Line-to-ground voltages V = 28020°, V, =2502 - 110°, and bg ag V=2902130° volts are applied to a balanced 4-load consisting of cg 12+j16 ohms per branch. i. Calculate the sequence components of the line-to-ground voltages. ii. Draw the sequence networks. iii. Calculate the sequence components I I, and I of the phase 0' 1' currents.

Line-to-ground voltages V = 28020°, V, =2502 - 110°, and bg ag V=2902130° volts are applied to a balanced 4-load consisting of cg 12+j16 ohms per branch. i. Calculate the sequence components of the line-to-ground voltages. ii. Draw the sequence networks. iii. Calculate the sequence components I I, and I of the phase 0' 1' currents.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter8: Symmetrical Components

Section: Chapter Questions

Problem 8.10P

See similar textbooks

Similar questions

Three zones of a single-phase circuit are identified shown in Figure below. The zones are connected by transformers T1 and T2, whose ratings are also shown. Using base values of 33 kVA and 232 volts in zone 1, Find: 1- Draw the per-unit circuit including the per-unit impedances and the per-unit source voltage. 2- Calculate the load current both in per-unit and in amperes (actual or original value). Vs Zone 1 232.940° Vs G. 38 T₁ 30 KVA 240/480 volts Xeq = 0.10 p.u. Zone 2 Xiine = 4 Ω T₂ 20 KVA 460/115 volts Zload = Xea = 0.10 p.u. Zone 3 u 1+j2.2 Ω 2
Power in a three phase delta system with balanced load is equal to (Sqrt (3)) (VL) (IL) (p.f.) (Sqrt (3)) (Vph) (Iph) (p.f.) (Sqrt (3)) (VL) (Iph) (p.f.) O (Sqrt (3)) (Vph) (IL) (p.f.)
2. The one-line diagram of a three-phase power system is as shown in the figure below. Impedances are marked in per unit on a 100-MVA, 400-kV base. The load at bus 2 is S2 = 15.93 MW-j33.4 Mvar, and at bus 3 is S3 = 77 MW +j14 Mvar. It is required to hold the voltage at bus 3 at 4006 0 kV. Working in per unit, determine the voltage at buses 2 and 1. V3 j0.5 pu V₂ S₂ j0.4 pu S3
Select the base voltages for one section and calculate the base voltages for the rest of the sections. Remember that the voltages given are line-line. Calculate the current and impedance for all sections of the System. Assume a base complex power of 100 MVA.
In the following network, the voltage magnitudes at all buses are equal to 1 p.u., the voltage phase angles are very small, and the line resistances are negligible. All the line reactances are equal to j1 p.u. (1) (2. P₂ = 0.1 p.u. P3 = 0.2 p.u. The voltage phase angle 83 in radian at bus 3 is (Assume one of the generator bus as slack bus and sin-¹ (0.1) = 0.1 rad) (a) -0.1 (b) -0.2 (c) 0.1 (d) 0
In the above figure, a single line model of a three-phase power system is given. Base power 50MVA, base voltage 13.8kV according to its value, a) Per-unit values of power system circuit elements according to the given base power and base voltage values. calculate. b) The perunit you calculate by drawing the equivalent impedance circuit for one phase of the power system given in the figure. show on the values.
(b) The single-line diagram and the data for each device of three-phase power system are shown in Figure Q2(b). Select the common base on generator side as 100 MVA and 22 kV. The three-phase load at bus 4 absorbs 50 MVA, 0.8 power factor lagging at 10 kV. Line 1 and line 2 have reactance of 25 N and 35 Q, respectively. (i) By choosing generator rated voltage at bus 1 as the base voltage, determine the base voltage for all sections of the network. (ii) Determine the per-unit reactance for generator and transformers on a same 100 MVA base voltage. (iii) Determine the per-unit reactance for motor with rated 65 MVA and 15 kV. (iv) Determine base impedance and per-unit reactance for line 1 and line 2. Determine base impedance and per-unit reactance for the load.
(b) The single-line diagram and the data for each device of three-phase power system are shown in Figure Q2(b). Select the common base on generator side as 100 MVA and 22 kV. The three-phase load at bus 4 absorbs 50 MVA, 0.8 power factor lagging at 10 kV. Line 1 and line 2 have reactance of 25 Q and 35 Q, respectively. (i) By choosing generator rated voltage at bus 1 as the base voltage, determine the base voltage for all sections of the network. (ii) Determine the per-unit reactance for generator and transformers on a same 100 MVA base voltage. (iii) Determine the per-unit reactance for motor with rated 65 MVA and 15 kV.
3. A balanced delta connected load of "X" Q- per phase is connected at the end of a three-phase line. The line impedance is "G" - per phase. The line is supplied from a three-phase source with a line-to-line voltage of 207.85 Vrms. Taking phase "a" voltage Va 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. X-13+16j G=3+6j
b) The one-line diagram for a simple power system is given in Figure 1(b). į. Draw the impedance diagram of the system. i. Construct the bus admittance matrix, Xeus and bus impedance matrix, Zous of the system. I. Evaluate the fault current, bus voltages and line current during the flow when a balanced three-phase fault occurs on bus 1. bus 1 bus 2 j65 N G G 25 MVA 25 MVA 13.8 kV 15% 13.2/69 kV 11% 25 MVA 69/13.2 kV 11% 15 MVA 13 kV 15% Figure 1(b) m
Three zones of a single-phase circuit are identified in Figure. The zones are connected bytransformers T1 and T2, whose ratings are also shown.Using base values of 30 kVA and 240 volts in zone 1:a. draw the per-unit circuit and determine the per-unit impedances and the per-unitsource voltage.b. calculate the load current both in per-unit and in amperes. Transformer windingresistances and shunt admittance branches are neglected.
Discuss the phase shift method of generating SSB through this block diagram.