In station designs, circuits are placed in what configuration with disconnects?

In station designs, circuits are placed in what configuration with disconnects?

• A. Series
• B. Parallel
• C. Delta
• D. Wye

Answer: (A)

The main idea is that each circuit in a station is taken from the common source through a disconnect that sits in the path of that circuit. Placing the disconnect in series with the circuit allows one branch to be opened and isolated for maintenance or fault clearance without cutting power to the other circuits. The delta and wye options refer to three-phase connection schemes, not how a feeder is isolated with a disconnect, so they don’t describe the arrangement in question. While multiple circuits may be connected to the same bus and effectively operate in parallel, the device used to isolate each circuit is placed in the series leg of that circuit, making the practical isolation path a series configuration for that branch.

The main idea is that each circuit in a station is taken from the common source through a disconnect that sits in the path of that circuit. Placing the disconnect in series with the circuit allows one branch to be opened and isolated for maintenance or fault clearance without cutting power to the other circuits. The delta and wye options refer to three-phase connection schemes, not how a feeder is isolated with a disconnect, so they don’t describe the arrangement in question. While multiple circuits may be connected to the same bus and effectively operate in parallel, the device used to isolate each circuit is placed in the series leg of that circuit, making the practical isolation path a series configuration for that branch.