Calculate the corona voltage (phase-phase) according to Peek. (m=1, r=2 cm, a=8m) a) 580.33 KV b) 599.19 KV 01100 C) 593.34 KV d) O 595 KV
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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 componentsFill in the table for a correctly wired duplex outlet (U.S. National Electric Code standards for voltage PARAMETER EQUATION and frequency). Note the used of double- subscript notation. You can assume a 0° phase reference for Vba(t). Vba(t) Vea(t) Vbe(t) Vba (Peak Phasor) Vea (Peak Phasor) Vbc (Peak Phasor) Vba (RMS Phasor) Vea (RMS Phasor) Vbc (RMS Phasor) A CQ2. A series of motor (Load 1) and lighting (load 2) are connected to an AC source as shown in Figure Q2. The AC source, Vs, supplies 415420° V with frequency 50 Hz. Based on this information: sa 100 mH 150 Load 1 Load 2 i) Calculate the total load impedance. Vs ii) Calculate the current, I. Figure Q2. (iii) Write the waveform expressions in frequency domain for Vs and I. Draw a phasor diagram consists of Vs and / and state the relationship between Vs and I. (iv) Determine the power factor and calculate the real power, reactive power and apparent power. Establish the power triangle for the load.
- 5.5 kW, 1450 rpm. L-type equivalent circuit and parameters for a continuous sinusoidal phase of a star connected 3-phase ASM with line voltage 220 V and frequency 50 Hz are given as follows, ignoring core (iron) losses: R1=0.21 Ohm, R2=-0.18 Ohm, X1=X2-0.66 Ohm and Xm = 9.9 Ohm How many times the inrush current will be the rated current when the ASM is started directly? Answer options group 8.0815 2.6455 4.3763 7.1534 1.2558 6.3414 5.2280 3.7473Calculate the capacitance of a single phase 50 Hz overhead line 40 km long consisting of two parallel wires each 5 mm in diameter, 1.5 metres apart, taking the effect of ground into consideration. The height of the conductors above ground is 7 metres. Derive any formula used. [A.P.S. Univ. Electric Power Generation, Transmission and Distribution 1978) [Ans. 0.174 pF] AA 13.2 kV, 3 miles transmission line is composed of 336,400 Cmil, 26/7 (Linnet) acsr has GMR of 0.0244 ft and a resistance of 0.306 ohm per mile. The conductors are spaced horizontally 3 ft apart. What is the series impedance? A. 0.918+j 1.385 B0.918+j 1.835 C. 0.918+j 1.538 D. 0.918+j 1.358
- Q2. A series of motor (Load 1) and lighting (load 2) are connected to an AC source as shown in Figure Q2. The AC source, Vs, supplies 415220° V with frequency 50 Hz. Based on this information: 5Ω 100mH : 15 2 Load 1 Load 2 i) Calculate the total load impedance. Vs ii) Calculate the current, I. Figure Q2. Write the waveform expressions in frequency domain for Vs and I. Draw a phasor diagram consists of Vs and / and state the relationship between Vs and I. (ii) (iv) Determine the power factor and calculate the real power, reactive power and apparent power. Establish the power triangle for the load.A 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.Q2. A series of motor (Load 1) and lighting (load 2) are connected to an AC source as shown in Figure Q2. The AC source, Vs, supplies 415220° V with frequency 50 Hz. Based on this information: 5Ω 100 mH 15 Q Load 1 Load 2 i) Calculate the total load impedance. Vs ii) Calculate the current, I. Figure Q2. (ii) Write the waveform expressions in frequency domain for Vs and I. Draw a phasor diagram consists of Vs and I and state the relationship between Vs and I. Determine the power factor and calculate the real power, reactive power and apparent power. Establish the power triangle for the load. (iv)
- Quest- A single phase 50 Hz, system supplies an inductive load of 5000 kw at power factor 0.8 lag through a line 25 km. Resistance of the line is 0.0195 2/km and inductance = 0.36 mH/km, receiving end voltage is 10 kV. A capacitor is connected across the load to get the voltage regulation of 10%. Ratio of transmission line loss with and without shunt capacitor isQ2. A series of motor (Load 1) and lighting (load 2) are connected to an AC source as shown in Figure Q2. The AC source, Vs, supplies 415420° V with frequency 50 Hz. Based on this information: 50 100 mH 150 Load 1 Load 2 i) Calculate the total load impedance Vs ii) Calculate the current, I. Figure Q2. (iii) Write the waveform expressions in frequency domain for Vs and I. Draw a phasor diagram consists of Vs and I and state the relationship between Vs and I. (iv) Determine the power factor and calculate the real power, reactive power and apparent power. Establish the power triangle for the load.In an alternator delivering lagging pf load, the excitation emf leads terminal voltage by the power angle True False The regulation of an alternator is likely to be negative in case of resistive load True False The short circuit characteristic of an alternator is always non- linear True False