EBK POWER SYSTEM ANALYSIS AND DESIGN
6th Edition
ISBN: 9781305886957
Author: Glover
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Two loads connected in parallel are respectively 2 kW at a pf of 0.75 leading and 4 kW at a
pf of 0.95 lagging. Calculate the pf of the combined two loads. Find the complex power
supplied by the source.
Hints:
•
•
Since the two loads are parallel, the complex power, S, supplied by the source is
S = S₁+ S₂
Calculate the complex powers, S₁ and S2, of each load (use power triangles) and add
them to find the total S.
Calculate 0 and obtain pf.
A 3-phase, 20-pole induction motor is con-
nected to a 600 V, 60 Hz source.
a. What is the synchronous speed?
b. If the voltage is reduced to 300 V, will
the synchronous speed change?
c. How many groups are there, per
phase?
Starting from Maxwell’s equations derive the Kirchohf’s circuit laws for voltage and current.
Clearly mention what approximation is used for this derivation.
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- In the control system shown in Figure Q4(a), G₁(s) = and G₂(s) == If the system has the specifications for the natural frequency and dampingratio of -5 rad/sec and {=0.7, respectively, determine K and H,(s) when H₂(s) = 1.arrow_forwardCan the expert help me draw a curve on my graph paper? TERMINAL VOLTS 9000 8000 7000 6000 5000 4100 4000 14 18 22 26 30 34 38 FIELD AMPERES, If OPEN CIRCUIT CHARACTERSTICS Fig 3 42 42 46 50 54arrow_forwardSolve this problem and show all of the workarrow_forward
- 4. A 120/240 volt 10kVA two-winding transformer is to be reconnected as a step-up 120/360 volt auto-transformer. What is the kVA rating of the new auto- transformer connection? (10 pts)arrow_forwardSolve this problem and show all of the workarrow_forward3. The total power consumed by a balanced three-phase 480 volts rms line-to-line system is 13.3 kW and 9.97 kVARS. Determine the current (both magnitude and phase) supplied to the load. (10 pts)arrow_forward
- 2. Determine the rms current (magnitude and phase) supplied by the 120 volt rms source in the circuit shown below. Assume the transformer is ideal. (20 pts) 120 Loo Volts rms. j452 1:3 272arrow_forward6. Find the transfer function H(jw) = Vo(jw)/Vs(jw). Determine the type of filter (i.e. lowpass, highpass) (20 pts) Vs Rz R₁ L +1 Noarrow_forward1. A balanced three-phase voltage source with a line-to-line magnitude of 208 volts rms supplies a balanced delta-connected load of 12 + j9 ohms per-phase. Determine the rms magnitude of the current that will flow in the lines connecting the voltage source to the load. (20 pts)arrow_forward
- 5. For the circuit shown below determine the following quantities: a. An expression for the transfer relationship H(jw) = Vo(jw) / Vs(jw). b. The maximum value of the transfer relationship. c. Identify the type of filter (i.e. low pass, high pass) d. Determine the cutoff frequency if R₁ = 10k ohms, R2 = 12k ohms and L= 10H. (20 pts) + Vs ① R₁ + L Vo R2arrow_forwardpower systemsarrow_forwardpower systemsarrow_forward
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