
a)
Find the phase sequence for the given set of voltages.
a)

Answer to Problem 1P
The phase sequence is acb sequence.
Explanation of Solution
Given data:
Consider the set of voltages.
Calculation:
Convert the voltage in Equation (1) from cosine voltage form to phasor form.
Convert the voltage in Equation (2) from cosine voltage form to phasor form.
Convert the voltage in Equation (3) from cosine voltage form to phasor form.
Subtract the phase angle of a-phase from all the phase angles of
And
From Equations (4), (5), and (6), the voltage at phase-b leads a-phase voltage by
Conclusion:
Thus, the phase sequence is acb sequence.
b)
Find the phase sequence for the given set of voltages.
b)

Answer to Problem 1P
The phase sequence is abc sequence.
Explanation of Solution
Given data:
Consider the set of voltages.
Calculation:
Convert the voltage in Equation (7) from cosine voltage form to phasor form.
Convert the voltage in Equation (8) from cosine voltage form to phasor form.
Convert the voltage in Equation (9) from cosine voltage form to phasor form.
Subtract the phase angle of a-phase from all the phase angles of
And
From Equations (10), (11), and (12), the voltage at phase-b lags a-phase voltage by
Conclusion:
Thus, the phase sequence is abc sequence.
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Chapter 11 Solutions
EBK ELECTRIC CIRCUITS
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