P4. A 75kVA, 1-phase, 7620V/240V, X = 6%, delivers power to 10 homes. Provide an approximation of how much fault current will flow through the secondary side of the unit if a fault occurs downstream. Amps
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- Last time i got wrong please help meA short circuit occurs in the series R-L circuit with V = 20 kV, X = 8 ohm, and R = 0.8 ohm. The circuit breaker opens 3 cycles after fault inception. Determine (a)the rms ac fault current(???), (b)the rms “momentary” current(????), at ?=0.5cycle, which passes through the breaker before it opens, and (c)the rms asymmetrical fault current that the breaker interrupts.A 30-MVA alternator with 15% reactance is connected to a bus bar. A second alternator rated 25-MVA with 10% reactance is also connected through a 10% bus bar reactor to the same bus bar. Both of these reactances are based on 25 MVA. If a feeder taken out from the bus bars through a circuit breaker develops a 3-phase fault, what should be the appropriate MVA rating of the circuit breaker?(325 MVA)
- 158 min 45 secs A 12 MVA, 132/6.6 kV, transformer having a reactance of 0.15 pu is fed from an infinite bus. The transformer feeds two motor each 6 MVA, 6.6 kV. Each motors has a transient reactance of 0.14 pu and a subtransient reactance of 0.30 pu based on its own rating. A three phase balanced fault OCcurs at the terminals of one motor as shown in the figure below. Find the subtransient fault current and subtransient current in breaker. M1 132/6.6 KV CB Infinite Bus Fault Type your answer hereShow a systematic solution in finding a the rms value of the fault current.(5) Primary AC Source Transformer Secondary AC/DC Full-wave Rectifier Capaictor in Non- linear Load Figure 6 Analyse different methods of harmonics mitigation to eliminate the harmonic, which you have identify in above power system circuit. You can use harmonic filters, K or equivalent transformers or oversized neutral method depending upon the harmonic sources.
- Description In the particular case of figure below derive both the critical clearing angle and the critical clearing time. P, = Pmaz sin d Pm A1 do der Smar A generator having H = 6.R MJ/MVA is delivering power of 1.0 per unit to an infinite bus through a purely reactive network when the occurrence of a fault reduces the generator output power to zero. The maximum power that could be delivered is 2.5S per unit. When the fault is cleared, the original network conditions again exist. Determine the critical clearing angle and critical clearing time. (Roll=PQRS)The bus bars of a power station are in two sections A and Bseparated by a reactor. Connected in section A are two 12MVA generators of 15% reactance each and to B, 8 MVAgenerator of reactance 10%. The reactor is rated 8 MVA and15% reactance. Two feeders are connected to bus bar Athrough transformers, each rated at 4 MVA and 5% reactance.Determine the maximum short circuit MVA with which circuitbreakers on the outgoing side of the transformers have todeal.A 3-phase, 6 MVA, 6.6 kV generator has a reactance of 0.1 pu. It is connected through a 6 MVA, 6.6/33 kV, 0.09 pu reactance transformer to a transmission line having a resistance of 0.09 ohm and a reactance of 0.36 ohm per km. A 3-phase dead short circuit occurs at a distance of 10 kms from the transformer. The generator voltage at the time of fault is 7.2 kV. Find the fault current in the generator.
- Even though the fault current is not symmetrical and not strictly periodic, the rms asymmetrical fault current is computed as the rms ac fault current times an asymmetry factor, which is a function of _______.The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) FalseThree single-phase two-winding transformers, each rated 25MVA,34.5/13.8kV, are connected to form a three-phase bank. Balanced positive-suence voltages are applied to the high-voltage terminals, and a balanced, resistive Y load connected to the low-voltage terminals absorbs 75 MW at 13.8 kV. If one of the single-phase transformers is removed (resulting in an open connection) and the balanced load is simultaneously reduced to 43.3 MW (57.7 of the original value), determine (a) the load voltages Va,Vb, and Vc; (b) load currents Ia,Ib, and Ic; and (c) the MVA supplied by each of the remaining two transformers. Are balanced voltages still applied to the load? Is the open transformer overloaded?