CN106338705B - A kind of method and apparatus of the verification error for three-phase electric energy metering device - Google Patents
A kind of method and apparatus of the verification error for three-phase electric energy metering device Download PDFInfo
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Abstract
The present invention is suitable for electrical energy measurement field, provide a kind of method and apparatus of verification error for three-phase electric energy metering device, wherein, the three-phase electric energy metering device is made of three single-phase electric energy metering units, the single-phase electric energy metering units are used to complete the electrical energy measurement of each phase line, the single-phase electric energy metering device of at least one known universe error amount is accessed on any line road of the three-phase electric energy metering device as error criterion device, three-phase electric energy metering device, each single-phase electric energy metering units and error criterion device measure the energy data of itself route and are reported to the global error considered according to load current segmentation that error processor calculates three-phase electric energy metering device.The embodiment of the present invention realizes the self checking of three-phase electric energy metering device error, overcomes the prior art and needs special setting test environment, is equipped with the low of verification efficiency caused by fc-specific test FC instrument.Also, it overcomes and calculates electric energy meter mean error result in the prior art and be not available in the assessment of industrial error amount.
Description
Technical Field
The invention belongs to the field of electric energy metering, and particularly relates to a method and a device for checking errors of a three-phase electric energy metering device.
Background
For the three-phase electric energy metering device in use, it is difficult to judge whether the metering error is out of tolerance. Mainly because: firstly, an electric energy metering device is generally formed by three components, namely a current transformer, a voltage transformer and an electric energy meter. The error of the device is a comprehensive error calculated by the measuring accuracy of the three components. The comprehensive error has the use defects that: it is not, but not directly measurable. More seriously, the real overall error of the electric energy metering device is likely to be larger than the comprehensive error of the electric energy metering device and is not easy to measure. And secondly, the field calibration of errors of the current transformer and the voltage transformer must be carried out by power failure, so that inconvenience is brought to users, and power supply loss is caused. And thirdly, the error field calibration of the three components of the electric energy metering device consumes labor hour, and because the metering circuit boards and circuits thereof which are installed in China are measured in hundreds of millions, the field calibration work of all the errors of the metering device cannot be completed according to the regulations by manpower and material resources of each power supply company.
At present, the remote automatic meter reading technology of the intelligent electric meter is mature and is popularized and opened worldwide. If the method can get rid of the dependence on the use of external standard instruments, only reads the electric energy data of the cluster electric energy meters, performs calculation and analysis, and calculates the overall error of each electric energy metering device, the real error of the electric energy metering device can be correctly judged, the operation and maintenance cost of the electric energy meters in use can be reduced, and the legal interests of both electric energy suppliers and consumers can be protected.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for checking errors of a three-phase electric energy metering device. The method and the device solve the problems that the whole error cannot be detected, the errors of the current transformer and the voltage transformer of the metering device can be detected on site only by power failure in the prior art, and the metering device cannot be used for legal and regulatory detection when the number of the metering devices is too large. And improves the usability and accuracy of the overall error detection value.
The embodiment of the invention is realized in such a way that, on one hand, a method for checking errors of a three-phase electric energy metering device is provided, the three-phase electric energy metering device is composed of three single-phase electric energy metering units, the single-phase electric energy metering units are used for completing electric energy metering of each phase line, a single-phase electric energy metering device with a known overall error value is connected to any line of the three-phase electric energy metering device as an error standard device, the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device measure electric energy data of the line and report the electric energy data to an error processor to calculate the overall error of the three-phase electric energy metering device according to sectional consideration of load current, the method comprises the following:
the three-phase electric energy metering device and the single-phase electric energy metering unit in the three-phase electric energy metering device belong to a non-energy-consumption system, and the sum of the electric energy flowing through the single-phase electric energy metering unit is equal to the electric energy value metered by the three-phase electric energy metering device; an error standard device of the known integral error value is connected in series with any line of the three-phase electric energy metering device; the error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded so as to reduce the influence of electromagnetic interference to a preset threshold value; the three-phase electric energy metering device and the error standard device measure and record respective electric energy data according to a preset mode, and report the electric energy data to the error processor; the data reported by the three-phase electric energy metering device comprises the electric energy sum metered by the three-phase electric energy metering device and the electric energy value of each single-phase electric energy metering unit; and the error processor calculates the overall error of the three-phase electric energy metering device according to the load current sectional consideration according to the received electric energy data subjected to data processing.
Preferably, the overall error is a true error of the three-phase electric energy metering device in the operating state, and the single-phase electric energy metering unit includes an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor, and specifically includes:
the method comprises the steps of calculating the error sum caused by the self-metering accuracy of an electric energy metering chip and a circuit thereof, a current transformer and a voltage transformer, and the error sum caused by other influencing factors; wherein, the sum of errors caused by other influencing factors comprises: the error caused by the influence of the electromagnetic environment of the three parts on the self and the error caused by the mutual interference of the three parts.
Preferably, the three-phase electric energy metering device and each single-phase electric energy metering unit measure and record electric energy data of respective lines, and the method specifically includes:
determining the load current segment to which the electric energy data belongs according to the measured electric energy data and the load current value; and searching the position corresponding to the load current segment in the storage area to finish recording and storing.
Preferably, the data error processor specifically includes: the error processor receives electric energy and related current data from a three-phase electric energy metering device in a system to be tested and electric energy and related current data from an error standard device, wherein the electric energy and related current data of the three-phase electric energy metering device comprise electric energy and related current data metered by the three-phase electric energy metering device and electric energy and related current data metered by each single-phase electric energy metering unit in the three-phase electric energy metering device; determining and classifying the load current segment to which the electric energy data belongs according to the current data; and storing the electric energy data which are classified and processed according to the load current.
Preferably, the data error processor includes: the device comprises a three-phase electric energy metering device for measuring the electric energy data, a single-phase electric energy metering unit, an error standard device or an error calculator.
Preferably, the error processor calculates an overall error of the three-phase electric energy metering device, which is considered in a segmented manner according to the load current, according to the received electric energy data subjected to data processing, and specifically includes:
according to the fact that the electric energy data recorded by the three-phase electric energy metering device and the single-phase electric energy metering unit meet the principle of electric energy conservation, the electric energy data recorded by the three-phase electric energy metering device and the electric energy data recorded by the single-phase electric energy metering unit in the appointed time are combined with error value variables under the load current segmentation respectively to construct an energy balance equation, N equations can be formed by reading the electric energy data of the system to be tested for N times, and an equation set is formed, wherein N is a natural number; the energy balance equation set comprises error value variables of each single-phase electric energy metering unit in each load current segment; the error processor acquires the stored electric energy data of the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device in the corresponding load current section; and the electric energy data is segmented according to the corresponding load current, substituted into an energy balance equation set to serve as a coefficient of a corresponding error value variable, the energy balance equation set is solved by using the known error of an error standard device, the error value of each single-phase electric energy metering unit in each load current segment is obtained, and the electric energy metering error of the three-phase electric energy metering device is further obtained.
Preferably, the preset mode specifically includes:
setting the three-phase electric energy metering device and the error standard device to segment according to the specified time and the load current, measuring and recording respective electric energy data, classifying, distinguishing, storing and reporting to the error calculator according to the load current segments; or setting the three-phase electric energy metering device and the error standard device to measure and record respective electric energy data and current data according to specified time, and reporting the electric energy data and the current data to the error processor.
On the other hand, an embodiment of the present invention further provides a method for checking an error of a three-phase electric energy metering device, where the three-phase electric energy metering device is composed of two single-phase electric energy metering units, the single-phase electric energy metering units are used to complete electric energy metering of each phase circuit, an error standard with a known overall error value is connected to any phase circuit of the three-phase electric energy metering device, the three-phase electric energy metering device and the error standard measure electric energy data of their own circuits and report the electric energy data to an error processor to calculate an overall error of the three-phase electric energy metering device according to a sectional consideration of a load current, and the method includes:
the three-phase electric energy metering device and the single-phase electric energy metering units in the three-phase electric energy metering device form a non-energy consumption system, and the sum of the electric energy flowing through each single-phase electric energy metering unit is equal to the electric energy value metered by the three-phase electric energy metering device; connecting an error standard device with the known integral error value on any phase line of the three-phase electric energy metering device according to the connection mode of any single-phase electric energy metering unit in the three-phase electric energy metering device; the error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded so as to reduce the influence of electromagnetic interference to a preset threshold value; the three-phase electric energy metering device and the error standard device measure and record respective electric energy data according to a preset mode, and report the electric energy data to the error processor; the data reported by the three-phase electric energy metering device comprises the electric energy sum metered by the three-phase electric energy metering device and the electric energy value metered by each single-phase electric energy metering unit; the error processor calculates the overall error of each single-phase electric energy metering unit according to the load current sectional consideration according to the received electric energy data subjected to data processing, and further calculates the overall error of the three-phase electric energy metering device.
In another aspect, the present invention further provides an error processor for checking an error of a three-phase electric energy metering device, where the error processor includes a data transceiver unit, a storage unit, and a processing module, and specifically includes:
the data receiving and sending unit is used for receiving electric energy data reported by the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device in the system to be tested, and sending various electric energy and related data; the storage unit is used for storing various electric energy and related data; the processing module is used for analyzing the electric energy data reported by the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device, determining the load current segment to which the electric energy data belongs, and storing the electric energy data into the storage unit according to the corresponding relation among the three-phase electric energy metering device identifier, each single-phase electric energy metering unit identifier or the error standard device identifier, the load current segment and the electric energy data; and the processing module is also used for calculating the integral error of the three-phase electric energy metering device according to the electric energy data.
Preferably, the processing module is further configured to calculate an overall error of each three-phase electric energy metering device according to the electric energy data, and further includes:
the processing module combines the electric energy data recorded by the three-phase electric energy metering device and the electric energy data recorded by the single-phase electric energy metering unit in a specified time with respective error value variables under the load current segmentation to construct an energy balance equation, and N equations can be formed and form an equation set by reading the electric energy data of the system to be tested for N times, wherein N is a natural number; the energy balance equation set comprises error value variables of each single-phase electric energy metering unit in each load current segment; the error processor acquires the stored electric energy data of the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device in the corresponding load current section; and the electric energy data is segmented according to the corresponding load current, substituted into an energy balance equation set to serve as a coefficient of a corresponding error value variable, the energy balance equation set is solved by using the known error of an error standard device to obtain each single-phase electric energy metering unit, and then the error value of the three-phase electric energy metering device in each load current segment is obtained.
The self-checking method and the self-checking device for the three-phase electric energy metering device have the advantages that: the embodiment of the invention realizes the self-checking of the error of the three-phase electric energy metering device, and overcomes the low checking efficiency caused by the special setting of the testing environment and the arrangement of a specific testing instrument in the prior art. And the problem that the average error result of the electric energy meter calculated in the prior art cannot be used in industrial error value evaluation is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic flow chart of a method for checking errors of a three-phase electric energy metering device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-phase electric energy metering device composed of single-phase electric energy metering units according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an error relationship between single-phase power metering units according to an embodiment of the present invention;
FIG. 4 is an error relationship diagram of an improved single-phase power metering unit provided by the embodiment of the invention;
fig. 5 is a schematic flow chart of power data preprocessing according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an electrical energy data storage relationship provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of an electrical energy data storage relationship provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of an electrical energy data storage relationship provided by an embodiment of the present invention;
fig. 9 is a schematic flow chart of the overall error self-checking calculation of the three-phase electric energy metering device according to the embodiment of the present invention;
fig. 10 is a schematic flow chart of power data preprocessing according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an error checking device for a three-phase electric energy metering device according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of an error checking device for a three-phase electric energy metering device according to an embodiment of the present invention.
Fig. 13 is a schematic flowchart of a method for checking an error of a three-phase electric energy metering device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
In the embodiments of the present invention, when describing that the three-phase electric energy metering device reports the electric energy data, the three-phase electric energy metering device, the electric energy data reported by each single-phase electric energy metering unit and the error standard device, and the electric energy data reported by the three-phase electric energy metering device and the error standard device appear in the embodiments of the present invention, and the common points of the two are that the reported electric energy data includes the electric energy data metered by the three-phase electric energy metering device, the electric energy data metered by each single-phase electric energy metering unit constituting the three-phase electric energy metering device, and the electric energy data metered by the error standard device. The invention also discloses a method for reporting the single-phase electric energy metering units by the three-phase electric energy metering device. The reporting modes can be mutually replaced in the embodiments of the invention.
Example 1:
the embodiment of the invention provides a method for checking errors of a three-phase electric energy metering device, wherein the three-phase electric energy metering device consists of three single-phase electric energy metering units, the single-phase electric energy metering units are used for completing electric energy metering of each phase line, a single-phase electric energy metering device with a known integral error value is connected to any line of the three-phase electric energy metering device to serve as an error standard device, the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device measure electric energy data of the line and report the electric energy data to an error processor to calculate the integral error of the three-phase electric energy metering device according to sectional consideration of load current, the three-phase electric energy metering device and the single-phase electric energy metering unit inside the three-phase electric energy metering device belong to a non-energy-consuming system, the sum of electric energy flowing through the, as shown in fig. 1, the method comprises the steps of:
in step 201, an error standard of the known overall error value is connected in series with any line of the three-phase electric energy metering device.
The error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded to reduce the influence of electromagnetic interference to a preset threshold value, for example: the threshold is one in ten thousandth. The electric energy metering chip and the circuit thereof can be an electronic circuit board for electric energy metering and can also be an electric energy meter, and similarly, the current transformer can also be realized by a current sensor, and the voltage transformer can be realized by a voltage sensor.
Wherein the overall error specifically includes: errors caused by the self metering accuracy of the electric energy metering chip and the circuit thereof, the current transformer and the voltage transformer also comprise the total error caused by other influencing factors; wherein, the sum of errors caused by other influencing factors comprises: the error caused by the influence of the electromagnetic environment of the three parts on the self and the error caused by the mutual interference of the three parts. Theoretically, the total error of the three-phase power metering device is a real value including the total error of the whole three-phase power metering device after the influence of all known and unknown influencing factors. The whole error can only be measured actually in the prior art and cannot be calculated from errors of the electric energy meter and the sensor, and the invention provides a calculation method.
For example, M shown in FIG. 2(a)xI.e. three-phase electric energy metering device of integral error value to be measured, M0Namely an error standard.
In step 202, the three-phase electric energy metering device and the error standard measure and record respective electric energy data according to a preset mode, and report the electric energy data to the error processor.
The data reported by the three-phase electric energy metering device comprises the electric energy sum metered by the three-phase electric energy metering device and the electric energy value metered by each single-phase electric energy metering unit. The power data may include a current data value, a voltage data value, and/or a power value calculated from the current data value and the voltage data value.
In step 203, the error processor calculates an overall error of the three-phase power metering device, which is considered in sections according to the load current, from the received data-processed power data.
The error processor can be a three-phase electric energy metering device, a centralized meter reader, an information collector, a third-party device, equipment or a system inside and outside the system to be tested.
According to the fact that the electric energy data recorded by a three-phase electric energy metering device and a single-phase electric energy metering unit in the system to be tested meet an electric energy conservation principle, the electric energy data recorded by the three-phase electric energy metering device and the electric energy data recorded by the single-phase electric energy metering unit in a specified time are combined with error value variables of the three-phase electric energy metering device and the single-phase electric energy metering unit under the load current segmentation respectively to construct an energy balance equation, and N equations can be formed by reading the electric energy data of the system to be tested for N times to form an equation set, wherein N is a natural number; the energy balance equation set comprises error value variables of each single-phase electric energy metering unit in each load current segment.
The embodiment of the invention realizes the self-checking of the error of the three-phase electric energy metering device, and overcomes the low checking efficiency caused by the special setting of the testing environment and the arrangement of a specific testing instrument in the prior art. And the problem that the average error result of the electric energy meter calculated in the prior art cannot be used in industrial error value evaluation is solved.
In an embodiment of the present invention, in an alternative scheme, the three-phase electric energy metering device component includes: three single-phase electric energy metering units (as M in fig. 2 (a))XShown) for metering the electrical energy on line a, line b and line c, respectively. Each single-phase electric energy metering unit is composed of a metering circuit board and a circuit thereof, a current transformer and a voltage transformer, which can be installed in a shell capable of shielding external electromagnetic interference so as to ensure that the overall error of each single-phase electric energy metering unit cannot be changed due to the change of the place where the metering circuit board and the circuit thereof, the current transformer and the voltage transformer are installed in different shells separately (for example, some products on the market exist, the electric energy meter does not comprise the current transformer and the voltage transformer, and the three are purchased separately and installed together to complete the electric energy metering work, which is common in high-voltage electric environment).
In an alternative of this embodiment, an error standard device of the known overall error value is connected in series to any output line of the three-phase electric energy metering device, as shown in fig. 2(a), and the connection mode specifically includes:
will await measuring three-phase electric energy metering device MXAn error standard device M of the known integral error value is connected in series with the output line of the middle line a0(ii) a Error standard machine M at this time0Metered electric energy value theoretical and three-phase electric energy metering device MxThe electric energy values measured by the single-phase electric energy measuring unit c for completing the electric energy measurement of the line c are the same. In practical connection, the error standard device may be connected in series to the output line of the line a or the output line of the line b, and these series connection modes are all within the protection scope of the present invention.
With reference to the embodiments of the present invention, the preset method specifically includes: setting the three-phase electric energy metering device and the error standard device to record respective electric energy data according to a specified time interval and report the electric energy data to the error processor; or setting the three-phase electric energy metering device and the error standard device to record respective electric energy data according to a specified time interval, and reporting the electric energy data to the error processor after receiving the data reporting request message. The electric energy data recorded by the three-phase electric energy metering device comprises the electric energy sum (namely the total electric energy which can be directly read from the dial plate of the three-phase electric energy metering device) which is metered by the three-phase electric energy metering device, and the electric energy value which is metered by each single-phase electric energy metering unit in the three-phase electric energy metering device for the circuit electricity of the single-phase electric energy metering unit.
In the embodiment of the invention, the parameter with the designated time and period is involved, and the parameter value can be set by a worker. This example presents a preferred parameter scheme, specifically: the specified time is specifically 30 days; the time interval is in particular 30 minutes.
With reference to the embodiment of the present invention, before the performing of the error processor to obtain and store the electric energy data of each metering circuit board and its circuit in the system under test within the specified time, the method further includes:
receiving an error value analysis instruction; the error value analysis instruction is sent by an operator, or the error value analysis instruction is preset by the operator and triggered periodically so that the required error value calculated by the error processor can be obtained.
Example 2:
the overall error is presented in example 1, and a method for solving the overall error of the three-phase electric energy metering device is given by the method provided in example 1. This embodiment 2 is a clear definition around the difference between the overall error and the average error. The metering chip and its circuitry are also referred to in this embodiment as: an electric energy meter.
As shown in fig. 3, which is a schematic diagram of an architecture of a conventional set of electric energy meter, circuit transformer and voltage transformer, as already described in embodiment 1, the three-phase electric energy metering device described in this embodiment includes three sets of single-phase electric energy metering units formed by the electric energy meter, the current transformer and the voltage transformer. In the prior art, both the current transformer and the voltage transformer, usually the electric energy meter, are manufactured by manufacturers as different devices, and errors may exist in all the three in practical application. The errors of the three can be seen independently, the error epsilon of the voltage transformerpt(εpt＝fpt+jδpt) Error e of current transformerct(εct＝fct+jδct) Is a vector error, and the error of the electric energy meter is epsilonmThe error of the three is scalar error, and an error value cannot be obtained through addition and subtraction operation. The industry can only give an estimated range, and it is desirable that the true error not exceed this range, which is known in the art as the composite error. However, this combined error is due to the error ε caused by the environmental effects of the three described in example 1xAnd the error influence caused by mutual interference among the electric energy meter, the current transformer and the voltage transformer is variable and immeasurable.
The inventionThe examples present the concept of an overall error. As shown in fig. 4, the embodiment of the present invention is based on providing an electric energy metering device, in which a current transformer, a voltage transformer and an electric energy meter are integrated together, and the three devices are protected by a housing having a function of shielding electromagnetic interference, so that an external error epsilon formed by environmental influence and influence caused by mutual interference among the three devices exists in the prior artxThe error result for the final calculation is reduced to a sufficiently small range. Furthermore, in the production process, the error of the metering circuit board and the circuit X thereof is checked and compensated, and the function epsilon formed by the error variables of the current transformer, the voltage transformer and the electric energy meterm’＝f(εm,εx,εpt,εct) The reduction in the function value of (c) is sufficiently small. This epsilonmThe value of' is often the overall error value of the power metering device. According to the embodiment of the invention, the credible known error value is provided by using the error standard device of the shell with the electromagnetic interference shielding function, so that the integral error test of the three-phase electric energy metering device becomes possible.
According to the above analysis, in the embodiment of the present invention, there is a preferred three-phase electric energy metering device, and specifically, the metering circuit board and its circuit, the current transformer and the voltage transformer in the to-be-three-phase electric energy metering device are implemented by using the electric energy metering device proposed by the present invention, that is, the three electric energy metering devices are used to form a three-phase electric energy metering device, so as to complete the metering of electric energy on the line a, the line b and the line c as shown in fig. 2 (a).
Example 3:
in example 1, a method for calculating the overall error of each electric energy metering device according to an error standard device connected with a known overall error value and further in combination with electric energy data recorded and reported by a three-phase electric energy metering device in a preset manner is described. To further enable those skilled in the art to understand how to calculate the overall error of each energy metering device according to the received energy data, the present embodiment provides a method of segment preprocessing according to load current, as shown in fig. 5, including:
in step 301, the error processor receives the electric energy data sent by the three-phase electric energy metering device, and performs screening according to the electric energy data to determine the load current segment to which the electric energy data belongs.
In the first mode, the load current segment where the electric energy data is located may be calibrated by the three-phase electric energy metering device when recording the electric energy data of the three-phase electric energy metering device itself. And when the electric energy data is sent to the error processor, the load current segmentation information of the electric energy data is carried in the sent message.
In another mode, the message sent by the three-phase electric energy metering device does not carry load current segment information, that is, the three-phase electric energy metering device only sends electric energy data to the error processor, and the error processor analyzes the load current segment where the electric energy data reported by the error processor is located according to the corresponding metering circuit board and the circuit thereof.
In step 302, the power data is stored in a storage area identified by the three-phase power metering device corresponding to the load current segment.
The corresponding metering circuit board and its circuit, load current segment and corresponding electric energy data in the error processor are stored in fig. 6, wherein the electric energy data stored in each load current segment respectively stores the relevant information of the recording time (in fig. 6, the electric energy data is depicted as a whole block, and the corresponding relation between the electric energy data and the time is not shown). Fig. 7 shows a storage diagram of a format mode combining reporting time and electric energy data storage in the load current segment 1. An example of storing data in a table form is also given in the present embodiment, as shown in fig. 8. The data structure relationships shown in fig. 6, fig. 7 and fig. 8 given in embodiment 2 of the present invention are merely examples, and embodiments of the present invention also protect other forms of storage modes related to the load current segment, the recording time and the power data.
Example 4:
in embodiment 3, how the error processor stores the electric energy data reported by the electric energy meter according to the relationship between the load current segments and the electric energy data is given, and next, embodiment 4 will focus on the fact that the error processor calculates the overall error of the three-phase electric energy metering device according to the received electric energy data in embodiment 1, and give a specific implementation manner in combination with the connection circuit shown in fig. 2 (a). As shown in fig. 9, the method comprises the following steps:
in step 401, according to the fact that the electric energy data recorded by the three-phase electric energy metering device and the single-phase electric energy metering unit meet the principle of electric energy conservation, the electric energy data recorded by the three-phase electric energy metering device and the electric energy data recorded by the single-phase electric energy metering unit within the specified time are combined with error value variables of the three-phase electric energy metering device and the single-phase electric energy metering unit under the load current segmentation respectively to construct an energy balance equation, and the electric energy data of the system to be measured is read for N times to form N equations and form an equation set, wherein N is a natural number; the energy balance equation set comprises error value variables of each single-phase electric energy metering unit in each load current segment.
As shown in FIG. 2(a), the system assumes that the power reading detected by the single-phase power metering unit a of the line a in the measurement period T is(j ═ 1,2, …, m is the jth load current segment)); the electric energy reading obtained by the detection of the single-phase electric energy metering unit b which can obtain the line b in turn isThe single-phase electric energy metering unit c of the line c obtains the electric energy reading asThe total electric energy reading obtained by the three-phase electric energy metering device isxajTo detect the overall error of the power metering device of the line a in the jth current segment, the following holds according to the law of conservation of energy:
error standard machine M0Substituting the recorded parameters into equation (1) yields the following equation:
wherein x is0jThe error of the error standard device with known error in the j current segment is a known constant; w0jIs an error standard device M0And metering the obtained electric energy data.
In step 402, the error processor obtains stored power data for the three-phase power metering device, each single-phase power metering unit, and the error normalizer in the corresponding load current segment. When the number of batches is equal to 3 m, the number of equations in the equation set is equal to the number of integral errors, and the equation set has a unique solution. Thus obtaining the error value of the three-phase electric energy metering device in each load current section. When the error processor stores the data, the method shown in fig. 7 can be referred to, so that the electric energy data stored in the corresponding load current segment by each metering circuit board and the circuit thereof in the specified time can be obtained, and the electric energy conforms to the energy conservation stated in the formula (2).
In step 403, the electric energy data is substituted into an energy balance equation set as a coefficient of a corresponding error value variable according to the corresponding load current segment, and the energy balance equation set is solved by using a known error of an error standard, so as to obtain an error value of each electric energy metering device in each load current segment.
In connection with the present embodiment, assuming that the load current segment includes 1,2 and 3 levels in the present embodiment, i.e. m is 3, the error value x isajWill also appear as three values:
wherein x isa,1Is MaAn error value variable under the 1 st load current segment; x is the number ofa,2And xa,3Are respectively MaAn error value variable at the 2 nd load current segment and the 3 rd load current segment. Since the power data reported by the three-phase power metering device at the same time may include one or more of the 3 load current segments. This may occur in relation to the frequency at which the three-phase power metering device records its own power data and reports power data to the error processor, for example: the three-phase electric energy metering device records the electric energy data once every 10 minutes, and the frequency of reporting the electric energy data is once every 30 minutes, when the error processor receives the electric energy data reported once by one three-phase electric energy metering device, the electric energy data comprises 3 recorded electric energy values, and the 3 recorded electric energy values are likely to correspond to more than one load current segment.
Therefore, the error processor also needs to do a round of screening before applying the stored power data to equations 2) and 3). The screening specifically comprises the steps of analyzing the recording times p reported currently according to the three-phase electric energy metering device and the error standard device and contained in the stored electric energy data; determining the number n of variables of an equation set formed by error value variables, equally dividing the recording times into p and 3 x n groups of parameter values, wherein each group of parameter values comprises p/(3 x n) times of recording values; the p/(3 x n) times of recorded values in each group are accumulated corresponding to the load current which the recorded values belong to in a segmented manner, and the accumulated parameter values are substituted into an equation set to obtain the following equation set
Constructing k sets of parameter values from the screened power data, wherein each set of parameter values includes parameter values corresponding to three load current segments, e.g., [ (z)0,1,0,z0,2,0,z0,3,0),(z0,1,b,z0,2,b,z0,3,b),…,(z0,1,3,z0,2,3,z0,3,3)]Which belongs to one of the 9 sets of parameter values. After substituting into a 1 st order 9-dimensional equation set, the following:
wherein z is1,1,0、z1,2,0And z1,3,0In the electric energy data reported by the electric energy of the error standard device, in every p/(3 x n) times of recorded energy data, the accumulated sum of the electric energy data in the 1 st load current segment, the accumulated sum of the electric energy data in the 2 nd load current segment and the accumulated sum of the electric energy data in the 3 rd load current segment.
Example 5:
embodiment 4 provides a manner in which the error processor acquires the electric energy data stored in the corresponding load current segments by the three-phase electric energy metering device and the single-phase electric energy metering unit, and performs accumulation, and then enters formula 2) to calculate the error value of each energy metering device on each load current segment. As shown in fig. 10, the present embodiment will describe how to complete the accumulation process in combination with specific electrical characteristics, and in the present embodiment, it is the current values recorded by the metering circuit board and its circuit for determining the load current segments.
In step 501, register G is seti(i ═ 1,2,3) for storing the accumulated value of the electric energy amount of the 3 load current segments; a. thei(i ═ 1,2,3) in which A is1＝(1-10％)In，A2＝(10-30％)In，A3＝(30-120％)InIn which InTo gauge the rating of the circuit board and its circuit operation. Measuring a time period TiDivided into a number of sampling time intervals △ ti。
In step 502, at each time interval △ tiAt the end, the effective value of the current I is recorded simultaneouslyjiAnd electric energy meter data △ Wji(where j is a, b, c,3, 0).
In step 503, the current I is determinedjiTo which a belongsiInterval of (2), power data WjiAnd a corresponding register MiThe value of (A) is accumulated and stored in a corresponding register Gi。
In step 504, TiAt the end, the accumulated data W is obtained in each registerjiObtaining the jth single-phase electric energy metering unit at TiPower data of the device
Correspondingly, the electric energy flowing on the jth line can be expressed as
And the integral error of the jth single-phase electric energy metering unit under the ith load current segment is obtained.
In step 505, using the formula
The electric energy metering error of the three-phase electric energy metering device consisting of 3 single-phase electric energy metering units can be calculated, and the acquisition of 9 groups of data is completed if the electric energy metering error needs to be calculated.
This embodiment is more efficient as an alternative to calculating the parameter set in embodiment 4. However, in this embodiment, the received power data needs to be accumulated in real time. Therefore, the error processor is required to clearly define the period of recording the electric energy data, the period of reporting the electric energy data and the period of calculating the overall error value by itself for each metering circuit board and the circuit thereof, so as to effectively distinguish which electric energy data can be accumulated as one set of parameters and which data can be accumulated as another set of parameters (for example, one set described in embodiment 4 is divided into p/9 times of record values).
Example 6:
embodiment 6 of the present invention provides a device 1 for self-checking an error of a three-phase electric energy metering device, as shown in fig. 11, where the device 1 includes a data transceiver unit 10, a storage unit 11, and a processing module 12, specifically:
the data transceiver unit 10 is configured to receive power data reported by a three-phase power metering device, each phase metering circuit board, and circuits thereof, and an error standard in a system to be tested, and send various powers and related data.
The storage unit 11 is used for storing various types of electric energy and related data.
The processing unit 12 is configured to analyze the electric energy data reported by the three-phase electric energy metering device, each single-phase electric energy metering unit, and the error standard, determine a load current segment to which the electric energy data belongs, and store the electric energy data in the storage unit 11 according to a correspondence between an identifier of the three-phase electric energy metering device, an identifier of each single-phase electric energy metering unit, or an identifier of the error standard, and the load current segment and the electric energy data; the processing module 12 is further configured to calculate an overall error of the three-phase electric energy metering device according to the electric energy data.
To further illustrate how the processing unit 12 in this embodiment calculates the overall error of the three-phase electric energy metering device according to the electric energy data, an implementation manner is provided in combination with this embodiment, where the processing unit 12 is further configured to construct an energy balance equation by combining the electric energy data recorded by the three-phase electric energy metering device and the electric energy data recorded by the single-phase electric energy metering device within a specified time with respective error value variables under the load current segment, and read the electric energy data of the system under test N times to form N equations and form an equation set, where N is a natural number; the energy balance equation set comprises error value variables of each single-phase electric energy metering unit in each load current segment; the error processor acquires the stored electric energy data of the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device in the corresponding load current section; and the electric energy data is segmented according to the corresponding load current, substituted into an energy balance equation set to serve as a coefficient of a corresponding error value variable, the energy balance equation set is solved by using the known error of an error standard device to obtain each single-phase electric energy metering unit, and then the error value of the three-phase electric energy metering device in each load current segment is obtained.
The embodiment of the invention realizes the self-checking of the error of the three-phase electric energy metering device, and overcomes the defect that the prior art needs to specially set a test environment and is underground with checking efficiency caused by the arrangement of a specific test instrument. And aiming at the fact that errors of the metering circuit board and the circuit thereof have certain difference in different load current sections, electric energy data meeting calculation conditions are extracted on the basis of the load current sections, and the accuracy of calculating the final error value is improved.
The device for self-checking the error of the three-phase electric energy metering device provided by the embodiment is also used for implementing the methods described in embodiments 1 to 5, and is not repeated herein for the sake of simplifying the requirements of the application document specification.
Example 7:
embodiment 6 shows how the method described in embodiment 1 of the present invention is implemented by the processing unit 12, the data-transceiving unit 10, and the storage device 11. In order to further explain another device to be protected by the present invention in terms of physical products, namely, a metering circuit board with known overall error and its circuit, next, an embodiment of the device (e.g., the standard error machine) based on specific product structure will be given in this embodiment 7. As shown in fig. 12, the standard error unit includes a current sensor, a voltage sensor, a metering chip, a microcontroller, an infrared communication module, an RS485 communication module, a working power supply, a memory, and a liquid crystal display. Wherein the metering chip is called a metering circuit board and a circuit thereof in other embodiments.
And the current sensor and the voltage sensor are used for converting the current and the voltage which are higher than those of the metering circuit board and the circuit thereof into the current and the voltage which can be recorded by the metering circuit board and the circuit thereof. The metering circuit board and the circuit thereof are used for receiving current and voltage signals transmitted by the current sensor and the voltage sensor and calculating to obtain electric energy data.
And the microcontroller is used for connecting the metering circuit board and the circuit thereof and acquiring current values, voltage values and electric energy data in the circuit which is responsible for monitoring from the metering circuit board and the circuit thereof. The microcontroller is also connected with an infrared communication module, a wireless transceiving module and an RS485 communication module, wherein the infrared communication module is used for completing message transceiving with the terminal equipment and transmitting a data acquisition instruction of the terminal equipment to the microcontroller or transmitting data to the terminal equipment. The wireless transceiving module is used for sending electric energy data to an error processor in a network to be tested; and the RS485 communication module is used for completing software upgrading or error detection of the metering circuit board and the circuit thereof. The storage unit is used for storing the current value and the voltage value acquired by the metering chip, and can also store corresponding electric energy data, load current segment related information and the like. The liquid crystal display is used for showing the current power utilization condition, the working state of the metering circuit board and the circuit thereof and the like.
Example 8:
the three-phase electric energy metering device related to the present invention relates to a three-meter method implementation as shown in fig. 2(a), and also relates to a two-meter method implementation as shown in fig. 2 (b). Therefore, this embodiment 8 specifically explains how to calculate the overall error of the three-phase electric energy metering device implemented by the two-meter method as shown in fig. 2 (b). The three-phase electric energy metering device is composed of two single-phase electric energy metering units, the single-phase electric energy metering units are used for completing electric energy metering of each phase circuit, an error standard device with a known integral error value is connected to an output line of the three-phase electric energy metering device, the three-phase electric energy metering device and the error standard device measure electric energy data of a line of the three-phase electric energy metering device and report the electric energy data to an error processor to calculate an integral error of the three-phase electric energy metering device according to sectional consideration of load current, as shown in fig. 13, the method comprises the following steps:
in step 601, the error standard device with the known overall error value is connected to the output line of the three-phase electric energy metering device according to the connection mode of any electric energy metering device in the three-phase electric energy metering device.
The error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded so as to reduce the influence of electromagnetic interference to be within a preset threshold value.
The three-phase electric energy metering device and the single-phase electric energy metering units in the three-phase electric energy metering device form a non-energy consumption system, and the sum of the electric energy flowing through each single-phase electric energy metering unit is equal to the electric energy value metered by the three-phase electric energy metering device.
In step 602, the three-phase electric energy metering device and the error standard measure and record respective electric energy data according to a preset mode, and report the electric energy data to the error processor.
The data reported by the three-phase electric energy metering device comprises the electric energy sum metered by the three-phase electric energy metering device and the electric energy value metered by each single-phase electric energy metering unit.
In step 603, the error processor calculates the overall error of each energy metering device, which is considered in a segmented manner based on the load current, from the received data-processed energy data.
The embodiment of the invention realizes the self-checking of the error of the three-phase electric energy metering device, and overcomes the low checking efficiency caused by the special setting of the testing environment and the arrangement of a specific testing instrument in the prior art. And the problem that the average error result of the electric energy meter calculated in the prior art cannot be used in industrial error value evaluation is solved.
Compared with the embodiment 1, the biggest difference of the embodiment is that the two-meter method is adopted inside the three-phase electric energy metering device, as shown in fig. 2(b), the electric energy metering device 1 inside the three-phase electric energy metering device measures the current on the line a and the voltage between the line a and the line b, and the electric energy metering device 2 measures the current on the line c and the voltage between the line b and the line c. Compared with the mode that three electric energy metering devices are adopted to complete the electric energy metering of the three-phase electric energy metering device in the embodiment 1, the characteristics are the most fundamental differences. The difference in implementation means due to this is mainly reflected in that the connection mode of the standard error unit is greatly different from that in embodiment 1, specifically:
the standard error device needs to be connected to the outgoing line of the three-phase electric energy metering device according to a connection mode of any one of the two electric energy metering devices inside the three-phase electric energy metering device, as shown in fig. 2(b), wherein the standard error device is connected to the outgoing line of the three-phase electric energy metering device by using the same connection mode as that of the electric energy metering device 1.
The specific implementation and extensible implementation of the algorithm related to this embodiment may refer to those in embodiment 1, and are not described herein any more. Due to the fact that only the connection mode is different, the electric energy conservation equation set can be further simplified, and the calculation speed is improved.
It will be further understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, including ROM/RAM, magnetic disk, optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for error calibration of a three-phase electric energy metering device is characterized in that the three-phase electric energy metering device is composed of three single-phase electric energy metering units, the single-phase electric energy metering units are used for completing electric energy metering of each phase line, a single-phase electric energy metering device with a known overall error value is connected to any line of the three-phase electric energy metering device to serve as an error standard device, the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device measure electric energy data of the line and report the electric energy data to an error processor to calculate the overall error of the three-phase electric energy metering device according to sectional consideration of load current, and the method comprises the following steps:
the three-phase electric energy metering device and the single-phase electric energy metering unit in the three-phase electric energy metering device belong to a non-energy-consumption system, and the sum of the electric energy flowing through the single-phase electric energy metering unit is equal to the electric energy value metered by the three-phase electric energy metering device;
an error standard device of the known integral error value is connected in series with any line of the three-phase electric energy metering device; the error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded so as to reduce the influence of electromagnetic interference to a preset threshold value;
the three-phase electric energy metering device and the error standard device measure and record respective electric energy data according to a preset mode, and report the electric energy data to the error processor; the data reported by the three-phase electric energy metering device comprises the electric energy sum metered by the three-phase electric energy metering device and the electric energy value of each single-phase electric energy metering unit;
and the error processor calculates the overall error of the three-phase electric energy metering device according to the load current sectional consideration according to the received electric energy data subjected to data processing.
2. The method according to claim 1, wherein the overall error is a true error of an operating state of a three-phase power metering device, and in the case that the single-phase power metering unit includes a power metering chip and its circuit, a voltage sensor and a current sensor, implementing the overall error specifically includes:
the method comprises the steps of calculating the error sum caused by the self-metering accuracy of an electric energy metering chip and a circuit thereof, a current transformer and a voltage transformer, and the error sum caused by other influencing factors;
wherein, the sum of errors caused by other influencing factors comprises: the error caused by the influence of the electromagnetic environment of the three parts on the self and the error caused by the mutual interference of the three parts.
3. The method according to claim 1, wherein the three-phase electric energy metering device and each single-phase electric energy metering unit measure and record electric energy data of respective lines, and specifically comprises:
determining the load current segment to which the electric energy data belongs according to the measured electric energy data and the load current value;
and searching the position corresponding to the load current segment in the storage area to finish recording and storing.
4. The method of claim 1, wherein the data error handler specifically comprises:
the error processor receives electric energy and related current data of the three-phase electric energy metering device and electric energy and related current data of the error standard device, wherein the electric energy and related current data of the three-phase electric energy metering device comprise electric energy and related current data which are metered by the three-phase electric energy metering device and are metered by each single-phase electric energy metering unit in the three-phase electric energy metering device; determining and classifying the load current segment to which the electric energy data belongs according to the current data;
and storing the electric energy data which are classified and processed according to the load current.
5. The method of claim 1, wherein the data error handler embodies a body comprising: the device comprises a three-phase electric energy metering device for measuring the electric energy data, a single-phase electric energy metering unit, an error standard device or an error calculator.
6. The method of claim 1, wherein the error processor calculates an overall error of the three-phase power metering device based on the load current segment consideration based on the received data-processed power data, and specifically comprises:
according to the fact that the electric energy data recorded by the three-phase electric energy metering device and the single-phase electric energy metering unit meet the principle of electric energy conservation, the electric energy data recorded by the three-phase electric energy metering device and the electric energy data recorded by the single-phase electric energy metering unit in the appointed time are combined with error value variables under the load current segmentation respectively to construct an energy balance equation, N equations can be formed by reading the electric energy data of the system to be tested for N times, and an equation set is formed, wherein N is a natural number; the energy balance equation set comprises error value variables of each single-phase electric energy metering unit in each load current segment;
the error processor acquires the stored electric energy data of the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device in the corresponding load current section;
and the electric energy data is segmented according to the corresponding load current, substituted into an energy balance equation set to serve as a coefficient of a corresponding error value variable, the energy balance equation set is solved by using the known error of an error standard device, the error value of each single-phase electric energy metering unit in each load current segment is obtained, and the electric energy metering error of the three-phase electric energy metering device is further obtained.
7. The method according to claim 1, wherein the presetting mode specifically comprises:
setting the three-phase electric energy metering device and the error standard device to segment according to the specified time and the load current, measuring and recording respective electric energy data, classifying, distinguishing, storing and reporting to the error calculator according to the load current segments; or,
and setting the three-phase electric energy metering device and the error standard device to measure and record respective electric energy data and current data according to specified time, and reporting the electric energy data and the current data to the error processor.
8. A method for checking errors of a three-phase electric energy metering device is characterized in that the three-phase electric energy metering device is composed of two single-phase electric energy metering units, the single-phase electric energy metering units are used for completing electric energy metering of each phase circuit, an error standard device with a known overall error value is connected to any phase circuit of the three-phase electric energy metering device, the three-phase electric energy metering device and the error standard device measure electric energy data of the circuit and report the electric energy data to an error processor to calculate the overall error of the three-phase electric energy metering device according to sectional consideration of load current, and the method comprises the following steps:
the three-phase electric energy metering device and the single-phase electric energy metering units in the three-phase electric energy metering device form a non-energy consumption system, and the sum of the electric energy flowing through each single-phase electric energy metering unit is equal to the electric energy value metered by the three-phase electric energy metering device;
connecting an error standard device with the known integral error value on any phase line of the three-phase electric energy metering device according to the connection mode of any single-phase electric energy metering unit in the three-phase electric energy metering device; the error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded so as to reduce the influence of electromagnetic interference to a preset threshold value;
the three-phase electric energy metering device and the error standard device measure and record respective electric energy data according to a preset mode, and report the electric energy data to the error processor; the data reported by the three-phase electric energy metering device comprises the electric energy sum metered by the three-phase electric energy metering device and the electric energy value metered by each single-phase electric energy metering unit;
the error processor calculates the overall error of each single-phase electric energy metering unit according to the load current sectional consideration according to the received electric energy data subjected to data processing, and further calculates the overall error of the three-phase electric energy metering device.
9. The utility model provides an error processor that is used for check-up error of three-phase electric energy metering device which characterized in that, the error processor includes data transceiver unit, memory cell and processing module's structure, specifically includes:
the data receiving and sending unit is used for receiving electric energy data reported by the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device in the system to be tested, and sending various electric energy and related data;
the storage unit is used for storing various electric energy and related data;
the processing module is used for analyzing the electric energy data reported by the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device, determining the load current segment to which the electric energy data belongs, and storing the electric energy data into the storage unit according to the corresponding relation among the three-phase electric energy metering device identifier, each single-phase electric energy metering unit identifier or the error standard device identifier, the load current segment and the electric energy data; and the processing module is also used for calculating the integral error of the three-phase electric energy metering device according to the electric energy data.
10. The error handler of claim 9, wherein the processing module is further configured to calculate an overall error for each three-phase power metering device based on the power data, further comprising:
the processing module combines the electric energy data recorded by the three-phase electric energy metering device and the electric energy data recorded by the single-phase electric energy metering unit in a specified time with respective error value variables under the load current segmentation to construct an energy balance equation, and N equations can be formed and form an equation set by reading the electric energy data of the system to be tested for N times, wherein N is a natural number; the energy balance equation set comprises error value variables of each single-phase electric energy metering unit in each load current segment;
the error processor acquires the stored electric energy data of the three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device in the corresponding load current section;
and the electric energy data is segmented according to the corresponding load current, substituted into an energy balance equation set to serve as a coefficient of a corresponding error value variable, the energy balance equation set is solved by using the known error of an error standard device to obtain each single-phase electric energy metering unit, and then the error value of the three-phase electric energy metering device in each load current segment is obtained.
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