A Reliability Evaluation Method for Overhead Distribution Lines in Thunderstorm Weather
A technology of distribution lines and evaluation methods, applied in the direction of electrical digital data processing, instruments, calculations, etc., can solve the problems of lack of effective means for reliability evaluation of overhead distribution lines, and achieve the effect of reliable calculation and evaluation
Active Publication Date: 2018-02-16
CHONGQING UNIV
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Problems solved by technology
[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for evaluating the reliability of overhead power distribution lines under thunderstorm weather, which is used to solve the problem of reliability evaluation of overhead power distribution lines under the influence of future thunderstorm weather in the prior art. The lack of effective means is used to provide a feasible method for the reliability evaluation of overhead distribution lines under thunderstorm weather, and to provide guidance and auxiliary information for the planning and operation of distribution networks
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Embodiment
[0092] This calculation example takes a distribution line with a total length of 15km in the coastal area as an example, and uses the reliability evaluation method of the overhead distribution line under thunderstorm weather according to the present invention to confirm the reliability of the overhead distribution line for its reliability. sexual evaluation.
[0093] In this embodiment, the historical data of fault outage and fault maintenance historical data of the overhead distribution line are counted, and the geometric parameters of the overhead distribution line are obtained. The insulators are pin-type insulators (P-15), and the lightning impulse withstand voltage of the insulator string is 150kV; the conductors are arranged in a triangle, b=0, and the conductor sag is 0.5m.
[0094] Lightning activities under severe thunderstorm weather in the present embodiment of table 2
[0095]
[0096] Table 3 U50% and minimum arc distance of different insulators in this embodi...
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The invention provides a method for evaluating reliability of an overhead power distribution line in the thunderstorm weather. According to the method, a time sequence characteristic of lightning faults of the power distribution line during thunderstorm is analyzed based on fault outage historical data of the overhead power distribution line and faulty repair historical data of the overhead power distribution line, and a lightning stroke climatic factor causing faults of the overhead power distribution line in the thunderstorm weather, a lightning stroke faulty repair difficulty factor, a geometrical parameter factor of the overhead power distribution line and an electrical configuration factor are comprehensively taken into consideration to establish a reliability calculation model for the overhead power distribution line to evaluate the reliability of the overhead power distribution line in the thunderstorm weather, so that practical factor conditions of the overhead power distribution line in various aspects can be shown well, thereby facilitating more accurate and reliable calculation and evaluation of the reliability of the overhead power distribution line in the thunderstorm weather, and providing effective guiding auxiliary information for planning and operation of a distribution network.
Description
technical field [0001] The invention belongs to the technical field of reliability evaluation of power distribution lines in bad weather, and in particular relates to a reliability evaluation method of overhead power distribution lines in thunderstorm weather. Background technique [0002] Thunderstorms are one of the natural disasters that seriously affect human production and life. The distribution line has the characteristics of large quantity and wide area, and undertakes the important task of distributing electric energy to low-voltage loads. The insulation level of medium-voltage overhead lines is low, there is generally no lightning protection, and the grid structure is complex. Once the thunderstorm disaster strikes, the line will often be damaged. Compared with high-voltage transmission lines, overhead distribution lines exposed to the external environment are more likely to suffer from lightning strikes, causing power interruptions and affecting the reliability le...
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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 谢开贵胡博尹蕾何敏郝钰
Owner CHONGQING UNIV