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Question #5 (a) Name 3 causes of over-voltages in power systems and name 3 methods of protection normally used. (b) Name the main cause of over-currents in power systems and list 2 methods of protection normally used in power systems (c) A single phase ring distribution fecder is shown in Fig. 2. It is supplied at point A/D from 240 V source. Calculate (i) (ii) (iii) The net current and power supplied at D/A from the source. The current distribution in all sections of this ring feeder Voltages at points B and C. 0.12 +j0.045 0 50 A p.f.=1 50 A B 0.8 p.f (Lagging). D 0.12 +j0.045 0 50 A 0.9 p.f (Leading). (Fig.2) 0.04 +j0.015 O

Question #5 (a) Name 3 causes of over-voltages in power systems and name 3 methods of protection normally used. (b) Name the main cause of over-currents in power systems and list 2 methods of protection normally used in power systems (c) A single phase ring distribution fecder is shown in Fig. 2. It is supplied at point A/D from 240 V source. Calculate (i) (ii) (iii) The net current and power supplied at D/A from the source. The current distribution in all sections of this ring feeder Voltages at points B and C. 0.12 +j0.045 0 50 A p.f.=1 50 A B 0.8 p.f (Lagging). D 0.12 +j0.045 0 50 A 0.9 p.f (Leading). (Fig.2) 0.04 +j0.015 O

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Question #5 (a) Name 3 causes of over-voltages in power systems and name 3 methods of protection normally used. (b) Name the main cause of over-currents in power systems and list 2 methods of protection normally used in power systems (c) A single phase ring distribution fecder is shown in Fig. 2. It is supplied at point A/D from 240 V source. Calculate (i) (ii) (iii) The net current and power supplied at D/A from the source. The current distribution in all sections of this ring feeder Voltages at points B and C. 0.12 +j0.045 0 50 A pf.=1 50 A B 0.8 p.f (Lagging). D 0.04 +j0.015 O 0.12 +j0.045 0 50 A 0.9 p.f (Leading). (Fig.2)
Transcribed Image Text:Question #5 (a) Name 3 causes of over-voltages in power systems and name 3 methods of protection normally used. (b) Name the main cause of over-currents in power systems and list 2 methods of protection normally used in power systems (c) A single phase ring distribution fecder is shown in Fig. 2. It is supplied at point A/D from 240 V source. Calculate (i) (ii) (iii) The net current and power supplied at D/A from the source. The current distribution in all sections of this ring feeder Voltages at points B and C. 0.12 +j0.045 0 50 A pf.=1 50 A B 0.8 p.f (Lagging). D 0.04 +j0.015 O 0.12 +j0.045 0 50 A 0.9 p.f (Leading). (Fig.2)
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