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CRGO Steel - Handle with care

The earliest process to manufacture Cold Rolled Grain Oriented Electrical Steel, popularly known as CRGO, was first patented 70 years ago in 1933 in USA. The earliest grades of CRGO were known as M10, (approx. 1.00 watts/lb. at 1.5T/60Hz) and M9 (approx.0.90 watts/lb. at 1.5T/60Hz).

Transformer core ordering- by Stack height, number of sheets/books or Weight?

In any Power Transformer manufacturing Company, should the core be ordered on stack height (which is directly proportional to the cross sectional area of the core and therefore inversely proportional to the flux density), or on the number of sheets in each leg (which would enable production to efficiently assemble the core without shortages or mismatches in leg heights) or should it be ordered on weight basis (which would enable purchase to effectively control the costs).

Reducing Building Factor by Using Step Lap (SL) Laminations

A proper value of the Building factor (BF) is important while calculating the No-Load Loss (NLL) of any power or distribution transformer. It is an empirically derived factor which is based on the experience of the Transformer Manufacturer (TM) and ranges from 1.08 to 1.35 for three phase, three limb cores. Step Lap (SL) construction of transformer core instead of conventional but type construction (or Non Step Lap (NSL) type) which is still widely used by TMs in India, has been successfully used by various TMs world over, to reduce the Building factor in Transformer cores by 5 to 8%, reduce the No Load current and the noise level relative to conventionally stacked NSL cores. This paper explains how SL laminations reduce the No Load Loss in a transformer by considering the specifics of magnetic Flux transfer in joints areas of a SL core versus a NSL transformer core. By 1947, the first catalogue containing design curves and other essential information on grain oriented steels was published.

CRGO Laminations: Inhouse manufacture or Outsourcing?

The earliest process to manufacture Cold Rolled Grain Oriented Electrical Steel, popularly known as CRGO, was first CRGO Laminations- Inhouse manufacture or Outsourcing?

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