Abstract
As concerns faults analysis in transient stability study, balanced fault condition such as 3-lines grounded has been adapted for long time in Japan. So transient stability software calculating only balanced fault has been utilized. However, with the advance of system protective control technologies such as multi-phase reclosing system for faulted transmission line, the stability software are needed which enable to calculate unbalanced faults including multiple faults conditions.
This report presents the newly developed calculation method of system faults which enable to calculate unbalanced single or multiple faults with the addition of balanced faults, and the validity of presented method was shown through the comparison to the results of test simulator. Moreover the report describes how transient stability limits are difierent for various faults conditions.
