State TRUE/FALSE for following statements.

1. In a delta-delta system, the line voltage and phase voltage are equal.

2. When a Y-connected load is supplied by voltages in abc phase sequence, the line voltages lag the corresponding phase voltages by 30°.

Concept:

• The delta in a three-phase system is formed by connecting one end of the winding to the starting end of other winding and the connections are continued to form a closed loop.
• Line voltage in delta connection is equal to phase voltage. Therefore first statement is true.

​In a delta-connected three-phase system:

\(V_{line} = V_{phase}\)

\(I_{line} =\sqrt 3 I_{phase}\)

Total Power \(= √3 × V_L × I_L×cosϕ\)

• The figure given below shows the phasor diagram of Line and Phase voltages in ABC phase sequence:

• For abc phase sequence, Line voltages of each phase will always lead the phase voltages by 30^o. Therefore the second statement is false.