Analysis of emergency disconnections of main power lines.
Journal Title: Наукові праці Донецького Національного Технічного Університету серія: Електротехніка і Енергетика - Year 2018, Vol 1, Issue 1
Abstract
Automatic disconnections in trunk transmission lines 750 kv as a result of geomagnetic induction currents is studied The influence of geomagnetic induction currents on emergency switching-off of the main transmission lines is investigated. A mathematical model for the estimation of tension level of the geoelectric field, based on the data of the geomagnetical field oscillation of the Earth is worked out . The model takes into account the conductivity of the earth's crust for each of the regions. The present ed graphs show geoelectric field oscillations for one of emergency outages on 750 kV transmission lines. On the basis of fluctuations studies on the surface potential of the earth on the territory of Ukraine, one can consider as intensive perturbations whose value is greater than 4 V/km. The statistical diagrams of coincidences of the maximum value of the surface potential with the disconnection of power lines are given. In 33 cases on the days of outages we observed strong geomagnetic disturbances, which led to the imposition of a surface potential in the regions where these lines pass. These trips account for 87% of all failures without established causes.
Authors and Affiliations
B. ZHUK, V. V. Kyryk
Keywords
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