What are the typical voltage levels used in electrical transmission systems?

The typical voltage levels used in electrical transmission systems are commonly found in the range of 69 kV, 115 kV, 230 kV, and 500 kV. These levels are essential for the efficient transmission of electricity over long distances. High-voltage transmission helps to minimize energy loss due to resistance in the wires, allowing for more effective distribution from power plants to substations and ultimately to consumers.

Using voltages in this range also supports the infrastructure of the electrical grid, ensuring that large amounts of power can be moved without significant drop-offs or losses. Additionally, operating at these voltage levels ensures safety and reliability in meeting the energy demands of various regions.

The other choices represent either underutilized voltage levels not typically associated with high-capacity transmission systems or excessively high levels that are outside the range of standard transmission practices. Low-voltage levels, such as those mentioned in some options, are more suited for distribution rather than for long-distance transmission, while values exceeding 1,000 kV are far less common and generally reserved for specialized applications or experimental technologies.