Browsing by Author "Yatseyko, Andriy"

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Ferroresonant processes in 10 kV power grids and there control
(Lviv Polytechnic Publishing House, 2015) Yatseyko, Andriy; Hyrska, Kateryna; Lviv Polytechnic National University
The problem of ferroresonance processes in power gris with isolated neutral was reviewed. Conditions of the existence of such phenomena and basic principles of theis control were establihed. A new approaches of protection for 10 kV electric systems from ferroresonant processes were given. The research was conducted using digital simulation and reasons for offered protection methods were defined.
Impact of the operating mode of neutral in 35 kV power grids on the arc overvoltages and voltage teasuring transformers
(Lviv Polytechnic Publishing House, 2015) Yatseyko, Andriy; Andrushko, Volodimir; Lviv Polytechnic National University
Has been analyzed possible methods of earthing of neutrals in 35 kV power grid. Among the most common injuries in these electrical system are arc circuits, that is why the dependence of overvoltage multiplicities on the nature of earth arcing and on the method of earth arrangement of electrical system neutral. Given that in 35 kV power grids may arise ferroresonant processes, operation of voltage measuring transformers has been researched during unstable earth arcing.
Research of ferroresonance processes in 330 kV switchgear of Rivne NPP
(2016) Yatseyko, Andriy; Andrushko, Volodymyr; Lviv Polytechnic National University
Conditions of developmentferroresonance processes (FRP) in power networks with grounded neutral is investigated andcauses of failure voltage transformers type of NKF is established. Simulations of ferroresonance processes in collective tire VRZ 330 kV Rivne NPP has been done by mathematical model at different voltage of power network and various operating circuit switching.