CN113419206A - Three-phase three-wire electric energy meter wiring judgment method, electric energy meter and equipment - Google Patents
Three-phase three-wire electric energy meter wiring judgment method, electric energy meter and equipment Download PDFInfo
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- CN113419206A CN113419206A CN202110584140.8A CN202110584140A CN113419206A CN 113419206 A CN113419206 A CN 113419206A CN 202110584140 A CN202110584140 A CN 202110584140A CN 113419206 A CN113419206 A CN 113419206A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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Abstract
The invention discloses a method for judging the wiring of a three-phase three-wire electric energy meter, the electric energy meter and equipment, comprising the following steps: and obtaining the state word of the wiring mode of the electric energy meter according to the comparison result of the three-phase voltage and the neutral point voltage, the input directions of the phase A current and the phase C current and the Bit0 and Bit1 of the running state word 7 of the electric energy meter, so as to judge the current wiring mode of the electric energy meter. Based on the existing DI-T-645-2007 multifunctional electric energy meter communication protocol, the online judgment is realized by acquiring the state words of the electric energy meter wiring mode corresponding to the electric energy meter wiring mode, one-by-one comparison is not needed, the problems of large calculation amount and long operation time are solved, and the judgment efficiency is improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method for judging wiring of a three-phase three-wire electric energy meter, the electric energy meter and equipment.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The current traditional method for analyzing the wrong wiring of the three-phase three-wire electric energy meter usually carries out field measurement by using instruments such as a universal meter, a calibrator and the like, and compares and analyzes the measured data such as voltage, current, phase angle and the like in a manner of drawing a phasor diagram to obtain the wrong wiring condition of the three-phase three-wire electric energy meter. However, the traditional analysis method needs workers to go to the site and equip corresponding measuring instruments, and has good professional quality of measurement, and the method has the advantages of low wrong wiring distinguishing speed, low accuracy and large consumption of manpower and material resources; meanwhile, the method can only carry out manual individual detection on some obvious metering error meters, and is difficult to find and judge the wrong wiring condition of more meters or less meters which is difficult to find.
In recent years, with the rapid development and wide popularization of multifunctional electronic electric energy meters and communication technologies, wrong wiring analysis by remotely acquiring electric energy meter data is carried out, but the method does not consider the limitation that a three-phase three-wire electric energy meter does not acquire neutral point voltage, can not directly judge a B-phase voltage connection wire by comparing with the neutral point voltage, and can not comprehensively analyze the wiring conditions of all three-phase three-wire electric energy meters; and in addition, part of methods compare and analyze the acquired data with 48 preset wiring methods one by one, so that the judgment of large calculation amount and long calculation time is realized.
Disclosure of Invention
In order to solve the problems, the invention provides a method, an electric energy meter and equipment for judging the wiring of a three-phase three-wire electric energy meter, which are used for realizing on-line judgment by acquiring the state words of the wiring mode of the electric energy meter corresponding to the wiring mode of the electric energy meter based on the existing DI-T-645-2007 multifunctional electric energy meter communication protocol without comparing one by one, solving the problems of large computation amount and long operation time and improving the judgment efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for determining the wiring of a three-phase three-wire electric energy meter, including:
and obtaining the state word of the wiring mode of the electric energy meter according to the comparison result of the three-phase voltage and the neutral point voltage, the input directions of the phase A current and the phase C current and the Bit0 and Bit1 of the running state word 7 of the electric energy meter, so as to judge the current wiring mode of the electric energy meter.
In a second aspect, the present invention provides an electric energy meter comprising: the system comprises a data acquisition unit, a data processing unit and a computer instruction which is stored in the data processing unit and runs on the data processing unit;
the data acquisition unit is used for acquiring three-phase voltage, neutral point voltage, A-phase current and C-phase current;
the data processing unit is configured to implement the method for determining the wiring of the three-phase three-wire electric energy meter according to the first aspect when executing the computer instruction, so as to obtain the current wiring manner of the electric energy meter.
In a third aspect, the present invention provides a computer readable storage medium for storing computer instructions which, when executed by a processor, perform the method of the first aspect.
In a fourth aspect, the present invention provides an electronic device comprising a memory, a processor, a communication interface for connecting an electric energy meter to collect three-phase voltage, neutral point voltage, a-phase current and C-phase current of the electric energy meter, and computer instructions stored in the memory and executed on the processor, wherein the computer instructions, when executed by the processor, implement the method of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
the invention obtains the state word of the wiring mode of the electric energy meter which is uniquely corresponding to the wiring mode of the electric energy meter by calling four groups of data collected by the electric energy meter, and directly outputs the wiring condition of the 1-7 interfaces of the electric energy meter, thereby avoiding the defect of carrying out one-by-one comparative analysis on the collected data and 48 preset wiring methods, and correcting the wrong wiring of the electric energy meter by the output wiring mode even if a worker lacks professional knowledge related to the wrong wiring analysis of the electric energy meter and finds out the wrong wiring alarm of the electric energy meter in daily inspection work, thereby improving the accuracy and the correction efficiency of the wrong wiring analysis.
The invention realizes the analysis and judgment of the wrong wiring of the three-phase three-wire electric energy meter on the line, saves manpower and material resources through field measurement, simultaneously inserts the neutral line into the three-phase three-wire electric energy meter, measures the neutral point voltage, effectively judges the B-phase wiring, realizes the comprehensive coverage analysis of all the wiring conditions of the three-phase three-wire electric energy meter, avoids the field manual wrong wiring judgment by means of an auxiliary measuring instrument, and avoids the metering misalignment caused by the wrong wiring.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a corresponding schematic diagram of an electric energy meter wiring mode status word in the three-phase three-wire electric energy meter wiring judgment provided in embodiment 1 of the present invention.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
The embodiment provides a three-phase three-wire electric energy meter wiring judgment method, which is based on the existing DI-T-645 and 2007 multifunctional electric energy meter communication protocol, only utilizes collected data to perform online judgment, does not need to compare with 48 preset wiring methods one by one, solves the problems of large judgment calculation amount and long operation time, and improves judgment efficiency. The method specifically comprises the following steps: and obtaining the state word of the wiring mode of the electric energy meter according to the comparison result of the three-phase voltage and the neutral point voltage, the input directions of the phase A current and the phase C current and the Bit0 and Bit1 of the running state word 7 of the electric energy meter, so as to judge the current wiring mode of the electric energy meter.
Based on the analysis of the prior art, the main reason influencing the wrong connection judgment efficiency of the on-line three-phase three-wire electric energy meter is that the three-phase three-wire electric energy meter does not measure the neutral point voltage and cannot directly judge the connection of the B phase through the on-line method, so that the neutral line is connected into the three-phase three-wire electric energy meter in the embodiment, and the collected three-phase voltage and the neutral point voltage and the corresponding data identification DI thereof are used for identifying the neutral line3DI2DI1DI0And measuring, collecting and transmitting the neutral point voltage.
As shown in fig. 1, the method for acquiring the status word of the connection mode of the electric energy meter specifically includes:
since the Bit0 of the electric meter operation status word 7 is a status word of a voltage reverse phase sequence, in this embodiment, the highest Bit6 in the electric energy meter connection mode status word is obtained by determining the voltage positive and reverse phase sequences according to the lowest Bit0 of the calling electric meter operation status word 7; the method specifically comprises the following steps:
calling the meter running status word 7 with data identification DI3DI2DI1DI0(04000507) the lowest Bit0, if the voltage is in the reverse phase sequence, the input of the highest Bit6 of the electric energy meter wiring mode status word is 1; if the voltage is in a positive phase sequence, the input of the highest Bit6 of the electric energy meter wiring mode status word is 0.
In the embodiment, the current positive and negative phase sequence is judged according to the Bit1 of the calling electric meter running state word 7, and the Bit2 in the electric energy meter wiring mode state word is obtained; the method specifically comprises the following steps:
calling the meter running status word 7 with data identification DI3DI2DI1DI0(04000507) if the current is in the reverse phase sequence, the input of a wiring mode status Bit2 of the electric energy meter is 1 in the lowest Bit 1; if the current is in the positive phase sequence, the input of the electric energy meter wiring mode status word Bit2 is 0.
In the embodiment, a neutral line is connected into a three-phase three-wire electric energy meter, and a B-phase connection line is judged according to a voltage value comparison result of the obtained three-phase voltage and a neutral point voltage, so that Bit5, Bit4 and Bit3 of an electric energy meter connection mode status word are obtained; the method specifically comprises the following steps:
an A-phase voltage is acquired with data labeled DI3DI2DI1DI0(02010100)；
B-phase voltage is obtained, and data of the B-phase voltage is marked as DI3DI2DI1DI0(02010200)；
The C-phase voltage is obtained, and the data thereof is marked as DI3DI2DI1DI0(02010300)；
Acquiring a neutral point voltage with data labeled DI3DI2DI1DI0(0201FF00)；
Comparing the A, B, C phase voltage with the neutral point voltage respectively, and outputting 1 when the voltage values are equal and 0 when the voltage values are unequal, wherein the comparison results respectively correspond to Bit5, Bit4 and Bit3 of the wiring mode status words of the electric energy meter.
In the embodiment, current wiring is judged according to the input directions of the phase current A and the phase current C to obtain Bit1 and Bit0 of the electric energy meter wiring mode status word; the method specifically comprises the following steps:
phase A current is acquired with data labeled DI3DI2DI1DI0(02020100)；
Obtaining C-phase current with data labeled DI3DI2DI1DI0(02020300)；
And judging the current direction according to the highest position of the phase current A and the phase current C, wherein the judgment results respectively correspond to Bit1 and Bit0 of the wiring mode status word of the electric energy meter, the highest position of the current represents the current input direction, the positive direction is 0, and the negative direction is 1.
In this embodiment, a binary number of 7 bits is obtained through the above calculation process, that is, a status word of the electric energy meter in the wire connection mode, and the data identifier is DI3DI2DI1DI0(040005FF), the wiring mode of the electric energy meter can be rapidly judged by reading the state word of the wiring mode of the electric energy meter, the state word of the wiring mode of the electric energy meter is uniquely corresponding to the wiring mode of the current electric energy meter, the wiring condition of the 1-7 interfaces of the electric energy meter is directly output, and the wrong wiring can be alarmed.
In the following table, table 1 indicates the status words of the connection modes of the electric energy meter, and table 2 indicates the connection modes of the electric energy meter corresponding to the status words of the connection modes of the electric energy meter:
table 1 shows the meaning of status words of the wiring mode of the electric energy meter
The electric energy meter 2 is the wiring mode of the electric energy meter corresponding to the state word of the wiring mode of the electric energy meter
Example 2
The present embodiment provides an electric energy meter, including: the system comprises a data acquisition unit, a data processing unit and a computer instruction which is stored in the data processing unit and runs on the data processing unit;
the data acquisition unit is used for acquiring three-phase voltage, neutral point voltage, A-phase current and C-phase current;
the data processing unit is configured to implement the method for determining the wiring of the three-phase three-wire electric energy meter according to the first aspect when executing the computer instruction, so as to obtain the current wiring manner of the electric energy meter.
The electric energy meter also comprises a display unit for displaying the obtained current wiring mode of the electric energy meter in real time;
the electric energy meter also comprises an alarm unit for alarming the wrong wiring of the current wiring mode of the electric energy meter.
It should be noted that the modules correspond to the steps in embodiment 1, and the modules are the same as the corresponding steps in the implementation example and application scenarios, but are not limited to the disclosure in embodiment 1.
In further embodiments, there is also provided:
a computer readable storage medium storing computer instructions which, when executed by a processor, perform the method of embodiment 1. For brevity, no further description is provided herein.
An electronic device comprising a memory, a processor, a communication interface for connecting an electric energy meter to collect three-phase voltages, a neutral point voltage, a-phase current and a C-phase current of the electric energy meter, and computer instructions stored on the memory and executed on the processor, the computer instructions when executed by the processor, performing the method of embodiment 1. For brevity, no further description is provided herein.
It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate arrays FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include both read-only memory and random access memory, and may provide instructions and data to the processor, and a portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information.
It should be understood that the method in embodiment 1 may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, among other storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.
Those of ordinary skill in the art will appreciate that the various illustrative elements, i.e., algorithm steps, described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A three-phase three-wire electric energy meter wiring judgment method is characterized by comprising the following steps:
and obtaining the state word of the wiring mode of the electric energy meter according to the comparison result of the three-phase voltage and the neutral point voltage, the input directions of the phase A current and the phase C current and the Bit0 and Bit1 of the running state word 7 of the electric energy meter, so as to judge the current wiring mode of the electric energy meter.
2. The method as claimed in claim 1, wherein the method comprises determining the positive and negative phase sequence of the voltage according to the lowest Bit0 of the calling meter operation status word 7 to obtain the highest Bit6 of the electric energy meter connection mode status word; the method specifically comprises the following steps: if the voltage is in the reverse phase sequence, the highest Bit6 of the status word in the wiring mode of the electric energy meter outputs 1; if the voltage is in a positive phase sequence, the highest Bit6 of the electric energy meter wiring mode status word is output as 0.
3. The method as claimed in claim 1, wherein the method for determining the wiring of the three-phase three-wire electric energy meter comprises determining the positive and negative phase sequence of the current according to the Bit1 of the calling electric energy meter operation status word 7 to obtain the Bit2 of the electric energy meter wiring mode status word; the method specifically comprises the following steps: if the current is in the reverse phase sequence, the state word Bit2 in the wiring mode of the electric energy meter outputs 1; if the current is in the positive phase sequence, the output of the electric energy meter wiring mode status word Bit2 is 0.
4. The method for determining the wiring of a three-phase three-wire electric energy meter according to claim 1, wherein the wiring of the B phase is determined according to the comparison result of the voltage values of the obtained three-phase voltage and the neutral point voltage, and Bit5, Bit4 and Bit3 of the state words of the wiring mode of the electric energy meter are obtained; the method specifically comprises the following steps: the voltages of the phase A, the phase B and the phase C are respectively compared with the voltage of a neutral point, the comparison results respectively correspond to Bit5, Bit4 and Bit3 of the wiring mode status words of the electric energy meter, the output is 1 when the voltage values are equal, and the output is 0 when the voltage values are unequal.
5. The method for determining the wiring of a three-phase three-wire electric energy meter according to claim 1, wherein the current wiring is determined according to the input directions of the phase-A current and the phase-C current, and Bit1 and Bit0 of the state words of the wiring mode of the electric energy meter are obtained; the method specifically comprises the following steps: and judging the current direction according to the highest position of the phase current A and the phase current C, wherein the judgment results respectively correspond to Bit1 and Bit0 of the wiring mode status word of the electric energy meter, the highest position of the current represents the current input direction, the positive output is 0, and the negative output is 1.
6. The method as claimed in claim 1, wherein the electric energy meter is a three-phase three-wire electric energy meter using the DI-T-645-2007 convention.
7. The method for distinguishing the wiring of a three-phase three-wire electric energy meter according to claim 6, wherein a neutral line is connected to the three-phase three-wire electric energy meter to obtain a neutral point voltage.
8. An electric energy meter, comprising: the system comprises a data acquisition unit, a data processing unit and a computer instruction which is stored in the data processing unit and runs on the data processing unit;
the data acquisition unit is used for acquiring three-phase voltage, neutral point voltage, A-phase current and C-phase current;
the data processing unit is used for realizing the method for judging the wiring of the three-phase three-wire electric energy meter according to any one of claims 1 to 7 when the computer instructions are executed, so as to obtain the current wiring mode of the electric energy meter.
9. A computer-readable storage medium storing computer instructions which, when executed by a processor, perform the method of any one of claims 1 to 7.
10. An electronic device comprising a memory, a processor, a communication interface for connecting an electric energy meter to collect three-phase voltages, a neutral point voltage, a-phase current and a C-phase current of the electric energy meter, and computer instructions stored on the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the method of any one of claims 1-7.
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