A Differential Lightning Protection Transformation Method for 35kv Transmission Lines

Abstract

The invention discloses a differential lightning protection modification method for 35kV transmission lines, which belongs to the technical field of electric facility lightning protection; the technical problem to be solved is: to provide a 35kV transmission line modification method that can effectively avoid the lightning hazard of transmission lines; the adopted technical scheme is as follows: : A 35kV transmission line differential lightning protection transformation method, comprising the following steps: first, collecting the tower type, insulation configuration, terrain conditions and historical lightning strike fault information of the existing 35kV transmission line tower equipment, and those that do not meet the lightning protection requirements The data statistics of the tower equipment of the transmission line are carried out; secondly, the grounding network of the transmission line tower that does not meet the lightning protection requirements is transformed, the poor insulation is transformed, and the lightning arrester is installed; thirdly, the status of the transformed 35kV transmission line tower equipment is entered into the power production management system, And combined with GIS information to form a GIS map of transmission line tower equipment; 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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