Vikarsh Stampings India Private Limited

Vikarsh Stampings India Private Limited

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Mitred Transformer Lamination

Our in-depth process knowledge as well as modern production facilities allow us to successfully meet the demands of Mitred Transformer Lamination. The technical expertise of our team allows us to manufacture these for a wide range of transformers ranging from 25 KVA to 75 MVA 'V' nothing and multi-holing as per customer requirements.

Specifications :

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Tolerance Chart For Crgo Laminations

THICKNESS + l- 0.02 mm. Total difference in thickness in a direction Perpendicular to rolling direction should not exceed 0.02 mm
LENGTH Upto 700mm + 0.0/ - 0.5mm
701 to 2000mm + 0.0 / -1.0mm
Over 2000 mm + 0.0 / - 1.5 mm
WIDTH Upto 150 mm +/- 0.2 mm
151 to 500 mm +/- 0.2 mm
501 mm and above +/- 0.3 mm
CAMBER 0.9 mm max. on a length of 2000 mm per side on surface table
V NOTCH 90 deg + / - 5 minutes
MITRED ANGLE 45 deg + / -5 minutes
HOLE DIAMETER + 0.10/-00 mm
STACKING FACTOR 95 % min. for 0.23mm thick material
96 % min. for 0.27 mm and 0.30 mm thick material
96.5 % min. for 0.35 mm thick material
INSULATION RESISTANCE Min. 10 ohms /cm² as per Franklin method described in IS 649 -1997
BURR 20 microns maximum
WEIGHT OF EACH STEP +0.5% TO 1.0% or as per customers requirements.
WATT LOSS / KG As per old AISI and SIS 601 the Watt Loss/Kg is as follows :-
M-3 - 0.77 watts/kg at1 .5T and 50 Hz
M-4 - 0.89 watts/kg at 1 .5T and 50 Hz
M-5 - 0.97 watts/kg at 1 .5T and 50 Hz
M-6 - 1.10 watts/kg at 1 .5T and 50 Hz
However, for the last couple of years the emphasis has shifted from the guaranteed watt loss at 1.5 T/50 Hz to the guaranteed watt loss at 1.7 T/50Hz.
Now the watt loss comprises the following in order given as per the following figures:-
Vikarsh Stampings India Private Limited

Step Lap Lamination

Few days back mitred "stacked core" designs superseded cores which used rectangular joints. The development of mitred corner joints and in particular yokes with "V" notches to locate the centre leg allowed less core steel to be used, thus reducing the cost of the transformer. Typically with overlap designs, sheets are laid in pairs (2 by 2 or 3 by 3). The choice is to make a balance between faster core building and the overall efficiency of the core. We offer step lap and step lap lamination

There has been a constant drive to reduce material and manufacturing costs in the design of distribution transformers. When considering the various material in a transformer of paramount importance is the overall cost of the core steel used. This cost is influence by a number of factors, namely the loss factor of the silicon steel, the weight required (affected by the loss factor of the silicon steel) and the design of the core. There are many permutations which can be played between the raw cost of silicon steel, its loss factor, the amount required in a core and hence the material cost of the core.

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About 30 years ago Westinghouse, in its research to reduce costs, invented a novel system of cross step-lap. In this design the overlap at the joints is much less than traditional overlap (3 - 5 mm compared to 10 -15 mm} but the shift progresses for 5 to 7 sheets before starting again. A key part of the Westinghouse design is the centre-leg where the notch in the yoke is progressively moved across the yoke according to the number of steps (the centre-leg length remains the same). There are three principle benefits of Westinghouse step-lap, firstly reduced material costs, as less core steel is required for the same losses, secondly faster assembly of the core and thirdly lower noise.

The building factor used with cores manufactured like this will be between 1.10 and 1.14. whereas hand cut cores will typically use building factors of between 1.25 and 1.30.

This means there is the potential to make a material saving of up to 20%

Winding on-the-leg allows even more material savings as the windings are that much closer to the core less copper (or aluminium) can be used.

Noise Reduction
An important benefit of step-lap cores is they exhibit lower noise compared to overlap cores. This can be particularly important as there is increasing requirement to reduces the noise of transformers.

Core Frame Assemblies

We offer clients high performance Transformer Cores, core frames, oriented core frame assemblies that find application in meeting the specific application demands of industrial and commercial transformers. These Core Frame Assemblies are also duly assembled and tested for no load losses with turns, which assure clients of their flawless and consistent performance. We have with us the cutting-edge technical expertise to meet the specific manufacturing demands of core frame assemblies. These are offered for a wide range of transformers starting from 25 KVA to 5 MVA. Further, the high-quality standards followed during the production stage also ensure optimum service life standards for core frame assemblies.

Miltered Lamination core frame assemblies upto 5 MVA with facilities to test no load losses off power analysis of our works.

Features :

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Product Range

Nanocrystalline Toroidal Cores And Ribbons|  Mitred Transformer Lamination  |  Step Lap  |  Toroidal Cores (Ring Cores)  |  Core Frame Assemblies
Rectangular Strips in CRGO and CRNO  |  Slit Coil  |  Taping and Copper Winding  

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