# How to implement Voltage dip by using Bus Fault during dynamic simulation?

I build a SMIB to do the dynamic simulation.

During the simulation, I need to apply a Voltage dip(from 1PU to 0.7PU) at 2s for the point of connection (for example bus 4).

If I don't use the playback model, how can I implement the Voltage dip? Is it possibel to apply the Bus Fault? Thank you very much.

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1. Calculate the three phase short circuit power at bus 4 with ASCC.

2. Simulate a bus fault and use the following fault admittance in MVA: B = dV * Sc.

If the short circuit power is 5000 MVA and the voltage drop is 0.3 pu (1pu-0.7pu) the fault admittance becomes 0.3 * 5000 = 1500 MVA. The following fault is applied:

This will roughly result in the wanted voltage dip to 0.7 pu. If needed, you can fine tune the fault admittance in order to come closer to 0.7 pu voltage.

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Thank you very much. It is very useful.

( 2019-10-10 23:57:30 -0500 )edit