Q3) A 140-MVA, 13.2-kV three-phase generator, which has a positive-sequence reactance of1.5 per unit on the generator base, is connected to a 155-MVA, 13.2 A/115 Y-kV step-uptransformer with a series impedance of 0.005+j0.1 per unit on its own base.1. Calculate the per-unit generator reactance on the transformer base.2. The load at the transformer terminals is 25 MW at 0.8 power factor lagging and at115 kV. Draw the per unit circuit3. By considering the fact that the terminals of the high voltage side of Y-A are leadingthe terminals of the low voltage side by 30 degrees, determineThe transformer low-side voltageThe generator internal voltage behind its reactanceb. The generator output power (including its reactance).The generator power factor (including its reactance).a.a.c.

Part (1.) The MVA rating of the generator is 140 MVA. The voltage rating of the generator is 13.2…

Answered: Q3) A 140-MVA, 13.2-kV three-phase…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A short transmission line connects a step-up transformer on the source side with a series impedance of j0.5 ohms (referred to the primary) to a step-down transformer on the load side with a series impedance of 50 ohms (referred to the primary). The turn ratio of the step-up transformer is 1:10 and a no-load primary voltage of 13.2 (line-to-line) kv. The step-down transformer has a turn ratio of 15:1 and it has a Y-connected, balanced load of 0.667 +j 0.111 ohms connected to its secondary side. A capacitor bank of -j0.239 ohms is added parallel to the load. Assuming an ideal transmission line, the effective impedance of the system (per phase) seen by the source would be: O A. 0.093 + j0.249 O B. 0.372 + j0.996 OC.3.72 + j9.96 O D. None of the other choices are correct O E. 0.186 + j0.498
3.8. Three identical 9-MVA, 7.2-kV/4.16-kV, single-phase transformers are con- nected in wye on the high-voltage side and delta on the low voltage side. The equivalent series impedance of each transformer referred to the high-voltage side is 0.12 + j0.82 S per phase. The transformer supplies a balanced three- phase load of 18 MVA, 0.8 power factor lagging at 4.16 kV. Determine the line-to-line voltage at the high-voltage terminals of the transformer.
In a star-delta phase shifting transformer, the zero sequence currents cannot flow through the it True False
A 4-bus three-phase power system consists of the following equipment: • Generator 1 connected to bus 1 with a rated power of 20MVA, rated voltage of 20 kV, and a series reactance of 0.4 p.u. • Generator 2 connected to bus 5, with a rated power of 12MVA, rated voltage of 10 kV, and a series reactance of 0.3 p.u. Transformer 1 connected between buses 1 and 2, is wye-wye connected with a rated power of 20 MVA, rated voltages 20/100 kV, and a series reactance of 0.1 p.u. • Transformer 2 connected between buses 4 and 5, is wye-wye connected with a rated power of 12 MVA, rated voltages 12/110 kV, and a series reactance of 0.15 p.u. • Transmission Line 2-3 connects buses 2 and 3 and had a series impedance of 50 + j75 ohms. • Transmission Line 3-4 connects buses 3 and 4 and had a series impedance of 40 + j80 ohms. • Load A connected to bus 3 and abosorbes20 MW and 10 MVAR. The voltage at bus 3 is 105 kV. 1) Draw the one-line diagram for the system. 2) Draw the per-unit, per phase…
Here is a single phase transformer, 15 kVA, 15000/380 V, 50 Hz has Ze-0.02+j0.05 perunit, R. 50 perunit, and Xm =30 perunit, (per unit = actual value/base value), for scaling of the problem. (pu). A) Compute and draw the equivalent circuit components in Qs referred to the low-voltage side, B) Low voltage side is connected to a load of 4L 90° (lagging) and HV side is supplied by 15KV, compute voltage drop on the load V2 and voltage regulation VR.
The equivalent resistance and reactance referred to the secondary side of a 10 kVA, 2200/440 V, single phase transformer are 0.3 and 1.20 respectively. Then find the full load voltage regulation at (i) 0.8 lagging (ii) unity and (iii) 0.6 leading power factor.
A 3-phase generator has positive, negative, and zero-sequence reactance's of 0.30, 0.20, and 0.05 p.u. respectively. The generator is connected to a three-phase transformer Delta-Wye grounded with positive and negative sequence reactance of 0.10 p.u. and zero sequence reactance equal to 0.20 p.u. The transformer is connected to a transmission line having positive and negative sequence reactance of 10% and a zero-sequence reactance of 35%. The transmission line is connected to another Wye-Delta transformer and then to a three-phase load with each branch impedance being j1.0 and the neutral is grounded through a reactance of j1.0. A single line-to-line fault occurs at the end of the transmission line on phases B and C. a. Draw the sequence networks b. Compute the Sequence currents c. Compute the faulted phase currents
what is the definition of zero sequence impedance in a transformers? And what is the benefit of this check in transformers?
A single-phase transformer rated 2400 – 277 V, 50 kVA, 60 Hz is tested with the following results: Open-Circuit Test: 277V, 4.51 A, 735 W. Short-Circuit Test: 51.4V, 19.6 A, 368 W. Determine the followings; 20. The series equivalent impedance referred to the HV side (ohms). 21. The series equivalent impedance in per-unit. 22. The magnetizing branch impedances referred to the LV side (ohms). 23. The magnetizing branch impedance in per-unit. 24. The full-load efficiency (%) when operating a load drawing rated power at rated voltage and unity power factor. 25. The voltage regulation (%) when operating a load drawing rated power at rated voltage and unity power factor.

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