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Three-Phase Systems in Power Applications - Engineering

Q1:

In a Y-Y source/load configuration, the

A phase current, the line current, and the load current are all equal in each phase

B phase current, the line current, and the load current are 120° out of phase

C phase current and the line current are in phase, and both are 120° out of phase with the load current

D line current and the load current are in phase, and both are out of phase with the phase current

ANS:A - phase current, the line current, and the load current are all equal in each phase

Load current means the current appears across appliances (resistance).

Here line current is the current measure across transmission line and phase current is the current measure across the phase of star or delta connection.