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- N K © M =] v : @& docs.google.com/forms/d/¢ 2 Add file Q 1/ B) What is the work of Commutator . * &2, Add file Q 2) The following information is given for a 300-kW, 600-V, long-shunt compound generator : Shunt field resistance = 75 Q, armature resistance including brush resistance = 0.03 Q, commutating field winding resistance = 0.011Q, series field resistance = 0.012 Q, diverter resistance = 0.036 Q. When the machine is delivering full load, calculate the voltage and power generated by the armature * 2 Add file Q 3) A four pole aenerator havina - >With an elegant drawing, explain the characteristics of the dynamic operation of the device used in high power applications.Discuss the economic advantages of electric drive
- A d.c series machine rated at 200V, 100A has an armature resistance of 0.1Ω and field resistance of 0.15 Ω . The friction and windage loss is 1500W . Use a Vbase of 200V and an Ibase of 100A . Use the above information to answer the questions below. a.Calculate the per unit value of the total series resistance of the machine. b. Calculate the per unit value of the friction and windage loss. c. Calculate the per unit value of the total series resistance loss at the rated load. d. Calculate the per unit value of the total power loss at the rated load. e. Calculate the per unit value of the efficiency of the machine .A 50MVA, 11kV salient pole machine having a direct‐axis reactance of 0.8pu and a quadrature‐axis reactance of 0.6pu. The machine is connected to an infinite bus having a voltage of 11kV and supplying 40MW at 0.8 lagging power factor. Determine the power angle, the voltage proportional to field current, the direct axis and the quadrature‐axis components of the voltage and current. The load angle and the excitation voltage at which the maximum power transfer occurs.A d.c. shunt machine has armature and field resistances of 0.025 Ω and 80 Ω respectively. When connected to constant 400-V bus-bars and driven as a generator at 450 r.p.m., it delivers 120 kW. Calculate its speed when running as a motor and absorbing 120 kW from the same bus-bars
- 5. A 250 V shunt generator has a full load armature current of 40 A, under these conditions the losses are: FW = 200 watts, shunt field = 100 watts, core = 260 watts, brush contact = 120 watts, armature copper = 400 watts. For operation at maximum efficiency, when the constant losses are equal to those losses that vary as the square of the load, calculate the maximum efficiency.A 32kW, 250V DC shunt machine has an armature and field resistances of 0.05Ω and 120Ω respectively. Determine the total armature power developed when working as generator delivering 32kW output.A. Explain briefly the difference between power flow analysis and state estimation. B. Comments on this statement: "PMUS without GPS signal are useless".
- The nominal speed of a construction machine with an operation is 1000 rpm, and when the speed of the construction machine is halved, the power of the electrical machine is halved. What are the characteristics of the electrical machine and the work machine that should be preferred for such a system?DC GENERATOR. A 250 V shunt generator has a full load armature current of 40 A, under these conditions the losses are: FW = 200 watts, shunt field = 100 watts, core = 260 watts, brush contact = 120 watts, armature copper = 400 watts. For operation at maximum efficiency, when the constant losses are equal to those losses that vary as the square of the load, calculate the maximum efficiency.Include complete solution.Electrical Engineering Dep. Electrical Machine Lab. NO LOAD CHARACTERISTIC OF DC MOTORS DISCUSSION 1- Comment on the curves obtained . 2- What are the types of the losses in the DC machines?