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I can calculate the current on primary side of a transformer if i know the seconday current and voltage and primaty voltage.

but what will be the effect on the primary current if there is a reactor on the primary side and there is provision to change this reactor?

on various reactance value what will be the current in primary side with known secodary current/voltage and primary current?

>I can calculate the current on primary
>side of a transformer if i know the
>seconday current and voltage and
>primaty voltage.

>but what will be the effect on the
>primary current if there is a reactor
>on the primary side and there is
>provision to change this reactor?

The effect is only voltage drop across the reactor. During reactor sizing we already known this situation.

>on various reactance value what will be
>the current in primary side with known
>secodary current/voltage and primary
>current?

The transformer rating will not change, the calculation formula also not change.
Short-circuit current will be changed (Source Transformer-reactor- fault location) and also transformer inrush current become lower (depends on reactor location let say source-reactor and transformer)

thanks ,
the reactor is itself inside the transformer and can be changed with OLTC.