The 60-cycle primary transmission system of the Milwaukee Electric Railway and light company

THE PRIMARY transmission system described in detail in this paper operates at 132 kv. and 66 kv. to transmit bulk energy from generating stations to step-down substations, and to interconnect the system of the Milwaukee Electric Railway and Light Company with hydroelectric plants in the northern peninsula of Michigan. The system is divided into power areas which are served directly from a generating station or from a step-down substation located near the load center of the area. Energy is distributed from these points over secondary transmission lines.