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Why can not apply unbalanced fault in transformer branch?

asked 2018-05-20 21:59:45 -0500

AlexYang gravatar image

I want to set unbalanced fault in transformer branch with different position, but I find in option [Branch Unbalance], there are only None-Transformer buses can be selected.

So I cannot do what I want? Thanks for helping.

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answered 2018-05-21 03:52:37 -0500

perolofl gravatar image

No, you cannot simulate an in-line fault for a transformer!

Maybe a split of the transformer into two transformers in series with a dummy bus in-between would solve the problem. Assign a bus fault at the dummy bus to represent an internal transformer fault.

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I don't want to impose an internal transformer fault, I want to think of the transformer branch as a transmission line with a certain length. Is it possible to understand that the transformer branch has no length, it represents only the transformer itself, so there is no concept of “position”

AlexYang gravatar imageAlexYang ( 2018-05-21 19:58:17 -0500 )edit

What kind of fault do you want to simulate? What do you mean with "different postion" if it is not an internal fault?

perolofl gravatar imageperolofl ( 2018-05-22 01:57:26 -0500 )edit

for example, if I set unbalanced fault in non-transformer branch, I can choose fault position like in 30% bettween bus i and bus j: i ---------30%----------------------------j

AlexYang gravatar imageAlexYang ( 2018-05-22 02:15:48 -0500 )edit

My thought is, look transformer branch as: i-------------------------trans--------------------------j, then I can choose fault position in line.

AlexYang gravatar imageAlexYang ( 2018-05-22 02:17:19 -0500 )edit

That is exactly what my answer is proposing. Split the transformer with 30% of impedance in first transformer and 70% in the second and apply the bus fault inbetween!

perolofl gravatar imageperolofl ( 2018-05-22 03:00:07 -0500 )edit

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Asked: 2018-05-20 21:59:45 -0500

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Last updated: May 21 '18