Critical Clearing Angle example P. 0.8 p.u. q- 0.074 p.u. connected to infinite bus of 1.0 p.u. A Three phase fault on any of the transmission feeder lines; Determine the critical clearing angle. What is the critical clearing angle - The critical clearing angle is the angle through which a generator rotor must be displaced from its equilibrium position following a disturbance (such as a fault) to just maintain stability in a power system. In other words, it is the maximum angle by which the rotor of a synchronous machine can be swung following a disturbance and still allow the system to reach a stable post-fault condition. Xt = 0.2 E' OBE X=0.3 1 V₁=1.1 XL1=0.3 XL2=0.3 The current flowing into the infinite bus is S* V* 1== 0.8-j0.074 1.020° = 0.8-j0.074p.. B The transfer reactance between internal voltage and the infinite bus before fault is: 2 V 1.020 8

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Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.