Single Line to Ground Fault (SLG)

answered 2016-10-07 16:21:42 -0500

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To simulate an single line to ground fault in dynamic simulation you need to use a fault impedance equal to the Thevenin impedance in zero and negative sequence at the faulted bus.

If the saved case do not include sequence data you have to calculate the impedance yourself and enter the value (X0 + X2) as fault impedance. PSS/E do not model neqative and zero sequence in dynamic simulations, but the positive sequence voltage will be correct during the single line to ground fault.

If zero and negative sequence data are present in the case it is just to use disturbance "Calculate and apply unbalanced bus fault..." directly in the dynamic simulation, and PSS/E will calculate the equivalent fault impedance automatically.

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thank you!

Power_System_Engineer ( 2016-10-11 07:56:16 -0500 )edit

Thank you very much for your answer. For line to ground fault dynamic simulation it'is clear. However, is there a method for dynamic simulation of a line-to-line fault?

adnene ( 2019-09-04 04:04:12 -0500 )edit

Hello perolofl. I have the zero and negative sequence data in .sav file. When i choose "Calculate and apply unbalanced bus fault" in the dynamic simulation, R and X do not have values. What am i doing wrong?

dsam ( 2021-05-21 13:00:59 -0500 )edit

Which R and X do not have values? Resistance and reactance of L-G fault impedance shall be 0 for solid faults.Is a shunt added at the faulted bus when you click OK?

perolofl ( 2021-05-22 02:35:51 -0500 )edit

When i put OK, the faulted bus is added in fixed switched. Only this happen.

dsam ( 2021-05-22 07:05:41 -0500 )edit

The shunt represents the unbalanced faults. Just continue the simulation!

perolofl ( 2021-05-22 08:17:43 -0500 )edit

Thank you Perololf. I don’t know where I can see if a shunt is added at the fault bus after the simulation.

dsam ( 2021-05-24 06:55:00 -0500 )edit

The shunt is removed at fault clearing!!! Check the content of the progress window.

perolofl ( 2021-05-24 07:02:59 -0500 )edit

When i click OK is appeared this message https://prnt.sc/13d7vfm. So i think that this is ok.

dsam ( 2021-05-24 16:30:25 -0500 )edit

Yes, it is correct. The fault is represented with a shunt of 62 MW and -268 Mvar. Plot the bus voltage and you will see the voltage drop during the short circuit.

perolofl ( 2021-05-25 12:53:09 -0500 )edit

Thank you Perolofl.

dsam ( 2021-05-26 15:42:39 -0500 )edit

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