Beautiful.
This is exactly what I was looking for - the what do you apply and where, (and why of course) and some of the underlying math behind it.
The only follow up I have right now involves your formula for distortion power factor:
How do you actually calculate your D^2 and Q^2, let's say...
Guys,
I appreciate the help. I have done plenty of homework on this (in school and on my own time). I do not believe that anything I have written demonstrates a lack of understanding of the fundamentals.
Sibeen, I understand that P = IV. Thanks for the graph, but what have I written that...
Thanks ScottyUK; that does help.
So in a case where a major EPC company has a contract to complete work, there are transducers scattered around a plant and they sub out to a DCS expert, would the DCS expert generally perform the actual labor for running their field interconnect wires and...
I see.
In a case where there are PLC/DCS folks and other EPC firms involved..
Is the main info that people need to know essentially whatever data or information is being communicated?
ie: I suppose the overall goals of the DCS system are established --- what systems it needs to control, HMI...
I fear this will get heavy but let me trudge on:
So, power factor is an abstration.
In the case where you have a perfect sine wave voltage waveform, and a perfect sine wave current waveform with a phase shift, this is where you are saying you can use switching mechanisms to control the amount...
So there are OEM DCS manufacturers, and engineers which specify and design/use them?
How does this work usually get divied out, in terms of project management, by industry?
A lot of questions.. Mainly just trying to get information at this point. I don't know who provides SCADA services, and is it typically a design build field? In other words, does the manufacturer of the control/scada system also provide the engineering design to make the thing work? Or is it...
And you mentioned orange equipment. If this was in a refinary, industrial setting, it might not be a big deal but ultimately remember that the customer pays the bills for the project, and if a customer gets an orange transformer delivered and they hate it, this could be a problem.
I've never...
Yes I am also unaware of any code requirements for the color of equipment. As a matter of fact, I've seen some very oddly colored equipment (non grey, green), and I've seen equipment specified for more 'themed' and specialized applications.
As far as conductors go, yes there are standards...
All,
This is something that I am new to, but I have heard this mentioned as something that is possible to do.
It doesn't make much sense to me purely being able to do PF correction with software - I am imagining that all the software does is act in a control loop to control the amount of VARs...
I am also curious what importance you would ascribe with your understanding of the OSI model with various communication standards, etc. For those of you who are familiar with DCS, HMIs, PLC programming, etc... Did you come to learn simply through experience, or did you take a very structured...
Good table manners? Really? I wholeheartedly disagree with that statement. I don't think they're important at all.
I’m not sure if that was serious or not.
I think one of the most important characteristics is competitiveness. It doesn’t have to mean competitiveness with co-workers, but it...
Can anyone recommend some good reference material on DCS systems? I don't encounter them a whole lot in my current position but would like to learn more. I need something that's both introductory, has many applications to look at, and hands on (I learn by doing).
Thanks-
I wasn't aware that GPS was a 'feature' that came with any PLC. Thinking out loud, I'm wondering how the designs of the Garmins, TomToms, etc, pull off a system that they can make and sell for 100 dollars.
I'm not sure on your request for 50Hz 240VAC. I was under impression that PLCs...
Measuring the harmonic content would involve using what is called a spectrum analyzer. It performs a FFT across the frequency spectrum and would key you in on what the harmonic output of your 60Hz waveform was.
Then would come the hard part: If you're lucky, pull up a datasheet on a 5/6th...
Jerry,
I think conceptually if you picture two sources in parallel, that might help in understanding what is going on when a power source 'sources' to the grid. Its frequency and voltage will be within a range very close to the existing frequency and voltage on the grid, and with loads that...
That's exactly the kind of information I am looking for!
How about SCADA systems? How about generators? I would love more information on approximate market size, any/all big players in the market (and history of mergers, deaths, etc). I find all of this very interesting.
It's tough to...
Help me understand here: When we're talking about inductance, (or capacitance for that matter), in terms of the frequency response we are effectively talking about a filter. It then makes sense that the higher frequency carrier which has the actual data on it won't make it through. But if...
At this point it's mostly ideas bouncing around in my head - sometimes I get really excited about an idea, and most of the time, I learn later why either it won't work or that someone has already done it. So I'm keeping it tempered and not going spout it out. I'm hoping the one time it is a...
