With the Clarke’s transformation, can we keep the mmf produced by the new two-phase winding the same as the mmf produced by its original three-phase winding? Give your explanation.
With the Clarke’s transformation, can we keep the mmf produced by the new two-phase winding the...
If we have a single phase transformer, and we keep the primary voltage constant. what is the affect of the three types of loads in the secondary side(resisitive,inductive and capacitive) on the secondary winding.
Is there any application of three-phase symmetrical components transformation for the performance analysis of electric machines? Give your explanation.
According to the equivalent circuit of a three-phase induction motor, can we deduce the formulas for electromagnetic torque calculation? Give your explanation.
Problem 3. A three-phase transformer is constructed using three single-phase two-winding trans- formers, each has the same ratings of 500 MVA, 15/240 kV, and leakage impedance of XT.p.u 0.2 p.u The high-voltage side of the three-phase transformer is connected to a three-phase Y-connected load that absorbs 1000 MVA at 0.9 power factor (lagging). The phase-a voltage across the load is Van 2402(0) kV. Answer the following questions. [10 points] a) Calculate the phase-a voltage at the low-voltage side (denoted by...
3) A two-winding transformer, three phase, 345/230 kV has a single phase capacity of 500 MVA: (a) Determine the total 3-phase capacity, if it is connected as Auto-XMR (b) Determine the voltage and current capacity per each phase Js. LI V, s, V
4. Consider a stepper motor with two phases. Phase 1 is wound with two identical coils. Phase 2 is also wound with two identical coils. Therefore, there are eight wires that come out from the stator winding, four for each phase (a) Connect the phase terminal wires in such a way that the motor can be used as a unipolar wound motor and draw:a schematics for the amplifier circuit of the motor windings (b) Connect the phase terminal wires in...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a winding resistance of 0.3 Q and a synchronous reactance of 0.6 on a per phase basis. Determine its voltage regulation at full load when the power factor is (a) 75% lagging and (b) 75% leading. B) (10 marks) A 220-V, Y-connected, three-phase, synchronous motor has a synchronous reactance of 4 O/phase and negligible armature winding resistance. At a certain load the motor takes 7.5...
2. [25 points] The following figure shows the phase diagram of Cu-Ag alloy system. A mixture of Ag and Cu with a eutectic composition (or concentration) is heated to a high temperature and keep for enough time to prepare the material into a uniform liquid state. The material is then cooled down to 800°c. Cu-Ag System 1200 Liquid 800 A 600 400 100 80 60 40 20 wt% Ag a) What is the Ag composition in the original material so...
1. If 480 volts is applied to the primary winding of a transformer which has 300 turns in the primary winding and 15 turns in the secondary winding, the secondary voltage will be A. 0.0417 volts. C. 56.8 volts B. 24 volts. D. 9600 volts. 2. A distribution transformer with a grain-orientented steel core is highly efficent because its A. exciting current is sufficiently high. B. flux direction is parallel to the stell-rolling direction C. permeability is increased due to...
2. [25 points] The following figure shows the phase diagram of Cu-Ag alloy syst em. A mixture of Ag and Cu with a eutectic composition (or concentration) is heated to a high temperature and keep for enough time to prepare the material into a uniform liquid state. The material is then cooled down to 800°C. Cu-Ag System 1200p Liquid 1000 800 A B. 600 400 200 100 80 60 40 20 wt% Ag (o) What is the Ag composition in...