TRANSFORMERS

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4.0 TRANSFORMERS

The transformers shall be suitable for continuous operation on a 3 phase, 50 Hz electrical power distribution system with neutral earthing conditions and maximum phase fault levels as follows :-
11 Kv                            350 MVA

6.6 Kv                          150 MVA
3.3 Kv                             75 MVA
415 V                               31 MVA

They shall be fully tropicalised and suitable for continuous operation at an ambient temperature up to 40 degree Celsius, relative humidity up to 100%,isoceraunic level up to 200 days per annum and altitude up to 1000 metres above sea level.

4.1 TYPE OF TRANSFORMER

The transformers shall be oil-immersed naturally cooled and hermetically sealed type complying with BS 171 or IEC 76 and suitable for indoor duties. Unless otherwise specified, they shall be low loss, step-down type of distribution transformers fitted with skid type bases.


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