CN108009312B - Conductor configuration method and system for reducing surface electric field of high-voltage direct-current split conductor - Google Patents
Conductor configuration method and system for reducing surface electric field of high-voltage direct-current split conductor Download PDFInfo
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Abstract
The invention discloses a conductor configuration method for reducing a surface electric field of a high-voltage direct-current split conductor, which comprises the following steps: determining the number of sub-conductors in the high-voltage direct-current split conductor and the arrangement mode of the sub-conductors; selecting the sub-conductor with the maximum surface field intensity in the split conductors and the sub-conductor symmetrical to the sub-conductor as sub-conductors with larger cross sections; presetting the base radius of the sub-conductors with the larger cross sections, and gradually increasing the base radius to obtain the radii of the sub-conductors with the larger cross sections; establishing a physical model of a corresponding bipolar lead simulation line according to the radiuses of the sub-leads with the large cross sections; calculating the maximum value and the minimum value of the maximum surface field intensity of the neutron conductor in the bundle conductor according to the physical model; and calculating the ratio of the maximum value to the minimum value of the maximum surface field intensity in the split conductor, wherein the radius of the sub-conductor with the larger section corresponding to the minimum ratio is used as the radius of the sub-conductor with the larger section configured in the sub-conductor.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current transmission lines, in particular to a conductor configuration method and a conductor configuration system for reducing a surface electric field of a high-voltage direct-current split conductor.
Background
In order to meet the requirement of long-distance large-capacity power transmission in China, a national grid company researches and builds a plurality of +/-800 kV extra-high voltage direct current transmission projects such as a home dam, shanghai, a brocade screen, sunan, hami-Zheng state and the like, weak corona generally exists on the surface of a split conductor in high-voltage direct current transmission, audible noise, radio interference, a synthesized electric field, ion flow and the like can be generated when corona discharge occurs, and adverse effects are caused on the surrounding environment, so that higher technical requirements on corona effect control are provided for the improvement of the transmission voltage level. The most important factor influencing the corona discharge of the wire is the surface field intensity of the wire, and the high-voltage direct-current transmission generally adopts a split wire to reduce the surface field intensity of the wire. The corona loss is the energy loss generated by the conductor in the corona discharge process, and the research on the surface field intensity of the conductor of the transmission line is of great significance to the improvement of the conductor configuration of the ultra-high voltage transmission line at present in the resource-saving society of construction.
In the prior art, each sub-conductor of a conventional high-voltage direct-current transmission conductor is of the same type and the same section, the distances among the sub-conductors are equal, the spatial positions of the sub-conductors are different, so that the ground capacitance and the capacitance among the conductors are different, and the mutual action among the sub-conductors causes that the surface field intensity of each sub-conductor is different and is unevenly distributed, the surface field intensity of the sub-conductor which is closer to the other pole conductor and is at a lower position is the largest, and the surface field intensity of other sub-conductors is smaller; the surface field intensity distribution of each sub-conductor is not uniform. At present, the composite electric field, the radio interference and the audible noise level of the high-voltage direct-current circuit are reduced by reducing the surface field intensity of the conductor by increasing the number of the split conductors and increasing the sections of all sub-conductors at home and abroad. In the prior art, in some areas which can meet the environmental protection requirement without adopting large wires, the wire configuration method improves the material cost for arranging the split wires due to the use of the sub-wires with large sections, has higher requirement on the bearing capacity of the line tower, and simultaneously does not solve the problem of uneven surface field intensity distribution of the sub-wires.
Therefore, a technology is needed to reduce the material cost of the sub-conductor with a large cross section and solve the problem of uneven surface field intensity distribution of the sub-conductor through the configuration of the sub-conductor in the high-voltage direct-current split conductor.
Disclosure of Invention
The application provides a conductor configuration method for reducing a surface electric field of a high-voltage direct-current split conductor, and aims to solve the problem of how to configure a neutron conductor in the high-voltage direct-current split conductor.
In order to solve the above problems, the present invention provides a conductor configuration method for a surface electric field of a low-voltage high-voltage direct-current split conductor, the method comprising:
determining the number of sub-conductors in the high-voltage direct-current split conductor and the arrangement mode of the sub-conductors;
selecting the sub-conductor with the maximum surface field intensity in the split conductors and the sub-conductor symmetrical to the sub-conductor as sub-conductors with larger cross sections;
presetting the base radius of the sub-conductors with the larger cross sections, and gradually increasing the base radius to obtain the radii of the sub-conductors with the larger cross sections;
establishing a physical model of the corresponding bipolar lead simulation line according to the radiuses of the sub-leads with the larger sections;
calculating the maximum value and the minimum value of the maximum surface field intensity of the neutron conductor in the bundle conductor according to the physical model;
and calculating the ratio of the maximum value to the minimum value of the maximum surface field intensity of the sub-conductor in the bundle conductor, wherein the radius of the sub-conductor with the larger section corresponding to the minimum ratio is used as the radius of the sub-conductor with the larger section configured in the sub-conductor.
Preferably, some of the sub-wires are sub-wires with larger cross sections, and the sub-wires with larger cross sections are arranged in a symmetrical manner.
Preferably, the method for calculating the maximum surface field strength and the minimum surface field strength of each sub-wire comprises: successive mirror method, finite element method or analog charge method, approximation formula method.
Preferably, when the number of the sub-wires in the split conductor is 8, the sub-wire with the maximum surface field intensity of the positive electrode and the sub-wire with the maximum surface field intensity of the negative electrode in the sub-wires are used as the sub-wires with larger cross sections.
Preferably, when the number of sub-conductors in the split conductor is 8, the radius of the sub-conductor of the larger cross section is 1.02 times the radius of the sub-conductor of the non-larger cross section.
Preferably, the ratio of the radius of the sub-conductors of larger cross section to the radius of the sub-conductors of non-larger cross section is not more than 1.1.
According to another aspect of the present invention, there is provided a conductor configuration system for reducing a surface electric field of a high voltage dc split conductor, the system comprising:
the arrangement unit is used for determining the number of sub-conductors in the high-voltage direct-current split conductor and the arrangement mode of the sub-conductors;
the selection unit is used for selecting the sub-wire with the maximum surface field intensity and the sub-wire symmetrical to the sub-wire in the split wire as the sub-wires with larger cross sections;
the presetting unit is used for presetting the basic radius of the sub-conductors with larger cross sections, gradually increasing the basic radius and obtaining the radii of the sub-conductors with the larger cross sections;
the establishing unit is used for establishing a physical model of the corresponding bipolar lead simulation line according to the radiuses of the sub-leads with the larger sections;
the first calculating unit is used for calculating the maximum value and the minimum value of the maximum surface field intensity of the sub-conductor in the split conductor according to the physical model;
and the second calculating unit is used for calculating the ratio of the maximum value to the minimum value of the maximum surface field intensity of the sub-conductor in the split conductor, and the radius of the sub-conductor with the larger cross section corresponding to the minimum value is used as the larger cross section of the radius of the sub-conductor with the larger cross section configured in the sub-conductor.
Preferably, some of the sub-wires in the sub-wires are sub-wires with a larger cross section, and the sub-wires with the larger cross section are arranged in a symmetrical manner.
Preferably, the first calculating unit is further configured to calculate the maximum surface field strength and the minimum surface field strength of each sub-wire by the method including: successive mirror method, finite element method or analog charge method, approximate formula method.
Preferably, the arranging unit is further configured to, when the number of the sub-wires in the split conductor is 8, use the sub-wire with the largest positive surface field intensity and the sub-wire with the largest negative surface field intensity as the sub-wires with larger cross sections.
Preferably, the preset unit is further configured to, when the number of sub-wires in the split conductor is 8, make the radius of the sub-wire with the larger cross section 1.02 times the radius of the sub-wire with the non-larger cross section.
Preferably, the preset unit is further used for enabling the radius ratio of the sub-wires with larger cross sections to the radius ratio of the sub-wires with non-larger cross sections to be not more than 1.1.
The technical scheme of the invention provides a conductor configuration method for reducing the surface electric field of a high-voltage direct-current split conductor, and the technical scheme of the invention optimizes the surface field intensity of the split conductor by locally adopting sub-conductors with larger cross sections, compared with the conventional equal-cross-section split conductor, the method can reduce the material cost under the same condition, simultaneously reduce the corona discharge degree of a power transmission conductor, and optimize the balance of the surface field intensity of each sub-conductor, thereby optimizing the electromagnetic environment around the line and providing the configuration parameters of the split conductor for the line design of a high-voltage direct-current line.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow chart of a conductor configuration method for reducing the surface electric field of a high voltage DC split conductor according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of an arrangement of split conductors with a split conductor sub-conductor number of 8 according to an embodiment of the invention;
fig. 3 is a schematic diagram showing a functional relationship between a ratio of a maximum value to a minimum value of the maximum surface field intensity of each sub-conductor and a ratio of a major axis to a minor axis of the split conductor when the number of the sub-conductors of the split conductor is 8 and a base radius of the sub-conductor of a larger cross section in the split conductor is 18.1mm according to the embodiment of the present invention;
fig. 4 is a surface field intensity contrast distribution diagram of each sub-conductor in the split conductor when the number of the sub-conductors of the split conductor is 8 and the basic radius of the sub-conductor with a large cross section in the split conductor is 18.1mm according to the embodiment of the invention; and
fig. 5 is a diagram of a conductor configuration system for reducing the surface electric field of a high voltage dc split conductor according to an embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their context in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a conductor configuration method for reducing a surface electric field of a high voltage dc split conductor according to an embodiment of the invention. The embodiment of the invention provides a conductor configuration method for reducing the surface electric field of a high-voltage direct-current split conductor, and sub-conductors in the conductor configuration method are divided into sub-conductors with larger cross sections and sub-conductors with non-larger cross sections. In the application, the partial sub-wires adopt sub-wires with larger cross sections, and the other part adopts sub-wires with non-larger cross sections. Embodiments of the present invention optimize the surface field strength of a split conductor by locally employing sub-conductors of larger cross-section. As shown in fig. 1, a conductor configuration method 100 for reducing the surface electric field of a high voltage dc split conductor begins with step 101:
preferably, in step 101: and determining the number of the sub-conductors in the high-voltage direct-current split conductor and the arrangement mode of the sub-conductors.
Preferably, the arrangement pitches of the sub-conductors in the split conductor are equal.
Preferably, at step 102: the sub-conductor with the highest surface field intensity and the sub-conductor symmetrical to the sub-conductor in the split conductor are selected as the sub-conductors with larger cross sections. According to the integral balance of the overhead split conductor, the positions of the maximum surface field intensity of the sub-conductors are mainly distributed on the sub-conductors at two ends and close to the ground and one side of the negative conductor, and the sub-conductors with larger cross sections are mainly used on the sub-conductor with the maximum surface field intensity and the sub-conductor symmetrical to the sub-conductor or the sub-conductor at the bottommost part.
Preferably, when the number of the sub-conductors in the split conductor is 8, the two sub-conductors with the maximum field intensity on the surface of the positive electrode and the two sub-conductors with the maximum field intensity on the surface of the negative electrode in the sub-conductors are taken as the sub-conductors with larger cross sections. In the application, when the probability of the sub-wires in the split conductor is 8, 4 sub-wires in total, which are the two wires with the maximum surface field intensity of the positive electrode and are symmetrical with the two wires, and 4 wires with the symmetrical negative electrode and the two wires are selected from the 8 sub-wires as the sub-wires with larger cross section.
According to the integral balance of the overhead split conductor, the positions of the maximum surface field intensity of the sub-conductors are mainly distributed on the sub-conductors at two ends and close to the ground and one side of the negative conductor, and the sub-conductors with larger cross sections are mainly used on the two sub-conductors with the maximum surface field intensity and the two sub-conductors symmetrical to the two sub-conductors.
Preferably, when the number of sub-conductors in a split conductor is 8, the radius of a sub-conductor of a larger cross-section is 1.02 times the radius of a sub-conductor of a non-larger cross-section.
Preferably, the wire at 1.02 times radius is not a national standard wire, and a standard series wire can be selected nearby.
In this application, when the wire radius is 18.1mm (sub-wire cross-sectional area is 720 mm) 2 ) When the number of the sub-conductors of the split conductor is 8, the optimal theoretical value of the radius of the local large conductor is as follows: 18.4mm, the radius of the local large lead is increased by 2 percent;
in this application, a wire radius of 19.2mm (sub-wire cross-sectional area of 800 mm) is used 2 ) For the basic conductor, when the number of the sub-conductors of the split conductor is 8, the optimal theoretical value of the radius of the sub-conductor with a local larger section is as follows: 19.5mm, the radius of the sub-conductor with a local larger section is increased by 2 percent;
in this application, when a wire with a radius of 20.3mm (cross-sectional area of sub-wire 900 mm) is used 2 ) For the basic conductor, when the number of the sub-conductors of the split conductor is 8, the optimal theoretical value of the radius of the sub-conductor with a local larger section is as follows: 20.6mm, the radius of the local large lead is increased by 1.4 percent;
in this application, the radius of the conductor used is 21.05mm (the cross-sectional area of the sub-conductor is 1000 mm) 2 ) For the basic conductor, when the number of the sub-conductors of the split conductor is 8, the optimal theoretical value of the radius of the sub-conductor with a local larger section is as follows: 21.3mm, the radius of the sub-conductor with a local larger section is increased by 1.17%;
preferably, the ratio of the radius of the sub-conductors of larger cross-section to the radius of the sub-conductors of non-larger cross-section is not more than 1.1 times. In the application, when the sub-conductor with the larger cross section is locally adopted by the high-voltage direct-current split conductor, the radius of the sub-conductor with the locally larger cross section can be increased by a certain proportion in the engineering.
Preferably, some of the sub-wires are sub-wires with larger cross-section, and the sub-wires with larger cross-section are arranged in a symmetrical manner. In the present application, according to different arrangement modes of the sub-conductors, for example, only 1 conductor is arranged at the bottommost part in the arrangement mode of the single-pole conductors, and the number of the single-polarity medium-large cross-section conductors can be 1. Because the high-voltage direct-current transmission line is divided into positive and negative poles, the number of the positive and negative poles is generally even.
In the present application, sub-conductors of locally larger cross-section are partially employed and symmetrically used in the high voltage direct current transmission line.
Preferably, in step 103: presetting the base radius of the sub-wires with larger sections, and gradually increasing the base radius to obtain the radii of the sub-wires with the larger sections.
According to the method, the radius of a lead with one section type is taken as a basic radius, the radius of sub-leads with local larger sections is gradually increased, and corresponding physical models of the bipolar lead simulation circuit are respectively established according to the radius of the sub-leads with different local larger sections.
Preferably, the increments of radius for sub-conductors of locally larger cross-section are equally or unequally spaced.
Preferably, at step 104: and establishing a physical model of the corresponding bipolar lead simulation line according to the radiuses of the sub-leads with the larger sections.
Preferably, at step 105: and calculating the maximum value and the minimum value of the maximum surface field intensity of the sub-conductor in the split conductor according to the physical model.
In this application, the method for calculating the maximum surface field strength of each sub-wire includes: successive mirror method, finite element method, analog charge method, approximation formula method, etc. In the application, the maximum surface field strengths of the sub-conductors in the split conductors are calculated, the maximum surface field strengths of the sub-conductors are sorted, and the maximum value and the minimum value of the maximum field strengths of the sub-conductors are selected.
Preferably, at step 106: and calculating the ratio of the maximum value to the minimum value of the maximum surface field intensity of the sub-conductor in the split conductor, wherein the radius of the sub-conductor with a larger section corresponding to the minimum ratio is used as the radius of the sub-conductor with the larger section configured in the sub-conductor.
In the application, the maximum surface field intensity of each sub-wire under each physical model is contrastively analyzed, the ratio of the maximum value to the minimum value of the maximum surface field intensity of each sub-wire is calculated, and when the ratio is minimum, the theoretical optimal time of the sub-wire with a local larger section is adopted in the physical model. The radius value of the sub-lead with the theoretical local larger section is compared with the diameter of the lead used in actual engineering, and the actual lead closest to the theoretical optimal value is the optimal lead adopting the sub-lead with the local larger section.
Fig. 2 is a schematic cross-sectional view of a split conductor configuration with 8 split conductor sub-conductors according to an embodiment of the invention, as shown in fig. 2, the sub-conductors of larger cross-section are mainly used in the bottom two sub-conductors. The radii and the model are uniform for the remaining non-larger cross-section sub-conductors, except for the larger cross-section sub-conductor.
Fig. 3 is a diagram illustrating the relationship between the ratio of the maximum value and the minimum value of the maximum surface field intensity of each sub-conductor and the ratio of the major axis to the minor axis of the split conductor when the number of the sub-conductors of the split conductor is 8 and the base radius of the sub-conductor with a larger cross section in the split conductor is 18.1mm according to the embodiment of the invention. As shown in FIG. 3, when using a wire with a radius of 18.1mm (sub-wire cross-sectional area of 720 mm) 2 ) The split conductor is a basic conductor, and when the number of the sub-conductors of the split conductor is 8, a functional relation graph between the ratio of the maximum value to the minimum value of the maximum surface field intensity of each sub-conductor and the ratio of the long axis to the short axis of the split conductor is formed. The abscissa of the functional relation graph in fig. 3 is the value of the radius of the local large conductor, and the ordinate of the functional relation graph is the ratio of the maximum value and the minimum value of the maximum surface field intensity of each sub-conductor. As shown in fig. 3, as the ratio of the major axis to the minor axis of the abscissa gradually increases, the ratio of the ordinate gradually decreases, then increases gradually, and finally increases greatly, and when the radius of the sub-conductor with a locally larger cross section is 18.9mm, the ratio of the maximum value to the minimum value of the maximum surface field strength is the minimum value, that is, the optimal configuration method is obtained at this time. Wherein, the surface field intensity of the sub-lead refers to the maximum value of the surface field intensity of the single sub-lead.
Fig. 4 is a graph showing the contrast of the surface field intensity of each sub-conductor in the split conductor when the number of the sub-conductors of the split conductor is 8 and the base radius of the sub-conductor with a larger cross section in the split conductor is 18.1mm according to the embodiment of the invention. As shown in FIG. 4, when using a wire with a radius of 18.1mm (sub-wire cross-sectional area of 720 mm) 2 ) The split conductor is a basic conductor, and when the number of the split conductor sub-conductors is 8, the surface field intensity of each sub-conductor of the split conductor is distributed in a contrast manner; each of the two kinds of lower model with different wire radiusesThe wire surface field strength versus data is shown in fig. 4.
Fig. 5 is a diagram of a conductor configuration system for reducing the surface electric field of a high voltage dc split conductor according to an embodiment of the invention. As shown in fig. 5, a conductor configuration system 500 for reducing the surface electric field of a high voltage dc split conductor comprises:
the arranging unit 501 determines the number of sub-conductors in the high-voltage direct-current split conductor and the arrangement mode of the sub-conductors.
Preferably, the arranging unit 501 is further configured to arrange the sub-conductors in the split conductor at equal intervals.
Preferably, the arranging unit 501 is further configured to, when the number of the sub-conductors in the split conductor is 8, use the sub-conductor with the largest positive surface field strength and the sub-conductor with the largest negative surface field strength as the sub-conductors with larger cross sections.
A selecting unit 502 for selecting the sub-conductor with the largest surface field strength and the sub-conductor symmetrical to the sub-conductor in the split conductor as the sub-conductor with larger cross section.
Preferably, some of the sub-wires are sub-wires with larger cross-section, and the sub-wires with larger cross-section are arranged in a symmetrical manner.
The presetting unit 503 is configured to preset a base radius of the sub-wires with larger cross sections, and gradually increase the base radius to obtain the radii of the sub-wires with larger cross sections.
Preferably, the presetting unit 503 is also used for, when the number of sub-conductors in the split conductor is 8, the radius of the sub-conductor of the larger cross section is 1.02 times the radius of the sub-conductor of the non-larger cross section.
Preferably, the presetting unit 503 is also used for setting the ratio of the radius of the sub-wires with larger cross section to the radius of the sub-wires with non-larger cross section to be not more than 1.1 times.
The establishing unit 504 is configured to establish a physical model of the corresponding bipolar lead simulation line according to the radii of the sub-leads with the larger cross-sections.
And the first calculating unit 505 is used for calculating the maximum value and the minimum value of the maximum surface field intensity of the sub-conductor in the bundle conductor according to a physical model.
Preferably, the first calculating unit 505 is further configured to calculate the maximum surface field strength of each sub-wire by a method comprising: successive mirror method, finite element method or analog charge method, approximate formula method.
The second calculating unit 506 is configured to calculate a ratio of a maximum value to a minimum value of a maximum surface field intensity of the sub-wire in the bundled conductor, where a radius of the sub-wire with a larger cross section is corresponding to the minimum ratio, and the radius of the sub-wire with the larger cross section is used as a radius of the sub-wire with the larger cross section configured in the sub-wire.
The wire configuration system 500 for reducing the surface electric field of the high-voltage direct-current split wire according to the embodiment of the present invention corresponds to the wire configuration method 100 for reducing the surface electric field of the high-voltage direct-current split wire according to the embodiment of the present invention, and will not be described herein again.
According to the embodiment of the invention, the sub-conductors with large cross sections are locally adopted to optimize the surface field intensity of the split conductors, so that compared with the conventional equal-cross-section split conductors, the material cost can be reduced under the same condition, the corona discharge degree of the power transmission conductors can be reduced, and the balance of the surface field intensity of each sub-conductor is optimized, so that the electromagnetic environment around the line can be optimized, and the configuration parameters of the split conductors are provided for the line design of the high-voltage direct-current line.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ means, component, etc ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (6)
1. A method of configuring a conductor to reduce a surface electric field of a high voltage dc split conductor, the method comprising:
determining the number of sub-conductors in the round high-voltage direct-current split conductor and the arrangement mode of the sub-conductors;
selecting the sub-conductor with the maximum surface field intensity in the split conductors and the sub-conductor symmetrical to the sub-conductor as sub-conductors with larger cross sections; part of the sub-conductors in the sub-conductors are sub-conductors with larger cross sections, and the sub-conductors with larger cross sections are arranged in a symmetrical mode;
presetting the base radius of the sub-conductors with the larger cross sections, and gradually increasing the base radius to obtain the radii of the sub-conductors with the larger cross sections; the radius ratio of the sub-wires with larger sections to the sub-wires with non-larger sections is not more than 1.1;
establishing a physical model of the corresponding bipolar lead simulation line according to the radiuses of the sub-leads with the larger sections;
calculating the maximum value and the minimum value of the maximum surface field intensity of the neutron conductor in the bundle conductor according to the physical model; the method for calculating the maximum surface field intensity of each sub-conductor comprises the following steps: successive mirror image method, finite element method, analog charge method, approximate formula method;
and calculating the ratio of the maximum value to the minimum value of the maximum surface field intensity of the sub-conductor in the bundle conductor, wherein the radius of the sub-conductor with the larger section corresponding to the minimum ratio is used as the radius of the sub-conductor with the larger section configured in the sub-conductor.
2. The method as claimed in claim 1, when the number of the sub-wires in the split conductor is 8, the sub-wires with the maximum surface field intensity of the positive electrode and the sub-wires symmetrical to the sub-wires with the maximum surface field intensity of the negative electrode are used as the sub-wires with larger cross section.
3. The method of claim 1 wherein when the number of sub-conductors in the split conductor is 8, the radius of the sub-conductors of greater cross section is 1.02 times the radius of the sub-conductors of non-greater cross section.
4. A conductor configuration system for reducing a surface electric field of a high voltage dc split conductor, the system comprising:
the arrangement unit is used for determining the number of sub-conductors in the round high-voltage direct-current split conductor and the arrangement mode of the sub-conductors;
the selection unit is used for selecting the sub-wire with the maximum surface field intensity and the sub-wire symmetrical to the sub-wire in the split wire as the sub-wires with larger cross sections; part of the sub-conductors in the sub-conductors are sub-conductors with larger cross sections, and the sub-conductors with larger cross sections are symmetrically distributed;
the presetting unit is used for presetting the basic radius of the sub-conductors with larger cross sections, gradually increasing the basic radius and obtaining the radii of the sub-conductors with the larger cross sections; the ratio of the radius of the sub-wires with larger sections to the radius of the sub-wires with non-larger sections is not more than 1.1;
the establishing unit is used for establishing a physical model of the corresponding bipolar lead simulation circuit according to the radiuses of the sub-leads with the larger sections;
the first calculating unit is used for calculating the maximum value and the minimum value of the maximum surface field intensity of the sub-conductor in the split conductor according to the physical model; the method for calculating the maximum surface field intensity of each sub-conductor comprises the following steps: successive mirror image method, finite element method, analog charge method, approximation formula method;
and the second calculating unit is used for calculating the ratio of the maximum value to the minimum value of the maximum surface field intensity of the sub-conductor in the bundled conductor, and the radius of the sub-conductor with the larger section corresponding to the minimum ratio is used as the section with the larger radius and the larger section of the sub-conductor with the larger section configured in the sub-conductor.
5. The system of claim 4, wherein the arrangement unit is further configured to, when the number of the sub-conductors in the split conductor is 8, use the sub-conductor with the largest field intensity on the surface of the positive electrode and the sub-conductor symmetrical thereto, and the sub-conductor with the largest field intensity on the surface of the negative electrode and the sub-conductor symmetrical thereto as the sub-conductors with larger cross sections.
6. The system of claim 4, said preset unit further configured such that, when the number of sub-conductors in said split conductor is 8, the radius of said sub-conductor of larger cross-section is 1.02 times the radius of a sub-conductor of non-larger cross-section.
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