Engineering and electric transmission
Transmission lines carry large amounts of electricity at high voltages across long distances and are considered bulk power delivery systems. Once the electricity has been generated at a power facility, it is carried to a substation by a transmission line and then to residential and business consumers via distribution power lines. Voltages on a transmission line typically range from 115 to 500 kV. Distribution lines carry the energy at lower voltages (12.5 to 34.5 kV) until it reaches a small transformer that converts it to a voltage of 110 and 220 volts, suitable for consumer use.
Design and Construction
The transmission line would be upgraded to 230 kV using primarily wooden H-frame structures and some self-supporting steel structures. The H-frame structures would be approximately 25 feet taller and 10 feet wider than the existing structures and would require an additional 50 feet of right-of-way for a total of 150 feet.
Electric Field Information
Linear metallic facilities such as pipelines or fences that are relatively close and parallel the transmission lines for appreciable distances should be periodically grounded. Electric fields at ground level would not exceed the limits of the National Electrical Safety Code. While many activities are compatible with transmission line rights-of-way, precautions must be taken near electrical equipment.
Corona is the electrical breakdown of the air into charged particles near high-voltage conductors. The charged particles can cause audible noise as well as radio and television interference, which is more noticeable in wet conditions. Audible noise levels dissipate as the distance increases from the transmission line.