Short-circuit Current Calculation Application for A.C 3 Phase on Marine and Mobile Offshore Installations Based on IEC-61363 Standard

Abstract

As part of increasing marine vessel and mobile offshore installation safety, The Safety of Life at Sea (SOLAS), an International Maritime Organization (IMO) publication required that electrical installations in ships shall be protected against short circuit. The short circuit calculation shall be performed properly to obtain the appropriate protection device. Since the methods of calculation used by designer are mostly varied, the amount of time needed for verification by Classification Society reviewer will be increased if both of parties used different techniques. Moreover, the manual calculation data (by using Microsoft Excel, etc.) will not be saved in appropriate order, according to ship's name where such historical technical data might be needed in case of another modification or electrical equipment replacement in the future. Therefore, this research is aimed at creating a short circuit calculation software, in which the calculation data will be saved as historical record in an IMO number group and the method of calculation will be technically uniform. The calculation is intended to obtain the short circuit current of a.c three phase based on IEC 61363 standard. The calculated short circuit current comprises of three components, a.c component (Iac), d.c component (Idc) and peak current (Ip). The output of calculation can also be used as the way to determine the breaking and making capacity current in selection of protection device.