Relay protection for ladder-shaped shipboard transmission network with multiple modes

Abstract

This paper introduces the developing direction of power systems in future naval vessels, and summarizes the characters of present shipboard construction and protection. In order to find the most suitable protection scheme for future complicated systems, a ladder-shaped shipboard with multiple stations was simulated with software PSCAD/EMTDC. For comparison purposes, this paper discusses both the traditional shipboard power system protection and the longitudinal differential protection which is common in a land-based power system. It also analyzes how these protections work in different modes when a three-phase fault happens in different places at different time. A vector of the breakerspsila state is used to describe the changes of topology. From the simulation, the benefits and drawbacks of these protections used in such a system are spread out. This paper will give some suggestions for future researches on the shipboard power system protection.