Sheath ring current determination method and device, nonvolatile storage medium and electronic equipment

Abstract

The invention discloses a sheath ring current determination method and device, a nonvolatile storage medium and electronic equipment. The method comprises the steps that connection position information corresponding to a plurality of cables is acquired, and the connection position information indicates that starting and ending point positions corresponding to different numbers of cables in the plurality of cables are different; based on the connection position information, determining segmentation results respectively corresponding to the multi-loop cable; and according to the segmentation results respectively corresponding to the multi-loop cable, determining sheath ring currents respectively corresponding to the multi-loop cable. According to the invention, the technical problem that the accuracy of the sheath circulation calculation result of the multi-loop cable with cross interconnection dislocation is not ideal is solved.

Description

Technical Field

[0001] The present application relates to the field of power systems, and in particular, to a method and device for determining sheath circulating current, a non-volatile storage medium, and an electronic device. Background Art

[0002] As an underground power channel in the city, the cable corridor undertakes the task of transmitting important loads of the urban power grid. During the operation of the cable, the cable sheath will be affected by electromagnetic fields of different directions and intensities, generating cable sheath current. As the voltage level of the power system and the transmission capacity of the transmission line increase, the cable sheath current also increases. Excessive cable sheath circulating current will not only accelerate the aging of the cable sheath, damage the insulation of the cable shielding layer, and affect the normal operation of the cable core. Therefore, it is necessary to accurately calculate the cable sheath circulating current, and then formulate corresponding protective measures to maintain the safe operation of the power system.

[0003] In the related art, the measurement of cable sheath circulation usually uses sensors buried inside the cable to detect the temperature of various parts of the cable in real time to monitor the cable operation status. However, due to the limited number of sensors in actual operation, it is difficult to accurately measure the sheath circulation generated during the operation of the cable, resulting in a large blind spot in the detection of cable sheath circulation. At the same time, in the related art, the calculation of multi-circuit cable sheath circulation does not take into account the phenomenon that the starting positions are not aligned and the lengths of the cross-connected segments of each circuit are different during the actual laying of the cable, resulting in large errors in the calculation results and the problem of unsatisfactory accuracy of the cable sheath circulation calculation results.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present application provide a method, device, non-volatile storage medium and electronic device for determining sheath circulation current, so as to at least solve the technical problem that the calculation result of sheath circulation current of multi-circuit cables with cross-connection misalignment is not accurate enough.

[0006] According to one aspect of an embodiment of the present application, a method for determining a sheath circulation current is provided, comprising: obtaining connection position information corresponding to a plurality of cables, wherein the connection position information indicates that the start and end positions of cables with different numbers of loops in the plurality of cables are different; based on the connection position information, determining segmentation results corresponding to the plurality of cables; and determining the sheath circulation currents corresponding to the plurality of cables according to the segmentation results corresponding to the plurality of cables.

[0007] Optionally, the connection position information includes the cross-connection joint position of the corresponding number of cables in the multi-circuit cable, the cross-connection joint position is the position where the corresponding number of cables performs a phase change operation, and based on the connection position information, the segmentation results corresponding to the multi-circuit cables are determined, including: based on the cross-connection joint positions and start and end point positions corresponding to the multi-circuit cables, segmenting the multi-circuit cables respectively to obtain multiple sections corresponding to each cable included in the multi-circuit cable; based on the multiple sections corresponding to each cable, determining the segmentation results corresponding to the multi-circuit cables.

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

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

[0010] Optionally, according to the section overlap information, electrical characteristics corresponding to multiple sections in each cable are determined, including: according to the section overlap information, determining in multiple sections a second type of segment in which each cable overlaps with other cables, and each cable maintains a first initial phase sequence, and other cables maintain a second initial phase sequence; for the second type of segment in the multiple sections, based on the line facility parameters of each cable, the first initial phase sequence, and the second initial phase sequence, 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, electrical characteristics corresponding to multiple sections in each cable are determined according to the section overlap information, including: according to the section overlap information, determining in multiple sections that each cable overlaps with other cables, and that each cable has a third-category segment with a phase sequence change in any of the other cables; for the third-category segments in the multiple sections, based on the line facility parameters and phase sequence changes of each cable, determining the cable self-inductance and cable mutual inductance of the third-category segment as the electrical characteristics corresponding to the third-category segment.

[0012] Optionally, according to the segmentation results corresponding to the multiple cables, the sheath circulating currents corresponding to the multiple cables are determined, including: according to the segmentation results corresponding to the multiple cables, the sheath impedance information and the sheath induced potential information corresponding to the multiple cables are determined; based on the sheath impedance information and the sheath induced potential information corresponding to the multiple cables, the sheath circulating currents corresponding to the multiple cables are determined.

[0013] According to another aspect of an embodiment of the present application, a sheath circulation determination device is provided, comprising: a connection position determination module, used to obtain connection position information corresponding to multiple cables, wherein the connection position information indicates that the starting and ending points of different cables in the multiple cables are different; a segmentation result determination module, used to determine the segmentation results corresponding to the multiple cables based on the connection position information; and a sheath circulation determination module, used to determine the sheath circulations corresponding to the multiple cables according to the segmentation results corresponding to the multiple cables.

[0014] According to another aspect of an embodiment of the present application, a non-volatile storage medium is provided. The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing any one of the sheath circulation determination methods.

[0015] According to another aspect of an embodiment of the present application, an electronic device is provided, comprising: 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 one or more processors, the one or more processors implement any one of the methods for determining a sheath circulation.

[0016] In the embodiment of the present application, by obtaining the connection position information corresponding to the multiple-circuit cables, wherein the connection position information indicates that the starting and ending points of different number of cables in the multiple-circuit cables are different; based on the connection position information, the segmentation results corresponding to the multiple-circuit cables are determined; according to the segmentation results corresponding to the multiple-circuit cables, the sheath circulation corresponding to the multiple-circuit cables is determined. The purpose of dividing the multiple-circuit cables into sections with different electrical characteristics according to the cross-connection joints of the multiple-circuit cables with cross-connection dislocation and the starting and ending positions of each cable is achieved, and the sheath impedance and sheath induced potential of the multiple-circuit cables are determined based on the different electrical characteristics, achieving the technical effect of improving the accuracy of the sheath circulation calculation results for the multiple-circuit cables with cross-connection dislocation, thereby solving the technical problem that the accuracy of the sheath circulation calculation results for the multiple-circuit cables with cross-connection dislocation is not ideal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 is a flow chart of an optional method for determining sheath circulation provided according to an embodiment of the present application;

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

[0020] Figure 3 It is a schematic diagram of a segmented view of an optional method for determining sheath circulation provided in an embodiment of the present application;

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

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

[0023] Figure 6 It is a flowchart of an optional method for determining sheath circulation provided in an embodiment of the present application;

[0024] Figure 7 is a first cable structure diagram of an optional sheath circulation determination method provided in an embodiment of the present application;

[0025] Figure 8 is a second cable structure diagram of an optional sheath circulation determination method provided in an embodiment of the present application;

[0026] Fig. 9 It is a cable parameter schematic diagram of an optional sheath circulation determination method provided in an embodiment of the present application;

[0027] Fig.10 is a first cable diagram of an optional sheath circulation determination method provided according to an embodiment of the present application;

[0028] Fig.11 is a second cable diagram of an optional sheath circulation determination method provided in an embodiment of the present application;

[0029] Fig.12 It is a schematic diagram of an optional sheath circulation determination device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] For the convenience of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0033] Digital twin technology is a simulation process that integrates multiple disciplines, multiple physical quantities, multiple scales, and multiple probabilities. It can create digital mappings of physical entities in virtual space to reflect the entire life cycle of physical entities from design, manufacturing, operation to maintenance and scrapping, and provide accurate and efficient support for the optimal design, predictive maintenance, fault diagnosis and health monitoring of products and systems.

[0034] A transmission corridor, also known as a power corridor or power tunnel, is an underground or ground channel structure used to centrally accommodate, lay and maintain power cables, communication cables and other electrical equipment. Transmission corridors have long distances and large capacities and are often used in urban underground power grids, large industrial areas, cross-sea cable systems and other scenarios.

[0035] According to an embodiment of the present application, a method embodiment for determining a sheath circulation is provided. It should be noted that the steps shown in the flowchart of 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 can be executed in an order different from that shown here.

[0036] Figure 1 is a flow chart of an optional method for determining sheath circulation provided in an embodiment of the present application, such as Figure 1As shown, the method comprises the following steps:

[0037] Step S102, obtaining connection position information corresponding to the multiple cables, wherein the connection position information indicates that the starting and ending points of different cables in the multiple cables are different;

[0038] It can be understood that the connection position information of each cable in the multi-circuit cable is obtained. The connection position information includes the starting position information and the cross-connection joint position information of each cable. Since the multi-circuit cables actually laid have different starting positions and different cross-connection segment lengths, the calculation results of the cable sheath circulation will be affected. By determining the connection position information of the multi-circuit cables, not only the accuracy of the sheath circulation calculation results can be improved, but also the cable laying plan can be optimized, the sheath circulation can be reduced, and the operation efficiency and safety of the cable system can be improved.

[0039] Step S104, determining the segmentation results corresponding to the multiple cables respectively based on the connection position information;

[0040] It can be understood that according to the connection position information corresponding to the multiple cables, the cross-connection joint position of each cable is used as the segmentation point, and each cable in the multiple cables is segmented to determine the segmentation result of the multiple cables. When there is cross-connection misalignment between cables, by dividing the cable line into multiple independent sections, the sheath circulation of each section can be analyzed and calculated more precisely, thereby reducing the calculation error.

[0041] In an optional embodiment, the connection position 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 perform phase switching operations, and based on the connection position information, the segmentation results corresponding to the multi-circuit cables are determined, including: based on the cross-connection joint positions and start and end point positions corresponding to the multi-circuit cables, the multi-circuit cables are segmented respectively to obtain multiple sections corresponding to each cable included in the multi-circuit cable; based on the multiple sections corresponding to each cable, the segmentation results corresponding to the multi-circuit cables are determined.

[0042] It can be understood that the connection position information of the multi-circuit cable includes the starting position information of each cable and the cross-connection joint position information. Among them, the cross-connection joint position is the position where the cable performs phase switching operation, that is, the position where the phase sequence of the cable changes. According to the connection position information of the multi-circuit cable, each cable in the multi-circuit cable is segmented, and then each cable is divided into multiple independent sections to determine the segmentation result of the multi-circuit cable. By considering the influence of the cross-connection misalignment of the multi-circuit cable, the cable sheath circulation can be simulated more accurately, and the accuracy and reliability of the sheath circulation calculation results are improved.

[0043] Step S106, determining the sheath circulation currents corresponding to the multiple cables respectively according to the segmentation results corresponding to the multiple cables respectively.

[0044] It can be understood that according to the segmentation result of the multi-circuit cable obtained based on the connection position information of the multi-circuit cable, the sheath circulation corresponding to each cable in the multi-circuit cable is determined. By considering the cross-interconnection dislocation of the multi-circuit cable, the electrical behavior of the multi-circuit cable in the real environment can be simulated more accurately, thereby reducing the error of the cable sheath circulation calculation result.

[0045] In an optional embodiment, the sheath circulation currents corresponding to the multiple cables are determined according to the segmentation results corresponding to the multiple cables, including: determining the segment overlap information between the multiple cables based on the segmentation results corresponding to the multiple cables; determining the electrical characteristics corresponding to the multiple segments in each cable according to the segment overlap information; determining the sheath circulation currents corresponding to the multiple cables based on the electrical characteristics corresponding to the multiple segments in each cable.

[0046] It can be understood that according to the segmentation results of the multi-circuit cables, the overlapping information of the sections between each cable in the multi-circuit cables is determined. According to the above overlapping information of the sections, the electrical characteristics of each section of each cable are determined, and according to the electrical characteristics of each section of each cable, the sheath circulation of each cable is determined. Through segmented calculation, the influence of the overlapping sections and relative position information between cables on the sheath circulation results of the cables can be fully considered, which improves the accuracy of the sheath circulation calculation results, provides accurate cable sheath circulation data for the operation and maintenance of the cable system, and ensures the safe and stable operation of the cables.

[0047] Optionally, the above electrical characteristics include three types, and the corresponding cable segmentation results are three types, namely, first-class segmentation, second-class segmentation, and third-class segmentation. Among them, there is no overlap between each cable in the first-class segmentation, and its electrical characteristics are that it only has the self-inductance of the cable; there is overlap between each cable in the second-class segmentation, and the phase sequence of each cable is the initial phase sequence, that is, the phase sequence has not changed, and its electrical characteristics are that it has the self-inductance of the cable and the mutual inductance between the cables, and the phase sequence of each cable is the initial phase sequence; there is overlap between each cable in the third-class segmentation, and there are cables with changed phase sequences, and its electrical characteristics are that it has the self-inductance of the cable and the mutual inductance between the cables, and there are cables with changed phase sequences. According to the overlapping information and phase sequence change information between cables, the cable can be divided into sections with different electrical characteristics, and the cable sheath circulating current is calculated according to different electrical characteristics, which effectively reduces the calculation error caused by the cable layout assumption not being consistent with the actual situation, and improves the accuracy of the sheath circulating current calculation.

[0048] Optionally, a sheath circulation model of the multi-circuit cables may be constructed according to 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 is a circuit model diagram of an optional method for determining sheath circulation current provided in an embodiment of the present application. Figure 2 As shown, there are two cables in total, and there is a cross-connection misalignment between the two cables, that is, the starting position and cross-connection joint position of the two cables are different. are the three-phase load currents of the first cable, They are the three-phase load currents of the second cable respectively; They are the three-phase sheath circulating current of the first cable, are the three-phase sheath circulating current of the second cable; R e is the earth loop equivalent resistance, R dr (r=1, 2, 3, 4) is the grounding resistance; J1, J2, J3, J4 are the cross-connection joints of the two cables respectively.

[0049] Figure 3 is a schematic diagram of a segmented view of an optional method for determining sheath circulation provided in an embodiment of the present application, Figure 3 Based on Figure 2 The circuit model shown in FIG. 1 is a schematic diagram of the segmentation result of segmenting the two cables based on the connection position information of the two cables (i.e., the starting position information and the cross-connection joint position information). Figure 3 As shown in the figure, according to the starting position of the two cables and the position of the cross-connection joints, the two cables are divided into 7 sections. Due to the cross-connection misalignment, the two cables in sections D1 and D7 are not parallel, that is, there is no overlap between the two cables, which belongs to the first type of segmentation; section D2 belongs to the second type of segmentation because there is overlap between the two cables and the phase sequence of the two cables has not changed; sections D3, D4, D5, and D6 belong to the third type of segmentation because there is overlap between the two cables and there are cables with changed phase sequences.

[0050] Figure 4 is a first schematic diagram of an optional method for determining sheath circulation provided in an embodiment of the present application, such as Figure 4 The segment shown belongs to the first type of segmentation. For the first type of segmentation, since there is no overlap between the two cables, only the cable self-inductance exists. Figure 4 As shown, X ii (i=1, 2, 3) represents the inductive reactance of the cable core and sheath in the same loop (i.e., the self-inductive reactance of the cable), where 1, 2, and 3 are the ABC three phases of the first loop cable. Figure 5 is a second schematic diagram of an optional method for determining sheath circulation provided in an embodiment of the present application, such as Figure 5The segments shown belong to the second or third category. For the second and third category segments, since there is overlap between the two cables, there is both cable self-inductance and mutual inductance between the cables. Figure 5 As shown, X ii (i=1, 2, 3) represents the inductive reactance of the cable core and sheath (i.e., the self-inductive reactance of the cable), X ij (i=1, 2, 3; j=4, 5, 6) represents the mutual inductance between the two cables, where 1, 2, 3 are the ABC three-phases of the first cable, and 4, 5, 6 are the ABC three-phases of the second cable.

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

[0052]

[0053] Among them, X ii The unit of is (Ω / m) (ohm / meter); π represents pi; f represents the circuit operating frequency, the unit is Hz (Hertz); D e Indicates the depth of the earth's equivalent loop, in m (meter); r i,GMR represents the geometric mean radius of the i-th phase cable sheath, in m; ρ g Represents the earth resistivity, the unit is Ω·m (ohm·meter); d s1i Indicates the inner diameter of the cable sheath of phase i, in m (meter); d s2i Represents the outer diameter of the cable sheath of the i-th phase, in meters.

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

[0055]

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

[0057] In an optional embodiment, electrical characteristics corresponding to multiple sections in each cable are determined according to section overlap information, including: according to the section overlap information, determining in multiple sections the first type of segments in each cable that do not overlap with other cables; for the first type of segments in the multiple sections, based on the line facility parameters of each cable, determining the cable self-inductance of the first type of segments as the electrical characteristic corresponding to the first type of segments.

[0058] It can be understood that according to the segmentation results of multiple cables, it is determined that the sections in each cable belong to the above-mentioned first-category segmentation sections (that is, there is no overlap between each cable). The electrical characteristics of the first-category segmentation are that it only has the self-inductance of the cable. According to the line facility parameters and electrical characteristics of the above-mentioned first-category segmentation sections, the cable self-inductance of the first-category segmentation sections is calculated. By identifying and separately calculating the cable self-inductance of the first-category segmentation, the interference of electromagnetic coupling between non-parallel segment cables is avoided, and the accuracy and reliability of the sheath circulation calculation results are improved.

[0059] In an optional embodiment, electrical characteristics corresponding to multiple sections in each cable are determined according to section overlap information, including: according to the section overlap information, determining in multiple sections a second type of segment in which each cable overlaps with other cables, and each cable maintains a first initial phase sequence, and other cables maintain a second initial phase sequence; for the second type of segment in the multiple sections, based on the line facility parameters of each cable, the first initial phase sequence, and the second initial phase sequence, 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.

[0060] It can be understood that according to the segmentation results of multiple cables, it is determined that the sections in each cable belong to the above-mentioned second-type segmentation sections, that is, there is overlap between each cable, and the phase sequence of each cable is the initial phase sequence (that is, the first cable is the initial first initial phase sequence, and the other cables are the initial second initial phase sequence), and the phase sequence has not changed. The electrical characteristics of the second-type segmentation are the self-inductance of the cable and the mutual inductance between the cables, and the phase sequence of each cable is the initial phase sequence. According to the line facility parameters, the first initial phase sequence, the second initial phase sequence and the electrical characteristics of the above-mentioned second-type segmentation sections, the cable self-inductance and cable mutual inductance of the second-type segmentation sections are calculated. By identifying and calculating the cable self-inductance and cable mutual inductance of the second-type segmentation, the interference of electromagnetic coupling between parallel segment cables is taken into account, and the accuracy and reliability of the sheath circulation calculation results are improved.

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

[0062] It can be understood that according to the segmentation results of multiple cables, it is determined that the sections in each cable belong to the above-mentioned third-category segmentation sections, that is, there are overlaps between each cable, and there are sections of cables with changed phase sequences. The electrical characteristics of the third-category segmentation are the self-inductance of the cable, the mutual inductance between the cables, and the existence of cables with changed phase sequences. According to the line facility parameters, phase sequence changes and electrical characteristics of the above-mentioned third-category segmented sections, the cable self-inductance and cable mutual inductance of the second-category segmented sections are calculated. By identifying and calculating the cable self-inductance and cable mutual inductance of the third-category segmentation, not only the interference of electromagnetic coupling between parallel segment cables is considered, but also the influence of cable phase sequence changes on the sheath circulating current calculation results are considered, thereby improving the accuracy and reliability of the sheath circulating current calculation results.

[0063] In an optional embodiment, the sheath circulating currents corresponding to the multiple cables are determined according to the segmentation results corresponding to the multiple cables, including: determining the sheath impedance information and sheath induced potential information corresponding to the multiple cables according to the segmentation results corresponding to the multiple cables; determining the sheath circulating currents corresponding to the multiple cables based on the sheath impedance information and sheath induced potential information corresponding to the multiple cables.

[0064] It can be understood that according to the segmentation results of the multi-circuit cables, the overlapping information of the sections between each cable in the multi-circuit cables is determined. According to the above-mentioned overlapping information of the sections, the electrical characteristics of each section of each cable are determined, and according to the electrical characteristics of each section of each cable, the sheath impedance and sheath induced potential of each section of each cable are obtained. Based on the sheath impedance and sheath induced potential of each section of each cable, the sheath impedance and sheath induced potential of each cable are determined. According to the sheath impedance and sheath induced potential of each cable, the sheath circulating current of each cable is determined using Ohm's law. Through segmented calculation, the overlapping sections and relative position information between cables, as well as the influence of phase sequence changes on the calculation results of cable sheath circulating current can be fully considered, which can effectively improve the accuracy of the calculation results of sheath circulating current, 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 potential generated by the core on the sheath Can

[0066] It is expressed as:

[0067]

[0068] in, is the matrix of sheath impedance, is the grounding integrated impedance, for

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

[0070] for Figure 2 The two cables shown in the figure are divided into the following types according to their connection position information: Figure 3 According to the different segments, the matrix of sheath impedance can be Divided into 7 parts, The formula is:

[0071]

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

[0073] Optionally, D a Segment sheath impedance matrix It can be expressed as:

[0074]

[0075]

[0076] in, are all 3×3 matrices, representing the mutual inductance between the two cables under the initial phase sequence state. The superscript 0 indicates that the number of matrix translation changes is 0 (that is, the number of phase sequence changes is 0); 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 D a The length of the segment, in meters.

[0077] Optionally, the two cables have no overlap in D1 section, which belongs to the first type of segmentation; the two cables overlap from D2 section, but the phase sequence does not change, which belongs to the second type of segmentation. Then the matrix of the sheath impedance of D1 section and D2 section is and It can be expressed as:

[0078]

[0079] Optionally, the two cable D3 segments overlap, and the first line is cross-connected at J1, and the phase sequence of the cable metal sheath changes, which belongs to the third type of segmentation. 11 、z 12 、z 21 are all affected by cross-connection, which is calculated Need to be separately 11 、z12 、z 21 Move up one row and forward one column, with z 11 For example, after the phase sequence changes It can be expressed as:

[0080]

[0081] Similarly, we can obtain and For the D7 segment, the two cables do not overlap and belong to the first type of segmentation, so Z s7 It can be expressed as:

[0082]

[0083] Optionally, for Figure 2 The two cables shown in the figure are divided into the following types according to their connection position information: Figure 3 The 7 segments shown. According to the different segments, the matrix of the sheath induced potential can be point

[0084] For 7 parts, The formula is:

[0085]

[0086] in, For D a Matrix of the sheath induced potential of the segments.

[0087] According to the influence of electromagnetic induction, for D a Sheath induced potential matrix The formula is:

[0088]

[0089] in, They are all 3×3 matrices, which respectively represent the sheath induced potential under the initial phase sequence state between the two cables. The superscript 0 means that the number of matrix translation changes is 0 times (that is, the number of phase sequence changes is 0 times); It represents the current matrix of two-circuit cable core wires, 1 and 2 represent the number of cables, and A, B, and C represent the three phases of the cable respectively.

[0090] Optionally, the two cable segments D1 do not overlap, which belongs to the first type of segmentation; from segment D2 onwards, there is overlap, but the phase sequence does not change, which belongs to the second type of segmentation. Then the matrix of the sheath induced potential of segment D1 and segment D2 is and It can be expressed as:

[0091]

[0092] Optionally, the two cable D3 segments overlap, and the first line is cross-connected at J1, and the phase sequence of the cable metal sheath changes, which belongs to the third type of segmentation. 11 、e 12 、e 21 are all affected by cross-connection, which is calculated e 11 、e 12 、e 21 Move up one line, with e 11 For example, after the phase sequence changes It can be expressed as:

[0093]

[0094] Similarly, we can obtain and For the D7 segment, the two cables do not overlap and belong to the first type of segmentation. It can be expressed as:

[0095]

[0096] According to the above matrix of sheath induced potential and sheath impedance matrix The sheath circulating current matrix of the two cables can be obtained

[0097] Alternatively, if the sheath circulation of n cables is calculated, the cable segment D can be constructed according to the actual cross-connection segmentation of the cables (i.e., the connection location information). a , and Expanded to a 3n-order matrix, Expanded to a 3n-dimensional vector, and then calculated separately Solving the problem by parallel equations

[0098] Through the above step S102, the connection position information corresponding to the multiple cables is obtained, wherein the connection position information indicates that the starting and ending points of different cables in the multiple cables are different; step S104, based on the connection position information, the segmentation results corresponding to the multiple cables are determined; step S106, according to the segmentation results corresponding to the multiple cables, the sheath circulation corresponding to the multiple cables is determined. It can be achieved that according to the cross-connection joints of the multiple cables with cross-connection dislocation and the starting and ending positions of each cable, the multiple cables are divided into sections with different electrical characteristics, and the sheath impedance and sheath induced potential of the multiple cables are determined based on the different electrical characteristics, achieving the technical effect of improving the accuracy of the sheath circulation calculation results for the multiple cables with cross-connection dislocation, thereby solving the technical problem that the accuracy of the sheath circulation calculation results for the multiple cables with cross-connection dislocation is not ideal.

[0099] Based on the above embodiments and optional embodiments, the present application proposes an optional implementation method for calculating the sheath circulation of a multi-circuit cable with cross-connection misalignment. Figure 6 is a flowchart of an optional method for determining sheath circulation provided in an embodiment of the present application, such as Figure 6 As shown in the figure, the cable sheath circulation determination is divided into three-dimensional digital modeling of the transmission corridor and sheath circulation deduction. For the three-dimensional digital modeling of the transmission corridor, it is divided into two parts: transmission corridor information collection and transmission corridor digital twin modeling.

[0100] like Figure 6 As shown in the figure, for the information collection of the transmission corridor, a 3D laser scanner is used to obtain the 3D point cloud data of the transmission line, and a comprehensive texture data source is established by integrating existing drawings, on-site field shooting, etc. Specifically, it includes spatial data acquisition and texture data acquisition. Spatial data acquisition is to obtain the 3D information of the transmission corridor by setting up a ground 3D laser scanner. According to the visual conditions in the corridor, a suitable station location is selected, and the scanning angular resolution, field of view, point cloud channel and other parameters are set according to actual needs. The point cloud data of the transmission corridor can be collected by a 3D laser scanner, and a 720-degree panoramic depth image of the transmission corridor is generated after the scanning. The point cloud collected by each measuring station is pre-processed by splicing and denoising to obtain the overall spatial data of the transmission corridor. Texture data acquisition can use robot cruising and other means to collect the 3D spatial data of the cable corridor, and by integrating existing drawings, equipment information and other materials, texture mapping is produced, and materials such as cameras and lights are added to form a comprehensive texture data source. The transmission corridor is 3D modeled according to the spatial data and texture data of the above-mentioned transmission corridor.

[0101] like Figure 6As shown in the figure, for the digital twin modeling of the transmission corridor, the three-dimensional geometric model of the cable corridor is constructed based on the collected geometric data and texture data, and the sensor data arranged in the cable corridor is collected in real time, and these data are integrated into the three-dimensional model. Specifically, it includes three-dimensional geometric modeling of the transmission corridor, multivariate data mapping, and panoramic browsing and user interface development. The three-dimensional geometric modeling of the transmission corridor is based on the collected spatial data and texture data to construct a three-dimensional geometric model of the cable corridor, and the model is refined by methods such as texture mapping and lighting rendering to obtain the three-dimensional geometric model of the cables, channels, brackets, and equipment in the transmission corridor. Multivariate data mapping is to collect the cable operation status parameters and channel environmental parameters. The sensor values ​​of the cable (cable) body and channel can be collected in real time through the sensors arranged in the transmission corridor. These parameters include the load current of each phase of the cable, cable temperature, grounding current, voltage level, channel water level, gas, etc. The water level and gas in the channel can be displayed in real time by establishing a three-dimensional dynamic effect; the cable status and other information can be displayed dynamically by clicking on the corresponding three-dimensional model; the physical parameters of the cable body can be obtained through the transmission corridor cable attribute database constructed in the cable data manual. The above information is integrated into the three-dimensional geometric model of the transmission corridor to obtain a three-dimensional digital model of the transmission corridor, and three-dimensional model data sharing and collaborative operation are realized. Panoramic browsing and user interface development uses three-dimensional data visualization tools to display the established three-dimensional scene data, and through the development of three-dimensional roaming interactive functions, it supports multi-angle viewing of the three-dimensional structure of the cable body and the transmission corridor.

[0102] For the deduction of sheath circulation, Figure 6 As shown in the figure, the sheath circulation of multi-circuit cables is deduced and calculated based on the constructed digital twin model of the transmission corridor. The digital twin model of the transmission corridor is constructed based on the information of the constructed three-dimensional model of the corridor and the corridor database. The information of the corridor database includes the data and environmental parameters of the transmission corridor. Among them, the information of the corridor database includes the water level, gas, temperature and real-time load, geometric properties, line load, etc. of the cable in the corridor. Environmental parameters include soil resistivity and earth equivalent loop depth, etc. In order to realize the deduction and calculation of the sheath circulation, according to the digital twin model of the transmission corridor, the line facility parameters of the multi-circuit cables are first obtained, and the multi-circuit cable parallel segmentation model is constructed based on the above line facility parameters and the actual laying of the cable in the tunnel (that is, the multi-circuit cable is segmented according to the connection position information). Based on the model, the sheath impedance matrix and the induced potential matrix of each circuit core on the sheath are established respectively. By connecting the two, the sheath circulation simulation value can be solved and calculated immediately, and finally the simulation results are mapped to the three-dimensional digital visualization platform to realize the real-time display of the sheath circulation simulation deduction.

[0103] The following is a further introduction to the deduction and calculation of sheath circulation. First, based on the established digital twin model, the key parameters required for sheath circulation calculation (i.e., line facility parameters) are automatically obtained. The above-mentioned line facility parameters include: cable geometry information, such as the number of cable loops, the number of cross-connected segments, the length of each segment, the cable arrangement method, the distance, etc.; cable physical information, such as sheath resistivity, sheath inner and outer diameters, etc.; electrical information, such as operating frequency, load current, grounding resistance, etc. For cable geometry information, the original point cloud can be preliminarily clustered by the point cloud clustering algorithm, and then the cylindrical fitting algorithm is used to extract the spatial position information of the transmission cable and the geometric information of the cable body to realize the automatic extraction of parameters. For cable physical information, real-time acquisition can be achieved by establishing a cable attribute database access interface. For electrical information, real-time acquisition can be achieved by establishing a sensor dynamic reading interface.

[0104] Based on the above line facility parameters, a sheath circulation model with multiple circuits cross-connected and dislocated is established. For general urban cables, the cable length is short and the capacitive current can be ignored, so the inductive circulation is mainly considered. Since the length of multiple high-voltage cables laid in the tunnel is constrained by various conditions and the terminal positions of GIS (Gas Insulated Switchgear) may be different, Figure 2 The two parallel cables shown in the figure are used as an example to illustrate the method of solving the sheath circulation current by staggered segmentation. Figure 2 As shown, are the three-phase load currents of the first cable, They are the three-phase load currents of the second cable respectively; They are the three-phase sheath circulating current of the first cable, are the three-phase sheath circulating current of the second cable; R e is the earth loop equivalent resistance, R dr (r=1, 2, 3, 4) is the grounding resistance; J1, J2, J3, J4 are the cross-connection joints of the two cables respectively.

[0105] In order to analyze the influence of cross-connection misalignment on sheath circulation, Figure 2 The two-circuit cables are virtually segmented using the cross-connection joints of each line and the grounding boxes on both sides as segmentation points (i.e., the connection position information of the cable). Figure 3 The virtual cable segmentation diagram is shown in Figure 1. Figure 3 As shown in the figure, the two-circuit cable model is divided into 7 sections, among which J1, J2, J3, and J4 are cross-connectors. Due to the cross-connection misalignment, the two-circuit cables of sections D1 and D7 are not parallel, that is, there is no overlap between the two-circuit cables, which belongs to the first type of segmentation. The self-inductance of the first phase sheath of the first-circuit cable is as follows: Figure 4As shown. D2 section belongs to the second type of segmentation because there is overlap between the two cables and the phase sequence of the two cables has not changed; D3, D4, D5, D6 sections belong to the third type of segmentation because there is overlap between the two cables and there are cables with changed phase sequence. For D2, D3, D4, D5, D6 sections, the self-inductance and mutual inductance of the first phase sheath of the first cable are as follows: Figure 5 shown.

[0106] Matrix of sheath induced potential generated by the core on the sheath Can

[0107] It is expressed as:

[0108]

[0109] in, is the matrix of sheath impedance, is the grounding integrated impedance, for

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

[0111] According to different segments, the matrix of sheath impedance can be Divided into 7 parts, The formula is:

[0112]

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

[0114] D a Segment sheath impedance matrix It can be expressed as:

[0115]

[0116]

[0117] in, They are all 3×3 matrices, representing the mutual inductance between the two cables under the initial phase sequence state. The superscript 0 indicates that the number of matrix translation changes is 0 times (that is, the number of phase sequence changes is 0 times); L a For D a The length of the segment, in m (meters); X ii (i=1, 2, 3) represents the self-inductance of the cable, in units of (Ω / m) (ohm / meter), X ij(i=1, 2, 3; j=4, 5, 6) represents the mutual inductance between the two cables, and the unit is (Ω / m) (ohm / meter), where 1, 2, 3 are the ABC three-phases of the first cable, and 4, 5, 6 are the ABC three-phases of the second cable; D e Indicates the depth of the earth's equivalent loop, in meters; s ij represents the center distance between the i-th phase cable and the j-th phase cable, in meters; ρ g represents the earth resistivity, in Ω·m (ohm·meter); f represents the line operating frequency, in Hz (Hertz); r i,GMR It represents the geometric mean radius of the cable sheath of phase i, in m; d s1i Indicates the inner diameter of the cable sheath of phase i, in m (meter); d s2i Represents the outer diameter of the cable sheath of the i-th phase, in meters.

[0118] Among them, the two-circuit cable D1 section does not overlap, which belongs to the first type of segmentation; the two-circuit cables start to run in parallel (i.e. overlap) from section D2, but the phase sequence does not change, which belongs to the second type of segmentation, so:

[0119]

[0120] The D3 segment overlaps, and the first circuit is cross-connected at J1, and the phase of the cable metal sheath changes (that is, the phase sequence changes), which belongs to the third type of segmentation. 11 、z 12 、z 21 are all affected by cross-connection, which is calculated Need to be separately 11 、z 12 、z 21 Move up one row and forward one column, with z 11 For example, after the phase sequence changes It can be expressed as:

[0121]

[0122] Similarly, the second cable of D4 is cross-connected at J3. Affected by the cross-connection, 22 、z 12 、z 21 Perform the same translation transformation as above. And obtain For the D7 section, there is no parallel section between the two cables, which belongs to the first type of segmentation. Therefore:

[0123]

[0124] for Figure 2The two cables shown in the figure are divided into the following types according to their connection position information: Figure 3 The 7 segments shown. According to the different segments, the matrix of the sheath induced potential can be point

[0125] For 7 parts, The formula is:

[0126]

[0127] According to the influence of electromagnetic induction, for D a Sheath induced potential matrix The formula is:

[0128]

[0129] in, They are all 3×3 matrices, which respectively represent the sheath induced potential under the initial phase sequence state between the two cables. The superscript 0 means that the number of matrix translation changes is 0 times (that is, the number of phase sequence changes is 0 times); It represents the current matrix of two-circuit cable core wires, 1 and 2 represent the number of cables, and A, B, and C represent the three phases of the cable respectively.

[0130] The D1 sections of the two cables do not overlap, which belongs to the first type of segmentation. From the D2 section, there is overlap, but the phase sequence does not change, which belongs to the second type of segmentation. Therefore, there is:

[0131]

[0132]

[0133] The two cable D3 segments overlap, and the first line crosses and interconnects at J1, and the phase sequence of the cable metal sheath changes, which belongs to the third type of segmentation. 11 、e 12 、e 21 are all affected by cross-connection, which is calculated e 11 、e 12 、e 21 Move up one line, with e 11 For example, after the phase sequence changes It can be expressed as:

[0134]

[0135] Similarly, the second cable of D4 is cross-connected at J3. Affected by the cross-connection, 22 、e 12 、e 21Perform the same translation transformation as above. And obtain For the D7 section, there is no parallel section between the two cables, which belongs to the first type of segmentation. Therefore:

[0136]

[0137] According to the above matrix of sheath induced potential and sheath impedance matrix The sheath circulating current matrix of the two cables can be obtained

[0138] Alternatively, if the sheath circulation of n cables is calculated, the cable segment D can be constructed according to the actual cross-connection segmentation of the cables (i.e., the connection location information). a , and Expanded to a 3n-order matrix, Expanded to a 3n-dimensional vector, and then calculated separately Solving the problem by parallel equations

[0139] The sheath circulation determination method can be applied to a software application, in which a power transmission corridor in a certain region is taken as an example. Figure 7 is a first cable structure diagram of an optional sheath circulation determination method provided in an embodiment of the present application, such as Figure 7 As shown, two cables, Line 1 (the first cable) and Line 2 (the second cable), are laid in the corridor. Line 1 connects substation A and substation C, and is laid in a small T-shaped pattern; Line 2 connects substation B and substation C, and is laid in a large T-shaped pattern. Figure 8 is a second cable structure diagram of an optional sheath circulation determination method provided in an embodiment of the present application, such as Figure 8 As shown, two cables are laid in parallel, and the cable runs as follows Figure 8 As shown. The height of the two cable supports is 450mm (millimeter). The phase spacing of the small-pin-shaped cable of line 1 is 146mm, and the cable model is ZR-YJLW02-127 / 220KV-1×1000mm 2 The cable spacing on the same layer of the second line is 350mm, the vertical cable spacing is 450mm, and the cable model is ZR-YJLW02-127 / 220KV-1×1600mm 2 The cross-connection distances of Line 1 are 467m, 451m, and 474m respectively; the cross-connection distances of Line 2 are 458m, 458m, and 460m respectively.

[0140] A three-dimensional digital model of the transmission corridor is established. A three-dimensional laser scanner is used to set up a measuring station to collect point cloud data through ground station installation. The existing drawings, equipment information and other materials of each equipment in the corridor are integrated to form a comprehensive texture data source. Based on the collected spatial data and texture data, a three-dimensional geometric model of the cable corridor is constructed using three-dimensional modeling software. Texture mapping and lighting rendering are performed on the model to obtain a three-dimensional digital model of the transmission corridor. Fig. 9 This is a cable parameter diagram of an optional sheath circulation determination method provided in an embodiment of the present application, and is a cable attribute parameter visualization operation interface, which includes cable type, operating frequency, operating current, starting position, cable horizontal distance, cable vertical distance, cable three-phase metal sheath inner diameter, metal sheath outer diameter and cable resistance information. Fig. 9 The cable property parameters shown and the cable voltage level, load current, ambient temperature and other parameters are integrated into the digital model, which can realize 3D model data sharing and collaborative work.

[0141] The core wire current at a certain moment is selected for analysis. At this moment, the effective value of the core wire current of Line 1 and Line 2 is 400A (ampere), and the grounding impedance of the two cables is 0.5Ω (ohm). The simulated values ​​of the sheath circulating current of Line 1 and Line 2 are 32.14A and 30.76A respectively. Fig.10 is a first cable diagram of an optional sheath circulation determination method provided in an embodiment of the present application, such as Fig.10 As shown, the sheath circulating currents of the three phases A, B, and C of line 1 are all 32.1408A. Fig.11 is a second cable diagram of an optional sheath circulation determination method provided in an embodiment of the present application, such as Fig.11 As shown, the A, B, and C three-phase sheath circulating currents of line 2 are all 30.7664A. The above data are for illustration only and are not specifically limited.

[0142] The above optional implementation method achieves at least the following effects: according to the connection position information corresponding to the multiple cables, the cross-connected and misplaced cables are divided into sections with different electrical characteristics, and then the sheath circulation of each section is analyzed and calculated more finely; by constructing a three-dimensional model of the transmission corridor and combining the digital twin technology to build a three-dimensional digital cable sheath current measurement and visualization platform, the analysis and maintenance of the electrical system can be realized.

[0143] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0144] In this embodiment, a sheath annular current determination device is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made are not repeated here. As used below, the terms "module" and "device" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0145] According to an embodiment of the present application, a device embodiment for implementing a method for determining a sheath circulation is also provided. Fig.12 is a schematic diagram of a sheath circulation determination device according to an embodiment of the present application, such as Fig.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 is described below.

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

[0147] A segmentation result determination module 1204, connected to the connection position determination module 1202, is used to determine the segmentation results corresponding to the multiple cables respectively based on the connection position information;

[0148] The sheath circulating current determining module 1206 is connected to the segmentation result determining module 1204, and is used to determine the sheath circulating currents corresponding to the multiple cables respectively according to the segmentation results corresponding to the multiple cables respectively.

[0149] In a sheath circulation determination device provided by an embodiment of the present application, a connection position determination module 1202 is set to obtain connection position information corresponding to multiple cables, wherein the connection position information indicates that the starting and ending positions of different 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 results corresponding to 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 circulation corresponding to the multiple cables according to the segmentation results corresponding to the multiple cables. The purpose of dividing the multiple cables into sections with different electrical characteristics according to the cross-connection joints of the multiple cables with cross-connection dislocation and the starting and ending positions of each cable is achieved, and the sheath impedance and sheath induced potential of the multiple cables are determined based on the different electrical characteristics, and the technical effect of improving the accuracy of the sheath circulation calculation results for the multiple cables with cross-connection dislocation is achieved, thereby solving the technical problem that the accuracy of the sheath circulation calculation results for the multiple cables with cross-connection dislocation is not ideal.

[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, the segmentation result determination module 1204, and the sheath circulation determination module 1206 correspond to steps S102 to S106 in the embodiment, and the examples and application scenarios implemented by the modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the modules as part of the device can be run in a computer terminal.

[0152] It should be noted that the optional or preferred implementation of this embodiment can refer to the relevant description in the embodiment, which will not be repeated here.

[0153] The above-mentioned sheath circulation determination device may also 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 above-mentioned program units stored in the memory to realize the corresponding functions.

[0154] The processor includes a kernel, which retrieves the corresponding program unit from the memory. There can be one or more kernels. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one storage chip.

[0155] An embodiment of the present application provides a non-volatile storage medium on which a program is stored. When the program is executed by a processor, a method for determining a sheath circulation current is implemented.

[0156] The embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program stored in the memory and can be run on the processor. When the processor executes the program, the following steps are implemented: obtaining connection position information corresponding to multiple cables, wherein the connection position information indicates that the starting and ending points of different cables in the multiple cables are different; based on the connection position information, determining the segmentation results corresponding to the multiple cables; and determining the sheath circulation currents corresponding to the multiple cables according to the segmentation results corresponding to the multiple cables. The device in this article can be a server, a PC, etc.

[0157] The present 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 multiple cables, wherein the connection position information indicates that the starting and ending points corresponding to different cables in the multiple cables are different; based on the connection position information, determining the segmentation results corresponding to the multiple cables; and according to the segmentation results corresponding to the multiple cables, determining the sheath circulation currents corresponding to the multiple cables.

[0158] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0159] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0160] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0161] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions 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] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0164] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules 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 technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0165] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0166] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0167] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for determining sheath circulation, characterized in that: include: Acquire connection position information corresponding to the multiple cables, wherein the connection position information indicates that the starting and ending points of different cables in the multiple cables are different; Based on the connection position information, determining the segmentation results respectively corresponding to the multiple cables; According to the segmentation results respectively corresponding to the multiple cables, the sheath circulation currents respectively corresponding to the multiple cables are determined.

2. The method according to claim 1, characterized in that: The connection position information includes the cross-connection joint positions of the corresponding number of cables in the multiple cables, and the cross-connection joint positions are positions where the corresponding number of cables perform phase switching operations. The determining of the segmentation results corresponding to the multiple cables respectively based on the connection position information includes: Based on the cross-connection joint positions and the starting and ending point positions respectively corresponding to the multiple cables, the multiple cables are segmented to obtain multiple sections corresponding to each cable included in the multiple cables; based on the multiple sections corresponding to each cable, the segmentation results corresponding to the multiple cables are determined.

3. The method according to claim 1, characterized in that Determining the sheath circulation currents corresponding to the multiple cables respectively according to the segmentation results corresponding to the multiple cables respectively includes: Determining the overlapping information of sections between the multiple cables based on the segmentation results respectively corresponding to the multiple cables; According to the segment overlap information, determining electrical characteristics corresponding to the multiple segments in each cable; Based on the electrical characteristics respectively corresponding to the multiple sections in each cable, the sheath circulating currents respectively corresponding to the multiple cables are determined.

4. The method according to claim 3, characterized in that Determining electrical characteristics corresponding to the multiple sections in each cable according to the section overlap information includes: According to the segment overlap information, determining in the plurality of segments the first type of segments where each cable loop does not overlap with other cables loops; For the first-type segments in the multiple sections, the cable self-inductance of the first-type segments is determined based on the line facility parameters of each cable loop as the electrical characteristics corresponding to the first-type segments.

5. The method according to claim 3, characterized in that: Determining electrical characteristics corresponding to the multiple sections in each cable according to the section overlap information includes: According to the segment overlap information, determining in the multiple segments that each cable loop overlaps with other cables loops, and each cable loop maintains a first initial phase sequence, and the other cables loops maintain a second type of segmentation in which the first initial phase sequence is maintained; For the second type of segments in the multiple sections, 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 segments are determined as the electrical characteristics corresponding to the second type of segments.

6. The method according to claim 3, characterized in that Determining electrical characteristics corresponding to the multiple sections in each cable according to the section overlap information includes: According to the segment overlap information, determining in the multiple segments that each cable loop overlaps with other cables loops, and that each cable loop and any of the other cables loops have a third type of segmentation in which a phase sequence change occurs; For the third type of segments in the multiple sections, 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 segments are determined as the electrical characteristics corresponding to the third type of segments.

7. The method according to any one of claims 1 to 6, characterized in that: Determining the sheath circulation currents corresponding to the multiple cables respectively according to the segmentation results corresponding to the multiple cables respectively includes: Determine the sheath impedance information and sheath induced potential information corresponding to the multiple cables respectively according to the segmentation results corresponding to the multiple cables respectively; Based on the sheath impedance information and sheath induced potential information respectively corresponding to the multiple cables, the sheath circulating currents respectively corresponding to the multiple cables are determined.

8. A sheath circulation determination device, characterized in that: include: A connection position determination module, used to obtain connection position information corresponding to the multiple cables, wherein the connection position information indicates that the starting and ending points of different cables in the multiple cables are different; A segmentation result determination module, used to determine the segmentation results respectively corresponding to the multiple cables based on the connection position information; The sheath circulation determination module is used to determine the sheath circulations corresponding to the multiple cables respectively according to the segmentation results corresponding to the multiple cables respectively.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the sheath circulating current 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, wherein the memory is 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 implement the sheath annular current determination method described in any one of claims 1 to 7.

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