Question

In: Electrical Engineering

NB: may you please explain the phasor diagram used to get the reactance. draw phasor gor...

NB: may you please explain the phasor diagram used to get the reactance. draw phasor gor both scenario. That will be highly appreciated.

5. A given 3-MVA, 50-Hz, 11-kV, 3φ, Y-connected alternator when supplying 100 A at zero p.f. leading has a line-to-line voltage of 12,370 V; when the load is removed, the terminal voltage falls down to 11,000 V. Predict the regulation of the alternator when supplying full-load at 0.8 p.f. lagging. Assume an effective resistance of 0.4 Ω per phase. [13.5%]

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Expert Solution

Ans)

Given line voltages

phase voltages are

Given load current is

phasor diagram for this load is

from the phasor diagram above using inner triangle

is the reactance of the generator

=======

Now for full load 0.8 pf lagging

full load current is

regulation at this current is

this answer is calculated using matlab hence it is accurate ,if you use hand calculator neglecting some decimals you will get 13.5 % as given in answer

Phasor diagram at this load is

Manojponduru answered 4 months ago

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