GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
(OP)
Dear Colleagues,
We are planning to measure Generator torsional shaft vibrations due to the erection of a new steel mill in the vicinity of our power plant. Our concern is about the electrical arc furnace loads of the mill, which may produce disturbances, harmonics in the grid and initiate sub synchronous resonance resulting generator torsional vibrations in our Generators. Can you share your experiences on these measurements please? Lot of literature is available on internet but not able to understand the real concept.
We are planning to measure Generator torsional shaft vibrations due to the erection of a new steel mill in the vicinity of our power plant. Our concern is about the electrical arc furnace loads of the mill, which may produce disturbances, harmonics in the grid and initiate sub synchronous resonance resulting generator torsional vibrations in our Generators. Can you share your experiences on these measurements please? Lot of literature is available on internet but not able to understand the real concept.






RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
It is an interesting question. I am waiting to see if there are any replies.
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
Just because it is physically in the vicinity doesn't mean it is electrically close to your plant.
The transmission or distribution authority which allowed the steel mill to connect will have stipulated the requirements in terms of harmonics and any measures required to limit the detriment caused to other customers at the point of common coupling. It's likely that any disturbances generated by the steel mill would cause significant power quality issues long before they would create any secondary mechanical effects. If you do find cracking due to torsional vibration it would be quite a leap to point the finger of blame at the steel mill.
Regards
Marmite
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
the yahoo group GETURBGEN and
the IGTC forum (Generator specific group)
http://www.generatortechnicalforum.org
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
http://www.epri.com/abstracts/Pages/ProductAbstrac...
RE: GENERATOR SHAFT TORSIONAL VIBRATIOIN MEASUREMENTS DUE TO STEEL MILL ARC FURNACE LOADS
"sub synchronous resonance resulting generator torsional vibrations" is an old topic can be tracked back to 1970s when the famous Mohave plant lost their generator due to the sub-synchronous resonance caused by 90% compensation(I recall).
I did this type of study 15 years ago in my country and it was a fairly complicated study requiring detailed generator data, turbine data both electrical and mechanical ones (such as inertia of each section of the shaft from High pressure cylinder all the way to the exciter. I recall we defined a complete shaft to more than 100 sections and therefore got more than 100 frequencies.) and system data. The whole study took exact a year including electrical mechanical study and EMTP study.
The measurement you referred we called at that time was “TSR“ (Torsional stress I forgot what R stands) is to monitor the mechanical vibration of the shaft and it is one of the means at that time to try to solve the Torsional stress issue. But later on it turned to a failed theory and proved that this means does not work. My personal suggestion is to stay away from the installation of monitor idea.
Based on my limited experience the steel mill adjacent to you plant (here I assume that the steel mill is electrically interconnected to your plant.) must have some kind of power electronic equipment such as Thyristor controlled converter/inverters interconnected to the grid with your plant.
So for such SSR issues not too many people have such expertise to perform the analysis and come up with proper solutions. I would suggest that you should find out a good consultant.