Page 782 - Basic Electrical Engineering
P. 782
X = 3.5 Ω, cosϕ = 0.8 lagging, sinϕ = 0.6
s
Total MVA = 3
Total VA = 3 × 10 6
This VA is for the three phases. VA per phase will be one-third of the total
VA
VA per phase = 1 × 10 6
Current per phase
Induced EMF,
Percentage regulation
Example 10.6 A 1500 kVA, 3300V, 50Hz, three-phase, star-connected
synchronous generator has an armature resistance of 0.2 Ω per phase. A field
current of 50 A produces a short-circuit current of 262 A and an open-circuit
EMF of 1200 V between the lines. Calculate voltage regulation of the
generator on full load at 0.8 power factor lagging and at 0.8 power factor
leading.
Solution:
Total kVA = 1500
