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Protection Riddle No.95 - Field excitation of Synchronous Generator
What will happen if Field excitation is provided at 1000 rpm to the generator having synchronous speed is 3000 rpm . Is there any protection provided to avoid this?
Author : rakesh kumar - From: India
 
#1
Sat, October 13th, 2012 - 14:36
Surely , it leads to overflux . Relay 24 ( Ansi code) has been anticipated for that . If it's connected with its own network ( Not a large and infinite network) , on the conrary , it leades to undervoltage (27) 
Author : Glavizh - From: Iran
 
#2
Wed, October 24th, 2012 - 15:42
Energization of a 3000 rpm, 2 pole generator with field applied at other rotor speed is in effect an out-of-phase synchronization. The severity of this event is dependent on the speed differential, the angular difference between the generator and system, and system stiffness. Shaft torsional excursions in excess of three times rated can occur as a result of a three-phase event. The torsional oscillation from such an event can persist for 30 sec with each individual torsional excursion adding to the total loss of fatigue life in the shaft. 
Author : Hamid - From: Iran
 
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