Very experienced Siemens personnel has performed extensive checks, yet the cause of the fault is not clear and the fault only occurs in case of steam turbine operation.
We will need to confer with the manufacturer vibrometer on Monday, Oct. 13, 2014.
Nevertheless, there is no reason to interrupt EGAT’s commercial operation with Train 22, in case the unit is dispatched.
As already said, we suggest to simulate the signals 22MAD13CY021/22/23/24 XV20, so that the double channel fault will not trip the ST. (The time delay becomes irrelevant in such cases.)