A three-phase transmission line is feeding from a 400-MVA, 240/24 kV transformer atits sending end. The line has an impedance of 0.6 + jl.20 per phase while thetransformer has an equivalent impedance of 1.2 + jl.6 Q referred to the HV side. Ifthe base to be used is 100 MVA, 20 kV for the transmission line, find the per-unit valuesto be used for the transformer and line impedancesA single-phase transformer is rated 15 MVA, 66/11.5 kV. With the 11.5 kV windingshort-circuited, rated current flows when the applied voltage to the primary is 5.5 kv.The power input is read as 100 kW. Determine the per unit equivalent impedance ofthe transformer.

Answered: Image /qna-images/answer/71cf5f68-e2e3-41fa-9f4d-9d38aca11920.jpg

Answered: A three-phase transmission line is…

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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Similar questions

A load impedance of (200+j0) ohm is to be matched with a 50 ohm transmission line using a quarter wave transformer. What will be the value of the characteristic impedance of the quarter wave transformer.
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
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.
3) A three-phase transformer of 60 kVA (three-phase power), 13200/480 V (line A line) in delta-strella connection has a resistance of 0.02 PU and a reactance of 0.08 PU. For this transformer, calculate: a) The voltage regulation at full load and F.P. 0.85 in delay. (b) The regulation of voltage voltage to full cargo and F.P. Unitarian. c) The voltage regulation at full load and F.P. 0.85 in advance.
Two single-phase transformers, having equal turns ratio, in parallel supply a secondary load of 1,000 A at 0.8 pf lagging. For each transformer the secondary emf on open circuit is 3,300 V and their total leakage impedances referred to secondary are (0.10 + j0.20) ohms and (0.05 + j0.040) ohm, respectively. Determine the output current on each transformer.
The Y/Y connected 3-phase step-up transformer has a rating of 1200 MVA, operating at 33 kV/340 kV and 60 Hz. Its impedance is characterized solely by a reactance of 11.5 percent. Its purpose is to increase the voltage from a generating station in order to supply power to a 340 kV transmission line. Answer the following questions: a) Draw and determine the equivalent circuit of this transformer, per phase, in per-unit. b) Using the per-unit method, determine the generator terminal voltage when the high-voltage (HV) side of the transformer supplies 800 MVA at a power factor of 0.90 with a lagging angle, and the voltage is 360 kV. Hint: Select the nominal voltage as a base voltage, and the nominal power rating as a base power.
It is bartleybe's policy that if questions objective than you need to solve at least first 3 questions.

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