A 3-phase 11kV star connected alternator has armature resistance of 1 ohms/phase and a synchronous reactance...

Transcribed Image Text:

A 3-phase 11kV star connected alternator has armature resistance of 1 ohms/phase and a synchronous reactance of 20 ohms/phase. Calculate the regulation for a load of 1500kW at P.F of (1) 0.8 lagging (ii) unity (iii) 0.8 leading. Draw a sketch of synchronous generator and name the main parts of it and describe the working principal of synchronous generator. Explain the function of excitation system of a power plant. Calculate the speed at which 6-pole alternator should be driven to generate 50 cycles per second. A 3-phase 11kV star connected alternator is rated at 1500kVA, 11kV. The resistance and reactance per phase are 1.5 ohms and 30 ohms respectively. To what value will the terminal voltage rise when full-load at P.F. 0.8 lagging is switched off? (a) What are the main parameters that should be considered when selecting a generator? (b) Explain the function of governor of a power plant. Explain the function of excitation system of a power plant. A 3-phase 11kV star connected alternator has armature resistance of 1 ohms/phase and a synchronous reactance of 20 ohms/phase. Calculate the regulation for a load of 1500kW at P.F of (1) 0.8 lagging (ii) unity (iii) 0.8 leading. Draw a sketch of synchronous generator and name the main parts of it and describe the working principal of synchronous generator. Explain the function of excitation system of a power plant. Calculate the speed at which 6-pole alternator should be driven to generate 50 cycles per second. A 3-phase 11kV star connected alternator is rated at 1500kVA, 11kV. The resistance and reactance per phase are 1.5 ohms and 30 ohms respectively. To what value will the terminal voltage rise when full-load at P.F. 0.8 lagging is switched off? (a) What are the main parameters that should be considered when selecting a generator? (b) Explain the function of governor of a power plant. Explain the function of excitation system of a power plant.

Answer rating: 100% (QA)

Generator Calculations and Sketch Regulation Calculations i 08 lagging Calculate line current I P 3 V cos 1500 3 11000 08 8658 A Calculate impedance per phase Z R jX 1 j20 200928659 ohms Calculate vol... View the full answer