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  1. MDEAus

    Callide Power Station

    byrdj I am not surprised this is mostly around the grid response as it is from the grid operator AEMO. The more indepth report to keep an eye out for will be CS energy's independent root cause analysis report if it is ever publicly available. It does however provide a bit more of a clear...
  2. MDEAus

    Callide Power Station

    Yes I believe these turbines have shaft driven oil pump and a back pump. I am not sure what it would take for both of those to be offline.
  3. MDEAus

    Callide Power Station

    The investigation is to be wide ranging, including human error. It is my understanding that there is uninterruptable power supplies to the oil pumps, if these failed or something in this system failed will be part of the investigation. If the hydraulic oil pumps for both C units ran off the...
  4. MDEAus

    Callide Power Station

    reasonably well-known in closed circles, What I am hearing from these closed circles is slightly different to this but I've been asked not to share as they have been told not to "speculate", not to say that this couldn't have been the reason for the explosion but it might not have been the root...
  5. MDEAus

    Callide Power Station

    AEMO Prelim report I don't think anyone had posted it yet. 13:34 Unit 4 stops generating power while remianing connected to the power system(first big drop in frequency on the above graph)Generator starts drawing approx 50MW and 300MVAr. 13:40 CS energy report turbine hall fire. 13:44 C3...
  6. MDEAus

    Callide Power Station

    Because in Queensland they are state owned. Other states have done 99year leases but Queensland for various reasons didn't, even though we started down the path of privitisation(starve for funds, and split into smaller companies).
  7. MDEAus

    Callide Power Station

    Actually judging by the frequency plot it appears that C3 did trip off before 13:45 sending the frequency through the floor (as lossing 400MW would do). C4 didn't have a much effect on the frequency after droppping out. Still 4 to 5 minutes between C3 tripping and C4 ceasing to exist.
  8. MDEAus

    Callide Power Station

    I think you are right about the sampling rate squewing the plot, although it would still be interesting to see why Unit C3 still tripped first even if only fractions of a second(but due to polling rate of data it's logged as 5 minutes earlier). Either fire fighting/electrical safety would have...
  9. MDEAus

    Callide Power Station

    Gen output according to NEMlog was approx 280MW, they had ramped down from 400MW as per an early post. Power state had been pretty steady at 280MW then it had an unplanned disassembly.
  10. MDEAus

    Callide Power Station

    Not a concrete floor but a steel grid mesh floor, not enough spalling for concrete floor, during overhauls they cover with ply wood. Highly energetic failure for sure though, LP and generator didn't suffer like the IP HP side. I bet the person who ordered everyone out of the turbine hall is...
  11. MDEAus

    Callide Power Station

    This one should be bigger.https://files.engineering.com/getfile.aspx?folder=91862653-817a-4753-8e4e-aa811417d085&file=callide_3.jpg
  12. MDEAus

    Callide Power Station

    This is a screen clipping from the below video, bottom right is the HP IP turbine then in the centre is the LP and then on the left is the generator. https://youtu.be/qEWAFgxRXa0?t=26. Turbine hall was evacuted before the incident, by reports due to the "turbine not sounding right" and...
  13. MDEAus

    Callide Power Station

    Finally a picture, it's behind a paywall though and it's ant size. the attachement is the best I could do.https://files.engineering.com/getfile.aspx?folder=80d3e568-778f-4866-b677-60cbdba9fa69&file=Callide.png
  14. MDEAus

    Callide Power Station

    I need a refresher on Turbine controls! I only had a 3 month stint at a local coal power station as an undergrad. With a 'reverse power' situation is that likely to speed up or slow down the turbine? I could see how a stuck steam valve would overspeed once the generator load is removed. The...
  15. MDEAus

    Callide Power Station

    The unit (CPP 4) had ramped down from 400MW output to roughly 280MW from about 12:00 to roughly 12:45, and maintained that until it ceased output at 13:55 (CPP 3 Tripped at 13:50 according to NEMlog). CPP 3 had been ramping 280 up to 430MW at the time it tripped out. GCB reportedly stayed shut...
  16. MDEAus

    Callide Power Station

    From reports, I have heard there was an issue with the generator circuit breakers on a turbine trip. Generator become a motor overspeeding the turbine until turbine blades let go. This is all third or fourth hand rumours so take what you will from that. My initial thought was hydrogen explosion...
  17. MDEAus

    thread815-418158 Once bitten twice

    Dik, There is a few mines going solar with no need to interconnect to the main grid (Vast distance makes it unfeasible). The national grid doesn't even cover every state. I think a large proportion of projects are planned close to existing transmission lines. For example there is a large solar...
  18. MDEAus

    Boeing 737 Max8 Aircraft Crashes and Investigations [Part 2]

    To use an analogy of working the hand wheel to trim the aircraft under high loads. Big game fisherman do a similar thing, it is far easier to use both hands to pull on the rod and then as they drop the tip quickly wind any slack up then use both hands to pull on the rod again. Alistair what do...
  19. MDEAus

    Boeing 737 Max8 Aircraft Crashes and Investigations [Part 2]

    I'm noting a few things here, my main concern is that this isn't entirely a repeat of the Lion air accident. I have a few questions before I get into any speculation. at 05:35:45 we see that the aircraft leaves the ground based on altitude readings (pressure and radar), yet approximately the...
  20. MDEAus

    Boeing 737 Max8 Aircraft Crashes and Investigations [Part 2]

    Thank you Alistar, Is it possible that MCAS is triggering before any stall warnings are active? I know we are limited on the knowledge of MCAS system but if it is activating only from AoA input (lion air had faulty input for some reason), What does the FCC use to determine stall? Lion air had...

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