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What is the difference between CRNO and CRGO in an
transformer and what is the advantages of these two.
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Answer Posted / zahid noor
CRGO & CRNO are both electrical steel grades used for
stampings & cores of electrical Transformers & other
electrical appliances.
CRNO is cold rolled Non Grain Oriented steel laminations ,
thickness available is not less than .50mm as compared
to .27 of CRGO, & Hence the losses in CRNO are more than
four times of CRGO.CRNGO Non oriented fully processed
steels are iron-silicon alloys with varying silicon
contents and have similar magnetic properties in all
directions in the plan of the sheet. They are principally
used for motors, generators, alternators, ballasts, small
transformers and a variety of other electromagnetic
applications.
WHERE AS CRGO is used for Distribution as well as Power
Transformers due to its low loss characteristics.
CRGO or Cold Rolled Grain Oriented Steel is available in
various grades (generally called M3, M4, M5 & M6). Major
international standards such as Japanese (JIS), American
(ASTM), German (DIN) and British Standards are AVAILABLE
which specify grade, thickness, Watt Losses and Magnetic
Flux density.Conventional CRGO materials (M4, M5, M6) are
used regularly for cores in Transformers.
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