engleski

Temperature Rise Prediction in Three-Phase Busbar Systems - A Step in Preparation for Medium-voltage Switchgear Type Testing

Optimization of a ship's high voltage (HV) switchboard at the individual switchgear level with the aim of improving the overall energy efficiency is achieved by reducing various influencing factors. The optimized switchgear design still has to meet the conditions regarding thermal, electrical and mechanical stress. Therefore, new designs of AirInsulated Switchgear (AIS) are subjected to various type tests to verify their compliance with the relevant standards before they can be used in an electrical system. In preparation for type testing, various computer- based simulations must be performed to predict the behaviour of the proposed design. These predictions help to keep the overall production cost to a minimum, as various problems that lead to type test failure can be identified in advance. One of the type tests to be fulfilled is the temperature rise test, where the thermal stress of the busbars at rated current is analysed, with rise limits defined according to IEC 62271-1. In this paper, the temperature rise analysis of several selected three-phase busbar systems for use in a newly proposed AIS design using FEM and CFD is presented. In order to save computational time, simplified models are used for the first selection, where the electromagnetic losses of the busbars are used as the source of heating and natural air convection is also considered. The objective of the simulation is to select a busbar configuration that has the lowest temperature rise and electromagnetic losses, which ultimately contributes to the overall energy efficiency of a ship's electrical distribution system.

Medium voltage switchgear, Energy efficiency, Temperature rise, Busbars, Ship electrical system

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