CN117810861A - Method and device for determining cable laying mode - Google Patents
Method and device for determining cable laying mode Download PDFInfo
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Abstract
The application discloses a method and a device for determining a cable laying mode. Wherein the method comprises the following steps: acquiring structural information of a target cable tunnel, and acquiring first information of laid cables and second information of cables to be laid in the target cable tunnel; determining a plurality of cable laying modes according to the structural information, the first information and the second information, wherein the cable laying modes comprise: the arrangement mode of the laid cable and the cable to be laid; determining expected heating power of the cable sheath current generated by each cable laying mode under the target load level; and determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode. The technical problem that unreasonable cable laying mode in the related art easily causes large cable sheath current and affects stable operation of the cable is solved.
Description
Technical Field
The application relates to the technical field of electrical engineering, in particular to a method and a device for determining a cable laying mode.
Background
The tunnel cabling is used as a common cable laying mode in cities, and has the characteristics of saving ground surface space and running safety. With the gradual increase of urban construction, urban electricity load is gradually increased, and the number of parallel cables existing in the same tunnel is gradually increased to adapt to the gradually increased electricity load. Because of the electromagnetic induction between the two parallel circuits in the tunnel, the induced electromotive force can be generated on the metal sheath of the high-voltage cable, and then the sheath flows back, and when the sheath flows back greatly, the cable can generate heat, so that the safe and stable operation of the cable is endangered.
At present, in the installation and the laying of tunnel cables, no detailed rule standard exists on the arrangement mode of the cables on the cable brackets and the specific positions of the cables arranged on the cable brackets, and usually, all electric power companies are arranged according to the arrangement convenience or the sequence of the cable brackets, and the influence of the arrangement positions and the phase sequences of the cables on the electromagnetic environment around the cables and the influence of the arrangement positions and the phase sequences on the current of the cable sheaths are not considered. Meanwhile, there is no relevant standard for setting the grounding resistance at the grounding positions of the two ends of the cross interconnection and whether the resistance is assumed in the protection layer loop. Without prior analysis of the cable discharge location, it may result in increased sheath current and safety issues.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining a cable laying mode, which are used for at least solving the technical problems that an unreasonable cable laying mode in the related technology is easy to cause larger cable sheath current and influence stable operation of a cable.
According to an aspect of an embodiment of the present application, there is provided a method for determining a cabling method, including: acquiring structural information of a target cable tunnel, and acquiring first information of laid cables and second information of cables to be laid in the target cable tunnel; determining a plurality of cable laying modes according to the structural information, the first information and the second information, wherein the cable laying modes comprise: the arrangement mode of the laid cable and the cable to be laid; determining expected heating power of the cable sheath current generated by each cable laying mode under the target load level; and determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
Optionally, obtaining structural information of the target cable tunnel, and obtaining first information of the laid cable and second information of the to-be-laid cable in the target cable tunnel, including: obtaining structure information of a target cable tunnel, wherein the structure information at least comprises: the cross-sectional size of the target cable tunnel, the number of layers of cable brackets in the target cable tunnel and the positions of the brackets at each layer; obtaining first information of the laid cable, wherein the first information at least comprises: the number of laid cables and the number of support layers where each laid cable is located; obtaining second information of the cable to be laid, wherein the second information at least comprises: the number of cables to be laid.
Optionally, determining a plurality of cabling manners according to the structural information, the first information and the second information includes: if the laid cables exist in the target cable tunnel, carrying out random arrangement and combination on the cables to be laid on an idle bracket in the target cable tunnel to obtain all cable laying modes; and if no laid cable exists in the target cable tunnel, carrying out random arrangement and combination on the cables to be laid on all the supports in the target cable tunnel to obtain all the cable laying modes.
Optionally, determining the sheath current and the desired heating power of the sheath current generated by each cabling style at the target load level comprises: for each cable laying mode, determining the cross interconnection length of cables in the cable laying mode, cable core current at a target load level, soil resistivity, grounding resistance and cable sheath resistance; determining cable sheath current generated by a cable laying mode according to the cross interconnection length, the cable core current, the soil resistivity, the grounding resistance and the cable sheath resistance; the desired heating power is determined from the sheath current.
Optionally, determining the cable sheath current generated by the cable laying mode according to the cross-interconnection length, the cable core current, the soil resistivity, the ground resistance and the cable sheath resistance includes: determining the equivalent depth of the ground loop according to the soil resistivity, and determining the mutual inductance resistance between every two cables in unit length according to the equivalent depth of the ground loop; establishing a first inductance matrix of the cable core current for the cable sheath according to the mutual inductance and the cross interconnection length, and determining the induced electromotive force of the cable core current for the cable sheath according to the cable core current and the first inductance matrix; establishing a second inductance matrix of the cable sheath current for the cable sheath according to the mutual inductance and the cross interconnection length, establishing a cable sheath impedance matrix according to the mutual inductance, the cross interconnection length and the cable sheath resistance, and determining the total impedance of a cable sheath current loop according to the cable sheath impedance matrix, the grounding resistance and the second inductance matrix; and determining the cable sheath current according to the total impedance and the induced electromotive force.
Optionally, determining the target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode includes: determining a first cable laying mode of which the cable sheath current is smaller than a preset current threshold value from a plurality of cable laying modes; if only a unique first cable laying mode exists, determining that the first cable laying mode is a target cable laying mode; if multiple first cable laying modes exist, determining the first cable laying mode with the minimum required heating power of the multiple first cable laying modes as a target cable laying mode.
Optionally, if the first cable laying mode does not exist, determining a second cable laying mode with the minimum expected heating power from multiple cable laying modes, and connecting a resistor or an inductor with a preset size in series in the laid cable corresponding to the second cable laying mode and the protective layer of the cable to be laid, so as to obtain the target cable laying mode.
According to another aspect of the embodiments of the present application, there is also provided a device for determining a cabling method, including: the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring structural information of a target cable tunnel and acquiring first information of a laid cable and second information of a to-be-laid cable in the target cable tunnel; the first determining module is used for determining a plurality of cable laying modes according to the structural information, the first information and the second information, wherein the cable laying modes comprise: the arrangement mode of the laid cable and the cable to be laid; the second determining module is used for determining the cable sheath current and the expected heating power of the cable sheath current, which are generated by each cable laying mode at the target load level; and the third determining module is used for determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
According to another aspect of the embodiments of the present application, there is further provided a nonvolatile storage medium, where the nonvolatile storage medium includes a stored computer program, and a device where the nonvolatile storage medium is located executes the above-mentioned method for determining the cable laying manner by running the computer program.
According to another aspect of the embodiments of the present application, there is also provided an electronic device including: the system comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the method for determining the cable laying mode through the computer program.
In the embodiment of the application, the electromagnetic induction calculation model of the cable in the cable tunnel is built by collecting the information such as the cable support structure in the cable tunnel, the information related to the built cable to be built, the load operation level, the cable segmentation length and the like, and the cable can be laid in combination with the actual situation in the cable tunnel; meanwhile, through the electromagnetic induction principle between cables, the sheath current of the cables when construction is completed is analyzed and calculated, then the sheath current level under the condition of all possible cable arrangement modes is analyzed and calculated according to the arrangement mode of the cable support, the sheath current level is combined with the series sheath impedance mode, expected heating power is comprehensively considered, an optimal arrangement mode is obtained, theoretical guidance can be provided for arrangement between a cable line to be constructed and the cables, generation of sheath induction current is inhibited at the source of urban high-voltage cable structural arrangement, the effect of ensuring safe and stable operation of the cables is achieved, and the technical problems that the cable sheath current is large and stable operation is influenced due to unreasonable cable arrangement modes in the related technology are effectively solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic diagram of an alternative computer terminal according to an embodiment of the present application;
FIG. 2 is a flow chart of an alternative cabling scheme determination method according to an embodiment of the present application;
FIG. 3 is a schematic illustration of an alternative dual-loop cable arrangement possible in accordance with an embodiment of the present application;
fig. 4 is a schematic structural diagram of an alternative cabling scheme determining device according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In order to plan the arrangement of the cable lines to be built and the cables in the built cable lines, and solve the problem that the cable sheath current is large and the stable operation of the cable is affected due to the unreasonable cable laying manner, the embodiment of the present application provides a method for determining the cable laying manner, it should be noted that the steps shown in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and although a logic sequence is shown in the flowchart, in some cases, the steps shown or described may be executed in a sequence different from that herein.
The method embodiments provided by the embodiments of the present application may be performed in a mobile terminal, a computer terminal, or similar computing device. Fig. 1 shows a block diagram of the hardware architecture of a computer terminal (or mobile device) for implementing a method of determining a cabling scheme. As shown in fig. 1, the computer terminal 10 (or mobile device 10) may include one or more (shown as 102a, 102b, … …,102 n) processors 102 (the processors 102 may include, but are not limited to, a microprocessor MCU, a programmable logic device FPGA, etc. processing means), a memory 104 for storing data, and a transmission means 106 for communication functions. In addition, the method may further include: a display, an input/output interface (I/O interface), a Universal Serial BUS (USB) port (which may be included as one of the ports of the BUS), a network interface, a power supply, and/or a camera. It will be appreciated by those of ordinary skill in the art that the configuration shown in fig. 1 is merely illustrative and is not intended to limit the configuration of the electronic device described above. For example, the computer terminal 10 may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.
It should be noted that the one or more processors 102 and/or other data processing circuits described above may be referred to generally herein as "data processing circuits. The data processing circuit may be embodied in whole or in part in software, hardware, firmware, or any other combination. Furthermore, the data processing circuitry may be a single stand-alone processing module, or incorporated, in whole or in part, into any of the other elements in the computer terminal 10 (or mobile device). As referred to in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of the path of the variable resistor termination to interface).
The memory 104 may be used to store software programs and modules of application software, such as program instructions/data storage devices corresponding to the method for determining a cabling scheme in the embodiment of the present application, and the processor 102 executes the software programs and modules stored in the memory 104, thereby executing various functional applications and data processing, that is, implementing the method for detecting vulnerabilities of application programs. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission means 106 is arranged to receive or transmit data via a network. The specific examples of the network described above may include a wireless network provided by a communication provider of the computer terminal 10. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module for communicating with the internet wirelessly.
The display may be, for example, a touch screen type Liquid Crystal Display (LCD) that may enable a user to interact with a user interface of the computer terminal 10 (or mobile device).
In the above operating environment, the embodiment of the present application provides a method for determining a cable laying manner, as shown in fig. 2, including the following steps:
step S202, obtaining structural information of a target cable tunnel, and obtaining first information of laid cables and second information of cables to be laid in the target cable tunnel;
step S204, determining a plurality of cable laying modes according to the structural information, the first information and the second information, wherein the cable laying modes comprise: the arrangement mode of the laid cable and the cable to be laid;
Step S206, determining the cable sheath current and the expected heating power of the cable sheath current generated by each cable laying mode under the target load level;
step S208, determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
The steps of the method for determining the cabling scheme will be described below with reference to specific embodiments.
As an optional implementation manner, obtaining structural information of the target cable tunnel, where the structural information at least includes: the cross-sectional size of the target cable tunnel, the number of layers of cable brackets in the target cable tunnel and the positions of the brackets at each layer; obtaining first information of the laid cable, wherein the first information at least comprises: the number of laid cables and the number of support layers where each laid cable is located; obtaining second information of the cable to be laid, wherein the second information at least comprises: the number of cables to be laid.
Then, determining a plurality of cable laying modes according to the structural information, the first information and the second information can be performed in the following modes: if the laid cables exist in the target cable tunnel, carrying out random arrangement and combination on the cables to be laid on an idle bracket in the target cable tunnel to obtain all cable laying modes; and if no laid cable exists in the target cable tunnel, carrying out random arrangement and combination on the cables to be laid on all the supports in the target cable tunnel to obtain all the cable laying modes. Fig. 3 shows a possible arrangement of cables in a spatial position distribution of the double loop cable.
The cables to be laid are arranged in a random arrangement mode, so that the current of the cable protecting layer is possibly too large, the safe operation of the cables cannot be guaranteed, and then safety accidents occur, so that the optimal arrangement mode of the cables to be laid needs to be calculated and determined according to the acquired related information. In the embodiment of the application, taking spatial position distribution under the double-loop arrangement of the cables as an example, the cable sheath current and the expected heating power corresponding to each cable laying mode under the double-loop arrangement are calculated.
Alternatively, determining the sheath current and the desired heating power of the sheath current generated by each cabling scheme at the target load level may be performed by: for each cabling scheme, determining the cross-connect length l of the cables in the cabling scheme m Cable core current I at target load level n Soil resistivity ρ, ground resistance R d Resistance of cable sheathAccording to the cross-connection length l m Cable core current I n Soil resistivity ρ, ground resistance R d And cable sheath resistance->Determining the cable sheath current I generated by the cable laying mode S The method comprises the steps of carrying out a first treatment on the surface of the According to the current I of the cable protection layer S Determining the desired heating power +. >
Wherein I is n Represents a cable core current value numbered n, n=1, 2, 3; i m Represents the length of the cable numbered m segments, m=1, 2,3,sheath resistance R of cable with number k S ，k＝1，2，...，n。
Specifically, the mutual inductance resistance X between every two cables per unit length can be determined by ij : determining the equivalent depth D of the ground loop according to the soil resistivity rho and the core current frequency f e . The specific calculation formula is as follows:
the mutual inductance resistance X between every two cables per unit length can be determined by ij : according to the equivalent depth D of the ground loop e Determination of mutual inductance resistance X between every two cables per unit length ij . The specific calculation formula is as follows:
wherein S is ij Represents the centre distance between the cable numbers i and j, X ij Representing the mutual inductance resistance between two cables per unit length of cable numbers i and j.
The first inductive reactance matrix B of the cable core current for the cable sheath can be determined by: according to mutual inductance X ij And cross-connect length l m A first inductive reactance matrix B of the cable core current for the cable sheath is established. The specific calculation formula is as follows:
in the method, in the process of the invention,represents the T th 2 Loop cable sheath pair T 1 Inductance matrix T generated by loop core current 1 And T 2 The values of (2) are 1-n, and +.>The specific calculation formula of (2) is as follows:
wherein t is 1 ＝1+3(T 1 -1)，t 2 ＝1+3(T 2 -1)。
The induced electromotive force E of the cable core current to the cable sheath can be determined in accordance with the cable core current I by S And the first inductive reactance matrix B determines the induced electromotive force E of the cable core current to the cable sheath. The specific formula is as follows:
wherein I is a cable core current matrix,is the cable core current value with the number of 1 to n.
The second inductive reactance matrix D of the sheath current for the sheath can be determined by: according to mutual inductance X ij And cross-connect length l m And establishing a second inductive reactance matrix D of the cable sheath current for the cable sheath. The specific formula is as follows:
in the method, in the process of the invention,represents the T th 2 Loop cable sheath pair T 1 Inductance matrix generated by loop cable sheath currentThe specific calculation formula of (2) is as follows:
wherein when T 1 ＝T 2 In the time-course of which the first and second contact surfaces,the main diagonal elements are all zero.
The cable sheath impedance matrix Z may be constructed as follows: according to mutual inductance X ij Length of cross-connect l m And cable sheath resistanceAnd constructing a cable sheath impedance matrix Z. The specific calculation formula is as follows:
wherein Z is 1 ～Z n Is the sheath impedance of the cable numbered 1-n, Z n Specifically, the method can be calculated by the following formula:
then, according to the impedance matrix Z of the cable sheath and the grounding resistor R d And the second inductive reactance matrix D determines the total impedance ZZ of the sheath current loop. The specific formula of the total impedance ZZ of the cable sheath current loop is as follows:
ZZ＝Z+R d[n×n] +jD
wherein R is d[n×n] Represents a ground resistance matrix, R d[n×n] Is the element values are all R d N-th order square matrix of (c).
Then, determining the cable sheath current I according to the total impedance ZZ and the induced electromotive force E S . Cable sheath current I S The specific calculation formula of (2) is as follows:
I S ＝ZZ -1 E
wherein I is S The specific calculation formula of the current column matrix for the cable sheath is as follows:
wherein,is the current value of the cable sheath with the number of 1 to n.
Wherein, can be based on the cable sheath current I S And cable sheath impedance matrix Z to determine desired heating powerThe specific calculation formula is as follows:
it should be noted that, the standard model of the calculation process can be established in matlab, and then the standard model can be directly called when the cable sheath current and the expected heating power of the cable to be laid need to be calculated, and the calculation result can be obtained only by inputting the relevant parameters.
The distances between the cable loops are different in different arrangement modes, so that the calculated sheath current levels are different, and meanwhile, the sheath currents in the same arrangement mode are also different due to different core wire load levels, so that different cable laying modes are required to be set according to different arrangement modes and different load levels.
Specifically, according to the cable sheath current and the expected heating power corresponding to each cable laying mode, the target cable laying mode is determined from a plurality of cable laying modes, and the method can be performed as follows: determining a first cable laying mode of which the cable sheath current is smaller than a preset current threshold value from a plurality of cable laying modes; if only a unique first cable laying mode exists, determining that the first cable laying mode is a target cable laying mode; if multiple first cable laying modes exist, determining the first cable laying mode with the minimum required heating power of the multiple first cable laying modes as a target cable laying mode.
If only one standard-compliant cabling mode exists in the multiple cabling modes, the mode is definitely an optimal arrangement mode, but in an actual application scene, the standard-compliant cabling mode may exist in multiple modes, the optimal cabling arrangement mode cannot be determined only by means of the cable sheath current, and calculation can be continuously carried out on expected heating power of the cable arrangement mode at the moment, so that the optimal cable arrangement mode is obtained. Accordingly, all the laying modes may not meet the standard, and the current of the cable sheath can return to the normal level, namely meet the standard, through the mode of connecting a resistor or an inductor in series in the sheath of the laid cable.
Optionally, if the first cable laying mode does not exist, determining a second cable laying mode with the minimum expected heating power from multiple cable laying modes, and connecting a resistor or an inductor with a preset size in series in the laid cable corresponding to the second cable laying mode and the protective layer of the cable to be laid, so as to obtain the target cable laying mode.
The size of the resistor and the inductor can be set according to actual needs, the cable is laid according to the mode, and the cable can be ensured to run safely while the overlarge current of the cable sheath is prevented, so that safety accidents are prevented.
In the embodiment of the application, the electromagnetic induction calculation model of the cable in the cable tunnel is built by collecting the information such as the cable support structure in the cable tunnel, the information related to the built cable to be built, the load operation level, the cable segmentation length and the like, and the cable can be laid in combination with the actual situation in the cable tunnel; meanwhile, through the electromagnetic induction principle between cables, the sheath current of the cables when construction is completed is analyzed and calculated, then the sheath current level under the condition of all possible cable arrangement modes is analyzed and calculated according to the arrangement mode of the cable support, the sheath current level is combined with the series sheath impedance mode, expected heating power is comprehensively considered, an optimal arrangement mode is obtained, theoretical guidance can be provided for arrangement between a cable line to be constructed and the cables, generation of sheath induction current is inhibited at the source of urban high-voltage cable structural arrangement, the effect of ensuring safe and stable operation of the cables is achieved, and the technical problems that the cable sheath current is large and stable operation is influenced due to unreasonable cable arrangement modes in the related technology are effectively solved.
Example 2
According to an embodiment of the present application, there is further provided a determining apparatus for determining a cabling scheme for implementing the determining method for a cabling scheme in embodiment 1, as shown in fig. 4, where the determining apparatus for a cabling scheme includes at least an obtaining module 41, a first determining module 42, a second determining module 43, and a third determining module 44, where:
an obtaining module 41, configured to obtain structural information of a target cable tunnel, and obtain first information of a laid cable in the target cable tunnel and second information of a cable to be laid;
the first determining module 42 is configured to determine a plurality of cabling manners according to the structural information, the first information, and the second information, where the cabling manners include: the arrangement mode of the laid cable and the cable to be laid;
a second determining module 43, configured to determine a sheath current and a desired heating power of the sheath current generated by each cabling method at a target load level;
the third determining module 44 is configured to determine a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
The functions of each module of the cable laying mode determining device will be specifically described below in connection with specific implementation procedures.
As an optional implementation manner, the acquiring module first acquires structural information of the target cable tunnel, where the structural information at least includes: the cross-sectional size of the target cable tunnel, the number of layers of cable brackets in the target cable tunnel and the positions of the brackets at each layer; and then obtaining first information of the laid cable, wherein the first information at least comprises the following components: the number of laid cables and the number of support layers where each laid cable is located; obtaining second information of the cable to be laid, wherein the second information at least comprises: the number of cables to be laid.
Then, when determining a plurality of cable laying modes according to the structural information, the first information and the second information, the first determining module can perform the following modes: if the laid cables exist in the target cable tunnel, carrying out random arrangement and combination on the cables to be laid on an idle bracket in the target cable tunnel to obtain all cable laying modes; and if no laid cable exists in the target cable tunnel, carrying out random arrangement and combination on the cables to be laid on all the supports in the target cable tunnel to obtain all the cable laying modes. Fig. 3 shows a possible arrangement of cables in a spatial position distribution of the double loop cable.
The cables to be laid are arranged in a random arrangement mode, so that the current of the cable protecting layer is possibly too large, the safe operation of the cables cannot be guaranteed, and then safety accidents occur, so that the optimal arrangement mode of the cables to be laid needs to be calculated and determined according to the acquired related information. In the embodiment of the application, taking spatial position distribution under the double-loop arrangement of the cables as an example, the cable sheath current and the expected heating power corresponding to each cable laying mode under the double-loop arrangement are calculated.
Optionally, the second determining module may determine the sheath current and the desired heating power of the sheath current generated by each cabling method at the target load level by: for each cable laying mode, determining cable core current, soil resistivity, grounding resistance and cable sheath resistance of the cables in the cable laying mode under the target load level of the cross interconnection length; determining cable sheath current generated by a cable laying mode according to the cross interconnection length, the cable core current, the soil resistivity, the grounding resistance and the cable sheath resistance; the desired heating power is determined from the sheath current.
Specifically, determining the cable sheath current generated by the cable laying mode according to the cross interconnection length, the cable core current, the soil resistivity, the grounding resistance and the cable sheath resistance can be performed in the following manner: determining the equivalent depth of the ground loop according to the soil resistivity, and determining the mutual inductance resistance between every two cables in unit length according to the equivalent depth of the ground loop; establishing a first inductance matrix of the cable core current for the cable sheath according to the mutual inductance and the cross interconnection length, and determining the induced electromotive force of the cable core current for the cable sheath according to the cable core current and the first inductance matrix; establishing a second inductance matrix of the cable sheath current for the cable sheath according to the mutual inductance and the cross interconnection length, establishing a cable sheath impedance matrix according to the mutual inductance, the cross interconnection length and the cable sheath resistance, and determining the total impedance of a cable sheath current loop according to the cable sheath impedance matrix, the grounding resistance and the second inductance matrix; and determining the cable sheath current according to the total impedance and the induced electromotive force.
It should be noted that, the standard model of the calculation process can be established in matlab, and then the standard model can be directly called when the cable sheath current and the expected heating power of the cable to be laid need to be calculated, and the calculation result can be obtained only by inputting the relevant parameters.
The distances between the cable loops are different in different arrangement modes, so that the calculated sheath current levels are different, and meanwhile, the sheath currents in the same arrangement mode are also different due to different core wire load levels, so that different cable laying modes are required to be set according to different arrangement modes and different load levels.
Specifically, when determining the target cable laying mode from the multiple cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode, the third determining module may perform the following steps: determining a first cable laying mode of which the cable sheath current is smaller than a preset current threshold value from a plurality of cable laying modes; if only a unique first cable laying mode exists, determining that the first cable laying mode is a target cable laying mode; if multiple first cable laying modes exist, determining the first cable laying mode with the minimum required heating power of the multiple first cable laying modes as a target cable laying mode.
If only one standard-compliant cabling mode exists in the multiple cabling modes, the mode is definitely an optimal arrangement mode, but in an actual application scene, the standard-compliant cabling mode may exist in multiple modes, the optimal cabling arrangement mode cannot be determined only by means of the cable sheath current, and calculation can be continuously carried out on expected heating power of the cable arrangement mode at the moment, so that the optimal cable arrangement mode is obtained. Accordingly, all the laying modes may not meet the standard, and the current of the cable sheath can return to the normal level, namely meet the standard, through the mode of connecting a resistor or an inductor in series in the sheath of the laid cable.
Optionally, if the first cable laying mode does not exist, determining a second cable laying mode with the minimum expected heating power from multiple cable laying modes, and connecting a resistor or an inductor with a preset size in series in the laid cable corresponding to the second cable laying mode and the protective layer of the cable to be laid, so as to obtain the target cable laying mode.
The size of the resistor and the inductor can be set according to actual needs, the cable is laid according to the mode, and the cable can be ensured to run safely while the overlarge current of the cable sheath is prevented, so that safety accidents are prevented.
It should be noted that, each module in the determining device for a cable laying manner in the embodiment of the present application corresponds to each implementation step of the determining method for a cable laying manner in embodiment 1 one by one, and since detailed description has already been made in embodiment 1, details that are not partially shown in this embodiment may refer to embodiment 1, and will not be described in detail here again.
Example 3
According to an embodiment of the present application, there is further provided a nonvolatile storage medium, where the nonvolatile storage medium includes a stored computer program, and a device where the nonvolatile storage medium is located executes the method for determining the cable laying manner in embodiment 1 by running the computer program.
Specifically, the device on which the nonvolatile storage medium resides performs the following steps by running the computer program: acquiring structural information of a target cable tunnel, and acquiring first information of laid cables and second information of cables to be laid in the target cable tunnel; determining a plurality of cable laying modes according to the structural information, the first information and the second information, wherein the cable laying modes comprise: the arrangement mode of the laid cable and the cable to be laid; determining expected heating power of the cable sheath current generated by each cable laying mode under the target load level; and determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
According to an embodiment of the present application, there is also provided a processor for running a computer program, where the computer program when running performs the method for determining the cabling method in embodiment 1.
Specifically, the computer program when run performs the steps of: acquiring structural information of a target cable tunnel, and acquiring first information of laid cables and second information of cables to be laid in the target cable tunnel; determining a plurality of cable laying modes according to the structural information, the first information and the second information, wherein the cable laying modes comprise: the arrangement mode of the laid cable and the cable to be laid; determining expected heating power of the cable sheath current generated by each cable laying mode under the target load level; and determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
According to an embodiment of the present application, there is also provided an electronic device including: a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the method of determining the cabling scheme in embodiment 1 by the computer program.
Specifically, the computer program when run performs the steps of: acquiring structural information of a target cable tunnel, and acquiring first information of laid cables and second information of cables to be laid in the target cable tunnel; determining a plurality of cable laying modes according to the structural information, the first information and the second information, wherein the cable laying modes comprise: the arrangement mode of the laid cable and the cable to be laid; determining expected heating power of the cable sheath current generated by each cable laying mode under the target load level; and determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
The foregoing embodiment numbers are merely for the purpose of description and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of units may be a logic function division, and there may be another division manner in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be comprehended within the scope of the present application.
Claims (10)
1. A method of determining a cabling scheme, comprising:
acquiring structural information of a target cable tunnel, and acquiring first information of laid cables and second information of cables to be laid in the target cable tunnel;
determining a plurality of cable laying modes according to the structural information, the first information and the second information, wherein the cable laying modes comprise: the arrangement mode of the laid cable and the cable to be laid;
determining expected heating power of the cable sheath current generated by each cable laying mode under the target load level;
and determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
2. The method of claim 1, wherein obtaining structural information of a target cable tunnel and obtaining first information of a laid cable and second information of a to-be-laid cable in the target cable tunnel comprises:
obtaining structure information of the target cable tunnel, wherein the structure information at least comprises: the cross-sectional size of the target cable tunnel, the number of layers of cable brackets in the target cable tunnel and the positions of each layer of brackets;
Obtaining first information of the laid cable, wherein the first information at least comprises: the number of the laid cables and the number of the bracket layers where each laid cable is positioned;
obtaining second information of the cable to be laid, wherein the second information at least comprises: the number of cables to be laid.
3. The method of claim 2, wherein determining a plurality of cabling schemes from the structural information, the first information, and the second information comprises:
if the laid cables exist in the target cable tunnel, randomly arranging and combining the cables to be laid on an idle bracket in the target cable tunnel to obtain all cable laying modes;
and if no laid cable exists in the target cable tunnel, carrying out random arrangement and combination on the cables to be laid on all the supports in the target cable tunnel to obtain all the cable laying modes.
4. The method of claim 1, wherein determining the sheath current and the desired heating power of the sheath current generated by each cabling style at the target load level comprises:
For each cable laying mode, determining the cross interconnection length of cables in the cable laying mode, the cable core current at the target load level, the soil resistivity, the grounding resistance and the cable sheath resistance;
determining cable sheath current generated by the cable laying mode according to the cross interconnection length, the cable core current, the soil resistivity, the grounding resistance and the cable sheath resistance;
and determining the expected heating power according to the cable sheath current.
5. The method of claim 4, wherein determining the sheath current generated by the cabling scheme as a function of the cross-connect length, the cable core current, the soil resistivity, the ground resistance, and the sheath resistance comprises:
determining the equivalent depth of a ground loop according to the soil resistivity, and determining the mutual inductance between every two cables in unit length according to the equivalent depth of the ground loop;
establishing a first inductance matrix of the cable core current for the cable sheath according to the mutual inductance and the cross interconnection length, and determining the induced electromotive force of the cable core current for the cable sheath according to the cable core current and the first inductance matrix;
Establishing a second inductance matrix of the cable sheath current to the cable sheath according to the mutual inductance and the cross interconnection length, establishing a cable sheath impedance matrix according to the mutual inductance, the cross interconnection length and the cable sheath resistance, and determining the total impedance of a cable sheath current loop according to the cable sheath impedance matrix, the grounding resistance and the second inductance matrix;
and determining the cable sheath current according to the total impedance and the induced electromotive force.
6. The method of claim 1, wherein determining a target cabling scheme from a plurality of cabling schemes based on the sheath current and the desired heating power for each cabling scheme comprises:
determining a first cable laying mode of which the cable sheath current is smaller than a preset current threshold value from a plurality of cable laying modes;
if only the first cable laying mode exists, determining that the first cable laying mode is the target cable laying mode;
and if the plurality of first cable laying modes exist, determining the first cable laying mode with the minimum expected heating power among the plurality of first cable laying modes as the target cable laying mode.
7. The method of claim 6, wherein the method further comprises:
if the first cable laying mode does not exist, a second cable laying mode with the minimum expected heating power is determined from a plurality of cable laying modes, and resistors or inductors with preset sizes are connected in series in the protection layers of the laid cables and the cables to be laid corresponding to the second cable laying mode, so that the target cable laying mode is obtained.
8. A device for determining a manner of cabling, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring structural information of a target cable tunnel and acquiring first information of laid cables and second information of cables to be laid in the target cable tunnel;
the first determining module is configured to determine a plurality of cabling manners according to the structural information, the first information and the second information, where the cabling manners include: the arrangement mode of the laid cable and the cable to be laid;
the second determining module is used for determining the cable sheath current and the expected heating power of the cable sheath current, which are generated by each cable laying mode at the target load level;
And the third determining module is used for determining a target cable laying mode from a plurality of cable laying modes according to the cable sheath current and the expected heating power corresponding to each cable laying mode.
9. A non-volatile storage medium, characterized in that the non-volatile storage medium comprises a stored computer program, wherein the device in which the non-volatile storage medium is located performs the method for determining the cabling method according to any one of claims 1 to 7 by running the computer program.
10. An electronic device, comprising: a memory and a processor, wherein the memory stores a computer program, the processor being configured to execute the method of determining the cabling scheme of any of claims 1 to 7 by the computer program.
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| CN202311467978.4A CN117810861A (en) | 2023-11-07 | 2023-11-07 | Method and device for determining cable laying mode |
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| CN202311467978.4A CN117810861A (en) | 2023-11-07 | 2023-11-07 | Method and device for determining cable laying mode |
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