MVA is the correct representation. No one will mention the
transformer rating in mVA. If the rating is small then they
will represent in kVA even small they will represent in VA.
Not in mVA.
For Example 50VA can represent in 50VA only not in mVA
Both mVA and MVA are correct unit but depends upon the
rating of transformer
1. mVA mean milli volt ampere, used for small rating
transformer
2. MVA means megga volt ampere used for large rating
transformer
MV.A (not 'MVA') is the symbol for megavolt ampere.and in some low volatge cases we consider VA that is (Voltage Ampere). where VA is the true vector sum of circuit power or reactive power.
So, i thik it is true. NOT 'mVA' in case of transformer.
we all know that corona is nothing but ionization of air around
the conductor and there by allowing current to pass through
ionized air.but we are not getting any short circuit in between
the respective phases though the air turned as a conductive media
between them??