We have a GE Frame 3 turbine on our site. When trying to start the emergency pump, a momentary voltage drop is detected in the control panel.
We use the GE Speedtronic Mark VIe as our control system. Currently, we're trying to start ELOP from the toolbox following a routine PM, as the machine is undergoing HGPI inspection. Although an imbalance voltage has been detected, it hasn't previously impacted the machine's startup.What is the control system used for this Unit
Are you tryin to start the ELOP in Manual or Auto from MCC rack or from Control system
Any alarm/trip annunciated during this operation?
Okay thank you for these clarifications
Thanks for your reply,
An alarm signaled the missing of 125 VDC, but the panel remained active during a brief voltage drop. The panel's voltage input returned to the initial value, and no modifications were made to the MCC rack. During a manual ELOP start and control panel shutdown was off, the voltage drop persisted. Further investigation revealed that voltage of each wire (input source) against the ground showing -49 and +86.
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by Bob Odhiambo