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An Investigation on the Fault Currents in 22.9 kV Distribution System Due to the Increased Capacity and Operating Conditions of Power Transformers in 154 kV Substation  

Cho, Seong-Soo (한전 전력연구원 배전연구소)
Han, Sang-Ok (충남대학교 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.57, no.3, 2008 , pp. 302-310 More about this Journal
Abstract
In order to evaluate the nominal rating of breakers in distribution system due to the increased capacity and operating conditions of power transformers in 154 kV substation, the fault currents in distribution system were calculated by the conventional method and simulations of PSCAD/EMTDC program. Consequently, under the condition of the parallel operation of transformers, the fault currents exceed the nominal current of the breakers in some areas. Without NGR at the secondary neutral of the transformer, the current of single line-to-ground fault was bigger than that of 3-phase fault. Therefore, the results clearly show that the measures to limit the fault currents in distribution system are needed when the increased capacity of power transformers is introduced into 154 kV substation.
Keywords
Power Transformer; NGR; Nominal Interruption Current; Fault Currents;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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