A three-phase, Y-connected synchronous generater supplies current of 10 A having phase angle of 20º lagging at 400 V. Find the load angle if Xs = 10 ohms per phase. Assume Rs to be negligible. Also, calculate the total generated real and reactive power.
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A three-phase, Y-connected synchronous generater supplies current of 10 A having phase angle of 20º lagging at 400 V. Find the load angle if Xs = 10 ohms per phase. Assume Rs to be negligible. Also, calculate the total generated real and reactive power.
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- The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsA synchronous generator has been synchronized to an infinite grid of 13.8 kV and 60 Hz. The generator prime mover C/C is such that the no-load frequency is 62.5 Hz and the power slope is 1 MW/Hz. The AVR C/C (The reactive power against the terminal voltage C/C) is such that the zero reactive power voltage is 14.6 kV, while the slope is 0.4 MVAR/kV. Calculate: (a) the kVA loading of the generator and its power factor. (b) the settings of the prime mover and AVR such that the generator delivers 3 MW at 0.85 lagging power factor.6.5% ans ex A so kvA. 2o00/20 V, So He single-phase transformar has impedance drof of8% and resistance drop of 4%. Caleulate. The Requlation of the Thams former at full- Load o8 P.s Legging. also find The Power factor at which Voltage requlation will Be Zero. Sols 0.5 leading. s alculate The % Noltege Requlation af atransformar in w hich the Percantage resistance drof is 1% and Percentage dre is 6% when The Power fador is 0.8 lagging ) > unity aMS 38 % ans 1 % (シ→ 0.8 leading . amS - 2.2%
- 1980628cmid 11616 For reactive load, the power factor is equal to Select one: O a. 1 O b. 90 O c. 2 O d.0 If the voltage V, = 800 mV, then the current flowing in the primary winding Ip is: j2on Select one: O a. None of these O b. l, =40<0° mA O c.l, = 0.320<90° A O d. Ip =320<-90° mA if a Load absorbs an average power of 8 kW at a lagging power factor of 0.5 Select one: O a. -8000 + j13856.4 VA O b. None of these O c. 8000 - j13856.4 VA O d. 8000 - j13856.4 VA estion-299141-3 freactive power isThere is an installation with two equal triphasic loads of 300 kVA each and a power factor of 0.9 lagging. When connecting a pure reactive element in parallel, the reactive power at the entrance of the installation is 150 kVARS, with a lagging power factor. We can say that: a) A bank of reactors was connected and the fp deteriorated. b) A capacitor bank was connected and the pf deteriorated. c) A bank of reactors was connected and the fp improved. d) A capacitor bank was connected and the pf improved. e) None of the aboveA parallel connection of a RL branch with a C branch is connected across a 100V AC mains. At first R = 10 ohms, L = 20mH and frequency of 1000rad / s, the current measured is 2.2361A at 89.44 leading power factor. A) Determine the initial capacitance. B) However, a fault occurs on the capacitor branch making its capacitance 20% lower and a resistance of 5 ohms is detected. If this faulty circuit is rerun but at a frequency of 500 rad / s, determine the new current that will flow through the circuit.
- two generators supplying a load. Generator I has a no-load frequency of 62.5 Hz and a slope Sp1 of I MW/Hz. Generator 2 has a no-load frequency of 62.0 Hz and a slope sp2 of I MW/Hz. The two generators are supplying a real load totaling 2.5 MW at 0.8 PF lagging. (a) At what frequency is this system operating, and how much power is supplied by each of the two generators? (b) Suppose an additional I-MW load were attached to this power system. What would the new system frequency be, and how much power would Gl and G2 supply now? Generator 1 VT V2 Generator 2 VTí KVAR KVARThere is an installation with two identical three-phase motors, 50 HP each and a power factor of 0.9 behind. When connecting a pure reactive element in parallel, the reactive power at the installation input is 50 kVARS, with a lagging power factor. We can say that: a) A capacitor bank was connected and the pf improved. b) A bank of inductors was connected and the pf improved. c) A capacitor bank was connected and the pf deteriorated. d) A bank of inductors was connected and the pf deteriorated. e) None of the above.Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Ztoad 500 236.87° ohm , and the transmission line's impedance is Zine = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.
- A synchronous generator is rated 645 MVA, 24 kV, 0.9 pf lagging. It has a synchronous reactance 1.2 . The generator is feeding full load at 0.9 pf lagging at rated voltage. Calculate: (a) Excitation emf (E,) and power angle 8 (b) Reactive power drawn by the load Carry out calculations in pu form and convert the result to actual values.The reactance of a generator is given as 0.1 pu based on the generator of 17 KV, 300 MVA. Determine the pu reactance on a base of 17 KV, 250 MVA. New pu reactance is.......Three single-phase transformers are connected in delta-delta to step down a line voltage 138 kV to 80 kV to supply a manufacturing plant. The plant draws an active power of 24 MW at a lagging power factor of 0.89. Calculate apparent power in MVA drawn by the plant.