Q2/The positive-sequence reactances for the power system shown in Figure are in per unit on a common MVA base. Resistances are neglected and the negative-sequence impedances are assumed to be the same as the positive-sequence impedances. A bolted line-to-line fault occurs between phases b and c at bus 2. Before the fault occurrence, all bus voltages are 1.0 per unit. Obtain the positive sequence bus impedance matrix. Find the fault current, the three-phase bus voltages during fault, and the line currents in each phase. T₁ 1 X=j0.05 0.15 3 GTOCO 14 G₁ j0.6 j0.3 2 T2 j0.05 X=j0.05 B8 (G₂) HXD

Q2/The positive-sequence reactances for the power system shown in Figure are in per unit on a common MVA base. Resistances are neglected and the negative-sequence impedances are assumed to be the same as the positive-sequence impedances. A bolted line-to-line fault occurs between phases b and c at bus 2. Before the fault occurrence, all bus voltages are 1.0 per unit. Obtain the positive sequence bus impedance matrix. Find the fault current, the three-phase bus voltages during fault, and the line currents in each phase. T₁ 1 X=j0.05 0.15 3 GTOCO 14 G₁ j0.6 j0.3 2 T2 j0.05 X=j0.05 B8 (G₂) HXD

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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what is bus impedance matrix ? how it is useful in symmetrical fault analysis?
Figure below shows the single-line diagram of three-bus power system with generation at bus 1 and bus 3. The voltage at bus 1 is V₁ = 1.025/0° per unit. The voltage magnitude at bus 3 is fixed at 1.05 per unit with a real power generation of 250 MW. The scheduled load on bus 2 is marked on the diagram. Line impedances are marked in per unit on a 100 MVA base. Line resistances and line charging susceptances are neglected. By using Gauss-Seidel method and initial estimates of V₂(0) = 1.020° and V3(0) = 1.0520°, determine V₂ and V3. Perform calculation for one iteration. V₁ = 1.025/0° j0.1 Slack Bus j0.2 j0.4 j0.2 3 j0.1 250 MW 150 Mvar |V3|=1.05 P3 = 250 MW
Given the network shown, for a solid three-phase fault on bus 2 (a) find the sub transient current in per unit from generator 1 and in line 1-2; (b) find the voltages at bus 1 and bus 3. Assume that no current is flowing prior to the fault and that the pre fault voltage at bus 2 is 1.0 per unit. Show your solution.
At a 220 kV substation of apowersystem, it is given that the three-phase fault level is 4000 MVA and single-line toground fault level is 5000 MVA. Neglecting the resistance and the shunt susceptances ofthe system The positive sequence driving pointeactance at the bus is:
The positive sequence reactance for the power system shown in Figure below are in per unit on a common MVA base. Resistances are neglected and the negative sequence impedances are assumed to be the same as the positive sequence impedances. A bolted line to line fault occurs between phase 'b' and phase 'c' at bus 2. Before the fault occurrence, all bus voltages are 1.0 per unit. (i) Obtain the positive sequence bus impedance matrix. (ii) Find the fault current, the three phase bus voltages during fault at all the buses. (iii) Find the three phase currents through the transformer T1 during the fault. 2 3 XL1 X= j0.05 (G1 X= j0.05 G2 XT1 XT2 XL2 4 XT1 XL1 X12 XT2 jo.15 jo.25 jo.5 jo.15
The fault currents for a three-phase fault are,(a) Negative sequence components(b) Positive sequence components(c) Both positive and negative sequence components(d) Zero sequence componentsAnswer with proper explaination and reasoning
For the following single line diagram of a three-phase system, a three-phase fault occurs at point P and just before the fault the line voltage is 18 kV at P. Find out the transient fault current in pu and original value at point P. Take, the given kVA and kV of the G1 as the new base. [hint: the transient and sub-transient reactances of the synchronous generators are assumed to be same. But for the motors, assume that the transient one is 1.7 times of the sub-transient reactance.] 20,000 KV A 6.9KV 15% G1 7000 KVA 5KV Tz 14% 11/33KV 33/6.9 AV 5+j8 s2 (G2 load 20000 KVA 15000 KVA 10% 12%0 25,000 KVA 6.9KV 8% as orebtsansient [Au tue mpedanmees are given per-unit values)
During fault between two phases, the voltage drops across zero sequence impedance is Select one: O a. Independent of positive and negative sequence voltages O b. Equal to Negative sequence voltage O c. Equal to Positive sequence voltage O d. Equal to Positive sequence voltage, and negative sequence voltage
At a 220 kV substation of apowersystem, it is given that the three-phase fault level is 4000 MVA and single-line toground fault level is 5000 MVA. Neglecting the resistance and the shunt susceptances ofthe system The positive sequence driving pointeactance at the bus is:
True Or Fulse ???
Derive an expression for fault current for single line-to-ground fault by symmetrical components method.Derive an expression for fault current for line-to-line fault by symmetrical components method.Derive an expression for fault current for doube line-to-ground fault by symmetrical components method.
Given Zo = 0.199290° pu, Z, = 0.175/90° pu, Z₂ = 0.175290° pu, compute the fault current and voltages for a Single line-to-ground fault. Note that the sequence impedances are in per-unit. This means that the results for current and voltage will be in per-unit.