A 480 V, 50 Hz, Y-connected six-pole synchronous generator has a per-phase synchronous reactance of 1.0 2. hs full-load armature current is 60 A at 0.8 PF lagging. Its friction and windage losses are 1.5 kW and core losses are 1.0 kW at 60 Hz at full load. Assume that the armature resistance (and, therefore, the FR losses) can be ignored. The field current has been adjusted such that the no-load teminal voltage is 480 V. a. What is the speed of rotation of this generator? b. What is the terminal voltage of the generator if : i. it is loaded with the rated current at 0.8 PF lagging: ii. it is loaded with the rated current at 1.0 PF; iii. it is loaded with the rated current at 0.8 PF leading. c. What is the efficiency of this generator (ignoring the unknown electrical losses) when it is operating at the rated current and 0.8 PF lagging?
A 480 V, 50 Hz, Y-connected six-pole synchronous generator has a per-phase synchronous reactance of 1.0 2. hs full-load armature current is 60 A at 0.8 PF lagging. Its friction and windage losses are 1.5 kW and core losses are 1.0 kW at 60 Hz at full load. Assume that the armature resistance (and, therefore, the FR losses) can be ignored. The field current has been adjusted such that the no-load teminal voltage is 480 V. a. What is the speed of rotation of this generator? b. What is the terminal voltage of the generator if : i. it is loaded with the rated current at 0.8 PF lagging: ii. it is loaded with the rated current at 1.0 PF; iii. it is loaded with the rated current at 0.8 PF leading. c. What is the efficiency of this generator (ignoring the unknown electrical losses) when it is operating at the rated current and 0.8 PF lagging?
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
Chapter11: Transient Stability
Section: Chapter Questions
Problem 11.3P
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