Understanding transients: a conceptual interpretation

This paper provides a conceptual interpretation and a complementary understanding about power system transients through qualitative analysis. It introduces a few intuitive concepts by analyzing the transients of a two-winding transformer and a synchronous generator under a short circuit condition. A 90/spl deg/-lagging rule of thumb is also introduced to describe the d- and q-axes voltage equations of a synchronous generator. Using the introduced concepts, the transient mechanism can be well understood with clear physical meanings of every term, including the various time constants, in the solution formulas.