Question

3. A generator is feeding an infinite bus through transfer line J. The generator's power is p-0.8 p.u and cosq-0.85ind. In point A there is a zero resistant fault that causes the breakers Kı and K2to open 0.1 s after the fault. We shall presume that the fault is cleared while the breakers are open. Calculate: a) the power-angle at which the breakers must be re-closed at the latest to maintain stability the maximum time from breaker opening to re-closing b) M, K, K2 M2 다-+-J0,15 Ху 0,10 x'd 0.30 хм,-0,12 H-5MWs u 1,0 MVA

Answer 1

Ver) rnet &o = S2.YL

Mlosimem tie mpnn to re-Chnig aximum t. ニ 9サー tr. (24s xro4-12-.tot. )1

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