A method, device, equipment and medium for judging overload of distribution transformer

Abstract

The present invention discloses a method, device, equipment and medium for judging whether a distribution transformer is overloaded. In response to received request information, a distribution transformer corresponding to the request information is selected as a distribution transformer to be judged; multiple three-phase current history data of the distribution transformer to be judged within a preset time period are obtained from a preset metering database; the equivalent load ratio is calculated using the three-phase current history data; the equivalent load ratio is compared with a preset overload threshold, and whether the distribution transformer to be judged is overloaded is judged according to the comparison result. The equivalent load ratio is calculated by using multiple three-phase current history data of a preset time period, and whether the distribution transformer to be judged is overloaded is judged according to the comparison result of the equivalent load ratio and the preset overload threshold, while considering the factors of short-term or instantaneous overload and three-phase imbalance, which effectively improves the accuracy of judging whether the distribution transformer is overloaded.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment monitoring, and in particular to a method, device, equipment and medium for judging whether a distribution transformer is overloaded. Background Art

[0002] Distribution transformers are key equipment for power distribution and carry the power supply capacity at the end of the power grid. When the distribution transformer is overloaded, from the user's perspective, the voltage of the end user will be reduced, resulting in the user being unable to enjoy high-quality power supply, which may seriously affect the normal use of the user's home appliances. From the power grid perspective, overloading of the distribution transformer will cause the temperature of the distribution transformer to rise. When the temperature reaches 90°C, the life of the transformer will be shortened by half for every 6°C increase in temperature. Therefore, temperature is a direct factor affecting the insulation life of the transformer.

[0003] At present, the real-time load rate is usually used as an electrical feature to determine whether the distribution transformer is overloaded. When the load rate is greater than 80%, it is determined to be overloaded.

[0004] However, the user load in the distribution network changes rapidly, and the above method only takes into account the real-time load rate and can only make overload judgments at a certain moment, which makes it impossible to accurately judge whether the distribution transformer is overloaded. Summary of the invention

[0005] The present invention provides a method, device, equipment and medium for judging whether a distribution transformer is overloaded, which is used to solve the technical problem that when judging whether a distribution transformer is overloaded, the user load in the distribution network changes rapidly, and the judgment method using the existing technology only considers the real-time load rate and can only make an overload judgment at a certain moment, resulting in an inability to accurately judge whether the distribution transformer is overloaded.

[0006] A first aspect of the present invention provides a method for determining whether a distribution transformer is overloaded, comprising:

[0007] In response to the received request information, selecting a distribution transformer corresponding to the request information as the distribution transformer to be determined;

[0008] Acquire multiple three-phase current historical data of the distribution transformer to be judged within a preset time period from a preset metering database;

[0009] Calculating an equivalent load ratio using the three-phase current historical data;

[0010] The equivalent load ratio is compared with a preset overload threshold, and whether the distribution transformer to be determined is overloaded is determined according to the comparison result.

[0011] Optionally, the step of calculating the equivalent load ratio by using the three-phase current historical data includes:

[0012] Calculate the actual load rate data by using the maximum phase current value of each phase current in the three-phase current historical data;

[0013] Generate three-phase unbalance data based on the sum calculation result of each phase current and the preset overload judgment percentage threshold;

[0014] The sum of the actual load rate data and the three-phase imbalance rate data is calculated to obtain an equivalent load ratio.

[0015] Optionally, the step of calculating the actual load rate data by using the maximum phase current of each phase current in the three-phase current historical data includes:

[0016] Obtaining the maximum phase current value of each of the three-phase current historical data;

[0017] Calculating a first ratio between each of the maximum values ​​of the phase current and the rated current of the distribution transformer to be judged, and determining a first integer value smaller than the first ratio as current judgment data;

[0018] Comparing each of the current judgment data with the rated current of the distribution transformer to be judged, and generating a judgment value according to the comparison result;

[0019] Calculate the sum of all the judgment values ​​to obtain sum data;

[0020] A second ratio between the sum data and a preset overload judgment threshold is calculated, and a first integer value smaller than the second ratio is determined as the actual load rate data.

[0021] Optionally, the step of comparing each current judgment data with the rated current of the distribution transformer to be judged and generating a judgment value according to the comparison result includes:

[0022] Comparing each of the current judgment data with the rated current of the distribution transformer to be judged;

[0023] If the current judgment data is greater than the rated current of the distribution transformer to be judged, the first preset judgment value is determined as the judgment value;

[0024] If the current judgment data is smaller than the rated current of the distribution transformer to be judged, the second preset judgment value is determined as the judgment value.

[0025] Optionally, the step of generating three-phase imbalance data according to the calculation result of the sum of the phase currents in combination with a preset overload judgment percentage threshold comprises:

[0026] respectively calculating the phase current and value of each of the phase currents;

[0027] Obtaining a maximum phase current sum value and a minimum phase current sum value among the phase current sum values;

[0028] calculating a third ratio between the maximum phase current sum value and the minimum phase current sum value;

[0029] A fourth ratio between the third ratio and the preset overload judgment percentage threshold is calculated, and a first integer value smaller than the fourth ratio is determined as the three-phase imbalance rate data.

[0030] Optionally, involving multiple load terminals, the method further comprises:

[0031] Acquire existing three-phase current data from each load terminal through the metering database according to a preset data collection interval, and cache it as new three-phase current historical data;

[0032] The load terminal is used to measure the three-phase current data of the distribution transformer in real time.

[0033] Optionally, the step of comparing the equivalent load ratio with a preset overload threshold and judging whether the distribution transformer to be judged is overloaded according to the comparison result includes:

[0034] comparing the equivalent load ratio with a preset overload threshold;

[0035] If the equivalent load ratio is greater than or equal to the preset overload threshold, it is determined that the distribution transformer to be determined is overloaded;

[0036] If the equivalent load ratio is less than the preset overload threshold, it is determined that the distribution transformer to be determined is not overloaded.

[0037] A second aspect of the present invention provides a device for determining whether a distribution transformer is overloaded, comprising:

[0038] A response selection module, configured to select, in response to the received request information, a distribution transformer corresponding to the request information as the distribution transformer to be determined;

[0039] An acquisition module, used for acquiring a plurality of three-phase current historical data of the distribution transformer to be judged within a preset time period from a preset metering database;

[0040] An information processing module, used for calculating an equivalent load ratio using the three-phase current historical data;

[0041] The judgment module is used to compare the equivalent load ratio with a preset overload threshold value, and judge whether the distribution transformer to be judged is overloaded according to the comparison result.

[0042] A third aspect of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method for determining whether a distribution transformer is overloaded as described in any one of the above items.

[0043] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the method for determining whether a distribution transformer is overloaded as described in any one of the above items.

[0044] It can be seen from the above technical solutions that the present invention has the following advantages:

[0045] The present invention, when responding to the received request information, reads the request information, selects the distribution transformer corresponding to the request information as the distribution transformer to be judged, obtains multiple three-phase current history data of the distribution transformer to be judged in a preset time period from a preset metering database, calculates the equivalent load ratio based on the three-phase current history data obtained from the metering database, compares the calculated equivalent load ratio with the preset heavy load threshold, and uses the comparison result to judge whether the distribution transformer to be judged is overloaded, thereby solving the problem that when judging whether the distribution transformer is overloaded, the user load in the distribution network changes rapidly, and the judgment method using the prior art only considers the real-time load rate, and can only make an overload judgment at a certain moment, resulting in the inability to accurately judge whether the distribution transformer is overloaded. The present invention calculates the equivalent load ratio through multiple three-phase current history data of a preset time period, judges whether the distribution transformer to be judged is overloaded according to the comparison result of the equivalent load ratio and the preset heavy load threshold, and considers the factors of short-term or instantaneous overload and three-phase imbalance at the same time, effectively improving the accuracy of judging whether the distribution transformer is overloaded. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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, other drawings can be obtained based on these drawings without paying creative labor.

[0047] Figure 1 A flow chart of the steps of a method for determining whether a distribution transformer is overloaded provided in Embodiment 1 of the present invention;

[0048] Figure 2 A flow chart of the steps of a method for determining whether a distribution transformer is overloaded provided in Embodiment 2 of the present invention;

[0049] Figure 3 A structural block diagram of a device for determining whether a distribution transformer is overloaded provided in Embodiment 3 of the present invention;

[0050] Figure 4 A schematic diagram of the framework of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The embodiments of the present invention provide a method, device, equipment and medium for determining whether a distribution transformer is overloaded, which is used to solve the technical problem that when determining whether a distribution transformer is overloaded, the user load in the distribution network changes rapidly, and the determination method using the prior art only considers the real-time load rate and can only perform overload determination at a certain moment, resulting in an inability to accurately determine whether the distribution transformer is overloaded.

[0052] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] See also Figure 1 , Figure 1 A flowchart of the steps of a method for determining whether a distribution transformer is overloaded is provided in Embodiment 1 of the present invention.

[0054] The present invention provides a method for determining whether a distribution transformer is overloaded, comprising:

[0055] Step 101: In response to received request information, select a distribution transformer corresponding to the request information as a distribution transformer to be determined.

[0056] A distribution transformer is a static electrical device that converts AC voltage and current according to the law of electromagnetic induction to transmit AC power in a power distribution system. A voltage transformer is an instrument used to convert voltage. It is mainly used to supply power to measuring instruments and relay protection devices, to measure the voltage, power and energy of a line, or to protect valuable equipment, motors and transformers in the line when a line fault occurs.

[0057] The request information refers to the request information command sent to determine whether the distribution transformer is overloaded when the user notices that the voltage of the distribution transformer has dropped and affected the normal use of the electrical equipment, or the request information command sent to determine whether the distribution transformer is overloaded when the voltage change of the distribution transformer is detected by the voltage transformer. The request information includes the area, number and / or location of the distribution transformer to be determined. The present invention does not specifically limit the device used to detect voltage changes at the upper end. This embodiment uses a voltage transformer as an example.

[0058] In this embodiment, when a request message is received from any user or a voltage transformer used to detect voltage changes of a distribution transformer, the request message is read to obtain the location of the distribution transformer, thereby determining the distribution transformer as the distribution transformer to be judged and performing an overload judgment on it.

[0059] Step 102: Acquire a plurality of three-phase current historical data of the distribution transformer to be determined within a preset time period from a preset metering database.

[0060] The metering database, specifically a metering automation system preset locally, is a device responsible for the collection, data management, data transmission of electric energy information at each metering point, and the execution or forwarding of control commands issued by the control center. It contains a three-phase current history database, which is used to store the three-phase current data of the distribution transformer and store the three-phase current data as new three-phase current history data. The preset period can be set according to demand.

[0061] The three-phase current historical data refers to the three-phase current data of the distribution transformer. It is cached as new three-phase current historical data through the metering database and is important data for calculating whether the distribution transformer is overloaded.

[0062] In this embodiment, after measuring the three-phase current data of the distribution transformer and storing the three-phase current data as new three-phase current historical data, the device obtains multiple three-phase current historical data corresponding to the distribution transformer to be judged from the metering database according to a preset time period.

[0063] Step 103: Calculate the equivalent load ratio using the three-phase current historical data.

[0064] The equivalent load ratio refers to the sum of the actual load rate data of the distribution transformer to be judged and the three-phase unbalance data, and is used to judge whether the distribution transformer to be judged is under heavy load operation.

[0065] The actual load rate data refers to actual load data of the distribution transformer to be judged, and is one of the factors for judging whether the distribution transformer to be judged is overloaded.

[0066] The three-phase unbalance data refers to load data of the distribution transformer to be determined under three-phase unbalance, and is one of the factors for determining whether the distribution transformer to be determined is overloaded.

[0067] In this embodiment, the three-phase current historical data in the metering database is obtained, the actual load rate data and the three-phase imbalance data are calculated respectively through the three-phase current historical data, and the equivalent load ratio is calculated through the sum of the actual load rate data and the three-phase imbalance data.

[0068] Step 104: compare the equivalent load ratio with the preset overload threshold, and determine whether the distribution transformer to be determined is overloaded according to the comparison result.

[0069] The preset overload threshold refers to the overload boundary value of the distribution transformer, which is used for comparison with the equivalent load ratio.

[0070] In this embodiment, the equivalent load ratio of the distribution transformer to be judged is obtained, and the equivalent load ratio is compared with the preset overload threshold. If the equivalent load ratio of the distribution transformer to be judged is greater than or equal to the preset overload threshold, it is determined that the distribution transformer to be judged is overloaded; if the equivalent load ratio of the distribution transformer to be judged is less than the preset overload threshold, it is determined that the distribution transformer to be judged is not overloaded.

[0071] In an embodiment of the invention, when responding to the received request information, the request information is read, and the distribution transformer corresponding to the request information is selected as the distribution transformer to be judged, and multiple three-phase current history data of the distribution transformer to be judged in a preset time period are obtained from a preset metering database, and the three-phase current history data obtained in the metering database are used to calculate the equivalent load ratio based on the three-phase current history data, and the calculated equivalent load ratio is compared with the preset overload threshold value, and the comparison result is used to judge whether the distribution transformer to be judged is overloaded, thereby solving the problem that when judging whether the distribution transformer is overloaded, the user load in the distribution network changes rapidly, and the judgment method using the prior art only considers the real-time load rate, and can only make an overload judgment at a certain moment, resulting in the inability to accurately judge whether the distribution transformer is overloaded. The present invention calculates the equivalent load ratio through multiple three-phase current history data of a preset time period, and judges whether the distribution transformer to be judged is overloaded according to the comparison result of the equivalent load ratio and the preset overload threshold value, while considering the factors of short-term or instantaneous overload and the three-phase imbalance factor, effectively improving the accuracy of judging whether the distribution transformer is overloaded.

[0072] See also Figure 2 , Figure 2 A flow chart of the steps of a method for determining whether a distribution transformer is overloaded provided in Embodiment 2 of the present invention.

[0073] The present invention provides a method for determining whether a distribution transformer is overloaded, comprising:

[0074] Step 201: In response to the received request information, a distribution transformer corresponding to the request information is selected as the distribution transformer to be determined.

[0075] In the embodiment of the present invention, the specific implementation process of step 201 is similar to step 101 and will not be repeated here.

[0076] In another example of the present invention, the distribution transformers can also be divided according to the areas where they are located, and all the distribution transformers in each area can be numbered. Each distribution transformer has a unique entry, and the entry is used to store the location and number of the distribution transformer. When a request message sent by any user or voltage transformer is received, the request message is read, and the area, number and location of the distribution transformer to be determined corresponding to the request message are obtained, and it is checked whether the location and number of the distribution transformer in the entry are consistent with the number and location in the request information. If they are consistent, a reload judgment is performed on them.

[0077] In another example of the present invention, all distribution transformers are divided into areas, and all distribution transformers in each area are numbered. Each distribution transformer has a unique entry, and the entry is used to store the location and number of the distribution transformer. When a request message sent by any user or voltage transformer is received, the request message is read, and the area and number of the distribution transformer to be judged corresponding to the request message are obtained, and it is checked whether the number of the distribution transformer in the entry is consistent with the number in the request message. If they are consistent, a reload judgment is performed on it.

[0078] In another example of the present invention, all distribution transformers are divided into areas, all distribution transformers in each area are numbered, and each distribution transformer has a unique entry for storing the location and number of the distribution transformer. When a request message sent by any user or voltage transformer is received, the request message is read, the area and location of the distribution transformer to be determined corresponding to the request message are obtained, and it is verified whether the location of the distribution transformer in the entry is consistent with the location in the request message. If they are consistent, a reload judgment is performed on it.

[0079] Step 202: Acquire a plurality of three-phase current historical data of the distribution transformer to be determined within a preset time period from a preset metering database.

[0080] In an embodiment of the present invention, the three-phase current data of the distribution transformer is received through the metering database, and the three-phase current data is stored as new three-phase current history data, a preset time period is determined, the number of three-phase current history data is determined according to the preset time period, and multiple three-phase current history data within the preset time period of the distribution transformer to be judged are obtained through the metering database. When the preset time period is selected as the transformer to be judged in the past 24 hours, the number of three-phase current history data is 96, and 96 three-phase current history data of the distribution transformer to be judged in the area in the past 24 hours are obtained from the preset metering database.

[0081] Step 203, using the maximum phase current of each phase current in the three-phase current historical data to calculate the actual load rate data.

[0082] Optionally, step 203 may include the following sub-steps S11-S15.

[0083] Step S11, obtaining the maximum phase current value of each three-phase current historical data.

[0084] In the embodiment of the present invention, each three-phase current history data contains a phase current I a , Phase current I b and phase current I c , select the phase current I a , phase current I b and phase current I c The maximum value in .

[0085] Step S12, calculating a first ratio between the maximum value of each phase current and the rated current of the distribution transformer to be judged, and determining the first integer value smaller than the first ratio as the current judgment data.

[0086] In the embodiment of the present invention, the maximum phase current is the phase current I a , phase current I b and phase current I c The maximum value among them is used to calculate the phase current I a , Phase current I b and phase current I c The ratio between the maximum value in and the rated current of the distribution transformer to be judged is obtained to obtain a first ratio, and the first integer value less than the first ratio is determined as the current judgment data, and the current judgment value is one of the factors for calculating the judgment value.

[0087] It should be noted that, because the situation that the maximum phase current in operation exceeds 2 times the rated current of the distribution transformer to be judged does not exist, the first integer value less than the first ratio is determined as the current judgment data. Because the transformer to be judged has 96 three-phase current historical data in the past 24 hours, there are a total of 96 phase current maximum values. The ratios between the 96 phase current maximum values ​​and the rated current of the distribution transformer to be judged are calculated respectively, and 96 current judgment values ​​will be generated.

[0088] Step S13, comparing each current judgment data with the rated current of the distribution transformer to be judged, and generating a judgment value according to the comparison result.

[0089] Optionally, step S13 may include the following sub-steps S131-S133:

[0090] Step S131, comparing each current judgment data with the rated current of the distribution transformer to be judged.

[0091] In the embodiment of the present invention, each current judgment data obtained is compared with the rated current of the distribution transformer to be judged. There are 96 current judgment data in total, and the 96 current judgment data are compared with the rated current of the distribution transformer to be judged.

[0092] Step S132: if the current judgment data is greater than the rated current of the distribution transformer to be judged, the first preset judgment value is determined as the judgment value.

[0093] In an embodiment of the present invention, if the current judgment data is greater than the rated current of the distribution transformer to be judged, the first preset judgment value is determined as the judgment value, and the first preset judgment value is 1.

[0094] Step S133: if the current judgment data is less than the rated current of the distribution transformer to be judged, the second preset judgment value is determined as the judgment value.

[0095] In an embodiment of the present invention, if the current judgment data is less than the rated current of the distribution transformer to be judged, the second preset judgment value is determined as the judgment value, and the second preset judgment value is 0.

[0096] Step S14, calculating the sum of all judgment values ​​to obtain sum data.

[0097] In the embodiment of the present invention, 96 judgment values ​​are generated, and the sum of the 96 judgment values ​​is calculated, that is, the sum of all the first preset judgment values ​​and the second preset judgment values ​​is calculated to generate a sum value data.

[0098] Step S15, calculating a second ratio between the sum data and a preset overload judgment threshold, and determining the first integer value smaller than the second ratio as the actual load rate data.

[0099] In an embodiment of the present invention, the ratio between the sum value data and the preset overload judgment threshold is calculated to obtain a second ratio. Among them, this embodiment selects that when the cumulative time of the load rate exceeding 80% in 24 hours a day exceeds 2 hours, it is considered that the distribution transformer is overloaded, so the preset overload judgment threshold is selected as 8. Since 15 minutes is a measurement point, 2 hours is 8 measurement points, and the first integer value less than the second ratio is determined as the actual load rate data. The preset overload judgment threshold can be determined according to demand. For example, when the cumulative time of the load rate exceeding 80% in 24 hours a day exceeds 3 hours, it is considered that the distribution transformer is overloaded, and the preset overload judgment threshold is selected as 12, and so on.

[0100] Step 204: Generate three-phase unbalance data based on the calculation result of the sum of the currents of each phase and the preset overload judgment percentage threshold.

[0101] Optionally, step 204 may include the following sub-steps S21-S24:

[0102] Step S21, respectively calculating the phase current and value of each phase current.

[0103] In the embodiment of the present invention, the phase current I is calculated respectively. a , Phase current I b and phase current I c The sum of the three-phase current data of the transformer to be judged in the past 24 hours is 96, and the 96 phase currents I a The sum of 96 phase currents I b The sum of the 96 phase currents I c The sum of the phase currents I a Sum value, phase current I b The sum of the phase current I c and value.

[0104] Step S22, obtaining the maximum phase current sum value and the minimum phase current sum value among the phase current sum values.

[0105] In the embodiment of the present invention, the phase current I is obtained a Sum value, phase current I b The sum of the phase current I c The maximum phase current sum value and the minimum phase current sum value in the sum value.

[0106] Step S23, calculating a third ratio between the maximum phase current sum and the minimum phase current sum. a Sum value, phase current I b The sum of the phase current I cThe maximum phase current sum value and the minimum phase current sum value in the sum values ​​are calculated, and the ratio between the maximum phase current sum value and the minimum phase current sum value is calculated to obtain a third ratio.

[0107] Step S24, calculating a fourth ratio between the third ratio and a preset overload judgment percentage threshold, and determining the first integer value less than the fourth ratio as the three-phase imbalance rate data.

[0108] In an embodiment of the present invention, a fourth ratio is obtained by calculating the ratio between the calculated third ratio and the preset overload judgment percentage threshold, wherein the preset overload judgment percentage threshold is 130%. When the three-phase imbalance reaches 30%, it is considered that the transformer is overloaded, and the first integer value less than the fourth ratio is determined as the three-phase imbalance rate data.

[0109] Step 205, calculating the sum of the actual load rate data and the three-phase unbalance rate data to obtain an equivalent load ratio.

[0110] In the embodiment of the present invention, the sum of the actual load rate data and the three-phase unbalance rate data is calculated to generate the equivalent load ratio.

[0111] It should be noted that when the cumulative time of the load rate exceeding 80% in 24 hours exceeds 2 hours, the distribution transformer is considered to be overloaded. Since there is one measurement point every 15 minutes, 2 hours means 8 measurement points. The phase current I of the i-th (i=1,2,3...96) measurement point is a , Phase current I b and phase current I c The ratio of the maximum value in to the rated current of the distribution transformer is obtained to obtain the first ratio, and the first integer value less than the first ratio is determined as the current judgment data. If the current judgment data is greater than the rated current, it is recorded as one overload (because the situation where the maximum value of the phase current in operation exceeds 2 times the rated current of the distribution transformer to be judged does not exist), the sum of the number of overloads in 96 measurement points and the preset overload judgment threshold of 8 is obtained to obtain the second ratio, and the first integer value less than the second ratio is determined as the actual load rate data; when the three-phase imbalance reaches 30%, it is considered that the transformer is overloaded, and the phase current I in the past 24 hours is a , Phase current I b and phase current I c There is a measurement data every 15 minutes, the phase current I a , Phase current I b and phase current I cThere are 96 measurement data respectively, the sum of 96 measurement data of each phase current, and the maximum phase current sum and the minimum phase current sum in the phase current sum are obtained. When the maximum phase current sum is 130% or more of the minimum phase current sum, it is judged that the three-phase imbalance causes overload. That is to say, the ratio of the maximum phase current sum to the minimum phase current sum is used to obtain the third ratio. After dividing the third ratio by the preset overload judgment percentage threshold of 130%, the fourth ratio is obtained, and the first integer value less than the fourth ratio is determined as the three-phase imbalance rate data.

[0112] The equivalent load ratio formula is as follows:

[0113]

[0114] Wherein, n represents the total number of three-phase current historical data within a preset period, i is the number of the measurement point within the preset period, and γ is the equivalent load ratio.

[0115] Step 206 , comparing the equivalent load ratio with a preset overload threshold, and determining whether the distribution transformer to be determined is overloaded according to the comparison result.

[0116] Optionally, step 206 may include the following sub-steps S31-S33:

[0117] Step S31, comparing the equivalent load ratio with a preset heavy load threshold.

[0118] In the embodiment of the present invention, the equivalent load ratio and the preset overload threshold are compared. In this embodiment, the preset overload threshold is selected as 1.

[0119] Step S32: If the equivalent load ratio is greater than or equal to the preset overload threshold, it is determined that the distribution transformer to be determined is overloaded.

[0120] In the embodiment of the present invention, when the result of the equivalent load ratio is greater than or equal to 1, it is determined that the distribution transformer to be determined is overloaded.

[0121] Step S33: If the equivalent load ratio is less than the preset overload threshold, it is determined that the distribution transformer to be determined is not overloaded.

[0122] In the embodiment of the present invention, when the result of the equivalent load ratio is less than 1, it is determined that the distribution transformer to be determined is not overloaded.

[0123] The present invention provides a method for determining whether a distribution transformer is overloaded, involving multiple load terminals, and the method further includes the following steps S41:

[0124] Step S41, obtaining existing three-phase current data from each load terminal according to a preset data collection interval through a metering database, and caching it as new three-phase current historical data; the load terminal is used to measure the three-phase current data of the distribution transformer in real time.

[0125] In the embodiment of the present invention, the metering database collects data at a preset data collection interval of 15 minutes per point. First, the three-phase current data of the distribution transformer within 15 minutes is obtained through the load terminal, and the average value of the three-phase current data within 15 minutes is calculated. Therefore, there are 24 hours in a day, and 96 data will be uploaded to the metering database as new three-phase current historical data, and then uploaded to the metering database through a fiber optic channel or a wireless network.

[0126] In the embodiment of the present invention, the three-phase current data of the distribution transformer is measured in real time by the load terminal.

[0127] In an embodiment of the invention, when responding to the received request information, the request information is read, and the distribution transformer corresponding to the request information is selected as the distribution transformer to be judged, and multiple three-phase current history data of the distribution transformer to be judged in a preset time period are obtained from a preset metering database, and the three-phase current history data obtained in the metering database are used to calculate the equivalent load ratio based on the three-phase current history data, and the calculated equivalent load ratio is compared with the preset overload threshold value, and the comparison result is used to judge whether the distribution transformer to be judged is overloaded, thereby solving the problem that when judging whether the distribution transformer is overloaded, the user load in the distribution network changes rapidly, and the judgment method using the prior art only considers the real-time load rate, and can only make an overload judgment at a certain moment, resulting in the inability to accurately judge whether the distribution transformer is overloaded. The present invention calculates the equivalent load ratio through multiple three-phase current history data of a preset time period, and judges whether the distribution transformer to be judged is overloaded according to the comparison result of the equivalent load ratio and the preset overload threshold value, while considering the factors of short-term or instantaneous overload and the three-phase imbalance factor, effectively improving the accuracy of judging whether the distribution transformer is overloaded.

[0128] See also Figure 3 , Figure 3 This is a structural block diagram of a device for determining whether a distribution transformer is overloaded, provided in Embodiment 3 of the present invention.

[0129] An embodiment of the present invention provides a device for determining whether a distribution transformer is overloaded, comprising:

[0130] A response selection module 301 is used to select a distribution transformer corresponding to the request information as a distribution transformer to be determined in response to the received request information;

[0131] An acquisition module 302 is used to acquire a plurality of three-phase current historical data of the distribution transformer to be determined within a preset period of time from a preset metering database;

[0132] An information processing module 303 is used to calculate an equivalent load ratio using three-phase current historical data;

[0133] The judgment module 304 is used to compare the equivalent load ratio with a preset overload threshold, and judge whether the distribution transformer to be judged is overloaded according to the comparison result.

[0134] Optionally, the information processing module 303 includes:

[0135] The actual load rate data calculation submodule is used to calculate the actual load rate data by using the maximum phase current of each phase current in the historical data of the three-phase current;

[0136] The three-phase unbalance data calculation submodule is used to generate three-phase unbalance data based on the sum calculation result of each phase current and the preset overload judgment percentage threshold;

[0137] The equivalent load ratio calculation submodule is used to calculate the sum of the actual load rate data and the three-phase unbalance rate data to obtain the equivalent load ratio.

[0138] Optionally, the actual load rate data calculation submodule includes:

[0139] The phase current maximum value acquisition submodule is used to obtain the maximum phase current value of each three-phase current historical data;

[0140] A current judgment data acquisition submodule is used to calculate a first ratio between the maximum value of each phase current and the rated current of the distribution transformer to be judged, and determine the first integer value less than the first ratio as the current judgment data;

[0141] A judgment value acquisition submodule is used to compare each current judgment data with the rated current of the distribution transformer to be judged, and generate a judgment value according to the comparison result;

[0142] The sum value data acquisition submodule is used to calculate the sum value of all judgment values ​​and obtain the sum value data;

[0143] The actual load rate data acquisition submodule is used to calculate a second ratio between the sum data and a preset overload judgment threshold, and determine the first integer value less than the second ratio as the actual load rate data.

[0144] Optionally, the judgment value acquisition submodule includes:

[0145] A judgment value determination submodule, used for comparing each current judgment data with the rated current of the distribution transformer to be judged;

[0146] If the current judgment data is greater than the rated current of the distribution transformer to be judged, the first preset judgment value is determined as the judgment value;

[0147] If the current judgment data is less than the rated current of the distribution transformer to be judged, the second preset judgment value is determined as the judgment value.

[0148] Optionally, the three-phase unbalance data calculation submodule includes:

[0149] A phase current sum value calculation submodule, used to calculate the phase current sum value of each phase current respectively;

[0150] A phase current sum value acquisition submodule is used to acquire a maximum phase current sum value and a minimum phase current sum value among the phase current sum values;

[0151] a phase current sum comparison submodule, configured to calculate a third ratio between the maximum phase current sum and the minimum phase current sum;

[0152] The three-phase unbalance rate data acquisition submodule is used to calculate a fourth ratio between the third ratio and a preset overload judgment percentage threshold, and determine the first integer value less than the fourth ratio as the three-phase unbalance rate data.

[0153] Optionally, the determination module 304 includes:

[0154] The overload judgment submodule is used to compare the equivalent load ratio with the preset overload threshold;

[0155] If the equivalent load ratio is greater than or equal to the preset overload threshold, it is determined that the distribution transformer to be determined is overloaded;

[0156] If the equivalent load ratio is less than the preset overload threshold, it is determined that the distribution transformer to be determined is not overloaded.

[0157] Optionally, involving multiple load terminals, the device further comprises:

[0158] A cache module is used to obtain existing three-phase current data from each load terminal through a metering database according to a preset data collection interval, and cache it as new three-phase current historical data;

[0159] Load terminal, used to measure the three-phase current data of distribution transformer in real time.

[0160] In an embodiment of the invention, when responding to the received request information, the request information is read, and the distribution transformer corresponding to the request information is selected as the distribution transformer to be judged, and multiple three-phase current history data of the distribution transformer to be judged in a preset time period are obtained from a preset metering database, and the three-phase current history data obtained in the metering database are used to calculate the equivalent load ratio based on the three-phase current history data, and the calculated equivalent load ratio is compared with the preset overload threshold value, and the comparison result is used to judge whether the distribution transformer to be judged is overloaded, thereby solving the problem that when judging whether the distribution transformer is overloaded, the user load in the distribution network changes rapidly, and the judgment method using the prior art only considers the real-time load rate, and can only make an overload judgment at a certain moment, resulting in the inability to accurately judge whether the distribution transformer is overloaded. The present invention calculates the equivalent load ratio through multiple three-phase current history data of a preset time period, and judges whether the distribution transformer to be judged is overloaded according to the comparison result of the equivalent load ratio and the preset overload threshold value, while considering the factors of short-term or instantaneous overload and the three-phase imbalance factor, effectively improving the accuracy of judging whether the distribution transformer is overloaded.

[0161] See also Figure 4 , Figure 4 A structural block diagram of a computer device according to an embodiment of the present invention is shown.

[0162] An electronic device according to an embodiment of the present invention includes: a memory 401 and a processor 402, wherein the memory 402 stores a computer program; when the computer program is executed by the processor 402, the processor 402 executes the method for determining whether the distribution transformer is overloaded as described in any of the above embodiments.

[0163] The memory 401 can be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk or a ROM. The memory 401 has a storage space 403 for a program code 413 for executing any method step in the above method. For example, the storage space 403 for the program code can include each program code 413 for realizing the various steps in the above method respectively. These program codes can be read from one or more computer program products or written into this one or more computer program products. These computer program products include program code carriers such as a hard disk, a compact disk (CD), a memory card or a floppy disk. The program code can be compressed, for example, in an appropriate form. These codes, when run by a computing and processing device, cause the computing and processing device to perform each step in the method described above.

[0164] An embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed, a method for determining whether a distribution transformer is overloaded according to any embodiment of the present invention is implemented.

[0165] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0166] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0167] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0168] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0169] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0170] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining whether a distribution transformer is overloaded, characterized in that: include: In response to the received request information, selecting a distribution transformer corresponding to the request information as the distribution transformer to be determined; Acquire multiple three-phase current historical data of the distribution transformer to be judged within a preset time period from a preset metering database; Calculating an equivalent load ratio using the three-phase current historical data; Comparing the equivalent load ratio with a preset overload threshold, and judging whether the distribution transformer to be judged is overloaded according to the comparison result; The step of calculating the equivalent load ratio by using the three-phase current historical data comprises: Calculate the actual load rate data by using the maximum phase current value of each phase current in the three-phase current historical data; Generate three-phase unbalance data based on the sum calculation result of each phase current and the preset overload judgment percentage threshold; Calculating the sum of the actual load rate data and the three-phase imbalance rate data to obtain an equivalent load ratio; The step of using the maximum phase current of each phase current in the three-phase current historical data to calculate the actual load rate data includes: Obtaining the maximum phase current value of each of the three-phase current historical data; Calculating a first ratio between each of the maximum values ​​of the phase current and the rated current of the distribution transformer to be judged, and determining a first integer value smaller than the first ratio as current judgment data; Comparing each of the current judgment data with the rated current of the distribution transformer to be judged, and generating a judgment value according to the comparison result; Calculate the sum of all the judgment values ​​to obtain sum data; Calculating a second ratio between the sum data and a preset overload judgment threshold, and determining a first integer value smaller than the second ratio as the actual load rate data; The step of comparing each current judgment data with the rated current of the distribution transformer to be judged and generating a judgment value according to the comparison result comprises: Comparing each of the current judgment data with the rated current of the distribution transformer to be judged; If the current judgment data is greater than the rated current of the distribution transformer to be judged, the first preset judgment value is determined as the judgment value; If the current judgment data is less than the rated current of the distribution transformer to be judged, the second preset judgment value is determined as the judgment value; The step of generating three-phase unbalance data according to the calculation result of the sum of the phase currents in combination with a preset overload judgment percentage threshold comprises: respectively calculating the phase current and value of each of the phase currents; Obtaining a maximum phase current sum value and a minimum phase current sum value among the phase current sum values; calculating a third ratio between the maximum phase current sum value and the minimum phase current sum value; A fourth ratio between the third ratio and the preset overload judgment percentage threshold is calculated, and a first integer value smaller than the fourth ratio is determined as the three-phase imbalance rate data.

2. The method for determining whether a distribution transformer is overloaded according to claim 1, characterized in that: Involving a plurality of load terminals, the method further comprises: Acquire existing three-phase current data from each load terminal through the metering database according to a preset data collection interval, and cache it as new three-phase current historical data; The load terminal is used to measure the three-phase current data of the distribution transformer in real time.

3. The method for determining whether a distribution transformer is overloaded according to claim 1, characterized in that: The step of comparing the equivalent load ratio with a preset overload threshold and judging whether the distribution transformer to be judged is overloaded according to the comparison result comprises: comparing the equivalent load ratio with a preset overload threshold; If the equivalent load ratio is greater than or equal to the preset overload threshold, it is determined that the distribution transformer to be determined is overloaded; If the equivalent load ratio is less than the preset overload threshold, it is determined that the distribution transformer to be determined is not overloaded.

4. A device for judging whether a distribution transformer is overloaded, characterized in that: include: A response selection module, configured to select, in response to the received request information, a distribution transformer corresponding to the request information as the distribution transformer to be determined; An acquisition module, used for acquiring a plurality of three-phase current historical data of the distribution transformer to be judged within a preset time period from a preset metering database; An information processing module, used for calculating an equivalent load ratio using the three-phase current historical data; A judgment module, used for comparing the equivalent load ratio with a preset overload threshold, and judging whether the distribution transformer to be judged is overloaded according to the comparison result; The information processing module includes: An actual load rate data calculation submodule, used to calculate the actual load rate data by using the maximum phase current of each phase current in the three-phase current historical data; A three-phase unbalance data calculation submodule, for generating three-phase unbalance data according to the calculation result of the sum of the phase currents and a preset overload judgment percentage threshold; An equivalent load ratio calculation submodule, used to calculate the sum of the actual load rate data and the three-phase unbalance rate data to obtain an equivalent load ratio; The actual load rate data calculation submodule includes: A phase current maximum value acquisition submodule, used to acquire the phase current maximum value of each of the three-phase current historical data; A current judgment data acquisition submodule, used for calculating a first ratio between the maximum value of each phase current and the rated current of the distribution transformer to be judged, and determining a first integer value less than the first ratio as the current judgment data; A judgment value acquisition submodule, used for comparing each current judgment data with the rated current of the distribution transformer to be judged, and generating a judgment value according to the comparison result; A sum value data acquisition submodule, used for calculating the sum value of all the judgment values ​​to obtain the sum value data; an actual load rate data acquisition submodule, used for calculating a second ratio between the sum data and a preset overload judgment threshold, and determining a first integer value less than the second ratio as the actual load rate data; The judgment value acquisition submodule includes: A judgment value determination submodule, used for comparing each current judgment data with the rated current of the distribution transformer to be judged; If the current judgment data is greater than the rated current of the distribution transformer to be judged, the first preset judgment value is determined as the judgment value; If the current judgment data is less than the rated current of the distribution transformer to be judged, the second preset judgment value is determined as the judgment value; The three-phase unbalanced data calculation submodule includes: A phase current sum value calculation submodule, used for respectively calculating the phase current sum value of each phase current; A phase current sum value acquisition submodule, used to acquire a maximum phase current sum value and a minimum phase current sum value among the phase current sum values; a phase current sum comparison submodule, configured to calculate a third ratio between the maximum phase current sum and the minimum phase current sum; The three-phase unbalance rate data acquisition submodule is used to calculate a fourth ratio between the third ratio and the preset overload judgment percentage threshold, and determine the first integer value less than the fourth ratio as the three-phase unbalance rate data.

5. An electronic device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method for determining whether a distribution transformer is overloaded as described in any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the method for determining whether a distribution transformer is overloaded as described in any one of claims 1 to 3 is implemented.

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