Answer / nasseem

Out of step means that the Two transformers at different tap.
i.e. TR-1 at tap n and TR-2 at tap n+1 or n-1.
And as you know the two transformers should have same tap
"if the two transformers have same tap size i.e 1.25% for
example" when it operated in parallel to prevent the
circulation current between the two transformers.

So it seems in your case if we assume TR-1 is master and
TR-2 is follower TR-1 change its tap position while TR-2
still at it is original tap.

Answer / karthik

For details of the parallel operation of transformer refer
the website:
http://nptel.iitm.ac.in/courses/IIT-MADRAS/Electrical_Machines_I/pdfs/1_14.pdf

According to the literature the cause for the out of step
operation maybe due to
1)Change in voltage ratio
2)Change of polarity

Answer / arun kumar

Out step alrm occurs when the tap changer goes to maximum /
minum tap position

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