A balanced Δ -connected impedance load with ( 12 + j 9 ) Ω per phase is supplied by a balanced three-phase 60-Hz, 208-V source, (a) Calculate the line current, the total real and reactive power absorbed by the load, the load power factor, and the apparent load power, (b) Sketch a phasor diagram showing the line currents, the line-to-line source voltages, and the Δ -load currents. Use V a b as the reference.
A balanced Δ -connected impedance load with ( 12 + j 9 ) Ω per phase is supplied by a balanced three-phase 60-Hz, 208-V source, (a) Calculate the line current, the total real and reactive power absorbed by the load, the load power factor, and the apparent load power, (b) Sketch a phasor diagram showing the line currents, the line-to-line source voltages, and the Δ -load currents. Use V a b as the reference.
A balanced
Δ
-connected impedance load with
(
12
+
j
9
)
Ω
per phase is supplied by a balanced three-phase
60-Hz,
208-V
source, (a) Calculate the line current, the total real and reactive power absorbed by the load, the load power factor, and the apparent load power, (b) Sketch a phasor diagram showing the line currents, the line-to-line source voltages, and the
Δ
-load currents. Use
V
a
b
as the reference.
Suppose that a current source with Is amperes of current is connected in parallel to a pair of impedances Z₁ and Z2. Let I₁ be the current through Z₁ and 12
be the current through Z₂. Then, the total voltage Is is divided between 1₁ and 12 in proportion to impedance values Z₁ and Z2.
a. True
O b. False
A three-phase system has balanced conditions so that the per-phase circuit representation can be used as shown in Figure 1
Select the turns ratio of the step-up and step-down transformers that the system operates with an efficiency greater than 99 percent. Moreover, find the complex power (received or given) of all components in the circuit and the V1 and V2 voltages. The load voltage is specified as 4 kV rms, and the load impedance is 4/3 ohm.
..
Three Impedances each of (9 - j18)N are
connected in mesh across a three-phase 415V ac
supply. Determine the phase current, line current,
active power, reactive power drawn from supply.
Also draw the Phasor diagram for the mesh
connection and marks the Line current ,phase
current line voltage and phase angle between
phase current and pahse voltage.
phase current (Ip)
Line current
real power
reactive power
Chapter 2 Solutions
Power System Analysis and Design (MindTap Course List)
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