applied_heat

Affects back to version 1.6.0 released Feb 14, 2013

Very interesting way of thinking about it, I don’t recall it ever being presented that way before. Thanks

Huawei is often blamed for stealing information from Nortel that led to Nortel’s bankruptcy, both information about deals being made that let Huawei undercut them and technical product details that allowed Huawei to more easily be a substitute for Nortel products

I or j don’t need to originate from Sqrt(-1) ?

I’m still using redmine. It allows me to create a project, break it down in to tasks, assign time estimates for the tasks, assign % complete, log time against tasks, which then allows for burn down charts so I can see if I am on track or behind. With time logged against projects I can generate timesheets and invoices. It also has Gantt chart which is handy for initial project planning meetings.

My wood siding is original cedar that has been painted several times since 1970s when house was built … I haven’t considered it not lasting indefinitely

The condo market is hurting the most. Which is exactly what people have been asking for - lower prices - achieved by vacancy tax, foreign buyer ban, speculator tax, and no rights for landlords.

Thanks for the reply and the link.

A machine with infinite inertia would resist any frequency change and instantly go to maximum or minimum power upon any grid frequency deviation.

A 25s inertia constant is impressive. The hydro units I work on are anywhere from 1s for newer units to 7s for older ones intended to run isolated networks. And then the ease of frequency regulation on the unit is dictated by the inertia of the water in the water conveyance system “water starting time”

So 25s inertia constant would appear to be a response to frequency change much faster and greater than the typical 5% droop implemented by the governors controlling mechanical power applied to the shaft.

Wild stuff!

>Beyond raw performance, the GC Flux PCS features advanced grid-forming capabilities, making it ideal for modern grid applications. It supports active inertia response up to 25 seconds, wide-band damping across 1–1500 Hz, and ultra-fast voltage and frequency regulation in under 100 milliseconds

I wonder what active inertia response is and why it is limited to 25 seconds.

The normal rotating machines have inertia, stored rotational kinetic energy, so when electrical load is added and mechanical power in does not immediately change they new load is fed by the generator very slightly Slowing down and measured by a decreasing frequency.

How would active inertia be different from the inverter simply putting out more power when frequency drops?

$2k? That’s a $100k project for a medium size Corp

Tell me about your experience and regrets with two beers a night please.

I still like redmine

Proxmox is based on perl? Can you expand on that? Web front end, vm automation…?

What kind of company do you work for that is doing so much embedded/controls type work? I program hydro power plants and governors with a 30 year mindset and no guarantee I ever get access to the plant again once I sign off as complete

What is the niche?

I do control systems that have to work first try and after running the plant through its paces I’m out the door never to return

It’s not like software outside of the hardware realm is perfect either.

What is the workload or query that is causing issues?

What hypervisor are you using for the windows vms?

For function block programming used in control systems in PLCs there are tools like copia.io that are basically GitHub for version control and can do visual diff of the diagrams

I swore them off after my last one. Mid 40s. All nighters used to be a source of joy though to get what felt like days worth of work done in a single sitting enabled by the absence of distractions

By thermal issues I meant electrical heating of windings in rotor,stator,transformer due to impedance changes with frequency.

I have only worked on one steam turbine and it had no issue running with the throttle valve wide open all day long.

Every system has a maximum continuous output capacity and I would expect the controls to limit the output so as not to damage the equipment.

I’m curious what sources you are aware of that can’t run at a maximum continuous output all day

There is no such thing as a frequency mismatch between the grid and the generator. There are frequency deviations from 60 Hz but turbine and grid deviate together

One of the parent posts correctly identified there are thermal issues with operating at significantly off nominal frequencies for extended time periods. System operators will specify frequency bands and minimum time a generator has to stay online for each band. For example we have to stay online indefinitely for frequencies 58.5 to 61 Hz, and can trip after 60 seconds for 57.5 to 58.5 Hz, and can trip instantly below 57.5 Hz.

Some plants the system operator has the ability to send a signal to instantly open the generator breakers to shed generation if necessary.

It’s all about using the right tool for the job. In control systems I have seen nightmares of for loops and if then conditions replaced by a skilled practitioner to a beautiful block diagram that solved the problem and illustrated to the reader the form of the solution.

They trim back what poses the highest risk with the budget they have.

As you have identified A wider right of way costs more.

Usually for lines above some voltage, perhaps 200kV, the cost of an outage due to a tree strike outweighs the cost of additional vegetation management so they will clear the right of way wide enough that no tree can fall and hit the power line.

Around here for 130kV the right of way is still as narrow as it can be and we annually take down the riskiest trees as this is the best for our budget, which is not unlimited.

What is Ubuntu doing?

They have been controlling hot water tanks in New Zealand for decades… probably since the 70s. They use what they call a ripple signal by adding 400 hz on top of the 60 and then relays on your hot water tank detect the 400hz and switch it off

I’ve been a happy redmine user for about 15 years. It may not look as flashy as newer systems but I appreciate the consistent UI which hasn’t broken, and someone is doing the hard work of making non flashy but extremely useful things like e-mail workflows, export as PDF, git integration, etc stay working

Looking forward to checking out your library, thanks for sharing it with the world.

I’ve been using kst-plot for live streaming data from instruments and interactive plots. It’s fast and I haven’t found any limit for the amount of data it can plot. Development has basically stopped - the product is done, feature complete, and works perfectly! It is used by European and Canadian space agencies. Maybe it will be interesting to you to see how they have solved or approached some of the same problems you have solved or will also solve !

30% overall, including night time. Honestly seems high to me and makes me wonder if they have overprovisioned panels vs the maximum allowable injected power to get a better capacity factor.