CN112803344A - Lightning protection configuration method for newly-built power distribution network - Google Patents
Lightning protection configuration method for newly-built power distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/20—Active discharge triggering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/80—Discharge by conduction or dissipation, e.g. rods, arresters, spark gaps
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Abstract
本发明公开了一种新建配电网的雷电防护配置方法，通过确定所述新建配电网中每一配电线路所处区域的雷区等级和配电网设备重要程度等级；根据所述配电线路所处区域的雷区等级和配电网设备重要程度等级，确定所述配电线路的雷电防护等级；根据所述配电线路的雷电防护等级，为所述新建配电网的每一配电线路配置相应的雷电防护措施。采用本发明实施例，能有效提高新建配电网的雷电防护措施的有效性和针对性，提高防雷工作的效率和经济效益。
The invention discloses a lightning protection configuration method for a newly built distribution network. By determining the minefield level and the importance level of distribution network equipment in the area where each distribution line in the newly built distribution network is located; The minefield level of the area where the electrical line is located and the importance level of the distribution network equipment determine the lightning protection level of the distribution line; The distribution line is equipped with corresponding lightning protection measures. By adopting the embodiments of the present invention, the effectiveness and pertinence of the lightning protection measures for the newly built distribution network can be effectively improved, and the efficiency and economic benefit of lightning protection work can be improved.
Description
Technical Field
The invention relates to the technical field of lightning protection of power systems, in particular to a lightning protection configuration method of a newly-built power distribution network.
Background
With the development of the economy of China towards high-quality targets, the reliability of power supply of people is more and more required. Distribution lines, due to their own attributes: the insulation level is low, the distribution is wide and complex, and lightning trip faults are easy to occur. In addition, the distribution lines can be dozens of kilometers long, and the environmental conditions of the positions of all the line sections are different, such as the heights and densities of trees and buildings, so that the lightning stroke risks are different.
After the power distribution network system is newly built, lightning protection configuration is correspondingly carried out. Although the lightning stroke failure rate of the distribution network system is high, the lightning protection of the distribution network system does not pay enough attention for a long time, and the lightning protection measures of the distribution network system lack effectiveness and pertinence. The existing lightning protection measures do not treat the whole line differently, so that resource waste is caused in places where the lightning protection measures are not needed, and the economic investment is large; in some distribution lines and sections with high lightning stroke rate, the lightning protection effect is not obvious because the lightning protection measures are not sufficiently input.
Disclosure of Invention
The embodiment of the invention aims to provide a lightning protection configuration method for a newly-built power distribution network, which can effectively improve the effectiveness and pertinence of lightning protection measures of the newly-built power distribution network and improve the efficiency and economic benefits of lightning protection work.
In order to achieve the above object, an embodiment of the present invention provides a lightning protection configuration method for a newly-built power distribution network, including:
determining the grade of a lightning area of an area where each distribution line in the newly-built distribution network is located and the grade of the importance degree of the distribution network equipment;
determining the lightning protection level of the distribution line according to the lightning area level of the area where the distribution line is located and the importance level of the distribution network equipment;
and configuring corresponding lightning protection measures for each distribution line of the newly-built distribution network according to the lightning protection grade of the distribution line.
As an improvement of the above scheme, the determining the thunder area level of the area where each distribution line in the newly-built distribution network is located and the importance level of the distribution network equipment specifically includes:
acquiring historical meteorological statistical data of an area where each distribution line in the newly-built power distribution network is located; wherein the historical meteorological statistical data comprises the density of the terrestrial lightning and the annual thunderstorm day;
determining the thunder area grade of the area where the distribution line is located according to historical meteorological statistical data of the area where the distribution line is located;
and determining the importance degree grade of the power distribution network equipment according to the power supply object, the power failure influence range and the network node position of the power distribution network equipment.
As an improvement of the above scheme, the thunder zone grades include a few thunder zone grade, a medium thunder zone grade, a many thunder zone grade and a strong thunder zone grade; the importance degree grades of the power distribution network equipment comprise key equipment grades, important equipment grades and general equipment grades.
As an improvement of the scheme, the lightning protection grade is divided into a primary protection grade, a secondary protection grade and a tertiary protection grade in advance; wherein the primary protection level is higher than the secondary protection level, which is higher than the tertiary protection level.
As an improvement of the above scheme, determining the lightning protection level of the distribution line according to the lightning area level of the area where the distribution line is located and the importance level of the distribution network equipment specifically includes:
when the importance degree grade of the power distribution network equipment in the area of the power distribution line is a key equipment grade or an important equipment grade, and the thunder area grade is a strong thunder area grade or a multi-thunder area grade, determining the lightning protection grade of the power distribution line as a first-grade protection grade;
when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a key equipment grade or an important equipment grade, and the thunder area grade is a medium thunder area grade, determining that the lightning protection grade of the power distribution line is a secondary protection grade;
and when the importance degree grade of the power distribution network equipment in the area of the power distribution line is a key equipment grade or an important equipment grade, and the lightning protection grade of the power distribution line is determined to be a three-grade protection grade when the lightning area grade is a few-lightning area grade.
As an improvement of the above scheme, determining the lightning protection level of the distribution line according to the lightning area level of the area where the distribution line is located and the importance level of the distribution network equipment specifically includes:
when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a general equipment grade, and the lightning area grade is a strong lightning area grade or a multi-lightning area grade, determining that the lightning protection grade of the power distribution line is a secondary protection grade;
and when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a general equipment grade, and the lightning area grade is a medium lightning area grade or a low lightning area grade, determining that the lightning protection grade of the power distribution line is a three-grade protection grade.
As an improvement of the above scheme, configuring, according to the lightning protection grades of the distribution lines, corresponding lightning protection measures for each distribution line of the newly-built distribution network, specifically including:
when the lightning protection grade of the distribution line is a primary protection grade, the lightning protection measures configured for the distribution line comprise: the method comprises the following steps of (1) carrying out all-line reinforced insulation configuration and lightning protection breakage measures on the distribution line, configuring lightning arresters and overhead ground wires on a main line, important branch lines and vulnerable road sections, installing the lightning arresters at two ends of a cable, and installing the lightning arresters at two ends of a distribution transformer; wherein the vulnerable road segment represents a line segment that is vulnerable to lightning strikes.
As an improvement of the above scheme, configuring, according to the lightning protection grades of the distribution lines, corresponding lightning protection measures for each distribution line of the newly-built distribution network, specifically including:
when the lightning protection grade of the distribution line is a secondary protection grade, the lightning protection measures configured for the distribution line comprise: reinforcing insulation configuration and lightning protection breakage measures for the easy-hit road section of the distribution line, configuring lightning arresters and overhead ground wires for the main line, the important branch line and the easy-hit road section, installing the lightning arresters at two ends of the cable, and installing the lightning arresters at two ends of the distribution transformer; wherein the vulnerable road segment represents a line segment that is vulnerable to lightning strikes.
As an improvement of the above scheme, configuring, according to the lightning protection grades of the distribution lines, corresponding lightning protection measures for each distribution line of the newly-built distribution network, specifically including:
when the lightning protection grade of the distribution line is a three-grade protection grade, the lightning protection measures configured for the distribution line comprise: reinforcing insulation configuration and lightning protection broken line measures for the easy-to-hit road section of the distribution line; wherein the vulnerable road segment represents a line segment that is vulnerable to lightning strikes.
As an improvement of the above scheme, the vulnerable road section is a line section passing through a mountain depression, a windward slope, a mountain top, a river, a lake, a reservoir, a paddy field or an open area of a metal ore body; or the easy-hit road section is a line section adjacent to the high-voltage transmission line, the communication iron tower, the lightning arrester or the isolated high-protrusion object.
Compared with the prior art, the lightning protection configuration method of the newly-built power distribution network disclosed by the invention is characterized in that the grade of a lightning area of an area where each distribution line is located in the newly-built power distribution network and the grade of the importance degree of equipment of the power distribution network are determined; determining the lightning protection level of the distribution line according to the lightning area level of the area where the distribution line is located and the importance level of the distribution network equipment; and configuring corresponding lightning protection measures for each distribution line of the newly-built distribution network according to the lightning protection grade of the distribution line. By adopting the embodiment of the invention, the influence factors of the importance degree and the lightning zone grade of the power distribution network equipment are fully considered, the factors of the power supply requirement of a user, the power failure influence of the equipment, the network node position and the like are considered, and differentiated lightning protection measures are provided for different power distribution line sections of a newly-built power distribution network so as to avoid the situation that part of power distribution lines are excessively protected and the protection capability of part of power distribution lines is insufficient, so that the lightning protection work is pertinently carried out, the lightning protection work efficiency of a power distribution network system is effectively improved, and the economic benefit of the lightning protection work is improved on the basis of ensuring the operation reliability of the power.
Drawings
Fig. 1 is a schematic flow chart of steps of a lightning protection configuration method for a newly-built power distribution network according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the steps for determining a thunderbolt zone rating and an equipment importance rating in an embodiment of the present invention;
fig. 3 is a schematic flow chart of classification of lightning protection in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic step flow diagram of a lightning protection configuration method for a newly-built power distribution network according to an embodiment of the present invention is shown. It should be noted that the newly-built power distribution network is a newly-built power distribution network system which is not put into operation, and corresponding lightning protection measures are not configured for the newly-built power distribution network.
In order to solve the problems of poor lightning protection effect or resource waste of lightning protection measures configured on a power distribution network in the prior art, the embodiment of the invention provides a lightning protection configuration method of a newly-built power distribution network, which is implemented through steps S1 to S3:
and S1, determining the thunder area grade of the area where each distribution line in the newly-built distribution network is located and the importance degree grade of the distribution network equipment.
It should be noted that the distribution line area may be each distribution line area obtained by dividing the whole line of the newly-built distribution network by using a pole tower as a unit; or each distribution line area can be divided according to the area range spanned by the whole line of the newly-built distribution network, and the like, without influencing the beneficial effects obtained by the invention.
As a preferred implementation manner, referring to fig. 2, which is a schematic flow chart illustrating the determination of the thunderbolt zone level and the equipment importance level in the embodiment of the present invention, step S1 is performed through steps S11 to S13:
s11, obtaining historical meteorological statistical data of the area where each distribution line in the newly-built power distribution network is located; wherein the historical meteorological statistical data comprises the density of the terrestrial lightning and the annual thunderstorm day;
and S12, determining the thunder area grade of the area where the distribution line is located according to historical meteorological statistical data of the area where the distribution line is located.
In the embodiment of the invention, by acquiring the lightning density statistical data and the annual thunderstorm day statistical data of the distribution line area of the newly-built distribution network in the past several years, the lightning zone grade of the area of each distribution line in the newly-built distribution network is obtained according to the preset classification standard of the local lightning zone and the local lightning zone. The thunder zone grades comprise a few thunder zone grade, a medium thunder zone grade, a many thunder zone grade and a strong thunder zone grade.
Preferably, each lightning area grade can be further divided into a first grade and a second grade according to the lightning density statistical data and the further subdivision of the annual thunderstorm day, so that the lightning condition of the area where each distribution line in the newly-built power distribution network is located can be accurately determined.
Specifically, the preset classification standard table of the property thunder area is shown in table 1:
TABLE 1 classification standard table of the territorial thunder area
It should be noted that, in the process of obtaining historical meteorological statistical data of the area where each distribution line is located in the newly-built power distribution network, 5 years or more of monitoring data should be adopted for statistical determination, and it is not suitable to use the statistical data of the lightning density in a specific year or a short time period as a criterion for grading the lightning area of the area, so as to ensure the accuracy of grading the lightning area of the area where the distribution line is located, and further improve the effectiveness and pertinence of lightning protection measure configuration.
And S13, determining the importance degree grade of the power distribution network equipment according to the power supply object, the power failure influence range and the network node position of the power distribution network equipment.
In the embodiment of the invention, the relevant information of the power supply object, the power failure influence range and the network node position of the power distribution network equipment configured in the area where each distribution line is located is obtained to determine the importance degree grade of the power distribution network equipment. The importance degree grades of the power distribution network equipment comprise key equipment grades, important equipment grades and general equipment grades.
Specifically, in one embodiment, the relevant information of the power supply object, the power failure influence range and the network node position of the power distribution network equipment is judged according to preset power supply object, power failure influence range and network node position division standards. When the power supply object of the power distribution network equipment is a special grade or first grade important customer, the power outage range caused by the power distribution network equipment after being stopped causes a line with the power reduction load of more than 30 megawatts and less than 50 megawatts or more than 6000 households, and the network node position where the power distribution network equipment is located is a key network contact point, the power distribution network equipment is judged to be in the key equipment grade; when a power supply object of the power distribution network equipment is a secondary important customer, a power failure range caused by the shutdown of the power distribution network equipment causes a power reduction load to be more than 10 megawatts and less than 30 megawatts, or a line with more than 2000 households, and a network node position where the power distribution network equipment is located is a node with five or more branches on a main line and can not realize power transfer, judging that the power distribution network equipment is in an important equipment level; and judging other distribution network equipment except the key equipment and the important equipment to be in the general equipment level.
And S2, determining the lightning protection grade of the distribution line according to the lightning area grade of the area where the distribution line is located and the importance degree grade of the distribution network equipment.
Specifically, the lightning protection grades are divided into a primary protection grade, a secondary protection grade and a tertiary protection grade in advance; wherein the primary protection level is higher than the secondary protection level, which is higher than the tertiary protection level.
As a preferred implementation manner, refer to fig. 3, which is a schematic flow chart of dividing the lightning protection level in the embodiment of the present invention. When the importance degree grade of the power distribution network equipment in the area of the power distribution line is a key equipment grade or an important equipment grade, and the thunder area grade is a strong thunder area grade or a multi-thunder area grade, determining the lightning protection grade of the power distribution line as a first-grade protection grade;
when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a key equipment grade or an important equipment grade, and the thunder area grade is a medium thunder area grade, determining that the lightning protection grade of the power distribution line is a secondary protection grade;
when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a key equipment grade or an important equipment grade, and the lightning protection grade of the power distribution line is determined to be a three-grade protection grade when the lightning zone grade is a few-lightning zone grade;
when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a general equipment grade, and the lightning area grade is a strong lightning area grade or a multi-lightning area grade, determining that the lightning protection grade of the power distribution line is a secondary protection grade;
and when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a general equipment grade, and the lightning area grade is a medium lightning area grade or a low lightning area grade, determining that the lightning protection grade of the power distribution line is a three-grade protection grade.
And S3, configuring corresponding lightning protection measures for each distribution line of the newly-built distribution network according to the lightning protection grades of the distribution lines.
In the embodiment of the invention, each lightning protection grade is correspondingly provided with a proper lightning protection measure. And after the lightning protection grade of each distribution line is determined, configuring the distribution lines according to the lightning protection measures corresponding to the lightning protection grade.
Specifically, when the lightning protection level of the distribution line is a primary protection level, the lightning protection measures corresponding to the primary protection level include: and the lightning arresters are arranged at two ends of the cable, and the lightning arresters are arranged at two ends of the distribution transformer.
Specifically, under the primary protection level, the insulation configuration is strengthened for the whole line, and meanwhile, the anti-intrusion wave measures are taken for the incoming line terminal tower, such as configuring a gapless lightning arrester with the current capacity of 10kA type. The lightning arresters are arranged for the main line, the important branch lines and the strike sections, for example, the lightning arresters are arranged for the insulated wires on a base-by-base basis or on every 1 base basis, and for the bare wires on every 1-3 bases. Overhead ground wires are configured for a main line, important branch lines and vulnerable road sections, for example, the overhead ground wires are configured for insulated conductors and bare conductors, and a tower is additionally arranged at intervals of 1-3 bases for manual grounding. The cable is provided with gap-free arresters at both ends, for example of the type having a current capacity of 10 kA. Gapless arresters of the type having a current capacity of 10kA, preferably a gapless arrester with a lightning impulse residual voltage of not more than 45kV, are provided at both ends of the distribution transformer. Preferably, a group of lightning arresters with fixed outer series gaps are additionally arranged on the tower where the distribution transformer is located or a first base pole tower line connected with the distribution transformer to serve as pre-stage protection. And the power frequency grounding resistance of the distribution transformer, the switch station, the distribution station, the ring network unit and the box-type substation is not more than 4 omega.
When the lightning protection grade of the distribution line is a secondary protection grade, the lightning protection measures corresponding to the secondary protection grade comprise: and reinforcing insulation configuration and lightning protection breakage measures for the easy-hit road section of the distribution line, configuring lightning arresters and overhead ground wires for the main line, the important branch line and the easy-hit road section, installing the lightning arresters at two ends of the cable, and installing the lightning arresters at two ends of the distribution transformer.
Specifically, under the secondary protection level, insulation configuration and lightning protection breakage prevention measures are strengthened for the vulnerable road section, and lightning arresters are configured for the main line, the important branch line and the vulnerable road section, for example, the lightning arresters are configured every 1-3 bases for the insulated wires, and the lightning arresters are configured every 3-5 bases for the bare wires. And (3) configuring an overhead ground wire for a main line, an important branch line and a vulnerable road section, for example, configuring the overhead ground wire for an insulated conductor and a bare conductor, and additionally arranging a tower manual grounding at intervals of 2-4 bases. The cable is provided with gap-free arresters at both ends, for example of the type having a current capacity of 10 kA. Gapless arresters of the type having a current capacity of 10kA, preferably a gapless arrester with a lightning impulse residual voltage of not more than 45kV, are provided at both ends of the distribution transformer. Preferably, a group of lightning arresters with fixed outer series gaps are additionally arranged on the tower where the distribution transformer is located or a first base pole tower line connected with the distribution transformer to serve as pre-stage protection. And the power frequency grounding resistance of the distribution transformer, the switch station, the distribution station, the ring network unit and the box-type substation is not more than 4 omega.
When the lightning protection grade of the distribution line is a third-level protection grade, the lightning protection measures corresponding to the third-level protection grade comprise: and reinforcing insulation configuration and lightning protection broken line measures for the easy-to-hit road section of the distribution line.
Specifically, under the three-level protection level, the insulation configuration and the lightning protection and disconnection measures are strengthened for the vulnerable road section. In addition, the distribution of the line lightning arrester can be selected according to the operation experience or executed according to the distribution network lightning protection technical guide rule (DL/T1674-. And a tower is preferably manually grounded every 3-5 bases in the section provided with the overhead ground wire.
It should be noted that the vulnerable section represents a section of line that is vulnerable to a lightning strike or has failed by a lightning strike. The method specifically comprises the following steps: a line section passing through a mountain depression entrance, a windward slope, a mountain top, a river, a lake, a reservoir, a paddy field or an open area of a metal ore body; or a line segment adjacent to a high-voltage transmission line, a communication tower, a lightning arrester or an isolated high-projection object.
The embodiment of the invention provides a lightning protection configuration method of a newly-built power distribution network, which comprises the steps of determining the grade of a lightning area of an area where each distribution line is located in the newly-built power distribution network and the grade of the importance degree of power distribution network equipment; determining the lightning protection level of the distribution line according to the lightning area level of the area where the distribution line is located and the importance level of the distribution network equipment; and configuring corresponding lightning protection measures for each distribution line of the newly-built distribution network according to the lightning protection grade of the distribution line. By adopting the embodiment of the invention, the influence factors of the importance degree and the lightning zone grade of the power distribution network equipment are fully considered, the factors of the power supply requirement of a user, the power failure influence of the equipment, the network node position and the like are considered, and differentiated lightning protection measures are provided for different power distribution line sections of a newly-built power distribution network so as to avoid the situation that part of power distribution lines are excessively protected and the protection capability of part of power distribution lines is insufficient, so that the lightning protection work is pertinently carried out, the lightning protection work efficiency of a power distribution network system is effectively improved, and the economic benefit of the lightning protection work is improved on the basis of ensuring the operation reliability of the power.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A lightning protection configuration method for a newly-built power distribution network is characterized by comprising the following steps:
determining the grade of a lightning area of an area where each distribution line in the newly-built distribution network is located and the grade of the importance degree of the distribution network equipment;
determining the lightning protection level of the distribution line according to the lightning area level of the area where the distribution line is located and the importance level of the distribution network equipment;
and configuring corresponding lightning protection measures for each distribution line of the newly-built distribution network according to the lightning protection grade of the distribution line.
2. The lightning protection configuration method for a newly-built power distribution network according to claim 1, wherein the determining of the lightning zone level of the area where each distribution line in the newly-built power distribution network is located and the importance level of the distribution network equipment specifically comprises:
acquiring historical meteorological statistical data of an area where each distribution line in the newly-built power distribution network is located; wherein the historical meteorological statistical data comprises the density of the terrestrial lightning and the annual thunderstorm day;
determining the thunder area grade of the area where the distribution line is located according to historical meteorological statistical data of the area where the distribution line is located;
and determining the importance degree grade of the power distribution network equipment according to the power supply object, the power failure influence range and the network node position of the power distribution network equipment.
3. The lightning protection configuration method for the newly-built power distribution network according to claim 1 or 2, wherein the lightning zone grades comprise a few lightning zone grade, a medium lightning zone grade, a many lightning zone grade and a strong lightning zone grade; the importance degree grades of the power distribution network equipment comprise key equipment grades, important equipment grades and general equipment grades.
4. The lightning protection configuration method of the newly-built power distribution network according to claim 3, wherein the lightning protection grades are divided into a primary protection grade, a secondary protection grade and a tertiary protection grade in advance; wherein the primary protection level is higher than the secondary protection level, which is higher than the tertiary protection level.
5. The method for configuring lightning protection of a newly-built power distribution network according to claim 4, wherein the determining the lightning protection level of the power distribution line according to the lightning area level of the area where the power distribution line is located and the importance level of the power distribution network equipment specifically comprises:
when the importance degree grade of the power distribution network equipment in the area of the power distribution line is a key equipment grade or an important equipment grade, and the thunder area grade is a strong thunder area grade or a multi-thunder area grade, determining the lightning protection grade of the power distribution line as a first-grade protection grade;
when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a key equipment grade or an important equipment grade, and the thunder area grade is a medium thunder area grade, determining that the lightning protection grade of the power distribution line is a secondary protection grade;
and when the importance degree grade of the power distribution network equipment in the area of the power distribution line is a key equipment grade or an important equipment grade, and the lightning protection grade of the power distribution line is determined to be a three-grade protection grade when the lightning area grade is a few-lightning area grade.
6. The method for configuring lightning protection of a newly-built power distribution network according to claim 4, wherein the determining the lightning protection level of the power distribution line according to the lightning area level of the area where the power distribution line is located and the importance level of the power distribution network equipment specifically comprises:
when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a general equipment grade, and the lightning area grade is a strong lightning area grade or a multi-lightning area grade, determining that the lightning protection grade of the power distribution line is a secondary protection grade;
and when the importance degree grade of the power distribution network equipment in the area where the power distribution line is located is a general equipment grade, and the lightning area grade is a medium lightning area grade or a low lightning area grade, determining that the lightning protection grade of the power distribution line is a three-grade protection grade.
7. The method for configuring lightning protection of a newly-built distribution network according to claim 4, wherein the step of configuring corresponding lightning protection measures for each distribution line of the newly-built distribution network according to the lightning protection class of the distribution line comprises:
when the lightning protection grade of the distribution line is a primary protection grade, the lightning protection measures configured for the distribution line comprise: the method comprises the following steps of (1) carrying out all-line reinforced insulation configuration and lightning protection breakage measures on the distribution line, configuring lightning arresters and overhead ground wires on a main line, important branch lines and vulnerable road sections, installing the lightning arresters at two ends of a cable, and installing the lightning arresters at two ends of a distribution transformer; wherein the vulnerable road segment represents a line segment that is vulnerable to lightning strikes.
8. The method for configuring lightning protection of a newly-built distribution network according to claim 4, wherein the step of configuring corresponding lightning protection measures for each distribution line of the newly-built distribution network according to the lightning protection class of the distribution line comprises:
when the lightning protection grade of the distribution line is a secondary protection grade, the lightning protection measures configured for the distribution line comprise: reinforcing insulation configuration and lightning protection breakage measures for the easy-hit road section of the distribution line, configuring lightning arresters and overhead ground wires for the main line, the important branch line and the easy-hit road section, installing the lightning arresters at two ends of the cable, and installing the lightning arresters at two ends of the distribution transformer; wherein the vulnerable road segment represents a line segment that is vulnerable to lightning strikes.
9. The method for configuring lightning protection of a newly-built distribution network according to claim 4, wherein the step of configuring corresponding lightning protection measures for each distribution line of the newly-built distribution network according to the lightning protection class of the distribution line comprises:
when the lightning protection grade of the distribution line is a three-grade protection grade, the lightning protection measures configured for the distribution line comprise: reinforcing insulation configuration and lightning protection broken line measures for the easy-to-hit road section of the distribution line; wherein the vulnerable road segment represents a line segment that is vulnerable to lightning strikes.
10. The method for configuring lightning protection of a newly-built distribution network according to any one of claims 7 to 9, wherein the vulnerable road section is a line section passing through a mountain down-hole, a windward slope, a mountain top, a river, a lake, a reservoir, a paddy field or an open area of a metal ore body; or the easy-hit road section is a line section adjacent to the high-voltage transmission line, the communication iron tower, the lightning arrester or the isolated high-protrusion object.
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| Publication number | Priority date | Publication date | Assignee | Title |
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