C.R.G.O (Cold-rolled grain-oriented sheet steel) is used for reducing the core losses in transformers.
Each type of steel has "grains" which consist of "domains". These "domains" are nothing but electrical charges oriented in any random direction.
Core loss= Hysteresis + Eddy Current Loss
Reduction of hysteresis loss:
(1)The size of the "grains" in a CRGO steel are purposely "grown" & made bigger & are about 10 times the size of the grains in regular steel.
(2)The grains in CRGO steels are all aligned almost parallel to the direction of rolling of the steel(i.e the length of the steel).
Reduction of eddy current loss:
A special carlite insulation coating on the steel being done so as to reduce the eddy current loss.
crgo is cold rolled grain oriented........steel used 4 tf is
cold rolled because it allows a much higher flux density of
around 1.8wb/m2 as compared to hot rolled steel...nd
therefore making it possible 2 minimize the core material nd
hence d core losses ..............