Q3/ Two 50 Hz generators of rating 100 MW and 300 MW are operating in parallel. Each of them has a speed regulation of 5%. They supply a total load of 320 MW. Assume that the speed changers are set to give rated frequency at 100% rated output power. Determine the output power of each generator and the operating frequency.
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- A separately excited generator has no-load voltage of 125V. A certain load rated at 1200W, 120V is then connected at the terminal. Calculate the series resistance needed to connect to the armature circuit in order for the load to operate at rated condition if the armature resistance is 0.0692Ω.A DC shunt generator has a full load output of 10kW at a terminal voltage of 240V. The armature and the shunt field winding resistances are 0.6 and 160 ohms respectively. The sum of the mechanical and core-losses is 500W. calculate the power required in kW at the driving shaft at full-load, and the corresponding efficiency and voltage regulationTwo D.C shunt generations running in parallel supply s total load current of125 A. The shunt field and armature resistances of each machine are 50 ohms and0.4 ohm respectively. The e.m.f.s. of the two generators at no load are 260 Vand 250 V respectively. Determine:(i) Current supplied by each generator: and(ii) The bus bar voltage.
- The armature of a 6-pole separately excited dc generator is triplex wave wound with 534 conductors. This machine delivers power to the load at 200V while being driven at 900rpm. At this load, the armature circuit dissipates 640W. If the flux of this generator is 180-mWb, determine the kW rating of the load served. Assume a total brush drop of 2V.A short shunt compound generator has an armature; series field and shunt field resistances of 0.031Ω, 0.04Ω and 100Ω respectively. At rated load condition, the terminal voltage is 400V while the armature is developing an emf of 409V. Find the kW delivered to the load at rated condition.Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and 1800 rpm. Each winding has an armature resistance of 0.05Q and a synchronous reactance of 0.6Q. Draw the phasor diagram with values, show torque angle and determine the induced voltage for the condition of rated load.
- SOLVE THE PROBLEM, SHOW YOUR COMPLETE SOLUTION AND MAKE SURE THAT THE FINALS ANSWERS ARE IN 4 DECIMAL PLACES. A 20-KW long compound DC generator is rated 240 V. It has a full load efficiency of 78% and stray power loss of 1600 watts. The shunt field and series field resistances are 110 ohms and 0.08 ohm respectively. Find the armature resistance, efficiency at maximum and the load current corresponding to maximum efficiency.Three de shunt generators in parallel running each having an armature resistance of 0.2ohms. running at the same speed and excited to give equal share of total load of 200 kW at a terminal voltage of 500V into a load of fixed machine. If the field current of one generator is raised by 2%, the other remaining unchanged, calculate the output power of each machine and their terminal voltage under this conditions. Assume the speed remains constant and the flux is proportional to field current.Two similar 6,600-V, three phase generators are running in parallel on constant-voltage andfrequency bus bars. Each has an equivalent resistance and reactance of 0.05 Ω and0.5 Ω respectively and supplies one half of a total load of 10,000 kW at a laggingp.f. of 0.8, the two machines being similarly excited. If the excitation of onemachine be adjusted until the armature current is 438 A and the steam supply to theturbine remains unchanged, find the armature current, the e.m.f. and the p.f. of theother alternator.
- Calculate the full load voltage drop due to armature reaction In an experiment load test DC Shunt generator. Obtain the internal curve using the curves above.An 8-pole lap wound d.e shunt generator has 120 slots with 4 conductors per slot. If each conductor can carry 250 A and flux per pole is 50 mWb. Find the speed so that it gives 240 V on open circuit. If terminal voltage of the generator drop to 220 on full load, find the armature resistance.Problem: The field current of a 100-kW, 250V shunt generator is 5A when delivering power at rated terminal voltage and rated load current. The combined armature and brush resistance is 0.1 ohm. 1.)Calculate the generated power in kW. 2.)What is the electrical efficiency? * Formatt: given required solution answer