CN117310259B - Method and device for determining double-loop cable sheath current - Google Patents
Method and device for determining double-loop cable sheath current Download PDFInfo
- Publication number
- CN117310259B CN117310259B CN202311562478.9A CN202311562478A CN117310259B CN 117310259 B CN117310259 B CN 117310259B CN 202311562478 A CN202311562478 A CN 202311562478A CN 117310259 B CN117310259 B CN 117310259B
- Authority
- CN
- China
- Prior art keywords
- double
- sheath
- determining
- matrix
- loop cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000011159 matrix material Substances 0.000 claims abstract description 126
- 238000000819 phase cycle Methods 0.000 claims abstract description 99
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 54
- 230000006698 induction Effects 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 9
- 239000011241 protective layer Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 abstract description 17
- 230000002159 abnormal effect Effects 0.000 abstract description 9
- 238000012545 processing Methods 0.000 description 11
- 230000006870 function Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Data Mining & Analysis (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computing Systems (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Algebra (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application discloses a method and a device for determining double-loop cable sheath current. Wherein the method comprises the following steps: under the condition that the load curve of the double-loop cable is unknown, determining an electromagnetic induction matrix B of the double-loop cable corresponding to the double-loop cross interconnection model, an electromagnetic induction matrix D generated by sheath current of the double-loop cable and an impedance matrix ZZ of the double-loop cable; according to the electromagnetic induction matrix B, an electromagnetic induction matrix D and an impedance matrix ZZ generated by the sheath current, determining the sheath current of the double-loop cable under different phase sequences; and determining the sheath current under the target phase sequence from the sheath currents under different phase sequences, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed the preset current value. The method solves the technical problems that the existing cable sheath current calculation method is low in calculation accuracy, the abnormal rise of the cable sheath current can not be explained from the root and the cause of the abnormal increase of the double-loop cable zero sequence sheath current value can not be solved.
Description
Technical Field
The application relates to the technical field of electrical engineering, in particular to a method and a device for determining double-loop cable sheath current.
Background
With the continuous improvement of the cable rate of the urban power network, the number of lines laid in parallel with the two high-voltage cables in the tunnel is increased. Because of the mutual influence between the two circuits, the excessive current of the cable sheath can be caused, and the safe operation of the cable is endangered. Therefore, the suppression of the current of the loop protection layer of the parallel cable in the same tunnel is of great importance to the safe and stable operation of the cable.
At present, in the calculation of the cable sheath current, the calculation is generally carried out according to a given formula in a cable design standard, the given formula adopts a simple theoretical model, the higher precision is not provided, the characteristic of the double-loop cable sheath current cannot be accurately represented, the abnormal rise of the cable sheath current cannot be fundamentally explained and solved, and the reason that the zero sequence sheath current value of the double-loop cable is abnormally increased is not solved. And the double-loop cross-connected cable line cannot play a good guiding role, and safety problems caused by overlarge sheath current can occur in engineering practice when the cable laying safety evaluation is designed and carried out according to the value.
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 double-loop cable sheath current, which are used for at least solving the technical problems that the existing cable sheath current calculation method is low in calculation accuracy, the abnormal rise of the cable sheath current and the abnormal increase of the double-loop cable zero sequence sheath current value cannot be fundamentally explained and solved.
According to an aspect of an embodiment of the present application, there is provided a method for determining a dual loop cable sheath current, including: under the condition that the load curve of the double-loop cable is unknown, determining an electromagnetic induction matrix B of the double-loop cable corresponding to the double-loop cross interconnection model, an electromagnetic induction matrix D generated by sheath current of the double-loop cable and an impedance matrix ZZ of the double-loop cable; according to the electromagnetic induction matrix B, an electromagnetic induction matrix D and an impedance matrix ZZ generated by the sheath current, determining the sheath current of the double-loop cable under different phase sequences; and determining the sheath current under the target phase sequence from the sheath currents under different phase sequences, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed the preset current value.
Optionally, determining the sheath current of the dual-loop cable under different sequences according to the electromagnetic induction matrix B, the electromagnetic induction matrix D generated by the sheath current, and the impedance matrix ZZ includes: determining an impedance matrix ZZ according to the electromagnetic induction matrix D; and determining the sheath currents of the double-loop cable under different phase sequences according to the electromagnetic inductance matrix B and the impedance matrix ZZ.
Alternatively, the electromagnetic inductance matrix B is determined by the following formula:
wherein, the method comprises the steps of, wherein,
，/>the influence matrix between the return cables is +.>，/>Respectively, the mutual influence matrix between two loops of cables, < >>Is the core current of the dual-loop cable.
Alternatively, the electromagnetic induction matrix D is determined by the following formula:
wherein, the method comprises the steps of, wherein,
，/>is a protective layer induction matrix>，/>The induction sheath of the core pair sheath between two loops of cables respectively,is the sheath current of the double loop cable.
Optionally, the impedance matrix ZZ is determined by the following formula:
wherein, the method comprises the steps of, wherein,
is a mutual inductance impedance matrix between double-loop cables, < >>Is the core radius of the double loop cable.
Optionally, the method further comprises: determining load distribution information of the dual-loop cable according to the load curve under the condition that the load curve of the dual-loop cable is known; and determining the sheath current under the target phase sequence according to the load distribution information of the double-loop cable, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed the preset current value.
Optionally, the method further comprises: under the condition that a plurality of sheath currents under the target phase sequences exist, heating power of the sheath currents under the target phase sequences is respectively determined; and determining the target phase sequence corresponding to the sheath current with the lowest heating power as a final target phase sequence.
According to another aspect of the embodiments of the present application, there is also provided a device for determining a dual-loop sheath current, including: the first determining module is used for determining an electromagnetic induction matrix B of the double-loop cable corresponding to the double-loop cross interconnection model, an electromagnetic induction matrix D generated by sheath current of the double-loop cable and an impedance matrix ZZ of the double-loop cable under the condition that a load curve of the double-loop cable is unknown; the second determining module is used for determining the sheath current of the double-loop cable under different phase sequences according to the electromagnetic induction matrix D generated by the sheath current and the impedance matrix ZZ; and the third determining module is used for determining the sheath current under the target phase sequence from the sheath currents under different phase sequences, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed the preset current value.
According to still another aspect of the embodiments of the present application, there is further provided a nonvolatile storage medium, in which a program is stored, wherein when the program runs, a device on which the nonvolatile storage medium is controlled to execute the method for determining the dual loop cable sheath current in any of the above embodiments.
According to still another aspect of the embodiments of the present application, there is also provided an electronic device, including: the device comprises a memory and a processor, wherein the processor is used for running a program stored in the memory, and the program is used for executing the method for determining the double loop cable sheath current in any embodiment.
In the embodiment of the application, under the condition that the load curve of the double-loop cable is unknown, an electromagnetic induction matrix B of the double-loop cable corresponding to the double-loop cross interconnection model, an electromagnetic induction matrix D generated by the sheath current of the double-loop cable and an impedance matrix ZZ of the double-loop cable are determined; according to the electromagnetic induction matrix B, an electromagnetic induction matrix D and an impedance matrix ZZ generated by the sheath current, determining the sheath current of the double-loop cable under different phase sequences; determining the sheath current under the target phase sequence from the sheath currents under different phase sequences, wherein the target phase sequence is a phase sequence mode with maximum probability that the sheath current does not exceed a preset current value, and performing numerical analysis by using matlab software to intuitively and comprehensively provide theoretical guidance for restraining the sheath current of the double-loop cable, so that modeling according to the basic theory of the electromagnetic induction law is realized, and the calculation accuracy is improved; the technical effects of calculating the sheath currents under different phase sequences and various load conditions are respectively calculated, and the technical problems that the calculation accuracy of the existing cable sheath current calculation method is low, the abnormal rise of the cable sheath current cannot be fundamentally explained and the cause of the abnormal rise of the zero sequence sheath current value of the double-loop cable can be 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 shows a block diagram of the hardware architecture of a computer terminal (or mobile device) for implementing a method of determining the double loop sheath current;
FIG. 2 is a flow chart of a method of determining a dual loop cable sheath current according to an embodiment of the present application;
FIG. 3 is a cross-sectional view of a dual circuit cable routing in accordance with an embodiment of the present application;
fig. 4 is a block diagram of a device for determining a double loop sheath current 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 the present application and the above figures 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.
In accordance with embodiments of the present application, there is provided an embodiment of a method of determining a dual loop sheath current, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer executable instructions, and, although a logical sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than that illustrated 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 a hardware architecture of a computer terminal (or mobile device) for implementing a method of determining a dual loop sheath current. 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 dual loop cable sheath current in the embodiments of the present application, and the processor 102 executes the software programs and modules stored in the memory 104 to perform various functional applications and data processing, that is, implement the method for determining a dual loop cable sheath current of the application program. 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 dual-loop cable sheath current, as shown in fig. 2, the method includes the following steps:
in step S202, when the load curve of the dual-loop cable is unknown, the electromagnetic induction matrix B of the dual-loop cable corresponding to the dual-loop cross-connect model, the electromagnetic induction matrix D generated by the sheath current of the dual-loop cable, and the impedance matrix ZZ of the dual-loop cable are determined.
As an optional embodiment of the present application, before executing step S202, relevant information of the abnormal cable line of the sheath current is collected by the cable lean platform, after the test and evaluation confirm, necessary information such as a tunnel section, an arrangement mode, a load current, a cable signal, a segment length and the like of the abnormal cable are collected, and if the cable load curve is not available (i.e. the load curve of the dual-loop cable mentioned in step S202 is unknown), an optimal phase sequence for making the sheath current not exceed the standard is found according to the current uniformity mode.
When executing step S202, establishing an electromagnetic inductance matrix of the dual-loop cross-connection model according to the cross-connection equivalent model diagram of the dual-loop cableElectromagnetic induction matrix generated by protective layer currentImpedance matrixWherein, the method comprises the steps of, wherein,the matrix is made up of four parts,，the impact matrix between the cables of a loop,，the mutual influence matrix between the two loops of cables is respectively,，in order to be a sheath-induced matrix,，the induction matrix of the wire core pair protection layer between the two cables is respectively.
Step S204, determining the sheath current of the dual-loop cable under different phase sequences according to the electromagnetic induction matrix D and the impedance matrix ZZ generated by the sheath current of the electromagnetic induction matrix B.
Step S206, determining the sheath current under the target phase sequence from the sheath currents under the different phase sequences, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed the preset current value.
To calculate the change phase sequence of the sheath current level under the condition of different phase sequences, the theoretical calculation value of the sheath current under the condition of different phase sequences is calculated. For the situation shown as an example, the possible phase sequence arrangement situations in 36 coexist, and the possible phase sequence situations in 36 are respectively calculated and selectedAnd selecting an optimal phase sequence combination, calculating the current levels of the protective layers under the conditions of different arrangement modes by respectively changing the coordinate positions of the cables according to 16 possible arrangement modes in the case of two lines of the 4 brackets and according to 16 different arrangement modes, and obtaining the optimal arrangement mode.
And carrying out analysis processing and calculation processing on 36 different calculation results to form a corresponding table, and selecting an optimal phase sequence and an optimal arrangement mode from the table so as to inhibit the sheath current from the root structure.
Through the steps, theoretical guidance can be intuitively and comprehensively provided for the double-loop cable sheath current inhibition by utilizing matlab software numerical analysis, so that modeling according to the basic theory of the electromagnetic induction law is realized, and the calculation accuracy is improved; and calculating the technical effects of the sheath currents under different phase sequences and various load conditions respectively.
According to an alternative embodiment of the present application, step S204 is performed to determine sheath currents of the dual-loop cable in different phases according to the electromagnetic induction matrix B, the electromagnetic induction matrix D generated by the sheath currents, and the impedance matrix ZZ, by the following method: determining an impedance matrix ZZ according to the electromagnetic induction matrix D; and determining the sheath currents of the double-loop cable under different phase sequences according to the electromagnetic inductance matrix B and the impedance matrix ZZ.
In the examples provided herein, sheath current=c×i; wherein,
i= [ I1; i2; i3; i4; i5; i6], I is the core current of the dual-loop cable;
c=gg×b, GG is a core current coefficient matrix;
gg=inv (ZZ), GG is the inverse of the impedance matrix ZZ.
Note that, the impedance matrix ZZ is described below.
According to some alternative embodiments of the present application, the electromagnetic inductance matrix B is determined by the following formula:
wherein, the method comprises the steps of, wherein,
，/>the influence matrix between the return cables is +.>，/>Respectively, the mutual influence matrix between two loops of cables, < >>Is the core current of the dual-loop cable.
The matrix is made up of four parts,，the impact matrix between the cables of a loop,，the mutual influence matrix between the two loops of cables is respectively shown.
According to further alternative embodiments of the present application, the electromagnetic induction matrix D is determined by the following formula:
wherein, the method comprises the steps of, wherein,
，/>is a protective layer induction matrix>，/>The induction sheath of the core pair sheath between two loops of cables respectively,is the sheath current of the double loop cable.
The D matrix is made up of four parts,，/>sheath sensing matrix->，/>The induction matrix of the wire core pair protection layer between the two cables is respectively.
In the method, in the process of the invention,，/>，/>for the length of the three-section cross-connect cable, +.>Is the electromagnetic inductance between two cables.
In some alternative embodiments of the present application, the impedance matrix ZZ is determined by the following equation:
wherein, the method comprises the steps of, wherein,
is a mutual inductance impedance matrix between double-loop cables, < >>Is the core radius of the double loop cable.
In the embodiment of the application, a matlab software is utilized to establish a double-loop cable sheath current calculation model, and if the double-loop cable sheath current calculation model is a uniform load line, a wire core of two loops is keyed inElectric current，/>And input the cross-connect segment length +.>，/>，/>Soil resistivity->Alternating current resistivity of the two-circuit line>，/>Ground resistance and ground resistance per unit length +.>，/>Core radius of each loop cable +.>，/>，/>，/>，/>，/>，/>，/>And the absolute coordinates of the two-loop cable, the initial current phase sequence of the cable core, and establishing a calculation model of the cable, wherein the cross section of the cable is shown in figure 3.
Modeling is performed through an electromagnetic induction law, and the loop distance of the double-loop cable is determined according to a construction drawing of the double-loop cable, wherein in an example, the double-loop circuit is arranged in a small article shape, the loop is arranged in a large article shape, the phase distance of the small articles is 200mm, and the phase distance of the large articles is 350mm. And solving for the distance between cablesEstablishing a mutual induction matrix between non-crossing double-circuit cables>And the induced electromotive force matrix generated by the core current +.>。
In the method, in the process of the invention,for the electromagnetic inductance matrix between the non-crossing interconnection cables, < > for>An induced electromotive force matrix generated for non-intersecting interconnect cable core currents, < >>Is the electromagnetic inductance between two cables, < ->Is the equivalent loop depth of the earth, < >>Is the average geometric radius of the cable sheath.
In further alternative embodiments of the present application, where the load profile of the dual-loop cable is known, the load profile information of the dual-loop cable is determined from the load profile; and determining the sheath current under the target phase sequence according to the load distribution information of the double-loop cable, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed the preset current value.
Based on the current data, a determination is made that if no load curve is given, a calculation model of uniform load (i.e., the calculated sheath current mentioned aboveIs a method of (1); if a non-uniform model is adopted, calculating a given optimal phase sequence; and if the load curve is given, the annual load data is analyzed according to the load distribution, the load is divided in units of hours, the load in different time periods is calculated by using a circulating structure, and under the corresponding load curve, the phase sequence which makes the probability of the sheath current not exceeding the standard maximum is searched.
As some optional embodiments of the present application, in the case where there are a plurality of sheath currents under the target phase sequences, the heating power of the sheath currents under the respective target phase sequences is determined separately; and determining the target phase sequence corresponding to the sheath current with the lowest heating power as a final target phase sequence.
In the embodiment of the application, if multiple optimal phase sequences exist, the optimal phase sequence is determined by calculating the heating power of the sheath current and determining the phase sequence corresponding to the sheath current with the lowest heating power.
The technical core of the application is that modeling is firstly carried out through an electromagnetic induction law, and a mutual induction matrix between double-circuit cables is establishedAnd the induced electromotive force matrix generated by the core current +.>Then, taking the characteristics of the cross interconnection of the double-loop cable into consideration, establishing an electromagnetic induction matrix D, a comprehensive impedance matrix Z and an induced electromotive force matrix E generated by core current after the cross interconnection, and then carrying out corresponding programming comprehensive analysis on codes by using matlab to solve the current matrix of each phase sheath of the double-loop cable>And the optimal phase sequence is considered by changing the phase sequence of the cable core current; and taking the amplitude value of the core current into consideration, and providing theoretical guidance for newly-built cable lines and the laying distance between the lines.
Fig. 4 is a block diagram of a device for determining a double loop sheath current according to an embodiment of the present application, as shown in fig. 4, the device includes:
the first determining module 40 is configured to determine, when the load curve of the dual-loop cable is unknown, an electromagnetic induction matrix B of the dual-loop cable corresponding to the dual-loop cross-connect model, an electromagnetic induction matrix D generated by a sheath current of the dual-loop cable, and an impedance matrix ZZ of the dual-loop cable.
The second determining module 42 is configured to determine the sheath current of the dual-loop cable under different phase sequences according to the electromagnetic induction matrix D generated by the sheath current and the impedance matrix ZZ.
A third determining module 44 is configured to determine the sheath current under the target phase sequence from the sheath currents under the different phase sequences, where the target phase sequence is a phase sequence that maximizes the probability that the sheath current does not exceed the preset current value.
Note that each module in the above-mentioned determination device for a double loop sheath current may be a program module (for example, a set of program instructions for implementing a specific function), or may be a hardware module, and for the latter, it may be represented by the following form, but is not limited thereto: the expression forms of the modules are all a processor, or the functions of the modules are realized by one processor.
It should be noted that, the preferred implementation manner of the embodiment shown in fig. 4 may refer to the related description of the embodiment shown in fig. 2, which is not repeated herein.
The embodiment of the application also provides a nonvolatile storage medium, wherein a program is stored in the nonvolatile storage medium, and the device where the nonvolatile storage medium is controlled to execute the method for determining the double-loop cable sheath current in any embodiment when the program runs.
The above-described nonvolatile storage medium is used to store a program that performs the following functions: under the condition that the load curve of the double-loop cable is unknown, determining an electromagnetic induction matrix B of the double-loop cable corresponding to the double-loop cross interconnection model, an electromagnetic induction matrix D generated by sheath current of the double-loop cable and an impedance matrix ZZ of the double-loop cable; according to the electromagnetic induction matrix B, an electromagnetic induction matrix D and an impedance matrix ZZ generated by the sheath current, determining the sheath current of the double-loop cable under different phase sequences; and determining the sheath current under the target phase sequence from the sheath currents under different phase sequences, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed the preset current value.
The embodiment of the application also provides electronic equipment, which comprises: the device comprises a memory and a processor, wherein the processor is used for running a program stored in the memory, and the program is used for executing the method for determining the double loop cable sheath current in any embodiment.
The processor is configured to execute a program that performs the following functions: under the condition that the load curve of the double-loop cable is unknown, determining an electromagnetic induction matrix B of the double-loop cable corresponding to the double-loop cross interconnection model, an electromagnetic induction matrix D generated by sheath current of the double-loop cable and an impedance matrix ZZ of the double-loop cable; according to the electromagnetic induction matrix B, an electromagnetic induction matrix D and an impedance matrix ZZ generated by the sheath current, determining the sheath current of the double-loop cable under different phase sequences; and determining the sheath current under the target phase sequence from the sheath currents under different phase sequences, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed the preset current value.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent 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 the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be 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 on 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 essentially or a part contributing to the related art or all or part of the technical solution may be embodied 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 described in 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 (8)
1. A method for determining a double loop cable sheath current, comprising:
under the condition that the load curve of the double-loop cable is unknown, determining an electromagnetic induction matrix B of the double-loop cable corresponding to the double-loop cross interconnection model, an electromagnetic induction matrix D generated by sheath current of the double-loop cable and an impedance matrix ZZ of the double-loop cable;
according to the electromagnetic inductance matrix B, an electromagnetic induction matrix D and an impedance matrix ZZ generated by the sheath current, determining the sheath current of the dual-loop cable under different phase sequences;
determining sheath current under a target phase sequence from the sheath currents under different phase sequences, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed a preset current value;
under the condition that a plurality of sheath currents under the target phase sequences exist, respectively determining heating power of the sheath currents under the target phase sequences; determining a target phase sequence corresponding to the sheath current with the lowest heating power as a final target phase sequence;
determining load distribution information of the double-loop cable according to a load curve under the condition that the load curve of the double-loop cable is known; and determining the sheath current under a target phase sequence according to the load distribution information of the dual-loop cable, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed a preset current value.
2. The method of claim 1, wherein determining sheath currents of the dual-loop cable in different phases from the electromagnetic induction matrix B, the electromagnetic induction matrix D generated by sheath currents, and the impedance matrix ZZ, comprises:
determining the impedance matrix ZZ according to the electromagnetic induction matrix D;
and determining the sheath current of the dual-loop cable under different phase sequences according to the electromagnetic inductance matrix B and the impedance matrix ZZ.
3. The method according to claim 1, wherein the electromagnetic reactance matrix B is determined by the following formula:
wherein, the method comprises the steps of, wherein,
，/>the influence matrix between the return cables is +.>，/>Respectively, the mutual influence matrix between two loops of cables, < >>Is the core current of the dual-loop cable.
4. The method according to claim 1, wherein the electromagnetic induction matrix D is determined by the following formula:
wherein, the method comprises the steps of, wherein,
，/>is a protective layer induction matrix>，/>The induction sheath of the core pair sheath between two loops of cables respectively,and (3) providing protection layer current for the double-loop cable.
5. The method according to claim 1, wherein the impedance matrix ZZ is determined by the following formula:
wherein, the method comprises the steps of, wherein,
for the mutual inductance impedance matrix between the two loop cables, < >>Is the core radius of the double loop cable.
6. A dual loop cable sheath current determination apparatus comprising:
the first determining module is used for determining an electromagnetic induction matrix B of the double-loop cable corresponding to the double-loop cross interconnection model under the condition that the load curve of the double-loop cable is unknown, and an electromagnetic induction matrix D generated by the sheath current of the double-loop cable and an impedance matrix ZZ of the double-loop cable;
the second determining module is used for determining the sheath current of the dual-loop cable under different phase sequences according to the electromagnetic induction matrix B, the electromagnetic induction matrix D generated by the sheath current and the impedance matrix ZZ;
a third determining module, configured to determine a sheath current under a target phase sequence from the sheath currents under the different phase sequences, where the target phase sequence is a phase sequence that makes a probability that the sheath current does not exceed a preset current value maximum;
the device for determining the double-loop cable sheath current is further used for determining heating power of the sheath current under each target phase sequence respectively under the condition that a plurality of sheath currents under the target phase sequence exist; determining a target phase sequence corresponding to the sheath current with the lowest heating power as a final target phase sequence;
the device for determining the double-loop cable sheath current is further used for determining the load distribution information of the double-loop cable according to the load curve under the condition that the load curve of the double-loop cable is known; and determining the sheath current under a target phase sequence according to the load distribution information of the dual-loop cable, wherein the target phase sequence is the phase sequence with the highest probability that the sheath current does not exceed a preset current value.
7. A non-volatile storage medium, wherein a program is stored in the non-volatile storage medium, and wherein the program, when executed, controls a device in which the non-volatile storage medium is located to perform the method for determining the double loop cable sheath current according to any one of claims 1 to 5.
8. An electronic device, comprising: a memory and a processor for running a program stored in the memory, wherein the program is run to perform the method of determining a double loop sheath current according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311562478.9A CN117310259B (en) | 2023-11-22 | 2023-11-22 | Method and device for determining double-loop cable sheath current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311562478.9A CN117310259B (en) | 2023-11-22 | 2023-11-22 | Method and device for determining double-loop cable sheath current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117310259A CN117310259A (en) | 2023-12-29 |
| CN117310259B true CN117310259B (en) | 2024-03-15 |
Family
ID=89281301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311562478.9A Active CN117310259B (en) | 2023-11-22 | 2023-11-22 | Method and device for determining double-loop cable sheath current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117310259B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593944A (en) * | 2009-03-19 | 2009-12-02 | 江苏省电力公司苏州供电公司 | The single-core power cables method for pre-controlling cross interconnected sheathing induction current |
| CN114089108A (en) * | 2021-11-17 | 2022-02-25 | 广东电网有限责任公司广州供电局 | Cable sheath defect identification method, device, equipment and readable storage medium |
| CN114741899A (en) * | 2022-04-29 | 2022-07-12 | 西安交通大学 | Buried cable high-frequency electrical parameter calculation method based on electromagnetic modal analysis |
| CN114878966A (en) * | 2022-05-17 | 2022-08-09 | 国家电网有限公司 | High-voltage cable induction parameter estimation method and system and readable storage medium |
| CN114878967A (en) * | 2022-05-17 | 2022-08-09 | 国家电网有限公司 | High-voltage cable line fault positioning method and system and readable storage medium |
| CN115201715A (en) * | 2022-07-14 | 2022-10-18 | 国家电网有限公司 | Method and system for identifying grounding fault mode of cross-connection high-voltage cable sheath |
| CN116298562A (en) * | 2023-03-14 | 2023-06-23 | 江苏方天电力技术有限公司 | Multi-loop cable sheath current overload processing method, storage medium and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220369947A1 (en) * | 2021-05-20 | 2022-11-24 | Analog Devices International Unlimited Company | Estimation of distally-located multiport network parameters using multiple two-wire proximal measurements |
-
2023
- 2023-11-22 CN CN202311562478.9A patent/CN117310259B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593944A (en) * | 2009-03-19 | 2009-12-02 | 江苏省电力公司苏州供电公司 | The single-core power cables method for pre-controlling cross interconnected sheathing induction current |
| CN114089108A (en) * | 2021-11-17 | 2022-02-25 | 广东电网有限责任公司广州供电局 | Cable sheath defect identification method, device, equipment and readable storage medium |
| CN114741899A (en) * | 2022-04-29 | 2022-07-12 | 西安交通大学 | Buried cable high-frequency electrical parameter calculation method based on electromagnetic modal analysis |
| CN114878966A (en) * | 2022-05-17 | 2022-08-09 | 国家电网有限公司 | High-voltage cable induction parameter estimation method and system and readable storage medium |
| CN114878967A (en) * | 2022-05-17 | 2022-08-09 | 国家电网有限公司 | High-voltage cable line fault positioning method and system and readable storage medium |
| CN115201715A (en) * | 2022-07-14 | 2022-10-18 | 国家电网有限公司 | Method and system for identifying grounding fault mode of cross-connection high-voltage cable sheath |
| CN116298562A (en) * | 2023-03-14 | 2023-06-23 | 江苏方天电力技术有限公司 | Multi-loop cable sheath current overload processing method, storage medium and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117310259A (en) | 2023-12-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2562931C2 (en) | Method and device for localisation of fault to ground | |
| CN106463945B (en) | The system and method for fault section in polyphase electric power network for identification | |
| EP1739441B1 (en) | Method and system for determining location of phase-to-earth fault | |
| Santos et al. | Dynamic simulation of induced voltages in high voltage cable sheaths: Steady state approach | |
| CN109738714A (en) | The method and device of secondary nuclear phase | |
| CN105243197A (en) | Single-core power cable resonance analysis method based on finite element simulation and equivalent circuit | |
| CN117310259B (en) | Method and device for determining double-loop cable sheath current | |
| CN114707302A (en) | Parallel cable current distribution calculation method and system in cross-connection grounding mode | |
| CN106162668A (en) | The method and apparatus determining network parameter | |
| Bakkabulindi et al. | Models for conductor size selection in Single Wire Earth Return distribution networks | |
| CN103559657A (en) | Electric transmission line data processing method and system | |
| CN117810861A (en) | Method and device for determining cable laying mode | |
| CN114595616B (en) | Abnormal point extraction method and device for irregular cable arrangement | |
| CN115097189A (en) | Cross interconnection cable sheath circulation calculation method and device, electronic equipment and medium | |
| CN117214501A (en) | Current determination method, apparatus, nonvolatile storage medium, and computer device | |
| CN103033720A (en) | Multi-core cable long distance distinguishing method | |
| CN108429640B (en) | Display method and device for nodes of network equipment | |
| CN117092392A (en) | Current processing method, apparatus, nonvolatile storage medium, and computer device | |
| US20230324450A1 (en) | Method for locating a fault point on a high-voltage three-phase ac cable, and system for locating a fault point | |
| CN115406337B (en) | Ground wire coordinate calculation method and device based on resistance type strain sensor | |
| CN115267337B (en) | Method and device for determining wide area soil resistivity and storage medium | |
| CN114336766B (en) | Multi-feed-in short circuit ratio constraint linearization method for grid topology decision optimization | |
| CN110535067B (en) | Method and system for laying multi-loop high-voltage cable in cable channel | |
| CN104361209A (en) | Method for obtaining line parameters under various frameworks | |
| CN111969653A (en) | Method for adjusting power of tie line based on linear programming algorithm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |