In this article, the protection design in a shipboard power system (SPS) with DC common bus distribution is evaluated. The goal is to compare two different approaches to calculate DC short-circuit currents and their outcoming influence in verifying the sensitivity of high-speed fuses. A dual-circuit modeling analysis is proposed for EMTP-ATP time-domain simulation: lumped RLC, and distributed parameters combined with non-linear inductances and frequency-dependent elements; and the calculation procedures proposed by IEC 61660–1. An adequate study case is introduced considering a small innovative vessel powered by fuel cells and batteries with DC architecture for the electrical propulsion plant. The fault study is carried out considering the ship operations at Harbour with the minimum available power source. Finally, this paper highlights the benefits or limitations of the two DC fault methodologies and analyses their suitability for feeder protection designing with high-speed fuses in the DC SPS.

在本文中，评估了具有直流公共母线配电的船载电源系统 (SPS) 中的保护设计。目标是比较计算直流短路电流的两种不同方法及其对验证高速熔断器灵敏度的影响。提出了一种用于 EMTP-ATP 时域仿真的双电路建模分析：集总 RLC，以及结合非线性电感和频率相关元件的分布式参数；以及 IEC 61660-1 提出的计算程序。介绍了一个充分的研究案例，考虑到由燃料电池和电池供电的小型创新船舶，用于电力推进装置的直流架构。故障研究是考虑到船舶在港口使用最小可用电源运行的情况下进行的。最后，