Differential lightning-proof reconstruction method of 35kV power transmission line

Abstract

The invention relates to a differential lightning-proof reconstruction method of a 35kV power transmission line, belongs to the technical field of lightning protection for power facilities and solves the technical problems by providing the reconstruction method of the 35kV power transmission line, whereby lightning damage is effectively avoided for the power transmission line. According to the technical scheme, the method includes the steps of collecting the pole type, insulation configuration, topographic conditions and historical lightning fault information of existing 35kV power transmission line pole / tower equipment, and subjecting the pole / tower equipment, not satisfactory to lightning protection, to data statistics; subjecting a power transmission line pole / tower ground network, not satisfactory to lightning protection, to reconstruction and to differential insulation reconstruction, and mounting lighting arrestors; recording the state of the reconstructed 35kV power transmission line pole / tower equipment in a power production management system, and combining the state with GIS (geographic information system) information to form a GIS map of the power transmission line pole / tower equipment. The method is suitable for power systems.

Description

technical field [0001] The invention discloses a 35kV transmission line differential lightning protection transformation method, which belongs to the technical field of electric facility protection. Background technique [0002] As we all know, most of the 35kV transmission lines are ungrounded or small grounded systems, which are characterized in that single-phase grounding will not cause line tripping. The power dispatching regulations stipulate that single-phase grounding operation can not exceed 2 hours, and the system capacity continues to increase. In practice, the system It has been unable to withstand 2 hours of single-phase grounding operation, which brings hidden dangers to the safe operation of electric power. Therefore, it is necessary to avoid the occurrence of single-phase permanent grounding faults. [0003] Generally, after a single-phase grounding of a 35kV transmission line, after a delay of 30s, the grounding information will be sent to the power dispatchi...

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Problems solved by technology

[0004] In summary, when single-phase grounding factors such as wind deviation, bird damage, and pollution occur on the 35kV transmission line, except for wind deviation between phases and large-area pollution flashover, it will basically not cause line tripping. Therefore, the focus of treatment on 35kV transmission lines can be excluded. Outage caused by single-phase ground faults such as wind deviation, bird damage, pollution, etc.; on the basis of the analysis of the above reasons for tripping, it can be known that the main reason for the outage of 35kV transmission lines during operation is lightning strikes, because there are a large number of Due to the untimely replacement of zero-value insulators and the accelerated aging of single-phase grounding, a large number of low-value and zero-value insulators have been operated. In the thunderstorm season, it is very easy to cause insulation breakdown to form single-phase permanent grounding and phase-to-phase faults. At the same time, due to the defect of the grounding device of the 35kV transmission line, the lightning current cannot be released in time after the lightning falls on the tower, resulting in the line tripping and outage

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