Power failure level determination method and device, storage medium and electronic device

Abstract

The application discloses a power failure level discrimination method and device, a storage medium and an electronic device, relates to the power field, and mainly aims to the problem that due to the need of metering personnel to perform wiring operation in the live metering circuit, there is the risk of electric shock injury, and the operation of the circuit may also be affected, thereby causing the risk of large-area power grid blackout accident. The method comprises the following steps: acquiring electric energy data of each phase of a current circuit, and generating a power failure discrimination result of the current circuit based on the electric energy data; if the power failure discrimination result is a failure, calculating the current phasor vector sum of each phase based on a preset algorithm according to the electric energy data; and generating a power failure level discrimination result of the current circuit according to the relative error between the calculation value and the measured value of the load current vector sum of each phase.

Description

Technical Field

[0001] This application relates to the field of power, and in particular to a method and apparatus for determining the level of power failure, a storage medium, and electronic equipment. Background Technology

[0002] Electricity is an essential element in people's lives. To ensure normal electricity use, it is necessary to constantly monitor the electrical status of the circuit. It should be noted that not all abnormal electrical statuses require circuit repair. For example, when a minor fault occurs in the circuit, the manifestation may still be a significant imbalance in the three-phase current. However, this may only be caused by an unbalanced load in the circuit and does not require circuit repair. Therefore, it is necessary to determine the level of electrical fault.

[0003] Currently, the existing method for determining the level of power outages requires metering personnel to conduct on-site inspections. However, this requires metering personnel to perform wiring operations on live metering circuits, posing a risk of electric shock and potentially affecting circuit operation, thereby increasing the risk of large-scale power outages. Summary of the Invention

[0004] In view of this, this application provides a method and device for determining the level of power failure, a storage medium, and an electronic device. The main purpose is to address the problem that existing metering operations require metering personnel to perform wiring operations on live metering circuits, which pose a risk of electric shock and may also affect the operation of the circuit, thereby causing a large-scale power outage.

[0005] According to one aspect of this application, a method for determining the level of electrical faults is provided, comprising:

[0006] Acquire the power data of each phase contained in the current circuit, and generate the power failure judgment result of the current circuit based on the power data;

[0007] If the power fault determination result is that a fault has occurred, then based on the preset algorithm, the calculated value of the current phasor vector sum of each phase is calculated according to the power data;

[0008] Based on the relative error between the calculated value and the measured value of the load current vector sum of each phase, a power fault level judgment result for the current circuit is generated.

[0009] Preferably, if the power fault determination result indicates a fault has occurred, then based on a preset algorithm, the calculated value of the current phasor vector sum of each phase is calculated according to the power data, specifically including:

[0010] Based on the parallelogram principle, calculate the vector sum of current phasors between the current phasors of the first phase and the current phasors of the second phase;

[0011] Based on the parallelogram principle, calculate the first angle between the current phasor of the first phase and the vector sum of the current phasors;

[0012] Based on the parallelogram principle, the second angle between the current phasor of the third phase and the vector sum of the current phasors is calculated according to the first included angle.

[0013] Based on the cosine theorem, the sum of the current phasor vectors of each phase is calculated according to the second included angle, and the calculated value of the sum of the current phasor vectors of each phase is obtained.

[0014] Preferably, before calculating the current phasor vector sum between the current phasors of the first phase and the current phasors of the second phase based on the parallelogram principle, the method further includes:

[0015] The inverse cosine function value of each power factor is calculated based on the power factor in the power data of each phase, and the angle value of the voltage leading the current of each phase is obtained.

[0016] Based on the angle value, the current phasor corresponding to each phase is generated.

[0017] Preferably, the current circuit is a positive phase sequence circuit, and before generating the current phasors corresponding to each phase based on the angle value, the method further includes:

[0018] Based on the positive phase sequence circuit, the voltage phasors corresponding to each phase are generated.

[0019] Preferably, the step of generating the power failure level judgment result of the current circuit based on the relative error between the calculated value and the measured value of the load current vector sum of each phase specifically includes:

[0020] If the relative error is greater than or equal to the first error threshold, then the power failure level of the current circuit is determined to be severe.

[0021] If the relative error is greater than or equal to the second error threshold and less than the first error threshold, then the power failure level of the current circuit is classified as general.

[0022] If the relative error is greater than or equal to the third error threshold and less than the second error threshold, then the power failure level of the current circuit is determined to be minor.

[0023] Preferably, before generating the power failure level determination result of the current circuit based on the relative error between the calculated value and the measured value of the load current vector sum of each phase, the method further includes:

[0024] Calculate the difference between the calculated value and the measured value of the load current vector sum of each phase;

[0025] The absolute value transformation is performed on the quotient between the difference and the measured value to obtain the relative error between the calculated value and the measured value of the load current vector sum of each phase.

[0026] Preferably, the step of acquiring the power data of each phase included in the current circuit and generating a power fault judgment result of the current circuit based on the power data specifically includes:

[0027] Collect multiple sets of electrical energy data for each phase of the current circuit within a preset time period according to a preset time interval;

[0028] If, among the multiple sets of electrical energy data, the number of sets of electrical energy data that meet the preset power failure judgment criteria exceeds the preset threshold, then the power failure judgment result of the current circuit is that a failure has occurred.

[0029] Otherwise, the current circuit's power failure determination result is that no failure has occurred.

[0030] According to another aspect of this application, a device for determining the level of electrical faults is provided, comprising:

[0031] The first discrimination module is used to acquire the power data of each phase contained in the current circuit, and generate the power failure discrimination result of the current circuit based on the power data;

[0032] The calculation module is used to calculate the sum of the current phasor vectors of each phase based on the power data, according to a preset algorithm, if the power fault determination result is that a fault has occurred.

[0033] The second discrimination module is used to generate a power failure level discrimination result for the current circuit based on the relative error between the calculated value and the measured value of the load current vector sum of each phase.

[0034] Preferably, the calculation module is specifically used for:

[0035] Based on the parallelogram principle, calculate the vector sum of current phasors between the current phasors of the first phase and the current phasors of the second phase;

[0036] Based on the parallelogram principle, calculate the first angle between the current phasor of the first phase and the vector sum of the current phasors;

[0037] Based on the parallelogram principle, the second angle between the current phasor of the third phase and the vector sum of the current phasors is calculated according to the first included angle.

[0038] Based on the cosine theorem, the sum of the current phasor vectors of each phase is calculated according to the second included angle, and the calculated value of the sum of the current phasor vectors of each phase is obtained.

[0039] Preferably, the calculation module is further configured to:

[0040] The inverse cosine function value of each power factor is calculated based on the power factor in the power data of each phase, and the angle value of the voltage leading the current of each phase is obtained.

[0041] Based on the angle value, the current phasor corresponding to each phase is generated.

[0042] Preferably, the current circuit is a positive phase sequence circuit, and the calculation module is further used for:

[0043] Based on the positive phase sequence circuit, the voltage phasors corresponding to each phase are generated.

[0044] Preferably, the second discrimination module is specifically used for:

[0045] If the relative error is greater than or equal to the first error threshold, then the power failure level of the current circuit is determined to be severe.

[0046] If the relative error is greater than or equal to the second error threshold and less than the first error threshold, then the power failure level of the current circuit is classified as general.

[0047] If the relative error is greater than or equal to the third error threshold and less than the second error threshold, then the power failure level of the current circuit is determined to be minor.

[0048] Preferably, the second discrimination module is further used for:

[0049] Calculate the difference between the calculated value and the measured value of the load current vector sum of each phase;

[0050] The absolute value transformation is performed on the quotient between the difference and the measured value to obtain the relative error between the calculated value and the measured value of the load current vector sum of each phase.

[0051] Preferably, the first discrimination module specifically includes:

[0052] The data acquisition unit is used to acquire multiple sets of electrical energy data of each phase contained in the current circuit at preset time intervals within a preset time period.

[0053] The discrimination unit is used to determine whether, among multiple sets of power data, if the number of power data sets that meet the preset power failure discrimination criteria exceeds a preset threshold, the power failure discrimination result of the current circuit is that a fault has occurred.

[0054] The discrimination unit is also used to determine that, otherwise, the power failure discrimination result of the current circuit is that no failure has occurred.

[0055] According to another aspect of this application, a storage medium is provided, wherein at least one executable instruction is stored therein, the executable instruction causing a processor to perform an operation corresponding to the power failure level discrimination method described above.

[0056] According to another aspect of this application, an electronic device is provided, comprising: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other via the communication bus;

[0057] The memory is used to store at least one executable instruction, which causes the processor to perform the operation corresponding to the power failure level discrimination method described above.

[0058] By employing the above technical solutions, the technical solutions provided in the embodiments of this application have at least the following advantages:

[0059] This application provides a method, apparatus, storage medium, and electronic device for determining the level of electrical faults. First, it acquires the electrical energy data of each phase in the current circuit and generates a power fault determination result for the current circuit based on the electrical energy data. Second, if the power fault determination result indicates a fault has occurred, it calculates the calculated value of the current phasor vector sum of each phase based on the electrical energy data using a preset algorithm. Finally, it generates the power fault level determination result for the current circuit based on the relative error between the calculated value and the measured value of the load current vector sum of each phase. Compared with the prior art, the embodiments of this application obtain the power data of each phase of the current circuit from the three-phase four-wire smart energy meter in the circuit, and use this as a basis to determine whether a fault has occurred in the circuit. If a fault occurs, the calculated value of the current phasor vector sum of each phase is calculated based on the power data. Then, based on the deviation between the calculated value and the measured value, the power fault level of the current circuit is determined. This realizes the automatic determination of the power fault level without the need for on-site inspection and identification, reducing the risk of electric shock injury. At the same time, it avoids the possibility of on-site measurement affecting the normal operation of the circuit, thus ensuring the normal operation of the circuit.

[0060] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0061] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0062] Figure 1 A flowchart of a method for determining the level of electrical faults provided in an embodiment of this application is shown;

[0063] Figure 2 A flowchart of another method for determining the level of electrical faults provided in an embodiment of this application is shown;

[0064] Figure 3 This application illustrates a positive phase sequence voltage phasor diagram provided in an embodiment of the present application.

[0065] Figure 4 The current phasor diagram provided in the embodiments of this application is shown;

[0066] Figure 5 The present application illustrates the computational aids provided by embodiments thereof. Figure 1 ;

[0067] Figure 6 The present application illustrates the computational aids provided by embodiments thereof. Figure 2 ;

[0068] Figure 7 The present application illustrates the computational aids provided by embodiments thereof. Figure 3 ;

[0069] Figure 8 The computational aids provided in the embodiments of this application are illustrated. Figure 4 ;

[0070] Figure 9 The present application illustrates the computational aids provided by embodiments thereof. Figure 5 ;

[0071] Figure 10 A flowchart of another method for determining the level of electrical faults provided in an embodiment of this application is shown;

[0072] Figure 11 A flowchart illustrating the power fault diagnosis process provided in an embodiment of this application is shown.

[0073] Figure 12 This paper shows a block diagram of a power fault level discrimination device provided in an embodiment of this application;

[0074] Figure 13 A schematic diagram of the structure of a terminal provided in an embodiment of this application is shown. Detailed Implementation

[0075] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0076] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0077] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0078] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0079] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0080] The embodiments of this application can be applied to computer systems / servers that can operate with a wide range of other general-purpose or special-purpose computing system environments or configurations. Examples of well-known computing systems, environments, and / or configurations suitable for use with computer systems / servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments that include any of the above systems, etc.

[0081] Computer systems / servers can be described in the general context of computer system executable instructions (such as program modules) executed by the computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are performed by remote processing devices linked through a communication network. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0082] This application provides a method for determining the level of electrical faults, such as... Figure 1 As shown, the method includes:

[0083] 101. Obtain the power data of each phase in the current circuit, and generate the power fault judgment result of the current circuit based on the power data.

[0084] The electrical energy data includes voltage data, current data, power data (including active power data and reactive power data), and power factor, etc. In this embodiment, the current execution terminal can be the power system's electricity metering module, which reads the above-mentioned electrical energy data by connecting a low-voltage three-phase direct-connection smart energy meter in the circuit. Furthermore, based on the obtained electrical energy data and a preset power fault discrimination standard, it is determined whether a fault has occurred in the current circuit. For example, regarding voltage data, if the voltage specification of the current circuit is 3*220V / 380V, the power fault discrimination standard can be set to phase a 250V ≥ U. a ≥190V, phase b 250V ≥U b ≥190V, phase C 250V ≥U c ≥190V. When the voltage data is within this range, it indicates that the current circuit has a fault and the fault level needs to be further determined. Similarly, power fault judgment standards can be set for current data, power factor, and power data, and the circuit fault can be judged based on the collected power data.

[0085] It should be noted that since electrical energy data is not static but changes in real time, a threshold for the number of excessive changes can be set. That is, a certain number of sets of electrical energy data are collected evenly over a certain period of time. When the number of sets of electrical energy data that meet the fault criteria exceeds the threshold, a fault is determined to have occurred in the circuit. This can effectively avoid misjudgment of faults caused by a single unexpected change in the circuit. Compared with the method of judging faults based on a single change in electrical energy data, it can effectively reduce the probability of misjudgment, thereby reducing the number of subsequent steps triggered by misjudgment and effectively avoiding the waste of computing resources.

[0086] 102. If the power fault judgment result is that a fault has occurred, then based on the preset algorithm, the calculated value of the current phasor vector sum of each phase is calculated according to the power data.

[0087] The preset algorithm may include the parallelogram principle, the law of cosines, etc. It is understood that the fault level determination thread will only be triggered when the current circuit is determined to have a fault. In this embodiment, when the power fault determination result obtained from the power data in step 101 indicates a fault, the fault level determination thread will be automatically triggered. Based on the power data in step 101, and using the parallelogram principle, the law of cosines, etc., the current vector sum of the three phases is calculated. It should be noted that this value is the calculated value of the current vector sum of the three phases.

[0088] 103. Based on the relative error between the calculated value and the measured value of the load current vector sum of each phase, generate the power fault level judgment result of the current circuit.

[0089] The measured values ​​of the load current phasor vector sum for each phase are directly collected from low-voltage three-phase direct-connection smart energy meters. In this embodiment, the measured values ​​of the load current phasor vector sum for each phase are compared with the calculated values, and a power fault level judgment result is generated based on the degree of error.

[0090] It should be noted that the results of the power fault level assessment can be divided into severe, moderate, and minor levels. When a severe or moderate level is obtained, it indicates that there may be a current loss fault in the current circuit. At this time, the circuit needs to be repaired to restore the normal power supply. When a minor level is obtained, it indicates that the current imbalance may be caused by an unbalanced load in the circuit. In this case, further assessment is needed to determine whether the current circuit needs to be repaired.

[0091] Compared with the prior art, the embodiments of this application obtain the power data of each phase of the current circuit from the three-phase four-wire smart energy meter in the circuit, and use this as a basis to determine whether a fault has occurred in the circuit. If a fault occurs, the calculated value of the current phasor vector sum of each phase is calculated based on the power data. Then, based on the deviation between the calculated value and the measured value, the power fault level of the current circuit is determined. This realizes the automatic determination of the power fault level without the need for on-site inspection and identification, reducing the risk of electric shock injury. At the same time, it avoids the possibility of on-site measurement affecting the normal operation of the circuit, thus ensuring the normal operation of the circuit.

[0092] This application provides another method for determining the level of electrical faults, such as... Figure 2 As shown, the method includes:

[0093] 201. Based on the positive phase sequence circuit, generate the voltage phasors corresponding to each phase.

[0094] The current circuit is a positive phase sequence circuit. In this embodiment, when the smart meter displays the positive phase sequence circuit, it uses... Generate positive phase sequence voltage phasor diagrams sequentially, such as Figure 3 As shown, the angle between the voltage vectors of each phase is 120°.

[0095] 202. Calculate the inverse cosine function value of each power factor based on the power factor in the power data of each phase, and obtain the angle value of the voltage leading the current of each phase.

[0096] 203. Generate the current phasors corresponding to each phase based on the angle value.

[0097] In this embodiment, voltage phasors of phase a are used respectively. Use this as a benchmark to determine the measured value. The voltage vector of phase b Use this as a benchmark to determine the measured value. voltage phasors of phase c Use this as a benchmark to determine the measured value.

[0098] Specifically, firstly, based on the power factor X of phase a obtained in step 101 of the embodiment... a Calculate its inverse cosine function value. Then, based on the sign of the power factor (P is known when obtaining the electrical energy data in step 101 of the embodiment), a >0, Q a >0), therefore the inverse cosine function value is positive, i.e. Obtain the angle value of the phase voltage leading the current. At this time, with Based on the reference, rotate clockwise That is, to obtain the current phasor of phase a. Similarly, based on the power factor X of phase b... b Calculate its inverse cosine function value. Then, based on the sign of the power factor (P) b >0, Q b >0), therefore the inverse cosine function value is positive, i.e. Obtain the angle value of the phase b voltage leading the current. At this time, with Based on the reference, rotate clockwise That is, to obtain the current phasor of phase b. Based on the power factor X of phase c c Calculate its inverse cosine function value. Then, based on the sign of the power factor (P) c >0, Q c >0), therefore the inverse cosine function value is positive, i.e. Obtain the angle value of the voltage leading the current of phase c. At this time, with Based on the reference, rotate clockwise That is, to obtain the current phasor of phase c. Finally, the current phasor diagrams for each phase are generated, such as... Figure 4 As shown.

[0099] 204. Based on the parallelogram principle, calculate the vector sum between the current phasors of the first phase and the current phasors of the second phase.

[0100] 205. Based on the parallelogram principle, calculate the first angle between the current phasor of the first phase and the vector sum of the current phasors.

[0101] In the embodiments of this application, such as Figure 5 As shown, firstly, based on the parallelogram principle, ... Translate to Connect the beginning and the end, then connect them. and The other end is the beginning and end, thus obtaining the vector sum between the current phasors of the first phase and the current phasors of the second phase. Furthermore, Compared with the translation The included angle between them is denoted as α1. According to the parallelogram principle, we know that... and, After further changes, we arrive at... I b 2 =I a 2 +(I a+I b ) 2 -2I a (I a +I b cosβ, Among them, I a Represents current phasor The value of I b Represents current phasor Furthermore, assuming cosβ = x, if cosβ > 0, i.e. x > 0, then β = arccosx, 90° > β > 0°; if cosβ < 0, i.e. x < 0, then β = arccosx, 180° > β > 90°, where β represents the first included angle.

[0102] 206. Based on the parallelogram principle, calculate the second angle between the current phasor of the third phase and the current phasor vector sum according to the first included angle.

[0103] 207. Based on the cosine theorem, calculate the sum of the current phasor vectors of each phase according to the second included angle, and obtain the calculated value of the sum of the current phasor vectors of each phase.

[0104] In this application embodiment, there are four cases: 1) 90°>φ a +β>0° and 60°>φ c >30°, such as Figure 6 As shown, according to the parallelogram principle, the second angle between the current phasor of the third phase and the current phasor vector sum is denoted as α2. Furthermore, based on the law of cosines,

[0105] Among them, I′ n This represents the calculated value of the vector sum of the current phasors for each phase.

[0106] 2) 60°>φ a +β>0° and 30°>φ c >0°, such as Figure 7 As shown, according to the parallelogram principle, the second angle between the current phasor of the third phase and the current phasor vector sum is... Furthermore, based on the law of cosines,

[0107]

[0108] Among them, I′ n This represents the calculated value of the vector sum of the current phasors for each phase.

[0109] 3) 180 > φ a +β>90 and 30>φ c >0, such as Figure 8As shown, according to the parallelogram principle, the second angle between the current phasor of the third phase and the current phasor vector sum is... Furthermore, based on the law of cosines,

[0110]

[0111] Among them, I′ n This represents the calculated value of the vector sum of the current phasors for each phase.

[0112] 4) 180° > φ a +β>120° and 60°>φ c >30°, such as Figure 9 As shown, according to the parallelogram principle, the second angle between the current phasor of the third phase and the current phasor vector sum is... Furthermore, based on the law of cosines,

[0113]

[0114] Among them, I′ n This represents the calculated value of the vector sum of the current phasors for each phase.

[0115] In one embodiment of this application, for further definition and explanation, such as Figure 10 As shown, step 103 of the embodiment generates a power fault level judgment result for the current circuit based on the relative error between the calculated value and the measured value of the load current vector sum of each phase, specifically including:

[0116] 301. Calculate the difference between the calculated value and the measured value of the load current vector sum of each phase; perform absolute value transformation on the quotient between the difference and the measured value to obtain the relative error between the calculated value and the measured value of the load current vector sum of each phase.

[0117] In this embodiment, the relative error between the measured and calculated values ​​of the current phasor vector sum of each phase can be expressed as: Among them, I′ n Indicates the calculated value, I n This represents the measured value of the vector sum of the three-phase load currents.

[0118] 302. If the relative error is greater than or equal to the first error threshold, the current circuit's power failure level is determined to be severe; if the relative error is greater than or equal to the second error threshold and less than the first error threshold, the current circuit's power failure level is determined to be moderate; if the relative error is greater than or equal to the third error threshold and less than the second error threshold, the current circuit's power failure level is determined to be minor.

[0119] In this embodiment of the application, the first error threshold can be set to 20%, the second error threshold to 10%, and the third error threshold to 5%. At that time, the power outage level was severe; when At that time, the power outage level is classified as general; when At that time, the power outage level was minor.

[0120] In one embodiment of this application, for further definition and explanation, such as Figure 11 As shown, step 101 of the embodiment obtains the power data of each phase contained in the current circuit, and generates the power consumption fault judgment result of the current circuit based on the power data, specifically including:

[0121] 401. Collect multiple sets of electrical energy data of each phase contained in the current circuit at preset time intervals within a preset duration.

[0122] 402a. If the number of power data sets that meet the preset power failure judgment criteria exceeds the preset threshold number among multiple sets of power data, then the power failure judgment result of the current circuit is that a failure has occurred.

[0123] 402b. Otherwise, the current circuit's power failure determination result is that no failure has occurred.

[0124] The preset duration can be 1 day, 1 week, etc.; the preset time interval can be 1 hour, 15 minutes, etc.; the preset threshold for the number of data sets can be 30% or 25% of the number of data sets collected within the current duration, etc. In this embodiment, for example, energy data can be collected once at the top of each hour within a day, resulting in 24 sets of energy data. If the number of energy data sets meeting the preset fault detection criteria exceeds the preset threshold (e.g., 24 * 25% = 6 sets), then the current circuit is determined to be faulty; otherwise, it is determined that no fault has occurred. Optionally, to improve detection accuracy, energy data can also be collected once every 15 minutes within a day, resulting in 96 sets of energy data. If the number of energy data sets meeting the preset fault detection criteria exceeds the preset threshold (e.g., 96 * 25% = 24 sets), then the current circuit is determined to be faulty; otherwise, it is determined that no fault has occurred.

[0125] It should be noted that the preset power fault detection criteria can be configured for different categories of electrical data. For example, for voltage data, if the current circuit voltage specification is 3*220V / 380V, the power fault detection criterion can be set to phase a 250V≥U a ≥190V, phase b 250V ≥U b ≥190V, phase C 250V ≥U c≥190V indicates a circuit fault; for current data, the fault criterion can be set to phase a I. a ≥0.2A, b phase I b ≥0.2A, c-phase I c ≥0.2A; Regarding the power factor, the fault diagnosis standard can be set to phase a. phase b c phase For power data, the standard for judging power faults can be set as the active power data P of phase a. a >0.002kW, reactive power data Q a >0.002kvar, active power data of phase b P b >0.002kW, reactive power data Q b >0.002kvar, active power data of phase c P c >0.002kW, reactive power data Q c >0.002kvar.

[0126] This application provides a method for determining the level of electrical faults. First, the power data of each phase in the current circuit is acquired, and a power fault determination result of the current circuit is generated based on the power data. Second, if the power fault determination result indicates that a fault has occurred, the calculated value of the current phasor vector sum of each phase is calculated based on the power data using a preset algorithm. Finally, the power fault level determination result of the current circuit is generated based on the relative error between the calculated value and the measured value of the load current vector sum of each phase. Compared with the prior art, the embodiments of this application obtain the power data of each phase of the current circuit from the three-phase four-wire smart energy meter in the circuit, and use this as a basis to determine whether a fault has occurred in the circuit. If a fault occurs, the calculated value of the current phasor vector sum of each phase is calculated based on the power data. Then, based on the deviation between the calculated value and the measured value, the power fault level of the current circuit is determined. This realizes the automatic determination of the power fault level without the need for on-site inspection and identification, reducing the risk of electric shock injury. At the same time, it avoids the possibility of on-site measurement affecting the normal operation of the circuit, thus ensuring the normal operation of the circuit.

[0127] Furthermore, as a response to the above Figure 1 The implementation of the method shown in this application provides a device for determining the level of electrical faults, such as... Figure 12 As shown, the device includes:

[0128] First discrimination module 51, calculation module 52, second discrimination module 53.

[0129] The first discrimination module 51 is used to acquire the power data of each phase contained in the current circuit, and generate the power failure discrimination result of the current circuit based on the power data.

[0130] Calculation module 52 is used to calculate the calculated value of the current phasor vector sum of each phase based on the power data according to a preset algorithm if the power fault judgment result is that a fault has occurred.

[0131] The second discrimination module 53 is used to generate a power failure level discrimination result for the current circuit based on the relative error between the calculated value and the measured value of the load current vector sum of each phase.

[0132] Preferably, the calculation module is specifically used for:

[0133] Based on the parallelogram principle, calculate the vector sum of current phasors between the current phasors of the first phase and the current phasors of the second phase;

[0134] Based on the parallelogram principle, calculate the first angle between the current phasor of the first phase and the vector sum of the current phasors;

[0135] Based on the parallelogram principle, the second angle between the current phasor of the third phase and the vector sum of the current phasors is calculated according to the first included angle.

[0136] Based on the cosine theorem, the sum of the current phasor vectors of each phase is calculated according to the second included angle, and the calculated value of the sum of the current phasor vectors of each phase is obtained.

[0137] Preferably, the calculation module is further configured to:

[0138] The inverse cosine function value of each power factor is calculated based on the power factor in the power data of each phase, and the angle value of the voltage leading the current of each phase is obtained.

[0139] Based on the angle value, the current phasor corresponding to each phase is generated.

[0140] Preferably, the current circuit is a positive phase sequence circuit, and the calculation module is further used for:

[0141] Based on the positive phase sequence circuit, the voltage phasors corresponding to each phase are generated.

[0142] Preferably, the second discrimination module is specifically used for:

[0143] If the relative error is greater than or equal to the first error threshold, then the power failure level of the current circuit is determined to be severe.

[0144] If the relative error is greater than or equal to the second error threshold and less than the first error threshold, then the power failure level of the current circuit is classified as general.

[0145] If the relative error is greater than or equal to the third error threshold and less than the second error threshold, then the power failure level of the current circuit is determined to be minor.

[0146] Preferably, the second discrimination module is further used for:

[0147] Calculate the difference between the calculated value and the measured value of the load current vector sum of each phase;

[0148] The absolute value transformation is performed on the quotient between the difference and the measured value to obtain the relative error between the calculated value and the measured value of the load current vector sum of each phase.

[0149] Preferably, the first discrimination module specifically includes:

[0150] The data acquisition unit is used to acquire multiple sets of electrical energy data of each phase contained in the current circuit at preset time intervals within a preset time period.

[0151] The discrimination unit is used to determine whether, among multiple sets of power data, if the number of power data sets that meet the preset power failure discrimination criteria exceeds a preset threshold, the power failure discrimination result of the current circuit is that a fault has occurred.

[0152] The discrimination unit is also used to determine that, otherwise, the power failure discrimination result of the current circuit is that no failure has occurred.

[0153] This application provides a device for determining the level of electrical faults. First, it acquires the electrical energy data of each phase in the current circuit and generates a power fault determination result for the current circuit based on the electrical energy data. Second, if the power fault determination result indicates that a fault has occurred, it calculates the calculated value of the current phasor vector sum of each phase based on the electrical energy data using a preset algorithm. Finally, it generates a power fault level determination result for the current circuit based on the relative error between the calculated value and the measured value of the load current vector sum of each phase. Compared with the prior art, the embodiments of this application obtain the power data of each phase of the current circuit from the three-phase four-wire smart energy meter in the circuit, and use this as a basis to determine whether a fault has occurred in the circuit. If a fault occurs, the calculated value of the current phasor vector sum of each phase is calculated based on the power data. Then, based on the deviation between the calculated value and the measured value, the power fault level of the current circuit is determined. This realizes the automatic determination of the power fault level without the need for on-site inspection and identification, reducing the risk of electric shock injury. At the same time, it avoids the possibility of on-site measurement affecting the normal operation of the circuit, thus ensuring the normal operation of the circuit.

[0154] According to one embodiment of this application, a storage medium is provided, the storage medium storing at least one executable instruction, which can execute the power failure level discrimination method in any of the above method embodiments.

[0155] Based on this understanding, the technical solution of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, or portable hard drive) and includes several instructions to cause an electronic device (such as a personal computer, server, or network device) to execute the methods described in the various implementation scenarios of this application.

[0156] Figure 13 The diagram shows a schematic of an electronic structure according to one embodiment of the present application. The specific embodiments of the present application do not limit the specific implementation of the terminal.

[0157] like Figure 13 As shown, the computer device may include: a processor 602, a communications interface 604, a memory 606, and a communications bus 608.

[0158] The processor 602, communication interface 604, and memory 606 communicate with each other via communication bus 608.

[0159] Communication interface 604 is used to communicate with other network elements such as clients or other servers.

[0160] The processor 602 is used to execute program 610, which can specifically execute the relevant steps in the above-described embodiment of the method for determining the level of power failure.

[0161] Specifically, program 610 may include program code that includes computer operation instructions.

[0162] Processor 602 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application. The computer device includes one or more processors, which may be processors of the same type, such as one or more CPUs; or they may be processors of different types, such as one or more CPUs and one or more ASICs.

[0163] Memory 606 is used to store program 610. Memory 606 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0164] Specifically, program 610 can be used to cause processor 602 to perform the following operations:

[0165] Acquire the power data of each phase contained in the current circuit, and generate the power failure judgment result of the current circuit based on the power data;

[0166] If the power fault determination result is that a fault has occurred, then based on the preset algorithm, the calculated value of the current phasor vector sum of each phase is calculated according to the power data;

[0167] Based on the relative error between the calculated value and the measured value of the load current vector sum of each phase, a power fault level judgment result for the current circuit is generated.

[0168] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the physical device for determining the aforementioned power fault levels, supporting the operation of information processing programs and other software and / or programs. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0169] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0170] The methods and systems of this application may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of this application are not limited to the order specifically described above, unless otherwise specifically stated. Furthermore, in some embodiments, this application may also be implemented as a program recorded on a recording medium, the program including machine-readable instructions for implementing the methods according to this application. Thus, this application also covers recording media storing programs for performing the methods according to this application.

[0171] Obviously, those skilled in the art should understand that the modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this application is not limited to any particular combination of hardware and software.

[0172] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method of discriminating a power failure level, characterized by, The method comprises: obtaining power data of each phase included in the current circuit, and generating a power failure discrimination result of the current circuit based on the power data; if the power failure discrimination result is a failure, calculating a calculation value of a current phasor vector sum of each phase based on a preset algorithm according to the power data; generating a power failure level discrimination result of the current circuit according to a relative error between the calculation value and a measured value of a load current vector sum of each phase, wherein the power failure level discrimination result is one of a serious level, a general level and a slight level; if the power failure discrimination result is a failure, calculating a calculation value of a current phasor vector sum of each phase based on a preset algorithm according to the power data, specifically comprising: calculating a current phasor vector sum between a current phasor of a first phase and a current phasor of a second phase based on a parallelogram principle; calculating a first included angle between the current phasor of the first phase and the current phasor vector sum based on the parallelogram principle; calculating a second included angle between a current phasor of a third phase and the current phasor vector sum according to the first included angle based on the parallelogram principle; calculating the current phasor vector sum of each phase according to the second included angle based on the cosine theorem, to obtain the calculation value of the current phasor vector sum of each phase, wherein there are four cases, 1) and , according to the parallelogram principle, the second included angle between the third-phase current phasor and the vector sum of the current phasors is represented as , , based on the cosine theorem, ， wherein represents a calculated value of the sum of the current phasor vectors of the respective phases, represents an angle value of the a-phase voltage leading current, represents a first angle, represents an angle value of the c-phase voltage leading current, represents an arc sine function value of the power factor of the c-phase, represents an arc sine function value of the power factor of the a-phase, represents an a-phase current value, represents a b-phase current value, represents a c-phase current; 2) and , according to the parallelogram principle, a second included angle between the third-phase current phasor and the sum of the current phasors , based on the cosine theorem, wherein, denotes the calculated value of the sum of the current phasor vectors of the individual phases; 3) and , according to the parallelogram principle, a second included angle between the third-phase current phasor and the sum of the current phasors , based on the cosine theorem, wherein denotes the calculated value of the sum of the current phasor vectors of the individual phases; 4) and , according to the parallelogram principle, a second included angle between the third-phase current phasor and the sum of the current phasors , based on the cosine theorem, wherein denotes the calculated value of the sum of the current phasor vectors of the individual phases.

2. The method of claim 1, wherein, before the calculation of the current phasor vector sum between the current phasor of the first phase and the current phasor of the second phase based on the parallelogram principle, the method further comprises: calculating an inverse cosine function value of each power factor according to a power factor in the power data of each phase, to obtain an angle value of a voltage leading current of each phase; generating a current phasor corresponding to each phase based on the angle value.

3. The method of claim 2, wherein, Before the generation of the current phasor corresponding to each phase based on the angle value, the method further comprises: generating a voltage phasor corresponding to each phase based on a positive phase sequence circuit.

4. The method of claim 1, wherein, The generation of the power failure level discrimination result of the current circuit according to the relative error between the calculation value and the measured value of the load current vector sum of each phase, specifically comprises: if the relative error is greater than or equal to a first error threshold, the power failure level discrimination result of the current circuit is the serious level; if the relative error is greater than or equal to a second error threshold and less than the first error threshold, the power failure level discrimination result of the current circuit is the general level; if the relative error is greater than or equal to a third error threshold and less than the second error threshold, the power failure level discrimination result of the current circuit is the slight level.

5. The method according to any of claims 1 or 4, characterized in that, Before the generation of the power failure level discrimination result of the current circuit according to the relative error between the calculation value and the measured value of the load current vector sum of each phase, the method further comprises: calculating a difference value between the calculation value and the measured value of the load current vector sum of each phase; The absolute value transformation is performed on the quotient value between the difference value and the measurement value, to obtain a relative error between the calculation value of the current phase vector sum of each phase and the measurement value of the current phase vector sum of each phase.

6. The method of claim 1, wherein, The power data of each phase included in the current circuit is obtained, and a power failure discrimination result of the current circuit is generated based on the power data, specifically including: In a preset time length, a plurality of groups of power data of each phase included in the current circuit are collected at a preset time interval; In the plurality of groups of power data, if the number of power data groups reaching a preset power failure discrimination standard exceeds a preset group number threshold, the power failure discrimination result of the current circuit is that a failure occurs; Otherwise, the power failure discrimination result of the current circuit is that no failure occurs.

7. A device for determining the level of electrical faults, characterized in that, Including: The first discrimination module is configured to obtain power data of each phase included in the current circuit, and generate a power failure discrimination result of the current circuit based on the power data; The calculation module is configured to, if the power failure discrimination result is that a failure occurs, calculate a calculation value of the current phase vector sum of each phase based on a preset algorithm according to the power data; The second discrimination module is configured to generate a power failure level discrimination result of the current circuit according to a relative error between the calculation value and a measurement value of the load current vector sum of each phase, wherein the power failure level discrimination result is one of a serious level, a general level and a slight level; The calculation module is specifically configured to: Calculate a current phase vector sum between a current phase of a first phase and a current phase of a second phase based on the parallelogram principle; Calculate a first included angle between the current phase of the first phase and the current phase vector sum based on the parallelogram principle; Calculate a second included angle between a current phase of a third phase and the current phase vector sum according to the first included angle based on the parallelogram principle; Calculate the current phase vector sum of each phase according to the second included angle based on the cosine theorem, to obtain the calculation value of the current phase vector sum of each phase, wherein there are four cases, 1) and , according to the parallelogram principle, the second included angle between the third-phase current phasor and the vector sum of the current phasors is represented as , , based on the cosine theorem, ， wherein represents a calculated value of the sum of the current phasor vectors of the respective phases, represents an angle value of the a-phase voltage leading current, represents a first angle, represents an angle value of the c-phase voltage leading current, represents a value of the inverse cosine function of the power factor of the c-phase, represents a value of the inverse cosine function of the power factor of the a-phase, represents an a-phase current value, represents a b-phase current value, represents a c-phase current; 2) and a second included angle between the third-phase current phasor and the vector sum of the current phasors, according to the parallelogram principle based on the cosine theorem, wherein, denotes the calculated value of the sum of the current phasor vectors of the individual phases; 3) and , according to the parallelogram principle, a second included angle between the third-phase current phasor and the sum of the current phasors , based on the cosine theorem, wherein denotes the calculated value of the sum of the current phasor vectors of the individual phases; 4) and , according to the parallelogram principle, a second included angle between the third-phase current phasor and the sum of the current phasors , based on the cosine theorem, wherein denotes the calculated value of the sum of the current phasor vectors of the individual phases.

8. A storage medium having stored therein at least one executable instruction, characterized in that, The executable instructions cause the processor to perform operations corresponding to the power failure level discrimination method of any one of claims 1-6.

9. An electronic device comprising: The processor, the memory, the communication interface and the communication bus complete communication among each other through the communication bus; The memory is used to store at least one executable instruction, and the executable instructions cause the processor to perform operations corresponding to the power failure level discrimination method of any one of claims 1-6.

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