Type of Document	Master's Thesis
Author	Meadowcroft, Brian K
Author's Email Address	bmeadow@vt.edu
URN	etd-05192010-105608
Title	Hidden Failures in Shipboard Electrical Integrated Propulsion Plants
Degree	Master of Science
Department	Electrical and Computer Engineering
Advisory Committee	Advisor Name Title Centeno, Virgilio A. Committee Co-Chair De La Ree Lopez, Jaime Committee Co-Chair Conners, Richard W. Committee Member
Keywords	Adaptive Protection Integrated Power System Hidden Failures Shipboard Power Systems Integrated Propulsion Plant
Date of Defense	2010-05-05
Availability	restricted
Abstract The differences between shipboard and land based power systems are explored to support the main focus of this work. A model was developed for simulating hidden failures on shipboard integrated propulsion plants, IPP. The model was then used to evaluate the segregation of the IPP high voltage, HV, buses in a similar fashion as a shipboard firemain. The HV buses were segregated when loss of propulsion power would put the ship as risk. This new treatment reduces the region of vulnerability by providing a high impedance boundary that limits the effects of a hidden failure of a current magnitude or differential based protective element, without the installation of any additional hardware or software. It is shown that this protection could be further improved through the use of a simple adaptive protection scheme that disarms unneeded protective elements in certain configurations.
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