4. An Open-Wye/Open-Delta transformer, as shown in Figure, is formed by two identicalsingle-phase transformers. The primary line-to-line voltage is 12.47 kV, and thesecondary line-to-line voltage is 208 V. Take

Step 1:- Part (a) Assume the 3-phase load is delta connected. Observe that between phase b and c an…

Answered: 4. An Open-Wye/Open-Delta transformer,…

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 1:14 and a no-load primary voltage of 17 (line-to-line) kV. The step- down transformer has a turn ratio of 18:1 and it has a Y-connected, balanced load of 0.463 +j 0.0772 ohms connected to its secondary side. A capacitor bank of -j0.324 ohms is added parallel to the load. Assuming an ideal transmission line, the effective impedance (per phase) of the system seen by the source would be: O A. 0.292 + j0.375 O B. None of the other choices are correct O C. 0.584 + j0.750 O D.0.196 + j0.158 O E. 5.84 + j7.5
3. A non-ideal 1-phase transformer has turns ratio 5:1 with 120Vac primary. The primary impedance is 1 + j1 Ohms, and the secondary impedance is 0.2 + j0.2 Ohms. Assume the core impedance (R0 and X0) can be neglected. A resistive load of 12 Ohms is connected to the secondary. What is the primary current magnitude? What is the secondary voltage magnitude? What is the efficiency of this transformer with this load?
What do the connection angles and groups show in transformers? For example, where are the Yy0 , Dy5 ,Yd5, Yz5 group transformers used?
Ql-phase step down transformer 1250 KVA, 10002200 V, 50 Hz The resistance /phase and leakage reactanceiphase of the primary winding are 0.78 2 and 4.82 and the corresponding values for the secondary winding are 0.012 and 0.002 respectively if the primary winding is connected in delta and secondary in star calculate: )The voltage to be applied at normal frequency to the primary to circulate full-load through it when the secondary is short-circuited li) The full load copper loss
2. Given three identical ideal single-phase transformers with each rated at 100KVA and 7kV/3.5kV, they are connected as a three-phase transformer bank. The three-phase transformer has high voltage side connected in delta and the low voltage side is connected in wye. A three-phase 200KVA, wye connected load is connected at the low voltage side of the transformer. Calculate the following: a. Rated line-to-line voltage on each side b. Line current on each side of the transformer
a single-phase transformer serves a 7.2kw resistive loadlocated 200 ft from the transformer. each conductor from the transformer to load has an impedence of (0.78+j0.052) ohms per 1000ft. if the voltage at the load terminal is 240v, the magnitude of the voltage (v) at the transformer secondary is most nearly:

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4. An Open-Wye/Open-Delta transformer, as shown in Figure, is formed by two identical single-phase transformers. The primary line-to-line voltage is 12.47 kV, and the secondary line-to-line voltage is 208 V. Take