Question

Three single-phase, 50−kVA 2400:240-V transformers are connected Y−Y in a three-phase 150−kVA bank to step down the voltage at the load end of a feeder whose impedance is 0.15+j1.00ft/phase. The voltage at the sending end of the feeder is 4160 V line-to-line. On their secondary sides, the transformers supply a balanced three-phase load through a feeder whose impedance is 0.0005+j0.0020 g2/phase. Find the line-to-line voltage at the load when the load draws rated current from the transformers at a power factor of 0.80 lagging.

Answer 1

To find the line-to-line voltage at the load when the load draws rated current from the transformers at a power factor of 0.80 lagging, use the voltage drop equation.

Step-by-step explanation:

The line-to-line voltage at the load can be found using the voltage drop equation:

Vload = Vsending - (Iload * Zload)

Where Vsending is the sending end voltage (4160 V line-to-line), Iload is the load current (rated current at a power factor of 0.80 lagging), and Zload is the load impedance (0.0005+j0.0020 g2/phase). Substitute the values into the equation to find the line-to-line voltage at the load.