Overvoltages transferred from a network of 220 kV to 15.65 kV level of the step-up transformer in HPP 'Bajina Bašta'

• Main Authors: Vukelja Petar, Mrvić Jovan
• Format: Article
• Language: English
• Published: Electrical Engineering Institute Nikola Tesla 2011-01-01
• Series: Zbornik Radova: Elektrotehnički Institut "Nikola Tesla"
• Subjects: overvoltages; insulation; transformer; generator
• Online Access: http://scindeks-clanci.ceon.rs/data/pdf/0350-8528/2011/0350-85281121223V.pdf

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.