What voltage range do subtransmission lines typically operate at?

Subtransmission lines are typically utilized to connect transmission systems to distribution systems and operate at voltages that range between 69 kV and 161 kV. This voltage range is ideal for efficient power transfer over relatively short distances while minimizing losses due to resistance and maintaining the necessary voltage levels for effective distribution to end users.

The choice of this voltage range allows for balancing between high transmission capacities and practical distribution capabilities, making it an optimal range for subtransmission lines. Higher voltages would be utilized purely for long-distance transmission lines, while lower voltages are more suited for local distribution. Understanding this classification helps in identifying the role and function of these subtransmission lines within the larger electrical grid infrastructure.