nation

's Best

lamination

solutions

Transformer core lamination for power & distribution transformer is manufactured from various grades of cold rolled grain oriented steel. Lamination in various shapes & size are slit and cut to required accurate geometrical shapes with 90° & 45° angle cutting system.

As manufacturing of transformer lamination involves a high degree of precision engineering, we always strive hard for crucial quality checks of burr level, stack height, dimension and required weight.

Transformer lamination can be of various sizes for single or three-phase transformers, made with overlap joints or step-lap joints (Cross/Longitudinal). They are cut, punched and V-notched in order to fit in a particular transformer by CNC - cut to length line. Cutting, Punching and Notching of different shapes of sheets are possible in width up to 1000 mm and length up to 5500 mm.

VSPL, with its integrated software to convert conventional design to Step-lap design, insists transformer manufacturers to opt for Step-lap design. Step-lap core design enables easier path for flux to travel at the joints and therefore reducing No Load Losses of transformer core by 5 to 8%. Our Core experts are always ready to assists in core assembly if required.

VSPL also offers excellent services in Lamination Assemblage as per the customer’s specifications for power and distribution transformers.

Lamination quality control checks are carried out frequently right through the starting of manufacturing process on machine to the dispatch. All the records are maintained separately for each drawing so the tracking of particular job can easily be available on our finger tips. As a final step of process, delivery inspector conducts the required inspections of Cut Lamination and releases it for the dispatch

Sr. No.	Characteristics	Acceptance Limit / Criteria
1	Width (mm)	0 to 100 (+/-0.15) 100 to 130 (+/-0.20) 230 to 380 (+/-0.25) 380 to 580 (+/-0.40) 580 to above (+/-0.50)
2	Thickness (mm)	±0.03mm
3	Edge Burrs (Micron) Thickness – mm Up to .23 .27 to .30 .35	Burrs Micron   10 15 20
4	Length (mm)	Upto 350 (+0.00 / -0.30) 350 to 1000 (+0.00 / -0.60) 1000 to 2000 (+0.00 / -1.00) 2000 and above (+0.00 / -2.00)
5	Edge Camber	For the material with a width greater than 150mm, edge camber shall not exceed 0.8mm for a length 1.5 meter
6	Wave Factor (i.e. Deviation from flatness)	For a material of width greater than 150mm the deviation from flatness expressed as a percentage shall not exceed 1.5%
7	Angle	+/- 5 Minutes
8	Stack Thickness of individual stack expect centre step Unclamped	+1 - 0 mm

Although we follow IS Standards, however our plant works at the most upgraded technology with far ahead stricter quality norms than above mentioned standards to ensure the best of customer's needs. Top