20kV power distribution network rapid first-aid repair method based on equipment typical fault probability analysis

Abstract

The invention discloses a 20kV power distribution network rapid first-aid repair method based on equipment typical fault probability analysis. The method comprises the following steps: calculating the fault probability and the annual forced shutdown time of each 20kV power distribution network equipment; ranking is carried out according to the failure rate and the annual forced outage time, and a typical defect library influencing the reliability of the 20kV power distribution network is established according to the ranking sequence; the typical defect causes of the power distribution equipment are analyzed one by one, related factors influencing the reliability of the power distribution equipment are determined, and maintenance and protection measures of the 20kV power distribution network are formulated according to analysis results of the typical defect causes of the power distribution equipment and the reliability influence factors; the fault first-aid repair process is improved; if no new fault defect occurs in the fault first-aid repair process, maintenance is completed; and if a new fault defect occurs in the fault first-aid repair process, continuously updating the typical fault defect library and the maintenance measures thereof to form closed-loop control. The active maintenance after the distribution network fault is realized, and the power supply service level and the power supply quality are improved.

Description

technical field [0001] The invention relates to a rapid repair method for a 20kV distribution network based on the probability analysis of typical equipment failures. Background technique [0002] In recent years, my country has continuously increased its investment in distribution network construction and has achieved remarkable results. However, there is still a certain gap compared with developed countries. The development of urban and rural areas is unbalanced, and the power supply capacity and quality cannot meet the needs of rapid economic and social development. development needs. For whether the distribution network is advanced, the first intuitive criterion is the reliability of power supply. Compared with developed countries, our country still has a large gap in indicators such as failure rate, power supply reliability rate, average power outage time and average repair time that characterize the reliability of distribution network. larger. The reasons for the abo...

AI Technical Summary

Problems solved by technology

At present, the early distribution network construction of many power supply companies is independently designed according to the distribution of districts, villages and towns. It lacks systematic planning and unified equipment maintenance and management. Therefore, the foundation is weak, and the cable conversion rate and equipment automation level are low.

In addition, power supply companies located in coastal areas are greatly affected by typhoons and thunderstorms, and there are many factors that affect the safe operation of overhead lines. These factors will have a negative impact on the reliability of power supply in the distribution network. The occurrence rate of network failure and emergency repair rate are also relatively high

However, at present, many power supply companies lack effective monitoring, analysis and evaluation of the reliability of distribution network equipment, and have not established a defect library and maintenance method library for distribution network equipment, thus lacking historical data combined with distribution network reliability analysis To guide the maintenance work of the distribution network, resulting in blind and passive maintenance after the distribution network fails, it is difficult to find the fault, it takes a long time to repair the fault, the maintenance personnel have a heavy workload, low work efficiency, repeated waste of resources and large useless consumption, and then Increased cost of power supply company outages

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