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ea1 The Primary aud Secondary wind tngs of a 4o kUA, 6fo0/250v Single-Phase thinsforman respectivety tk leakage reactance of the thancformar refferd A 4he have resistanee of lo-2 and o.02 LA Primary side is 35. السول Calculate the fercantage Voldage regulati on full- Laad cumut at ap.f. of og lagging. of the te Transformar when

ea1 The Primary aud Secondary wind tngs of a 4o kUA, 6fo0/250v Single-Phase thinsforman respectivety tk leakage reactance of the thancformar refferd A 4he have resistanee of lo-2 and o.02 LA Primary side is 35. السول Calculate the fercantage Voldage regulati on full- Laad cumut at ap.f. of og lagging. of the te Transformar when

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.54P: An infinite bus, which is a constant voltage source, is connected to the primary of the...

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In order to avoid difficulties with third-harmonic exciting current, which three-phase transformer connection is seldom used for step-up transformers between a generator and a transmission line in power systems. (a) Y- (b) -Y (c) Y-Y
A three-phase 20 MVA, 11 kV generator has a reactance of 10% and is connected via a bank of three single-phase transformers to a transmission line whose series reactance is 100 2. The transmission line is supplying a load of 10 MVA at 10 kV and 0.8 power factor. The transformer bank at the generator end is connected in delta on the generator side and in star on the transmission line side and the transformer on the load side is star-star connected. Each of the single phase transformers in the bank of transformers is rated at 10 MVA, 11/110 kV with a reactance of 8%. Draw the pu circuit diagram for a system base of 10 MVA, 15 kV in the load circuit. Calculate the voltage at the generator terminals.
a) draw the reactance diagram based on values in A busbar. U=29 S=30 b) while the voltage in B busbar is 13kV, 17MW 0.85 inductive power factor in M1, 8MW 0.9 inductive power factor in M2, what should be the terminal voltage in generator? c) to have a 3 phase fault in B busbar, what should be the fault current?
wich of the following three phase transformer configurations is more stable? A-a 3-wire Delta primary whit a 4-wire Wye secondary. B- a 4 -Wire Wye primary with a 4-wire Wye secondary. C- "a" is as stables as "b", D - neither "a" nor "b" is stable. A single phase autotransformer starter used to star a induction motor on a 440-V line applies 65 percent of line voltage to motor during the starting period. If the motor current is 125 A at starting, what is the current drawn from the line? A- 81.25A, B- 125A, C- 192.31A, D- none of the above. All other varibles being the same, the putput voltage of a full-wave rectifier is________________ than the output voltage of a half-wave rectifier? A- Lower B- higher
Q5: A SL-G fault occurs on the low voltage side of a transformer that connects a motor to a generator at generating plant. The rated values for each element are:M: 0.6 kV, 5 MVA, X1 = X2 = 20%, X0 = 4%, grounded through 2% reactance.T: 3-single phase units, each is: (2400 Grounded Y: 600 Δ) V, 2.5 MVA, Xt = 10%.G: 4.16 kV, 7.5 MVA, X1 = X2 = 10%, X0 = 5%, grounded through 5% reactance.Draw the sequences networks and determine the fault current in Amperes. (Take the generator ratings as a base).
Draw the complete circular stator winding for a three phase delta connected AC generator consisting of 4 poles and 24 slots using a parallel connection. Your submission must consist of two drawings as follows: One drawing must show the winding arrangement of the phasegroups in the slots of the stator highlighting the start and finish of each phasegroup The other drawing must show only the end connections of each phase group for a parallel connection of the phasegroups and a delta connection of the phases
Ex.5: A 10 MVA transformer operate at 25% overload, feeds 11 kV busbar through circuit breakers. The 11 Kv busbars through a circuit breaker. The busbars feed outgoing feeders through other circuit breakers, current transformers housed in the transformer and feeder circuit breakers have ratios 525/1 and 352/1 respectively and all sets of current transformer feed induction type over current relays having characteristic for a 100% setting
Since the first winding leakage impedance of a single-phase transformer with 220/110 V 50 Hz values is 0.25 + j0.9Ω, the second winding leakage impedance is 0.08 + j0.25 Ω and the load impedance is 3.3 + j2.8 Ω. Calculate the current and power factor and the secondary winding voltage.
If the load of wye connected transformer are: IA = 10 cis(-30ᴼ) IB = 12 cis (215ᴼ) IC = 15 cis (82ᴼ) What is the positive sequence component? The sequence component of phase a current are: Zero sequence current = 0.47 + j1.49 Positive sequence component = 18.4 cis (-31.6ᴼ) Negative sequence component = 3.23 cis (168.2ᴼ) Determine the phase b current.
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For the determination of one phase parameters of 20kVA 20000 / 480V, 60Hz transformerData were obtained by performing the following experiments.Blank running test: Vb: 480V Ib: 1.51A Pb: 271WShort circuit test: Vk: 1130V Ik: 1A Pk: 480Wa) Find the approximate equivalent circuit parameters with respect to the primary.b) When connected to the transformer to a load with a power factor of 0.8, it draws 42A at 480V. ItCalculate the yield in the conditions.
the results of an open circuit and a short circuit test at rated frequency on a 500kVA, 42kV/2.4 kV, 60Hz single-phase transformer, with the following results: open circuit test, on the low voltage side Voc=2400V, Ioc= 18.1A, Poc=3785w. circuit test, on the low voltage side Vsc=1910 V, Isc=11.9A, Psc=3850 W. a) find the approximate equivalent circuit referred to the low voltage with the magnetizing branch independent of the short-circuit impedance b) Find the single-phase equivalent circuit in per unit referred to the high voltage side