in transformer laminations and cores, we not only excel
but also deliver quality, with a stringent quality policy
in place, the Quality Assurance System followed by...

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Products: Transformer Core & Laminations

Transformer Core also known as ' STACKED TRANSFORMER CORE ' are manufactured by B. R. Industries Ltd. These laminations are manufactured for distribution and power transformers from 10 KVA to 250,000 KVA (250 MVA) and can be mitred ( 45° angle ), V - notched, punched with holes as per the customer's design, specification and requirement. These laminations are also deburred ( to remove burrs and give the optimum stacking factor ). These laminations meet the specified dimensional standards (as per our internal Quality acceptance criterion). We also manufacture longitudnal and horizontal step-lap cores to customer specification.

On customer's request and specification we can also provide fully assembled stacked core,with no load losses tested and appropriately packed and ready for insertion of LV and HV coils.

We manufacture Transformer Core laminations from Cold Rolled Grain Oriented (CRGO) steel in grades M2, M3, M4, M5, M6 and also the Hi-B CRGO grades of ZH, ZDKH, ZDMH, ORSI-H, TCH-O, TCH-1 etc. For more technical details on the various grades of CRGO steel.


Our Internal Standards & Normal Tolerances
Width (upto 150 mm) +0/-0.25 mm
(from 150 mm to 500 mm) +0/-0.3 mm
(more than 500 mm) +0/-0.5 mm
Length (upto 315 mm) +0/-0.4 mm
(from 315 mm to 1000 mm) +0/-0.6 mm
(from 1000 mm to 2000 mm) +0/-1 mm
(from 2000 mm to 4000 mm) +0/-1.6 mm
Angle +/-5 minutes
Edge Camber Max. 1.5 mm in 2000 mm length
Thickness +/-0.03 mm
Stacking factor 96% (for M-4 & M-5)
96.5% (for M-6)
Burr 25 Microns Max. or 10% of thickness, whichever is lesser
Insulation resistivity Min. 10 Ohm/sq. cm. as per Franklin method
  Transformer Core
  CRGO Strips & Slit Coils
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