A 16-cylinder, 39.37cm x 55.88cm x 327-rpm, 4-cycle stationary, diesel engine is connected to a 3,125 KVA (80% Power Factor) generator. It also drives a 30-kW exciter. Assume a generator efficiency of 92% and determine the Break-Mean-Effective-Pressure (BMEP), in kg/cm2, at rated load.
Q: Q1:A: The following data apply to a 100-kW 250-V six-pole, 900-rpm compound generator (long-shunt…
A: Output is 100kWatt and 250 watt. So output current is 100 kW250=400 A It is a long shunt…
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A: 3φ synchronous generator,4MVA,12kVZs=0.8+j30 ΩZs=R+jX ΩR=0.8Ω
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A: Given Data: Vt = 220 V IL = 500 A Rsh = 110 ohm Rse = 0.002 ohm Ra = 0.01 ohm
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A: The solution can be achieved as follows.
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Q: Q1. shunt generator delivers a full-Hoad outpu power of 8 Kw at 200 v. It has an armature and shunt…
A: We are authorized to answer one question at a time, since you have not mentioned which question you…
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A: Referring to the question, the information are provided as:
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A 16-cylinder, 39.37cm x 55.88cm x 327-rpm, 4-cycle stationary, diesel engine is connected to a 3,125 KVA (80% Power Factor) generator. It also drives a 30-kW exciter. Assume a generator efficiency of 92% and determine the Break-Mean-Effective-Pressure (BMEP), in kg/cm2, at rated load.
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- 2.2 A three-phase synchronous generator has a reactance of 1.5 p.. and negligible resistance. It supplies a rated current of 1.0 p.. at 1.0 p.u. terminal voltage to a lagging load of 0.9 power factor. Determine the rated excitation voltage in p.u. and the internal load angle. Construct the performance chart of the generator in 2.1 (above) assuming its rating is 450 MVA.Two identical 2000 kw alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz, What is the system frequency such that maximum load that can be delivered without overloading either machine?Terminal voltage of shunt G1 generator in idle operation is 500 V. The terminal voltage of the G1 generator drops to 470 V if it delivers a load current of 600 A. The idle operating voltage of the shunt G2 generator is 505 V. G2 generator terminal voltage drops to 470 V in case of 400 A load current. These two generators are connected in parallel to feed a load of 400 kW. Voltage-power characteristics of generators are linear. According to this; a. Draw the connection diagram given in the question. b. Obtain the network voltage and the powers of the generators. c. Calculate the current given by each generator to the load.
- Two identical 2000 kW alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz, What is the maximum load that the second generator can be delivered without overloading the first machine?Two identical 2,000 kW alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz. What is the maximum load that can be delivered without overloading either machine?A 50-MVA, 30-kV, three-phase synchronous generator has a synchronous reactance of 8 Ohms/phase and negligible armature resistance. The generator is delivering 50 MVA at 0.8 pf leading to an infinite bus at the rated voltage. Determine the excitation per phase E and the power angle &. Select one: O a. E = 22.78 KV and 8= 15.67 deg. O b. E = 14.115 KV and 8= 25.85 deg. O c. None of these O d. E = 13.96KV and 8= 29.74 deg. O e. E = 27.47KV and 8= 22.84 deg. Impedances are marked in perunit on a 100MVA, 100 KV base. The load at bus 2 is S2= 16MW - 132 MVAR, and the load at EN ? 1:4 4/1- TOSHIBA
- Discussion:- 1. What do you understand by "armature- reaction"? Discuss the effect of armature reaction in an alternator when it is loaded with resistive, inductive and capacitive loads. 2. Give the value of voltage regulation for different power factors at full load current and interpret their values.two synchronous generators are connected in parallel, feeding a load together. the frequency of the first generator in the no-load State is 52 Hz and the slope of the characteristic is 1 MW/Hz. the total power of the load fed by these two generators is 2.5 MW and the power coefficient is 0.6 inductive. by drawing the characteristic curve of the system;a) what is the frequency of the system when the load in question is fed, and how do the two generators share the load between themselvesb) if a load of 0.5 MW is added to the system, find the operating frequency of the new system and the powers given by each generatorc) if a second load of 0.5 MW is connected to the system, the idle operating frequency of the second generator is increased by 0.5 Hz, what happens to the operating frequency of the system and the power values given by the generatorsPROBLEMS 3.1. A three-phase, 318.75-kVA, 2300-V alternator has an armature resistance of 0.35 N/phase and a synchronous reactance of 1.2 n/phase. Determine the no-load line-to-line generated voltage and the voltage regulation at (a) Full-load kVA, 0.8 power factor lagging, and rated voltage. (b) Full-load kVA, 0.6 power factor leading, and rated voltage.
- 2.41 A three-phase 25-kVA, 480-V, 60-Hz alternator, operating under bal- anced steady-state conditions, supplies a line current of 20 A per phase at a 0.8 lagging power factor and at rated voltage. Determine the power triangle for this operating condition.Show that an alternator running in parallel on constant-voltage and frequency bus-bars has a natural time period of oscillation. Deduce a formula for the time of one complete oscillation and calculate its value for a 5000-kVA, 3-phase, 10,000-V machine running at 1500 r.p.m. on constant 50-Hz bus-bars. The moment of inertia of the whole moving system is 14,112 kg-m2 and the steady short-circuit is five times the normal full-load value. ANSWER IS [1.33 second]Determine the efficiency of a 1500kVA, 2300 V, 3 phase, Y-connected alternator, which operatesat rated output with a power factor of 80%. The DC armature resistance at 70°C betweenterminals is 0.08 ohm. The field takes 70 A at 120 V from the exciter equipment. Friction andwindage losses are 15kW, iron loss is 35kW and stray load losses is 1.5kW. Assume the effectivearmature winding resistance is 1.5 times the DC value.