Generator LCI

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surbalaji Active Contributor Join Date: Sep 2010 Location: Tamil Nadu, India Posts: 24	Generator LCI 04/14/2011 12:23 AM
	Ours is a 9FA gas turbine, in which for initial cranking we are converting the generator into synchronous motor with the help of load commutated inverter. In generator mode, neutral will grounded with NGT & NGR via. disconnector 89ND. But during motoring mode we are opening the earth disconnector 89ND. what is the reason for that? during motoring & generator mode what will be direction of rotation? __________________ Life is for one generation, a good name is forever.
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#1 Re: Generator LCI... 04/14/2011 2:41 AM
	Do you earth the star point of a normal motor? Running as a motor no earth is required. Direction has to be the same as generation. __________________ The reports of my death are greatly exaggerated.
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surbalaji Active Contributor Join Date: Sep 2010 Location: Tamil Nadu, India Posts: 24	#2 In reply to #1 Re: Generator LCI... 04/14/2011 4:35 AM
	In normal case, motor & generator rotation is different. But here how it is satisfied to rotate in same direction? __________________ Life is for one generation, a good name is forever.
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#3 In reply to #2 Re: Generator LCI... 04/14/2011 12:19 PM
	If you run the turbine and gen set up to speed in reverse and then try to start the turbine forward, what do you think the results will be? Or are you looking at the input / output of a gearbox? __________________ The reports of my death are greatly exaggerated.
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LAA_Lucke Guru Join Date: Feb 2010 Posts: 1013 Good Answers: 36	#4 In reply to #2 Re: Generator LCI... 04/15/2011 7:30 AM
	If it is run as amotor, the direction of rotation is selected by interchanging two phases. Once cranking is terminated, before exciting as generator, the phases are resynchronised etc before connecting to the grid. As Tony said, the grounding of the neutral is not desired in motor mode. It might signal a fault if properly protected in the motor mode.
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LAA_Lucke (1); surbalaji (1); TonyS (2)

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