Phase sequence correction method and device, nonvolatile storage medium and electronic equipment

Abstract

The application discloses a phase sequence correction method and device, a nonvolatile storage medium and an electronic device. The method comprises the following steps: obtaining current load data of a target cable in an initial phase sequence condition; determining cable sheath currents of the target cable in a plurality of first candidate phase sequence conditions based on the current load data; determining target probabilities corresponding to the plurality of first candidate phase sequences according to the cable sheath currents of the target cable in the plurality of first candidate phase sequence conditions; determining a phase sequence with the maximum target probability in the plurality of first candidate phase sequences as a target phase sequence; and correcting the initial phase sequence of the target cable to the target phase sequence, wherein a sheath ground current of the target cable adopting the target phase sequence is smaller than a sheath ground current of the target cable adopting the initial phase sequence. The application solves the technical problem of excessive sheath current caused by an unideal cable phase sequence selection in the related art.

Description

Technical Field

[0001] This application relates to the field of power systems, and more specifically, to a phase sequence correction method, apparatus, non-volatile storage medium, and electronic device. Background Technology

[0002] With the continuous development of power systems, cable lines are playing an increasingly important role. Cable sheaths are subjected to electromagnetic fields of varying directions and intensities, resulting in sheath current. As the voltage levels of power systems and the transmission capacity of transmission lines increase, so too does the sheath current. Excessive sheath current can damage the metallic sheath, reduce cable lifespan, and affect the safe operation of the power system. The cable phase sequence directly influences the distribution and magnitude of the sheath current; therefore, optimizing the phase sequence can reduce it. However, in related technologies, the selection and optimization of the cable phase sequence relies heavily on the experience and intuition of personnel, which is time-consuming, labor-intensive, and prone to design deviations. This makes it difficult to accurately optimize the phase sequence, leading to problems such as excessive sheath current caused by unsatisfactory phase sequence selection.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This application provides a phase sequence correction method, apparatus, non-volatile storage medium, and electronic device to at least solve the technical problem of excessive sheath current caused by unsatisfactory cable phase sequence selection in related technologies.

[0005] According to one aspect of the embodiments of this application, a phase sequence correction method is provided, comprising: acquiring current load data of a target cable under an initial phase sequence; determining, based on the current load data, the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequence conditions; determining, according to the cable sheath current corresponding to the target cable under the predetermined plurality of first candidate phase sequence conditions, a target probability corresponding to each of the plurality of first candidate phase sequence conditions, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used; determining the phase sequence with the highest target probability among the plurality of first candidate phase sequences as the target phase sequence; and correcting the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence.

[0006] Optionally, based on current load data, the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequence conditions is determined, including: determining the inductance parameters corresponding to the target cable under a plurality of first candidate phase sequence conditions based on current frequency and earth equivalent loop depth, wherein earth equivalent loop depth represents the earth's response characteristics to the current in the target cable at current frequency; and obtaining the cable sheath current corresponding to the plurality of first candidate phase sequences according to the current load data, the inductance parameters corresponding to the plurality of first candidate phase sequences, and the configuration of the target cable.

[0007] Optionally, the inductance parameters include cable self-inductance and cable mutual inductance. Based on the current load data, the inductance parameters corresponding to the multiple first candidate phase sequences, and the configuration of the target cable, the cable sheath current corresponding to the multiple first candidate phase sequences is obtained, including: obtaining the cable sheath impedance corresponding to the multiple first candidate phase sequences based on the cable self-inductance; determining the induced electromotive force of the conductor corresponding to the multiple first candidate phase sequences based on the cable mutual inductance and the current load data; and determining the cable sheath current corresponding to the multiple first candidate phase sequences according to the configuration, the cable sheath impedance, and the induced electromotive force of the conductor.

[0008] Optionally, the cable sheath current includes the single-phase sheath current corresponding to each of the three phases in the target cable. Based on the cable sheath current corresponding to each of the predetermined multiple first candidate phase sequences, the target probability corresponding to each of the multiple first candidate phase sequences is determined. This includes: for one of the multiple first candidate phase sequences, determining the maximum sheath current among the single-phase sheath currents corresponding to each of the three phases under that candidate phase sequence; determining the target probability corresponding to a candidate phase sequence based on the maximum sheath current; and determining the target probability corresponding to each of the multiple first candidate phase sequences by using the method of determining the target probability corresponding to a candidate phase sequence.

[0009] Optionally, the method further includes: if there are multiple phase sequences with the highest target probability among multiple first candidate phase sequences, then designate the multiple phase sequences with the highest target probability as multiple second candidate phase sequences; determine the heating power corresponding to each of the multiple second candidate phase sequences based on the cable sheath current and AC resistance corresponding to the target cable; and determine the phase sequence with the lowest heating power among the multiple second candidate phase sequences as the target phase sequence.

[0010] Optionally, the method further includes: determining multiple third candidate phase sequences; determining the effective current value of the target cable under the multiple third candidate phase sequences respectively; removing the phase sequences with the same effective current value from the multiple third candidate phase sequences to obtain multiple first candidate phase sequences.

[0011] Optionally, the method further includes: acquiring three-dimensional spatial data and texture data of the target cable; rendering based on the three-dimensional spatial data and texture data to obtain a simulation structure of the target cable; and visually annotating the simulation structure according to the configuration of the target cable and using the target phase sequence.

[0012] According to another aspect of the embodiments of this application, a phase sequence correction device is provided, comprising: a current load data acquisition module, configured to acquire current load data of a target cable under an initial phase sequence condition; a cable sheath current determination module, configured to determine, based on the current load data, the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequence conditions; a target probability determination module, configured to determine the target probability corresponding to the plurality of first candidate phase sequences according to the cable sheath current corresponding to the target cable under the predetermined plurality of first candidate phase sequence conditions, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used; a target phase sequence determination module, configured to determine the phase sequence with the highest target probability among the plurality of first candidate phase sequences as the target phase sequence; and an initial phase sequence correction module, configured to correct the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence.

[0013] According to another aspect of the embodiments of this application, a non-volatile storage medium is provided, which stores a plurality of instructions, any one of which is a phase sequence correction method that is loaded by a processor and executed.

[0014] According to another aspect of the embodiments of this application, an electronic device is provided, including: one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to implement any one of the phase sequence correction methods.

[0015] In this embodiment, current load data of the target cable under its initial phase sequence is acquired; based on the current load data, the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequences is determined; according to the cable sheath current corresponding to the target cable under the predetermined plurality of first candidate phase sequences, the target probability corresponding to each of the first candidate phase sequences is determined, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used; the phase sequence with the highest target probability among the plurality of first candidate phase sequences is determined as the target phase sequence; the initial phase sequence of the target cable is corrected to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence. This achieves the goal of determining the optimal phase sequence of the cable based on current load data and cable configuration, realizes the technical effect of reducing the cable sheath current by correcting the cable phase sequence, and thus solves the technical problem of excessive sheath current caused by unsatisfactory cable phase sequence selection in related technologies. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a flowchart of an optional phase sequence correction method provided according to an embodiment of this application;

[0018] Figure 2 This is a first circuit diagram of an optional phase sequence correction method provided according to an embodiment of this application;

[0019] Figure 3 This is a second circuit diagram of an optional phase sequence correction method provided according to an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of an optional phase sequence correction method provided according to an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of a first current load according to an optional phase sequence correction method provided in an embodiment of this application;

[0022] Figure 6 This is a schematic diagram of a second current load according to an optional phase sequence correction method provided in an embodiment of this application;

[0023] Figure 7 This is a schematic diagram of a first model of an optional phase sequence correction method provided according to an embodiment of this application;

[0024] Figure 8This is a schematic diagram of a second model of an optional phase sequence correction method provided according to an embodiment of this application;

[0025] Figure 9 This is a schematic diagram of the target probability of an optional phase sequence correction method provided according to an embodiment of this application;

[0026] Figure 10 This is a first current schematic diagram of an optional phase sequence correction method provided according to an embodiment of this application;

[0027] Figure 11 This is a second current schematic diagram of an optional phase sequence correction method provided according to an embodiment of this application;

[0028] Figure 12 This is a third current schematic diagram of an optional phase sequence correction method provided according to an embodiment of this application;

[0029] Figure 13 This is a fourth current diagram of an optional phase sequence correction method provided according to an embodiment of this application;

[0030] Figure 14 This is a schematic diagram of a third model of an optional phase sequence correction method provided according to an embodiment of this application;

[0031] Figure 15 This is a schematic diagram of a fourth model of an optional phase sequence correction method provided according to an embodiment of this application;

[0032] Figure 16 This is a schematic diagram of an optional phase sequence correction device provided according to an embodiment of this application. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0036] Digital twin technology is a simulation process that integrates multiple disciplines, multiple physical quantities, multiple scales, and multiple probabilities. It can reflect the entire life cycle of physical entities from design, manufacturing, operation to maintenance and disposal by creating digital mappings of physical entities in virtual space. It provides accurate and efficient support for product and system optimization design, predictive maintenance, fault diagnosis and health monitoring.

[0037] A 3D digital model is a virtual three-dimensional spatial representation created in a computer system. It can reproduce real-world objects or scenes in detail, including their geometry, physical properties, and functional characteristics, providing powerful visualization tools and data foundations for design, analysis, presentation, and management.

[0038] Transmission tunnels, also known as power utility tunnels or power utility corridors, are underground or above-ground passage structures used to centrally house, lay, and maintain power cables, communication cables, and other electrical equipment. Transmission tunnels are long and have large capacity, and are commonly used in urban underground power grids, large industrial areas, and cross-sea cable systems.

[0039] Angular resolution (AR) refers to the ability of a sensor or measuring device to distinguish two adjacent targets in space. It is commonly used to describe the accuracy of spatial positioning in systems such as optics, radar, sonar, and laser scanners.

[0040] Laser Point Cloud Technology (LPCT) is a method that uses a laser scanning device to emit laser pulses and receive the light signals reflected back from the surface of an object, measuring the time or intensity change of the laser from emission to return, thereby obtaining three-dimensional spatial data.

[0041] According to an embodiment of this application, a method embodiment for phase sequence correction is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0042] Figure 1 This is a flowchart of an optional phase sequence correction method provided according to an embodiment of this application, such as... Figure 1 As shown, the method includes the following steps:

[0043] Step S102: Obtain the current load data of the target cable under the initial phase sequence condition;

[0044] It is understood that obtaining the current load data of the target cable under the initial phase sequence condition—where the initial phase sequence refers to the actual phase sequence of the cable, and the current load data is the actual load data of the load current combination within a fixed time period—is used to determine the magnitude of the core current of the target cable. Optimizing the phase sequence of the target cable by obtaining the current load data under the initial phase sequence ensures a comprehensive understanding of the cable's operating characteristics under a specific phase sequence, providing a scientific basis for sheath circulating current suppression, cable heating control, and power system performance improvement.

[0045] Step S104: Based on the current load data, determine the cable sheath current corresponding to the target cable under the predetermined multiple first candidate phase sequence conditions.

[0046] It is understandable that, based on the configuration of the target cable, the possible phase sequence combinations of the target cable are enumerated and simplified to obtain multiple first candidate phase sequences, and the cable sheath current corresponding to each of these first candidate phase sequences is calculated. By enumerating and simplifying the phase sequence combinations of the target cable and calculating the cable sheath current under each phase sequence, not only can the impact of different phase sequences on cable performance be comprehensively evaluated, but also the computational efficiency can be improved, ensuring the safety and stability of cable operation.

[0047] In one optional embodiment, determining the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequence conditions based on current load data includes: determining the inductance parameters corresponding to the target cable under a plurality of first candidate phase sequence conditions based on current frequency and earth equivalent loop depth, wherein the earth equivalent loop depth represents the earth's response characteristics to the current in the target cable at the current frequency; and obtaining the cable sheath current corresponding to the plurality of first candidate phase sequences according to the current load data, the inductance parameters corresponding to the plurality of first candidate phase sequences, and the configuration of the target cable.

[0048] It is understandable that, based on cable layout cross-sectional drawings, electrical parameters, load parameters, and environmental parameters, a cross-interconnection model of the target cable is constructed. Based on this model, an equivalent circuit diagram of the target cable cross-interconnection is established. The sheath current of the target cable is then calculated using this equivalent circuit diagram. First, based on the current frequency and the equivalent ground loop depth, the inductance parameter of the target cable, i.e., the inductive reactance, is determined. The equivalent ground loop depth can be used to measure the ground's response to the current in the target cable at the current frequency. Second, based on the target cable's current load, inductance parameters, and configuration, the sheath current is obtained. Through these steps, the sheath current corresponding to multiple first candidate phase sequences of the target cable can be calculated. Constructing a cross-interconnection model of the target cable and calculating the sheath current under different phase sequences not only improves the efficiency of cable line design, operation, maintenance, and fault prevention but also ensures that the power system maintains optimal performance under various operating conditions, which is of great significance for improving the reliability of the power system.

[0049] In one optional embodiment, the inductance parameters include cable self-inductance and cable mutual inductance. Based on the current load data, the inductance parameters corresponding to the multiple first candidate phase sequences, and the configuration of the target cable, the cable sheath current corresponding to each of the multiple first candidate phase sequences is obtained. This includes: obtaining the cable sheath impedance corresponding to each of the multiple first candidate phase sequences based on the cable self-inductance; determining the induced electromotive force (EMF) of the conductor corresponding to each of the multiple first candidate phase sequences based on the cable mutual inductance and the current load data; and determining the cable sheath current corresponding to each of the multiple first candidate phase sequences according to the configuration, the cable sheath impedance, and the induced EMF of the conductor.

[0050] It is understood that inductance parameters include cable self-inductance and cable mutual inductance. Cable self-inductance refers to the impedance characteristic generated between the cable and the surrounding medium due to electromagnetic induction; cable mutual inductance refers to the impedance characteristic generated between cables due to electromagnetic induction. Based on the self-inductance of the target cable, the sheath impedance of the target cable can be determined. Based on the mutual inductance and current load data of the target cable, the induced electromotive force (EMF) of the conductor can be obtained, that is, the induced EMF generated by the conductor current in the cable sheath. According to the configuration of the target cable, based on the above-mentioned target cable sheath impedance and conductor induced EMF, the sheath current of the target cable can be obtained. Through the above steps, the cable sheath current corresponding to multiple first candidate phase sequences of the target cable can be calculated. By calculating the cable sheath current under different phase sequences in the above way, accurate cable sheath current results can be obtained, providing data support for subsequent scientific decision-making on optimizing cable operation safety, cable maintenance and life management, and phase sequence optimization.

[0051] Optionally, Figure 2 This is a first circuit diagram of an optional phase sequence correction method provided according to an embodiment of this application, as shown below. Figure 2 The image shows a pre-defined cable cross-connection grounding model, constructed based on cable layout cross-section drawings, electrical parameters, load parameters, and environmental parameters. Figure 2 In the cable cross-interconnection grounding model, the cable adopts a single-circuit, three-phase cross configuration. Each phase of the three-phase cable includes a conductor and a metal sheath. The two ends of the cable are directly grounded, and the middle is grounded through cross-interconnection.

[0052] Figure 3 This is a second circuit diagram of an optional phase sequence correction method provided according to an embodiment of this application. Figure 3 It is based on Figure 2 The equivalent circuit diagram established from the cable cross-interconnection grounding model. Figure 3 In the middle, R g R represents the earth resistance. d1 and R d2 Z1, Z2, and Z3 represent the grounding resistances at both ends of the cable, respectively, and represent the impedances of the three-phase cable. and These represent the sheath currents of the three-phase cables, Indicates the grounding current of the cable. This represents the induced electromotive force generated by the current in the conductor. The induced electromotive force i and a represent the i-th and a-th phases of the tertiary cable, respectively.

[0053] Optionally, for a single-circuit three-phase cable, the self-inductance per unit length of the sheath of the i-th phase cable is X. i The unit is Ω / m (ohms per meter):

[0054]

[0055] Where π represents the mathematical constant pi; f represents the frequency of the current in the conductor, measured in Hz (Hertz); D e r represents the depth of the geodetic isotropic loop, in meters (m); i,GMR ρ represents the geometric mean radius of the cable sheath of phase i, in meters; g The resistivity of the earth is expressed in Ω·m (ohm-meter); d b1i d represents the inner diameter of the sheath of the i-th phase cable, in mm (millimeters); b2i This indicates the outer diameter of the cable sheath for the i-th phase, in mm.

[0056] The mutual inductance between phase i and phase a is X ia(i = 1, 2, 3; a = 1, 2, 3), unit is Ω / m:

[0057]

[0058] Where, d ia This represents the center-to-center distance between the i-th phase cable and the a-th phase cable, in meters.

[0059] Optionally, for a single-circuit three-phase cable, let the three phases be numbered 1, 2, and 3 respectively. The induced electromotive force generated on its sheath includes the induced electromotive force generated by the three-phase conductor currents on the sheath and the induced electromotive force generated by the other two phase sheath currents. The induced electromotive force generated by the conductor currents on the three-phase cable sheaths... for:

[0060]

[0061] in, and The three phase conductor currents of the cable are represented by l1, l2 and l3 respectively; l1, l2 and l3 represent the cross-interconnection lengths of the three cable segments respectively; and j represents the imaginary part symbol.

[0062] Induced electromotive force generated by sheath current on three-phase sheath for:

[0063]

[0064] According to Kirchhoff's laws, we can obtain:

[0065]

[0066] Substituting formulas (5) and (6) into formula (7), the three-phase sheath current of the cable can be obtained. and and the grounding current of the cable

[0067] Alternatively, for the calculation of sheath current of multi-circuit cables, it is only necessary to extend the matrices of formulas (5), (5), and (7).

[0068] In an optional embodiment, the method further includes: determining a plurality of third candidate phase sequences; determining the effective current value of the target cable under the plurality of third candidate phase sequences respectively; and removing the phase sequences with the same effective current value from the plurality of third candidate phase sequences to obtain a plurality of first candidate phase sequences.

[0069] It is understandable that the harm caused by excessive sheath current is only related to the effective value of the current and not to the phase. Therefore, the cable phase sequence can be simplified based on the effective value of the current. First, based on the cable configuration and the number of phases, multiple third candidate phase sequences are determined using an enumeration method, i.e., all phase sequence combinations for the cable. The effective values ​​of the current corresponding to each of the multiple third candidate phase sequences of the target cable are determined, and in the phase sequence group with the same effective value of current, one is retained, and the rest are removed. All the retained phase sequences are the multiple first candidate phase sequences of the aforementioned target cable. Simplifying the cable phase sequence based on the effective value of current not only improves computational efficiency and decision quality and reduces data redundancy, but also promotes intelligent cable design, operation and maintenance, and fault prevention, which is of great significance for ensuring the safe and stable operation and optimized design of power systems.

[0070] Step S106: Determine the target probability corresponding to each of the multiple first candidate phase sequences according to the cable sheath current corresponding to the target cable under the multiple predetermined first candidate phase sequences. The target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used.

[0071] It is understandable that after obtaining the sheath current of the target cable, the target probability, i.e., the probability that the grounding current will not exceed the limit, is obtained based on the maximum value of the sheath current of different phases and the current load data. The aforementioned target probability represents the probability that the grounding current of the target cable will not exceed a predetermined threshold under the given current load data and with this phase sequence. Through the above steps, the target probabilities corresponding to multiple first candidate phase sequences of the target cable can be calculated. By determining the probability that the cable sheath grounding current will not exceed the limit under different phase sequences, not only can the scientific and intelligent nature of operation and maintenance decisions be promoted, but the safety and stability of power system operation can also be improved.

[0072] In one optional embodiment, the cable sheath current includes the single-phase sheath current corresponding to each of the three phases of the target cable. The target probability corresponding to each of the multiple first candidate phase sequences is determined according to the cable sheath current corresponding to each of the predetermined multiple first candidate phase sequences. This includes: for one of the multiple first candidate phase sequences, determining the maximum sheath current among the single-phase sheath currents corresponding to each of the three phases under that candidate phase sequence; determining the target probability corresponding to a candidate phase sequence based on the maximum sheath current; and determining the target probability corresponding to each of the multiple first candidate phase sequences by using the method of determining the target probability corresponding to a candidate phase sequence.

[0073] It can be understood that the target cable is a three-phase cross-connected cable, meaning that the target cable includes three phases, each with a sheath current. Under a given phase sequence (which belongs to multiple first candidate phase sequences of the target cable), the maximum sheath current is obtained based on the calculated results of the three-phase sheath current of the target cable. Based on the maximum sheath current, the target probability for this given phase sequence is obtained. Through this method, the target probabilities corresponding to multiple first candidate phase sequences of all target cables can be obtained. By quantifying the target probabilities, the risk level of excessive sheath current under different phase sequences can be accurately assessed, providing maintenance personnel with a scientific basis for phase sequence optimization decisions and reducing safety hazards in cable operation.

[0074] Optionally, the target probability of the target cable, i.e., the probability P that the cable sheath grounding current does not exceed the standard. c for:

[0075]

[0076] Where n represents the nth current load data, N represents the number of current load data; c represents the cth phase sequence among the multiple first candidate phase sequences of the target cable; U c，n U' represents the maximum sheath current of the three-phase cable sheath. c，n This indicates whether the c-th phase sequence among multiple first candidate phase sequences of the target cable under the nth current load data condition exceeds a predetermined threshold. If U' c，n =1 indicates that the phase sequence does not exceed the predetermined threshold. If U' c，n =0, indicating that the phase sequence exceeds the predetermined threshold. From formula (8), it can be seen that the probability P of the cable sheath grounding current not exceeding the standard is... c The larger the value of P, the lower the probability of the target cable grounding current exceeding the limit for the c-th phase sequence under the given N current load data conditions, indicating a better phase sequence. Conversely, a smaller value of P indicates a lower probability of exceeding the limit. c The smaller the value, the greater the likelihood that the grounding current of the target cable in the c-th phase sequence will exceed the limit under the given N current load data conditions.

[0077] Optionally, the absolute value of the grounding current of a single-circuit cable line should be less than 100A (amperes), so the sheath current value of each phase cable should be less than 33.3A. That is, the predetermined threshold of the grounding current of the target cable is 100A, and the predetermined threshold of the sheath current of each phase cable is 33.3A.

[0078] Step S108: Determine the phase sequence with the highest target probability among multiple first candidate phase sequences, and use it as the target phase sequence;

[0079] It is understandable that, based on the target probabilities corresponding to multiple first candidate phase sequences of the target cable, the phase sequence with the highest target probability is determined and used as the target phase sequence. The maximum risk of the cable can be determined through the target probability, and corresponding decision optimization, risk avoidance, and fault prevention can be performed to improve the safety and reliability of the power system.

[0080] In an optional embodiment, the method further includes: when there are multiple phase sequences with the highest target probability among multiple first candidate phase sequences, the multiple phase sequences with the highest target probability are designated as multiple second candidate phase sequences; based on the cable sheath current and AC resistance corresponding to the target cable, the heating power corresponding to each of the multiple second candidate phase sequences is determined; and the phase sequence with the lowest heating power among the multiple second candidate phase sequences is determined as the target phase sequence.

[0081] It is understandable that the target probability corresponding to multiple first candidate phase sequences of the target cable can be obtained by using the maximum sheath current of the cable. The phase sequence with the highest target probability is the optimal phase sequence of the target cable. When the optimal phase sequence is unique, it is the target phase sequence of the target cable. When the optimal phase sequence is not unique, the multiple optimal phase sequences (i.e., the phase sequences with the highest target probabilities) are used as multiple second candidate phase sequences of the target cable. Based on the sheath current and AC resistance of the target cable, the heat generation power corresponding to each of the multiple second candidate phase sequences is determined, and the phase sequence with the lowest heat generation power is selected as the target phase sequence of the target cable. By further screening the multiple phase sequences with the highest target probabilities to select the phase sequence with the lowest heat generation power as the target phase sequence, decision support can be provided for cable phase sequence optimization and risk assessment, thereby improving the safety, stability, and operating efficiency of the power system.

[0082] Optionally, when there are multiple first candidate phase sequences of the target cable with the highest target probability, the heat generation power of the multiple phase sequences with the highest target probability is calculated. Determine the target phase sequence of the target cable. Heat output power. The formula is:

[0083]

[0084] Where K represents the number of cable connections, I k R represents the maximum sheath current of the three-phase sheath current of the k-th cable. k This represents the AC resistance of the k-th cable.

[0085] Step S110: Correct the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence.

[0086] It is understandable that determining the target phase sequence of a target cable based on the target probability and heat generation power can effectively reduce the sheath current of the target cable. Therefore, the initial phase sequence of the target cable is corrected to this target phase sequence to reduce the sheath grounding current of the target cable. Determining the optimal phase sequence based on the target probability and heat generation power and adjusting the initial phase sequence of the cable can not only significantly reduce the sheath grounding current and cable heating, improving the safety and stability of power system operation, but also promote intelligent operation and maintenance of the power system, providing support for the optimized design of cables and the allocation of power system resources.

[0087] In an optional embodiment, the method further includes: acquiring three-dimensional spatial data and texture data of the target cable; rendering based on the three-dimensional spatial data and texture data to obtain a simulation structure of the target cable; and visually annotating the simulation structure according to the configuration of the target cable and using the target phase sequence.

[0088] The process involves acquiring the target cable's 3D spatial and texture data, and then preprocessing this data. Based on the preprocessed data, a simulation structure of the target cable is constructed using 3D modeling software. This simulation structure is then linked to the target phase sequence, allowing for visual annotation of the cable's configuration and phase sequence. Constructing this simulation structure presents complex cable configurations and phase sequence optimization results in an intuitive 3D image, helping maintenance personnel and decision-makers to quickly and accurately understand the cable's operating status and optimized phase sequence, thus improving the intuitiveness and efficiency of decision-making.

[0089] Through step S102, the current load data of the target cable under the initial phase sequence is obtained; in step S104, based on the current load data, the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequences is determined; in step S106, according to the cable sheath current corresponding to the target cable under the predetermined plurality of first candidate phase sequences, the target probability corresponding to each of the first candidate phase sequences is determined, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used; in step S108, the phase sequence with the highest target probability among the plurality of first candidate phase sequences is determined as the target phase sequence; in step S110, the initial phase sequence of the target cable is corrected to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence. This achieves the goal of determining the optimal phase sequence of the cable based on current load data and cable configuration, realizing the technical effect of reducing the cable sheath current by correcting the cable phase sequence, thereby solving the technical problem of excessive sheath current caused by unsatisfactory cable phase sequence selection in related technologies.

[0090] Based on the above embodiments and optional embodiments, this application proposes an optional implementation method for correcting the initial phase sequence of a cable and using a cable simulation structure to visually annotate the corrected cable phase sequence. Figure 4 This is a schematic diagram of an optional phase sequence correction method provided according to an embodiment of this application, such as... Figure 4 As shown, cable phase sequence correction is divided into three parts: corridor 3D modeling, namely, constructing the simulation structure of the target cable, establishing the phase sequence database, and 3D model display and interaction. The simulation structure of the target cable includes the 3D structure of the cable and the 3D structure of the transmission corridor in which the cable is located. For corridor 3D modeling, point cloud data of the transmission corridor and the target cable can be obtained through 3D laser scanning. The point cloud data is preprocessed to obtain spatial data of the transmission corridor and the target cable; texture data of the transmission corridor and the target cable is obtained through texture mapping acquisition and texture mapping creation. Based on the above spatial and texture data, 3D modeling of the transmission corridor and the target cable is performed to obtain the simulation structure of the target cable. For phase sequence database establishment, current load data over a certain period of time is obtained through current load curves; a cross-interconnection grounding model of the target cable is constructed based on electrical and environmental parameters; and the phase sequence combinations of the target cable are enumerated and simplified according to the target cable configuration. Based on the above current load data, the target cable cross-interconnection grounding model, and the simplified phase sequence of the target cable, the sheath current of the target cable under each simplified phase sequence is obtained. Based on the sheath current of the target cable under each simplified phase sequence, the probability of the grounding current not exceeding the standard (i.e., the target probability) and the expected sheath heating power (i.e., the heating power) of the target cable under each simplified phase sequence are obtained. Based on the target probability and heating power of the target cable, the target phase sequence of the target cable under the current load data is obtained, and a phase sequence database is constructed. For 3D model display and interaction, the phase sequence database is associated with the corridor 3D model to establish a corridor roaming program and a cable phase sequence interactive interface. By clicking on the corresponding cable line model, the corresponding cable line attribute parameters, the grounding current derivation process, and the optimal phase sequence recommendation visualization results can be obtained.

[0091] For 3D modeling of the transmission corridor, the simulation structure of the target cable is constructed. The first step is the acquisition of 3D data of the outer contour of the transmission corridor. This can be achieved by setting up a 3D laser scanner on the ground to obtain the 3D information of the outer contour. For the initial scan, the 3D laser scanner needs to be stationary for a period of time to improve the accuracy of the internal tilt sensor. Parameters such as the scanning angular resolution, field of view, and point cloud channels are set according to actual needs, and a suitable location for the 3D laser scanner is selected based on the visibility within the corridor. The point cloud data acquired by the 3D laser scanner is preprocessed, using methods such as stitching and noise reduction. First, coarse stitching selects corresponding points, aligning overlapping parts between adjacent stations. Then, fine stitching is performed on the point cloud data, i.e., overall adjustment is performed on the coarsely stitched point cloud data based on target and control point data. Finally, statistical filtering methods are used to remove noise from the point cloud, and point cloud data irrelevant to the acquisition target are manually removed. Based on the above process, the 3D spatial data of the outer contour of the transmission corridor can be obtained. The second step is the acquisition of data inside the transmission corridor, including spatial data acquisition and physical data acquisition. Three-dimensional spatial data within the power transmission corridor can be collected using laser point cloud technology and robotic patrol methods. By integrating existing drawings, equipment information, and other data, comprehensive texture data within the corridor can be obtained. Based on the three-dimensional spatial data of the corridor's outer contour, the three-dimensional spatial data within the corridor, and the texture data within the corridor, a simulation structure of the target cable is constructed using 3D modeling software. Texture mapping and lighting rendering methods are then used to refine the model.

[0092] A phase sequence database for the target cable is established. First, current load data over a certain period of time is obtained through the current load curve. For cable lines that are actually in operation or for which load prediction has already been performed, actual load data can be obtained for the load current combination within a fixed time period. Figure 5 This is a schematic diagram of a first current load according to an optional phase sequence correction method provided in an embodiment of this application, taking a double-circuit parallel cable line as an example. Figure 5 This is the first time that hourly current load data has been collected for the cable line over a year. The horizontal axis of the curve represents time, and the vertical axis represents current load. A total of 8760 data sets were collected, forming the following structure: Figure 5 The current load curve shown is shown. Figure 6 This is a second current load schematic diagram of an optional phase sequence correction method provided in an embodiment of this application, taking a double-circuit parallel cable line as an example. Figure 6 The second cable line collected one set of current load data every hour throughout the year. The horizontal axis of the curve represents time, and the vertical axis represents current load. A total of 8760 sets of data were collected, forming the following structure: Figure 6 The current load curve shown is shown.

[0093] Secondly, a cross-interconnection grounding model of the target cables is constructed based on electrical and environmental parameters, and the phase sequence combinations of the target cables are enumerated and simplified according to the configuration of the target cables. By obtaining information such as the target cable laying cross-section drawings, electrical parameters, load parameters, and environmental parameters, a cross-interconnection grounding model of the target cables is established, and an equivalent circuit diagram of the cross-interconnection of the target cables is established based on this cross-interconnection grounding model. Figure 2 This is a predetermined cable cross-connection grounding model, and 3 is based on Figure 2 The equivalent circuit diagram is established based on the cable cross-interconnection grounding model. Since the harm caused by excessive sheath current is only related to the effective value of the current and not to the phase, the phase sequence of the target cable can be enumerated and simplified according to the target cable configuration. For phase sequence enumeration, taking a multi-circuit parallel cable laying configuration as an example, if the number of circuits is k, then there are 3k cables, and the possible phase sequence arrangements are (3!). k Type. For phase sequence simplification, since the harm caused by excessive sheath current is only related to the effective value of the current and not to the phase, if the three-phase load current of each circuit is balanced, (3!) can be used. k The species sequence arrangement is simplified to 2×6 n-1 For example, in a double-circuit parallel cable line, A, B, and C represent the three-phase sequence numbers of the cable. The cable sheath current results obtained with the phase sequence arrangement BCA / BCA and CAB / CAB are the same as the effective values ​​of the cable sheath current obtained with the phase sequence ABC / ABC.

[0094] Then, based on the aforementioned current load data, the target cable cross-interconnection grounding model, and the simplified phase sequence of the target cable, the sheath current of the target cable under each simplified phase sequence is obtained. Based on the current frequency and the equivalent ground loop depth, the inductance parameters of the target cable, i.e., the inductive reactance of the target cable, are determined. The equivalent ground loop depth can be used to measure the ground's response characteristics to the current in the target cable at the current frequency. Next, based on the current load, inductance parameters, and configuration of the target cable, the sheath current of the target cable is obtained. Through the above steps, the cable sheath current corresponding to each of the multiple first candidate phase sequences (i.e., the simplified target cable phase sequence) of the target cable can be calculated.

[0095] The aforementioned inductance parameters include cable self-inductance and cable mutual inductance. Cable self-inductance refers to the impedance characteristic generated between the cable and the surrounding medium due to electromagnetic induction; cable mutual inductance refers to the impedance characteristic generated between cables due to electromagnetic induction. Based on the self-inductance of the target cable, the sheath impedance of the target cable can be determined. Based on the mutual inductance and current load data of the target cable, the induced electromotive force (EMF) of the conductor can be obtained, that is, the induced EMF generated by the conductor current in the cable sheath. According to the configuration of the target cable, based on the aforementioned target cable sheath impedance and conductor induced EMF, the sheath current of the target cable can be obtained. Through the above steps, the cable sheath current corresponding to multiple first candidate phase sequences of the target cable can be calculated. By calculating the cable sheath current under different phase sequences in the above manner, accurate cable sheath current results can be obtained, providing data support for subsequent scientific decision-making on optimizing cable operation safety, cable maintenance and life management, and phase sequence optimization.

[0096] Optionally, for a single-circuit three-phase cable, the self-inductance per unit length of the sheath of the i-th phase cable is X. i The unit is Ω / m (ohms per meter):

[0097]

[0098] Where π represents the mathematical constant pi; f represents the frequency of the current in the conductor, measured in Hz (Hertz); D e r represents the depth of the geodetic isotropic loop, in meters (m); i,GMR ρ represents the geometric mean radius of the cable sheath of phase i, in meters; g The resistivity of the earth is expressed in Ω·m (ohm-meter); d b1i d represents the inner diameter of the sheath of the i-th phase cable, in mm (millimeters); b2i This indicates the outer diameter of the cable sheath for the i-th phase, in mm.

[0099] The mutual inductance between phase i and phase a is X ia (i = 1, 2, 3; a = 1, 2, 3), unit is Ω / m:

[0100]

[0101] Where, d ia This represents the center-to-center distance between the i-th phase cable and the a-th phase cable, in meters.

[0102] Optionally, due to electromagnetic induction between metallic conductors, when current flows through the cable core, an induced current is generated in the metallic sheath. The induced electromotive force (EMF) in the sheath is generated jointly by the core current and the sheath current. For a single-circuit three-phase cable, let the three phases A, B, and C be numbered 1, 2, and 3 respectively. The induced EMF generated in its sheath includes the induced EMF generated by the three-phase core current in the sheath and the induced EMF generated by the other two phase sheath currents.

[0103] The induced electromotive force generated by the conductor current in the three-phase sheath of the cable for:

[0104]

[0105] in, and The three phase conductor currents of the cable are represented by l1, l2 and l3 respectively; l1, l2 and l3 represent the cross-interconnection lengths of the three cable segments respectively; and j represents the imaginary part symbol.

[0106] Induced electromotive force generated by sheath current on three-phase sheath for:

[0107]

[0108] According to Kirchhoff's laws, we can obtain:

[0109]

[0110] Substituting formulas (5) and (6) into formula (7), the three-phase sheath current of the cable can be obtained. and and the grounding current of the cable

[0111] Alternatively, for the calculation of sheath current of multi-circuit cables, it is only necessary to extend the matrices of formulas (5), (5), and (7).

[0112] Finally, based on the sheath current of the target cable under each simplified phase sequence, the probability of the grounding current not exceeding the standard (i.e., the target probability) and the expected sheath heating power (i.e., the heating power) of the target cable under each simplified phase sequence are obtained. Based on the target probability and heating power of the target cable, the target phase sequence of the target cable under the current load data is obtained, and a phase sequence database is constructed. After obtaining the cable sheath current of the target cable, based on the maximum value of the sheath current of different phases in the cable sheath current and the current load data, the target probability, i.e., the probability of the grounding current not exceeding the standard, is obtained. The above target probability represents the probability that the grounding current of the target cable will not exceed a predetermined threshold under the above current load data when using this phase sequence. Through the above steps, the target probabilities corresponding to multiple first candidate phase sequences of the target cable can be calculated. The target probabilities corresponding to multiple first candidate phase sequences of the target cable can be obtained through the maximum sheath current of the cable. The phase sequence with the highest target probability is the optimal phase sequence of the target cable. When the optimal phase sequence is unique, the optimal phase sequence is the target phase sequence of the target cable. When the optimal phase sequence is not unique, the aforementioned multiple optimal phase sequences (i.e., the phase sequence with the highest target probability) are used as multiple second candidate phase sequences for the target cable. Based on the cable sheath current and AC resistance corresponding to the target cable, the heat generation power corresponding to each of the multiple second candidate phase sequences is determined, and the phase sequence with the lowest heat generation power is selected as the target phase sequence for the target cable. By further screening the multiple phase sequences with the highest target probability to select the phase sequence with the lowest heat generation power as the target phase sequence, decision support can be provided for cable phase sequence optimization and risk assessment, thereby improving the safety, stability, and operational efficiency of the power system.

[0113] Optionally, regarding the probability of the grounding current not exceeding the standard (i.e., the target probability), according to relevant regulations, the absolute value of the grounding current in a single-core cable line should be less than 100A, so the sheath circulating current value of each cable should be less than 33.3A. The probability P of the grounding current not exceeding the standard is calculated for all simplified phase sequence arrangements. c P c The formula is:

[0114]

[0115] Where n represents the nth current load data, N represents the number of current load data; c represents the cth phase sequence among the multiple first candidate phase sequences of the target cable; U c，n U' represents the maximum sheath current of the three-phase cable sheath. c，n This indicates whether the c-th phase sequence among multiple first candidate phase sequences of the target cable under the nth current load data condition exceeds a predetermined threshold. If U' c，n =1 indicates that the phase sequence does not exceed the predetermined threshold. If U' c，n =0, indicating that the phase sequence exceeds the predetermined threshold. From formula (8), it can be seen that the probability P of the cable sheath grounding current not exceeding the standard is... cThe larger the value of P, the lower the probability of the target cable grounding current exceeding the limit for the c-th phase sequence under the given N current load data conditions, indicating a better phase sequence. Conversely, a smaller value of P indicates a lower probability of exceeding the limit. c The smaller the value, the greater the likelihood that the grounding current of the target cable in the c-th phase sequence will exceed the limit under the given N current load data conditions.

[0116] Optionally, for the expected heating power of the sheath (i.e., the heating power), if there are multiple phase sequence arrangements that ensure the sheath grounding current does not exceed the limit, the probability P c To minimize the heat generation of the cable sheath, the expected heat generation power is calculated, given that the values ​​are both maximum and equal. Based on the expected value of heat generation power The minimum value determines the target phase sequence. Heating power. The formula is:

[0117]

[0118] Wherein, I represents the number of turns in the K-cable configuration. k R represents the maximum sheath current of the three-phase sheath current of the k-th cable. k This represents the AC resistance of the k-th cable.

[0119] For 3D model display and interaction, the phase sequence database is linked with the corridor 3D model to establish a corridor roaming program and a cable phase sequence interaction interface. By clicking on the corresponding cable line model, the corresponding cable line attribute parameters, grounding current derivation process, and optimal phase sequence recommendation visualization results can be obtained. The 3D spatial data and texture data of the target cable are acquired and preprocessed. Based on the preprocessed 3D spatial data and texture data, a simulation structure of the target cable is constructed using 3D modeling software. By constructing the simulation structure of the target cable, the target phase sequence of the target cable is linked to the simulation structure, and the configuration method and target phase sequence of the target cable are visually labeled in the simulation structure. Constructing the simulation structure of the target cable can present complex cable configuration methods and phase sequence optimization results in an intuitive 3D image form, helping maintenance personnel or decision-makers to understand the cable's operating status and optimized phase sequence more quickly and accurately, improving the intuitiveness and efficiency of decision-making.

[0120] The phase sequence correction method can be applied to a software application, taking a 220kV double-circuit cable line in a certain area as an example. A pre-defined 3D laser scanner is used to acquire 3D point cloud data within the transmission corridor via ground-based stations. This data, combined with existing drawings and equipment information of each device within the corridor, is used to establish a 3D structural model of the transmission corridor and a 3D structural model of the cable. Figure 7 This is a schematic diagram of a first model of an optional phase sequence correction method provided according to an embodiment of this application. Figure 7 The three-dimensional structure of the aforementioned power transmission corridor is shown. Figure 7 The document includes both the external outline and internal structure diagrams of the power transmission corridor. Figure 7 The information can be seen from the dimensions, structure, and internal equipment of the power transmission corridor. Figure 8 This is a schematic diagram of a second model of an optional phase sequence correction method provided according to an embodiment of this application. Figure 8 The three-dimensional structure of the aforementioned cable is shown, as follows: Figure 8 As shown, the target cable is configured in a double-circuit parallel configuration. Figure 8 The left side shows a cross-sectional view of the double-circuit parallel cable. The first circuit cable, namely the A-line cable, has three phases arranged in a close triangular pattern. The second circuit cable, namely the C-line cable, also has a triangular pattern. The distance between the bottom two phases is 350 mm, and the vertical distance between the line connecting the top phase and the bottom two phases is 450 mm.

[0121] Data on the actual load current of the line was collected at one-hour intervals over a given year, and the results were as follows: Figure 5 and Figure 6 The current load curve is shown. The target cable line has 6 cables, and there are 36 possible phase sequence arrangements as shown in Table 1. Assuming the three-phase load current is balanced for each circuit, and A, B, and C represent the three-phase sequence numbers of the cable, the sheath circulating current obtained under the phase sequence arrangements BCA / BCA and CAB / CAB is the same as the effective value obtained under the phase sequence ABC / ABC. The phase sequences in the second and third columns of Table 1 are respectively 120° ahead or behind the phase sequence in the first column. The 36 phase sequence arrangements are converted into the 12 phase sequences shown in the first column of Table 1, and the probability of the sheath current not exceeding the limit is calculated based on the data recorded in the load curves for these 12 phase sequences.

[0122] Table 1 Phase sequence combination methods

[0123]

[0124] Figure 9 This is a schematic diagram of the target probability of an optional phase sequence correction method provided according to an embodiment of this application. Figure 9 The results show the probability of the cable sheath current not exceeding the limit for the above 12 phase sequences. The horizontal axis represents the phase sequence combination, and the vertical axis represents the probability of the cable sheath current not exceeding the limit. Figure 9 As shown, when phase sequence 6 or 8 is used, the probability that the sheath current of the two cables will not exceed 33.3A is 100%.

[0125] Figure 10 This is a first current schematic diagram of an optional phase sequence correction method provided according to an embodiment of this application. Figure 10This indicates how the sheath current of the first cable changes with the load current when the cable uses phase sequence number 6. Figure 10 As shown, the two dashed lines represent the cable sheath current of 33.3A. The cable sheath current in the O region above the two dashed lines is greater than 33.3A, the cable sheath current in the D region between the two dashed lines is less than 33.3A, and the cable sheath current in the Q region is greater than 33.3A. Figure 11 This is a second current schematic diagram of an optional phase sequence correction method provided according to an embodiment of this application. Figure 11 This indicates how the sheath current of the second cable changes with the load current when the cable uses phase sequence number 6. Figure 11 As shown, the two dashed lines represent the cable sheath current of 33.3A. The cable sheath current in the O region above the two dashed lines is greater than 33.3A, the cable sheath current in the D region between the two dashed lines is less than 33.3A, and the cable sheath current in the Q region is greater than 33.3A. Figure 12 This is a third current schematic diagram of an optional phase sequence correction method provided according to an embodiment of this application. Figure 12 This indicates how the sheath current of the first cable changes with the load current when the cable uses phase sequence 8. Figure 12 As shown, the two dashed lines represent the cable sheath current of 33.3A. The cable sheath current in the O region above the two dashed lines is greater than 33.3A, the cable sheath current in the D region between the two dashed lines is less than 33.3A, and the cable sheath current in the Q region is greater than 33.3A. Figure 13 This is a fourth current diagram illustrating an optional phase sequence correction method provided in an embodiment of this application. Figure 13 This indicates how the sheath current of the second cable changes with the load current when the cable uses phase sequence number 8. Figure 13 As shown, the two dashed lines represent the cable sheath current of 33.3A. The cable sheath current in the O region above the two dashed lines is greater than 33.3A, the cable sheath current in the D region between the two dashed lines is less than 33.3A, and the cable sheath current in the Q region is greater than 33.3A.

[0126] Since the optimal phase sequence is not unique, it is necessary to further compare the expected values ​​of cable sheath current heating power under phase sequence arrangements 6 and 8. The results are shown in Table 2. When using phase sequence 8, the sum of the expected values ​​of sheath current heating power of the two cables is the smallest. Figure 5 Under the current load curve distribution conditions shown, the target phase sequence of this target cable is phase sequence number 8. Figure 14 This is a schematic diagram of a third model of an optional phase sequence correction method provided according to an embodiment of this application. Figure 14 This displays a visualization of the first circuit of the target cable when the phases are arranged in phase sequence number 8. Figure 14 Information such as the phase sequence, arrangement, and cable properties of the first cable can be obtained from it. Figure 15 This is a schematic diagram of a fourth model of an optional phase sequence correction method provided according to an embodiment of this application. Figure 15 The visualization shows the second cable when the target cable is arranged in phase sequence number 8. Figure 15 Information such as the phase sequence, arrangement, and cable properties of the second-phase cable can be obtained from it.

[0127] Table 2 Expected values ​​of sheath current heating power under different phase sequence arrangements

[0128]

[0129] The above optional implementation methods achieve at least the following effects: by simplifying the number of cable phase sequence combinations through cable configuration methods, and selecting the target phase sequence of the cable based on two judgment conditions, namely target probability and heat generation power, not only is the computational efficiency improved, but also decision support is provided for cable phase sequence optimization; by constructing a cable simulation structure and establishing a connection between it and the cable phase sequence database, the cable configuration method and target phase sequence can be visualized and labeled in the simulation structure of the target cable, so that the complex cable configuration method and phase sequence optimization results are presented in an intuitive three-dimensional image form.

[0130] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0131] This embodiment also provides a phase sequence correction device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the terms "module" and "device" can refer to a combination of software and / or hardware that performs a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware implementations, or a combination of software and hardware, are also possible and contemplated.

[0132] According to an embodiment of this application, an apparatus embodiment for implementing a phase sequence correction method is also provided. Figure 16 This is a schematic diagram of a phase sequence correction device according to an embodiment of this application, as shown below. Figure 16 As shown, the phase sequence correction device includes a current load data acquisition module 1602, a cable sheath current determination module 1604, a target probability determination module 1606, a target phase sequence determination module 1608, and an initial phase sequence correction module 1610. The device will be described below.

[0133] The current load data acquisition module 1602 is used to acquire the current load data of the target cable under the initial phase sequence condition;

[0134] The cable sheath current determination module 1604 is connected to the current load data acquisition module 1602 and is used to determine the cable sheath current corresponding to the target cable under a predetermined number of first candidate phase sequence conditions based on the current load data.

[0135] The target probability determination module 1606 is connected to the cable sheath current determination module 1604 and is used to determine the target probability corresponding to the multiple first candidate phase sequences according to the cable sheath current corresponding to the target cable under the multiple predetermined first candidate phase sequences. The target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used.

[0136] The target phase sequence determination module 1608 is connected to the target probability determination module 1606 and is used to determine the phase sequence with the highest target probability among multiple first candidate phase sequences as the target phase sequence.

[0137] The initial phase sequence correction module 1610 is connected to the target phase sequence determination module 1608 and is used to correct the initial phase sequence of the target cable to the target phase sequence. The sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence.

[0138] In a phase sequence correction device provided in this application embodiment, a current load data acquisition module 1602 is set up to acquire current load data of the target cable under the initial phase sequence condition; a cable sheath current determination module 1604, connected to the current load data acquisition module 1602, is used to determine the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequence conditions based on the current load data; a target probability determination module 1606, connected to the cable sheath current determination module 1604, is used to determine a plurality of... The target probabilities corresponding to the first candidate phase sequences are defined as follows: the target probability represents the probability that the grounding current of the target cable will be less than a predetermined threshold when the corresponding first candidate phase sequence is used; the target phase sequence determination module 1608, connected to the target probability determination module 1606, is used to determine the phase sequence with the highest target probability among multiple first candidate phase sequences, and use it as the target phase sequence; the initial phase sequence correction module 1610, connected to the target phase sequence determination module 1608, is used to correct the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence. This achieves the goal of determining the optimal phase sequence of the cable based on current load data and cable configuration, realizes the technical effect of reducing the cable sheath current by correcting the cable phase sequence, and thus solves the technical problem of excessive sheath current caused by unsatisfactory cable phase sequence selection in related technologies.

[0139] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0140] It should be noted that the aforementioned current load data acquisition module 1602, cable sheath current determination module 1604, target probability determination module 1606, target phase sequence determination module 1608, and initial phase sequence correction module 1610 correspond to steps S102 to S110 in the embodiments. The instances and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the content disclosed in the above embodiments. It should be noted that the above modules, as part of the device, can run on a computer terminal.

[0141] It should be noted that the optional or preferred implementation methods of this embodiment can be found in the relevant descriptions in the embodiments, and will not be repeated here.

[0142] The aforementioned phase sequence correction device may also include a processor and a memory. The current load data acquisition module 1602, the cable sheath current determination module 1604, the target probability determination module 1606, the target phase sequence determination module 1608, and the initial phase sequence correction module 1610 are all stored as program units in the memory. The processor executes the aforementioned program units stored in the memory to realize the corresponding functions.

[0143] The processor contains a core that retrieves the corresponding program unit from memory. One or more cores may be configured. Memory may include non-persistent memory in computer-readable media, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory includes at least one memory chip.

[0144] This application provides a non-volatile storage medium storing a program that, when executed by a processor, implements a phase sequence correction method.

[0145] This application provides an electronic device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: acquiring current load data of a target cable under its initial phase sequence; determining the cable sheath current corresponding to a plurality of predetermined first candidate phase sequences based on the current load data; determining the target probability corresponding to each of the plurality of first candidate phase sequences according to the cable sheath currents corresponding to the target cable under the plurality of predetermined first candidate phase sequences, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when using the corresponding first candidate phase sequence; determining the phase sequence with the highest target probability among the plurality of first candidate phase sequences as the target phase sequence; and correcting the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence. The device described herein may be a server, PC, etc.

[0146] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having the following method steps: acquiring current load data of a target cable under an initial phase sequence; determining the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequence conditions based on the current load data; determining the target probability corresponding to each of the plurality of first candidate phase sequences according to the cable sheath current corresponding to the target cable under the predetermined plurality of first candidate phase sequence conditions, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used; determining the phase sequence with the highest target probability among the plurality of first candidate phase sequences as the target phase sequence; and correcting the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence.

[0147] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0148] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0149] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0150] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0151] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0152] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0153] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0154] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0155] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0156] The above are merely embodiments of this application and are not intended to limit the scope of 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 the claims of this application.

Claims

1. A phase sequence correction method, characterized in that, include: Acquire the current load data of the target cable under the initial phase sequence condition; Based on the current load data, determine the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequence conditions; Based on the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequences, the target probability corresponding to each of the plurality of first candidate phase sequences is determined, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used; The phase sequence with the highest target probability among the plurality of first candidate phase sequences is determined as the target phase sequence; The initial phase sequence of the target cable is corrected to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence.

2. The method according to claim 1, characterized in that, The step of determining the cable sheath current corresponding to the target cable under a predetermined plurality of first candidate phase sequence conditions based on the current load data includes: Based on the current frequency and the equivalent ground loop depth, the inductance parameters of the target cable are determined for each of the multiple first candidate phase sequence conditions, wherein the equivalent ground loop depth represents the ground response characteristics to the current in the target cable at the current frequency. Based on the current load data, the inductance parameters corresponding to the plurality of first candidate phase sequences, and the configuration of the target cable, the cable sheath current corresponding to the plurality of first candidate phase sequences is obtained.

3. The method according to claim 2, characterized in that, The inductance parameters include cable self-inductance and cable mutual inductance. The process of obtaining the cable sheath current corresponding to each of the multiple first candidate phase sequences based on the current load data, the inductance parameters corresponding to the multiple first candidate phase sequences, and the configuration of the target cable includes: Based on the cable self-inductance corresponding to the plurality of first candidate phase sequences, the cable sheath impedance corresponding to the plurality of first candidate phase sequences is obtained. Based on the cable mutual inductance corresponding to the first candidate phase sequence and the current load data, the core induced electromotive force corresponding to the plurality of first candidate phase sequences is determined. Based on the configuration, and the cable sheath impedance and the induced electromotive force of the conductor corresponding to the plurality of first candidate phase sequences, the cable sheath current corresponding to the plurality of first candidate phase sequences is determined.

4. The method according to claim 1, characterized in that, The cable sheath current includes the single-phase sheath current corresponding to each of the three phases of the target cable. Determining the target probability corresponding to each of the multiple first candidate phase sequences based on the cable sheath current corresponding to the target cable under predetermined multiple first candidate phase sequence conditions includes: For one of the plurality of first candidate phase sequences, under the condition of the one candidate phase sequence, determine the maximum sheath current among the single-phase sheath currents corresponding to the three phases respectively; Based on the maximum sheath current, determine the target probability corresponding to the candidate phase sequence; The target probabilities corresponding to the plurality of first candidate phase sequences are determined by determining the target probability corresponding to the candidate phase sequence.

5. The method according to claim 1, characterized in that, The method further includes: If there are multiple phase sequences with the highest target probability among the multiple first candidate phase sequences, then the multiple phase sequences with the highest target probability are designated as multiple second candidate phase sequences. Based on the cable sheath current and AC resistance of the target cable, the heating power corresponding to the plurality of second candidate phase sequences is determined. The phase sequence with the lowest heating power among the plurality of second candidate phase sequences is determined as the target phase sequence.

6. The method according to claim 1, characterized in that, The method further includes: Multiple third candidate phase sequences were determined; Determine the effective current value of the target cable under each of the multiple third candidate phase sequence conditions; The phase sequences with the same effective current value among the plurality of third candidate phase sequences are removed to obtain the plurality of first candidate phase sequences.

7. The method according to any one of claims 1 to 6, characterized in that, The method further includes: Acquire the three-dimensional spatial data and texture data of the target cable; The simulated structure of the target cable is obtained by rendering based on the three-dimensional spatial data and the texture data. According to the configuration of the target cable, the simulation structure is visualized and labeled using the target phase sequence.

8. A phase sequence correction device, characterized in that, include: The current load data acquisition module is used to acquire the current load data of the target cable under the initial phase sequence condition; The cable sheath current determination module is used to determine the cable sheath current of the target cable under a predetermined plurality of first candidate phase sequence conditions based on the current load data. The target probability determination module is used to determine the target probability corresponding to each of the multiple first candidate phase sequences according to the cable sheath current corresponding to the target cable under the predetermined multiple first candidate phase sequence conditions, wherein the target probability represents the probability that the grounding current of the target cable is less than a predetermined threshold when the corresponding first candidate phase sequence is used; The target phase sequence determination module is used to determine the phase sequence with the highest target probability among the plurality of first candidate phase sequences, and to take it as the target phase sequence. An initial phase sequence correction module is used to correct the initial phase sequence of the target cable to the target phase sequence, wherein the sheath grounding current of the target cable using the target phase sequence is less than the sheath grounding current of the target cable using the initial phase sequence.

9. A non-volatile storage medium, characterized in that, The non-volatile storage medium stores multiple instructions, which are adapted to be loaded by a processor and executed by the phase sequence correction method according to any one of claims 1 to 7.

10. An electronic device, characterized in that, include: One or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to implement the phase sequence correction method according to any one of claims 1 to 7.

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