CN110824409A - Three-phase three-wire electric energy meter wiring mode identification method, electric energy meter and equipment - Google Patents
Three-phase three-wire electric energy meter wiring mode identification method, electric energy meter and equipment Download PDFInfo
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Abstract
The invention provides a method for identifying the wiring mode of a three-phase three-wire electric energy meter, the electric energy meter and equipment, wherein the current wiring mode of the three-phase three-wire electric energy meter is accurately identified according to the collected parameters under the conditions that the A-phase angle, the C-phase angle and the Bit0 of the running state character 7 of the electric energy meter are collected in real time, no disconnection exists between the primary side and the secondary side of a transformer, the voltage transformer is connected in a non-polarity reverse mode, and the secondary voltage wiring and the secondary current wiring are not crossed; according to the invention, the wiring mode of the three-phase three-wire electric energy meter can be directly identified only by acquiring the three parameters in real time and comparing the three parameters with 48 wiring modes set by a program, and the method has the remarkable advantages of rapidness and convenience.
Description
Technical Field
The invention relates to the technical field of electric power systems, in particular to a method for identifying a wiring mode of a three-phase three-wire electric energy meter by adopting a DL/T645-2007 protocol, the electric energy meter and equipment.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The three-phase three-wire electric energy meter is mainly applied to high-voltage users of a power system with 10kV or more and a neutral point ungrounded system, and is arranged on a secondary metering loop through a voltage Transformer (TV) and a current Transformer (TA); for a three-phase three-wire electric energy meter, under the conditions that the primary side and the secondary side of the transformer are not disconnected, the voltage transformer is not connected in a reverse polarity mode, and the secondary voltage connection wire and the secondary current connection wire are not crossed, the combination of the connection modes is totally 48, wherein under the condition that the primary side is the same in load and electricity consumption, some connection modes of the electric energy meter are in a forward metering state, some connection modes of the electric energy meter are in a reverse metering state, and other connection modes of the electric energy meter stop metering; whether forward metering or reverse metering, there are problems with either running fast or slow; only 2 wiring modes can be accurately measured, and only 1 wiring mode is correct wiring.
Based on the characteristic of the three-phase three-wire electric energy meter, some electric power users can achieve the purpose of electricity stealing by manually changing the wiring mode of a secondary metering loop, and the users adopting high-voltage metering are large users, so that the generated electricity stealing amount is considerable; in addition, the wiring error of the electric energy meter is caused by the professional level difference and carelessness of meter installation workers, and the unfairness of electric energy metering is also caused; in view of the situation, the wiring analysis of the three-phase three-wire electric energy meter becomes a necessary examination subject for the electric power department to carry out service training for a long time and even for the technician to check and go on duty, and also becomes a skill competition project of a national power grid; the main content of these business training and assessment competitions generally comprises the following parts: the method comprises the steps of measuring parameters such as voltage, current and phase angle at the tail of the three-phase three-wire electric energy meter, analyzing and judging the wiring mode of the three-phase three-wire electric energy meter by methods such as drawing a phasor diagram, drawing a circuit diagram, writing a 'power expression' of the current wiring mode, substituting the 'average power factor' phi angle value into the 'average power factor' phi angle value, calculating a 'more positive coefficient' value, and calculating a specific 'back-to-supplement electric quantity' value if the 'electric quantity' value recorded during the wrong wiring of the electric energy meter is given. Patent No. CN 103513220A: the patent adopts a phasor diagram method (also called a hexagonal diagram method) of a general teaching material, and the phasor diagram needs to be drawn firstly and then compared with a standard phasor diagram, so that the efficiency is low, and the judgment can be carried out only when certain professional knowledge is required. In addition, currently, the commonly used intelligent three-phase three-wire electric energy meters all adopt the DL/T645-2007 protocol, and the display format for displaying the wiring mode state of the electric energy meter on the LCD liquid crystal display screen is as follows: the voltage has a' UaUc"two fixed position symbols; electric powerFlowed with "IaIcTwo fixed position symbols with a + and a-division; in addition, the combination of the voltage 'reverse phase sequence' marks has 8 display formats, only 4 wiring modes can accurately reflect the actual wiring modes of the electric energy meter, and all the wiring modes of the electric energy meter cannot be comprehensively and accurately displayed.
Therefore, the novel three-phase three-wire electric energy meter adopting the DL/T645-2007 protocol and capable of directly displaying the wiring state of the electric energy meter is invented; or the invention provides a device which can comprehensively replace the manual analysis, judgment and calculation functions of the three-phase three-wire electric energy meter, thereby becoming the problem to be solved in the field.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a method for identifying the wiring mode of a three-phase three-wire electric energy meter, the electric energy meter and equipment, and the method can accurately identify the wiring mode of the three-phase three-wire electric energy meter by reading three parameters of 'A-phase angle', 'C-phase angle' and 'Bit 0' of 'electric meter running state word 7' of the three-phase three-wire electric energy meter and comparing with 48 set wiring modes.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for identifying the wiring mode of a three-phase three-wire electric energy meter;
the method is used for acquiring three parameters of an A-phase angle, a C-phase angle and a Bit0 of an electric meter running state character 7 of the three-phase three-wire electric energy meter in real time and accurately identifying the wiring mode of the three-phase three-wire electric energy meter.
As some possible implementations, the three-phase three-wire electric energy meter is an electric energy meter adopting the DL/T645-2007 specification, or an electric energy meter including three parameter specifications of "Bit 0" of "a-phase angle", "C-phase angle" and "meter operation state word 7" of the three-phase three-wire electric energy meter.
As a further limitation, according to the normal operation condition of the power grid, when the power factor angle of the three-phase three-wire electric energy meter is in the range of 0 ° ± 30 °, the dynamic ranges of the two parameters of the "a-phase angle" and the "C-phase angle" are set, and the state value of "Bit 0" of the "meter operation state word 7" is combined to clarify all 48 connection modes of the three-phase three-wire electric energy meter.
As a further limitation, the values of the phase angle of the phase a, the phase angle of the phase C and the value of the Bit0 of the running state word 7 of the three-phase three-wire electric energy meter are collected in real time and compared with the corresponding set range value, so as to obtain the current wiring mode of the three-phase three-wire electric energy meter.
And as possible implementation modes, pushing the identified current wiring mode of the three-phase three-wire electric energy meter to a display end in real time for displaying.
The invention also discloses a novel three-phase three-wire electric energy meter, which comprises a measuring unit, a data processing unit, a communication unit and a program which is stored in the data processing unit and can run in the data processing unit, and has the functions of electric energy metering, information storage and processing, real-time monitoring, automatic control and information interaction.
Thirdly, the invention discloses a readable storage medium, on which a program is stored, which when executed by a processor implements the method for identifying the wiring manner of the three-phase three-wire electric energy meter according to the invention.
Fourthly, the invention discloses equipment which comprises a processor, a memory, a display, a communication interface and a program which is stored on the memory and can run on the processor, wherein the equipment is connected with the communication interface of the three-phase three-wire electric energy meter, and is used for acquiring the phase angle of the phase A, the phase angle of the phase C and the Bit0 of the running state word 7 of the electric energy meter, and the identification method of the wiring mode of the three-phase three-wire electric energy meter is realized when the processor executes the program.
As some possible implementation manners, the equipment simultaneously displays a power expression corresponding to the current wiring manner, and automatically calculates a correction coefficient value when a required numerical value of an angle phi of an average power factor is input;
as a further limitation, on the basis of calculating the "correction coefficient", when the "electric quantity recorded during wrong wiring of the electric energy meter" value is input, the "back-up electric quantity" value can be calculated.
Compared with the prior art, the invention has the beneficial effects that:
the method only needs to be solidified in a corresponding program, only three groups of parameters of the phase angle A, the phase angle C and the Bit0 of the running state character 7 of the electric meter of the three-phase three-wire electric energy meter need to be collected and compared with 48 set wiring modes, and the wiring mode of the three-phase three-wire electric energy meter can be directly judged.
The program can be loaded in a processor inside the three-phase three-wire electric energy meter, and also can be loaded in an electric energy meter monitoring system, a meter reading system or other equipment to realize the judgment and identification of the wiring mode of the three-phase three-wire electric energy meter.
The judging method has the characteristics of directness, simplicity, convenience in use and the like, so that the wiring analysis of the three-phase three-wire electric energy meter is completely intelligentized, and people are liberated from complex work of field test, analysis and judgment.
The invention solves the problem that the wiring mode can not be comprehensively displayed on the display panel of the three-phase three-wire electric energy meter at present, so that common workers can directly read out the wiring mode of the three-phase three-wire electric energy meter, the power utilization condition of a user is further judged, and the working efficiency can be greatly improved;
the invention can simultaneously display the power expression corresponding to the current wiring mode through the external equipment; by utilizing the man-machine conversation characteristic of the equipment, the problems of subsequent 'correction coefficient' automatic calculation and 'back-up electric quantity' data calculation of the three-phase three-wire electric energy meter in wrong wiring can be solved, and the method has profound practical significance.
Drawings
Fig. 1 is a flowchart of a method for identifying a wiring manner of a three-phase three-wire electric energy meter according to embodiment 1 of the present invention.
Detailed Description
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, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1:
as shown in fig. 1, embodiment 1 of the present invention provides a method for identifying a wiring manner of a three-phase three-wire electric energy meter using a DL/T645-2007 specification, which identifies a current wiring manner of the three-phase three-wire electric energy meter according to collected parameters by collecting three parameters, "a-phase angle", "C-phase angle", and "Bit 0" of an "electric meter operation status word 7" of the three-phase three-wire electric energy meter in real time.
For a three-phase three-wire electric energy meter, under the conditions that the primary side and the secondary side of the transformer are not disconnected, the voltage transformer is not connected in a reverse polarity mode, and the secondary voltage connection wire and the secondary current connection wire are not crossed, the combination of the connection modes of the three-phase three-wire electric energy meter has 48 types, wherein only one type of correct connection mode exists.
The following table shows that 48 connection modes correspond to the three-phase three-wire electric energy meter when the power factor angle phi is 0 degrees +/-30 degrees: the range values of the phase angle of the phase A and the phase angle of the phase C, and the value of the Bit0 of the electric meter operation state word 7.
Table 1: when the power factor angle Φ is 0 ° ± 30 °, 48 corresponding connection modes:
description of the drawings:
(1) during the actual operation of the power grid, the actual load, whether an inductive load or a capacitive load, usually has a power factor angle ranging from Φ to 0 ° ± 30 °, and if a certain time exceeds 30 ° occasionally, the time is at most in minutes, and the exceeding range is limited; in view of the above practical situation, the power factor angle Φ exceeding the range of ± 30 ° can be eliminated as interference so as to avoid influencing the judgment conclusion.
(2) In table 1, only the power expression is:
can be correctly metered, namely: the connection modes of the serial number 1 and the serial number 45 are the correct connection modes, wherein only the connection mode of the serial number 1 is the correct connection mode; other connections determine their operating state, or forward direction, based on their power expression, such as: the connection method of "serial No. 7", etc.; or in reverse, such as: a connection method of "serial No. 4", etc.; or stop, such as: a connection method of "serial No. 5", etc.;
(3) the 'Bit 0' of the 'electric meter running state word 7' is a state word of 'reverse phase sequence of voltage', the phase sequence of the voltage end access of the three-phase three-wire electric energy meter is judged by reading the data, and otherwise, the uniqueness judgment of the wiring mode of the three-phase three-wire electric energy meter cannot be realized. Such as: in the connection method of "serial number 13" and "serial number 28", the range values of "a-phase angle" and "C-phase angle" are the same, and if "Bit 0" of "meter operation state word 7" is not introduced, it cannot be determined.
In this embodiment, a real-time acquisition mode is adopted, the values of the "a-phase angle" and the "C-phase angle" of the current state of the three-phase three-wire electric energy meter and the "Bit 0" of the "electric energy meter running state word 7" are read, and the values are compared with the 48 wiring modes in the table above, so as to obtain the current wiring mode of the three-phase three-wire electric energy meter.
Meanwhile, the current wiring mode of the three-phase three-wire electric energy meter obtained by identification can be displayed in real time.
Example 2:
the embodiment 2 of the invention discloses a novel three-phase three-wire electric energy meter, which comprises a measuring unit, a data processing unit, a communication unit and a program which is stored in the data processing unit and can run in the data processing unit, and has the functions of electric energy metering, information storage and processing, real-time monitoring, automatic control and information interaction, when the data processing unit executes the program, the identification method of the wiring mode of the three-phase three-wire electric energy meter in the embodiment 1 is realized, and the current wiring mode is directly displayed on a display panel of the three-phase three-wire electric energy meter. Specifically, all the "connection modes" listed in table 1 are displayed correspondingly in the display of the novel three-phase three-wire electric energy meter, for example: when the program recognizes the wiring mode of ' serial number 16 ', the display directly displays ' Ub，Uc，Ua”“-Ic”“-Ia"of; when the program recognizes the wiring mode of "serial number 43", the display directly displays "U"c，Ub，Ua"reverse phase sequence" Ia-Ic"is used.
Example 3:
embodiment 3 of the present invention provides a readable storage medium, on which a program is stored, where the program, when executed by a processor, implements the method for identifying the wiring manner of the three-phase three-wire electric energy meter according to embodiment 1 of the present invention.
Example 4:
the embodiment 4 of the present invention provides a device, which includes a processor, a memory, a display, a communication interface, and a program stored in the memory and operable on the processor, wherein the device is connected to the communication interface of the three-phase three-wire electric energy meter, and collects an "a-phase angle", "C-phase angle", and a "Bit 0" of an "electric meter operation status word 7" of the electric energy meter, and the processor implements the method for identifying the wiring mode of the three-phase three-wire electric energy meter described in embodiment 1 when executing the program.
The equipment simultaneously displays a power expression corresponding to the current wiring mode, and automatically calculates a correction coefficient value if a numerical value of an average power factor phi angle required by calculation is input;
furthermore, on the basis of calculating the correction coefficient, when the numerical value of the electric quantity recorded during the wrong wiring of the electric energy meter is input, the value of the compensation electric quantity can be calculated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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.
Claims (10)
1. The method for identifying the wiring mode of the three-phase three-wire electric energy meter is characterized by acquiring an A-phase angle, a C-phase angle and a Bit0 of an electric meter running state character 7 of the three-phase three-wire electric energy meter in real time and identifying the current wiring mode of the three-phase three-wire electric energy meter.
2. The method for identifying the wiring manner of a three-phase three-wire electric energy meter according to claim 1, wherein the three-phase three-wire electric energy meter is a three-phase three-wire electric energy meter adopting a DL/T645-2007 protocol.
3. The method for identifying the wiring manner of the three-phase three-wire electric energy meter according to claim 1, wherein the three-phase three-wire electric energy meter is an electric energy meter comprising three parameter conventions of "a-phase angle", "C-phase angle" of the three-phase three-wire electric energy meter and "Bit 0" of "meter operation status word 7".
4. The method for identifying the wiring modes of the three-phase three-wire electric energy meter according to claim 1, wherein when the power factor angle of the three-phase three-wire electric energy meter is in a range of phi 0 ° ± 30 °, the dynamic ranges of the two parameters of the "phase angle of a phase" and the "phase angle of a phase" of C phase "are set, and all 48 wiring modes of the three-phase three-wire electric energy meter are determined by combining the state value of" Bit0 "of the" meter running state word 7 ".
5. The method for identifying the wiring mode of the three-phase three-wire electric energy meter according to claim 4, wherein the values of the phase angle of the phase A, the phase angle of the phase C and the value of the Bit0 of the running state word 7 of the three-phase three-wire electric energy meter are collected in real time and compared with the corresponding set range values to obtain the current wiring mode of the three-phase three-wire electric energy meter.
6. The method for identifying the wiring mode of the three-phase three-wire electric energy meter according to claim 1, wherein the identified current wiring mode of the three-phase three-wire electric energy meter is pushed to a display terminal in real time for display.
7. An electric energy meter comprising a measuring unit, a data processing unit, a communication unit and a program stored in and operable on the data processing unit, having functions of electric energy metering, information storage and processing, real-time monitoring, automatic control and information interaction, characterized in that the data processing unit, when executing said program, implements the method for identifying the wiring pattern of a three-phase three-wire electric energy meter according to any one of claims 1 to 6 and displays the current wiring pattern directly on the display panel of the three-phase three-wire electric energy meter.
8. A readable storage medium, on which a program is stored, which, when being executed by a processor, implements the method for identifying the wiring pattern of a three-phase three-wire electric energy meter according to any one of claims 1 to 6.
9. An apparatus comprising a processor, a memory, a display and a communication interface, and a program stored on the memory and operable on the processor, wherein the apparatus is connected to the communication interface of a three-phase three-wire electric energy meter, collects "a-phase angle", "C-phase angle" of the electric energy meter and "Bit 0" of "meter operation status word 7" of the electric energy meter, and the processor implements the method for identifying the wiring pattern of the three-phase three-wire electric energy meter according to any one of claims 1 to 6 when executing the program.
10. The apparatus of claim 9, wherein the apparatus simultaneously displays a "power expression" corresponding to a current connection mode, and automatically calculates a "correction coefficient" value if a required value of an "average power factor" Φ angle is input;
furthermore, on the basis of calculating the correction coefficient, when the numerical value of the electric quantity recorded during the wrong wiring of the electric energy meter is input, the value of the compensation electric quantity can be calculated.
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| CN111537772A (en) * | 2020-05-19 | 2020-08-14 | 广东电网有限责任公司东莞供电局 | Electricity larceny prevention and false wiring prevention electric energy meter and electricity larceny prevention and false wiring prevention method |
| CN113419206A (en) * | 2021-05-27 | 2021-09-21 | 国网山东省电力公司青岛供电公司 | Three-phase three-wire electric energy meter wiring judgment method, electric energy meter and equipment |
| CN113484804A (en) * | 2021-06-02 | 2021-10-08 | 青岛鼎信通讯股份有限公司 | Wrong wiring identification method applied to feeder line terminal device |
| CN113985342A (en) * | 2021-10-29 | 2022-01-28 | 广东电网有限责任公司 | Electricity utilization inspection method and device for metering equipment |
| CN116699235A (en) * | 2023-08-08 | 2023-09-05 | 安徽融兆智能有限公司 | Three-phase three-wire electric energy meter with abnormality detection function |
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| CN111537772A (en) * | 2020-05-19 | 2020-08-14 | 广东电网有限责任公司东莞供电局 | Electricity larceny prevention and false wiring prevention electric energy meter and electricity larceny prevention and false wiring prevention method |
| CN113419206A (en) * | 2021-05-27 | 2021-09-21 | 国网山东省电力公司青岛供电公司 | Three-phase three-wire electric energy meter wiring judgment method, electric energy meter and equipment |
| CN113484804A (en) * | 2021-06-02 | 2021-10-08 | 青岛鼎信通讯股份有限公司 | Wrong wiring identification method applied to feeder line terminal device |
| CN113484804B (en) * | 2021-06-02 | 2023-06-20 | 青岛鼎信通讯股份有限公司 | Wrong wiring identification method applied to feeder terminal device |
| CN113985342A (en) * | 2021-10-29 | 2022-01-28 | 广东电网有限责任公司 | Electricity utilization inspection method and device for metering equipment |
| CN116699235A (en) * | 2023-08-08 | 2023-09-05 | 安徽融兆智能有限公司 | Three-phase three-wire electric energy meter with abnormality detection function |
| CN116699235B (en) * | 2023-08-08 | 2023-11-07 | 安徽融兆智能有限公司 | Three-phase three-wire electric energy meter with abnormality detection function |
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