Delta systems require more of which electrical quantity?

Delta systems require more of which electrical quantity?

• A. Voltage
• B. Current
• C. Power
• D. Frequency

Answer: (B)

In a delta configuration, the current the source has to supply in the lines ends up higher than the current flowing through each individual winding. For a balanced delta, the line current is sqrt(3) times the winding (phase) current. That means, to deliver the same power with the same line-to-line voltage, the supply must carry more current in a delta system. The voltage per winding is set by the line voltage and doesn’t inherently increase, and frequency is determined by the power system frequency, not the configuration. So the quantity that increases in delta setups is current.

In a delta configuration, the current the source has to supply in the lines ends up higher than the current flowing through each individual winding. For a balanced delta, the line current is sqrt(3) times the winding (phase) current. That means, to deliver the same power with the same line-to-line voltage, the supply must carry more current in a delta system. The voltage per winding is set by the line voltage and doesn’t inherently increase, and frequency is determined by the power system frequency, not the configuration. So the quantity that increases in delta setups is current.