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Tutorial_1_Power Distributors

# Tutorial_1_Power Distributors - Fig 1.2 3 The load on a d.c...

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EEE3057S Tutorial 1 - Power Distribution Systems 4 August 2010 Power Distribution Systems 1. Five lines, A, B, C, D, and E run to a common point O. Find the potential of O and the current leaving each supply point assuming that no current is tapped from point O. Resistances of various sections and potentials of feeding points are shown in Fig. 1.1. [5 Marks] Fig.1.1 2. An electric train taking a constant current of 500 amps moves on a section of line between two substations 7km apart and maintained at 475 and 490 volts respectively. The track resistance is 0.035 Ohm per km, both go and return. Find the point of minimum potential along the track and currents supplied by two substations at that instant. [7 Marks]

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Unformatted text preview: Fig. 1.2 3. The load on a d.c. 3-wire system employing a rotary balance set with 420 V between outers consists of lighting loads of 200 A on the +ve side and 317 A on the – ve side. Power loads taking 420 A are connected across outers. Calculate the load in kW on the main generators and on each of the balancer machines. Assume a loss of 2 kW in each balancer machine. Fig. 1.3 4. Fig 1 shows a 3-phase system supplied at 11kV at A. The load currents are balanced and the p.f.’s (all lagging) are with respect to supply voltage at A. The impedances shown are per phase values. Calculate the currents in various sections and the voltage at load point C. Fig. 1.4...
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Tutorial_1_Power Distributors - Fig 1.2 3 The load on a d.c...

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