Two turbo altemators with ratings oven delow are interconnected ano feeding a 60 hz frequency grid. Machine 1: 4 pole SoHtz, GOMW/ pover factor o.9 lsgging moment of inertia - 25000 kg-m Machine 2: 2 pole, 50Hz, 80MW, power factor 0.85 lagging, moment of inertia 35,000kg-m? Calcuiate the ineria carstants, H1 and H2 and its cquivalent on a machine base of twrice that of Machinc-2-MVA

Two turbo altemators with ratings oven delow are interconnected ano feeding a 60 hz frequency grid. Machine 1: 4 pole SoHtz, GOMW/ pover factor o.9 lsgging moment of inertia - 25000 kg-m Machine 2: 2 pole, 50Hz, 80MW, power factor 0.85 lagging, moment of inertia 35,000kg-m? Calcuiate the ineria carstants, H1 and H2 and its cquivalent on a machine base of twrice that of Machinc-2-MVA

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.21P: An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor...

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Two generators rated at 2 pole,50 Hz 80 Mw 0.8 pf lag with moment of inertia40000 kg-m2 and 50 Hz, 100 Mw 0.8 pf lag with moment of inertia 10,000kgm2 are connected by a transmission line. Find the inertia constant of eachmachine and the inertia constant of single equivalent machine connected toinfinite bus. Take 100 MVA base.
A 800 V, 120kVA, 3-phase, 50 Hz, salient-pole synchronous generator is used in a hydroelectric dam, converting water flow into electricity via a turbine. The reactance values (Xd and Xq) are 1.95 Ω and 1.10 Ω, respectively and the terminal current is measured to be 95 A at a power factor of 0.85 lagging. The armature resistance can be considered to be negligible (Ra =0). a) Draw the phasor diagram of the generator, b) Compute the generated voltage (Êaf) when the generator delivers its rated kVA at 0.85 lagging power factor and rated terminal voltage. ANS=Eaf=578.05exp(j9.75°)
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A 2 pole, 50Hz, 11kV turbo alternator has a rating of 100MW, power factor of 0.7 lagging. The rotor has moment of inertia of 10000kg-m2. Calculate (i) Energy stored in the rotor (ii) Inertia constant H and (iii) Angular momentum in mechanical radians and electrical radians and electrical degrees.
An inductive coil having a resistance of 15 Ω takes a current of 4 A when connected to a 100-V, 60 Hz supply. Ifthe coil is connected to a 100 -V, 50 Hz supply, calculate (a) the current (b) the power (c) the power factor. Drawto scale the vector diagram for the 50-Hz conditions, showing the component voltages
A turbine has a power coefficient equal to 0.3 when the wind speed is 7 m / s. This turbine is coupled, through a multiplier, to an asynchronous generator of rotor in cage which, in turn, is connected to the distribution network. Considering the data, Air density: 1.25 kg / m3 Blade radius: 15 m Multiplier coefficient: 50 Number of asynchronous generator's pole pairs: 2 Mains frequency: 60 Hz 1% slip Calculate the speed of the turbine rotor (rpm). Is it considered fast or slow?
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The generator voltage varies in time as ε = Va - Vb = εmsinωt, where εm = 120 V and ω = 429 radians/second. The values for the remaining circuit components are: R = 61 Ω, C = 426 μF. The value for L is unkown. What is known is that the voltage across the generator leads the current in the circuit by φ = 48 degrees. 1) What is t1, the first time after t = 0 when the magnitude of the voltage across the inductor is maximum? 4) What is VL,max, the magnitude of the maximum voltage across the inductor? 5) What is VL = Vb - Vc, the voltage across the inductor, at time t = 0? Note that VL is a signed number.
Four e.m.fs e1 = 100 sin ωt, e2 = 80 sin (ωt − π/6), e3 = 120 sin (ωt + π/4) and e4 = 100 sin (ωt − 2π/3) are induced in four coils connected in series so that the vector sum of four e.m.fs. is obtained. Find by calculation the resultant e.m.f. and its phase difference with (a) e1 and (b) e2. If the connections to the coil in which the e.m.f. e2 is induced are reversed, find the new resultant e.m.f
AC electrical circuit is below: (refer picture below) a. Determine the current flowing in the load. b. If it is desired that the system power factor be 0.9. With system frequency = 50 Hz. Determine how large the capacitor is must be installed? Which one is correct? A/B/others answer A. C = 7.7015 mF B. C = 35.243 µF c. Please Draw all the phasor. Please give complete, details, and correct answer. Please do step by step, draw the phasor Please using handwriting (not typing ). THANK YOU, I WILL GIVE MANY THUMBS UP.
A shunt generator has the following open-circuit characteristic at 800 r.p.m.Field amperes : 0.5 1.0 1.5 2.0 2.5 3.0 3.5E.M.F. Volt : 54 107 152 185 210 230 245Armature and shunt field resistances are respectively 0.1 Ω and 80 Ω. The terminal p.d. falls to 175 Vwhen the armature current is 100 A. Find the O.C. volts and the volts lost due to (i) reduction in the fieldcurrent (ii) armature resistance (iii) armature reaction.
An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor lagging. (a) Compute the required kVA rating of a shunt capacitor to improve the power factor to 0.9 lagging. (b) Calculate the resulting power factor if a synchronous motor rated at 500 hp with 90 efficiency operating at rated load and at unity power factor is added to the plant instead of the capacitor. Assume constant voltage (1hp=0.746kW).
السؤال The System y(n)= 5 x(n) + 10 الاجابات Stable Unstable =============== السؤال The System y(n)= Σ x(n) h(n-k) الاجابات Linear Non-Linear ============================== السؤال The Power Signal is one which has finite energy and zero average power? الاجابات True False ==================== The System y(n)= 5 x(n^2) الاجابات Static Dynamic السؤال The System y(n)= 5 x(n) + 10 الاجابات Time Variant Time Invariant