Question

CONSIDERA 3. BUS SYSTEM WITH THE following + MOTOR Z us INCLUDING GENERATOR INCLUDING CALTANCES EN 12 Jo.08 Jo.o4 10.12 1 10.06 ALL IN Pu Jo.04 0.06

please answer all parts:

Assume flat voltage profile. For a 3 phase balanced, solid fault at bus 3, calculate:
A) the fault current
B) fault voltages at each bus
C) if generator with Xg'' = 0.15 PU is connected to bus 1, calculate the fault current contribution of the generator

Answer 1

solution. Zusa of jo 12 joos joon jous jo. 12 jo .ob joon jo ob jo.us I → - Solid faint (ic. 3-phane fault) occur at bes . cas fauy current. I like 733 - where Vro pe fault voltage - at bus (3) Ipa 12.5 pe-90 pu

n we know that! any other gth bus if fault Cost fault voltage at - v - veg - Zx F where - - Vo = Prefault vollege of I bus la fault current ve 1 Lo-Z iz If - I lo' - jooyx 12.5L-99. TV : 0.5 lopu Va 1202 Zzz Ipa da jo 12x12,52-90 TV2 = 0.5 Laso su ] /v, so ( bесалце довга ац- си, а X2 ) 8 (c) Xg" = 0.15 pu Fault current contribution of the generator= If : * theon-v - 142 1401303063.33 -90* pu] Ia a Lloo - 0.5to - 3.33 L-go" pu 0.15