Q4: A 100-kVA, 6600/250-V, 50-Hz transformer gave the following results : O.C. test : 900 W, normal voltage. S.C. test (data on h.v. side) : 12 A, 290 V, 860 W Calculate (a) the efficiency and percentage regulation at full-load at 0.8 p.f. lagging. (b) the load at which maximum efficiency occurs and the value of this efficiency at p.f. of unity, 0.8 lag and 0.8 lead.

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.11P: For the transformer in Problem 3.10. The open-circuit test with 11.5 kV applied results in a power...
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Q4: A 100-kVA, 6600/250-V, 50-Hz transformer gave the following results : O.C. test :
900 W, normal voltage. S.C. test (data on h.v. side) : 12 A, 290 V, 860 W Calculate (a) the
efficiency and percentage regulation at full-load at 0.8 p.f. lagging. (b) the load at which
maximum efficiency occurs and the value of this efficiency at p.f. of unity, 0.8 lag and 0.8
lead.
Transcribed Image Text:Q4: A 100-kVA, 6600/250-V, 50-Hz transformer gave the following results : O.C. test : 900 W, normal voltage. S.C. test (data on h.v. side) : 12 A, 290 V, 860 W Calculate (a) the efficiency and percentage regulation at full-load at 0.8 p.f. lagging. (b) the load at which maximum efficiency occurs and the value of this efficiency at p.f. of unity, 0.8 lag and 0.8 lead.
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