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The islanding condition of grid-tied solar power plant with hydro power plant of commensurable power is considered in this article. Based on the results of the article, the relevant conclusions were drawn.

There are emergency automatics systems (EA) widely used in Unified Power System (UPS) of Russian Federation. Main focus of article is centered on design principles of preventive automatics for stability control schemes (PASCS) as this automatics is the most complex type of EA. Features of PASCS are determined by modern state-of-the-art of digital technique and information technology, that decide the innovative developmental character of PASCS. Information about development and implementation of centralized emergency automation systems (CEAS) in power systems of Russian Federation is also given here.

The Modern electrical drive systems which able to operate in variable-speed mode became a conventional setup since power electronics-based frequency converters became wide spread. Nevertheless, specific parasitic phenomena of bearing currents always accompanying drive systems fed by frequency converters. In electrical machines, especially in small size motors, major role in parasitic current patch plays capacitance between stator winding and rotor surface. In this paper it will be considered influence of winding insulation type on the bearing voltage ratio and corresponding winding-to-rotor capacitance.