Question

4.30. The phasor diagram for a 60-Hz, three-phase synchronous generator is shown in Fig. P4.30. Note that all sides and two angles of the triangle are shown. The current is 21 A, and the generator has four poles. The diagram shows per-phase values. (a) Is the generator overexcited or underexcited? (b) What is the rotor power angle? (c) What is the power factor and is it leading or lagging? (d) Determine the synchronous reactance. (e) Determine the input power and torque, ignoring losses. $\bar{E}_f = 150\angle50^\circ$ $50^\circ$ Length = 122.4 V $\bar{V} = \frac{240}{\sqrt{3}}\angle20^\circ$ $110.1^\circ$ Figure P4.30

          4.30. The phasor diagram for a 60-Hz, three-phase synchronous generator is shown in Fig. P4.30. Note that all sides and two angles of the triangle are shown. The current is 21 A, and the generator has four poles. The diagram shows per-phase values.
(a) Is the generator overexcited or underexcited?
(b) What is the rotor power angle?
(c) What is the power factor and is it leading or lagging?
(d) Determine the synchronous reactance.
(e) Determine the input power and torque, ignoring losses.
$\bar{E}_f = 150\angle50^\circ$
$50^\circ$
Length = 122.4 V
$\bar{V} = \frac{240}{\sqrt{3}}\angle20^\circ$
$110.1^\circ$
Figure P4.30

4.30. The phasor diagram for a 60-Hz, three-phase synchronous generator is shown in Fig. P4.30. Note that all sides and two angles of the triangle are shown. The current is 21 A, and the generator has four poles. The diagram shows per-phase values.
(a) Is the generator overexcited or underexcited?
(b) What is the rotor power angle?
(c) What is the power factor and is it leading or lagging?
(d) Determine the synchronous reactance.
(e) Determine the input power and torque, ignoring losses.
E̅f = 150∠50^∘
50^∘
Length = 122.4 V
V̅ = (240)/(√(3))∠20^∘
110.1^∘
Figure P4.30

Added by Karen N.

Question

Please give Ace some feedback