generator sync problem

[un421ate1]

Synchronised a 700 Kwatt steam turbine driven generator, (480v) to the utility with peculiar results...the voltage went to 510 volt the PF to about 0.2 the current to 900 amp with little indication of real power on the wattmeter before tripping on overcurrent. The excitation is provided through a Basler power factor controller and voltage regulator arrangement.
Any explanations on reason for above truly appreciated.

 

[rbulsara]

sounds like bad exciter/ AVR.
Powr factor controller is a static exciter ? I know excitation affects the power factor, but is this a real exciter?

Has this unit independelty run suscessfully on load?

 

[dpc]

Check the polarity of the CT used by the voltage regulator for PF control. It sounds as though you have something mis-wired going the VR.

 

[edison123]

un421ate1,

An ac machine, immediately upon synchroniztion with grid, will either take current from the grid (reverse power) or supply megavars with a low pf. Immediately upon synchroniation, your governor should control your unit to supply rapidly a minimum power of 10 to 20% to the grid.

 

[Shortstub]

New or older installation?

 

[un421ate1]

thanks for suggestions, generator currently on line synched to utility, acting normally..In island mode Basler power factor controller redundant, excitation provided by AVR, I guess the question I'm asking is would the symptons described be caused by under-excitation or over-excitation.
My boss doesn't like me experimenting.

 

[jbartos]

Suggestion to the previous posting: It might be either of those two, under-excitation or over-excitation. Was PF=.2 lagging or leading?