1.The system consumes 150KW, 208V line to line at 0.8 lagging power factor from parallel generator that supply a pure resistive balance load 0.01 ohm. A) determine the total armature resistance of parallel generator B) determine the total synchronous reactance of parallel generator
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- With the same transformer banks as in Problem 3.47, Figure 3.41 shows the oneline diagram of a generator, a step-up transformer bank, a transmission line, a stepown transformer bank, and an impedan load. The generator terminal voltage is 15 kV (line-to-line). (a) Draw the per-phase equivalent circuit, aounting for phase shifts for positive-sequence operation. (b) By choosing the line-to-neutral generator terminal voltage as the reference, determine the magnitudes of the generator current, transmiss ion-line current, load current, and line-to-line load voltage. Also, find the three-phase complex power delivered to the load.PowerWorid Simulator case Problem 3_60 duplicates Example 3.13 except that a resistance term of 0.06 per unit has been added to the transformer and 0.05 per unit to the transmission line. Since the system is no longer lossless, a field showing the real power losses has also been added to the oneline. With the LTC tap fixed at 1.05, plot the real power losses as the phase shift angle is varied from 10 to +10 degrees. What value of phase shift minimizes the system losses?Equipment ratings for the five-bus power system shown in Figure 7.15 are as follows: Generator G1:    50 MVA, 12kV, X=0.2 per unit Generator G2: 100 MVA, 15 kV, X=0.2 per unit Transformer T1: 50 MVA, 10 kV Y/138kVY,X=0.10 per unit Transformer T2: 100 MVA, 15 kV /138kVY,X=0.10 per unit Each 138-kV line: X1=40 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a) Draw the positive-sequence reactance diagram in unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine (b) the Thévenin equivalent at the fault, (c) the subtransient fault current in per unit and in kA rms, and (d) contributions to the fault from generator G2 and from transformer T2.
- Determine the bus admittance matrix (Ybus) for the three-phase power system shown in Figure 6.23 with input data given in Table 6.11 and partial results in Table 6.12. Assume a three-phase 100 MVA per unit base. TABLE 6.11 Bus input data for Problem 6.20 TABLE 6.12 Partially Completed Bus Admittance Matrix (Ybus) for Problem 6.30A (500 MW) generator is delivering (180 MW) to infinite bus through the unit transformer and double transmission lines. The per-unit ractances for a given system are shown in figure below andall the reactances are based on (100 MW) base. The generator emf is ( 1.35p .u.). Determine whether the system remains stable after one circuit of the lines is switch off?Give the names of shaft misalignments occuring in power transmission systems, draw the sketches for each of them and explain their features. For each kind of misalignment propose at least one type of appropriate coupling, which can assure the proper way of operation.give solution as soon as possible.
- Using NEC: What is the size of a generator feeder, with a 100A OCPD, single phase, 20KW, 120/240V, with terminals at 75°C?I. Further simplify this diagram to a Thevenin model with (Vf) as the generator. 2. Determine the per unit current flowing and the actual current that flows through the fault switch when closed (assume Ibase is 251 A). 3. Describe the operational features of power relay and circuit breaker designed to protect a radial power feeder, include in your description forms of protection provided by the relay and methods of obtaining line dataThree-phase, 60-Hz synchronous generator is connected through a transformer and paralleltransmission lines to an infinite bus. All reactances are given in per-unit on a common systembase. If the infinite bus receives 1.0 per unit real power at 0.95 p.f. lagging, determinea) the internal voltage of the generator andb) the equation for the electrical power delivered by the generator versus its power angle δ.
- A 24,000 kVA, 17.32 kV, three-phase, 60 Hz synchronous reactance of 5 Ω/phase and negligible armature resistance. At a certain excitation, the generator delivers rated load, 0.8 pf lagging to an infinite bus bar at a line the line voltage of 17.32 kV. Determine the excitation voltage per phaseThe impedance seen from the relay side in a distance relay is 10 ohms. Given that the CT ratio is 1000 : 1 and the PT ratio is 100,000 : 110, determine the actual impedance. Given that the line has a resistance of 1 milliohm per km and a reactance of 20 milliohm per km, find the distance to fault. Assume single-phaseline.