CN103915810A - Lightning protection method for 500 kV circuit JG type pole and tower - Google Patents
Lightning protection method for 500 kV circuit JG type pole and tower Download PDFInfo
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Abstract
The invention discloses a lighting protection method for a 500 kV circuit JG type pole and tower. The method comprises the steps that (1) lightning damage risk evaluation is conducted on the 500 kV circuit JG type pole and tower with the adoption of the differentiation lightning protection technology; (2) an initial lightening scheme is made according to a lightning damage risk evaluation analysis result; (3) technical-economic evaluation is conducted on the initial lightening scheme with the adoption of an improved analytic hierarchy process, and an optimal lightening protection scheme is obtained through selection. After the JG type pole and tower are modified through the recommended lightning measure, the lightening damage risk grade is lowered to be lower than the grade II, and the requirement for circuit lightening stroke trip-out rate in the 110(66) kV-500 kV Overhead Transmission Line Management Standard is met.
Description
Technical field
The present invention relates to transmission line lightning protection field, relate in particular to the lightning-protection method of 500kV circuit JG type shaft tower.Background technology
Effect after the application purpose of various lightning protection measuress and enforcement is different, and expense, the difficulty of different regions enforcement different measure are not identical yet.But in Practical Project, a lot of areas still adopt the Lightning Transformation way to manage of extensive style, do not consider circuit and lightning protection measures feature, the single lightning protection measures of selection of indifference is administered, make regulation effect not remarkable, transformed shaft tower need to carry out secondary transformation, has greatly wasted human and material resources.Effectively lightning protection measures transformation can improve the lightning protection properties of transmission line, and the Technical Economy assessment of lightning protection measures is the basis of improving transmission line Lightning Transformation input-output ratio.
In recent years; the lean management expectancy of transmission line is more and more higher; the lightning protection of transmission line differentiation also becomes study hotspot; advance rapidly taking power transmission line corridor lightning distribution, features of terrain and shaft tower insulation as basic differentiation shocking preventing technology and application; at present there is the patent about differential transmission circuit alienation lightning-protection method, but also there is no the achievement in research for JG type shaft tower differentiation lightning protection specially.
Summary of the invention
The deficiency existing for solving prior art, further improve operation of power networks reliability, and take rationally effectively lightning protection measures for circuit own characteristic, realize the lean management of transmission line, be necessary that the circuit to adopting JG type angle tower carries out differentiation lightning protection research.The present invention is directed to 500kV circuit JG type shaft tower and carry out damage to crops caused by thunder risk analysis and formulate differentiation schemes of prevention against lightning, to improve the lightning protection properties of JG type shaft tower.
For achieving the above object, concrete scheme of the present invention is as follows:
The lightning-protection method of 500kV circuit JG type shaft tower, comprises the following steps:
Step 1: according to the feature of 500kV circuit JG type shaft tower, adopt differentiation shocking preventing technology to carry out damage to crops caused by thunder risk assessment, obtain damage to crops caused by thunder risk class corresponding to JG type shaft tower under varying environment;
Step 2: damage to crops caused by thunder risk class corresponding to JG type shaft tower obtaining according to step 1 formulated the preliminary schemes of prevention against lightning of whole 500kV circuit JG type shaft tower;
Step 3: adopt improving layer fractional analysis to carry out Technical Economy assessment to preliminary schemes of prevention against lightning, select optimum schemes of prevention against lightning.
Described JG type shaft tower is A, B, C three-phase rounded projections arranged, the middle top mutually, both sides that is positioned at mutually, and more easily there is shielding flashover in middle phase jumping wire and outer corner limit phase insulator.
In described step 1,500kV circuit JG type angle tower is carried out to the risk assessment of shielding damage to crops caused by thunder; the Characteristic of Lightning Shielding Failure analysis of transmission line mainly adopts electric geometrical model method; the factor that damage to crops caused by thunder risk assessment is considered comprises tower structure, insulation configuration, dodges density, topography and geomorphology and climate condition to shaft tower their location; also consider the special character of JG type shaft tower: outer corner ground wire weakens the protective effect of wire, and this point cannot be taken into account in electric geometrical model.
The grade classification of described risk assessment is taked following graded index:
Table 1 damage to crops caused by thunder risk assessment grade graded index
In described step 1, by damage to crops caused by thunder risk assessment, area with more lightning activities and more than, ground dodges density >=2.78 time/km2a, in Plain be the damage to crops caused by thunder risk class of JG type shaft tower of ground elevation <10 ° more than III level, be that the damage to crops caused by thunder risk class of the JG2 type shaft tower of ground elevation >=10 ° is IV level in mountain region.
In described step 2, according to operating experience and in conjunction with pluses and minuses and the scope of application of various lightning protection measuress, and the concrete ruuning situation of circuit, the Lightning Transformation of JG type shaft tower is mainly adopted and reduce pole tower ground resistance, leakage conductor is installed and three kinds of measures of tower top side pin are installed.
In described step 3, lightning protection measures recruitment evaluation adopts improved analytic hierarchy process (AHP), reduce effect, engineering cost, transformation target, transform difficulty, safeguard that difficulty and service life are as criterion taking trip-out rate, to select the most rational measure as target, carry out lightning protection measures recruitment evaluation, according to the weights of various measures, it is the lightning protection measures of the JG type shaft tower selection differences in different terrain.
In described step 3, while selecting optimum schemes of prevention against lightning, in area with more lightning activities and more than, and landform is that the JG type angle tower in hills or mountain region is installed 2 branch line lightning arresters, 2 branch line lightning arresters are loaded on respectively cross-arm middle phase jumping wire place and get along in outer corner limit;
In the JG in Plain type shaft tower, 3 tower top side pins are installed, 3 tower top side pins are installed on respectively on limit phase conductor cross-arm and wire jumper cross-arm, to reduce the shielding angle of three-phase conducting wire, will keep less earth resistance simultaneously.
Beneficial effect of the present invention:
The present invention takes into full account the difference of the transmission line time and space, consider various factors and the features such as the lightening activity, line construction, topography and geomorphology of transmission line, adopt the lightning parameter obtaining based on lightning monitoring system statistics analysis of the inspected data, the specific shaft tower of transmission line is carried out to lightning protection calculation, reflected the relative lightning protection properties power of a transmission line identical tower shaft tower under varying environment.
This lightning-protection method, for JG type angle tower, has been considered the outer corner ground wire particularity that effect weakens to wire-protecting of JG type angle tower, has ensured to take the Technical Economy of lightning protection measures.After adopting the lightning protection measures of recommending to transform to JG type shaft tower, damage to crops caused by thunder risk class is reduced to below II level, meets the requirement to lightning outage rate in " 110 (66) kV～500kV overhead transmission line management regulation ".This lightning-protection method can be generalized to all and similar angle tower of JG type tower structure.
Brief description of the drawings
Fig. 1 specific embodiments of the invention JG2 type shaft tower schematic diagram;
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in detail:
The lightning-protection method of 500kV circuit JG2 type shaft tower, comprises the following steps:
Step 1: according to the feature of 500kV circuit JG type shaft tower, adopt differentiation shocking preventing technology to carry out damage to crops caused by thunder risk assessment, obtain damage to crops caused by thunder risk class corresponding to JG type shaft tower under varying environment;
Step 2: damage to crops caused by thunder risk class corresponding to JG type shaft tower obtaining according to step 1 formulated the preliminary schemes of prevention against lightning of whole 500kV circuit JG type shaft tower;
Step 3: adopt improving layer fractional analysis to carry out Technical Economy assessment to preliminary schemes of prevention against lightning, select optimum schemes of prevention against lightning.
Described JG2 type shaft tower is A, B, C three-phase rounded projections arranged, the middle top mutually, both sides that is positioned at mutually, and more easily there is shielding flashover in middle phase jumping wire and outer corner limit phase insulator.
In described step 1, JG2 type shaft tower is carried out to the risk assessment of shielding damage to crops caused by thunder; the Characteristic of Lightning Shielding Failure analysis of transmission line mainly adopts electric geometrical model method; the factor that damage to crops caused by thunder risk assessment is considered comprises tower structure, insulation configuration, dodges density, topography and geomorphology and climate condition to shaft tower their location, has also considered the special character of JG2 type shaft tower: outer corner ground wire weakens the protective effect of wire.
The grade classification of described risk assessment is taked following graded index:
Table 1 damage to crops caused by thunder risk assessment grade graded index
In described step 1, by damage to crops caused by thunder risk assessment, area with more lightning activities and more than, ground dodges density >=2.78 time/km2a, in Plain be the damage to crops caused by thunder risk class of JG2 type shaft tower of ground elevation <10 ° more than III level, be that the damage to crops caused by thunder risk class of the JG2 type shaft tower of ground elevation >=10 ° is IV level in mountain region.
In described step 2, according to operating experience and in conjunction with pluses and minuses and the scope of application of various lightning protection measuress, and the concrete ruuning situation of circuit, the Lightning Transformation of JG2 type shaft tower is mainly adopted and reduce pole tower ground resistance, leakage conductor is installed and three kinds of measures of tower top side pin are installed.
In described step 3, lightning protection measures recruitment evaluation adopts improved analytic hierarchy process (AHP), reduce effect, engineering cost, transformation target, transform difficulty, safeguard that difficulty and service life are as criterion taking trip-out rate, to select the most rational measure as target, carry out lightning protection measures recruitment evaluation, according to the weights of various measures, it is the lightning protection measures of the JG2 type shaft tower selection differences in different terrain.
As shown in Figure 1, shaft tower is JG2 type angle tower, and it is 3.57 times/square kilometre of years that shaft tower their location is dodged density fifty-fifty, and minefield grade is C1 level, belongs to area with more lightning activities.Landform is divided Plain and mountain region, and in the situation that wind speed is less than 30m/s, the shielding flashover risk evaluation result of JG2 shaft tower is as table 2.
The shielding flashover risk evaluation result of table 2JG2 shaft tower
| Landform | Shielding trip-out rate | Risk class |
| Plain | 0.203 | Ⅲ |
| Mountain region | 0.255 | Ⅳ |
Adopt improving layer fractional analysis, taking trip-out rate reduce effect, engineering cost, transformation target, transform difficulty, safeguard difficulty, service life is as criterion, to select the most rational measure as target, carries out lightning protection measures recruitment evaluation, assessment result is as table 3.According to the weights of various measures, the optimum measure in Plain is tower top side pin, and the optimum measure in mountain region is lightning arrester.
Table 3 lightning protection measures assessment result
JG2 type shaft tower A, B, C three-phase rounded projections arranged, the middle top mutually, both sides that is positioned at mutually, more easily there is shielding flashover in middle phase jumping wire and outer corner limit phase insulator.
Suggestion in area with more lightning activities and more than, and landform is that the JG2 type angle tower in hills or mountain region is installed 2 branch line lightning arresters, is loaded on respectively cross-arm middle phase jumping wire place and get along in outer corner limit.
In the JG2 in Plain type shaft tower, 3 tower top side pins are installed, are installed on respectively on limit phase conductor cross-arm and wire jumper cross-arm, to reduce the shielding angle of three-phase conducting wire, will keep less earth resistance simultaneously.
According to the Lightning Transformation measure of each base shaft tower recommend adoption, again carry out lightning stroke flashover risk assessment, obtain Lightning Transformation expection regulation effect.JG2 shaft tower expection regulation effect assessment result is as table 4.
Table 4 is expected regulation effect assessment
| Index | Trip-out rate | Risk class | Measure |
| Plain | 0.092 | Ⅱ | 3 tower top side pins |
| Mountain region | 0.096 | Ⅱ | 2 lightning arresters (middle phase and outer corner limit phase) |
Claims (7)
- The lightning-protection method of 1.500kV circuit JG type shaft tower, is characterized in that, comprises the following steps:Step 1: according to the feature of 500kV circuit JG type shaft tower, adopt differentiation shocking preventing technology to carry out damage to crops caused by thunder risk assessment, obtain damage to crops caused by thunder risk class corresponding to JG type shaft tower under varying environment;Step 2: damage to crops caused by thunder risk class corresponding to JG type shaft tower obtaining according to step 1 formulated the preliminary schemes of prevention against lightning of whole 500kV circuit JG type shaft tower;Step 3: adopt improving layer fractional analysis to carry out Technical Economy assessment to preliminary schemes of prevention against lightning, select optimum schemes of prevention against lightning.
- 2. the lightning-protection method of 500kV circuit JG type shaft tower as claimed in claim 1, is characterized in that, described JG type shaft tower is A, B, C three-phase rounded projections arranged, the middle top mutually, both sides that is positioned at mutually, and more easily there is shielding flashover in middle phase jumping wire and outer corner limit phase insulator.
- 3. the lightning-protection method of 500kV circuit JG type shaft tower as claimed in claim 1; it is characterized in that; in described step 1, JG type shaft tower is carried out to the risk assessment of shielding damage to crops caused by thunder; the Characteristic of Lightning Shielding Failure analysis of transmission line mainly adopts electric geometrical model method, and the factor that damage to crops caused by thunder risk assessment is considered comprises tower structure, insulation configuration, dodges density, topography and geomorphology and climate condition to shaft tower their location.
- 4. the lightning-protection method of 500kV circuit JG type shaft tower as claimed in claim 1; it is characterized in that; in described step 1; by damage to crops caused by thunder risk assessment; area with more lightning activities and more than; ground dodges density >=2.78 time/km2a, in Plain be the damage to crops caused by thunder risk class of JG type shaft tower of ground elevation <10 ° more than III level, be that the damage to crops caused by thunder risk class of the JG type shaft tower of ground elevation >=10 ° is IV level in mountain region.
- 5. the lightning-protection method of 500kV circuit JG type shaft tower as claimed in claim 1; it is characterized in that; in described step 2; according to operating experience and in conjunction with pluses and minuses and the scope of application of various lightning protection measuress; and the concrete ruuning situation of circuit, the Lightning Transformation of JG type shaft tower is mainly adopted and reduce pole tower ground resistance, leakage conductor is installed and three kinds of measures of tower top side pin are installed.
- 6. the lightning-protection method of 500kV circuit JG type shaft tower as claimed in claim 1; it is characterized in that; in described step 3; lightning protection measures recruitment evaluation adopts improved analytic hierarchy process (AHP); reduce effect, engineering cost, transformation target, transform difficulty, safeguard that difficulty and service life, as criterion, to select the most rational measure as target, carries out lightning protection measures recruitment evaluation taking trip-out rate; according to the weights of various measures, it is the lightning protection measures of the JG type shaft tower selection differences in different terrain.
- 7. the lightning-protection method of 500kV circuit JG type shaft tower as claimed in claim 1, it is characterized in that, in described step 3, while selecting optimum schemes of prevention against lightning, in area with more lightning activities and more than, and landform is that the JG type angle tower in hills or mountain region is installed 2 branch line lightning arresters, and 2 branch line lightning arresters are loaded on respectively cross-arm middle phase jumping wire place and get along in outer corner limit;In the JG in Plain type shaft tower, 3 tower top side pins are installed, 3 tower top side pins are installed on respectively on limit phase conductor cross-arm and wire jumper cross-arm, to reduce the shielding angle of three-phase conducting wire, will keep less earth resistance simultaneously.
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| CN105045274A (en) * | 2015-04-30 | 2015-11-11 | 南方电网科学研究院有限责任公司 | Intelligent tower connected graph construction method for unmanned aerial vehicle inspection track planning |
| CN105322460A (en) * | 2015-09-02 | 2016-02-10 | 贵州电网有限责任公司电网规划研究中心 | Thunder-proof planning method for overhead distribution line in thunderstorm weather |
| CN107800072A (en) * | 2017-09-22 | 2018-03-13 | 国网浙江省电力公司宁波供电公司 | System of selection for distribution line shaft tower lightning protection device |
| CN108110721A (en) * | 2017-11-24 | 2018-06-01 | 国网北京市电力公司 | Arrester installation method and device |
| CN109888711A (en) * | 2019-03-15 | 2019-06-14 | 广州供电局有限公司 | The analysis O&M method of 500kV electric power line pole tower ground state |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108110721A (en) * | 2017-11-24 | 2018-06-01 | 国网北京市电力公司 | Arrester installation method and device |
| CN109888711A (en) * | 2019-03-15 | 2019-06-14 | 广州供电局有限公司 | The analysis O&M method of 500kV electric power line pole tower ground state |
| CN109888711B (en) * | 2019-03-15 | 2021-10-08 | 广东电网有限责任公司广州供电局 | Analysis, operation and maintenance method for grounding state of 500kV power transmission line tower |
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