Special features ::
1. Aluminium windings for Cast Resin Transformers
Aluminium conductors have been successfully utilized in the electrical industry for over 100 years. The use of Aluminium in electrical appliances has been recognized since the publication of 2nd edition of the National Electricity Code (NEC) in 1901.The use of Aluminum as conductor for Cast Resin Transformers in place of Copper Cast Resin Transformers is explained below considering the techno-commercial aspects:
1. Technical Aspects :
| S.no | Parameters | Copper | Aluminium | Additional Info./Calc. | Remarks |
|---|---|---|---|---|---|
| 1. | Coeff.of linear expansion | 17 x 10 -6 / K | 24 x 10 -6 / K | Resin - 30 x 10 -6 / K | Al & resin are compatible materials where chances of void creation & cracks during changing loads are min. as against with Cu & Resin. |
| 2. | Conductivity (σ) |
56 x 10 6 siemens/m | 35 x 10 6 siemens/m | 1.6 x 35 x 10 6 = 56 x 10 6 S/m |
A higher C.S. Area of Al conductor (1.6 times Cu Conductor) is provided to maintain the same conductivity & the resultant load losses. |
| 3. | Thermal Storage Capacity | 0.092 cal/gm/°C 8.9 gm/cm3 1 8.9 x 0.092 = 0.8188 |
0.214 cal/gm/°C 2.7 gm/cm3 1.6 0.214 x 2.7 x 1.6 = 0.9248 |
Thermal Storage Capacity Density C.S Area Factor(Ref.Sl.no. 2) Comparative Thermal Storage capacity | Al can withstand greater surge & overload current than equivalent Cu. |
2. Commercial Aspects :
Alumunium wound Cast Resin Transformers are usually 15-20% cheaper than equivalent Copper wound Cast Resin transformers with same losses and efficiencies. The life cycle of Aluminium Cast Resin Transformer is similar to Copper wound Cast Resin Transformers.
2. Why Foil Windings ?
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Our Products ::
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Low voltage transformers LV/LV –
- rating up to 2500 KVA nominal voltage up to 1.1 KV
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Distribution transformers MV/LV –
- rating up to 5000 KVA and nominal voltage up to 36 kV
Special Features ::
Aluminium conductors have been successfully utilized in the electrical industry for over 100 years.
The use of Aluminium in electrical appliances has been recognized since the publication of 2nd edition of the National Electricity Code (NEC) in 1901.