S
We have 125 VDC ground fault on our GE Fr 7FA MK-VI GT. The +ve bus voltage came down to 14 VDC from a normal voltage of 62 VDC.
Efforts were made to check the integrity of field instruments and limit switches etc whichever can be done online, but found nothing. It may take couple of days to shutdown the machine for further offline checks. The query is whether is it ok to run the machine with this condition? Now the DC voltage is further found to be decreasing with time (1 V/ day approx). Till which voltage level of the DC bus, the machine can be in service?
Thanks in advance
SR Mak
Efforts were made to check the integrity of field instruments and limit switches etc whichever can be done online, but found nothing. It may take couple of days to shutdown the machine for further offline checks. The query is whether is it ok to run the machine with this condition? Now the DC voltage is further found to be decreasing with time (1 V/ day approx). Till which voltage level of the DC bus, the machine can be in service?
Thanks in advance
SR Mak