CN117214501A - Current determination method, apparatus, nonvolatile storage medium, and computer device - Google Patents

Current determination method, apparatus, nonvolatile storage medium, and computer device Download PDF

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Publication number
CN117214501A
CN117214501A CN202311069589.6A CN202311069589A CN117214501A CN 117214501 A CN117214501 A CN 117214501A CN 202311069589 A CN202311069589 A CN 202311069589A CN 117214501 A CN117214501 A CN 117214501A
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China
Prior art keywords
cable
target
fitting
formula
circulation
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Inventor
马宪伟
赵洋
郭甜
程养春
李金鑫
黄子健
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State Grid Corp of China SGCC
North China Electric Power University
State Grid Beijing Electric Power Co Ltd
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State Grid Corp of China SGCC
North China Electric Power University
State Grid Beijing Electric Power Co Ltd
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Priority to CN202311069589.6A priority Critical patent/CN117214501A/en
Publication of CN117214501A publication Critical patent/CN117214501A/en
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    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Abstract

The invention discloses a current determination method, a current determination device, a nonvolatile storage medium and computer equipment. Wherein the method comprises the following steps: acquiring a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of a target three-phase cable of a target cable cross-connection grounding circuit; according to a predetermined corresponding relation between the cable laying mode and a cable circulation estimation formula, determining the cable circulation estimation formula corresponding to the laying mode of the target three-phase cable as a target cable circulation estimation formula; and (3) taking the target ground resistance, the target three-phase load current unbalance and the target segment unbalance into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation, and determining the cable circulation value of the target cable cross-connection ground loop. The invention solves the technical problem that the cable loop current value is inaccurate because the factors such as the ground resistance value or the three-phase current unbalance degree are not considered when the cable loop current value is determined in the related technology.

Description

Current determination method, apparatus, nonvolatile storage medium, and computer device
Technical Field
The invention relates to the technical field of power equipment state evaluation, in particular to a current determination method, a device, a nonvolatile storage medium and computer equipment.
Background
The power cable has become the power transmission and distribution mode mainly adopted by the urban power network in all large and medium cities worldwide, and has the advantages of low operation and maintenance cost, higher power supply reliability, smaller occupied area, contribution to urban planning, attractive appearance and the like compared with overhead line power transmission. The metal sleeve sheath circulating current (also can be called cable circulating current or circulating current) can directly reflect the operation state of the cable metal sleeve and the metal sleeve sheath circulating current system, and is one of important bases for evaluating the operation reliability of the high-voltage cable circuit.
The circulation current of the grounding system in a normal state can be influenced by various influencing factors such as a cable laying mode, a grounding resistance, three-phase current unbalance degree, three-phase segmentation unbalance degree and the like so as to change. However, the current research stays in the influence of a single influence factor on the grounding circulation of the metal sheath, quantitative analysis is not performed on the influence of the circulation, the influence factor and the law of the circulation are not comprehensively mastered, and the influence law of the circulation is rarely in deep research at present when a plurality of influence factors exist simultaneously, so that the obtained cable circulation is greatly influenced by various influence factors, and an accurate cable circulation value cannot be obtained.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a current determination method, a device, a nonvolatile storage medium and computer equipment, which at least solve the technical problem that the cable loop current value is inaccurate because the factors such as a grounding resistance value or three-phase current unbalance are not considered when the cable loop current value is determined in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a current determination method including: acquiring a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of a target three-phase cable of a target cable cross-connection grounding circuit; according to the corresponding relation between the preset cable laying mode and the cable circulation estimation formula, determining the cable circulation estimation formula corresponding to the laying mode of the target three-phase cable as the target cable circulation estimation formula, wherein the cable laying mode comprises at least one of the following steps: horizontal laying, right angle laying and triangular laying; carrying the target ground resistance, the target three-phase load current unbalance and the target segment unbalance into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation; and determining the cable loop value of the target cable cross-connection ground loop according to the estimated value of the target cable loop.
Optionally, determining the cable loop current value of the target cable cross-connect ground loop according to the estimated value of the target cable loop current comprises: obtaining a target three-phase load current average value of a target cable cross-connection grounding circuit; determining a three-phase load current average value corresponding to a target cable circulation estimation formula; determining the ratio of the target three-phase load current average value to the three-phase load current average value corresponding to the target cable loop current estimation formula; and determining the cable loop value of the target cable cross-connection ground loop according to the ratio and the estimated value of the target cable loop.
Optionally, the correspondence between the cabling scheme and the cable loop estimation formula is determined by: setting an experimental cable cross-connection grounding circuit laid in a cable laying mode; setting loop current influence parameters of the experimental cable cross-connection grounding circuit by using a plurality of groups of parameter values respectively, and determining experimental cable loop current values corresponding to the plurality of groups of parameter values respectively, wherein the loop current influence parameters comprise at least one of the following: ground resistance value, three-phase load current unbalance degree and segmentation unbalance degree; fitting according to experimental cable circulation values corresponding to the multiple groups of parameter values to obtain a cable circulation estimation formula; and determining that the cable laying mode corresponds to the cable circulation estimation formula to obtain a corresponding relation.
Optionally, under the condition that the circulation affecting parameter includes a ground resistance value, a three-phase load current unbalance degree and a segmentation unbalance degree, fitting to obtain a cable circulation estimation formula according to experimental cable circulation values respectively corresponding to a plurality of groups of parameter values, including: fitting a correlation between the experimental cable loop current values and the imbalance degree of the three-phase load current according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula; fitting a correlation between the experimental cable loop current values and the sectional unbalance according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula; and determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula.
Optionally, determining the cable circulation estimation formula according to the first fitting formula and the second fitting formula includes: fitting a correlation between the experimental cable loop current values and the imbalance degree of the three-phase load current by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula; fitting a correlation between the grounding resistance value and the slope of the first fitting formula by adopting an exponential function according to experimental cable loop current values respectively corresponding to a plurality of groups of parameter values to obtain a third fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the third fitting formula.
Optionally, determining the cable circulation estimation formula according to the first fitting formula and the second fitting formula further comprises: fitting a correlation between the experimental cable loop current values and the sectional unbalance degree by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula; fitting a correlation between the grounding resistance value and the slope of the second fitting formula by adopting an exponential function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fourth fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fourth fitting formula.
Optionally, determining the cable circulation estimation formula according to the first fitting formula and the second fitting formula further comprises: fitting a correlation between the experimental cable loop current values and the grounding resistance values by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fifth fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fifth fitting formula.
According to another aspect of the embodiment of the present invention, there is also provided a current determining apparatus including: the acquisition module is used for acquiring a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of the target three-phase cable of the target cable cross-connection grounding circuit; the first determining module is configured to determine, according to a predetermined correspondence between a cable laying manner and a cable circulation estimation formula, that a cable circulation estimation formula corresponding to the laying manner of the target three-phase cable is a target cable circulation estimation formula, where the cable laying manner includes at least one of: horizontal laying, right angle laying and triangular laying; the substituting module is used for substituting the target ground resistance, the target three-phase load current unbalance and the target segment unbalance into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation; and the second determining module is used for determining the cable circulation value of the target cable cross-connection ground loop according to the estimated value of the target cable circulation.
According to still another aspect of the embodiments of the present invention, there is further provided a nonvolatile storage medium including a stored program, wherein a device in which the nonvolatile storage medium is controlled to execute any one of the above-described current determining methods when the program runs.
According to still another aspect of the embodiments of the present invention, there is further provided a computer device, including a processor configured to execute a program, where the program executes any one of the current determining methods described above.
In the embodiment of the invention, a current determination mode is adopted, and a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of a target three-phase cable of a target cable cross-connection grounding circuit are obtained; according to the corresponding relation between the preset cable laying mode and the cable circulation estimation formula, determining the cable circulation estimation formula corresponding to the laying mode of the target three-phase cable as the target cable circulation estimation formula, wherein the cable laying mode comprises at least one of the following steps: horizontal laying, right angle laying and triangular laying; carrying the target ground resistance, the target three-phase load current unbalance and the target segment unbalance into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation; according to the estimated value of the target cable circulation, the cable circulation value of the target cable cross-connection ground loop is determined, the purpose that the cable circulation value is influenced by the cable laying mode, the grounding resistance, the three-phase current unbalance degree and the three-phase segmentation unbalance degree is achieved, the technical effect of obtaining the accurate cable circulation value is achieved, and the technical problem that the cable circulation value is inaccurate due to the fact that factors such as the grounding resistance value or the three-phase current unbalance degree are not considered when the cable circulation value is determined in the related art is 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 specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 shows a hardware block diagram of a computer terminal for implementing a current determination method;
FIG. 2 is a flow chart of a current determination method provided according to an embodiment of the present application;
FIG. 3 is a graph of cable loop current values versus three-phase load current imbalance σ for different lay-down modes provided in accordance with an alternative embodiment of the present application;
FIG. 4 is a graph showing the relationship between ground circulating current and current imbalance sigma provided in accordance with an alternative embodiment of the present applicationSlope k of curve 1 And ground resistance R d Is a relationship diagram of (1);
FIG. 5 is a schematic diagram of a grounding resistor R provided in accordance with an alternative embodiment of the present application d A graph of the relationship between the circulation and the segment unbalance a in different laying modes when the graph is=0.5Ω;
FIG. 6 is a graph showing the slope k of a ground loop versus segment imbalance a for various modes of laying according to an alternative embodiment of the present application 2 And ground resistance R d Is a relationship diagram of (1);
FIG. 7 shows a ground loop current and a ground resistance R according to an alternative embodiment of the present application d Is a relationship diagram of (1);
FIG. 8 is a horizontal applied lower ground resistance R provided in accordance with an alternative embodiment of the present invention d An influence relation graph of relation between circulation and current unbalance sigma;
fig. 9 is a block diagram of a current determining apparatus provided according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention 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 the embodiments of the invention 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 an embodiment of the present application, a method embodiment of current determination is provided, it being noted that the steps shown 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 order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order other than that shown or described herein.
The method according to the first embodiment of the present application may be implemented in a mobile terminal, a computer terminal or a similar computing device. Fig. 1 shows a block diagram of a hardware configuration of a computer terminal for implementing a current determination method. As shown in fig. 1, the computer terminal 10 may include one or more (shown as 102a, 102b, … …,102 n) processors (which may include, but are not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data. 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 and/or other data processing circuits described above may be referred to herein generally 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. As referred to in embodiments of the application, the data processing circuit acts as a processor control (e.g., selection of the path of the variable resistor termination connected to the 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 current determining method in the embodiments of the present application, and the processor executes the software programs and modules stored in the memory 104, thereby performing various functional applications and data processing, that is, implementing the current determining method 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, 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 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.
Fig. 2 is a flow chart of a current determining method according to an embodiment of the present invention, as shown in fig. 2, the method includes the following steps:
step S202, obtaining a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of a target three-phase cable of the target cable cross-connection grounding circuit.
In the step, the target cable cross-connection grounding circuit is a circuit which needs to determine metal sleeve grounding circulation, and parameters such as a grounding resistance value, a three-phase load current value and the like of the target cable cross-connection grounding circuit can be measured, so that the target three-phase load current unbalance degree and the target segmentation unbalance degree are determined. Because the cabling modes of the cables are different, the metal sleeve joint circulation values are also different, and therefore the cabling mode of the three-phase cables of the target cable cross-connection grounding circuit can be obtained. The target three-phase load current unbalance degree can be obtained by respectively measuring three-phase current values, calculating an average current value of the measured three-phase current values, and dividing the difference between the measured maximum current value and the measured minimum current value by the average current value.
Step S204, determining a cable circulation estimation formula corresponding to the cable laying mode of the target three-phase cable as a target cable circulation estimation formula according to a corresponding relation between the predetermined cable laying mode and the cable circulation estimation formula, wherein the cable laying mode comprises at least one of the following steps: horizontal laying, right angle laying and triangular laying.
Step S206, the target ground resistance, the target three-phase load current unbalance and the target segment unbalance are brought into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation.
In the two steps, the corresponding cable circulation estimation formulas under the three laying modes of horizontal laying, right angle laying and triangular laying can be obtained, namely, the corresponding relation between the predetermined cable laying mode and the cable circulation estimation formula. Then, a target cable circulation estimation formula corresponding to the laying mode of the target three-phase cable can be determined. And (3) bringing the target ground resistance, the target three-phase load current unbalance and the target segment unbalance obtained in the step (S201) into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation. Wherein the three-phase load current imbalance may also be referred to as current imbalance.
Step S208, determining the cable loop current value of the target cable cross-connection ground loop according to the estimated value of the target cable loop current.
Through the steps, the purpose that the cable loop current value is influenced by the cable laying mode, the grounding resistance, the three-phase current unbalance degree and the three-phase segmentation unbalance degree is achieved, so that the technical effect of obtaining the accurate cable loop current value is achieved, and the technical problem that the cable loop current value is inaccurate due to the fact that the cable laying mode, the grounding resistance, the three-phase current unbalance degree and the three-phase segmentation unbalance degree are influenced together is solved.
As an alternative embodiment, determining a cable loop current value of the target cable cross-connect ground loop based on the estimated value of the target cable loop current, comprises: obtaining a target three-phase load current average value of a target cable cross-connection grounding circuit; determining a three-phase load current average value corresponding to a target cable circulation estimation formula; determining the ratio of the target three-phase load current average value to the three-phase load current average value corresponding to the target cable loop current estimation formula; and determining the cable loop value of the target cable cross-connection ground loop according to the ratio and the estimated value of the target cable loop.
Alternatively, the preset cable loop estimation formula may be determined based on experimental data, but the circuit condition of the experimental data may be different from the circuit condition of the target cable cross-connect ground circuit, resulting in inaccurate estimation of the target cable loop by the target cable loop estimation formula. At the moment, the three-phase load current average value during measurement of experimental data and the target three-phase load current average value of the target cable cross-connection ground loop can be determined, and the estimated value of the target cable loop current is corrected according to the target three-phase load current average value, so that the cable loop current value of the target cable cross-connection ground loop is obtained more accurately.
The average value of the three-phase load current can be obtained by measuring the three-phase load current values separately and then calculating the average value. Specifically, taking 400A as an example of the three-phase load current average value corresponding to the target cable loop current estimation formula, determining that the ratio of the target three-phase load current average value I to the three-phase load current average value corresponding to the target cable loop current estimation formula isEstimated value y based on the ratio and the target cable loop current 400 By->The cable loop current value y of the target cable cross-connect ground loop can be obtained.
As a specific embodiment, the following steps may be used to determine the cable circulation value of the intersecting interconnection section of a cable metal sheath grounding system:
firstly, actually measuring the grounding resistance R of a cross interconnection section of a cable metal sheath grounding system d Three-phase load current unbalance degree sigma, segment unbalance degree a, three-phase cable laying mode and three-phase load current average value I.
Step two, calculating the circulation y under the condition that the average value of the three-phase load current is 400A by using the following fitting formula 400 ：
1) If the cable is laid in a triangle, y 400 Calculated according to the following fitting formula: y is 400 ＝k 1 σ+k 2 a, wherein, the method comprises the steps of,
2) If the cable is laid horizontally, y 400 Calculated according to the following fitting formula:
wherein,
3) If the cable is laid at right angles, y 400 Calculated according to the following fitting formula:
wherein,
third, the load current average is calculated using the following formulaCable circulation number y at value I (in ampere a):
as an alternative embodiment, the correspondence between the cabling scheme and the cable loop estimation formula is determined by: setting an experimental cable cross-connection grounding circuit laid in a cable laying mode; setting loop current influence parameters of the experimental cable cross-connection grounding circuit by using a plurality of groups of parameter values respectively, and determining experimental cable loop current values corresponding to the plurality of groups of parameter values respectively, wherein the loop current influence parameters comprise at least one of the following: ground resistance value, three-phase load current unbalance degree and segmentation unbalance degree; fitting according to experimental cable circulation values corresponding to the multiple groups of parameter values to obtain a cable circulation estimation formula; and determining that the cable laying mode corresponds to the cable circulation estimation formula to obtain a corresponding relation.
Optionally, three experimental cable cross-connection grounding circuits including horizontal laying, right angle laying and triangular laying may be respectively set, and multiple sets of circulation affecting parameter values are set under each laying mode, where each set of circulation affecting parameter values includes at least one of the following: the method comprises the steps of matching a ground resistance value, three-phase load current unbalance degree and segmentation unbalance degree, wherein each set of circulation influence parameter values corresponds to an experimental cable circulation value, and according to a plurality of sets of parameter values and the experimental cable circulation values under different laying modes, a cable circulation estimation formula under different laying modes can be obtained by fitting, and then the corresponding relation between the cable laying modes and the cable circulation estimation formula is obtained.
As an optional embodiment, in the case that the circulation affecting parameter includes a ground resistance value, a three-phase load current imbalance degree and a segment imbalance degree, fitting to obtain a cable circulation estimation formula according to experimental cable circulation values respectively corresponding to a plurality of sets of parameter values, including: fitting a correlation between the experimental cable loop current values and the imbalance degree of the three-phase load current according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula; fitting a correlation between the experimental cable loop current values and the sectional unbalance according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula; and determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula.
Optionally, according to a control variable method, multiple groups of three-phase load current unbalance degrees and corresponding experimental cable loop current values under different laying modes can be selected from experimental cable loop current values corresponding to multiple groups of parameter values, and the first fitting formula is obtained through fitting. And selecting a plurality of groups of sectional unbalance degrees and corresponding experimental cable loop current values under different laying modes from the experimental cable loop current values corresponding to the plurality of groups of parameter values according to a control variable method, and fitting to obtain a second fitting formula. The first fitting equation and the second fitting equation are combined to determine a cable circulation estimation equation.
As an alternative embodiment, determining the cable loop estimation formula according to the first fitting formula and the second fitting formula comprises: fitting a correlation between the experimental cable loop current values and the imbalance degree of the three-phase load current by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula; fitting a correlation between the grounding resistance value and the slope of the first fitting formula by adopting an exponential function according to experimental cable loop current values respectively corresponding to a plurality of groups of parameter values to obtain a third fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the third fitting formula.
Alternatively, FIG. 3 is a graph showing the relationship between the current value of the cable loop and the unbalance degree sigma of the three-phase load current in different laying modes according to an alternative embodiment of the present invention, as shown in FIG. 3, the relationship between the current value of the cable loop and the unbalance degree sigma of the three-phase load current in different laying modes can be basically approximated as a linear function, and the slope of the linear function can be defined as k 1 And, slope k corresponding to different laying modes 1 Nor is it the same. The current unbalance degree and the grounding loop value under different grounding resistances can be calculated, so that the slope k1 of the relation curve between the grounding loop current and the current unbalance degree sigma under different grounding resistances is obtained, and the first fitting formula is determined. FIG. 4 is an alternative embodiment according to the present inventionThe embodiment provides a slope k of the ground loop versus current imbalance sigma curve 1 And ground resistance R d As shown in FIG. 4, it can be seen that the slope decreases as the ground resistance increases, and a third fitting equation can be obtained by fitting the obtained sets of ground resistances to the slopesAnd according to the first fitting formula, the second fitting formula and the third fitting formula, a cable circulation estimation formula can be further determined.
As an alternative embodiment, determining the cable circulation estimation formula according to the first fitting formula and the second fitting formula further comprises: fitting a correlation between the experimental cable loop current values and the sectional unbalance degree by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula; fitting a correlation between the grounding resistance value and the slope of the second fitting formula by adopting an exponential function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fourth fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fourth fitting formula.
Optionally, FIG. 5 is a ground resistor R provided in accordance with an alternative embodiment of the present invention d As shown in fig. 5, the relationship between the loop current and the segment unbalance a in different laying modes is shown by the slope k of the relationship between the ground loop current and the segment unbalance a corresponding to different ground resistances in different laying modes 2 Different laying modes can be approximately considered as linear relations, and the slope is related to the interval of the laying modes, and the larger the phase interval is, the larger the slope is. FIG. 6 is a graph showing the slope k of a ground loop versus segment imbalance a for various modes of laying according to an alternative embodiment of the present invention 2 And ground resistance R d As shown in FIG. 6, it can be seen that the slope decreases with increasing ground resistance, according to the resulting multiple setsThe ground resistance is fitted with the slope, so that the slope under different laying modes can be obtained. Specifically, the fourth fitting formula under the triangle laying mode is thatAnd according to the second fitting formula and the fourth fitting formula, the relation between the grounding resistance value and the segmentation unbalance and the grounding loop current value can be obtained, and according to the first fitting formula, the second fitting formula and the fourth fitting formula, a cable loop current estimation formula can be further determined.
As an alternative embodiment, determining the cable circulation estimation formula according to the first fitting formula and the second fitting formula further comprises: fitting a correlation between the experimental cable loop current values and the grounding resistance values by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fifth fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fifth fitting formula.
Alternatively, the corresponding relationship may be obtained according to the circulation currents corresponding to different ground resistances in different laying modes. FIG. 7 shows a ground loop current and a ground resistance R according to an alternative embodiment of the present invention d As shown in FIG. 7, will be only subjected to the ground resistance R d The sheath circulation size in the influence is defined as b, and is irrelevant to the grounding resistance in the case of the triangle close-fitting laying mode, namely b 3 =0. And fitting the correlation between the experimental cable loop current value and the grounding resistance value by adopting a primary function to obtain a fifth fitting formula. Specifically, the ground resistance R is only applied when the phase is horizontally laid at 0.2m d Circulation value b and ground resistance R at the time of influence d The relation of (2), namely the fifth fitting formula corresponding to horizontal laying isIn the case of the right-angle laying, the corresponding fifth fitting formula isThe cable loop estimation formula may be further determined from the first fitting formula, the second fitting formula, and the fifth fitting formula.
The fitting formulas under different conditions can be combined by considering the conditions of different laying modes respectively, and the cable circulation estimation formula under each laying mode is finally determined. Specifically, in the case of a triangle laying mode, the cable circulation estimation formula may be y 400 ＝k 1 σ+k 2 a, wherein y 400 To obtain the estimated value of the cable circulation, k 1 Slope, k of curve of circulation and current unbalance degree sigma 2 Is the slope of the loop versus segment imbalance a. In the case of the horizontal laying mode, the influence of the current unbalance degree sigma is required to be considered, and in the case of the current unbalance degree sigma not being 0, fig. 8 is a schematic diagram showing the horizontal laying lower ground resistance R according to the alternative embodiment of the present invention d The effect relationship diagram of the relationship between the circulation and the current unbalance sigma is shown in fig. 8, corresponding circulation values under different grounding resistances and different current unbalance can be obtained, and the cable circulation estimation formula is obtained by substituting the cable circulation value obtained when the current unbalance is 1.98% into the circulation value through a point-inclined linear function representation method Wherein y is σ＝1.98 The magnitude of the cable loop current value is obtained when the current unbalance degree is 1.98%; in the case where the current unbalance σ is not 0, the cable loop current estimation formula is y 400 ＝k 2 a+b 1 . In the case of the right-angle laying, the cable loop current value y at a current imbalance of 1% is first determined, similarly to the horizontal laying σ＝1 The cable circulation estimation formula is obtained by using the point inclined linear function expression methodBut at a current imbalance sigma of not0, the cable loop estimation formula is y 400 ＝k 2 a+b 2 。
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
From the above description of the embodiments, it will be clear to a person skilled in the art that the current determination method according to the above embodiments may be implemented by means of software plus a necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
According to an embodiment of the present invention, there is also provided a current determining apparatus for implementing the above current determining method, and fig. 9 is a block diagram of a structure of the current determining apparatus provided according to an embodiment of the present invention, as shown in fig. 9, the current determining apparatus includes: the current determination means are described below by means of an acquisition module 92, a first determination module 94, a carry-in module 96 and a second determination module 99.
The obtaining module 92 is configured to obtain a target ground resistance value, a target three-phase load current imbalance, a target segment imbalance, and a laying manner of the target three-phase cable of the target cable cross-connect grounding circuit.
The first determining module 94 is connected to the obtaining module 92, and is configured to determine, according to a predetermined correspondence between a cable laying manner and a cable circulation estimation formula, that a cable circulation estimation formula corresponding to the laying manner of the target three-phase cable is a target cable circulation estimation formula, where the cable laying manner includes at least one of: horizontal laying, right angle laying and triangular laying.
The carry-in module 96 is connected to the first determining module 94, and is configured to carry the target ground resistance, the target three-phase load current imbalance, and the target segment imbalance into a target cable loop current estimation formula to obtain an estimated value of the target cable loop current.
A second determination module 99, coupled to the carry-in module 96, is configured to determine a cable loop current value for the target cable cross-connect ground loop based on the estimated value of the target cable loop current.
It should be noted that the above-mentioned obtaining module 92, the first determining module 94, the bringing-in module 96 and the second determining module 99 correspond to steps S202 to S208 in the embodiment, and the plurality of modules are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above-mentioned embodiment. It should be noted that the above-described module may be operated as a part of the apparatus in the computer terminal 10 provided in the embodiment.
Embodiments of the present invention may provide a computer device, optionally in this embodiment, the computer device may be located in at least one network device of a plurality of network devices of a computer network. The computer device includes a memory and a processor.
The memory may be used to store software programs and modules, such as program instructions/modules corresponding to the current determining method and apparatus in the embodiments of the present invention, and the processor executes the software programs and modules stored in the memory, thereby performing various functional applications and data processing, that is, implementing the current determining method described above. The memory 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 may further include memory remotely located relative to the processor, which may be connected to the computer terminal 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 processor may call the information and the application program stored in the memory through the transmission device to perform the following steps: acquiring a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of a target three-phase cable of a target cable cross-connection grounding circuit; according to the corresponding relation between the preset cable laying mode and the cable circulation estimation formula, determining the cable circulation estimation formula corresponding to the laying mode of the target three-phase cable as the target cable circulation estimation formula, wherein the cable laying mode comprises at least one of the following steps: horizontal laying, right angle laying and triangular laying; carrying the target ground resistance, the target three-phase load current unbalance and the target segment unbalance into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation; and determining the cable loop value of the target cable cross-connection ground loop according to the estimated value of the target cable loop.
Optionally, the above processor may further execute program code for: determining a cable loop current value of the target cable cross-connect ground loop based on the estimated value of the target cable loop current, comprising: obtaining a target three-phase load current average value of a target cable cross-connection grounding circuit; determining a three-phase load current average value corresponding to a target cable circulation estimation formula; determining the ratio of the target three-phase load current average value to the three-phase load current average value corresponding to the target cable loop current estimation formula; and determining the cable loop value of the target cable cross-connection ground loop according to the ratio and the estimated value of the target cable loop.
Optionally, the above processor may further execute program code for: the correspondence between the cable laying mode and the cable circulation estimation formula is determined by the following method: setting an experimental cable cross-connection grounding circuit laid in a cable laying mode; setting loop current influence parameters of the experimental cable cross-connection grounding circuit by using a plurality of groups of parameter values respectively, and determining experimental cable loop current values corresponding to the plurality of groups of parameter values respectively, wherein the loop current influence parameters comprise at least one of the following: ground resistance value, three-phase load current unbalance degree and segmentation unbalance degree; fitting according to experimental cable circulation values corresponding to the multiple groups of parameter values to obtain a cable circulation estimation formula; and determining that the cable laying mode corresponds to the cable circulation estimation formula to obtain a corresponding relation.
Optionally, the above processor may further execute program code for: under the condition that the circulation influence parameters comprise a ground resistance value, three-phase load current unbalance degree and segmentation unbalance degree, fitting to obtain a cable circulation estimation formula according to experimental cable circulation values respectively corresponding to a plurality of groups of parameter values, wherein the method comprises the following steps: fitting a correlation between the experimental cable loop current values and the imbalance degree of the three-phase load current according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula; fitting a correlation between the experimental cable loop current values and the sectional unbalance according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula; and determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula.
Optionally, the above processor may further execute program code for: determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula, comprising: fitting a correlation between the experimental cable loop current values and the imbalance degree of the three-phase load current by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula; fitting a correlation between the grounding resistance value and the slope of the first fitting formula by adopting an exponential function according to experimental cable loop current values respectively corresponding to a plurality of groups of parameter values to obtain a third fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the third fitting formula.
Optionally, the above processor may further execute program code for: determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula, further comprising: fitting a correlation between the experimental cable loop current values and the sectional unbalance degree by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula; fitting a correlation between the grounding resistance value and the slope of the second fitting formula by adopting an exponential function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fourth fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fourth fitting formula.
Optionally, the above processor may further execute program code for: determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula, further comprising: fitting a correlation between the experimental cable loop current values and the grounding resistance values by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fifth fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fifth fitting formula.
By adopting the embodiment of the invention, a scheme for determining the current is provided. The method comprises the steps of obtaining a target grounding resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of a target three-phase cable of a target cable cross-connection grounding circuit; according to the corresponding relation between the preset cable laying mode and the cable circulation estimation formula, determining the cable circulation estimation formula corresponding to the laying mode of the target three-phase cable as the target cable circulation estimation formula, wherein the cable laying mode comprises at least one of the following steps: horizontal laying, right angle laying and triangular laying; carrying the target ground resistance, the target three-phase load current unbalance and the target segment unbalance into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation; according to the estimated value of the target cable circulation, the cable circulation value of the target cable cross-connection ground loop is determined, the purpose that the cable circulation value is influenced by the cable laying mode, the grounding resistance, the three-phase current unbalance degree and the three-phase segmentation unbalance degree is achieved, the technical effect of obtaining the accurate cable circulation value is achieved, and the technical problem that the cable circulation value is inaccurate due to the fact that the cable laying mode, the grounding resistance, the three-phase current unbalance degree and the three-phase segmentation unbalance degree are influenced is solved.
Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program for instructing a terminal device to execute on associated hardware, the program may be stored in a non-volatile storage medium, and the storage medium may include: flash disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic or optical disk, and the like.
Embodiments of the present invention also provide a nonvolatile storage medium. Alternatively, in the present embodiment, the above-described nonvolatile storage medium may be used to store the program code executed by the current determination method provided in the above-described embodiment.
Alternatively, in this embodiment, the above-mentioned nonvolatile storage medium may be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the mobile terminals in the mobile terminal group.
Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: acquiring a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of a target three-phase cable of a target cable cross-connection grounding circuit; according to the corresponding relation between the preset cable laying mode and the cable circulation estimation formula, determining the cable circulation estimation formula corresponding to the laying mode of the target three-phase cable as the target cable circulation estimation formula, wherein the cable laying mode comprises at least one of the following steps: horizontal laying, right angle laying and triangular laying; carrying the target ground resistance, the target three-phase load current unbalance and the target segment unbalance into a target cable circulation estimation formula to obtain an estimated value of the target cable circulation; and determining the cable loop value of the target cable cross-connection ground loop according to the estimated value of the target cable loop.
Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: determining a cable loop current value of the target cable cross-connect ground loop based on the estimated value of the target cable loop current, comprising: obtaining a target three-phase load current average value of a target cable cross-connection grounding circuit; determining a three-phase load current average value corresponding to a target cable circulation estimation formula; determining the ratio of the target three-phase load current average value to the three-phase load current average value corresponding to the target cable loop current estimation formula; and determining the cable loop value of the target cable cross-connection ground loop according to the ratio and the estimated value of the target cable loop.
Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: the correspondence between the cable laying mode and the cable circulation estimation formula is determined by the following method: setting an experimental cable cross-connection grounding circuit laid in a cable laying mode; setting loop current influence parameters of the experimental cable cross-connection grounding circuit by using a plurality of groups of parameter values respectively, and determining experimental cable loop current values corresponding to the plurality of groups of parameter values respectively, wherein the loop current influence parameters comprise at least one of the following: ground resistance value, three-phase load current unbalance degree and segmentation unbalance degree; fitting according to experimental cable circulation values corresponding to the multiple groups of parameter values to obtain a cable circulation estimation formula; and determining that the cable laying mode corresponds to the cable circulation estimation formula to obtain a corresponding relation.
Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: under the condition that the circulation influence parameters comprise a ground resistance value, three-phase load current unbalance degree and segmentation unbalance degree, fitting to obtain a cable circulation estimation formula according to experimental cable circulation values respectively corresponding to a plurality of groups of parameter values, wherein the method comprises the following steps: fitting a correlation between the experimental cable loop current values and the imbalance degree of the three-phase load current according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula; fitting a correlation between the experimental cable loop current values and the sectional unbalance according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula; and determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula.
Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula, comprising: fitting a correlation between the experimental cable loop current values and the imbalance degree of the three-phase load current by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula; fitting a correlation between the grounding resistance value and the slope of the first fitting formula by adopting an exponential function according to experimental cable loop current values respectively corresponding to a plurality of groups of parameter values to obtain a third fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the third fitting formula.
Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula, further comprising: fitting a correlation between the experimental cable loop current values and the sectional unbalance degree by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula; fitting a correlation between the grounding resistance value and the slope of the second fitting formula by adopting an exponential function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fourth fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fourth fitting formula.
Optionally, in the present embodiment, the non-volatile storage medium is arranged to store program code for performing the steps of: determining a cable circulation estimation formula according to the first fitting formula and the second fitting formula, further comprising: fitting a correlation between the experimental cable loop current values and the grounding resistance values by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fifth fitting formula; and determining a cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fifth fitting formula.
The foregoing embodiment numbers of the present application 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 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 the embodiments of the present invention 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 non-volatile storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing 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 method according to the embodiments of the present invention. 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 invention 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 invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. A method of determining a current, comprising:
acquiring a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of a target three-phase cable of a target cable cross-connection grounding circuit;
according to a corresponding relation between a preset cable laying mode and a cable circulation estimation formula, determining the cable circulation estimation formula corresponding to the laying mode of the target three-phase cable as a target cable circulation estimation formula, wherein the cable laying mode comprises at least one of the following steps: horizontal laying, right angle laying and triangular laying;
the target ground resistance, the target three-phase load current unbalance and the target segment unbalance are brought into the target cable circulation estimation formula to obtain an estimated value of the target cable circulation;
and determining the cable loop current value of the target cable cross-connection ground loop according to the estimated value of the target cable loop current.
2. The method of claim 1, wherein determining the cable loop current value of the target cable cross-connect ground loop based on the estimated value of the target cable loop current comprises:
acquiring a target three-phase load current average value of the target cable cross interconnection grounding circuit;
determining a three-phase load current average value corresponding to the target cable circulation estimation formula;
determining the ratio of the target three-phase load current average value to the three-phase load current average value corresponding to the target cable circulation estimation formula;
and determining a cable loop current value of the target cable cross-connection ground loop according to the ratio and the estimated value of the target cable loop current.
3. The method according to claim 1, wherein the correspondence between the cabling scheme and the cable loop estimation formula is determined by:
setting an experimental cable cross-connection grounding circuit laid in the cable laying mode;
setting circulation influence parameters of the experimental cable cross-connection grounding circuit with a plurality of groups of parameter values respectively, and determining experimental cable circulation values corresponding to the plurality of groups of parameter values respectively, wherein the circulation influence parameters comprise at least one of the following: ground resistance value, three-phase load current unbalance degree and segmentation unbalance degree;
Fitting according to the experimental cable circulation current values respectively corresponding to the multiple groups of parameter values to obtain the cable circulation current estimation formula;
and determining that the cable laying mode corresponds to the cable circulation estimation formula, and obtaining the corresponding relation.
4. A method according to claim 3, wherein, in the case where the circulation affecting parameter includes a ground resistance value, a three-phase load current imbalance degree and a segment imbalance degree, the fitting to obtain the cable circulation estimation formula according to the experimental cable circulation values respectively corresponding to the plurality of sets of parameter values includes:
fitting a correlation between the experimental cable loop current values and the three-phase load current unbalance according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula;
fitting a correlation between the experimental cable loop current values and the sectional unbalance according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula;
and determining the cable circulation estimation formula according to the first fitting formula and the second fitting formula.
5. The method of claim 4, wherein said determining said cable loop estimation formula from said first fitting formula and said second fitting formula comprises:
Fitting a correlation between the experimental cable loop current values and the three-phase load current unbalance degree by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a first fitting formula;
fitting a correlation between the grounding resistance value and the slope of the first fitting formula by adopting an exponential function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a third fitting formula;
and determining the cable circulation estimation formula according to the first fitting formula, the second fitting formula and the third fitting formula.
6. The method of claim 4, wherein said determining said cable loop estimation formula from said first fitting formula and said second fitting formula further comprises:
fitting a correlation between the experimental cable loop current values and the sectional unbalance degree by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a second fitting formula;
fitting a correlation between the grounding resistance value and the slope of the second fitting formula by adopting an exponential function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fourth fitting formula;
And determining the cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fourth fitting formula.
7. The method of claim 4, wherein said determining said cable loop estimation formula from said first fitting formula and said second fitting formula further comprises:
fitting a correlation between the experimental cable loop current values and the grounding resistance values by adopting a primary function according to the experimental cable loop current values respectively corresponding to the multiple groups of parameter values to obtain a fifth fitting formula;
and determining the cable circulation estimation formula according to the first fitting formula, the second fitting formula and the fifth fitting formula.
8. A current determining apparatus, comprising:
the acquisition module is used for acquiring a target ground resistance value, a target three-phase load current unbalance degree, a target segmentation unbalance degree and a laying mode of the target three-phase cable of the target cable cross-connection grounding circuit;
the first determining module is configured to determine, according to a predetermined correspondence between a cable laying manner and a cable circulation estimation formula, that a cable circulation estimation formula corresponding to the cable circulation estimation formula of the target three-phase cable is a target cable circulation estimation formula, where the cable laying manner includes at least one of: horizontal laying, right angle laying and triangular laying;
The substituting module is used for substituting the target ground resistance value, the target three-phase load current unbalance degree and the target segmentation unbalance degree into the target cable circulation estimation formula to obtain an estimated value of the target cable circulation;
and the second determining module is used for determining the cable circulation value of the target cable cross-connection ground loop according to the estimated value of the target cable circulation.
9. A non-volatile storage medium, characterized in that the non-volatile storage medium comprises a stored program, wherein the program, when run, controls a device in which the non-volatile storage medium is located to perform the current determination method of any one of claims 1 to 7.
10. A computer device, comprising: a memory and a processor, wherein the memory is configured to store,
the memory stores a computer program;
the processor being configured to execute a computer program stored in the memory, the computer program when run causing the processor to perform the current determination method of any one of claims 1 to 7.
CN202311069589.6A 2023-08-24 2023-08-24 Current determination method, apparatus, nonvolatile storage medium, and computer device Pending CN117214501A (en)

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