- #1

Ronaldo95163

- 77

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**For this question I'm focusing on part B**

1. Homework Statement

1. Homework Statement

Three similar coils, connected in star, take a total power of 1.5 kW, at a power factor of 0.2, from a three-phase, 415 V, 60 Hz supply. Calculate:

a) the resistance and inductance of each coil;

b) the line currents if one of the coils is short circuited.

## Homework Equations

## The Attempt at a Solution

If I have say three coils that are in a star arrangement and are supplied to by a 3 phase power supply like below (the power supply could be star/delta arranged but I'm just using this pic for illustration to aid the question)

If I were to short circuit one of the coils say...Zc (which is equivalent to R+jXl for this example...as would Za and Zb as they're all similar coils)...what would happen to the system?

I'm assuming that the line currents remain unchanged as they're supplied by the source. But what about the line voltages?

Would the line voltage Vca be equal to Vak in this case...and Vab remain unchanged?

Thanks in advance :D