What is the Department's Subtransmission System voltage?

What is the Department's Subtransmission System voltage?

• A. 34.5 kV
• B. 138 kV
• C. 230 kV
• D. 4.8 kV

Answer: (A)

Subtransmission sits between the high-voltage transmission network and the local distribution feeders, using a voltage level that carries bulk power efficiently while still allowing reliable step-down to distribution voltages. In this system, 34.5 kV is the voltage used for subtransmission, which makes sense because it can carry substantial power with manageable current and protection requirements, and it steps down to the 4.8 kV distribution feeders for local service. The other options are either typical transmission voltages (138 or 230 kV) or a distribution voltage (4.8 kV), not the subtransmission level.

Subtransmission sits between the high-voltage transmission network and the local distribution feeders, using a voltage level that carries bulk power efficiently while still allowing reliable step-down to distribution voltages. In this system, 34.5 kV is the voltage used for subtransmission, which makes sense because it can carry substantial power with manageable current and protection requirements, and it steps down to the 4.8 kV distribution feeders for local service. The other options are either typical transmission voltages (138 or 230 kV) or a distribution voltage (4.8 kV), not the subtransmission level.