In distribution stations, load is transferred to a paralleled bank by normally opening the bank __________ side CB or CBs.

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Prepare for the LADWP Electric Station Operator Test focusing on Circuit Breakers, Disconnects, and Transformers. Study with tailored questions and detailed explanations to enhance your knowledge and boost confidence. Ace your exam!

Multiple Choice

In distribution stations, load is transferred to a paralleled bank by normally opening the bank __________ side CB or CBs.

Explanation:
Load transfer between paralleled banks is accomplished by opening the low-side breakers. Opening the bank on the low-voltage side interrupts the current at the point of lowest voltage and arcing energy, making the transfer smoother and safer. It lets the high-voltage side stay energized to keep the bus live, while the bank is isolated at the low side. Switching on the high-voltage side would subject higher-energy currents to interruption, increasing arcing risk and transient effects. The other options don’t fit standard practice because there isn’t a commonly used “mid” or “back” bank-side switch for this transfer, and opening the high side would introduce more disruption and stress to the equipment.

Load transfer between paralleled banks is accomplished by opening the low-side breakers. Opening the bank on the low-voltage side interrupts the current at the point of lowest voltage and arcing energy, making the transfer smoother and safer. It lets the high-voltage side stay energized to keep the bus live, while the bank is isolated at the low side. Switching on the high-voltage side would subject higher-energy currents to interruption, increasing arcing risk and transient effects. The other options don’t fit standard practice because there isn’t a commonly used “mid” or “back” bank-side switch for this transfer, and opening the high side would introduce more disruption and stress to the equipment.

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