Calculate the range of values for σ when the op amp does not saturate using PSPICE.

Question

2. A 3-phase, 75 MVA, 11-8 kV star-connected alternator with a solidly earthed neutral point has the fol- lowing p.u. impedances based on rated phase voltage and rated phase current : Positive phase sequence impedance Negative phase sequence impedance Zero phase sequence impedance = j 2 p.u. = j 0.16 p.u. = j 0.08 p.u. Determine the steady-state fault current for the following: (i) 3-phase symmetrical short-circuit (ii) one line-to-earth fault (iii) two line-to-earth fault. The generated e.m.f. per phase is equal to the rated voltage. [(i)1840 A (ii) 4920 A (iii) 3580 A]

Answer 1

Question

Chapter 5, Problem 11P

(a)

To determine

Calculate the range of values for σ when the op amp does not saturate using PSPICE.

(b)

To determine

Calculate the current io when σ=0.272 using PSPICE.

Expert Solution & Answer

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Students have asked these similar questions

2. A 3-phase, 75 MVA, 11-8 kV star-connected alternator with a solidly earthed neutral point has the fol- lowing p.u. impedances based on rated phase voltage and rated phase current : Positive phase sequence impedance Negative phase sequence impedance Zero phase sequence impedance = j 2 p.u. = j 0.16 p.u. = j 0.08 p.u. Determine the steady-state fault current for the following: (i) 3-phase symmetrical short-circuit (ii) one line-to-earth fault (iii) two line-to-earth fault. The generated e.m.f. per phase is equal to the rated voltage. [(i)1840 A (ii) 4920 A (iii) 3580 A]

Make sure you indicate clearly the questions attempted Show your work to earn marks. • Enjoy Q1. With the help of a well-drawn diagram, explain concept map of an electromechanical system modelling. [20] Q2. Separately-excited generator develops a no load emf of 150V at an armature spend of 20 rev/s and a flux per pole of 0.1 Wb. determine the generated emf when a. The spend increases to 25rev/s and the pole flux remains unchanged. b. The speed remains at 20 rev/s and the pole flux is decreased to 0.08Wb. c. The speed increases to 24 rev/s and the pole flux is decreased to 0.07 Wb Write short notes on the following term a. Copper loss b. Iron loss c. Friction and Windage losses. [20]

Q4. A 415V, three phase, 50 Hz 4 pole, star connected induction motor ruins at 24 rev/s on full load. The rotor resistance and reactance per phase are 0.35 ohms and rotor respectively and the effective rotor stator turns ratio is 0.85:1 calculate: a. The synchronous speed b. The slip. c. The full load torque. d. The power output if mechanical losses amount to 770 W e. The maximum torque f. The speed at which maximum torque occurs g. The starting torque h. Direct on-line starting i. Star delta starting [20]