Abstract
To control the intensity of the light flux when fishing saury it is necessary to widely change the voltage of the lighting fishing equipment. It is reasonable to carry out this by controlling additionally installed thyristor regulators supplying individual symmetric three-phase groups of light sources that will ensure balanced loading of the synchronous generator stator windings. In this research the features of using a thyristor voltage regulator in a four-wire system of ship power supply are studied based on mathematical analysis, conclusions are made using computer modeling and the use of current limiting reactors is justified.
Highlights
A lighting equipment on modern ships is effectively used while shipboard cone purse net fishing and while fishing with the help of fish pump equipment.A lighting equipment while shipboard purse seining is used for fish detection, fish attraction to the ship, moving the fish from one shipboard to another one, where the purse seine is fixed, fish concentration in purse seine area
Saury is attracted by the overwater lighting lamp to the non-operational board side and is shifted to the operational board side, where the purse seine is fixed
The results of computer modeling showed that to define the calculated parameters of impedor elements, connected to the zero wire, we have to choose a relative rated frequency i corresponding to the minimum weight and dimensional characteristics and sufficient current drop INo, to identify the reactor inductance and capacitor capacity, and, by changing the angle, we have to find the maximum of voltage capacitor with single phase load of synchronous generator on one lamp and a zero wire current with = 0
Summary
A lighting equipment while shipboard purse seining is used for fish detection, fish attraction to the ship, moving the fish from one shipboard to another one, where the purse seine is fixed, fish concentration in purse seine area. To detect saury and to shift it to the area of other above-water equipment, they install on the ship about three searchlights with a capacity of 1-3 kW each. To detect fish low-angle dispersion searchlights with major range coverage are used, and to shift fish closer to the shipboard they use high angle dispersion searchlights. Saury is attracted by the overwater lighting lamp to the non-operational board side and is shifted to the operational board side, where the purse seine is fixed. The boat boom construction ensures fixing the lamps on a proper distance from the shipboard, changing the angle of lam declination, etc
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