Method and system for identifying weighing overload of electric energy meter

Abstract

The invention provides a method for identifying weighing overload of an electric energy meter. The method comprises the following steps: acquiring the type and related information of a meter connected with a specified transformer; wherein the type comprises a single-phase meter, a three-phase straight-through meter and a three-phase multiplying power meter; the related information comprises daily electric quantity, load rate, primary side current and secondary side current; according to the type of each meter and the related information thereof, screening out first to third meters respectively corresponding to first to third predetermined conditions; in the first type of meters, comparing the daily electric quantity with a first daily electric quantity threshold value to identify a heavy overload condition; in the second type of meters, the three-phase load rate of the second type of meters is calculated according to the primary side current and the rated current to identify the heavy overload condition; and in the third-class meter, calculating the three-phase load rate of the third-class meter according to the secondary side current to identify the heavy overload condition. By implementing the method, the problems of misjudgment and missed judgment in the existing identification method can be solved, and the identification accuracy of the weighing overload of the electric energy meter is improved.

Description

Technical Field

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

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

[0003] At present, the existing methods for identifying heavy overload of meters mainly include the following situations: (1) Based on the active power identification method, this method compares the maximum instantaneous active power collected by the meter in a period of time with the preset threshold to determine whether the meter is heavily overloaded (for example, the maximum instantaneous active power exceeds 80% of the meter capacity rate, which is judged as heavy load; or the maximum instantaneous active power exceeds 100% of the meter capacity rate, which is judged as overload). However, there are certain limitations for heavy overloads caused by unbalanced three-phase loads, and heavy overloads of meters may be missed (for example, the maximum instantaneous active power is less than 80% of the meter capacity rate, (ii) Based on the current identification method, this method determines whether there is a heavy overload by whether the current value measured by the meter exceeds the set threshold. Although compared with the active power identification method, this method can identify the heavy overload of three-phase imbalance, on the one hand, it is restricted by the narrowband narrowwave transmission capacity and server storage capacity. Some meters cannot obtain the current and voltage and are difficult to identify whether there is a heavy overload. On the other hand, the current and voltage obtained by the different communication protocols of the manufacturers are not necessarily the true values, which leads to the misjudgment of the meter being overloaded.

[0004] Therefore, in order to solve the above problems, a new method for identifying overload of electric energy meters is urgently needed to improve the accuracy of identifying overload of electric energy meters. Summary of the invention

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

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a method for identifying an electric energy meter overload, the method comprising the following steps:

[0007] Obtain all meters connected to the specified transformer, and determine the type of each meter and related information; wherein the types include single-phase meter, three-phase direct meter and three-phase rate meter; the related information includes daily power, load rate, primary current and secondary current;

[0008] According to the types of each meter and related information thereof, 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 are screened out; wherein the first predetermined condition is used to screen a meter of a single-phase meter type, and is set based on daily power consumption and load rate; the second predetermined condition is used to screen a meter of a three-phase direct-through meter type, and is set based on load rate and primary-side current; the third predetermined condition is used to screen a meter of a three-phase multiplier meter type, and is set based on secondary-side current;

[0009] In the first type of meters, the corresponding daily electricity consumption is respectively compared with the preset first daily electricity consumption threshold, and according to the comparison result, the heavy overload condition of the first type of meters is identified;

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

[0011] In the third category meter, the three-phase load rate of the third category meter is calculated according to the respective corresponding secondary side currents, and further according to the calculated three-phase load rate of the third category meter, the heavy overload condition of the third category meter is identified.

[0012] The step of comparing the daily electricity consumption of each corresponding meter with the preset first daily electricity consumption threshold in the first type of meter and identifying the heavy overload condition of the first type of meter according to the comparison result specifically includes:

[0013] If it is determined that the daily electricity consumption of at least one of the first-category meters is greater than or equal to the first daily electricity consumption threshold, it is determined that the first-category meters whose daily electricity consumption is greater than or equal to the first daily electricity consumption threshold are overloaded;

[0014] If it is determined that the daily electricity consumption of at least one of the first-category meters is less than the first daily electricity consumption threshold, the first-category meters whose daily electricity consumption is less than the first daily electricity consumption threshold are deemed to be overloaded.

[0015] Among them, the first predetermined condition is that the meter type is a single-phase meter, and the load rate of at least one phase thereof is greater than or equal to a preset first load rate threshold or the daily power consumption is greater than a preset second daily power consumption threshold; wherein, the second daily power consumption threshold is less than the first daily power consumption threshold.

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

[0017] In a first preset time period, the primary-side A-phase current, B-phase current and C-phase current of each second-category meter are sampled synchronously at least three times, and the top three values ​​of the maximum primary-side A-phase current, the top three values ​​of the maximum primary-side B-phase current and the top three values ​​of the maximum primary-side C-phase current sampled by each second-category meter are counted, and further combined with the preset first A-phase weight value, the first B-phase weight value and the first C-phase weight value, the A-phase load current, the B-phase load current and the C-phase load current corresponding to the primary side of each second-category meter are calculated;

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

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

[0021] When the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-category meter currently determined are all smaller than the second preset value, it is determined that the second-category meter currently determined is normal.

[0022] Among them, the second predetermined condition is that the type of meter is a three-phase through meter, and the load rate of at least one phase thereof is greater than or equal to a preset second load rate threshold; and the three-phase currents on its primary side are all greater than the preset first current threshold and less than the preset second current threshold.

[0023] The step of calculating the three-phase load rate of the third-type meter according to the corresponding secondary-side currents in the third-type meter, 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 includes:

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

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

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

[0027] When at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a third-category meter currently determined is less than the third preset value and greater than or equal to the fourth preset value, the third-category meter currently determined is overloaded; and

[0028] When it is currently determined that the A-phase load rate, the B-phase load rate and the C-phase load rate of a third-category meter are all smaller than the fourth preset value, it is determined that the third-category meter currently determined is normal.

[0029] Among them, the third predetermined condition is that the type of 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, and the remaining phase currents are greater than the preset fifth current threshold and less than the fourth current threshold; and the three-phase currents on its primary side are all greater than the preset sixth current threshold.

[0030] The embodiment of the present invention further provides a system for identifying an electric energy meter overload, comprising:

[0031] A meter acquisition unit, used to acquire all meters connected to the specified transformer, and determine the type of each meter and related information thereof; wherein the types include single-phase meters, three-phase direct meters, and three-phase rate meters; the related information includes daily power consumption, load rate, primary current, and secondary current;

[0032] A meter screening unit, for screening out first-category meters meeting a first predetermined condition, second-category meters meeting a second predetermined condition, and third-category meters meeting a third predetermined condition according to the types of the meters and related information thereof; wherein the first predetermined condition is used to screen out meters of the single-phase type, and is set based on the daily power consumption and the load rate; the second predetermined condition is used to screen out meters of the three-phase direct-flow type, and is set based on the load rate and the primary-side current; the third predetermined condition is used to screen out meters of the three-phase multiplier type, and is set based on the secondary-side current;

[0033] A first heavy overload identification unit is used to compare the daily electricity consumption corresponding to each of the first type of meters with the preset first daily electricity consumption threshold value, and identify the heavy overload situation of the first type of meters according to the comparison result;

[0034] a second heavy overload identification unit, for calculating the three-phase load rate of the second-type meter according to the respective corresponding primary-side currents and in combination with the respective preset rated currents in the second-type meter, 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;

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

[0036] Wherein, the first heavy overload identification unit includes:

[0037] A daily electricity quantity identification overload module, configured to determine that the first category of meters whose daily electricity quantity is greater than or equal to the first daily electricity quantity threshold is overloaded if it is determined that the daily electricity quantity of at least one of the first category of meters is greater than or equal to the first daily electricity quantity threshold;

[0038] The daily electricity quantity identification and overload module is used to determine that the first category of meters whose daily electricity quantity is less than the first daily electricity quantity threshold is overloaded if it is determined that the daily electricity quantity of at least one of the first category of meters is less than the first daily electricity quantity threshold.

[0039] Wherein, the second overload identification unit comprises:

[0040] A first three-phase load current calculation module is used to synchronously sample the primary-side A-phase current, B-phase current and C-phase current of each second-category meter at least three times within a first preset time period, and count the top three values ​​of the maximum primary-side A-phase current, the top three values ​​of the maximum primary-side B-phase current and the top three values ​​of the maximum primary-side C-phase current sampled by each second-category meter, and further calculate the A-phase load current, B-phase load current and C-phase load current of the primary side corresponding to each second-category 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] A 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 meters by their corresponding preset rated currents, and the obtained values ​​are output as the A-phase load rate, the B-phase load rate and the C-phase load rate respectively;

[0042] A first overload identification module is used for determining that the second-type meter currently being judged is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-type meter currently being judged is greater than or equal to a first preset value based on the A-phase load rate, the B-phase load rate and the C-phase load rate of each of the second-type meters; and

[0043] When at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-type meter currently being determined is less than the first preset value and greater than or equal to the second preset value, the second-type meter currently being determined is determined to be overloaded; and

[0044] When the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-category meter currently determined are all smaller than the second preset value, it is determined that the second-category meter currently determined is normal.

[0045] Implementing the embodiments of the present invention has the following beneficial effects:

[0046] The present invention selects corresponding predetermined conditions for screening based on the type of meter, daily electricity, load rate, primary current and secondary current, and uses daily electricity, primary current or secondary current to quickly identify the heavy overload situation 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 accuracy of identifying the heavy overload of the electric energy meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0048] Figure 1 A flow chart of a method for identifying an electric energy meter overload provided by an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of the structure of a system for identifying an electric energy meter overload provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0051] like Figure 1 As shown in the figure, a method for identifying an electric energy meter overload is proposed in an embodiment of the present invention, and the method comprises the following steps:

[0052] Step S1, obtaining all meters connected to the specified transformer, and determining the type of each meter and related information thereof; wherein the types include single-phase meter, three-phase direct meter and three-phase rate meter; the related information includes daily power, load rate, primary current and secondary current;

[0053] Step S2: According to the types of each meter and related information thereof, screen out the first type of meter that meets the first predetermined condition, the second type of meter that meets the second predetermined condition, and the third type of meter that meets the third predetermined condition; wherein the first predetermined condition is used to screen the meter of the single-phase meter type, and is set based on the daily power consumption and the load rate; the second predetermined condition is used to screen the meter of the three-phase direct-through meter type, and is set based on the load rate and the primary side current; the third predetermined condition is used to screen the meter of the three-phase multiplier meter type, and is set based on the secondary side current;

[0054] Step S3: in the first type of meters, the daily electricity consumption corresponding to each meter is compared with the preset first daily electricity consumption threshold value, and the heavy overload condition of the first type of meter is identified according to the comparison result;

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

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

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

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

[0059] In step S2, considering that a single-phase meter will not have a three-phase imbalance phenomenon, the daily electricity quantity can be used as an identification condition to determine whether the meter is heavily overloaded. In addition, for three-phase direct-flow meters and three-phase rate meters, using the load current at a certain point in time as an identification condition to determine whether the meter is heavily overloaded is quite one-sided and often results in false alarms or misreporting. Therefore, for different types of meters, the present invention sets different conditions to remove meters with substandard daily electricity quantity or current uncertainty, thereby improving the accuracy of detection.

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

[0061] The second predetermined condition set for the meter type being a three-phase direct-flow 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 currents on its primary side are all greater than a preset first current threshold (such as 0A) and less than a preset second current threshold (such as 200A), that is, a three-phase direct-flow meter with any 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 setting the meter type as a three-phase rate meter is that at least one phase current on its secondary side is greater than or equal to the preset third current threshold (such as 4A) and less than the preset fourth current threshold (such as 9A), and the other phase currents are greater than the preset fifth current threshold (such as 0A) and less than the fourth current threshold; and, the three-phase currents on its primary side are all greater than the preset sixth current threshold (such as 0A), that is, the three-phase currents of the primary side ABC>0 and any phase current of the secondary side ABC>4A, that is, the three-phase currents of the primary side and the secondary side cannot be 0, and the three-phase rate meter with at least one phase current>4A and<9A on the secondary side and other phase currents<9A can be included in the subsequent heavy overload identification. In other words, first consider the three-phase rate meter with current that is not empty, and on this basis, consider the three-phase rate meter with one phase current>4A on the secondary side ABC, and then consider the three-phase rate meter with all three phase currents of the secondary side ABC<9A. As long as any sub-condition is not met, it will not be included in the subsequent heavy overload identification.

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

[0064] In step S3, the heavy overload condition of the first type of meter (ie, the single-phase meter) is determined based on the daily electricity consumption and a preset first daily electricity consumption threshold.

[0065] At this time, if it is determined that at least one of the first-category meters has a daily electricity consumption greater than or equal to the first-day electricity consumption threshold (such as 400 degrees), the first-category meters whose daily electricity consumption is greater than or equal to the first-day electricity consumption threshold are deemed to be overloaded; conversely, if it is determined that at least one of the first-category meters has a daily electricity consumption less than the first-day electricity consumption threshold, the first-category meters whose daily electricity consumption is less than the first-day electricity consumption threshold are deemed to be overloaded. It should be noted that the first-category meters (i.e., single-phase meters) are screened by the second-day electricity consumption threshold (such as 300 degrees), that is, the daily electricity consumption of the overloaded first meter is first greater than the second-day electricity consumption threshold (such as 300 degrees), and secondly, it must be less than the first-day electricity consumption threshold (such as 400 degrees). It can be seen that the second-day electricity consumption threshold < the first-day electricity consumption threshold.

[0066] In step S4, first, within a first preset time period (such as 30S), the primary side A-phase current, B-phase current and C-phase current of each second-category meter (i.e., three-phase direct-flow meter) are sampled synchronously for at least three times (such as periodic sampling once every 2S), and the top three largest values ​​of the primary side A-phase current, the top three largest values ​​of the primary side B-phase current and the top three largest values ​​of the primary side C-phase current sampled by each second-category meter are counted, and further combined with the preset first A-phase weight value, the first B-phase weight value and the first C-phase weight value, the A-phase load current, the B-phase load current and the C-phase load current corresponding to the primary side of each second-category meter are calculated.

[0067] In one example, the first preset period is set to 30, the sampling is performed every 2S, and there are 15 sampling points in total. Also, the first A-phase weight value, the first B-phase weight value, and the first C-phase weight value are set;

[0068] Count the first three largest values ​​of the primary side A phase current, the first three largest values ​​of the primary side B phase current, and the first three largest values ​​of the primary side C phase current sampled by each second-class meter;

[0069] By formula I maxi =α*I i1 +β*I i2 +λ*I i3 , calculate the current load current I corresponding to any phase of the three phases ABC of a certain second-class meter maxi Among them, i = 1, 2, 3 correspond to phase A, phase B and phase C respectively, that is, I max1 is the primary side A phase load current, I max2 is the primary side B phase load current, I max3 is the primary side C phase load current; I i1 ,I i2 ,I i3 I is the first three digits of the largest single-phase current on the primary side of all the meters in the current second-class meter. i1 is the maximum, I i2 Next, I i3 is the minimum; α i , β i , i The three weight values ​​are assigned in sequence to the first three largest values ​​of the primary side single-phase current, and all are fixed values, that is, α, β, and λ are the first A phase weight value, the first B phase weight value, and the 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 their corresponding preset rated currents, and the obtained values ​​are output as the corresponding A phase load rate, B phase load rate and C phase load rate respectively.

[0071] In one example, through the formula R i = I maxi / I T = (α * I i1 + β * I i2 + λ * I i3 ) / I T , the A-phase load rate, B-phase load rate, and C-phase load rate of a current second-type meter are calculated. That is, 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 of the second-type meters, when it is currently determined that 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 (such as 1), it is determined that the currently judged second-type meter is overloaded; and,

[0073] when it is currently determined that 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 (such as 0.8), it is determined that the currently judged second-type meter is heavily loaded; and,

[0074] when it is currently determined that 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 currently judged second-type meter is normal.

[0075] In one example, if the A-phase load rate R1 >= the first preset value 1, or the B-phase load rate R2 >= the first preset value 1, or the C-phase load rate R3 >= the first preset value 1, then it is determined that the currently judged second-type meter is heavily loaded;

[0076] if the second preset value 0.8 <= A-phase load rate R1 < the first preset value 1, or the second preset value 0.8 <= B-phase load rate R2 < the first preset value 1, or the second preset value 0.8 <= C-phase load rate R3 < the first preset value 1, then it is determined that the currently judged second-type meter is overloaded;

[0077] if the A-phase load rate R1 < the second preset value 0.8, the B-phase load rate R2 < the second preset value 0.8, and the C-phase load rate R3 < the second preset value 0.8, then it is determined that the currently judged second-type meter is normal.

[0078] In step S5, first, within a second preset time period (such as 30S), the secondary side A-phase current, B-phase current and C-phase current of each third-category meter (i.e., three-phase rate meter) are sampled synchronously at least three times (such as periodic sampling once at an interval of 2S), and the top three largest values ​​of the secondary side A-phase current, the top three largest values ​​of the secondary side B-phase current and the top three largest values ​​of the secondary side C-phase current sampled by each third-category meter are counted, and further combined with the preset second A-phase weight value, the second B-phase weight value and the second C-phase weight value, the A-phase load current, the B-phase load current and the C-phase load current corresponding to the secondary side of each of the third-category meters are calculated.

[0079] Secondly, the secondary side A phase current, B phase current and C phase current of each third category meter are divided by the rated constant (such as 5), and the obtained values ​​are output as the corresponding A phase load rate, B phase load rate and C phase load rate respectively.

[0080] Finally, based on the A-phase load rate, the B-phase load rate, and the C-phase load rate of each third-category meter, when it is currently determined that at least one of the A-phase load rate, the B-phase load rate, and the C-phase load rate of a third-category meter is greater than or equal to a third preset value (such as 1), the third-category meter currently determined is overloaded; and,

[0081] When at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a third-category meter currently being determined is less than a third preset value and greater than or equal to a fourth preset value (such as 0.8), the third-category meter currently being determined is overloaded; and,

[0082] When it is currently determined that the A-phase load rate, the B-phase load rate, and the C-phase load rate of a third-category meter are all less than the fourth preset value, it is determined that the third-category meter currently determined is normal.

[0083] It should be noted that, except for the different current types targeted, other technical means of step S5 and step S4 are the same. For specific examples, please refer to the relevant content in step S4, and no further examples will be given here.

[0084] like Figure 2 As shown in the figure, an electric energy meter overload identification system is provided in an embodiment of the present invention, comprising:

[0085] The meter acquisition unit 110 is used to acquire all meters connected to the specified transformer and determine the type of each meter and related information thereof; wherein the types include single-phase meters, three-phase direct meters and three-phase rate meters; the related information includes daily power consumption, load rate, primary current and secondary current;

[0086] The meter screening unit 120 is used to screen out the first type of meters that meet the first predetermined condition, the second type of meters that meet the second predetermined condition, and the third type of meters that meet the third predetermined condition according to the types of the meters and related information thereof; wherein the first predetermined condition is used to screen the meters that are single-phase meters, and is set based on the daily power consumption and the load rate; the second predetermined condition is used to screen the meters that are three-phase direct-flow meters, and is set based on the load rate and the primary side current; the third predetermined condition is used to screen the meters that are three-phase multiplier meters, and is set based on the secondary side current;

[0087] A first heavy overload identification unit 130 is used to compare the daily electricity consumption of each corresponding meter with the preset first daily electricity consumption threshold value in the first type of meters, and identify the heavy overload situation of the first type of meters according to the comparison result;

[0088] A second heavy overload identification unit 140 is used to calculate the three-phase load rate of the second type of meter according to the respective corresponding primary side currents and in combination with the respective preset rated currents in the second type of meter, and further identify the heavy overload situation of the second type of meter according to the calculated three-phase load rate of the second type of meter;

[0089] The third heavy overload identification unit 150 is used to calculate the three-phase load rate of the third type of meter according to the corresponding secondary side current in the third type of meter, and further identify the heavy overload situation of the third type of meter according to the calculated three-phase load rate of the third type of meter.

[0090] Wherein, the first overload identification unit 130 includes:

[0091] A daily electricity quantity identification overload module, configured to determine that the first category of meters whose daily electricity quantity is greater than or equal to the first daily electricity quantity threshold is overloaded if it is determined that the daily electricity quantity of at least one of the first category of meters is greater than or equal to the first daily electricity quantity threshold;

[0092] The daily electricity quantity identification and overload module is used to determine that the first category of meters whose daily electricity quantity is less than the first daily electricity quantity threshold is overloaded if it is determined that the daily electricity quantity of at least one of the first category of meters is less than the first daily electricity quantity threshold.

[0093] Wherein, the second overload identification unit 140 includes:

[0094] A first three-phase load current calculation module is used to synchronously sample the primary-side A-phase current, B-phase current and C-phase current of each second-category meter at least three times within a first preset time period, and count the top three values ​​of the maximum primary-side A-phase current, the top three values ​​of the maximum primary-side B-phase current and the top three values ​​of the maximum primary-side C-phase current sampled by each second-category meter, and further calculate the A-phase load current, B-phase load current and C-phase load current of the primary side corresponding to each second-category 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] A 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 meters by their corresponding preset rated currents, and the obtained values ​​are output as the A-phase load rate, the B-phase load rate and the C-phase load rate respectively;

[0096] A first overload identification module is used for determining that the second-type meter currently being judged is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-type meter currently being judged is greater than or equal to a first preset value based on the A-phase load rate, the B-phase load rate and the C-phase load rate of each of the second-type meters; and

[0097] When at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-type meter currently being determined is less than the first preset value and greater than or equal to the second preset value, the second-type meter currently being determined is determined to be overloaded; and

[0098] When the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-category meter currently determined are all smaller than the second preset value, it is determined that the second-category meter currently determined is normal.

[0099] Implementing the embodiments of the present invention has the following beneficial effects:

[0100] The present invention selects corresponding predetermined conditions for screening based on the type of meter, daily electricity, load rate, primary current and secondary current, and uses daily electricity, primary current or secondary current to quickly identify the heavy overload situation 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 accuracy of identifying the heavy overload of the electric energy meter.

[0101] It is worth noting that in the above system embodiment, the various system modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of the various functional modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0102] A person skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, CD-ROM, etc.

[0103] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for identifying overload of an electric energy meter, characterized in that: The method comprises the following steps: Obtain all meters connected to the specified transformer, and determine the type of each meter and related information; wherein the types include single-phase meter, three-phase direct meter and three-phase rate meter; the related information includes daily power, load rate, primary current and secondary current; According to the types of each meter and related information thereof, 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 are screened out; wherein the first predetermined condition is used to screen a meter of a single-phase meter type, and is set based on daily power consumption and load rate; the second predetermined condition is used to screen a meter of a three-phase direct-through meter type, and is set based on load rate and primary-side current; the third predetermined condition is used to screen a meter of a three-phase multiplier meter type, and is set based on secondary-side current; In the first type of meters, the corresponding daily electricity consumption is respectively compared with the preset first daily electricity consumption threshold, and according to the comparison result, the heavy overload condition of the first type of meters is identified; In the second-type meter, the three-phase load rate of the second-type meter is calculated according to the respective corresponding primary-side currents and in combination with the respective preset rated currents, and further, the heavy overload condition of the second-type meter is identified according to the calculated three-phase load rate of the second-type meter; In the third category meter, the three-phase load rate of the third category meter is calculated according to the respective corresponding secondary side currents, and further according to the calculated three-phase load rate of the third category meter, the heavy overload condition of the third category meter is identified.

2. The method for identifying an overload of an electric energy meter according to claim 1, characterized in that: In the first type of meter, the steps of comparing the daily electricity consumption of each corresponding meter with the preset first daily electricity consumption threshold respectively, and identifying the heavy overload situation of the first type of meter according to the comparison result specifically include: If it is determined that the daily electricity consumption of at least one of the first-category meters is greater than or equal to the first daily electricity consumption threshold, it is determined that the first-category meters whose daily electricity consumption is greater than or equal to the first daily electricity consumption threshold are overloaded; If it is determined that the daily electricity consumption of at least one of the first-category meters is less than the first daily electricity consumption threshold, the first-category meters whose daily electricity consumption is less than the first daily electricity consumption threshold are deemed to be overloaded.

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

4. The method for identifying an electric energy meter overload according to claim 1, characterized in that: The step of calculating the three-phase load rate of the second-type meter according to the respective corresponding primary-side currents and in combination with the respective preset rated currents in the second-type meter, 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 includes: In a first preset time period, the primary-side A-phase current, B-phase current and C-phase current of each second-category meter are sampled synchronously at least three times, and the top three values ​​of the maximum primary-side A-phase current, the top three values ​​of the maximum primary-side B-phase current and the top three values ​​of the maximum primary-side C-phase current sampled by each second-category meter are counted, and further combined with the preset first A-phase weight value, the first B-phase weight value and the first C-phase weight value, the A-phase load current, the B-phase load current and the C-phase load current corresponding to the primary side of each second-category meter are calculated; The primary side A-phase current, B-phase current and C-phase current of each second-type meter are divided by their corresponding preset rated currents, and the obtained values ​​are output as the A-phase load rate, the B-phase load rate and the C-phase load rate respectively; Based on the A-phase load rate, the B-phase load rate and the C-phase load rate of each of the second-type meters, when it is currently determined that at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-type meter is greater than or equal to a first preset value, the second-type meter currently determined is determined to be overloaded; and When at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-type meter currently being determined is less than the first preset value and greater than or equal to the second preset value, the second-type meter currently being determined is determined to be overloaded; and When the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-category meter currently determined are all smaller than the second preset value, it is determined that the second-category meter currently determined is normal.

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

6. The method for identifying an electric energy meter overload according to claim 1, characterized in that: The step of calculating the three-phase load rate of the third-type meter according to the corresponding secondary-side currents in the third-type meter, 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 includes: In the second preset time period, the secondary side A-phase current, B-phase current and C-phase current of each of the third-category meters are sampled synchronously at least three times, 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-category meters are counted, and further combined with the preset second A-phase weight value, the second B-phase weight value and the second C-phase weight value, the A-phase load current, the B-phase load current and the C-phase load current corresponding to the secondary side of each of the third-category meters are calculated; The A-phase current, B-phase current and C-phase current of the secondary side of each of the third-type meters are divided by the rated constant, and the obtained values ​​are output as the A-phase load rate, the B-phase load rate and the C-phase load rate respectively; Based on the A-phase load rate, the B-phase load rate and the C-phase load rate of each of the third-category meters, when it is currently determined that at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a third-category meter is greater than or equal to a third preset value, the third-category meter currently determined is overloaded; and When at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a third-category meter currently determined is less than the third preset value and greater than or equal to the fourth preset value, the third-category meter currently determined is overloaded; and When it is currently determined that the A-phase load rate, the B-phase load rate and the C-phase load rate of a third-category meter are all smaller than the fourth preset value, it is determined that the third-category meter currently determined is normal.

7. The method for identifying an electric energy meter overload according to 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, and the remaining phase currents are greater than the preset fifth current threshold and less than the fourth current threshold; and the three-phase currents on its primary side are greater than the preset sixth current threshold.

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

9. The electric energy meter overload identification system according to claim 8, characterized in that: The first overload identification unit comprises: A daily electricity quantity identification overload module, configured to determine that the first category of meters whose daily electricity quantity is greater than or equal to the first daily electricity quantity threshold is overloaded if it is determined that the daily electricity quantity of at least one of the first category of meters is greater than or equal to the first daily electricity quantity threshold; The daily electricity quantity identification and overload module is used to determine that the first category of meters whose daily electricity quantity is less than the first daily electricity quantity threshold is overloaded if it is determined that the daily electricity quantity of at least one of the first category of meters is less than the first daily electricity quantity threshold.

10. The electric energy meter overload identification system according to claim 8, characterized in that: The second overload identification unit comprises: A first three-phase load current calculation module is used to synchronously sample the primary-side A-phase current, B-phase current and C-phase current of each second-category meter at least three times within a first preset time period, and count the top three values ​​of the maximum primary-side A-phase current, the top three values ​​of the maximum primary-side B-phase current and the top three values ​​of the maximum primary-side C-phase current sampled by each second-category meter, and further calculate the A-phase load current, B-phase load current and C-phase load current of the primary side corresponding to each second-category meter in combination with the preset first A-phase weight value, the first B-phase weight value and the first C-phase weight value; A 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 meters by their corresponding preset rated currents, and the obtained values ​​are output as the A-phase load rate, the B-phase load rate and the C-phase load rate respectively; A first overload identification module is used for determining that the second-type meter currently being judged is overloaded when at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-type meter currently being judged is greater than or equal to a first preset value based on the A-phase load rate, the B-phase load rate and the C-phase load rate of each of the second-type meters; and When at least one of the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-type meter currently being determined is less than the first preset value and greater than or equal to the second preset value, the second-type meter currently being determined is determined to be overloaded; and When the A-phase load rate, the B-phase load rate and the C-phase load rate of a second-category meter currently determined are all smaller than the second preset value, it is determined that the second-category meter currently determined is normal.

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