What voltage level is classified as Extra High Voltage (EHV)?

Extra High Voltage (EHV) is defined as electrical voltage levels that fall within a specific range which facilitates the efficient transmission of electricity over long distances with minimal losses and allows for the interconnection of various power systems. The voltage classification for EHV typically encompasses voltages starting at 230 kV and extending up to 765 kV. This classification is significant because it indicates the capacity to transmit large amounts of electrical energy, which plays a crucial role in the stability and efficiency of power grids.

The range of EHV typically enables the interconnection of regional power systems, making it a vital aspect of electrical engineering and power distribution. By operating at these higher voltages, utilities can reduce the current required for power transmission, thereby diminishing resistive losses which are a function of the square of the current, according to Ohm's law. Thus, EHV is important for long-distance transmission applications and facilitates the movement of power over vast networks.

In contrast, the other voltage levels mentioned in the choices do not accurately capture the widely accepted range for EHV. For instance, defining EHV simply as above 100 kV would include lower voltage categories of transmission, while stating it only from 230 kV to 350 kV does not encompass the