# Essay, Term Paper

666 Words Mar 21st, 2013 3 Pages
TUTORIAL 1
Fundamentals

1. An inductive load consisting of R and X in series feeding from a 2400-Vrms supply absorbs 288 kW at a lagging power factor of 0.8. Determine R and X.

2. An inductive load consisting of R and X in parallel feeding from a 2400-Vrms supply absorbs 288 kW at a lagging power factor of 0.8. Determine R and X.

3. Two loads connected in parallel are supplied from a single-phase 240-Vrms source. The two loads draw a total real power of 400 kW at a power factor of 0.8 lagging. One of the loads draws 120 kW at a power factor of 0.96 leading. Find the complex power of the other load.

4. The load shown in figure 1 consists of resistance R in parallel with a capacitor of reactance X. The load is fed from a
The line impedance is 1 + j2  per phase. The line is supplied from a three-phase source with a line-to-line voltage of 207.85 Vrms. Taking Van as reference, determine the following:

a. Current in phase a

b. Total complex power supplied from the source

c. Magnitude of the line-to-line voltage at the load terminal

Figure T3

9. Three loads are connected in parallel across a 12.47 kV three-phase supply.

a. Find the total complex power, power factor, and the supply current per phase

b. A Y-connected capacitor bank is connected in parallel with the loads. Find the total kvar and the capacitance per phase in F to improve the overall power factor to 0.8 lagging. What is the new line current?

10. In PowerWorld Simulator problem 2.32 (see figure below), a 10MW, 5MVar load is supplied at 20kV through a feeder with an impedance of 1.5+j3 Ohm. The load is compensated with a capacitor whose output, Qcap can be varied in 0.5MVar steps between 0 & 10MVar. (in this part, you need to open Problem2_32.pwb in the software in run mode & run the simulation in the tool ribbon).

a. What value of Qcap minimizes the real power line losses?.

b. What value of Qcap minimizes the MVA power flow into the

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