In a balanced acb sequence, phase a to neutral voltage is Van = 100∠20V. Line-to-line voltage Vac is given by

In a balanced acb sequence, phase a to neutral voltage is Van = 100∠20V. Line -to-line voltage Vac is given by

Right Answer is:

Vac = 100√3 ∠50V

SOLUTION

The phase sequence is called a positive sequence or abc sequence when Van leads Vbn by 120° and Vbn leads Vcn by 120°. Line to line voltage Van leads phase voltage Va by 30°.

The phase sequence is called a negative sequence or acb sequence when Van leads Vcn by 120° and Vcn leads Vbn by 120°. The line to line voltage Van lags phase voltage Va by 30°.

phasor diagram of negative phase

For Negative Phase sequence ACB, the line to line voltage Vac is given as

Vac = √3Van∠−150°

Vac = √3(100V∠20°) × (1∠−150°)

Vac = 100√3∠−130°

or

Vac = 100√3∠50°

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