# L18 - ECE 524 Transients in Power Systems Session 18 Page...

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ECE 524: Transients in Power Systems Session 18; Page 1/10 Spring 2012 ECE 524: Lecture 18 Three phase TRV transients MVAR 1000kW  μ s 10 6 sec  Consider the three phase system shown below: 34.5kV VS UI NEU UI 12 MVAR U 2nF LOAD V LL 34.5kV  V m 2 3 V LL  V m 28.17 kV Z s j10 5 ohm  Q L 12MVAR  X L V LL 2 Q L  X L 99.19 Ω L ph X L 2 π 60 Hz  L ph 263.1 mH C ph 2nF  f n 1 2 π 1 L ph C ph  f n 6938.13 1 s T n 1 f n  T n 144.13 μ s Choose simulation time step: T n 30 4.8 μ s

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ECE 524: Transients in Power Systems Session 18; Page 2/10 Spring 2012 Case 1: Z n ohm  (f ile Example.pl4; x-v ar t) c:VSWA -LOADA c:VSWB -LOADB c:VSWC -LOADC 0.00 0.02 0.04 0.06 0.08 0.10 [s] -300 -200 -100 0 100 200 300 [A] Breaker currents (f ile Example.pl4; x-v ar t) v:NEU - 49.5 50.5 51.5 52.5 53.5 54.5 [ms] -30.0 -22.5 -15.0 -7.5 0.0 7.5 15.0 [kV] Neutral to ground voltage: (f ile Example.pl4; x-v ar t) v :LOADA -NEU v :LOADB -NEU v :LOADC -NEU 0.00 0.02 0.04 0.06 0.08 0.10 [s] -50.0 -37.5 -25.0 -12.5 0.0 12.5 25.0 37.5 50.0 [kV] Phase voltages
ECE 524: Transients in Power Systems Session 18; Page 3/10 Spring 2012 Phase voltage after first switch clears (f ile Example.pl4; x-v ar t)

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L18 - ECE 524 Transients in Power Systems Session 18 Page...

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