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Power transformers are used in transmission network of higher voltages for step-up and step down application (400 kV,200 kV,110 kV,66 kV,33kV) and are generally rated above200MVA
Distribution transformers are used for lower voltage distribution networks as a means to end user connectivity. (11kV,6.6 kV,3.3 kV,440V,230V) and are generally rated less than200 MVA
Power transformers are designed for high voltage, they have complex structures, high quality cooling system, while distribution transformers are relatively small in size, simple in structure and designed for love voltage, i.e:220 V phase voltage and440 V line voltage.
In case of primary distribution the voltage is up to11 KV. Primary distribution is mainly used for industrial load.
The power transforemrs are used for High voltage and Distribution TF are used to Low voltage saide coustumers