Improved protection system for phase faults on marine vessels based on ratio between negative sequence and positive sequence of the fault current

Catalin-Iosif Ciontea, Qiteng Hong, Campbell Booth, Claus Leth Bak, Frede Blaabjerg, Kjeld Kilsgaard Madsen, Claes Høll Sterregaard

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)
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Abstract

This study presents a new method to protect the radial feeders on marine vessels. The proposed protection method is effective against phase–phase (PP) faults and is based on evaluation of the ratio between the negative sequence and positive sequence of the fault currents. It is shown that the magnitude of the introduced ratio increases significantly during the PP fault, hence indicating the fault presence in an electric network. Here, the theoretical background of the new method of protection is firstly discussed, based on which the new protection algorithm is described afterwards. The proposed algorithm is implemented in a programmable digital relay embedded in a hardware-in-the-loop (HIL) test set-up that emulates a typical maritime feeder using a real-time digital simulator. The HIL set-up allows testing of the new protection method under a wide range of faults and network conditions and the experimental results demonstrate its effectiveness in all scenarios conducted. The proposed protection method offers a solution to the protection challenges associated with variability of the short-circuit currents in radial feeders, advancing in this way the traditional mean of protection in maritime feeders, represented by overcurrent relays.
Original languageEnglish
JournalIET Electrical Systems in Transportation
Volume8
Issue number4
Pages (from-to)251-258
Number of pages8
ISSN2042-9738
DOIs
Publication statusPublished - Dec 2018

Keywords

  • Relay protection
  • Power system relaying
  • Short-circuit currents
  • Marine power systems;
  • Overcurrent protection
  • Fault currents

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