Question

A generator operating at 50 Hz. delivers 1 p.u. power to infinite bus through a transmission circuit in which resistance is ignored. A fault takes place reducing the max. power transferable to 0.5 p.u. and after the clearance of the fault it is 1.5 pu. calculate the critical clearing angle.

Answer 1

Answer:

Explanation:

A generator operating at 50 Hz delivers 1 pu power to an infinite bus through a transmission circuit in which resistance is ignored. A fault takes place reducing the maximum power transferable to 0.5 pu whereas before the fault, this power was 2.0 pu and after the clearance of the fault, it is 1.5 pu. Using equal area criterion, determine the critical clearing angle. Pmax I =2.0eu Prvax 1 = O'S PU Pmark als Pu Initial loading Pm = 1:0 Pu So = sin' PM Pmaa I & max = 1 - sin' Pm IPmax II Cos Scr = Pm Smak - So) - Pmax II cos so + Pmax II Cos Sman Pran 1 Pmax I Scr = ?