describe a stabilised transformer
I'm only guessing that you may be reffering to a transformer that is equipped with taps on the windings that allow for +/- 10% votage changes on the secondary to maintain a fixed voltage when the input voltage (primary) varies or the load on the secondary varies. Thus stabilizing the voltage to the load. These are called TCUL (tap changeing under load) or LTC (load tap changing)-the more common term-transformers.
A stablized Transformer is to step dwon or step up the voltage which is called stabilizer also.
