1) Prepare data for fault analysis of the system(see figure below). Recommended base MVA is10 MVA.3-phase Fault: SCA MVA = 1000 at 138 kV138 kV busTransformer TI 138/13.8 kV5 MVA, Z- 8%. X/R = 1313.8 kV busTransformer T2 13.8/2.4 kV2.4 MVA, Z- 5.5 %, X/R = 10MISync. Motor, 13.2 kV1000 HP @ 0.8 PFX/R = 25, X" - 0.15 puAluminum Cable 900 feetX- 0.0380 Ohms/1000 feetR- 0.0547 Ohms/1000 feet2.4 kV busFault2.3 kV, 1000 HPInduction, X/R = 25X" - 0.17 pu2.3 kV, 750 HP InductionX/R - 19X - 0.17 puM2M32) Draw equivalent diagram for this network withall per unit resistances and reactance near theirrespective elements3) Саfor the fault at bus 4. Use only first cycle data.ate symmetrical rms short circuit current

The detection and diagnosis of faults in technical systems, particularly using a strategy in which…

2) Draw equivalent diagram for this network with all per unit resistances and reactance near their respective elements 3) Calculate symmetrical rms short circuit current for the fault at bus 4. Use only first cycle data.

2) Draw equivalent diagram for this network with all per unit resistances and reactance near their respective elements 3) Calculate symmetrical rms short circuit current for the fault at bus 4. Use only first cycle data.

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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Figure 1 shows a three-bus power system network of an electric utility company with each generator is represented by an electromotive force (e.m.f.) behind the transient reactance. All impedances are expressed in per unit on a common MVA base. The pre-fault system is on noload condition with 1.0 per unit voltage, and pre-fault currents are zero. All answer must be given in FOUR (4) decimal points. (a) Construct the bus impedance matrix for the system using building algorithm method.
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 5メ G1 7000 KVA 5 KV 14% Tz 11/33KV 33/6.9 kV lond 5tj8 2 G2 load 20000K VA 15000 KVA 10% 12% 25,000 KVA 6.9KV 8/% as orebtransient [AH the mpedances are given per-unit valeues)
Due to the fault in all the phases at bus -5 the positive sequence fault current of -j1.125 flows to the ground without fault impedance to ground at bus-5. If pre-fault voltage is 1.04 p.u. and the positive sequence impedance at bus-5 is jo.25. As per fault analysis which one of the following values will be the positive sequence voltage at bus 5? Select one: O a. 0.71875 O b. 0.75875 O c. jo.75875 O d. -jo.75875
j0.2 For the following power system the impedance matrix is given below. Initially all bus voltages are 1 pu. Then a three-phase fault occurs at bus (2). j0.25 j0.2 (3) (1) j0.1 : (a) What is the fault current? (2) j0.125 j0.1 (b) What are the post-fault bus voltages? 3. 0.0625 0.02083 0.02083' Zbus 0.02083 0.07044 0.02282 0.02083 0.02282 0.06091
The LLLG fault occurs at bus-8with pre-fault voltage as 1.02 p.u. If the positive sequence impedance at bus-8 is j0.15 and positive sequence current is -j1.125. which one of the following values will be the value of zero sequence voltage at bus 8? Select one: a. 1.3125 O b. 0 O c. 0.7587 O d. 0.3125
1) For the utility radial distribution system shown on figure below (only generator is at 138kV). All impedances are in per unit on a 100MVA base and nominal voltage shown. All transformer connected taps equal nominal voltage shown. All breakers and switches are closed unless marked with N.O. (Normally Open). Calculate fault current magnitudes in rms symmetrical amps at the following locations (faults are bolted, one at a time, not simultaneous.)a. Three phase (3ph), phase to phase, and single line to ground (SLG) at 138kV bus.b. 3ph, and SLG at 34.5kV bus. 138/34.5 transformers have the same Z and are in parallel.c. 3ph, and SLG at 34.5kV at 34.5/12.47 substation high side.d. 3ph, and SLG at 12.47kV buse. 3ph, and SLG at 12.47kV tapf. 3ph, and SLG at 12.47kV end of line (EOL)g. State the 138kV source (generator) amps for the 3ph at 12.47kV EOL fault.
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 0.15 उह 3 X=j0.05 G₁ j0.6 j0.3 2 T2 j0.05 X=j0.05 G₂
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 I5メ G1 yo00 KVA 14% 5KV M Tz (G2 11/33KV 33/69 AV lond 5+j8 2 20000KVA 15070 KVA 10% 12% 25,000 KVA 6.9KV [AH the mpedances are given per-unit values) 8% as orebtraen sient ww
Power system analysis
What type of fault is Single phase to ground fault in power system.(Symmetrical or Unsymmetrical). Discuss the chance of occurrence of the above-mentioned type of fault.
n a power system what happens to phase voltages for a single line-to-ground fault as fault reactance value is increased from 0pu to 2pu?
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.