Abstract
The paper presents the results of research in lightning surge waves and switching overvoltages transferred from a network of 220 kV to the 15.65 kV level of the step-up transformer in HPP 'Bajina Bašta'. Analysis of survey results lead to conclusion that transferred overvoltages can endanger 15.65 kV transformer windings and stator winding insulation. It was therefore suggested for the protection of the 15.65 kV isolation to install metal oxide surge arresters at a suitable place between the power generator bus bars and earthing.
Highlights
The paper presents the results of research in lightning surge waves
switching overvoltages transferred from a network of 220 kV
Analysis of survey results lead to conclusion that transferred overvoltages can endanger
Summary
Maksimalne vrednosti prenetih napona na izolaciji [15,65] kV namotaja blok transformatora 242kV/15,65kV i izolaciji namotaja statora generatora dati su u tabelama 1 i 2 u procentima primenjene akcije prema izrazu: Akcija U1U1V oblika 1,3/57 μs/μs (sečen talas, ordinata levo) na 242 kV priključcima 1U i 1V i preneti naponi U2U, U2V i U2W (ordinata desno) na [15,65] kV strani blok transformatora 242kV/15.65kV kada je priključen generator (šema kada je blok na mreži)
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