Question

In: Electrical Engineering

A three phase synchronous motor is Y-connected with the following values: 2.3 kV, 400 hp, 60...

A three phase synchronous motor is Y-connected with the following values: 2.3 kV, 400 hp, 60 Hz, 8 poles with a rated pf of 0.85 leading. It is 90% efficient at full load with an armature resistance of 0.80 Ohms and synchronous reactance of 11 Ohms. At full load calculate the output torque, and internal generated voltage (EA)

Solutions

Expert Solution

solution:

excitation emf = 2067.55 V

developed torque = 3517.91 Nm


Related Solutions

A 1-MW, three-phase, star connected, 3.3-kV, 24-pole, 50-Hz synchronous motor has a synchronous reactance of 3.24...
A 1-MW, three-phase, star connected, 3.3-kV, 24-pole, 50-Hz synchronous motor has a synchronous reactance of 3.24 ohms per phase. The armature resistance may be ignored. This motor is energized from 3.3-kV infinite bus bars. The field excitation is adjusted until unity power factor at rated load is achieved. Compute the maximum power and torque that the motor can deliver with the excitation remaining unchanged
A three phase, 60 Hz, 480 V, Y-connected, two-pole synchronous generator has a synchronous reactance of...
A three phase, 60 Hz, 480 V, Y-connected, two-pole synchronous generator has a synchronous reactance of 0.95 Ω per phase. Its armature resistance is negligible. Its combined friction and windage losses are 1.3 kW and its core losses are 0.95 kW. The field current is constant at no-load. Its full load armature current is 55 A at 0.9PF lagging. Assume phase voltage is a reference. Determine following: a) Its terminal voltage when it is loaded with the rated current at...
396 v, 60 Hz, 600 hp, 0.6 pf-leading, four-pole triangle connected synchronous motor has 0.9Ω synchronous...
396 v, 60 Hz, 600 hp, 0.6 pf-leading, four-pole triangle connected synchronous motor has 0.9Ω synchronous reactance. Friction; wind; core losses and armature resistance are neglected. a) If the motor is operating under magnitude of phase current (ia) 216 Ampere and power factor of 0.6 lagging, 1. Find the input power of motor in hp ( 2. Find the generated voltage, EA 3. Find the torque and the maximum inducible torque in current state. b) If EA is increased by...
Q3) A three-phase, Y-connected, 220 V, 13 kW, 60 Hz, six-pole induction motor has the following...
Q3) A three-phase, Y-connected, 220 V, 13 kW, 60 Hz, six-pole induction motor has the following parameter values in Ω/phase referred to the stator: R1 = 0.3 Ω. R2' = 0.15 Ω X1 = 0.5 Ω. X2'= 0.21 Ω Xm = 13.25 Ω The total rotational losses are 450 W. The core loss is lumped in with the rotational losses. For a slip of 0.02, and based on approximate equivalent circuit, determine: (i) The rotor speed. (ii) The stator current....
Consider two equal non sallent pole three phase 60 cycle Y connected 6600 volt 10000-kva synchronous...
Consider two equal non sallent pole three phase 60 cycle Y connected 6600 volt 10000-kva synchronous generators, each wuth an effective resistance of 0.063 ohm per phase and a synchronous reactance of 1.52 ohm per phase. Assume that the resistances and reactances of the generators are constant. These generators in parallel carry an inductive load of 18000 kva at 0.9 power factor. (a) find the excitation voltages of the generators and their power angles when they share the kw load...
A three-phase motor is delta connected to a 415 V, 60 Hz line. If the line...
A three-phase motor is delta connected to a 415 V, 60 Hz line. If the line current is 25 A and the motor power factor is 0.75, how much power is consumed by the motor (a) Determine the size of the bank of three capacitors to improve the power factor of the motor to 0.95. The capacitors are delta connected. (b) If two of the motors work together, what is the size of capacitors to correct the power factor to...
1. 414 Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole triangle connected synchronous motor has 0.9Ω...
1. 414 Volt, 60 Hz, 600 hp, 0.6 pf-leading, four-pole triangle connected synchronous motor has 0.9Ω synchronous reactance. Friction; wind; core losses and armature resistance are neglected. a) If the motor is operating under magnitude of phase current (ia) 234 Ampere and power factor of 0.6 lagging, 1. Find the input power of motor in hp (10p) 2. Find the generated voltage, EA (10p) 3. Find the torque and the maximum inducible torque in current state. (10p) b) If EA...
6.9 A3 ϕ, 11 kV, 60 Hz, 25 MVA, Y-connected cylindrical-rotor synchronous machine generator has Ra...
6.9 A3 ϕ, 11 kV, 60 Hz, 25 MVA, Y-connected cylindrical-rotor synchronous machine generator has Ra = 0.45 Ω per phase and Xs = 4.5 Ω per phase. The generator delivers the rated load at 11 kV and 0.85 lagging power factor. Determine the excitation voltage, Ef, for this operating condition. 6.11 The synchronous machine in Problem 6.9 is operated as a synchronous motor and it is drawing rated MVA at 0.85 lagging power factor. Determine the excitation voltage, Ef,...
A three phase 30 hp 460 volt 60 hz, 1770 rpm design B induction motor with...
A three phase 30 hp 460 volt 60 hz, 1770 rpm design B induction motor with class F insulation and service factor of 1.0 is operating at rated shaft load in a 40 degree C environment and has an expected 20 yr life. A maintenance check shows line to line voltages to be 449.2 V, 431.3 V and 462.4 volts. The percent unbalanced voltage for this motor is: the expected temperature rise equals? The expected insulation life equals? the rerating...
Plate values of a three-phase transformer are given below: 1600 kVA, 15 kV / 0,4 kV,...
Plate values of a three-phase transformer are given below: 1600 kVA, 15 kV / 0,4 kV, 50 Hz, i0 = 1.2%; ukN= 6%, idle losses 2450 W, rated power copper losses 14500 W; Dy5 connected.. III) If there is 75% load in the power factor with 0.85 inductance and 0.85 capacity. At what times of the day can capacity loading be seen? What solution should be applied to prevent voltage change? IV) Draw the fastening group. How can this transformer...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT