Practical recommendations for determining the power of a matching transformer for the operation of anchor-mooring mechanisms

A method for selecting anchor-mooring mechanisms based on the generalized characteristics obtained as a result of calculation is proposed, in conditions of a shortage of ship equipment. The article considers electric drives of anchor-mooring mechanisms based on asynchronous electric motors and reveals that some of them do not have the ability to switch the stator winding connection scheme in the terminal box. It is proposed to connect the winch electric drive through a matching transformer in case of a mismatch between the supply voltage of the electric drive and the ship's network. A single-line diagram is given, including a ship generator with a load, a matching transformer and an electric motor of the winch drive. The operating modes of the winch electric drive are analyzed: lose/take in and park under current, and an explanation is given regarding the calculation and modeling of the winch drive power supply system. It is said that the modeling of the system was performed using a simulation model previously developed by the authors. The power ranges of generators, matching transformers and electric motors for which the simulation was performed are given. The values of the maximum voltage drop at the start of the electric drive are determined, both for the ship's network voltage and for the supply voltage of the electric motor. The dependences for the power supply system with different values of the electric motor and transformer power at different generator loads, constructed based on the results of the analysis of transient processes, are given. A generalized assessment of the obtained dependencies is given, as well as recommendations for their application when selecting the winch power and determining the required power of the matching transformer, taking into account the requirements established by the designer and the Russian Classification Society. Conclusions are made and the practical value of the work at the design stage during the modernization of anchor and mooring winches is substantiated.