We have two gas turbine (Frame-5, 25MW) at our plant TG-701 (ISO mode) and TG-702 (Droop Mode). From last four days when a particular motor 4451 (650KW) at our plant starts TG-702 pick 1.7MW (this load is different for each startup ranges from .5 to 2.4MW) load which is a reverse action. This motor starts 6 to 7 times daily but this behaviour of picking load of Droop mode gas turbine repeats seldom (once every day).

We have larger motors of 2MW and on their startup every thing is fine. This particular motor 4451 drives a compressor.

One more observation/history which might be helpful, is that TG-702 (Droop) has 16KG/cm pressure at upstream of SRV due to chocked strainer. while on TG-701 (ISO), it is 18kg/cm. Whenever there is a slight change of load on TG-702 (droop), its SRV opens fully due to low pressure its upstream but GCV seems to work fine. No trends are available.

1)Why Droop mode GT is picking load?

2)Why TG-701 response is sluggish and other is fast to pick load (Anything related to SRV low upstream pressure)?

3)Can a particular motor creat such problem?

Best Regard,
Adeel Imtiaz

 

> No trends are available.

<b>WHY NOT?</b>

> 1)Why Droop mode GT is picking load?
Impossible to say given the information provided. <b>What is happening to the frequency?

What is the load on the Isochronous unit when this alleged unusual behaviour is occurring?</b>

> 2)Why TG-701 response is sluggish and other is fast to pick load (Anything
> related to SRV low upstream pressure)?

If the information you provided is correct, then the gas fuel supply pressure is fine on the Isochronous unit so--unless it's already at Base Load--it should be responding normally. Why would think low supply pressure on the Droop unit would cause the Isochronous unit to respond slowly? (Enquiring minds would like to know.)

> 3)Can a particular motor creat such problem?

Great question for Phil Corso.

 

CSA... thanks for the potential "helpful" vote, but no thanks! You have the spot-light, so continue with your answer!

However, I would like to give you a word of advice... stop shouting so much!!!

Phil

 

> However, I would like to give you a word of advice... stop shouting so much!!!

Advice about shouting, punctuated with three (3) exclamation points no less.

Seriously?