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Hi I advise you to have a look on these examples pof calculation with 50°F for Delta Tfi or with no Delta Tfi it is showed how to calculate Api for each operations mode on for a Frame 7E as mentionned in this document:

LL would be Limit low LH would be for Limit High

Wich facility it is ? plant ? It would be good to get the whole picture for the logic of this pump start permissive

Or at least signals name/Reference tag ....

A sample of the rung or appcode would be good start to support from here

Hi Any job/work done around this unit these last days Could it be possible for you to share parameters related to the unit during the mentionned operations When you say GT take load more than normal ...how much it is ?

Hey Thank you for the update ! All the best

Hello Thank you for sharing SLD When one GT IS TRIPPED then 52L TRIPPED/OPENED you should have GT 1 OR 2 OR both supplying UATs ...as you said that Step up Transformer is isolated from grid But when GTs one or two tripped then 52G should get tripped to depending on the trip cause... There...

Hey It would be good to get some trends from this unit with essentials datas like Current Active Reactive power..Power factor load nature

Hey Is that new unit installation/commissioning or unit already operated without Differential protection trip?

When this issue appeared? Any outage /inspection done these last days ? We cannot provide better support as we dont have the application code/control system software ... So if you ok to share programm of this STG ...we can be a better support

Best thing is to provide SLD so we can support

Hi You should look for Network architecture /topology document

The unit which tripped by 52L (Line circuit breaker ) or by 52G (Generator circuit breaker)? The tripped unit by 52L should feed Unit or sometimes Plant auxiliaries equipments

This should be part of the electrical /power systems studies analysises

Is that simple or combined cycle configuration In case of one unit tripped well it really depend on site configuration

Hello Is that an island mode operation mode ? I worked in Canary Island in Tenerife sur (Granadilla ) They got 2*frame 6FA GTG Also if possible can you attach here a single line diagram?

Any update on this thread.. Thx

Hi What about a single line diagram and event log alarm /trip reports to begin investigatation on what is happening at your site.

In the app code for Mark6e (Frame9FA) that i got , CA_CRT is called " Combustion Reference Index" Will look on the specified rungs for better understanding