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L-L-G Model Inside PSSE

asked 2018-03-28 19:45:54 -0500

haveityourwa gravatar image

Hey guys, I am trying to simulate a L-L-G fault inside both PSSE and PSCAD however the information that I have found inside PSSE documents does not seem to achieve the same result inside PSSE. Inside the POM on page 685 (V32) or 9-14 for page numbers. This indicates that the unbalanced fault appears like so.

However when making a fault using the command below.

psspy.distscmufault([0, 1, 2, fault_bus], [23/(66^2/100), 0, 0, 0])

My understanding is that this would indicate a fault like below.

Please let me know if this is an incorrect assumption.

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answered 2018-04-04 10:43:30 -0500

perolofl gravatar image

updated 2018-04-04 13:19:34 -0500

Are you referring to this figure?

image description

I believe you have 46 ohm fault impedance between the phases and 0 ohm to ground at the mid-point.

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Thanks for the reply that is the image i am referring to and my assumption was the same that the fault impedance between the phases would be 46 ohms, however when trying to simulate the same fault inside PSCAD as above the resulting voltage drop was not equal.

haveityourwa gravatar imagehaveityourwa ( 2018-04-04 19:40:51 -0500 )edit

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Asked: 2018-03-28 19:45:54 -0500

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Last updated: Apr 04 '18