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Category > Applied Sciences Posted 05 May 2017 My Price 7.00

A 25-MVA, 12.2-kV,

A 25-MVA, 12.2-kV, 0.9-PF-lagging, three-phase, two-pole, Y-connected, 60-Hz synchronous generator was tested by the open-circuit test, and its air-gap voltage was extrapolated with the following results:

The armature resistance is 0.6 W per phase.

(a) Find the unsaturated synchronous reactance of this generator in ohms per phase and in per-unit.

(b) Find the approximate saturated synchronous reactance XS at a field current of 380 A. Express the answer both in ohms per phase and in per-unit.

(c) Find the approximate saturated synchronous reactance at a field current of 475 A. Express the answer both in ohms per phase and in per-unit.

(d) Find the short-circuit ratio for this generator.

(e) What is the internal generated voltage of this generator at rated conditions?

(f) What field current is required to achieve rated voltage at rated load?

 

Answers

IT KING
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Status NEW Posted 05 May 2017 11:05 AM My Price 7.00

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