Production includes different processes as follows-

Core Assembly (CA)

Core of a transformer is similar to the heart to a living being. Considering its importance, many issues are kept in mind for design like manufacturing functional reliability, longer service life, economy etc. Due weightage is given for careful selection of proper material & optimization of the shape of this unit. The efficiency of the Transformer depends entirely on this crucial component.

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a) HT and LT Windings-

The Windings allow the flow of oil around the conductor in between sections. These Windings are made of high grade electrolytic copper, which are designed to optimize thermal, mechanical, electrical stresses depending upon the current & voltage requirements. Depending on the specific design criteria-spiral, cross-over, helical & disk type windings are used. The machines for windings are equipped with different speed gears ensure the proper tension is maintained on the windings. In order to give the windings extra strength & axial cooling of the ducts, dove tail key spaces are maintained.


b) Core Coil Assembly(CCA)-

This plays a major role in space utilization, compactness, ease of transportability, handling & installation. Every care is taken for judicious space utilization without compromising the functional efficiency. Establishing a proper production line in assembly shop always helps in obtaining high production rate. CCA is the assembly of core and coil together.

c) Vaccum Drying-

Vaccum Drying is the most important process to get the appropriate insulation level, hence to get that the transformer was heat up in a Vaccum Drying Oven at a specified temperature to attain the insulation resistance.

d) Tank Fabrication-

The corrosion due to presence of moisture in the environment, brittleness of material due to influence of various gases, the formation of rust flakes, etc is not desirable on the surface of the transformer tank. These will have adverse effects on surfaces & ultimately lead to shortening of service life. The sand blasting is an effective process which helps in removal of harmful rust flakes. The proper painting gives aesthetic look of assemblage. It increases the service life of the Transformer by insuring protection against undesirable influences of the environment. Tank fabrication includes various steps like sheet cutting as per given dimensions by design dept. , Sand blasting is done to resist the transformer from corrosion, leakage testing for leakage purpose, final painting.


e) Box up-

After ensuring that the active part is fully dry & moisture free, it is lowered inside a suitably designed & fabricated mild steel tank. These tanks are thoroughly cleaned & painted before testing, are filled in with freshly filtered oil. The connections to LV & HV terminals are made as per drawings & all relevant parts fitted in before the Transformer is sent for testing.


NTPL has crossed national boundaries to serve international market in very short span of time. We already Test our product to Nigeria, Bangladesh, Nepal, Ghana etc. And also provide required support to international client.
Successful Testing of 10/14 KVA, 33/11.55 KV Power Transformer to Bangladesh.