A method and system for identifying overloading of an electric energy meter

Abstract

The application provides a kind of electric energy meter overload identification method, comprising obtaining the type of meter connected to specified transformer and its related information;Wherein, the type includes single-phase meter, three-phase straight-through meter and three-phase ratio meter;Related information includes daily electricity, load rate, primary side current and secondary side current;According to the type of each meter and its related information, the first to third meters corresponding to the first to third predetermined conditions are screened out respectively;In the first type meter, daily electricity is compared with the first daily electricity threshold to identify heavy overload condition;In the second type meter, according to the primary side current and combined with the rated current, the three-phase load rate of the second type meter is calculated to identify heavy overload condition;In the third type meter, according to the secondary side current, the three-phase load rate of the third type meter is calculated to identify heavy overload condition. By implementing the application, the problem of misjudgment and missed judgment in the existing identification method can be solved, and the identification accuracy of electric energy meter heavy overload is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a method and system for identifying overload of an electric energy meter. BACKGROUND

[0002] With the rapid development of economy, the demand for electricity is growing, especially in hot weather, the demand for electricity surges, making the electric energy metering meter face higher load requirements. Once the meter is overloaded, not only does it reduce the accuracy of measurement and increase the economic losses of power companies, but it also causes fires due to overheating and accelerated aging of equipment, resulting in huge economic losses and safety hazards.

[0003] Currently, the existing methods for identifying overload of the meter mainly include the following cases: (1) an active power identification method, which compares the maximum instantaneous active power collected by the meter in a time period with a preset threshold to determine whether the meter is overloaded (e.g., if the maximum instantaneous active power exceeds 80% of the meter's capacity, it is judged to be overloaded; or if the maximum instantaneous active power exceeds 100% of the meter's capacity, it is judged to be overloaded), but it has certain limitations for three-phase unbalanced overload and misses the judgment of meter overload (e.g., if the maximum instantaneous active power is less than 80% of the meter's capacity, and the three-phase unbalanced overload accounts for more than 40% of the total overload); (2) a current identification method, which determines whether there is overload by comparing the current value measured by the meter with a set threshold, although this method can identify three-phase unbalanced overload compared to the active power identification method, on the one hand, it is restricted by narrowband narrow wave transmission capability and server storage capability, and some meters cannot identify whether there is overload due to the inability to obtain current and voltage, on the other hand, the current and voltage obtained due to different communication protocols of manufacturers are not necessarily true values, thus misjudging the overload of the meter.

[0004] Therefore, in order to solve the above problems, a new method for identifying overload of an electric energy meter is needed to improve the accuracy of identifying overload of the electric energy meter. SUMMARY

[0005] The technical problem to be solved by the embodiments of the present application is to provide a method and system for identifying overload of an electric energy meter, which can solve the problems of misjudgment and missed judgment in the existing identification method, and improve the accuracy of identifying overload of the electric energy meter.

[0006] To solve the above technical problems, the embodiments of the present application provide a method for identifying overload of an electric energy meter, which comprises the following steps:

[0007] acquire all meters connected to the transformer, and determine the type of each meter and its related information; wherein the type includes single-phase meter, three-phase straight-through meter and three-phase ratio meter; the related information includes daily electricity quantity, load rate, primary side current and secondary side current;

[0008] According to the type of each meter and its related information, filter out the first type of meter meeting the first predetermined condition, the second type of meter meeting the second predetermined condition and the third type of meter meeting the third predetermined condition; wherein the first predetermined condition is used to filter out the meter of single-phase type, and is set based on daily electricity quantity and load rate; the second predetermined condition is used to filter out the meter of three-phase straight-through type, and is set based on load rate and primary side current; the third predetermined condition is used to filter out the meter of three-phase ratio type, and is set based on secondary side current;

[0009] In the first type of meter, compare the respective corresponding daily electricity quantity with the preset first daily electricity quantity threshold value respectively, and according to the comparison result, identify the heavy overload condition of the first type of meter;

[0010] In the second type of meter, according to the respective corresponding primary side current, and in combination with the respective preset rated current, calculate the three-phase load rate of the second type of meter, and further according to the calculated three-phase load rate of the second type of meter, identify the heavy overload condition of the second type of meter;

[0011] In the third type of meter, according to the respective corresponding secondary side current, calculate the three-phase load rate of the third type of meter, and further according to the calculated three-phase load rate of the third type of meter, identify the heavy overload condition of the third type of meter.

[0012] In the first type of meter, compare the respective corresponding daily electricity quantity with the preset first daily electricity quantity threshold value respectively, and according to the comparison result, identify the heavy overload condition of the first type of meter;

[0013] If it is determined that the daily electricity quantity of at least one of the first type of meter is greater than or equal to the first daily electricity quantity threshold value, it is determined that the first type of meter whose daily electricity quantity is greater than or equal to the first daily electricity quantity threshold value is overloaded;

[0014] If it is determined that the daily electricity quantity of at least one of the first type of meter is less than the first daily electricity quantity threshold value, it is determined that the first type of meter whose daily electricity quantity is less than the first daily electricity quantity threshold value is heavily overloaded.

[0015] Wherein, the first predetermined condition is that the type of the meter is single-phase meter, and at least one phase of the meter has a load rate greater than or equal to a preset first load rate threshold value or a daily electricity quantity greater than a preset second daily electricity quantity threshold value; wherein the second daily electricity quantity threshold value is less than the first daily electricity quantity threshold value.

[0016] The step of calculating the three-phase load rate of the second type meter according to the respective corresponding primary side current and combining the respective preset rated current, and further identifying the heavy overload condition of the second type meter according to the calculated three-phase load rate of the second type meter, specifically comprises:

[0017] In the first preset time period, the primary side A-phase current, B-phase current and C-phase current of each second type meter are synchronously sampled at least three times, and the first three values of the primary side A-phase current, the primary side B-phase current and the primary side C-phase current of each second type meter are counted, and further, the first A-phase weight value, the first B-phase weight value and the first C-phase weight value are combined to calculate the A-phase load current, the B-phase load current and the C-phase load current of the corresponding primary side of each second type meter.

[0018] The primary side A-phase current, B-phase current and C-phase current of each second type meter are divided by the corresponding preset rated current, and the obtained values are respectively output as the A-phase load rate, the B-phase load rate and the C-phase load rate.

[0019] Based on the A-phase load rate, the B-phase load rate and the C-phase load rate of each second type meter, when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a certain second type meter is greater than or equal to the first preset value, it is determined that the current judged second type meter is overloaded; and,

[0020] When at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a certain second type meter is less than the first preset value and greater than or equal to the second preset value, it is determined that the current judged second type meter is heavily loaded; and,

[0021] When the A-phase load rate, the B-phase load rate and the C-phase load rate of a certain second type meter are all less than the second preset value, it is determined that the current judged second type meter is normal.

[0022] The second predetermined condition is that the type of the meter is a three-phase straight-through meter, and at least one phase of the meter has a load rate greater than or equal to a preset second load rate threshold value; and the three-phase current of the primary side of the meter is greater than a preset first current threshold value and less than a preset second current threshold value.

[0023] The step of calculating the three-phase load rate of the third type meter according to the respective corresponding secondary side current, and further identifying the heavy overload condition of the third type meter according to the calculated three-phase load rate of the third type meter, specifically comprises:

[0024] In a second preset time period, the secondary side A-phase current, B-phase current and C-phase current of each third type meter are synchronously sampled at least three times, and the first three values of the maximum secondary side A-phase current, the maximum secondary side B-phase current and the maximum secondary side C-phase current of each third type meter are counted, and further combined with the preset second A-phase weight value, second B-phase weight value and second C-phase weight value, the A-phase load current, B-phase load current and C-phase load current of each third type meter corresponding to the secondary side are calculated;

[0025] The secondary side A-phase current, B-phase current and C-phase current of each third type meter are divided by a rated constant, and the obtained values are respectively output as the A-phase load rate, B-phase load rate and C-phase load rate;

[0026] Based on the A-phase load rate, B-phase load rate and C-phase load rate of each third type meter, when at least one of the A-phase load rate, B-phase load rate and C-phase load rate of a certain third type meter is greater than or equal to a third preset value, it is determined that the current judged third type meter is overloaded; and,

[0027] When at least one of the A-phase load rate, B-phase load rate and C-phase load rate of a certain third type meter is less than the third preset value and greater than or equal to a fourth preset value, it is determined that the current judged third type meter is heavily loaded; and,

[0028] When the A-phase load rate, B-phase load rate and C-phase load rate of a certain third type meter are all less than the fourth preset value, it is determined that the current judged third type meter is normal.

[0029] The third predetermined condition is that the type of the meter is a three-phase ratio meter, at least one phase current of the secondary side of the meter is greater than or equal to a preset third current threshold value and less than a preset fourth current threshold value, the remaining phase currents are all greater than a preset fifth current threshold value and less than the fourth current threshold value, and the three-phase current of the primary side of the meter is all greater than a preset sixth current threshold value.

[0030] The embodiment of the present application also provides an identification system for electric energy meter overload and heavy load, which comprises:

[0031] A meter acquisition unit is configured to acquire all meters connected to a specified transformer and determine the type and related information of each meter; wherein the type includes a single-phase meter, a three-phase straight-through meter and a three-phase ratio meter; and the related information includes daily electricity quantity, load rate, primary side current and secondary side current;

[0032] The meter screening unit is configured to screen out the first type of meter meeting a first predetermined condition, the second type of meter meeting a second predetermined condition, and the third type of meter meeting a third predetermined condition according to the types of the meters and the related information of the meters; wherein the first predetermined condition is used for screening the meters of the type of single-phase meter and is set based on daily power consumption and load rate; the second predetermined condition is used for screening the meters of the type of three-phase straight-through meter and is set based on load rate and primary-side current; and the third predetermined condition is used for screening the meters of the type of three-phase ratio meter and is set based on secondary-side current.

[0033] The first heavy overload identification unit is configured to compare the daily power consumption of each of the first type of meter with a preset first daily power consumption threshold, respectively, and identify the heavy overload condition of the first type of meter according to the comparison result.

[0034] The second heavy overload identification unit is configured to calculate the three-phase load rate of the second type of meter according to the primary-side current of each of the second type of meter and in combination with the preset rated current of each of the second type of meter, and further identify the heavy overload condition of the second type of meter according to the calculated three-phase load rate of the second type of meter.

[0035] The third heavy overload identification unit is configured to calculate the three-phase load rate of the third type of meter according to the secondary-side current of each of the third type of meter, and further identify the heavy overload condition of the third type of meter according to the calculated three-phase load rate of the third type of meter.

[0036] The first heavy overload identification unit includes:

[0037] The daily power consumption identification overload module is configured to determine that the first type of meter is overloaded if it is determined that the daily power consumption of at least one of the first type of meter is greater than or equal to the first daily power consumption threshold.

[0038] The daily power consumption identification heavy overload module is configured to determine that the first type of meter is heavily overloaded if it is determined that the daily power consumption of at least one of the first type of meter is less than the first daily power consumption threshold.

[0039] The second heavy overload identification unit includes:

[0040] The first calculation three-phase load current module is configured to synchronously sample the primary side A-phase current, the primary side B-phase current and the primary side C-phase current of each second type meter for at least three times within a first preset time period, and count the first three values of the maximum primary side A-phase current, the maximum primary side B-phase current and the maximum primary side C-phase current sampled by each second type meter, and further calculate the A-phase load current, the B-phase load current and the C-phase load current of the corresponding primary side of each second type meter in combination with the preset first A-phase weight value, the first B-phase weight value and the first C-phase weight value.

[0041] The first calculation three-phase load rate module is configured to divide the primary side A-phase current, the primary side B-phase current and the primary side C-phase current of each second type meter by the corresponding preset rated current, and the obtained values are respectively output as the A-phase load rate, the B-phase load rate and the C-phase load rate.

[0042] The first overload identification module is configured to identify that a current judged second type meter is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of the current judged second type meter is greater than or equal to a first preset value.

[0043] The first overload identification module is configured to identify that a current judged second type meter is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of the current judged second type meter is greater than or equal to a first preset value.

[0044] The first overload identification module is configured to identify that a current judged second type meter is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of the current judged second type meter is greater than or equal to a first preset value.

[0045] The embodiment of the present application has the following beneficial effects:

[0046] The present application selects corresponding predetermined conditions for screening on the basis of the type of meter, daily power consumption, load rate, primary side current and secondary side current, and uses daily power consumption, primary side current or secondary side current to quickly identify the overload of the meter according to different types of meters, thereby solving the problems of misjudgment and missed judgment in the existing identification method, and improving the identification accuracy of the overload of the electric energy meter. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0048] Figure 1 A flow chart of a method for identifying overload of an electric energy meter according to an embodiment of the present application is provided.

[0049] Figure 2 A structural schematic diagram of a system for identifying overload of an electric energy meter according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the present application in detail with reference to the drawings.

[0051] As shown in Figure 1 A method for identifying overload of an electric energy meter according to an embodiment of the present application is provided, which comprises the following steps:

[0052] Step S1, all meters connected to a specified transformer are acquired, and the types and related information of the meters are determined; wherein, the types include single-phase meters, three-phase straight-through meters and three-phase ratio meters; the related information includes daily electric quantity, load rate, primary side current and secondary side current;

[0053] Step S2, according to the types and related information of the meters, a first type of meters meeting a first predetermined condition, a second type of meters meeting a second predetermined condition and a third type of meters meeting a third predetermined condition are screened out; wherein, the first predetermined condition is used for screening meters of the type of single-phase meters, and is set based on daily electric quantity and load rate; the second predetermined condition is used for screening meters of the type of three-phase straight-through meters, and is set based on load rate and primary side current; the third predetermined condition is used for screening meters of the type of three-phase ratio meters, and is set based on secondary side current;

[0054] Step S3, in the first type of meters, the respective corresponding daily electric quantities are compared with a preset first daily electric quantity threshold respectively, and according to the comparison results, the overload situation of the first type of meters is identified;

[0055] Step S4, in the second type of meters, according to the respective corresponding primary side currents and in combination with the respective preset rated currents, the three-phase load rates of the second type of meters are calculated, and further according to the calculated three-phase load rates of the second type of meters, the overload situation of the second type of meters is identified;

[0056] Step S5, in the third type meter, the three-phase load rate of the third type meter is calculated according to the respective corresponding secondary side current, and further, the heavy overload condition of the third type meter is identified according to the calculated three-phase load rate of the third type meter.

[0057] The specific process is that in step S1, a public transformer is selected as a specified transformer, and in the marketing system, all different types of meters of the users connected to the specified transformer are quickly obtained, including but not limited to single-phase meters, three-phase straight-through meters and three-phase rate meters. It should be noted that the three-phase straight-through meter is a three-phase meter with a rate of 1, and the three-phase rate meter is a three-phase meter with a rate greater than 1, and the three-phase meter includes a three-phase four-wire meter and a three-phase three-wire meter, etc.

[0058] Further, according to the type of each meter, the relevant information of each meter is obtained in the marketing system, including but not limited to daily electricity consumption, load rate, primary side current and secondary side current.

[0059] In step S2, considering that the single-phase meter will not appear three-phase imbalance phenomenon, the daily electricity consumption can be used as the identification condition for judging whether the meter exists heavy overload. In addition, for the three-phase straight-through meter and the three-phase rate meter, using the load current at a certain point as the identification condition for judging whether the meter exists heavy overload is quite one-sided and often appears false positives or false negatives. Therefore, for different types of meters, the present application sets different conditions to remove the meters with substandard daily electricity consumption or uncertain current, thereby improving the accuracy of detection.

[0060] Firstly, the first predetermined condition for the meter type being a single-phase meter is that the load rate of at least one phase is greater than or equal to a preset first load rate threshold (such as 0.8) or the daily electricity consumption is greater than a preset second daily electricity consumption threshold (such as 300 degrees), that is, the single-phase meter with any one phase load rate > 0.8 or daily electricity consumption > 300 degrees can be included in the subsequent heavy overload identification.

[0061] The second predetermined condition for the meter type being a three-phase straight-through meter is that the load rate of at least one phase is greater than or equal to a preset second load rate threshold (such as 0.8); and the three-phase current of the primary side is greater than a preset first current threshold (such as 0A) and less than a preset second current threshold (such as 200A), that is, the three-phase straight-through meter with any one phase load rate > 0.8 and 0 < primary side ABC three-phase current < 200A can be included in the subsequent heavy overload identification.

[0062] The third predetermined condition for the meter type of the three-phase multiplier meter is that at least one secondary side current is greater than or equal to a third preset current threshold (e.g., 4 A) and less than a fourth preset current threshold (e.g., 9 A), and the rest of the phase currents are greater than a fifth preset current threshold (e.g., 0 A) and less than the fourth current threshold; and the primary side three-phase current is greater than a sixth preset current threshold (e.g., 0 A), that is, the primary side ABC three-phase current > 0 and any one of the secondary side ABC phase currents > 4 A, that is, the primary side and the secondary side three-phase current cannot be 0, and at least one secondary side current > 4 A and < 9 A and the other phase currents < 9 A of the three-phase multiplier meter can be included in the subsequent overload recognition. In other words, first consider the three-phase multiplier meter with non-zero current, and then consider the three-phase multiplier meter with one of the secondary side ABC phase currents > 4 A, and then consider the three-phase multiplier meter with the secondary side ABC three-phase current < 9 A. If any of the sub-conditions is not met, it is not included in the subsequent overload recognition.

[0063] Secondly, according to the type of each meter and its related information, the first type of meter (i.e., the single-phase meter) meeting the first predetermined condition, the second type of meter (i.e., the three-phase straight-through meter) meeting the second predetermined condition, and the third type of meter (i.e., the three-phase multiplier meter) meeting the third predetermined condition are screened out.

[0064] In step S3, the overload condition of the first type of meter (i.e., the single-phase meter) is judged based on the daily electricity and the first preset daily electricity threshold.

[0065] At this time, if it is determined that at least one of the first type of meter has a daily electricity greater than or equal to the first daily electricity threshold (e.g., 400 degrees), it is determined that the first type of meter with daily electricity greater than or equal to the first daily electricity threshold is overloaded; otherwise, if it is determined that at least one of the first type of meter has a daily electricity less than the first daily electricity threshold, it is determined that the first type of meter with daily electricity less than the first daily electricity threshold is overloaded. It should be noted that the first type of meter (i.e., the single-phase meter) is screened by the second daily electricity threshold (e.g., 300 degrees), that is, the daily electricity of the first meter is first greater than the second daily electricity threshold (e.g., 300 degrees), and then it is less than the first daily electricity threshold (e.g., 400 degrees), and it can be seen that the second daily electricity threshold < the first daily electricity threshold.

[0066] In step S4, firstly, the primary side A-phase current, B-phase current and C-phase current of each second type meter (i.e. three-phase straight-through meter) are synchronously sampled at least three times (e.g. periodically sampled once every 2S) within a first preset time period (e.g. 30S), and the first three largest values of the primary side A-phase current, B-phase current and C-phase current sampled by each second type meter are counted, and further combined with the preset first A-phase weight value, first B-phase weight value and first C-phase weight value, the A-phase load current, B-phase load current and C-phase load current of the corresponding primary side of each second type meter are calculated.

[0067] In one example, the first preset time period is set to 30, and the sampling is performed once every 2S, and there are 15 sampling points. In addition, the first A-phase weight value, first B-phase weight value and first C-phase weight value are set to 1, 1 and 1 respectively.

[0068] In each second type meter, the first three largest values of the primary side A-phase current, B-phase current and C-phase current sampled by each second type meter are counted.

[0069] The formula I is used to calculate the load current I of any one phase of the ABC three-phase corresponding to the current second type meter. maxi = α * I i1 + β * I i2 + λ * I i3 , wherein i = 1, 2, 3 respectively correspond to A-phase, B-phase and C-phase, i.e. I maxi is the primary side A-phase load current, I max1 is the primary side B-phase load current, and I max2 is the primary side C-phase load current; I max3 , I i1 , I i2 , I i3 are the first three largest values of the primary side single-phase current of all meters in the current second type meter, I i1 is the largest, I i2 is the second largest, and I i3 is the smallest; α i , β i , λ i are three weight values respectively assigned to the first three largest values of the primary side single-phase current, and are fixed values, i.e. α, β, λ are the first A-phase weight value, first B-phase weight value and first C-phase weight value respectively.

[0070] Secondly, the primary side A-phase current, B-phase current and C-phase current of each second type meter are divided by the corresponding preset rated current, and the obtained values correspond to the output A-phase load rate, B-phase load rate and C-phase load rate respectively.

[0071] In one example, the A-phase load rate, B-phase load rate and C-phase load rate of a certain second-type meter are calculated by the formula R i = I maxi / I T = (a*I i1 + β*I i2 + λ*I i3 ) / I T , where R1 is the A-phase load rate, R2 is the B-phase load rate, and R3 is the C-phase load rate; I T is the rated current.

[0072] Finally, based on the A-phase load rate, B-phase load rate and C-phase load rate of each second-type meter, if at least one of the A-phase load rate, B-phase load rate and C-phase load rate of a certain second-type meter is greater than or equal to a first preset value (e.g., 1), it is determined that the certain second-type meter is overloaded; and,

[0073] if at least one of the A-phase load rate, B-phase load rate and C-phase load rate of a certain second-type meter is less than the first preset value and greater than or equal to a second preset value (e.g., 0.8), it is determined that the certain second-type meter is heavily loaded; and,

[0074] if the A-phase load rate, B-phase load rate and C-phase load rate of a certain second-type meter are all less than the second preset value, it is determined that the certain second-type meter is normal.

[0075] In one example, if the A-phase load rate R1 is greater than or equal to the first preset value 1, or the B-phase load rate R2 is greater than or equal to the first preset value 1, or the C-phase load rate R3 is greater than or equal to the first preset value 1, it is determined that the certain second-type meter is heavily loaded.

[0076] If the second preset value 0.8 is less than the A-phase load rate R1, or the second preset value 0.8 is less than the B-phase load rate R2, or the second preset value 0.8 is less than the C-phase load rate R3, it is determined that the certain second-type meter is overloaded.

[0077] If the A-phase load rate R1 is less than the second preset value 0.8, the B-phase load rate R2 is less than the second preset value 0.8, and the C-phase load rate R3 is less than the second preset value 0.8, it is determined that the certain second-type meter is normal.

[0078] In step S5, firstly, the secondary side A-phase current, B-phase current and C-phase current of each third type meter (i.e. three-phase multiplier meter) are synchronously sampled at least three times (e.g. periodically sampled once every 2 seconds) within a second preset time period (e.g. 30 seconds), and the first three values of the maximum secondary side A-phase current, the first three values of the maximum secondary side B-phase current and the first three values of the maximum secondary side C-phase current sampled by each third type meter are counted, and further combined with the preset second A-phase weight value, second B-phase weight value and second C-phase weight value, the A-phase load current, B-phase load current and C-phase load current of the corresponding secondary side of each third type meter are calculated.

[0079] Secondly, the secondary side A-phase current, B-phase current and C-phase current of each third type meter are divided by a rated constant (e.g. 5), and the obtained values correspond to the output A-phase load rate, B-phase load rate and C-phase load rate respectively.

[0080] Finally, based on the A-phase load rate, B-phase load rate and C-phase load rate of each third type meter, when at least one of the A-phase load rate, B-phase load rate and C-phase load rate of a certain third type meter is greater than or equal to a third preset value (e.g. 1), it is determined that the current judged third type meter is overloaded; and,

[0081] when at least one of the A-phase load rate, B-phase load rate and C-phase load rate of a certain third type meter is less than the third preset value and greater than or equal to a fourth preset value (e.g. 0.8), it is determined that the current judged third type meter is heavily loaded; and,

[0082] when the A-phase load rate, B-phase load rate and C-phase load rate of a certain third type meter are all less than the fourth preset value, it is determined that the current judged third type meter is normal.

[0083] It should be noted that step S5 and step S4 are different in the type of current, and other technical means are the same. For details, refer to the related content in step S4, which will not be described here.

[0084] As shown in FIG. 1, a system for identifying overloading and heavy loading of an electric energy meter according to an embodiment of the present application comprises: Figure 2 A meter acquisition unit 110 is configured to acquire all meters connected to a specified transformer and determine the type and related information of each meter. The type includes single-phase meter, three-phase straight-through meter and three-phase multiplier meter. The related information includes daily electricity quantity, load rate, primary side current and secondary side current.

[0085]

[0086] ​The meter screening unit 120 is configured to screen out the first type of meter meeting a first predetermined condition, the second type of meter meeting a second predetermined condition, and the third type of meter meeting a third predetermined condition according to the types of the meters and the related information of the meters; the first predetermined condition is used for screening the meters of the single-phase type and is set based on the daily electric quantity and the load rate; the second predetermined condition is used for screening the meters of the three-phase direct type and is set based on the load rate and the primary-side current; and the third predetermined condition is used for screening the meters of the three-phase ratio type and is set based on the secondary-side current.

[0087] The first heavy overload identification unit 130 is configured to compare the daily electric quantity of each of the first type of meters with a preset first daily electric quantity threshold, respectively, and identify the heavy overload condition of the first type of meters according to the comparison result.

[0088] The second heavy overload identification unit 140 is configured to calculate the three-phase load rate of the second type of meters according to the primary-side current of each of the second type of meters and in combination with the preset rated current of each of the second type of meters, and further identify the heavy overload condition of the second type of meters according to the calculated three-phase load rate of the second type of meters.

[0089] The third heavy overload identification unit 150 is configured to calculate the three-phase load rate of the third type of meters according to the secondary-side current of each of the third type of meters, and further identify the heavy overload condition of the third type of meters according to the calculated three-phase load rate of the third type of meters.

[0090] The first heavy overload identification unit 130 includes:

[0091] The daily electric quantity identification overload module is configured to determine that the first type of meters with the daily electric quantity greater than or equal to the first daily electric quantity threshold are overloaded if it is determined that the daily electric quantity of at least one of the first type of meters is greater than or equal to the first daily electric quantity threshold.

[0092] The daily electric quantity identification heavy overload module is configured to determine that the first type of meters with the daily electric quantity less than the first daily electric quantity threshold are heavily overloaded if it is determined that the daily electric quantity of at least one of the first type of meters is less than the first daily electric quantity threshold.

[0093] The second heavy overload identification unit 140 includes:

[0094] The first calculation three-phase load current module is configured to synchronously sample the primary side A-phase current, the primary side B-phase current and the primary side C-phase current of each second type meter for at least three times within a first preset time period, and to count the first three values of the maximum primary side A-phase current, the maximum primary side B-phase current and the maximum primary side C-phase current sampled by each second type meter, and further to calculate the A-phase load current, the B-phase load current and the C-phase load current of the corresponding primary side of each second type meter in combination with the preset first A-phase weight value, the first B-phase weight value and the first C-phase weight value.

[0095] The first calculation three-phase load rate module is configured to divide the primary side A-phase current, the primary side B-phase current and the primary side C-phase current of each second type meter by the corresponding preset rated current, and to output the obtained values as the A-phase load rate, the B-phase load rate and the C-phase load rate, respectively.

[0096] The first overload identification module is configured to identify that a current judged second type meter is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of the current judged second type meter is greater than or equal to a first preset value.

[0097] The first overload identification module is configured to identify that a current judged second type meter is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of the current judged second type meter is greater than or equal to a first preset value.

[0098] The first overload identification module is configured to identify that a current judged second type meter is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of the current judged second type meter is greater than or equal to a first preset value.

[0099] The embodiment of the present application has the following beneficial effects:

[0100] The present application selects corresponding predetermined conditions for screening on the basis of the type of meter, daily power consumption, load rate, primary side current and secondary side current, and uses daily power consumption, primary side current or secondary side current to quickly identify the overload of the meter according to different types of meters, thereby solving the problems of misjudgment and missed judgment in the existing identification method and improving the identification accuracy of the overload of the electric energy meter.

[0101] It is worth noting that the various system modules included in the above system embodiment are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, the specific names of the functional modules are only for easy mutual differentiation, and do not serve to limit the protection scope of the present application.

[0102] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disc and the like.

[0103] The above disclosure is only the preferred embodiment of the present application, and of course cannot limit the scope of the patent rights of the present application, so the equivalent changes made according to the claims of the present application still fall within the scope of the present application.

Claims

1. A method for identifying overload in an electricity meter, characterized in that, The method includes the following steps: Obtain all meters connected to the specified transformer and determine the type of each meter and its related information; wherein, the type includes single-phase meter, three-phase direct-through meter and three-phase multiplier meter; the related information includes daily power consumption, load rate, primary side current and secondary side current; Based on the type of each meter and its related information, a first category of meters that meets the first predetermined condition, a second category of meters that meets the second predetermined condition, and a third category of meters that meets the third predetermined condition are selected. The first predetermined condition is used to select single-phase meters and is set based on daily electricity consumption and load rate. The second predetermined condition is used to select three-phase direct-through meters and is set based on load rate and primary side current. The third predetermined condition is used to select three-phase multiplier meters and is set based on secondary side current. In the first type of meter, the corresponding daily electricity consumption is compared with the preset first daily electricity consumption threshold, and the heavy overload situation of the first type of meter is identified based on the comparison results. In the second type of meter, the three-phase load rate of the second type of meter is calculated based on its corresponding primary current and its preset rated current, and the heavy overload condition of the second type of meter is further identified based on the calculated three-phase load rate of the second type of meter. In the third type of meter, the three-phase load rate of the third type of meter is calculated based on the corresponding secondary side current, and the heavy overload condition of the third type of meter is further identified based on the calculated three-phase load rate of the third type of meter.

2. The method for identifying overload of an electricity meter as described in claim 1, characterized in that, The step of comparing the daily electricity consumption of each of the first type of meters with a preset first daily electricity consumption threshold, and identifying the heavy overload condition of the first type of meters based on the comparison results, specifically includes: If it is determined that at least one of the first type of meters has a daily electricity consumption greater than or equal to the first daily electricity consumption threshold, then the first type of meters whose daily electricity consumption is all greater than or equal to the first daily electricity consumption threshold are considered to be overloaded. If it is determined that at least one of the first type of meters has a daily electricity consumption less than the first daily electricity consumption threshold, then the first type of meters whose daily electricity consumption is less than the first daily electricity consumption threshold are considered to be overloaded.

3. The method for identifying overload of an electricity meter as described in claim 2, characterized in that, The first predetermined condition is that the meter is a single-phase meter, and at least one phase of it has a load rate greater than or equal to a preset first load rate threshold or a daily electricity consumption greater than a preset second daily electricity consumption threshold; wherein the second daily electricity consumption threshold is less than the first daily electricity consumption threshold.

4. The method for identifying overload of an electricity meter as described in claim 1, characterized in that, In the second type of meter, the step of calculating the three-phase load rate of the second type of meter based on its corresponding primary current and its preset rated current, and further identifying the heavy overload condition of the second type of meter based on the calculated three-phase load rate, specifically includes: Within the first preset time period, the primary side A-phase current, B-phase current and C-phase current of each second type of meter are sampled at least three times simultaneously, and the top three values ​​of the largest primary side A-phase current, the top three values ​​of the largest primary side B-phase current and the top three values ​​of the largest primary side C-phase current sampled by each second type of meter are counted. Furthermore, combined with the preset first A-phase weight value, first B-phase weight value and first C-phase weight value, the A-phase load current, B-phase load current and C-phase load current of the primary side corresponding to each second type of meter are calculated. Divide the primary side A-phase current, B-phase current and C-phase current of each of the second type of meters by its corresponding preset rated current, and the resulting values ​​are respectively output as A-phase load rate, B-phase load rate and C-phase load rate. Based on the A-phase load rate, B-phase load rate, and C-phase load rate of each of the second type of meters, if at least one of the A-phase load rate, B-phase load rate, and C-phase load rate of a certain second type of meter is currently determined to be greater than or equal to a first preset value, the currently determined second type of meter is considered to be overloaded; and, If at least one of the phase A load rate, phase B load rate, and phase C load rate of a certain second-type meter is less than the first preset value and greater than or equal to the second preset value, the currently determined second-type meter is considered to be overloaded; and, When the load rates of phase A, phase B, and phase C of a certain second-class meter are all less than the second preset value, the second-class meter is deemed to be normal.

5. The method for identifying overload of an electricity meter as described in claim 4, characterized in that, The second predetermined condition is that the meter is a three-phase direct-through meter, and at least one of its phases has a load rate greater than or equal to a preset second load rate threshold; and the three-phase currents on its primary side are all greater than a preset first current threshold and less than a preset second current threshold.

6. The method for identifying overload of an electricity meter as described in claim 1, characterized in that, The steps of calculating the three-phase load rate of the third type of meter based on its corresponding secondary current, and further identifying the heavy overload condition of the third type of meter based on the calculated three-phase load rate, specifically include: Within the second preset time period, the secondary side A-phase current, B-phase current and C-phase current of each of the third type of meters are sampled at least three times simultaneously, and the top three values ​​of the largest secondary side A-phase current, the top three values ​​of the largest secondary side B-phase current and the top three values ​​of the largest secondary side C-phase current sampled by each of the third type of meters are counted. Furthermore, combined with the preset second A-phase weight value, second B-phase weight value and second C-phase weight value, the A-phase load current, B-phase load current and C-phase load current of the corresponding secondary side of each of the third type of meters are calculated. Divide the secondary side A-phase current, B-phase current and C-phase current of each of the third type of meters by the rated constant, and the resulting values ​​are respectively output as A-phase load rate, B-phase load rate and C-phase load rate. Based on the A-phase load rate, B-phase load rate, and C-phase load rate of each of the aforementioned third-type meters, if at least one of the A-phase load rate, B-phase load rate, and C-phase load rate of a certain third-type meter is currently determined to be greater than or equal to a third preset value, the currently determined third-type meter is deemed to be overloaded; and, If at least one of the phase A load rate, phase B load rate, and phase C load rate of a certain third-class meter is less than the third preset value and greater than or equal to the fourth preset value, the currently determined third-class meter is considered to be overloaded; and... When the load rates of phase A, phase B, and phase C of a certain third-class meter are all less than the fourth preset value, the third-class meter is deemed to be normal.

7. The method for identifying overload of an electricity meter as described in claim 6, characterized in that, The third predetermined condition is that the meter is a three-phase multiplier meter, and at least one phase current on its secondary side is greater than or equal to a preset third current threshold and less than a preset fourth current threshold, while the currents of the remaining phases are all greater than a preset fifth current threshold and less than the fourth current threshold; and the three phase currents on its primary side are all greater than a preset sixth current threshold.

8. A system for identifying overload in an electricity meter, characterized in that, include: The meter acquisition unit is used to acquire all meters connected to a specified transformer and determine the type of each meter and its related information; wherein, the type includes single-phase meter, three-phase direct-through meter and three-phase multiplier meter; the related information includes daily power consumption, load rate, primary side current and secondary side current; The meter screening unit is used to screen out a first type of meter that meets a first predetermined condition, a second type of meter that meets a second predetermined condition, and a third type of meter that meets a third predetermined condition, based on the type of each meter and its related information. The first predetermined condition is used to screen single-phase meters and is set based on daily electricity consumption and load rate. The second predetermined condition is used to screen three-phase direct-through meters and is set based on load rate and primary side current. The third predetermined condition is used to screen three-phase multiplier meters and is set based on secondary side current. The first overload identification unit is used to compare the corresponding daily electricity consumption of each of the first type of meters with a preset first daily electricity consumption threshold, and identify the overload situation of the first type of meters based on the comparison results. The second overload identification unit is used to calculate the three-phase load rate of the second type of meter based on its corresponding primary current and its preset rated current, and further identify the overload condition of the second type of meter based on the calculated three-phase load rate. The third overload identification unit is used to calculate the three-phase load rate of the third type of meter based on its corresponding secondary side current, and further identify the heavy overload condition of the third type of meter based on the calculated three-phase load rate.

9. The overload detection system for electricity meters as described in claim 8, characterized in that, The first overload identification unit includes: The daily electricity consumption identification overload module is used to determine that if at least one of the first type of meters has a daily electricity consumption greater than or equal to the first daily electricity consumption threshold, then the first type of meters with daily electricity consumption greater than or equal to the first daily electricity consumption threshold are overloaded. The daily electricity consumption identification overload module is used to determine that the first type of meters are overloaded if it is determined that at least one of the first type of meters has a daily electricity consumption of less than the first daily electricity consumption threshold.

10. The energy meter overload identification system as described in claim 8, characterized in that, The second overload identification unit includes: The first three-phase load current calculation module is used to simultaneously sample the A-phase current, B-phase current and C-phase current of each second type of meter at least three times within a first preset time period, and to count the top three values ​​of the largest A-phase current, the largest B-phase current and the largest C-phase current of each second type of meter. Furthermore, it combines the preset first A-phase weight value, first B-phase weight value and first C-phase weight value to calculate the A-phase load current, B-phase load current and C-phase load current of the corresponding primary side of each second type of meter. The first three-phase load rate calculation module is used to divide the primary side A-phase current, B-phase current and C-phase current of each of the second type of meters by its corresponding preset rated current, and the resulting values ​​are respectively output as A-phase load rate, B-phase load rate and C-phase load rate. The first overload identification module is used to determine that a given second-type meter is overloaded if at least one of the phase A, phase B, and phase C load rates of each second-type meter is greater than or equal to a first preset value; and, If at least one of the phase A load rate, phase B load rate, and phase C load rate of a certain second-type meter is less than the first preset value and greater than or equal to the second preset value, the currently determined second-type meter is considered to be overloaded; and, When the load rates of phase A, phase B, and phase C of a certain second-class meter are all less than the second preset value, the second-class meter is deemed to be normal.

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