meter has become an urgent problem to be solved by those skilled in the art.

Utility model content

In view of this, the utility model provides an on-site inspection device for an electric energy meter, so as to realize on-site inspection on the error condition of the digital input electric energy meter.

A field inspection device for an electric energy meter, comprising:

A communication interface for collecting digital electrical quantities output by the merging unit within a unit time;

A pulse collector that collects the output pulses of the digital input electric energy meter within the unit time;

A pulse counter connected to the pulse collector is used to count the number of pulses output by the digital input electric energy meter;

And a processor connected to the communication interface and the pulse counter respectively, wherein the processor has a built-in electric energy calculation formula and an electric energy value calculation formula calculated by the electric energy meter.

Wherein, the communication interface includes an optical fiber interface.

Optionally, the electric energy meter on-site inspection device also includes:

An AC sampling module for collecting the analog electrical quantity output by the voltage transformer and the current transformer within a unit time; and an analog-to-digital converter connected to the AC sampling module.

Wherein, the AC sampling module includes:

A first AC sampling module, configured to collect the analog voltage signal output by the voltage transformer;

and a second AC sampling module, configured to collect the analog current signal output by the current transformer.

Wherein, the processor includes an arithmetic operation circuit.

Wherein, the arithmetic operation circuit includes a multiplier and a divider.

Optionally, the electric energy meter field inspection device further includes: a display connected to the processor.

Wherein, the display includes a liquid crystal display.

Optionally, the electric energy meter on-site inspection device further includes: a wireless communication module connected to the processor.

Wherein, the electric energy meter on-site inspection device is an integrated molding structure.

It can be seen from the above technical scheme that when the digital quantity input electric energy meter is used as the electric meter under test, the utility model only needs to connect the communication interface to the output end of the merging unit, and connect the pulse collector to the pulse of the electric meter under test at the same time. The signal output terminal can respectively obtain the digital electrical quantity output by the merging unit in unit time, and the output pulse of the measured electric meter in unit time; the processor uses the built-in The actual electric energy value can be calculated by using the electric energy calculation formula, and at the same time, according to the statistical number of output pulses, the electric energy value calculated by the built-in electric energy meter can be used to calculate the electric energy value of the measured electric meter; , by comparing the difference between the actual electric energy value and the calculated electric energy value, the error level of the measured electric meter can be determined, thereby achieving the purpose of on-site inspection of the error situation of the digital input electric energy meter, It is beneficial to the further popularization and application of the digital quantity input electric energy meter.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of an electric energy meter field inspection device disclosed in Embodiment 1 of the present invention;

Fig. 2 is a structural schematic diagram of another electric energy meter field inspection device disclosed in Embodiment 2 of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to Fig. 1, Embodiment 1 of the present utility model discloses a field inspection device for an electric energy meter, which is applied to a digital quantity input electric energy meter to realize on-site inspection of the error situation of the digital quantity input electric energy meter, including:

A communication interface 100 for collecting digital electrical quantities output by the merging unit within a unit time;

A pulse collector 200 that collects the output pulses of the digital input electric energy meter within the unit time;

The pulse counter 300 that links to each other with pulse collector 200, is used for counting the pulse number that described digital input electric energy meter outputs;

And a processor 400 connected to the communication interface 100 and the pulse counter 300 respectively, wherein the processor 400 has a built-in electric energy calculation formula and an electric energy value calculation formula calculated by the electric energy meter.

In the first embodiment, since the processor 400 has built-in the calculation formula of the electric energy and the calculation formula of the electric energy value calculated by the electric energy meter, the processor 400 can be used to use the digital electric quantity output by the combining unit to use the The electric energy calculation formula calculates the electric energy value actually consumed in the unit time; at the same time, according to the number of pulses counted by the pulse counter 300, the calculation formula of the electric energy value calculated by the electric energy meter (that is, the number of pulses and the digital quantity Input the corresponding relationship between the electric energy values measured by the electric energy meter), and calculate the electric energy value measured by the digital input electric energy meter.

Wherein, the processor 400 includes an arithmetic operation circuit, that is, both the electric energy calculation formula and the electric energy value calculation formula calculated by the electric energy meter exist in the processor 400 in the form of an arithmetic operation circuit, so as to realize corresponding calculation functions. Wherein the arithmetic operation circuit includes a multiplier, a divider and the like.

Specifically, the digital quantity input watt-hour meter mainly measures the electric energy value according to the digital electric quantity measured by the electronic transformer and forwarded by the merging unit; The electronic voltage transformer for the digital voltage signal, and the electronic current transformer for measuring the digital current signal of the tested line; the merging unit is used for the electronic voltage transformer and the electronic current transformer The digital electrical quantities (including the digital voltage signal and the digital current signal) sent by the transformer once are merged and processed synchronously, and the processed digital electrical quantities are forwarded to the digital input electric energy meter according to a specific format, Realize the measurement of the electric energy value consumed in the corresponding time period T; generally, the merging unit composes a digital frame according to the IEC61850 standard format, and sends it to the digital input electric energy meter.

During the working process of the electric energy meter (including the digital input electric energy meter and the traditional AC electric energy meter), its pulse signal output terminal continuously outputs the pulse signal; corresponding to the number N of the pulse signal output in the period T, the electric energy meter There is the following corresponding relationship between the constant C and the electric energy value W measured by the electric energy meter in the corresponding period T (that is, the calculation formula of the electric energy value measured by the electric energy meter):

W=N/C,

Wherein, the electric energy meter constant, that is, the proportional constant between the indicator of the electric energy meter counter and the number of revolutions of the turntable, unit r/(kWh), is a factory set value; the indicator of the electric energy meter counter , that is, the electric energy value W measured by the electric energy meter in the corresponding time period T, and the unit is kWh;

This embodiment one follows the measurement mode and interface mode of the digital input electric energy meter, and when the error situation of the digital input electric energy meter needs to be inspected on site, the communication interface 100 is connected to the output of the merging unit At the same time, the pulse collector 200 is connected to the pulse signal output terminal of the digital input electric energy meter to obtain the digital electric quantity output by the merging unit per unit time and the output of the digital input electric energy meter respectively. pulse; the processor 400 can calculate the actual consumed electric energy value in the unit time according to the obtained digital electric quantity by using the known electric energy calculation formula; C formula, the electric energy value currently measured by the digital input electric energy meter can be calculated;

At this time, by comparing the difference between the actual consumed electric energy value corresponding to the unit time and the electric energy value measured by the digital input electric energy meter, the error level of the digital input electric energy meter can be determined, In this way, on-site inspection of the error situation of the digital input electric energy meter is realized, which facilitates the further popularization and application of the digital input electric energy meter; it should be noted that the duration of the unit time can be specifically set as required. set, not limited.

In addition, when the merging unit sends the digital electrical quantity to the digital input electric energy meter in the form of a digital optical fiber signal based on the IEC61850 standard, correspondingly, the electric energy meter field inspection device described in the first embodiment also needs Correspondingly, an optical fiber interface for receiving the signal is provided, that is, the communication interface 100 includes an optical fiber interface.

Based on Embodiment 1, Embodiment 2 of the present utility model discloses another electric energy meter on-site inspection device, which is applied to a digital quantity input electric energy meter or an AC electric energy meter, so as to realize the inspection of the digital quantity input electric energy meter or the AC electric energy meter On-site inspection of the error situation, see Figure 2, including:

Communication interface 100, pulse collector 200, pulse counter 300, processor 400, AC sampling module 500 and analog-to-digital converter 600;

Among them, the communication interface 100 is used to collect the digital electrical quantity output by the merging unit within a unit time;

The pulse collector 200 is used to collect the output pulse of the digital input electric energy meter or the AC electric energy meter in the unit time;

The pulse counter 300 is connected with the pulse collector 200, and is used for counting the number of pulses output by the digital input electric energy meter or the AC electric energy meter;

The AC sampling module 500 is used to collect the analog electrical quantity output by the voltage transformer and the current transformer within a unit time; wherein, the AC sampling module 500 may specifically include a first module for collecting the analog voltage signal output by the voltage transformer. an AC sampling module, and a second AC sampling module for collecting the analog current signal output by the current transformer;

An analog-to-digital converter 600 connected to the AC sampling module 500, configured to convert the analog electrical quantity into a digital electrical quantity;

The processor 400 is respectively connected with the communication interface 100 and the pulse counter 300, and is used to calculate the actual consumed electric energy value by using the built-in electric energy calculation formula, and at the same time, use the built-in electric energy meter calculation formula to calculate the said digital quantity Input the electric energy value calculated by the electric energy meter or the AC electric energy meter.

From the relevant description of Embodiment 1, it can be known that when it is necessary to carry out on-site inspection of the error situation of the digital input electric energy meter, it is only necessary to connect the communication interface 100 to the output terminal of the merging unit, and at the same time connect the pulse collector 200 to the output terminal of the merging unit. Input the pulse signal output end of described digital quantity input watt-hour meter and get final product; At this moment, AC sampling module 500 and analog-to-digital converter 600 are all in non-working state;

The AC watt-hour meter mainly measures the electric energy value based on the analog electrical quantity measured and output by the voltage transformer and the current transformer. Therefore, when the error condition of the AC watt-hour meter needs to be inspected on site, only the AC watt-hour meter needs to be tested. The sampling module 500 is connected to the output terminals of the voltage transformer and the current transformer, and at the same time, the pulse collector 200 is connected to the pulse signal output terminal of the AC electric energy meter; at this time, the processor 400 according to the modulus The digital electrical quantity output by the converter 600 can be calculated by using the electric energy calculation formula to obtain the actual consumed electric energy value, and at the same time, according to the number of pulses output by the AC electric energy meter, the AC can be calculated by using the W=N/C formula The electric energy value measured by the electric energy meter, thus, by comparing the difference between the actual consumed electric energy value corresponding to the unit time and the electric energy value measured by the AC electric energy meter, the AC electric energy meter can be determined The error level, so as to realize the on-site inspection of the error situation of the communication.

Compared with the first embodiment, the electric energy meter field inspection device disclosed in the second embodiment has both the digital input electric energy meter field inspection function and the AC electric energy meter field inspection function, which saves investment costs and improves the economic benefits of the enterprise.

In addition, as a preference, the electric energy meter field inspection device described in any of the above embodiments can also include: a display connected to the processor 400, the display can be used to display various input and output parameters obtained and output by the processor 400, In order to facilitate the staff to input the digital quantity into the electric energy meter or the on-site inspection result of the AC electric energy meter.

In addition, the electric energy meter field inspection device described in any of the above embodiments may further include: a wireless communication module connected to the processor 400 for uploading processing results to a remote monitoring center to realize remote monitoring of field inspection results.

Considering the portability of the electric energy meter field inspection device, the electric energy meter field inspection device is designed with an integrated molding structure, that is, each component module in the electric energy meter field inspection device is installed on a circuit board .

To sum up, when the digital input electric energy meter is used as the electric meter under test, the utility model only needs to connect the communication interface to the output end of the merging unit, and at the same time connect the pulse collector to the pulse signal output end of the electric meter under test. That is, the digital electrical quantity output by the merging unit within a unit time and the output pulse of the meter under test within a unit time can be respectively obtained; the processor uses the built-in electric energy calculation formula according to the obtained digital electrical quantity The actual electric energy value can be calculated, and at the same time, according to the statistical number of the output pulses, the electric energy value calculated by the built-in electric energy meter can be used to calculate the electric energy value calculated by the electric energy meter under test; at this time, by comparing The difference between the actual electric energy value and the calculated electric energy value can determine the error level of the measured electric meter, thereby achieving the purpose of on-site inspection of the error situation of the digital quantity input electric energy meter, which is beneficial to the Further popularization and application of digital quantity input electric energy meter.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. an electric energy meter field verifying attachment, is characterized in that, comprising:

The communication interface of the digital electric amount that collection merge cells is exported within the unit interval;

Gather the Pulse sampling device of the output pulse of digital quantity input electric energy meter within the described unit interval;

The impulse meter being connected with described Pulse sampling device, for adding up the pulse number of described digital quantity input electric energy meter output;

And the processor being connected with described impulse meter with described communication interface respectively, the built-in electric energy computing formula of wherein said processor and electric energy meter are counted energy value computing formula.

2. electric energy meter field verifying attachment according to claim 1, is characterized in that, described communication interface comprises optical fiber interface.

3. electric energy meter field verifying attachment according to claim 1, is characterized in that, described electric energy meter field verifying attachment also comprises:

The AC sampling module of the analog electrical tolerance that collection voltage transformer (VT) summation current transformer is exported within the unit interval;

And the analog to digital converter being connected with described AC sampling module.

4. electric energy meter field verifying attachment according to claim 4, is characterized in that, described AC sampling module comprises:

The first AC sampling module, for gathering the analog voltage signal of described voltage transformer (VT) output;

With the second AC sampling module, for gathering the analog current signal of described current transformer output.

5. electric energy meter field verifying attachment according to claim 1, is characterized in that, described processor comprises arithmetic circuity.

6. electric energy meter field verifying attachment according to claim 5, is characterized in that, described arithmetic circuity comprises multiplier and divider.

7. according to the electric energy meter field verifying attachment described in any one in claim 1-6, it is characterized in that, described electric energy meter field verifying attachment also comprises: the display being connected with described processor.

8. electric energy meter field verifying attachment according to claim 7, is characterized in that, described display comprises liquid crystal display.

9. according to the electric energy meter field verifying attachment described in any one in claim 1-6, it is characterized in that, described electric energy meter field verifying attachment also comprises: the wireless communication module being connected with described processor.

10. electric energy meter field verifying attachment according to claim 9, is characterized in that, the integrated molding structure of described electric energy meter field verifying attachment.

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