Q1) Consider a system with sequence impedances given by Z+ = 70.2577, Z- = 40.2085, and...
Busl Bus2 Bus3 Figure 1: One line diagram All impedances are specified in per unit. For generators, assume Z'- Zj0.2,Z- j0.05 For transformers, assume Z -Z -Zo - j0.05 For lines assume Z+= Z'=j0.1,20-jo.3 Assume unloaded pre-fault condition with voltages 1.0 pu at all the three buses. A fault occurs at bus 1. Ignore phase shift and perform the following computations: A. Draw the sequence network diagrams (positive, negative and zero) and find the Thevenin equivalent for each sequence network...
UUUUUUUse scriere. 10) 33 Consider figure 3.1 below and answer the questions that follow Z=2j Z=3x2, 20MVA 132/11kV Z =5% 2=2x2, 2=2=Z=4 Figure 3.1 3.3.1 Express all impedances in per unit (use a base of 100MVA) (10) 3.3.2 Calculate the single phase to ground fault current for a fault at busbar C (10) (show the equivalent sequence networks). Use an MVA base of 100MVA.
(10 points) For the power system shown below, sketch the sequence circuit connections for a 02, phase A to ground fault at bus B, and develop the equation for calculating the fault current in sequence coordinates. The sequence impedances of the generator and transformer are shown in the figure. T1 B (GENHH OH SLG FAULT Generator: Zs1 = Zs2, Zso, Y-grounded T1: Zy1 = Z12 = Zto, Delta-Wye Grounded Fault: Phase A to Ground, Z = 0
For the radial distribution system shown in the figure below, the impedances of the two line sections and the equivalent generator are given in pu. Consider symmetrical faults only (three-phase, positive sequence) and assume that the relay at bus A is set to pickup for a fault at bus C. The relay at bus B is set to pickup at one half of that value. 2) Assume there is a DER installed at bus C whose fault current contribution is...
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...
The zero-, positive-, and negative-sequence bus impedance matrices for a three bus power system are given below 5. T0.10 0.15 0.121 Bu0.15 0.10 0.08 pu [0.16 0.10 0.15] Lo.15 0.14 0.30 0.12 0.08 0.35 ZBus ZBus0.10 0.20 0.14 pu Determine the per unit fault current and the bus voltages during fault for (a) A bolted three-phase fault at bus 2. (b) A bolted single line-to-ground fault at bus 2. (c) A bolted line-to-line fault at bus 2 (d) A bolted...
I need help in matlab codes please Single line to ground fault analysis Example 9.4 Problem 1 A three-phase, il kV, 30 MVA alternator with grounded neutral has a direct axis subtransien pu respectively based on system base. A single line to ground fault has occurred in phase a. Determine the fault current, line to ground voltages in pu. t, negative sequence and zero sequence reactances of 0.2 pu, 0.3 pu and 0.1 Solution: Phase voltage E.0 pu From equation...
Use power base of 100MVA to change to per unit Consider the transmission system in figure 1 below Gen 1 Тx 2 Line 1 Gen 2 Tx3 Line 4 Line 3 R F Tx 1 Gen 3 Line 2 Figure 1 Impedance and winding details are:- Generators: Gen 1 132kV, Z=0+j12.5% on 25MVA Gen 2 132kV, Z= 0+j12.5% on 25 MVA 20KV, Z 0+j10% on 25 MVA A- connected windings Gen 3 Transformers Earthed Y windings (both sides) Earthed Y...
Bus A Bus B R1 TI ine 1 20% 80% line 2 T2 R2 110 kV 11 kV The fault is located at point F, which is 20% of the total line 2 length from Bus B Fault MVA 1524.20471 Three-phase fault level in MVA at bus A SPFL (kA) 8 MVA1 MVA2 X1 (96 X2 (96) R1 (2) R2 (Q) z' (Q) Zo (2) Rf (Q) Single phase to ground fault level (kA) at bus A Transformer 1 MVA...
1) 2) 3) The figure shows three particles with charges Q1 and Q2 with the electric field lines shown. What is the ratio of Q1/Q2? O 1:4 O 1:1 08:4 2:4 04:1 Given the field map to the right, the dashed box contains all the charge generating the field. Is the long range field that of a monopole or a dipole? Monopole O Dipole Both a monopole and a dipole Select the inequality for the potential at the points A,...