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1. (WO2015043644) METHOD FOR IDENTIFYING A FAULTED DC POWER TRANSMISSION MEDIUM IN A MULTI-TERMINAL DC ELECTRICAL NETWORK

Pub. No.:    WO/2015/043644    International Application No.:    PCT/EP2013/070131
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Fri Sep 27 01:59:59 CEST 2013
IPC: H02H 7/26
H02H 7/28
Applicants: GENERAL ELECTRIC TECHNOLOGY GMBH
Inventors: BAZARGAN, Masoud
MALEKA, Kyriaki
Title: METHOD FOR IDENTIFYING A FAULTED DC POWER TRANSMISSION MEDIUM IN A MULTI-TERMINAL DC ELECTRICAL NETWORK
Abstract:
A method for identifying a faulted DC power transmission medium in a multi-terminal DC electrical network (20), the DC electrical network (20) including a plurality of terminals (T1,T2,T3,T4), each terminal (T1,T2,T3,T4) being connected to at least one other terminal via a respective one of a plurality of DC power transmission media (L1,L2,L3,L4,L5), the method comprising the steps of: (a) detecting a fault occuring in the plurality of DC power transmission media (L1,L2,L3,L4,L5); (b) after detecting the fault, measuring a surge arrival time at each terminal (T1,T2,T3,T4), each surge arrival time being the difference between the time of detecting the fault and the time of arrival of an electrical wave surge at the corresponding terminal (T1,T2,T3,T4), the electrical wave surge being generated by the fault; (c) comparing the surge arrival time at each terminal (T1,T2,T3,T4) with the surge arrival time at at least one other terminal (T1,T2,T3,T4) to identify the or each DC power transmission medium (L1,L2,L3,L4,L5) in which the fault is not located; (d) allocating a healthy status to the or each DC power transmission medium (L1,L2,L3,L4,L5) in which the fault is not located; (e) identifying the faulted DC power transmission medium as being the DC power transmission medium (L1,L2,L3,L4,L5) without a healthy status or among a plurality of DC power transmission media (L1,L2,L3,L4,L5) without a healthy status.