Protective Practices as a Criterion for High-Voltage Transmission Design [includes discussion]

Technological advances and closely engineered practices have kept the cost of high-voltage transmission from rising in a period of inflation. By applying the experiences that have contributed to this economy into the higher voltages, design is under way to transmit large blocks of power at 345 kv on the Bonneville Power Administration system in the Pacific Northwest. Practices that have made this possible include revised concepts of protection from abnormal voltages, always an item of high cost, and one which warrants continued study.