The effectiveness of the ship electric propulsion system has been calculated with the help of analytical expressions and modeling. The propulsion factor of models is lower than that of full-scale prototype ships due to the scale effect, and depends on the propulsor type, its size, rotation frequency and workmanship quality. The propulsion characteristic scaling factor is mainly determined by the difference of resistance of the original and model and cannot be scaled, which needs to be specified when transitioning to the original. Calculations of traction characteristics of propulsion system of model single-shaft cargo ship are made and methodology of characteristics transfer to the original is shown. Diagrams for calculation of stopper coefficients, power, torque depending on propeller pitch and propeller pitch for steerable propeller and water jet are given. For river ships and mixed sea-river ships, which often maneuver at low speeds and at shallow depths, calculations of water jet efficiency with account of flow slope up to angles less than 200 are made. The area of water shuttle valve operation with "forbidden zone" is estimated and necessity of development of a universal methodology for calculating steerability of vessels is shown.

In modern conditions, the loss of electricity and power can be reduced by using the following innovative solutions in the designs of power transformers: the use of the effect of low- and high-temperature superconductivity, the introduction of new effective methods of forming the main magnetic flux using amorphous ferromagnetic materials and the use of combined designs of power transformers combining the above solutions.

The reserve for increasing the propulsive complex of the icebreaker (PCL) and ice-class vessels is to increase the influence of the hull coefficient, and the energy efficiency of the PCL consists in maintaining the torque of the HD at a constant level. The coordination of the propeller (GW) with the main engine (GD) is carried out by changing the pitch and diameter of the screw. In practice, the coordination of the GW with the GD is carried out by changing the pitch of the screw with its diameter unchanged. One of the most effective ways to increase the ice penetration of icebreakers and ice-class vessels is the use of screw-steering columns (VRCS), which are installed both at the stern and at the bow of the vessel. The KM-DRC complex implemented in the KGNC turns the SRC into an "intelligent" control tool capable of assessing its operating mode and technical condition and informing the crew and the ship's information and control systems about it.

Currently, the actual problem of choosing methods for monitoring the insulation of open-pit distribution networks (ODN) with a voltage above 1000 V with an isolated neutral is highlighted. As a result, this article discusses known methods for controlling the isolation of ODN. The purpose of this article is to evaluate the periodic and continuous monitoring isolation of ODN.