I. Introduction

The issue of energy efficiency in water transport has become increasingly important over the years [1]. One of the methods in shipping is the replacement of heavy fuel oils with gas oils and the introduction of LPG and LNG engines [2]. Another particularly popular method is the introduction of electric propulsion drives. Electric motors have much higher efficiency, low vibrations and noise and precise control. Electric azimuth thrusters are also used in systems for dynamic positioning of the ship. Due to the high power of propulsion engines up to , it is necessary to introduce systems operating at high voltage. Modern ships use medium voltages of 6. and . Power transformers as well as the other electrical equipment onboard generate industrial (60 Hz) frequency electromagnetic fields (EMFs). Due to the characteristics of ship spaces and the lack of large areas (as in industry), a detailed study of the magnitude of the electromagnetic field created and the introduction of adequate protections for the serving ship personnel are required.