A method and apparatus for identifying the wiring state of an electricity metering device

Abstract

This invention provides a method and apparatus for identifying the wiring status of an electricity metering device, comprising: identifying whether the target electricity metering device is a low-voltage three-phase meter based on the device parameters; when the target electricity metering device is identified as a low-voltage three-phase meter, extracting daily current and energy consumption data obtained from the metering master station for the target electricity metering device within a preset time period; determining whether the maximum current value on the primary side of any phase of the target electricity metering device is greater than a preset first current threshold based on the daily current and energy consumption data; determining whether the minimum current value is less than or equal to a preset second current threshold and whether the number of times the current value is less than 0 is greater than or equal to a preset number of times threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number of times threshold, then determining that the wiring status of that phase is reversed. This invention has high accuracy, simple method, and strong operability.

Description

Technical Field

[0001] This invention relates to the field of electrical energy metering device technology, and in particular to a method and apparatus for identifying the wiring status of electrical energy metering devices. Background Technology

[0002] Accurate metering of electricity is crucial to the economic interests of both power companies and users. When the incoming and outgoing lines of the three phases (A, B, and C) of a low-voltage three-phase meter are all reversed, the user's electricity consumption is recorded as reverse active power. Currently, the electricity industry uses a billing model based on the meter's forward active power. This reverse active power consumption is not promptly settled (it can be added later if discovered), and in some cases, it goes undetected even until the meter is replaced. This represents an economic loss for the power supply company.

[0003] Currently, in the power industry, the identification of reversed connection of under-rated three-phase meters is mainly based on whether the meter current is negative. Since the installation point of a photovoltaic (PV) power generator is both the line supplying load to and from the power grid, when the power generation of each of the three phases (A, B, and C) exceeds the power consumption, all three phases (A, B, and C) supply load to the power grid, resulting in negative current values ​​for all three phases. In this case, using negative current to determine if a single-phase meter is reversed can easily lead to misjudgment, resulting in incorrect on-site verification work orders and wasted manpower and resources. Furthermore, due to limitations in terminal transmission capacity, the current of a significant number of under-rated three-phase meters cannot be collected; therefore, it is impossible to determine the correctness of the wiring simply by checking if the meter current is negative. In large and medium-sized cities, there are over a million single-phase meters. Due to a shortage of manpower, it is difficult to manually check each meter for reversed connections. Therefore, when reversed connections are discovered in under-counted three-phase meters, the amount of electricity missed has often reached tens of thousands to hundreds of thousands of kilowatt-hours, which brings a huge workload to the subsequent electricity recovery work. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for identifying the wiring status of an electricity metering device, and to solve the technical problem of how to determine whether a three-phase meter is connected in reverse by observing the positive and negative values ​​of the current.

[0005] On the one hand, a method for identifying the wiring status of an electricity metering device is provided, comprising:

[0006] Obtain the equipment parameters of the target electricity metering device, and identify whether the target electricity metering device is a low-voltage three-phase meter based on the equipment parameters;

[0007] When the target energy metering device is identified as a low-voltage three-phase meter, the daily current and energy consumption data obtained by the target energy metering device from the metering master station within a preset time period are extracted; and it is determined whether the daily current and energy consumption data is empty, and whether the user type corresponding to the target energy metering device is a photovoltaic power generation customer or a local power plant customer.

[0008] When the daily current data is not empty and the user type corresponding to the target energy metering device is not a photovoltaic power generation customer or a local power plant user, the maximum current value of any phase primary side of the target energy metering device is determined according to the daily current data to see if it is greater than the preset first current threshold.

[0009] When the maximum current value on the primary side of the phase in the target energy metering device is not greater than a preset first current threshold, the minimum current value on the primary side of the phase in the target energy metering device is determined to be less than or equal to a preset second current threshold based on the daily current consumption data, and the number of times the current value is less than 0 is determined to be greater than or equal to a preset number threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then the phase wiring state is determined to be reversed;

[0010] When the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold, it is determined whether the verification of all phases in the target energy metering device has been completed; if the verification of all phases in the target energy metering device has been completed, it is determined whether all phases in the target energy metering device are connected in reverse; if all phases in the target energy metering device are connected in reverse, it is determined that the target energy metering device is connected in reverse.

[0011] Wherein, the first current threshold is a positive number, and the second current threshold is a negative number.

[0012] Preferably, determining whether the daily electricity consumption data is empty includes:

[0013] Determine whether the number of times the current in the daily electricity consumption data of the target electricity metering device is not equal to 0 is greater than a preset threshold for the number of times it is not empty;

[0014] If the number of times the current in the daily electricity consumption data is not equal to 0 is greater than the preset threshold for the number of times it is not empty, then the daily electricity consumption data is determined to be not empty.

[0015] If the number of times the current is not equal to 0 in the daily current energy data is not greater than the preset threshold for the number of times it is not empty, then the daily current energy data is determined to be empty.

[0016] Preferably, it further includes:

[0017] The identification process ends when the daily electricity consumption data is determined to be empty.

[0018] Preferably, it further includes:

[0019] The identification process ends when it is determined that the user type corresponding to the target electricity metering device is a photovoltaic power generation customer or a local power plant customer.

[0020] Preferably, it further includes:

[0021] The identification process ends when the maximum current value on the primary side of the target energy metering device exceeds a preset first current threshold.

[0022] Preferably, it further includes:

[0023] The identification process ends when all phases in the target energy metering device are not reversed.

[0024] Preferably, it further includes:

[0025] If the verification of all phases in the target energy metering device is not completed, then the maximum current value of the primary side of another phase in the target energy metering device is determined based on the daily current data to see if it is greater than a preset first current threshold.

[0026] Preferably, it further includes:

[0027] When the maximum current value on the primary side of the phase in the target energy metering device is not greater than a preset first current threshold, the minimum current value on the primary side of the phase in the target energy metering device is determined to be less than or equal to a preset second current threshold based on the daily current consumption data, and the number of times the current value is less than 0 is determined to be greater than or equal to a preset number threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then the phase wiring state is determined to be reversed.

[0028] Preferably, it further includes:

[0029] When the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold, it is determined whether the verification of all phases in the target energy metering device has been completed, until the verification of all phases in the target energy metering device has been completed.

[0030] On the other hand, an apparatus for identifying the wiring status of an electricity metering device is also provided, which implements the method for identifying the wiring status of an electricity metering device, comprising:

[0031] The metering device identification module is used to acquire the equipment parameters of the target energy metering device and identify whether the target energy metering device is a low-voltage three-phase meter based on the equipment parameters.

[0032] The first judgment module is used to extract the daily current and electricity consumption data obtained by the target electricity metering device from the metering master station within a preset time period when the target electricity metering device is identified as a low-voltage three-phase meter; and to determine whether the daily current and electricity consumption data is empty, and whether the user type corresponding to the target electricity metering device is a photovoltaic power generation customer or a local power plant customer.

[0033] The second judgment module is used to determine whether the maximum current value of any phase primary side of the target energy metering device is greater than a preset first current threshold when the daily current data is not empty and the user type corresponding to the target energy metering device is not a photovoltaic power generation customer or a local power plant user.

[0034] The third judgment module is used to determine, based on the daily electricity consumption data, whether the minimum current value of the primary side of the phase in the target electricity metering device is less than or equal to a preset second current threshold, and whether the number of times the current value is less than 0 is greater than or equal to a preset number threshold when the maximum current value of the primary side of the phase in the target electricity metering device is not greater than a preset first current threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then the wiring status of the phase is determined to be reversed.

[0035] The fourth judgment module is used to determine whether the verification of all phases in the target energy metering device has been completed when the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold; if the verification of all phases in the target energy metering device has been completed, then it is determined whether all phases in the target energy metering device are reversed; if all phases in the target energy metering device are reversed, it is determined that the target energy metering device is reversed.

[0036] Wherein, the first current threshold is a positive number, and the second current threshold is a negative number.

[0037] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0038] The method and apparatus provided by this invention for identifying the wiring status of electricity metering devices utilize current data not limited to a specific point in time, but rather all current values ​​obtainable by the meter within the past 10 days. Furthermore, the number of times the current values ​​for all three phases (A, B, and C) are not zero is at least five times. This ensures that the current data represents a time period rather than a single point in time, providing a basis for longitudinal observation and comparative analysis. Additionally, it incorporates a comprehensive analysis to determine whether the user is a "photovoltaic power generation customer" or a "local power plant customer," solving the problem of accurately identifying whether low-phase meters are connected incorrectly based solely on current positive or negative values. The method boasts high accuracy, simplicity, and ease of operation. While contributing to energy conservation and efficiency for power companies and generating significant economic benefits, it also effectively improves the daily operation and management levels and line loss management capabilities of power companies. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0040] Figure 1 This is a schematic diagram of the main flow of a method for identifying the wiring status of an electricity metering device in an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of a device for identifying the wiring status of an electricity metering device according to an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] like Figure 1 The diagram shown is a schematic representation of an embodiment of a method for identifying the wiring status of an electricity metering device provided by the present invention. In this embodiment, the method includes the following steps:

[0044] Step S1: Obtain the equipment parameters of the target energy metering device, and identify whether the target energy metering device is a low-voltage three-phase meter based on the equipment parameters; that is, extract the meter type of the low-voltage three-phase meter. Extracting the meter type is a conventional setting in this field and will not be described in detail here.

[0045] Step S2: When the target energy metering device is identified as a low-voltage three-phase meter, extract the daily current and electricity data obtained by the target energy metering device from the metering master station within a preset time period (set to 10 days in this embodiment); and determine whether the daily current and electricity data is empty, and determine whether the user type corresponding to the target energy metering device is a photovoltaic power generation customer or a local power plant customer; that is, extract the current and daily electricity data obtained by the low-voltage three-phase meter from the metering master station in the most recent 10 days, and remove those that are empty, specifically determine whether the number of times the meter can obtain current that is not equal to 0 is greater than 5.

[0046] In a specific embodiment, determining whether the daily electricity consumption data is empty includes:

[0047] The system determines whether the number of times the current is not equal to 0 in the daily current consumption data of the target electricity metering device is greater than a preset threshold for the number of non-empty times (set to 5 in this embodiment); if the number of times the current is not equal to 0 in the daily current consumption data is greater than the preset threshold for the number of non-empty times, then the daily current consumption data is determined to be non-empty; if the number of times the current is not equal to 0 in the daily current consumption data is not greater than the preset threshold for the number of non-empty times, then the daily current consumption data is determined to be empty.

[0048] Step S3: When the daily current consumption data is not empty and the user type corresponding to the target energy metering device is not a photovoltaic power generation customer or a local power plant user, determine whether the maximum current value of any phase primary side of the target energy metering device is greater than a preset first current threshold based on the daily current consumption data; that is, the meter is a meter whose user category is "photovoltaic power generation customer" or "local power plant user"; if yes, the identification process ends; if no, proceed to the next step.

[0049] In a specific embodiment, the identification process ends when the daily electricity consumption data is determined to be empty. The identification process also ends when the user type corresponding to the target electricity metering device is determined to be a photovoltaic power generation customer or a local power plant user.

[0050] Step S4: When the maximum current value of the primary side of the target energy metering device is not greater than the preset first current threshold, determine whether the minimum current value of the primary side of the target energy metering device is less than or equal to the preset second current threshold based on the daily current consumption data, and determine whether the number of times the current value is less than 0 is greater than or equal to the preset number threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then determine that the phase wiring status is reversed; in this embodiment, the first current threshold is a positive number and the second current threshold is a negative number, that is, determine whether the maximum current value of the primary side of phase A (phase B, phase C) is greater than 3A in these 10 days. If yes, the identification process ends; if no, continue to determine whether the minimum current value of the primary side of phase A (phase B, phase C) is less than or equal to -3A (or -1A if the multiplier is 1) in these 10 days, and whether the number of times the primary side current is less than 0 is greater than or equal to 3. If yes, phase A (phase B, phase C) is "reverse polarity"; if no, proceed to the next step.

[0051] In a specific embodiment, the identification process ends when the maximum current value on the primary side of a phase in the target energy metering device exceeds a preset first current threshold. The identification process also ends when all phases in the target energy metering device are not reversed.

[0052] Step S5: When the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold, determine whether the verification of all phases in the target energy metering device has been completed; if the verification of all phases in the target energy metering device has been completed, determine whether all phases in the target energy metering device are reversed; if all phases in the target energy metering device are reversed, determine that the target energy metering device is reversed; that is, whether the reverse polarity verification of phases A, B, and C has been completed, if yes, proceed to the next step; if no, repeat the judgment process for each phase until the verification of all phases in the target energy metering device has been completed; whether phases A, B, and C are all reversed polarity, if no, the identification process ends; if yes, the meter identification is reversed.

[0053] In a specific embodiment, if the verification of all phases in the target energy metering device has not been completed, the maximum current value of the primary side of another phase in the target energy metering device is determined based on the daily current data to determine whether it is greater than a preset first current threshold.

[0054] When the maximum current value on the primary side of the phase in the target energy metering device is not greater than a preset first current threshold, the minimum current value on the primary side of the phase in the target energy metering device is determined to be less than or equal to a preset second current threshold based on the daily current consumption data, and the number of times the current value is less than 0 is determined to be greater than or equal to a preset number threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then the phase wiring state is determined to be reversed.

[0055] When the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold, it is determined whether the verification of all phases in the target energy metering device has been completed, until the verification of all phases in the target energy metering device has been completed.

[0056] That is, it is determined whether the verification of all phases in the target energy metering device has been completed. If the verification has not been completed, the above judgment process is repeated until the verification of all phases in the target energy metering device has been completed.

[0057] like Figure 2 As shown, embodiments of the present invention also provide a device for identifying the wiring status of an electricity metering device, for implementing the method for identifying the wiring status of an electricity metering device, comprising:

[0058] The metering device identification module is used to acquire the equipment parameters of the target energy metering device and identify whether the target energy metering device is a low-voltage three-phase meter based on the equipment parameters.

[0059] The first judgment module is used to extract the daily current and electricity consumption data obtained by the target electricity metering device from the metering master station within a preset time period when the target electricity metering device is identified as a low-voltage three-phase meter; and to determine whether the daily current and electricity consumption data is empty, and whether the user type corresponding to the target electricity metering device is a photovoltaic power generation customer or a local power plant customer.

[0060] The second judgment module is used to determine whether the maximum current value of any phase primary side of the target energy metering device is greater than a preset first current threshold when the daily current data is not empty and the user type corresponding to the target energy metering device is not a photovoltaic power generation customer or a local power plant user.

[0061] The third judgment module is used to determine, based on the daily electricity consumption data, whether the minimum current value of the primary side of the phase in the target electricity metering device is less than or equal to a preset second current threshold, and whether the number of times the current value is less than 0 is greater than or equal to a preset number threshold when the maximum current value of the primary side of the phase in the target electricity metering device is not greater than a preset first current threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then the wiring status of the phase is determined to be reversed.

[0062] The fourth judgment module is used to determine whether the verification of all phases in the target energy metering device has been completed when the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold; if the verification of all phases in the target energy metering device has been completed, then it is determined whether all phases in the target energy metering device are reversed; if all phases in the target energy metering device are reversed, it is determined that the target energy metering device is reversed.

[0063] Wherein, the first current threshold is a positive number, and the second current threshold is a negative number.

[0064] It should be noted that the apparatus described in the above embodiments corresponds to the method described in the above embodiments. Therefore, the parts of the apparatus described in the above embodiments that are not described in detail can be obtained by referring to the content of the method described in the above embodiments, and will not be repeated here.

[0065] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0066] The method and apparatus provided by this invention for identifying the wiring status of electricity metering devices utilize current data not limited to a specific point in time, but rather all current values ​​obtainable by the meter within the past 10 days. Furthermore, the number of times the current values ​​for all three phases (A, B, and C) are not zero is at least five times. This ensures that the current data represents a time period rather than a single point in time, providing a basis for longitudinal observation and comparative analysis. Additionally, it incorporates a comprehensive analysis to determine whether the user is a "photovoltaic power generation customer" or a "local power plant customer," solving the problem of accurately identifying whether low-phase meters are connected incorrectly based solely on current positive or negative values. The method boasts high accuracy, simplicity, and ease of operation. While contributing to energy conservation and efficiency for power companies and generating significant economic benefits, it also effectively improves the daily operation and management levels and line loss management capabilities of power companies.

[0067] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for identifying the wiring status of an electricity metering device, characterized in that, include: Obtain the equipment parameters of the target electricity metering device, and identify whether the target electricity metering device is a low-voltage three-phase meter based on the equipment parameters; When the target energy metering device is identified as a low-voltage three-phase meter, the daily current and energy consumption data obtained by the target energy metering device from the metering master station within a preset time period are extracted; and it is determined whether the daily current and energy consumption data is empty, and whether the user type corresponding to the target energy metering device is a photovoltaic power generation customer or a local power plant customer. When the daily current data is not empty and the user type corresponding to the target energy metering device is not a photovoltaic power generation customer or a local power plant user, the maximum current value of any phase primary side of the target energy metering device is determined according to the daily current data to see if it is greater than the preset first current threshold. When the maximum current value on the primary side of the phase in the target energy metering device is not greater than a preset first current threshold, the minimum current value on the primary side of the phase in the target energy metering device is determined to be less than or equal to a preset second current threshold based on the daily current consumption data, and the number of times the current value is less than 0 is determined to be greater than or equal to a preset number threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then the phase wiring state is determined to be reversed; When the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold, it is determined whether the verification of all phases in the target energy metering device has been completed; if the verification of all phases in the target energy metering device has been completed, it is determined whether all phases in the target energy metering device are connected in reverse; if all phases in the target energy metering device are connected in reverse, it is determined that the target energy metering device is connected in reverse. Wherein, the first current threshold is a positive number, and the second current threshold is a negative number.

2. The method as described in claim 1, characterized in that, The step of determining whether the daily electricity consumption data is empty includes: Determine whether the number of times the current in the daily electricity consumption data of the target electricity metering device is not equal to 0 is greater than a preset threshold for the number of times it is not empty; If the number of times the current in the daily electricity consumption data is not equal to 0 is greater than the preset threshold for the number of times it is not empty, then the daily electricity consumption data is determined to be not empty. If the number of times the current is not equal to 0 in the daily current energy data is not greater than the preset threshold for the number of times it is not empty, then the daily current energy data is determined to be empty.

3. The method as described in claim 2, characterized in that, Also includes: The identification process ends when the daily electricity consumption data is determined to be empty.

4. The method as described in claim 2, characterized in that, Also includes: The identification process ends when it is determined that the user type corresponding to the target electricity metering device is a photovoltaic power generation customer or a local power plant customer.

5. The method as described in claim 2, characterized in that, Also includes: The identification process ends when the maximum current value on the primary side of the target energy metering device exceeds a preset first current threshold.

6. The method as described in claim 2, characterized in that, Also includes: The identification process ends when all phases in the target energy metering device are not reversed.

7. The method according to any one of claims 1-6, characterized in that, Also includes: If the verification of all phases in the target energy metering device is not completed, then the maximum current value of the primary side of another phase in the target energy metering device is determined based on the daily current data to see if it is greater than a preset first current threshold.

8. The method as described in claim 7, characterized in that, Also includes: When the maximum current value on the primary side of the phase in the target energy metering device is not greater than a preset first current threshold, the minimum current value on the primary side of the phase in the target energy metering device is determined to be less than or equal to a preset second current threshold based on the daily current consumption data, and the number of times the current value is less than 0 is determined to be greater than or equal to a preset number threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then the phase wiring state is determined to be reversed.

9. The method as described in claim 8, characterized in that, Also includes: When the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold, it is determined whether the verification of all phases in the target energy metering device has been completed, until the verification of all phases in the target energy metering device has been completed.

10. A device for identifying the wiring status of an electricity metering device, for implementing the method as described in any one of claims 1-9, characterized in that, include: The metering device identification module is used to acquire the equipment parameters of the target energy metering device and identify whether the target energy metering device is a low-voltage three-phase meter based on the equipment parameters. The first judgment module is used to extract the daily current and electricity consumption data obtained by the target electricity metering device from the metering master station within a preset time period when the target electricity metering device is identified as a low-voltage three-phase meter; and to determine whether the daily current and electricity consumption data is empty, and whether the user type corresponding to the target electricity metering device is a photovoltaic power generation customer or a local power plant customer. The second judgment module is used to determine whether the maximum current value of any phase primary side of the target energy metering device is greater than a preset first current threshold when the daily current data is not empty and the user type corresponding to the target energy metering device is not a photovoltaic power generation customer or a local power plant user. The third judgment module is used to determine, based on the daily electricity consumption data, whether the minimum current value of the primary side of the phase in the target electricity metering device is less than or equal to a preset second current threshold, and whether the number of times the current value is less than 0 is greater than or equal to a preset number threshold when the maximum current value of the primary side of the phase in the target electricity metering device is not greater than a preset first current threshold; if the minimum current value is less than or equal to the preset second current threshold and the number of times the current value is less than 0 is greater than or equal to the preset number threshold, then the wiring status of the phase is determined to be reversed. The fourth judgment module is used to determine whether the verification of all phases in the target energy metering device has been completed when the minimum current value is not less than or equal to a preset second current threshold or the number of times the current value is less than 0 is not greater than or equal to a preset number threshold; if the verification of all phases in the target energy metering device has been completed, then it is determined whether all phases in the target energy metering device are reversed; if all phases in the target energy metering device are reversed, it is determined that the target energy metering device is reversed. Wherein, the first current threshold is a positive number, and the second current threshold is a negative number.

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