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Please, I need help on this problem. we are using GE frame VI, with speedtronics Mark Vi turbine controller. The problem with about two of the machine is that whenever it's on base load one of the exhaust thermocouples will be showing red, and one or two more will be showing yellow although, the effect did not TRIP the unit. during system outage, the affected thermocouples were changed. when the unit was later run up, we found out that the problem is still there.
Then for second, we use multimeter to test the D.C. resistance of the thermocouple. we got 6.1 ohms and 7.5 ohms for the ones that are showing yellow and red, while the other ones that are not showing give us value of 8.7 ohms, 8.5 ohms, 10.3 ohms etc., and the resistance of the new ones lie within the range 5.6 ohm to 8.1 ohm.
Please i need your assistance on next step to take to solve this problem.
Then for second, we use multimeter to test the D.C. resistance of the thermocouple. we got 6.1 ohms and 7.5 ohms for the ones that are showing yellow and red, while the other ones that are not showing give us value of 8.7 ohms, 8.5 ohms, 10.3 ohms etc., and the resistance of the new ones lie within the range 5.6 ohm to 8.1 ohm.
Please i need your assistance on next step to take to solve this problem.