Discussion
The output voltage of the transformer for primary distribution is:
Answer: A
The output of the transformer used for primary distribution is 11 kV. Electricity is generated at about 11 kV, stepped up to 132 kV or more for transmission, and then stepped down at the receiving station to 33 kV for sub-transmission and to 11 kV for primary distribution, which feeds the distribution transformers that supply 400 V (or 230 V) to consumers. The values 33 kV, 66 kV and 132 kV belong to sub-transmission and transmission levels, not to primary distribution.
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