It is true, the weak grid and the 10MVA transformer do limit the inrush current. Regardless the inrush current will stress the 10MVA transformer greatly and cause severe voltage drops through the grid.
An 100ohm resistor was choses a bit arbitrary and a quick EMT simulation shows inrush...
Actually no load current is 0.2% -> 5A and voltage drop over 100ohm resistor will be 500V, so not really an issue for this setup.
Could there be any other reasons for not using a permanent series resistor in this setup?
Im getting about 2 - 5 kV (assuming 1-2% magnetisation current)so it might be wise to reduce the resistor . Otherwise, are there any issues to be worried about?
I am looking into limiting the inrush current as much as possible.
The 150 MVA transformer is 33/150 kV and is to be energized from the 33kV side. The transformer is energized for testing purposes only and will never be loaded.
It is being energized from a relatively week grid, through a...
