| Lightning is a natural disaster.Transmission lines erected on the field and in the high mountains, which is very easy to be struck by lightning. Transmission lines will be impacted by huge overvoltage and lightning current after being struck by lightning, which may cause the line tripping, the insulator string flashover, even will cause conductor, overhead ground wire broken, cause outage even cause blackout accident.Linan is located in Northwest Mountain Area of Zhejiang, As the western suburbs of Hangzhou heavy minefield, Frequent tripping fault of Linan electric power backbone network composed of110kV transmission lines caused by lightning,which has a great impact on the safe operation of power grid and power supply reliability.In this paper, from the analysis of the principle of lightning discharge, Through the analysis of transmission line lightning flashover voltage related principle and calculation method, The causes of110kV transmission line lightning trip in Linan area were analyzed, the characteristics of lightning trip out of transmission line and problems. The tower reconstruction can take projects in the grounding resistance, erecting coupling ground wire, increasing line insulation and lightning arrester installation line measures carried out analysis of the actual effect. Taking110kV Banqiao1280line, Gangjin1287line as the object,Through the calculation of the lightning protection measures, And the implementation of the lightning protection reform, gain The effect of practice. Finally, combined with the actual situation of power transmission line operation, Put forward the comprehensive reform of lightning protection measures for110kV transmission line in Ling’an power grid.Through this paper, can be expected to engage in lightning protection of overhead transmission line colleagues and the relevant technical staff to reference. |
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