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 30º

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 30º

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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