Guard ring current determination method and apparatus, nonvolatile storage medium, and electronic device

Abstract

The application discloses a method and device for determining a sheath loop current, a nonvolatile storage medium and an electronic device. The method comprises: obtaining connection position information corresponding to a plurality of cables, wherein the connection position information indicates that start and end positions corresponding to different numbers of cables in the plurality of cables are different; determining a segmentation result corresponding to the plurality of cables based on the connection position information; and determining a sheath loop current corresponding to the plurality of cables according to the segmentation result corresponding to the plurality of cables. The application solves the technical problem of inaccurate calculation results of the sheath loop current of the plurality of cables with cross-connection misplacement.

Description

Technical Field

[0001] This application relates to the field of power systems, and more specifically, to a method, apparatus, non-volatile storage medium, and electronic device for determining sheath circulation current. Background Technology

[0002] Cable tunnels, serving as underground power transmission channels in cities, bear the crucial responsibility of transmitting loads from urban power grids. During operation, the cable sheath is subjected to electromagnetic fields of varying directions and intensities, generating 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 not only accelerates cable sheath aging and damages the cable shield insulation but also affects the normal operation of the cable core. Therefore, accurate calculation of sheath current is necessary to develop corresponding protective measures and maintain the safe operation of the power system.

[0003] In related technologies, the measurement of cable sheath circulating current typically utilizes sensors embedded inside the cable to monitor the temperature of various parts of the cable in real time, thereby monitoring the cable's operating status. However, due to the limited number of sensors in actual operation, it is difficult to accurately measure the sheath circulating current generated during cable operation, resulting in significant blind spots in cable sheath circulating current detection. Furthermore, related technologies do not consider the phenomenon that the starting positions of multiple cable circuits are not aligned and that the lengths of the interconnecting segments in each circuit may differ during actual cable laying, leading to large errors in the calculation results and unsatisfactory accuracy of cable sheath circulating current calculations.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This application provides a method, apparatus, non-volatile storage medium, and electronic device for determining sheath circulation current, in order to at least solve the technical problem of unsatisfactory accuracy of sheath circulation current calculation results for multi-circuit cables with cross-interconnection and misalignment.

[0006] According to one aspect of the embodiments of this application, a method for determining sheath circulation current is provided, comprising: acquiring connection position information corresponding to multiple cables respectively, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different; determining the segmentation results corresponding to the multiple cables respectively based on the connection position information; and determining the sheath circulation current corresponding to the multiple cables respectively based on the segmentation results corresponding to the multiple cables respectively.

[0007] Optionally, the connection location information includes the cross-connection joint positions of the corresponding number of cables in the multi-circuit cable. The cross-connection joint positions are the positions where the phase commutation operation of the corresponding number of cables is performed. Based on the connection location information, the segmentation results corresponding to the multi-circuit cable are determined, including: segmenting the multi-circuit cable according to the cross-connection joint positions and start and end points of the multi-circuit cable to obtain multiple segments corresponding to each cable in the multi-circuit cable; and determining the segmentation results corresponding to the multi-circuit cable according to the multiple segments corresponding to each cable.

[0008] Optionally, based on the segmentation results corresponding to each of the multiple cables, the sheath circulation current corresponding to each of the multiple cables is determined, including: determining the segment overlap information between the multiple cables based on the segmentation results corresponding to each of the multiple cables; determining the electrical characteristics corresponding to each of the multiple segments in each cable according to the segment overlap information; and determining the sheath circulation current corresponding to each of the multiple cables based on the electrical characteristics corresponding to each of the multiple segments in each cable.

[0009] Optionally, based on the segment overlap information, the electrical characteristics corresponding to multiple segments in each cable are determined, including: based on the segment overlap information, determining a first type of segment in multiple segments in which each cable does not overlap with other cables; for the first type of segment in multiple segments, determining the cable self-inductance of the first type of segment based on the line facility parameters of each cable, as the electrical characteristic corresponding to the first type of segment.

[0010] Optionally, based on the segment overlap information, the electrical characteristics corresponding to multiple segments in each cable are determined, including: based on the segment overlap information, determining a second type of segment in multiple segments where each cable overlaps with other cables, and each cable maintains a first initial phase sequence while other cables maintain a second initial phase sequence; for the second type of segment in multiple segments, based on the line facility parameters, the first initial phase sequence, and the second initial phase sequence of each cable, determining the cable self-inductance and cable mutual inductance of the second type of segment as the electrical characteristics corresponding to the second type of segment.

[0011] Optionally, based on the segment overlap information, the electrical characteristics corresponding to multiple segments in each cable are determined, including: based on the segment overlap information, identifying a third type of segment in multiple segments where each cable overlaps with other cables and where each cable and any other cable have a phase sequence change; for the third type of segment in multiple segments, based on the line facility parameters and phase sequence change of each cable, determining the cable self-inductance and cable mutual inductance of the third type of segment as the electrical characteristics corresponding to the third type of segment.

[0012] Optionally, based on the segmentation results corresponding to each of the multiple cables, the sheath circulating current corresponding to each of the multiple cables is determined, including: based on the segmentation results corresponding to each of the multiple cables, determining the sheath impedance information and sheath induced potential information corresponding to each of the multiple cables; and based on the sheath impedance information and sheath induced potential information corresponding to each of the multiple cables, determining the sheath circulating current corresponding to each of the multiple cables.

[0013] According to another aspect of the embodiments of this application, a sheath circulation current determination device is provided, comprising: a connection position determination module, configured to acquire connection position information corresponding to multiple cables respectively, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different; a segmentation result determination module, configured to determine the segmentation result corresponding to the multiple cables respectively based on the connection position information; and a sheath circulation current determination module, configured to determine the sheath circulation current corresponding to the multiple cables respectively based on the segmentation result corresponding to the multiple cables respectively.

[0014] According to another aspect of the embodiments of this application, a non-volatile storage medium is provided, which stores a plurality of instructions adapted for a sheath circulation current determination method, any one of which is loaded by a processor.

[0015] 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 sheath circulation determination methods.

[0016] In this embodiment, by obtaining the connection position information corresponding to each of the multiple cables, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different; based on the connection position information, the segmentation results corresponding to each of the multiple cables are determined; and based on the segmentation results corresponding to each of the multiple cables, the sheath circulating current corresponding to each of the multiple cables is determined. This achieves the goal of dividing the multiple cables into segments with different electrical characteristics based on the cross-connection joints and the start and end positions of each cable, and determining the sheath impedance and sheath induced potential of the multiple cables based on these different electrical characteristics. This improves the accuracy of the sheath circulating current calculation results for multiple cables with cross-connection misalignment, thereby solving the technical problem of unsatisfactory accuracy in the sheath circulating current calculation results for multiple cables with cross-connection misalignment. Attached Figure Description

[0017] 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:

[0018] Figure 1 This is a flowchart of an optional method for determining sheath circulation according to an embodiment of this application;

[0019] Figure 2 This is a circuit model diagram of an optional sheath circulation current determination method provided according to an embodiment of this application;

[0020] Figure 3 This is a segmented schematic diagram of an optional method for determining sheath circulation according to an embodiment of this application;

[0021] Figure 4 This is a first schematic diagram of an optional method for determining sheath circulation according to an embodiment of this application;

[0022] Figure 5 This is a second schematic diagram of an optional method for determining sheath circulation according to an embodiment of this application;

[0023] Figure 6 This is a flowchart of an optional method for determining sheath circulation according to an embodiment of this application;

[0024] Figure 7 This is a first cable structure diagram according to an optional sheath circulation current determination method provided in an embodiment of this application;

[0025] Figure 8 This is a second cable structure diagram according to an optional sheath circulation current determination method provided in an embodiment of this application;

[0026] Figure 9 This is a schematic diagram of cable parameters according to an optional method for determining sheath circulation current provided in an embodiment of this application;

[0027] Figure 10 This is a first cable diagram according to an optional sheath circulation current determination method provided in an embodiment of this application;

[0028] Figure 11 This is a second cable diagram according to an optional sheath circulation current determination method provided in an embodiment of this application;

[0029] Figure 12 This is a schematic diagram of an optional sheath circulation determination device provided according to an embodiment of this application. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0033] 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.

[0034] 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.

[0035] According to an embodiment of this application, a method embodiment for determining sheath circulation 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.

[0036] Figure 1 This is a flowchart of an optional method for determining sheath circulation according to an embodiment of this application, such as... Figure 1As shown, the method includes the following steps:

[0037] Step S102: Obtain the connection position information corresponding to each of the multiple cables, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different;

[0038] It is understandable that this involves obtaining the connection location information for each cable in a multi-circuit cable system. This connection location information includes the starting position of each cable and the location of cross-connection joints. Because actual multi-circuit cables have different starting positions and varying cross-connection segment lengths, this can affect the calculation results of cable sheath circulating current. By determining the connection location information of the multi-circuit cables, not only can the accuracy of the sheath circulating current calculation be improved, but the cable laying scheme can also be optimized, reducing sheath circulating current and improving the operating efficiency and safety of the cable system.

[0039] Step S104: Based on the connection location information, determine the segmentation results corresponding to each of the multiple cables;

[0040] It is understandable that, based on the connection location information of each of the multiple cables, the cross-connection joints of each cable are used as segmentation points to segment each cable in the multi-circuit cable, thus determining the segmentation result of the multi-circuit cable. When there are cross-connection misalignments between cables, dividing the cable line into multiple independent segments allows for more precise analysis and calculation of the sheath circulation current in each segment, thereby reducing calculation errors.

[0041] In one optional embodiment, the connection location information includes the cross-connection joint positions of the corresponding number of cables in the multi-circuit cable. The cross-connection joint positions are the positions where the corresponding number of cables undergoes a phase commutation operation. Based on the connection location information, the segmentation results corresponding to the multi-circuit cable are determined, including: segmenting the multi-circuit cable according to the cross-connection joint positions and start and end point positions of the multi-circuit cable to obtain multiple segments corresponding to each cable in the multi-circuit cable; and determining the segmentation results corresponding to the multi-circuit cable according to the multiple segments corresponding to each cable.

[0042] It is understandable that the connection location information of a multi-circuit cable includes the starting position information of each circuit and the location information of the cross-connection joints. The cross-connection joint location is where the cable undergoes a phase commutation operation, i.e., where the phase sequence of the cable changes. Based on the connection location information of the multi-circuit cable, each circuit is segmented, resulting in multiple independent segments and determining the segmentation result of the multi-circuit cable. By considering the impact of cross-connection misalignment in the multi-circuit cable, the cable sheath circulating current can be simulated more accurately, improving the accuracy and reliability of the sheath circulating current calculation results.

[0043] Step S106: Determine the sheath circulation current corresponding to each of the multiple cables based on the segmentation results of each cable.

[0044] It is understandable that, based on the segmentation results of the multi-circuit cable obtained from the connection location information, the sheath circulating current corresponding to each cable in the multi-circuit cable is determined. By considering the cross-interconnection and misalignment of the multi-circuit cables, the electrical behavior of the multi-circuit cable in a real environment can be simulated more accurately, thereby reducing the error in the calculation results of the cable sheath circulating current.

[0045] In one optional embodiment, determining the sheath circulation current corresponding to each of the multiple cables based on the segmentation results of each of the multiple cables includes: determining segment overlap information between the multiple cables based on the segmentation results of each of the multiple cables; determining the electrical characteristics corresponding to multiple segments in each cable according to the segment overlap information; and determining the sheath circulation current corresponding to each of the multiple cables based on the electrical characteristics corresponding to multiple segments in each cable.

[0046] It is understandable that, based on the segmentation results of a multi-circuit cable, the segment overlap information between each circuit in the multi-circuit cable is determined. Based on this segment overlap information, the electrical characteristics of each segment of each circuit are determined, and based on the electrical characteristics of each segment of each circuit, the sheath circulating current of each circuit is determined. Through segmented calculation, the impact of segment overlap and relative position information between cables on the cable sheath circulating current results can be fully considered, improving the accuracy of the sheath circulating current calculation results. This provides accurate cable sheath circulating current data for the operation and maintenance of cable systems, ensuring the safe and stable operation of cables.

[0047] Optionally, the aforementioned electrical characteristics include three types, corresponding to three types of cable segmentation results: Type I segmentation, Type II segmentation, and Type III segmentation. In Type I segmentation, there is no overlap between each cable circuit, and its electrical characteristic is only the cable's self-inductance. In Type II segmentation, there is overlap between each cable circuit, and the phase sequence of each cable is the initial phase sequence (i.e., the phase sequence has not changed). Its electrical characteristics include both the cable's self-inductance and the mutual inductance between cables, while the phase sequence of each cable is the initial phase sequence. In Type III segmentation, there is overlap between each cable circuit, and there are cables with changed phase sequences. Its electrical characteristics include both the cable's self-inductance and the mutual inductance between cables, while there are cables with changed phase sequences. Based on the overlap information and phase sequence change information between cables, the cable can be divided into segments with different electrical characteristics. The cable sheath circulating current can be calculated based on these different electrical characteristics, effectively reducing calculation errors caused by discrepancies between cable layout assumptions and reality, and improving the accuracy of sheath circulating current calculation.

[0048] Optionally, a sheath circulation model for multi-circuit cables can be constructed based on the physical parameters of the multi-circuit cables, the real-time operating parameters of each cable, and the environmental parameters of the transmission corridor. Figure 2 This is a circuit model diagram of an optional sheath circulation current determination method provided according to an embodiment of this application. For example... Figure 2 As shown, there are two cable circuits, and there is a crossover and misalignment between them; that is, the starting positions and crossover joint positions of the two cable circuits are different. These are the three-phase load currents of the first cable. These are the three-phase load currents of the second cable; These are the three-phase sheath circulating currents of the first circuit cable. These are the three-phase sheath circulating currents of the second circuit cable; R e R is the equivalent resistance of the ground loop. dr (r = 1, 2, 3, 4) represents the grounding resistance; J1, J2, J3, and J4 are the cross-connection joints of the two cables.

[0049] Figure 3 This is a segmented schematic diagram of an optional method for determining sheath circulation according to an embodiment of this application. Figure 3 According to Figure 2 The circuit model shown illustrates the segmentation result of dividing the two cables into segments based on the connection location information (i.e., starting location information and cross-connection location information). Figure 3 As shown, based on the starting position and cross-connection position of the two cables, the two cables are divided into 7 segments. Due to the cross-connection misalignment, the two cables in segments D1 and D7 are not parallel, meaning there is no overlap between the two cables, and they belong to the first category of segments. Segment D2 has overlap between the two cables, and the phase sequence of the two cables has not changed, so it belongs to the second category of segments. Segments D3, D4, D5, and D6 have overlap between the two cables, and there are cables with changed phase sequences, so they belong to the third category of segments.

[0050] Figure 4 This is a first schematic diagram of an optional method for determining sheath circulation according to an embodiment of this application, as shown below. Figure 4 The section shown belongs to the first type of segment. For the first type of segment, since there is no overlap between the two cables, only the cable self-inductance exists. For example... Figure 4 As shown, X ii (i = 1, 2, 3) represents the inductive reactance (i.e., cable self-inductance) of the core and sheath of the same circuit cable, where 1, 2, and 3 are the three phases A, B, and C of the first circuit cable. Figure 5 This is a second schematic diagram of an optional method for determining sheath circulation according to an embodiment of this application, as shown below. Figure 5The section shown belongs to either category two or category three. For category two and category three sections, due to the overlap between the two cables, there are both cable self-inductance and mutual inductance between the cables. For example... Figure 5 As shown, X ii (i = 1, 2, 3) represents the inductive reactance (i.e., cable self-inductance) of the core and sheath of the same circuit cable, X ij (i = 1, 2, 3; j = 4, 5, 6) represents the mutual inductance between the two cables, where 1, 2, and 3 are the three phases A, B, and C of the first cable, and 4, 5, and 6 are the three phases A, B, and C of the second cable.

[0051] Optionally, the cable self-inductance X ii The formula is:

[0052]

[0053] Among them, X ii The unit is (Ω / m); π represents pi; f represents the circuit operating frequency, with the unit being 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 s1i d represents the inner diameter of the sheath of the i-th phase cable, in meters (m); s2i This represents the outer diameter of the cable sheath for the i-th phase, in meters (m).

[0054] Cable mutual inductance X ij The formula is:

[0055]

[0056] Among them, X ij The unit is (Ω / m) (ohm / meter); s ij This represents the center-to-center distance between the i-th phase cable and the j-th phase cable, in meters (m).

[0057] In one optional embodiment, the electrical characteristics corresponding to multiple segments in each cable are determined according to the segment overlap information, including: determining a first type of segment in the multiple segments in which each cable does not overlap with other multiple cables according to the segment overlap information; and determining the cable self-inductance of the first type of segment in the multiple segments based on the line facility parameters of each cable as the electrical characteristic corresponding to the first type of segment.

[0058] It is understandable that, based on the segmentation results of multiple cable circuits, segments within each cable circuit are determined to belong to the aforementioned first type of segmentation (i.e., there is no overlap between each cable circuit). The electrical characteristic of the first type of segment is that it only possesses the cable's self-inductance. Based on the line facility parameters and electrical characteristics of the aforementioned first type of segment, the cable self-inductance of the first type of segment is calculated. By identifying and calculating the cable self-inductance of the first type of segment separately, interference from electromagnetic coupling between non-parallel cable segments is avoided, improving the accuracy and reliability of the sheath circulating current calculation results.

[0059] In one optional embodiment, the electrical characteristics corresponding to multiple segments in each cable are determined according to the segment overlap information, including: determining, according to the segment overlap information, a second type of segment in the multiple segments where each cable overlaps with other cables, and each cable maintains a first initial phase sequence while the other cables maintain a second initial phase sequence; for the second type of segment in the multiple segments, based on the line facility parameters of each cable, the first initial phase sequence, and the second initial phase sequence, the cable self-inductance and cable mutual inductance of the second type of segment are determined as the electrical characteristics corresponding to the second type of segment.

[0060] It is understandable that, based on the segmentation results of multiple cable circuits, segments within each cable circuit are identified as belonging to the second type of segmentation mentioned above. This means that there is overlap between each cable circuit, and the phase sequence of each cable circuit is the initial phase sequence (i.e., the first cable circuit uses the first initial phase sequence, and the other cables use the second initial phase sequence), with no change in phase sequence. The electrical characteristics of the second type of segmentation include cable self-inductance and mutual inductance between cables, while the phase sequence of each cable circuit is the initial phase sequence. Based on the line facility parameters, first initial phase sequence, second initial phase sequence, and electrical characteristics of the segments in the second type of segmentation, the cable self-inductance and mutual inductance of the second type of segmentation are calculated. By identifying and calculating the cable self-inductance and mutual inductance of the second type of segmentation, the interference of electromagnetic coupling between parallel cable sections is considered, improving the accuracy and reliability of the sheath circulating current calculation results.

[0061] In one optional embodiment, the electrical characteristics corresponding to multiple segments in each cable are determined according to the segment overlap information, including: determining, according to the segment overlap information, a third type of segment in the multiple segments where each cable overlaps with other cables and where each cable and any other cable have a phase sequence change; for the third type of segment in the multiple segments, based on the line facility parameters and phase sequence change of each cable, determining the cable self-inductance and cable mutual inductance of the third type of segment as the electrical characteristics corresponding to the third type of segment.

[0062] It is understandable that, based on the segmentation results of multiple cable circuits, segments within each cable circuit are identified as belonging to the aforementioned third category of segments. This means that segments overlap between cable circuits and contain cable segments with phase sequence changes. The electrical characteristics of the third category of segments include cable self-inductance and mutual inductance between cables, along with the presence of cables with phase sequence changes. Based on the line facility parameters, phase sequence changes, and electrical characteristics of the third category of segments, the cable self-inductance and mutual inductance of the second category of segments are calculated. By identifying and calculating the cable self-inductance and mutual inductance of the third category of segments, not only is the electromagnetic coupling interference between parallel cable segments considered, but also the impact of cable phase sequence changes on the sheath circulating current calculation results, thus improving the accuracy and reliability of the sheath circulating current calculation results.

[0063] In one optional embodiment, determining the sheath circulating current corresponding to each of the multiple cables based on the segmentation results of each cable includes: determining the sheath impedance information and sheath induced potential information corresponding to each of the multiple cables based on the segmentation results of each cable; and determining the sheath circulating current corresponding to each of the multiple cables based on the sheath impedance information and sheath induced potential information corresponding to each cable.

[0064] It is understandable that, based on the segmentation results of a multi-circuit cable, the segment overlap information between each circuit in the multi-circuit cable is determined. Based on this segment overlap information, the electrical characteristics of each segment of each circuit are determined, and based on these electrical characteristics, the sheath impedance and sheath induced potential of each segment of each circuit are obtained. Based on the sheath impedance and sheath induced potential of each segment of each circuit, the sheath impedance and sheath induced potential of each circuit are determined. Based on the sheath impedance and sheath induced potential of each circuit, Ohm's law is used to determine the sheath circulating current of each circuit. Through segmented calculation, the overlap and relative position information between cable segments, as well as the impact of phase sequence changes on the cable sheath circulating current calculation results, can be fully considered. This can effectively improve the accuracy of the sheath circulating current calculation results, which is of great significance for evaluating cable layout, optimizing cable line design, reducing heat loss, and improving the operating efficiency and safety of cable lines.

[0065] Optionally, the matrix of sheath-induced electromotive force generated by the conductor on the sheath. Can

[0066] Represented as:

[0067]

[0068] in, This is the matrix of the sheath impedance. For the overall grounding impedance, for

[0069] The sum of grounding impedance and equivalent impedance of the earth loop. This is the matrix of the sheath induced current (i.e., sheath circulating current).

[0070] for Figure 2 The two cables shown are divided into the following categories based on their connection location information: Figure 3 The diagram shows seven segments. Based on different segment divisions, the matrix of sheath impedance can be... Divided into 7 parts, then The formula is:

[0071]

[0072] in, For the Dth a The matrix of sheath impedance of the segment.

[0073] Optionally, D a The matrix of sheath impedance of the segment It can be represented as:

[0074]

[0075]

[0076] in, Both are 3×3 matrices, representing the mutual inductance between the two cables under the initial phase sequence state. The superscript 0 indicates that the matrix has undergone 0 translation changes (i.e., 0 phase sequence changes); X ii (i = 1, 2, 3) represents the self-inductance of the cable; X ij (i = 1, 2, 3; j = 4, 5, 6) represents the mutual inductance between the two cables; L a For the Dth a The length of the segment, in meters (m).

[0077] Optionally, the two cables do not overlap in section D1, belonging to the first type of segment; the two cables overlap from section D2 onwards, but the phase sequence remains unchanged, belonging to the second type of segment. Then the sheath impedance matrix of sections D1 and D2 is... and It can be represented as:

[0078]

[0079] Optionally, the two cable sections D3 overlap, and the first circuit crosses at J1, causing a change in the phase sequence of the cable's metallic sheath, classifying it as a third-category segment. Among these, z 11 z 12 z 21 All are affected by cross-interconnection, in order to calculate z needs to be handled separately 11 z12 z 21 Shifting up one row and shifting forward one column, by z 11 For example, after the phase sequence changes It can be represented as:

[0080]

[0081] Similarly, we can obtain and For segment D7, the two circuits of cable do not overlap, belonging to the first type of segment, then Z s7 It can be represented as:

[0082]

[0083] Optionally, for Figure 2 The two cables shown are divided into the following categories based on their connection location information: Figure 3 The diagram shows seven segments. Based on the different segments, the matrix of the induced potential of the sheath can be... point

[0084] If it is divided into 7 parts, then The formula is:

[0085]

[0086] in, For the Dth a The matrix of the induced electromotive force of the protective layer of the segment.

[0087] Based on the influence of electromagnetic induction, for D a Section sheath induced potential matrix The formula is:

[0088]

[0089] in, All are 3×3 matrices, representing the sheath induced potential under the initial phase sequence state between the two cables. The superscript 0 indicates that the matrix has been translated 0 times (i.e., the phase sequence has been changed 0 times). This represents the current matrix of two cable cores, where 1 and 2 represent the number of cable turns, and A, B, and C represent the three phases of the cable, respectively.

[0090] Optionally, the two cables have no overlap in section D1, belonging to the first type of segment; from section D2 onwards, there is overlap, but the phase sequence remains unchanged, belonging to the second type of segment. Then the matrix of the sheath induced electromotive force for sections D1 and D2 is... and It can be represented as:

[0091]

[0092] Optionally, the two cable sections D3 overlap, and the first circuit crosses at J1, causing a change in the phase sequence of the cable's metallic sheath, classifying it as a third-category segment. Among these, e 11 e 12 e 21 All are affected by cross-interconnection, in order to calculate E needs to be addressed separately. 11 e 12 e 21 Shift one line up, starting with e 11 For example, after the phase sequence changes It can be represented as:

[0093]

[0094] Similarly, we can obtain and For section D7, the two cables do not overlap, belonging to the first type of section. It can be represented as:

[0095]

[0096] Based on the matrix of the induced potential of the sheath mentioned above and sheath impedance matrix The sheath circulation matrix of the two cables can be obtained.

[0097] Optionally, if the sheath circulating current of n-circuit cables is to be calculated, the cable segment D can be constructed based on the actual cross-connection segmentation of the cables (i.e., connection location information). a and will Expanded into a 3n-order matrix, Expand to a 3n-dimensional vector, then calculate respectively. Solve in parallel

[0098] Through step S102, the connection position information corresponding to each of the multiple cables is obtained, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different; step S104, based on the connection position information, determines the segmentation results corresponding to each of the multiple cables; step S106, based on the segmentation results corresponding to each of the multiple cables, determines the sheath circulating current corresponding to each of the multiple cables. This method can divide multiple cables into segments with different electrical characteristics based on the cross-connection joints and the start and end positions of each cable, and determine the sheath impedance and sheath induced potential of the multiple cables based on these different electrical characteristics. This achieves the technical effect of improving the accuracy of the sheath circulating current calculation results for multiple cables with cross-connection misalignment, thereby solving the technical problem of unsatisfactory accuracy in the sheath circulating current calculation results for multiple cables with cross-connection misalignment.

[0099] Based on the above embodiments and optional embodiments, this application proposes an optional implementation method for calculating the sheath circulation current of multi-circuit cables with cross-interconnection misalignment. Figure 6 This is a flowchart illustrating an optional method for determining sheath circulation according to an embodiment of this application. Figure 6 As shown, the determination of cable sheath circulation current is divided into three-dimensional digital modeling of the transmission corridor and sheath circulation current deduction. The three-dimensional digital modeling of the transmission corridor is divided into two parts: transmission corridor information acquisition and transmission corridor digital twin modeling.

[0100] like Figure 6 As shown, the information collection for power transmission corridors involves using a 3D laser scanner to acquire 3D point cloud data of the transmission lines and establishing a comprehensive texture data source by integrating existing drawings and on-site photography. This includes spatial data acquisition and texture data acquisition. Spatial data acquisition involves using a ground-based 3D laser scanner to obtain 3D information about the power transmission corridor. Appropriate station locations are selected based on the visibility within the corridor, and parameters such as scanning angular resolution, field of view, and point cloud channels are set according to actual needs. The 3D laser scanner can collect point cloud data of the power transmission corridor and generate a 720-degree panoramic depth image of the corridor after scanning. Preprocessing the point clouds collected from each station, such as stitching and noise reduction, yields the overall spatial data of the power transmission corridor. Texture data acquisition utilizes methods such as robotic patrols to collect 3D spatial data of the cable corridor. By integrating existing drawings, equipment information, and other data, texture mapping is created, and materials such as cameras and lighting are added to form a comprehensive texture data source. Based on the aforementioned spatial and texture data of the power transmission corridor, a 3D model of the corridor is constructed.

[0101] like Figure 6As shown, digital twin modeling of power transmission corridors involves constructing a 3D geometric model of the cable corridor based on collected geometric and texture data, and collecting sensor data deployed within the cable corridor in real time, integrating this data into the 3D model. Specifically, this includes 3D geometric modeling of the power transmission corridor, multivariate data mapping, and panoramic browsing and user interface development. 3D geometric modeling of the power transmission corridor is based on collected spatial and texture data to construct a 3D geometric model of the cable corridor. Texture mapping, lighting rendering, and other methods are used to refine the model, resulting in 3D geometric models of cables, channels, supports, and equipment within the power transmission corridor. Multivariate data mapping involves collecting cable operating status parameters and channel environmental parameters. Sensors deployed within the power transmission corridor can collect real-time sensor values ​​of the cable body and channels, including cable phase load current, cable temperature, grounding current, voltage level, channel water level, and gas conditions. The water level and gas levels in the transmission corridor can be displayed in real time using a 3D dynamic effect; cable status and other information can be dynamically displayed by clicking on the corresponding 3D model; the physical parameters of the cable itself can be obtained from the cable attribute database of the transmission corridor constructed from the cable data manual. Integrating the above information into the 3D geometric model of the transmission corridor yields a 3D digital model of the transmission corridor, enabling 3D model data sharing and collaborative operation. Panoramic browsing and user interface development utilize 3D data visualization tools to display the established 3D scene data, and by developing 3D roaming interactive functions, it supports multi-angle viewing of the 3D structure of the cable itself and the transmission corridor.

[0102] For the simulation of the protective layer circulation, such as Figure 6 As shown, this diagram illustrates the simulation calculation of sheath circulation current for multiple-circuit cables based on a constructed digital twin model of a power transmission corridor. The digital twin model of the power transmission corridor is built upon a 3D model of the corridor and information from a corridor database. The database includes data on the power transmission corridor and environmental parameters. Specifically, the database information includes water level, gas, temperature, and real-time load, geometric properties, and line load of the cables within the corridor. Environmental parameters include soil resistivity and the depth of the geodetic loop. To achieve the simulation calculation of sheath circulation current, based on the digital twin model of the power transmission corridor, the line facility parameters of the multiple-circuit cables are first obtained. Then, based on these line facility parameters and the actual cable laying conditions within the tunnel, a parallel segmented model of the multiple-circuit cables is constructed (i.e., the multiple-circuit cables are segmented according to their connection locations). Based on this model, the sheath impedance matrix and the induced electromotive force matrix of each circuit core on the sheath are established. By connecting these two matrices, the simulated value of the sheath circulation current can be calculated. Finally, the simulation results are mapped onto a 3D digital visualization platform to achieve real-time display of the sheath circulation current simulation.

[0103] The following section further describes the calculation of sheath circulation current. First, based on the established digital twin model, the key parameters (i.e., line facility parameters) required for sheath circulation current calculation are automatically obtained. These line facility parameters include: cable geometric information, such as the number of cable loops, the number of cross-connection segments, the length of each segment, the cable arrangement, and phase distance; cable physical information, such as sheath resistivity and sheath inner and outer diameters; and electrical information, such as operating frequency, load current, and grounding resistance. For cable geometric information, a point cloud clustering algorithm is used to initially cluster the original point cloud. Subsequently, a cylindrical fitting algorithm is used to extract the spatial location information of the transmission cable and the geometric information of the cable body, achieving automatic parameter extraction. For cable physical information, real-time acquisition is achieved by establishing a cable attribute database access interface. For electrical information, real-time acquisition is achieved by establishing a sensor dynamic reading interface.

[0104] Based on the aforementioned line facility parameters, a sheath circulation current model for multi-circuit cross-interconnection and misalignment is established. For typical urban cables, the cable length is relatively short, and the capacitive current can be ignored; therefore, the induced circulation current is mainly considered. Since the length of multiple high-voltage cables laid in tunnels is constrained by various conditions, and the GIS (Gas Insulated Switchgear) terminal locations may differ, therefore, [the model is not described in the original text]. Figure 2 The method of solving the sheath circulation current by staggered segmentation is illustrated using the example of two parallel cables shown. Figure 2 As shown, These are the three-phase load currents of the first cable. These are the three-phase load currents of the second cable; These are the three-phase sheath circulating currents of the first circuit cable. These are the three-phase sheath circulating currents of the second circuit cable; R e R is the equivalent resistance of the ground loop. dr (r = 1, 2, 3, 4) represents the grounding resistance; J1, J2, J3, and J4 are the cross-connection joints of the two cables.

[0105] To analyze the impact of cross-interconnection misalignment on the sheath circulation, Figure 2 The two-circuit cable is virtually segmented using the cross-connection joints and grounding boxes on both sides of each circuit as segmentation points (i.e., cable connection location information), establishing a system as follows: Figure 3 The diagram shows a virtual segmentation of the cable. Figure 3 As shown, the two-circuit cable model is divided into 7 segments, among which J1, J2, J3, and J4 are cross-connectors. Due to the misalignment of the cross-connections, the two cables in segments D1 and D7 are not parallel, meaning there is no overlap between the two cables, belonging to the first type of segmentation. The self-inductance of the first phase sheath of the first cable is as follows: Figure 4As shown. Section D2, due to the overlap between the two cable circuits and the fact that the phase sequence of both cables has not changed, belongs to the second category of sections; sections D3, D4, D5, and D6, due to the overlap between the two cable circuits and the presence of cables with changed phase sequences, belong to the third category of sections. For sections D2, D3, D4, D5, and D6, the self-inductance and mutual inductance of the first phase sheath of the first cable are as follows: Figure 5 As shown.

[0106] The matrix of sheath-induced electromotive force generated by the conductor on the sheath Can

[0107] Represented as:

[0108]

[0109] in, This is the matrix of the sheath impedance. For the overall grounding impedance, for

[0110] The sum of grounding impedance and equivalent impedance of the earth loop. This is the matrix of the sheath induced current (i.e., sheath circulating current).

[0111] Based on different segments, the matrix of sheath impedance can be... Divided into 7 parts, then The formula is:

[0112]

[0113] in, For the Dth a The matrix of sheath impedance of the segment.

[0114] D a The matrix of sheath impedance of the segment It can be represented as:

[0115]

[0116]

[0117] in, Both are 3×3 matrices, representing the mutual inductance between the two cables under the initial phase sequence state. The superscript 0 indicates that the matrix has undergone 0 translation changes (i.e., 0 phase sequence changes); L a For the Dth a The length of the segment, in meters (m); X ii (i = 1, 2, 3) represents the self-inductance of the cable, in units of (Ω / m). X ij(i = 1, 2, 3; j = 4, 5, 6) represents the mutual inductance between the two cables, in units of (Ω / m). Here, 1, 2, and 3 represent the three phases (A, B, C) of the first cable, and 4, 5, and 6 represent the three phases (A, B, C) of the second cable; D e This indicates the depth of the geodetic isotropic loop, in meters (m); s ij ρ represents the center-to-center distance between the i-th phase cable and the j-th phase cable, in meters; g The resistivity of the earth is expressed in Ω·m (ohm-meter); f represents the operating frequency of the line, expressed in Hz (hertz); r i,GMR d represents the geometric mean radius of the cable sheath of phase i, in meters; s1i d represents the inner diameter of the sheath of the i-th phase cable, in meters (m); s2i This represents the outer diameter of the cable sheath for the i-th phase, in meters (m).

[0118] Among them, the two cables in section D1 do not overlap and belong to the first type of section; the two cables run parallel (i.e., overlap) starting from section D2, but the phase sequence does not change, which belongs to the second type of section. Therefore:

[0119]

[0120] Section D3 overlaps, and the first circuit crosses at J1, causing a phase change in the cable's metallic sheath (i.e., a change in phase sequence), classifying it as a third-category segment. Among these, z 11 z 12 z 21 All are affected by cross-interconnection, in order to calculate z needs to be handled separately 11 z 12 z 21 Shifting up one row and shifting forward one column, by z 11 For example, after the phase sequence changes It can be represented as:

[0121]

[0122] Similarly, in section D4, the second cable crosses and interconnects at point J3. Due to the influence of cross-interconnection, z is respectively... 22 z 12 z 21 Perform the same translation transformation as described above. And obtain the results sequentially using the methods described above. For section D7, there is no parallel section between the two cables, which belongs to the first type of section; therefore:

[0123]

[0124] for Figure 2The two cables shown are divided into the following categories based on their connection location information: Figure 3 The diagram shows seven segments. Based on the different segments, the matrix of the induced potential of the sheath can be... point

[0125] If it is divided into 7 parts, then The formula is:

[0126]

[0127] Based on the influence of electromagnetic induction, for D a Section sheath induced potential matrix The formula is:

[0128]

[0129] in, All are 3×3 matrices, representing the sheath induced potential under the initial phase sequence state between the two cables. The superscript 0 indicates that the matrix has been translated 0 times (i.e., the phase sequence has been changed 0 times). This represents the current matrix of two cable cores, where 1 and 2 represent the number of cable turns, and A, B, and C represent the three phases of the cable, respectively.

[0130] The two cables do not overlap in section D1, belonging to the first type of section; overlap begins from section D2, but the phase sequence remains unchanged, belonging to the second type of section. Therefore:

[0131]

[0132]

[0133] The two cable circuits overlap in section D3, and the first circuit crosses at point J1, causing a change in the phase sequence of the cable's metallic sheath, classifying it as a third-category segment. Specifically, e... 11 e 12 e 21 All are affected by cross-interconnection, in order to calculate E needs to be addressed separately. 11 e 12 e 21 Shift one line up, starting with e 11 For example, after the phase sequence changes It can be represented as:

[0134]

[0135] Similarly, in section D4, the second cable crosses and interconnects at point J3. Due to the influence of cross-connection, e is respectively 22 e 12 e 21Perform the same translation transformation as described above. And obtain the results sequentially using the methods described above. For section D7, there is no parallel section between the two cables, which belongs to the first type of section; therefore:

[0136]

[0137] Based on the matrix of the induced potential of the sheath mentioned above and sheath impedance matrix The sheath circulation matrix of the two cables can be obtained.

[0138] Optionally, if the sheath circulating current of n-circuit cables is to be calculated, the cable segment D can be constructed based on the actual cross-connection segmentation of the cables (i.e., connection location information). a and will Expanded into a 3n-order matrix, Expand to a 3n-dimensional vector, then calculate respectively. Solve in parallel

[0139] The method for determining sheath circulation current can be applied to a software application, taking a power transmission corridor in a certain region as an example. Figure 7 This is a first cable structure diagram according to an optional sheath circulation current determination method provided in an embodiment of this application, such as... Figure 7 As shown, two cables, Line 1 (first cable) and Line 2 (second cable), are laid in the corridor. Line 1 connects substation A and substation C and is laid in a small triangular pattern; Line 2 connects substation B and substation C and is laid in a large triangular pattern. Figure 8 This is a second cable structure diagram according to an optional sheath circulation current determination method provided in an embodiment of this application, such as... Figure 8 As shown, the two cables are laid in parallel, and the cable routing is as follows: Figure 8 As shown. The height of both cable supports is 450mm. The phase spacing of the small triangular cable in line one is 146mm, and the cable type is ZR-YJLW02-127 / 220KV-1×1000mm. 2 The spacing between the two main cables on the same floor is 350mm, and the vertical cable spacing is 450mm. The cable type is ZR-YJLW02-127 / 220KV-1×1600mm. 2 The cross-connection distances for Line 1 are 467m, 451m, and 474m respectively; the cross-connection distances for Line 2 are 458m, 458m, and 460m respectively.

[0140] A three-dimensional digital model of the aforementioned power transmission corridor was established. Point cloud data was collected using a three-dimensional laser scanner and ground-based monitoring stations. Existing drawings and equipment information for each piece of equipment in the corridor were integrated to form a comprehensive texture data source. Based on the collected spatial and texture data, a three-dimensional geometric model of the cable corridor was constructed using 3D modeling software. Texture mapping and lighting rendering were then applied to the model to obtain a three-dimensional digital model of the power transmission corridor. Figure 9 This is a schematic diagram of cable parameters according to an optional sheath circulation current determination method provided in an embodiment of this application. It is a visual operation interface for cable attribute parameters, including cable type, operating frequency, operating current, starting position, horizontal phase distance, vertical phase distance, inner diameter of the metal sheath of the three phases of the cable, outer diameter of the metal sheath, and cable resistance information. Figure 9 The cable attribute parameters shown, as well as parameters such as cable voltage level, load current, and ambient temperature, are integrated into the digital model, enabling 3D model data sharing and collaborative operation.

[0141] The core current at a certain moment was selected for analysis. At this moment, the effective value of the core current of line 1 and line 2 was 400A (amperes). The grounding impedance of the two cables was taken as 0.5Ω (ohms). The simulated values ​​of the sheath circulation current of line 1 and line 2 were 32.14A and 30.76A, respectively. Figure 10 This is a first cable diagram according to an optional sheath circulation current determination method provided in an embodiment of this application, such as... Figure 10 As shown, the circulating current of the three-phase sheaths of Line 1 (A, B, and C) is 32.1408A. Figure 11 This is a second cable diagram according to an optional sheath circulation current determination method provided in an embodiment of this application, such as... Figure 11 As shown, the circulating current of the three-phase sheaths of Line 2 (A, B, and C) is 30.7664A. The above data is for illustrative purposes only and is not intended to be specific.

[0142] The above optional implementation methods achieve at least the following effects: based on the connection position information of the multiple cables, the cross-connected and misaligned cables are divided into segments with different electrical characteristics, thereby enabling more precise analysis and calculation of the sheath circulating current of each segment; by constructing a three-dimensional model of the transmission corridor and combining it with digital twin technology to build a three-dimensional digital cable sheath current measurement visualization platform, the analysis and maintenance of the electrical system can be realized.

[0143] 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.

[0144] This embodiment also provides a sheath circulation determining device, which is used to implement the above embodiments and preferred embodiments, and will not be repeated as already described. 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 implementation, or a combination of software and hardware, is also possible and contemplated.

[0145] According to an embodiment of this application, an embodiment of an apparatus for implementing the method for determining the sheath circulation is also provided. Figure 12 This is a schematic diagram of a sheath circulation determining device according to an embodiment of this application, as shown below. Figure 12 As shown, the above-mentioned sheath circulation determination device includes a connection position determination module 1202, a segmentation result determination module 1204, and a sheath circulation determination module 1206. The device will be described below.

[0146] The connection position determination module 1202 is used to obtain the connection position information corresponding to the multiple cables respectively, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different;

[0147] The segmentation result determination module 1204 is connected to the connection position determination module 1202 and is used to determine the segmentation results corresponding to multiple cables based on the connection position information.

[0148] The sheath circulation current determination module 1206 is connected to the segmentation result determination module 1204 and is used to determine the sheath circulation current corresponding to each of the multiple cables based on the segmentation results corresponding to each of the multiple cables.

[0149] In the sheath circulating current determination device provided in this application embodiment, a connection position determination module 1202 is set up to obtain the connection position information corresponding to each of the multiple cables, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different; a segmentation result determination module 1204 is connected to the connection position determination module 1202 and is used to determine the segmentation result corresponding to each of the multiple cables based on the connection position information; a module 1206 is connected to the segmentation result determination module 1204 and is used to determine the sheath circulating current corresponding to each of the multiple cables based on the segmentation result corresponding to each of the multiple cables. This achieves the goal of dividing the multiple cables into segments with different electrical characteristics based on the cross-connection joints and the start and end positions of each cable, and determining the sheath impedance and sheath induced potential of the multiple cables based on the different electrical characteristics. This improves the accuracy of the sheath circulating current calculation results for multiple cables with cross-connection misalignment, thereby solving the technical problem of unsatisfactory accuracy of the sheath circulating current calculation results for multiple cables with cross-connection misalignment.

[0150] 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.

[0151] It should be noted that the connection position determination module 1202, segmentation result determination module 1204, and sheath circulation determination module 1206 mentioned above correspond to steps S102 to S106 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 in a computer terminal.

[0152] 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.

[0153] The aforementioned sheath circulation determination device may further include a processor and a memory. The connection position determination module 1202, the segmentation result determination module 1204, the sheath circulation determination module 1206, etc., are all stored in the memory as program units, and the processor executes the aforementioned program units stored in the memory to realize the corresponding functions.

[0154] 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.

[0155] This application provides a non-volatile storage medium storing a program that, when executed by a processor, implements a method for determining sheath circulation current.

[0156] 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: obtaining connection location information corresponding to multiple cables, wherein the connection location information indicates that the start and end points of different numbers of cables in the multiple cables are different; determining the segmentation results corresponding to each of the multiple cables based on the connection location information; and determining the sheath circulation current corresponding to each of the multiple cables based on the segmentation results. The device described herein may be a server, PC, etc.

[0157] 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: obtaining connection position information corresponding to each of the multiple cables, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different; determining the segmentation results corresponding to each of the multiple cables based on the connection position information; and determining the sheath circulation current corresponding to each of the multiple cables based on the segmentation results corresponding to each of the multiple cables.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0163] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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 method for determining sheath circulation, characterized in that, include: Obtain connection position information corresponding to each of the multiple loop cables, wherein the connection position information indicates that the start and end points of different numbers of loop cables in the multiple loop cables are different; Based on the connection location information, the segmentation results corresponding to the multiple cables are determined, wherein the segmentation results are classified into three categories: first category segmentation, second category segmentation, and third category segmentation. The first category segmentation consists of segments of the multiple cables that do not overlap, and their electrical characteristics are limited to the cable's self-inductance. The second category segmentation consists of segments that overlap between the multiple cables, and the phase sequence of the multiple cables is the initial phase sequence. The third category segmentation consists of segments that overlap between the multiple cables, and there are cables that do not have the initial phase sequence. Based on the segmentation results corresponding to the multiple cables, the sheath circulation current corresponding to each of the multiple cables is determined.

2. The method according to claim 1, characterized in that, The connection location information includes the cross-connection joint positions of corresponding cables in the multi-circuit cable. The cross-connection joint positions are the positions where phase commutation operations are performed on the corresponding cables. Determining the segmentation results corresponding to each of the multi-circuit cable based on the connection location information includes: Based on the cross-connection joint positions and start and end points of the multi-circuit cables, the multi-circuit cables are segmented to obtain multiple segments corresponding to each circuit in the multi-circuit cable. Based on the multiple segments corresponding to each cable, the segmentation results corresponding to each of the multiple cables are determined.

3. The method according to claim 1, characterized in that, The step of determining the sheath circulation current corresponding to each of the multiple cable circuits based on the segmentation results includes: Based on the segmentation results corresponding to the multiple cables, the segment overlap information between the multiple cables is determined; Based on the segment overlap information, determine the electrical characteristics corresponding to each segment in each cable. Based on the electrical characteristics of the multiple segments in each cable, the sheath circulation current corresponding to each of the multiple cables is determined.

4. The method according to claim 3, characterized in that, The step of determining the electrical characteristics corresponding to multiple segments in each cable according to the segment overlap information includes: Based on the paragraph overlap information, a first type of segment is determined among the plurality of paragraphs in which each loop cable does not overlap with other loop cables; For the first type of segment among the multiple segments, the cable self-inductance of the first type of segment is determined based on the line facility parameters of each cable, and is used as the electrical characteristic corresponding to the first type of segment.

5. The method according to claim 3, characterized in that, The step of determining the electrical characteristics corresponding to multiple segments in each cable according to the segment overlap information includes: Based on the segment overlap information, a second type of segmentation is determined in which each cable overlaps with other cables in the plurality of segments, and each cable maintains a first initial phase sequence, while the other cables maintain a second initial phase sequence; For the second type of segment among the multiple segments, based on the line facility parameters of each cable, the first initial phase sequence, and the second initial phase sequence, the cable self-inductance and cable mutual inductance of the second type of segment are determined as the electrical characteristics corresponding to the second type of segment.

6. The method according to claim 3, characterized in that, The step of determining the electrical characteristics corresponding to multiple segments in each cable according to the segment overlap information includes: According to the paragraph overlap information, it is determined that each cable overlaps with other cables in the plurality of paragraphs, and that each cable and any one of the other cables has a phase sequence change in a third type of segment. For the third type of segment among the multiple segments, based on the line facility parameters of each cable and the phase sequence change, the cable self-inductance and cable mutual inductance of the third type of segment are determined as the electrical characteristics corresponding to the third type of segment.

7. The method according to any one of claims 1 to 6, characterized in that, The step of determining the sheath circulation current corresponding to each of the multiple cable circuits based on the segmentation results includes: Based on the segmentation results corresponding to the multiple cables, determine the sheath impedance information and sheath induced potential information corresponding to the multiple cables. Based on the sheath impedance information and sheath induced potential information corresponding to the multiple cables, the sheath circulating current corresponding to the multiple cables is determined.

8. A device for determining sheath circulation, characterized in that, include: The connection position determination module is used to obtain connection position information corresponding to the multiple cables respectively, wherein the connection position information indicates that the start and end points of different numbers of cables in the multiple cables are different; The segmentation result determination module is used to determine the segmentation results corresponding to the multiple cables based on the connection location information. The segmentation results are categorized into three types: first-type segmentation, second-type segmentation, and third-type segmentation. The first-type segmentation consists of segments of the multiple cables that do not overlap, and their electrical characteristics are limited to the cable's self-inductance. The second-type segmentation consists of segments that overlap between the multiple cables, and all segments have the initial phase sequence. The third-type segmentation consists of segments that overlap between the multiple cables, and some segments do not have the initial phase sequence. The sheath circulation current determination module is used to determine the sheath circulation current corresponding to each of the multiple cables based on the segmentation results corresponding to each of the multiple cables.

9. A non-volatile storage medium, characterized in that, The non-volatile storage medium stores multiple instructions adapted for loading by a processor and executing the sheath circulation determination 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 sheath circulation determination method according to any one of claims 1 to 7.

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