An LRT train is scheduled to travel from KJ10 station to KJ11 station within 4 minutes (including stop time at KJ10 for 30 sec). The retardation is 0.8 km/hr/sec. The train was designed for maximum speed of 80 km/hr. Determine the scheduled speed and minimum acceleration for the LRT train.
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- Find 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% PSMThe figure shows the single line diagram of a single machine infinite bus system. O Infinite bus The inertia constant of the synchronous generator H = 5 MW-s / MVA. Frequency is 50 Hz. Mechanical power is 1 pu. The system is operating at the stable equilibrium point with rotor angle ō equal to 30°. A three phase short circuit fault occurs at a certain location on one of the circuits of the double circuit transmission line. During fault, electrical power in pu is Pmax sin ō. If the values of ō and do / dt at the instant of fault clearing are 45° and 3.762 radian/s respectively, then Pmax (in pu) is_Most buses in a typical power-flow program are a.voltage controlled bus b.PQ bus c.PV bus d.Slack bus 2-The power-flow problem is the computation of voltage magnitude and phase angle at each bus in a power system under balanced three-phase steady-state conditions. False True 3-The following sequence currents were recorded in a power system under a fault condition Ipositive=j1.5pu, Inegative=–j0pu, Izero=– j0pu. The fault is a.Three-phase b.Double Line to ground c.Line to ground d.Line to line 4- he following sequence currents were recorded in a power system under a fault condition Ipositive=j1.5pu, Inegative=j0pu, Izero=j0pu. The fault is a.Three-phase b.Double Line to ground c.Line to ground d.Line to line i uploded the houndots (book )here :https://seomidea.com/hct/nu.pdf
- 3c.The initial load angle at steady-state stability is δ0 and the related mechanical power, P0. With the occurrence of a transient fault the load angle advances to δ1 with a corresponding electrical power of P1. After the successful clearance of the fault the load angle moves to δ2 and electrical power, P2. Use the given information to answer the following questions. Derive equations for: i) the accelerating area. ii) the decelerating area iii) the critical clearing angleQ-5-) 60 Hz generator supplies 0.50 Pmax power to a busbar with infinite power over a conveying line. When a fault occurs, the reactance value between the generator and the infinite bus becomes 400% times the value before the fault. When the fault is isolated, the maximum power that can be transferred generator to the endless bus is 75% of the original (initial) maximum value. Accordingly, using t area criterion method, calculate the critical clearance angle of the system. 00Q2) Actual operating time of an induction type over current relay is 0.9 sec., the fault current 4 KA and C.T. ratio is 400/5. a) Find the current setting, if the time multiplier setting is 0.3. b) Find the plug setting multiplier of the over current relay if the fault current 2000A, current setting 50%, and CT. ratio 400/5. c) Draw a curve between time of operation and plug setting multiplier for TMS 0.5. Fig. below shows the curve between time of operation and plug setting multiplier of a typical relay. 12 10 Operating time (Seconds)- 4 8 6 2 0 2 4 6 8 10 12 14 16 18 20 P.S.M.->
- Critical clearing time of a fault in power system is related to steady state stability limit True FalseThe figure below shows the one-line diagram of a four- bus power system. The voltages, the scheduled real power and reactive powers, and the reactances of transmission lines are marked at this one line diagram (The voltages and reactances are in PU referred to 100 MW base. The active power P2 in MW is the last three digits (from right) of your registration number (i.e for the student that has a registration number 202112396, P2 =396). [10] Starting from an estimated voltage at bus 2, bus 3, and bus 4 equals V2 (0) = 1.15<0°, V3 = 1.15 < 0°, V4 1.1< 0°. 1- Specify the type of each bus and known & unknown quantities at each bus. 2- Find the elements of the second row of the admittance matrix (i.e. [Y21 Y22 Y23 Y24]). 3- Using Gauss-Siedal fınd the voltage at bus 2 after the first iteration. 4- Using Newton-Raphson, calculate: |- The value of real power (P2), at bus 2 after the first iteration. Il- The second element in the first row of the Jacobian matrix after the first iteration. 2 P2…The system values are given below. The bus 1 voltage after fault = 1.5 p.u The bus 2 voltage after fault = 1.2 p.u The line admittance between bus 1 and bus 2 (Y12 ) is = 0.8 p.u The post fault current current flow between bus 1 and 2 is ..............
- Q2. Figure Q2 shows a 300 MW, 50 Hz generator transmitting 280 MW real power to an infinite bus through double transmission lines. A three-phase fault occurs at point P in the middle of one of the transmission lines. (i) Write the generator output power-angle equation per unit for pre-fault, during fault and post-fault conditions. (ii) Determine the critical clearing angle using equal criteria method E=1.05 p.u X'=j0.12 p.u X=j0.17 p.u @ Figure Q2 Xime=j0.6 p." Xime=j0.6 p.u P * V=1.0 p.uA Synchronous Generator is running on of its rated load in a powerhouse to supply for auxiliary mechanical load, meanwhile due to failure of some mechanical drives of powerhouse, the generator goes in a sudden overload condition. (a)Interpret the concept, how will you cope with the situation to avoid the risky condition of generator protection and discuss about the consequences of OC relay protection if applied in above scenario. (b) Suppose you suggest for a Simple differential relay to cope with above situations with nominal ratio of CT-1 to be integrated as 500:1 with the excitation current of CT core to be 2.6 A and nominal ratio of CT-2 as the same 500:1 with the excitation current of CT core to be 3.6 A. Discuss about the accuracy measure of CT's and any risk of Maloperation, if the overload current of 3002 A is flowing in the Generator winding?A system contains three non-identical 30 MW generating units each with a 5% FOR and one 50 MW unit with a 6% FOR. The system peak load for a specified 100 day period is 120 MW. The load-<iuration curve for this period is a straight line from the 100% to the 80% load points.Calculate the energy index of reliability for this system. The economic loading order for this system is the 50 MW unit first, followed by the 30 MW units A, Band C, in that order. Calculate the expected energy provided to the system by the 50 MW unit and by the 30 MW unit C.