The following figure shows the one-line diagram of a single power network which has the line admittances shown on the figure. Each generator connected to buses 1 and 4 has a sub-transient reactance of 0.25 pu. Determine for the network
a. Ybus
b. Zbus
c. The sub-transient current in per unit in a three-phase fault on bus 3 and
d. The contributions to the fault current from line 1-3 and from 4-3
Homework Answers
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The following figure shows the one-line diagram of a single
power network which has the line...
3- The bus impedance matrix of a four-bus network with values in per unit is Z???...
3- The bus impedance matrix of a four-bus network with values in per unit is Z??? = [?0.15 ?0.08 ?0.04 ?0.07 ?0.08 ?0.15 ?0.06 ?0.09 ?0.04 ?0.06 ?0.13 ?0.05 ?0.07 ?0.09 ?0.05 ?0.12 ] Generators connected to busses 1 and 2 have their sub-transient reactances included in Zbus. Neglect pre-fault currents and find sub-transient current in pu in the fault for a three-phase fault on bus 4. Assume the voltage at fault is 1∠0 before the fault occurs. Also, find...
The one-line diagram of a three-bus power system is shown in Figure 4. All impedances are...
The one-line diagram of a three-bus power system is shown in
Figure 4. All impedances are
expressed in per unit on a common MVA base. All resistances and
shunt capacitances are
neglected. Information on each component in this system is given
below:
• Each generator is represented by an emf
behind the sub-transient reactance of j0.045
and their neutrals are connected to the
ground.
• Line 1-2 has reactance of j0.88
• Line 2-3 has reactance of j0.65
• Line...
The single-line diagram of a three-phase power system is shown. Equipment ratings are given as follows
The single-line diagram of a three-phase power system is shown. Equipment ratings are given as follows: The inductor connected to generator 3 neutral has a reactance of \(0.05\) pu using generator 3 ratings as a base.1. Draw the zero-, positive-, and negative -sequence reactance diagrams using a \(1000 \mathrm{MVA}, 765 \mathrm{kV}\) base in the zone of line \(1-2\).2. Faults at bus 2 are of interest. Determine the Thevenin equivalent of each sequence network as viewed from the fault bus. Prefault voltage...
The single-line diagram of a four-bus system and its bus impedance matrix are shown below BUS...
The single-line diagram of a four-bus system and its bus impedance matrix are shown below BUS 2 0.25 j0.2 0.125 0.25 0.4 BUS 3 BUS 1 BUS 4 j0.1 0.1 j0.2 j0.2 ground is the reference node) 0.25 0.2 0.16 0.14 0.2 0.23 0.15 0.151 ZBUs =기0.16 0.15 0.196 0.1 0.14 0.151 0. 0.195 A solid three-phase fault occurs at bus 2 of the network. (a) Calculate the initial symmetrical RMS current in the fault. (b) Determine the voltages during...
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2. The Fig. P2.1 shows the one-line diagram of a simple four-bus system. Table P2.1 gives...
2. The Fig. P2.1 shows the one-line diagram of a simple four-bus
system. Table P2.1
gives the line impedances identified by the buses on which these
terminate. The
shunt admittance at all the buses is assumed negligible
(a) Convert the network impedances to admittances.
(b) Obtain the bus admittance YBUS assuming that the line shown
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connected.
(c) (i) What modifications need to be carried out in YBUS if the
dotted line is
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(ii) Obtain the...
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PLEASE SOLVE THIS POWER / LOAD FLOW 07-Elec-B December 2016 Page 7 of 7 Problem 7...
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The Fig. P1.1 is a one-line diagram of a simple power system. There prefault system is...
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The one-line diagram of a three-bus power system is shown in
Figure 4. All impedances are
expressed in per unit on a common MVA base. All resistances and
shunt capacitances are
neglected. Information on each component in this system is given
below:
• Each generator is represented by an emf
behind the sub-transient reactance of j0.045
and their neutrals are connected to the
ground.
• Line 1-2 has reactance of j0.88
• Line 2-3 has reactance of j0.65
• Line...
The single-line diagram of a three-phase power system is shown. Equipment ratings are given as follows: The inductor connected to generator 3 neutral has a reactance of \(0.05\) pu using generator 3 ratings as a base.1. Draw the zero-, positive-, and negative -sequence reactance diagrams using a \(1000 \mathrm{MVA}, 765 \mathrm{kV}\) base in the zone of line \(1-2\).2. Faults at bus 2 are of interest. Determine the Thevenin equivalent of each sequence network as viewed from the fault bus. Prefault voltage...
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The one-line diagram of a simple power system is shown in Figure 1. The neutral of each generator is grounded through a current-limiting reactor of 0.25/3 per unit on a 100-MVA base. The system data expressed in per unit on a common 100-MVA base is tabulated below. The generators are running on no-load at their rated voltage and rated frequency with their emfs in phase. Determine the fault current for the following faults giving Zo = 0.35, Z = 0.22...
2. The Fig. P2.1 shows the one-line diagram of a simple four-bus
system. Table P2.1
gives the line impedances identified by the buses on which these
terminate. The
shunt admittance at all the buses is assumed negligible
(a) Convert the network impedances to admittances.
(b) Obtain the bus admittance YBUS assuming that the line shown
dotted is not
connected.
(c) (i) What modifications need to be carried out in YBUS if the
dotted line is
now connected.
(ii) Obtain the...
A single line diagram of a power system is shown in Fig. 2. The system data with equipment ratings and assumed sequence reactances are given the following table. The neutrals of the generator and A-Y transformers are solidly grounded. The motor neutral is grounded through a reactance Xn 0.05 per unit on the motor base. Assume that Pre-fault voltage is takin as VF-1.0 ,0° per unit and Pre- fault load current and Δ-Y transformer phase shift are neglected In the...
PLEASE SOLVE THIS POWER / LOAD FLOW
07-Elec-B December 2016 Page 7 of 7 Problem 7 Consider the system shown in the single-line diagram of Figure (5). Here, a 60-Hz synchronous generator having a transient reactance of 0.15 pu. is connected to an infinite bus through a transformer whose reactance is 0.1 p. u. and a double circuit transmission line with circuits having a reactance of 0.6 p.u each as indicated in the figurc. The generator delivers a real power...
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