A 60 Hz synchronous generator having inertia constant H = 6 MJ/MVA and a direct axis transient reactance X = 0.3 per unit is connected to an infinite bus through a purely reactive circuit. Reactances marked on the diagram on common system base. The generator is delivering real power Pe = 0.9 per unit and Q = 0.075 per unit to the infinite bus at a voltage of V = 1.0 per unit. Determine critical clearing angle and critical clearing time when three phase fault occurs at the sending end of line using equal area criterion.

A 60 Hz synchronous generator having inertia constant H = 6 MJ/MVA and a direct axis transient reactance X = 0.3 per unit is connected to an infinite bus through a purely reactive circuit. Reactances marked on the diagram on common system base. The generator is delivering real power Pe = 0.9 per unit and Q = 0.075 per unit to the infinite bus at a voltage of V = 1.0 per unit. Determine critical clearing angle and critical clearing time when three phase fault occurs at the sending end of line using equal area criterion.

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 3.38P: Consider a three-phase generator rated 300MVA,23kV, supplying a system load of 240 MA and 0.9 power...

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