Physics

Physics, 31.07.2019 14:50, raishagibson

As the phase angle is decreased, the power factor is

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Physics, 29.06.2019 20:10, htx88

Aparticular 60 hz ac induction motor requires some phase delay to operate properly. the real power is 60 kw under a full load that includes real work, heat, vibration and noise. the motor was designed to operate with an 85% power factor (pf) when fully loaded, because some phase difference between voltage and current is necessary to establish the magnetic field in the motor. compute the motor's effective resistance r (with units) given the real power consumed at 240v ac is 60 kw a) b) to produce a capacitive reactance x-1 ohm, what capacitance would be needed at c) 60 hz? (4 pt) compute the capacitive reactance x that must be added in order to increase the power factor to 100% for 240 v and give units.

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Engineering, 22.10.2019 19:50, Nowellkwaku

Athree-phase wye-connected synchronous generator supplies a network through a transmission line. the network can absorb or deliver power while maintaining its terminal voltage constant. the four-pole, 60 hz generator data rating are 40 mva and 26 kv with a 0.85 p.u. reactance. the field current of the generator can be adjusted to regulate the excitation (induced) voltage from 0.75 to 1.5 times the rated voltage. the network voltage rating is 24 kv. the transmission line impedance and length are 0.07+j0.5 ω/mi and 8 mi. (a) calculate the generator induced voltage versus power factor, if the network voltage is at the rated value, and the bus absorbs the generator rated power. after this, plot the voltage regulation of the system versus the power factor. use the induced voltage and network voltage for plotting the voltage regulation. the leading power factor varies from 0.5 to 1. what power factor corresponds to 10% regulation? (b) plot the maximum power (power angle is 90°) versus induced voltage. determine the required induced voltage that allows the safe transfer of maximum power from the generator to the network (not to exceed the generator rating). assume that the network voltage is the same as in part (a). the excitation voltage is the variable.

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Physics, 29.10.2019 21:31, zacharyminnick123

A74kv (line-line) three phase short transmission line is 24km long. the line has a per-phase series impedance of 0.1+0.5j ω/km. shunt capacitors are installed at the receiving end to improve the line performance. the line delivers 100mva, 0.8 lagging power factor at 64kv (line-line). question 1 determine the sending end voltage angle δ in degrees when the sending end voltage is 74kv. assume the receiving end voltage angle is 0 deg.

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Engineering, 10.11.2019 03:31, jesusmojica25

Two three-phase generators supply a three-phase load through separate three-phase lines. the load absorbs 30 kw at 0.8 power factor lagging. the line impedance is (1.4 + j1.6) ω per phase between generator g1 and the load, and (0.8+j1) ohm between generator g2 and the load. if generator g1 supplies 15 kw at 0.8 power factor lagging with a terminal voltage of 460 v line-to-line, determine

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