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I need a three-phase stabiliser. Which is the most suitable type :
"T" model with voltage regulation on the average of the three phases or
"Y" model with independent regulation on the three phases ?
It depends on the load to be powered.
"T" stabilisers are suitable for three-phase loads, well balanced input lines and a maximum load unbalance among phases of 50%.
"Y" stabilisers are suitable to have in output three single-phase lines perfectly balanced even in presence of unbalanced input lines. These stabilisers withstand load unbalances up to 100%.
Practically, they are made up of three single-phase, star-connected units. The presence of neutral is essential.
Could I power a "T" stabiliser in presence of a three-phase input line with neutral ?
[read the answer]Yes, of course, neutral is not essential for the correct operation of "T" stabilisers.
The input neutral has been short-circuited to the output neutral.
Or the neutral is of the "feedthrough" type.