What are standard Transmission and Distribution voltages?

Electrical Engineering Transmission & Distribution
1

Primary Transmission: 66 kV, 132 KV, 220 kV and 400 kV

Secondary Transmission: 33 kV

Primary Distribution: 11 kV, 3-phase, 3-wire

Secondary Distribution: 400 V between two phases (3-phase, 4-wire) and 230 V between any one phase and neutral