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It would most likely depend on the relative capability of the wind turbine and the diesel generator. If the wind turbine is 1.5 MW and the diesel generator is 800 kW, then I would say the diesel should be in Droop. If the wind turbine is 800 Kw (and operating at 15% below 800 kW) and the diesel...

>Sorry, there is a correction. It's not CSVG. >CAVG is the o/p current from each packs. The original poster said the unit used a Mark VI turbine control system. Mark VI turbine control system do no use I/O Packs--Mark <b>VIe</b> turbine control system use I/O Packs. Mark VI would use VSVO...

Thank you for the feedback! I'm glad you were able to find a post about servo polarity checking and perform the checks--and rectify the problem.

Ahto, Thank YOU very much for the feedback! "Feedback is the most important contribution!"(c) here at control.com. It helps others who read these posts--now and in the future--know how problems were solved (or not) and if information provided was helpful (or not). Glad to hear the problem...

Aptx4869, I don't usually recommend other websites, but if you own, operate or maintain a GE-design F-class heavy duty gas turbine you can apply to join the F-class Users Group, where they have many forums about various aspects of F-class turbines and a lot of people share a lot of...

Curt, EXCELLENT reminders--all! Shield grounding is important--but effective shield grounding is even MORE important. And, static gremlins abound in dry environs. I've seen huge work stoppages result from static discharge in winter months--people claiming that electrical equipment hadn't...

Not every problem or failure is exactly the same as every other problem or failure--even of the same type of device (in this case a valve positioner). Keep an open mind when troubleshooting, because a closed mind can cause a lot of wasted time. Re-examine all your data, and how it was...

Ahto, I'm missing something, because the power factor can't be 1.0 and the VArs be -10 to +20; that just doesn't compute. And, you said this has been happening since commissioning--which usually means since the unit was initially installed and started-up and turned over to the Customer...

gtengineer, If a failure of any component results in a turbine trip that qualifies as a serious failure in my estimation and experience. Have you tried shutting off the compressed air supply as soon as it's noticed the valve starts drifting open? When you say CSRIHOUT isn't increasing...

Kashifali, If the Mark VIe doesn't have a TREA card, then you can ignore the signals and code for a TREA. If the unit doesn't have a mechanical overspeed bolt, then you can ignore the signals associated with the mechanical overspeed bolt. The "control speed signal" description refers to...

Salutations, How is the "AVR" being operated? Is it being operated in Automatic mode, or Manual mode? Or is there some kind of VAr or Power Factor control which is switched on when this problem is occurring? What is the grid voltage when the diesel generator is first synchronized to the...

Hi, gtengineer, Thinking this through, the Mark* (V? VI? VIe?) has a 4-20 mA output to a pneumatic control valve--an I/P positioner, which converts 4-20 mA of current from the Mark* (the "I" in I/P) to a 3-15 psi pressure (the "P" in I/P) to move the valve. The "loop" is closed in the I/P...

>If it quite common, why the vibration in the during start >up only after that disappear? I need mechanical reason. Could be oil whip. Could be critical. Not enough data. (The MOST likely cause.) By the way--this is control.com, not mechanical.com.

I have seen such a button on units, but it had a LOT of sequencing to prevent it's operation except under certain conditions (L4 had to be dropped out; the unit had to be at zero speed; there was a permissive that indicated a low pressure between the aux step valve and the SRV, etc.) The CPB...

The Data List 20 had a hidden set of screens for enabling or disabling some options and things like that. It&#8217;s been decades since I&#8217;ve looked at the MA screens, but if it is possible to add any points to the Trip History it would probably be done through the MA display function...

Do you have the MA password (MA=Manufacturing Associate)?

kashifali, Frame 9E GE-design heavy duty gas turbines don't usually use TREA terminal boards, which are designed and primarily used for aeroderivative gas turbines. In general, TREG cards are used for heavy duty gas turbines. (Having said that, GE Belfort has been given responsibility for...

>Please provide the brief idea of using two MPU Speed probe >in 505 woodward controller. Redundancy.

To my knowledge, it's not possible to purchase a time-limited license for ToolboxST. Since it uses a dongle for verification it doesn't seem possible to time-limited the dongle. But GE is doing lots of things they've never done before, and it takes a while for them to be known by even GE...

engr 14, It does seem high, but all inlet filters are NOT created equal(ly). Some can withstand a higher differential, while others can not. It all depends on the type of filter, the type of airborne contaminants (including humidity, and hydrocarbon vapours, if any), and the construction of...