Q2/ A telephone company operates three identical stations at differentlocations. During one-year period, the number of malfunctions reported byeach station and the causes are shown below.StationC11ABProblems with electricity supplied4Computer malfunction34Malfunctioning electrical equipmentCaused by other human errors77(a)Suppose that a malfunction was reported and it was found to be caused byother human errors. What is the probability that it came from station C (1.5mark)(b) If a malfunction was reported because of computer malfunction, whichstation is most likely reported the malfunction? (1.5 mark)

Q2/ A telephone company operates three identical stations at different locations. During one-year period, the number of malfunctions reported by each station and the causes are shown below. в с 1 1 Station A Problems with electricity supplied Computer malfunction 4 Malfunctioning electrical equipment 5 Caused by other human errors 7 (a)Suppose that a malfunction was reported and it was found to be caused by other human errors. What is the probability that it came from station C (1.5 mark) (b) If a malfunction was reported because of computer malfunction, which station is most likely reported the malfunction? (1.5 mark) 225 347

Q2/ A telephone company operates three identical stations at different locations. During one-year period, the number of malfunctions reported by each station and the causes are shown below. в с 1 1 Station A Problems with electricity supplied Computer malfunction 4 Malfunctioning electrical equipment 5 Caused by other human errors 7 (a)Suppose that a malfunction was reported and it was found to be caused by other human errors. What is the probability that it came from station C (1.5 mark) (b) If a malfunction was reported because of computer malfunction, which station is most likely reported the malfunction? (1.5 mark) 225 347

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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Xt = 0.2 10 E оздо X'd = 0.3 XL1 = 0.3 XL2 = 0.3 V = 1.0 A 50Hz synchronous generator having inertia constant H=5MJ/MVA and a direct axis transient reactance X = 0.3 per unit is connected to an infinite bus through a purely reactive circuit as shown above. Reactances in per unit on a common system base are marked on the diagram. The generator is delivering real power P = 0.8 per unit and Q = 0.074 per unit to the infinite bus at a voltage V = 1.0 per unit when a 3- phase fault occurs at the receiving end. Determine the critical clearing angle.
1. A 120-MVA, 20-kV generator is connected to a transformer. The generator has reactance of 19%, 28%, and 130% and time constants of Td" = 0.035 sec. Tď = 2.0 sec and TA= 0.2 sec. It is operating at no load and rated voltage when a three-phase short circuit occurs at the generator terminals. Calculate: A. The initial symmetrical rms fault current in kA. B. The Sustained rms fault current in kA.
GIVEN: Three-phase System Data: 30 Source ZLine 30 Load Ean Zan = Zbn = Zen = 0.1 + j1.5 n Source: 12020° v; Epn = 1202 – 120° v; Een = 1204120° v (grounded neutral) Line Impedance: Zline a = Zline b Zline c = 1+ j2 N; C Load Impedance: Zab 40 + j30 N; Zbc = 40 – j30 N; Zca = 50 + j0 N %3D %3D
System AB is connected to system BC via a 1000 MW tie-line. The total capacity of the online units and the demand of system AB are 10000 MW and 8500 MW, respectively. The total capacity of the online units and the demand of system BC are 20000 MW and 17000 MW, respectively. System AB is importing 500 MW from system BC and all units operate with a common governor droop setting of 5% for both systems. All generating units are operating with sufficient spinning reserve and can respond to frequency changes. AB System capacity=10000 MW 8500 MW 9000 MW AB system load (a) (b) (c) (d) (e) T... 60.15 Hz 60.075 Hz 60.0 Hz 59.925 Hz 59.85 Hz BC system capacity = 20000 MW 500 MW 17500 MW Q34. Determine the new frequency of system AB if the tie-lie interconnecting systems AB and BC trips (a) (b) (c) (d) Q35. Determine the new frequency of system BC if the tie-lie trips 60.15 Hz 60.075 Hz 60.0 Hz 59.925 Hz 59.85 Hz 17000 MW BC system load
Problem 1(A)- In reference to the power system shown below, the system is operating at nominal voltage without pre-fault currents (load currents ignored) when a bolted ( = 0p .u .) single line- to ground fault occurs on phase A at bus 3. Both machines are grounded through reactance. X, = X, =15% X, = 50% 1 2 3 4 my O 어。 100MVA,20KV 100MVA 100MVA 100MVA,20KV X, = X = 20% 20Υ/345Y - kV 20Y /345Y – kV X, = X = 20% X2 = 20% X, = X, = X, = 8% X, = X, = X, = 8% X2 = 20% %3D X, = 4% X, = 4% X, = 5% X = 5% Fig. 1-Single-line diagram for the system in problems 1-A, 1-B, and 1-C (a) The system's Thevenin equivalent positive-, negative-, and zero-sequence networks (b) The fault current (p.u.) at phase A
3. When a major fault occurs, in order to stabilize the power system, the system immediately uses . automatic generator control b. governor control c. automatic dispatch d. relays 4. during a major hurricane, a lightning strikes a transmission line carrying power from Oregon to California. The frequency of the power system in California will a. increase above 60HZ b. Fall below 60 Hz c.) Stays the same.
high voltag, please give the correct answer as soon as possible
2.7. According to university regulations, the maximum sound intensity level of backup generators in the campus is 90.0 dB. The 32 identical generators produce a sound intensity level of 92.0 dB when all in operation. Calculate the (1), intensity of one generator. (i1). number of generators that can be installed around the campus if some of the buildings needs multiple generators to bring the university in compliance with the regulation.
(Q.2) For the following network, calculate the fault currents (IF1, IF2, IF3 and IF.) in pu and in kA, and fault MVA (ie. short-circuit level) at the indicated locations. Internal reactance of generators are j0.9 pu. Base quantities: 11 kV, 400 MVA on the generator side. 113.3 kV 4 MVA, 7% j0.5 2 j0.4 2 300 A 200 A 11 KV 250 MVA
Match the following. Fault clearing time Choose. Choose. Relay Sum of CB Opening time and arcing time High speed circuit breakers Tripping times between three and eight cycles Tripping times between three to eight minutes Monitoring device which gives instructions to Circuit breaker Making and breaking device tripping time between one second to eight second Sum of relay pickup time, CB Opening time and arcing time Sum of Relay pickup time and arcing time Circuit Breaker
[3 2 11 BUS ZBus=j|2 4 2 Ω L1 2 3]
I. Further simplify this diagram to a Thevenin model with (Vf) as the generator. 2. Determine the per unit current flowing and the actual current that flows through the fault switch when closed (assume Ibase is 251 A). 3. Describe the operational features of power relay and circuit breaker designed to protect a radial power feeder, include in your description forms of protection provided by the relay and methods of obtaining line data