DocumentCode :
535705
Title :
No-load energization of very long EHV mixed overhead-cable lines
Author :
Ippolito, Mariano G. ; Massaro, Fabio ; Morana, Giuseppe ; Musca, Rossano
Author_Institution :
DIEET, Univ. di Palermo, Palermo, Italy
fYear :
2010
fDate :
Aug. 31 2010-Sept. 3 2010
Firstpage :
1
Lastpage :
6
Abstract :
Recently, in many countries EHV AC cable lines are used as means to overcome the difficulties in construction of new transmission lines. However, the coexistence of overhead and cable lines in transmission systems, in the so called “mixed” lines, raises a number of issues regarding the behaviour of such systems both in transient and steady-state. In particular, with the increment of the operating voltage of transmission systems, the behaviour of such mixed systems during switching operation becomes of special interest. The purpose of this study is to investigate the no-load energization of very long EHV mixed lines in two main configurations, both characterized by an high difference in the lengths of the first and the last stretch. The work addresses this issue from two different aspects: the switching transient and the quasi-steady state condition. The analysis will show the suitability of those configurations which have the majority of cable away from switching end, even if some important observations in transient analysis will be pointed out, especially regarding the “best end” switching issue: in particular, difference in length between the first and the last stretch affects the multiple reflections and the equivalent two-port circuit constants, then significantly influencing the opened end overvoltages.
Keywords :
power cables; power overhead lines; transient analysis; equivalent two-port circuit constants; no-load energization; opened end overvoltages; quasi-steady state condition; switching transient; transient analysis; transmission lines; transmission systems; very long EHV mixed overhead-cable lines; Power cables; Reflection; Surges; Switches; Transient analysis; Mixed Lines; No-Load Energization; Switching Overvoltages;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Universities Power Engineering Conference (UPEC), 2010 45th International
Conference_Location :
Cardiff, Wales
Print_ISBN :
978-1-4244-7667-1
Type :
conf
Filename :
5649950
Link To Document :
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