UNBALANCE LOAD, REVERSE POWER IN SYNCHRONIZATION

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I concur--this should be a completely separate thread as it really has little or nothing to do with the original post. And bhilal.bhatti should explain his TLA (Three-Letter Acronym).

That being said, I have seen this once. The shear strength of the coupling bolts was calculated incorrectly--or that's what the steam turbine-generator set packager said (actually, it wasn't probably calculated at all--the packager bought a steam turbine from one manufacturer, a generator from another manufacturer and a coupling from a third supplier). The coupling manufacturer said the bolts are designed to shear primarily based on torque-based calculations (but also includes other electrical phenomenon, PhilCorso) to protect the turbine and the generator from serious damage in the event of pole slippage or similar occurrence. The bolts that were supplied weren't the right bolts for that particular application. (The coupling bolts kept shearing when lightning strikes in the area caused utility breakers to open in an incorrect order and greatly increase the load on the steam turbine-generator at one small biomass plant.) The local utility had to get involved to develop a different breaker tripping scheme than the one which was put in place when the biomass was being built and tied to the utility because the load "throw-on" was definitely going to break even the proper coupling bolts. This problem took over a year-and-a-half to sort out. The PLC being used to control the steam turbine had been improperly programmed and was annunciating a misleading alarm from the AVR. Four sets of coupling bolts were sheared before involving the coupling manufacturer and the STG supplier to solve the problem and obtain the proper bolts for the application and getting the utility to review and revise their protection scheme in the event of a fault or lightning strike near the plant.
Thank you very much for the quick response. Will revert soon after collecting necessary data and other information's as desired.
Regards
 
Most of the time 26 MW and 16 MW running parallel and shear pins broken. Last time when this happened the load on 26MW was 13.51 MW and 08 MW on 16 MW turbine.

Yes, this happened during synchronizing mode. When both the turbines were in normal operation, in view of this problem we have decided to operate one another 12 MW standby NG turbine in parallel. Now three turbines i.e., 26, 16 and 12 MW are in operation in synchronizing mode in the past five weeks and yet operation is satisfactory, and no pins broken of course after addition of another turbine the entire load shared.

Attached please find all the desired informations, if you still need any information please ask. We have all the steam turbines and Intel steam pressure is 65 Bar.
Regards
 

Attachments

Most of the time 26 MW and 16 MW running parallel and shear pins broken. Last time when this happened the load on 26MW was 13.51 MW and 08 MW on 16 MW turbine.

Yes, this happened during synchronizing mode. When both the turbines were in normal operation, in view of this problem we have decided to operate one another 12 MW standby NG turbine in parallel. Now three turbines i.e., 26, 16 and 12 MW are in operation in synchronizing mode in the past five weeks and yet operation is satisfactory, and no pins broken of course after addition of another turbine the entire load shared.

Attached please find all the desired informations, if you still need any information please ask. We have all the steam turbines and Intel steam pressure is 65 Bar.
Regards
This will not be enough to provide support from here

Again open another thread ....it would be better
 
Bilal.bhatti
...

Do you have monitored data over a period of time, similar to those provided by the originator of this topic, JSMHarish. I mean like kW, V, A, Pf, and component vibration, as well as Engine data like RPM and fuel consumption-rate! Finally service, Marine or Land-based?
Regards, Phil Corso
 
PhilCorso,

The engines are actually steam turbines. The photos in bilal.bhatti’s most recent post appear to be of a stationary, land-based installation.

Hope this helps.
 
Bilal.Bhatti...
WTF has pointed out why you should have started a New Forum. In this case one must go thru unrelated pages before addressing your problem.
Leads to error, especially at my age! Thanks WTF,
Regards, Phil Corso
 
Please find desired information's regarding following information's regarding 26 MW land-based steam turbine.
1. Trend at the time of last pins broken including loads, power factor and frequency at that time.
2. Vibration trends.
Any other information you need please ask.
Regards
Thanks.
 
PhilCorso,

The engines are actually steam turbines. The photos in bilal.bhatti’s most recent post appear to be of a stationary, land-based installation.

Hope this helps.

Please find desired information's regarding following information's regarding 26 MW land-based steam turbine.
1. Trend at the time of last pins broken including loads, power factor and frequency at that time.
2. Vibration trends.
Any other information you need please ask.
Regards
Thanks.
 
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