The shown distribution network is to supply two factories A & B with load curves indicated. Assume that both factories have a lagging power factor of 0.8 . Select the required sizes of transformers for both factories such that in the case of a failure in one transformer the overload on the remaining ones should not exceed 15% . ) Select the required sizes of fuses to be installed at both sides of transformers. :) Calculate the annual energy losses in transformers of factory A. Assuming that transformers are in operation continuously . 1) Select the required size of the 11KV. XLPE cables for the distribution network , if cables are to be laid direct in ground with maximum ground temperature of 30º C. e) Calculate the annual energy losses in cables of section SA S 2 Km A 3 Km 11/0.4 KV Trans. 11/0.4 KV Trans. Factory A PF = 0.8 lag. Factory B PF = 0.8 lag. |S (KVA) 500 S (KVA) 500 400 400 300 300 200 200 100 100 Time (hr) 24 Time (hr) 24 12 18 12 18 Load curve of Factory (A) Load curve of Factory (B)

The shown distribution network is to supply two factories A & B with load curves indicated. Assume that both factories have a lagging power factor of 0.8 . Select the required sizes of transformers for both factories such that in the case of a failure in one transformer the overload on the remaining ones should not exceed 15% . ) Select the required sizes of fuses to be installed at both sides of transformers. :) Calculate the annual energy losses in transformers of factory A. Assuming that transformers are in operation continuously . 1) Select the required size of the 11KV. XLPE cables for the distribution network , if cables are to be laid direct in ground with maximum ground temperature of 30º C. e) Calculate the annual energy losses in cables of section SA S 2 Km A 3 Km 11/0.4 KV Trans. 11/0.4 KV Trans. Factory A PF = 0.8 lag. Factory B PF = 0.8 lag. |S (KVA) 500 S (KVA) 500 400 400 300 300 200 200 100 100 Time (hr) 24 Time (hr) 24 12 18 12 18 Load curve of Factory (A) Load curve of Factory (B)

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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Two transformers A and B are connected in parallel to a load of (2+j1.5) ohms. Their impedances in secondary terms are ZA= (0.15+j0.5) ohm and ZB = (0.1+j0.6) ohm. Their no-load terminal voltages are Ex=207 volt and EB-205 volt. Find the power output and power factor of each transformer.
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Q1: During the separation of transformer core losses experiment: 1. Why should always keep the ratio of V/F constant? 2. If the transformer is operated at rated frequency but at voltage lower than rated value, how do you expect the following quantities to change? And why? i. Hysteresis loss ii. Eddy current loss iii. No-load current rotod
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A 11000/230 V, 150-kVA, 1-phase, 50-Hz transformer has core loss of 1.4 kWand full load copper loss of 1.6 kW. Determine (a) the kVA load for max. efficiency and(b) the value of max. efficiency at unity power factor
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