A balanced positive-sequence three-phase source has Van (t) = 100 cos (377t + 90

Question

A balanced positive-sequence three-phase source has Van (t) = 100 cos (377t + 90°) V. Part C Give expressions for ven (t). Express the phase angle in degrees. Express your answer in terms of t. LG Axon vec 5 + O 2 ? van (t) = 100 cos (377t – 30) Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part D Give expressions for Von (t) for a negative-sequence source. Express the phase angle in degrees. Express your answer in terms of t. 16 Aprvec 6 + 0 2 ? Vim (t) = 100 cos (377t+210) Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining

Explanation / Answer

In the balanced positive sequence three phase source

Vbn(t) lags Van(t) by 1200

Van(t) = 100*cos(377t+900) V hence Vbn(t) = 100*cos(377t+900-1200) = 100cos(377t-300) V

Vcn(t) lags Vbn(t) by 1200 hence Vcn(t) = 100cos(377t-300-1200) = 100cos(377t-1500) V

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