2. A group of 20 trunks was found to have ten trunks engaged at 10 a.m., 15 at 10.10 a.m., 16 at 10.20 a.m. and 11 at 10.30 a.m. Calculate the average traffic intensity during this period.
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- The bus impedance matrix of a 3-bus system is: [j0.2295 j0.1494 j0.1506] j0.1494 j0.1954 j0.1046 Lj0.1506 j0.1046 j0.1954] Zbus Draw the reactance diagram, and find the fault current if a 3-ph fault occurs at bus 1. Also find the voltage at each bus during the fault and the current contributions to the fault from buses 2 and 3.Q: in single line diagram of fig (2) below the three bus system. The sequence data for transmission lines and two generators are given in table below. If single line to ground fault occurs at F, calculate the fault current. If the fault impedance is j0.1p.u what will be the fault current? Repeat the calculations for L-L fault occurs. Description Generator - A Generator- B Transmission Line 1 Transmission Line 2 Transmission Line 3 Zero j0.03 j0.02 j0.14 jo.10 j0.12 Sequence Data in pu Positive j0.25 j0.20 j0.08 j0.06 j0.06 Negative j0.15 jo.12 j0.08 j0.06 jo.06 T.L.2 GB T.L.L T.L.3 Fig.(2)Refer to Figure 1. Using its equivalent reactance diagram, what is the total impedance of the system up to the fault point at the end of the receiving line (in per unit)? Below are the parameters: G1 : 9 MVA, 13 kV, j0.11 p.u. G2 : 8 MVA, 13 kV, j0.06 p.u. T1 : 9 MVA, 13/69 kV, j0.042 p.u. TL : 262 km, 0.031 ohm per km, 0.3 ohm per km, operates at 69 Base values are that of G1. Round your answer to 2 decimal places. what is the fault MVA of the system when a three-phase fault occurs at the receiving end?
- In a 7-bus system, the double line fault is occurred at bus -5. During fault the positive sequence potential difference between the bus-4 and bus-1is found to be 0.0175. what is the line impedance which is connected between bus-4 and bus-1 if the current flowing through transmission line is -j 0.148? Select one: O a. -jo.182 O b. +j0.1182 O c. -jo.1182 O d. +j0.182Find the line fault current of the feeders shown in the figure and the T.S.M of Relay 2. Knowing that actual time of operation of Relay 2 is 1.4 Sec, the time margin between the two relays is 0.6 Sec, and the time setting multiplier (T.S.M.) of Relay 1 is 0.4. Use the I.D.M.T curve shown below. Bec 500/5 00/S CB2 Relay 2 160% Relay 1 120% PSMPlease answer this diligently. Other answers in the internet seems wrong. Please help me understand and solve this problem. I'll give a like. Thanks! Isc = __________; MVAsc = __________
- fon alan at Q.1 (a) (b) (i) (c) (i) SEEE/SKEE 4443 (ii) Explain briefly why the Newton-Raphson method is used for large power system? WIT (1) What is the purpose served by power flow analysis? What is Short Circuit Capacity (SCC)? (ii) Using suitable diagram, explain how Thevenin Theorem can be applied in symmetrical fault calculation. What is the magnitude of the neutral-to-ground impedance ZN for a Y connected generator in a zero-sequence diagram? Explain briefly. (ii) Using a symmetrical component method, prove that the fault current for a double line to ground fault, I 31aoConsider the single-line diagram of a power system shown below. The transient reactance of cach part of the system is as shown in table and expressed in p.u. on a common 100 MVA base. A three-phase fault with impedance of 0.16 p. occurs at bus (5). Determine short- circuit capacity (fault level) and short circuit current? Assume the fault voltage at bus (5) equal 112 KVWhich of the following is the busbar type where active power and busbar voltage are input data in power flow and reactive power and phase angle are calculated?a) Current busbarb) Oscillation busbarc) Voltage controlled busbard) Frequency controlled busbare) Suck busf) Load busbar
- 2. What's the primary instrument for locating a break in a cable during emergency maintenance?A. OSAB. OTDRC. MultimeterD. Power meterb) The one-line diagram for a simple power system is given in Figure 1(b). į. Draw the impedance diagram of the system. i. Construct the bus admittance matrix, Xeus and bus impedance matrix, Zous of the system. I. Evaluate the fault current, bus voltages and line current during the flow when a balanced three-phase fault occurs on bus 1. bus 1 bus 2 j65 N G G 25 MVA 25 MVA 13.8 kV 15% 13.2/69 kV 11% 25 MVA 69/13.2 kV 11% 15 MVA 13 kV 15% Figure 1(b) mCalculate the fault current in each phase for a L-G fault occurs at bus at machine-2 for the system shown in below fig.All the reactaces are given in p.u on 100 MVA base E = x4 = j0.2 X2 = 10.2 *0 = J0. 25 Line X1 = x = j0.11 Xp = j0.33 Xa " j0.16 X2 = J0.16 Xo = j0.06 %3D NA %3! %3D X, = x2 = j0.10 X1 = x2 = Xo = 0.10 None -j1.7747p.u -j1.4487p.u -j1.8847p.u