Determine the excitation voltage ef and the power angle

Assignment Help Electrical Engineering

Reference no: EM13230759

A 3-phase, 20 kVA, 208 V, 4-pole star-connected synchronous generator has a synchronous reactance of Xs = 1.5 ohm per phase. The resistance of the stator winding is negligible. The machine is connected to a 3-phase 208 V infinite bus. Neglect rotational losses. a) The field current and the mechanical input power are adjusted so that the synchronous machine delivers 10 kW at 0.8 lagging power factor. Determine the excitation voltage Ef and the power angle ?. b) The mechanical input power is kept constant but the field current is adjusted to make the power factor unity. Determine the percent change in the field current with respect to its value in part (a).

Reference no: EM13230759

Questions Cloud

Determine upper and lower control limits for a mean chart : the overall average on a process you are attempting to monitor is 50 units. the process standard deviation is 1.72. Determine the upper and lower control limits for a mean chart, if you choose to use a sample size of 5.

Determine the power to which the motor can be loaded slowly : A 3-phase, 2300 V, 60 Hz, 12-pole, Y-connected synchronous motor has 4.5 ? per phase synchronous reactance and negligible stator winding resistance. The motor is connected to an infinite bus and draws 250 A at 0.8 power factor lagging.

How do you deal with resistance to getting others : The president of the organization asks you to work with the team. 1. How do you explain to them that employee involvement will improve decision making quality? 2. How do you deal with resistance to getting others involved in their territory?

The relative standard deviation in the molarity of the base : What would be the relative standard deviation in the molarity of the base if the standard deviation in the measurement of mass in a.) is .002g and this uncertainty limits the precision of calculation?

Determine the excitation voltage ef and the power angle : A 3-phase, 20 kVA, 208 V, 4-pole star-connected synchronous generator has a synchronous reactance of Xs = 1.5 ohm per phase. The resistance of the stator winding is negligible. The machine is connected to a 3-phase 208 V infinite bus.

Write specifications a method that advances any given date : A date consists of a month, day, and year. Frequently, we represent each of these items as integers. For example, July 4, 1990, is a month 7, day 4, and year 1990.

Design a circuit using only one omp-amp : Design Problem- the circuit must have the following transfer function: Tv(s)=+- (s+125)(s+500)/(s+250)(s+1000) a)design the circuit using two Omp-amps B) design a circuit using only one omp-amp c) design a circuit using no omp amp *in all designs ..

Compute the rms speed of ph3 atoms or molecules : Calculate the rms (average) speed of PH3 atoms or molecules at 123 oC. Use R = 8.314 kg-m2/K-s2-mol for the value of the gas constant. The average speed of a PH3 atom/molecule at 123 oC is 539 m/s.

Describe the additional factors that impact global supply : Based on the concept of globalization, many businesses operate and compete in a global environment. Describe the additional factors that affect/impact global supply chains.

User Account

All Pages