A two-pole Y-connected synchronous generator has a voltage level of 2300 V, a capacity of 1000 kVA, a power factor of 0.8 lagging, a frequency of 50 Hz, a synchronous reactance of 1.1 Ω and an armature resistance of 0.15 Ω. At a frequency of 50 Hz, there are friction and windage losses of 24 kW, and core losses of 18 kW. The field circuit has a dc voltage of 200 V and a maximum Ifof 10 A. The resistance of the field circuit is adjusted over the range of 20 - 200 Ω. The open circuit characteristic curve (OCC) of the generator is shown in Figure below. (a) What field current is required for the value of VT to be 2300 V when the generator is operating at no load? (b) What is the internal voltage generated by the engine at the specified rated conditions (generator rating)? (c) What field current is required for the VT value to be 2300 V when the generator is operating under the rated (rating) condition? (d) How much power and torque can be supplied by the prime mover of the generator (under rated conditions)?
A two-pole Y-connected synchronous generator has a voltage level of 2300 V, a capacity of 1000 kVA, a power factor of 0.8 lagging, a frequency of 50 Hz, a synchronous reactance of 1.1 Ω and an armature resistance of 0.15 Ω. At a frequency of 50 Hz, there are friction and windage losses of 24 kW, and core losses of 18 kW. The field circuit has a dc voltage of 200 V and a maximum Ifof 10 A. The resistance of the field circuit is adjusted over the range of 20 - 200 Ω. The open circuit characteristic curve (OCC) of the generator is shown in Figure below. (a) What field current is required for the value of VT to be 2300 V when the generator is operating at no load? (b) What is the internal voltage generated by the engine at the specified rated conditions (generator rating)? (c) What field current is required for the VT value to be 2300 V when the generator is operating under the rated (rating) condition? (d) How much power and torque can be supplied by the prime mover of the generator (under rated conditions)?
Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A two-pole Y-connected synchronous generator has a voltage level of 2300 V, a capacity of 1000 kVA, a power factor of 0.8 lagging, a frequency of 50 Hz, a synchronous reactance of 1.1 Ω and an armature resistance of 0.15 Ω. At a frequency of 50 Hz, there are friction and windage losses of 24 kW, and core losses of 18 kW. The field circuit has a dc voltage of 200 V and a maximum Ifof 10 A. The resistance of the field circuit is adjusted over the range of 20 - 200 Ω. The open circuit characteristic curve (OCC) of the generator is shown in Figure below.
(a) What field current is required for the value of VT to be 2300 V when the generator is operating at no load?
(b) What is the internal voltage generated by the engine at the specified rated conditions (generator rating)?
(c) What field current is required for the VT value to be 2300 V when the generator is operating under the rated (rating) condition?
(d) How much power and torque can be supplied by the prime mover of the generator (under rated conditions)?
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