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Cleaning Up Your One-line. Does It Resemble a Ball of Spaghetti?

This refresher provides an overview of some of the recent improvements in EasyControls and discusses how large system one-lines can be better designed to avoid the bowl of spaghetti appearance of systems used by medical centers, campus complexes and large industrial facilities. We also show how to utilize a custom template to include Arc Flash results in all of your panel schedules.

See the full transcript of the webinar below.

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Full Transcript of the Video

Jim Chastain: Morning everyone. Welcome to the EasyPower Tuesday refresher. This is Jim Chastain with the applications engineering group. Actually, those of you that have visited before, visited our webinar site before, this is actually evolved to become our every other Tuesday refresher, as long as that Tuesday isn't the [00:00:30] 4th of July. Again, that information's posted on the website so we welcome everyone to the discussion. The topic for this Tuesday refresher is Cleaning Up Your One-Line Diagram offering suggestions and recommendations about some of the features that could be utilized in EasyPower that we don't often highlight, but they can actually add considerable [00:01:00] value to your project, especially on the front end.

As we usually do on the Tuesday refresher, we like to start with a poll question. Appreciate some feedback on basically what size projects you primarily work on and how frequently or how complex those systems are. Let me launch this poll and get a little bit of feedback. Again, appreciate the [00:01:30] feedback, appreciate your participation and your attendance. We basically collect this data as much as anything else to guide future presentations and make sure that we're directing the conversation to something that's more beneficial to the audience in terms of how valuable that feedback has reported.

Again, thank you very much for participating. Looks like we've got most everyone included here. Thank you [00:02:00] for your feedback. Here's how things look. It looks like there are some fairly large systems that people are involved with. The second question, how complex are these systems in terms of number of medium voltage content. The reason for the question, frankly, is that the redundancy and the different voltage levels [00:02:30] become more common in very complex systems and they present their own set of issues, and frankly the techniques and working with these can be valuable even on smaller systems. That's why I'm including that in this discussion, but far and away the more complex the system the more valuable some of these techniques are. Here's the distribution of the responses today, and pretty much I guess that's [00:03:00] what I've seen as far as feedback from incoming questions.

All right, so thank you very much for participating. Now let's kind of jump into this and I'll give you at least a sense of where we're headed. Now whether Abraham Lincoln said this or not, I really like this maxim and that is, "Give me six hours to chop down a tree and I will spend the first four sharpening the axe." Frequently, very frequently, in fact I'd put it [00:03:30] in the highest majority of people that start using EasyPower, jump into drawing the one-line diagram and try to draw the whole thing in one fell swoop, and then have to live with the consequences when it comes time to do the analysis or even just the short-circuit study.

Part of that is the learning curve, part of that is knowing what you've got to deal with, and then a lot of the unknowns if it's the first time you've done a study, but the bottom [00:04:00] line is the more time you spend planning the layout, especially for a large project, the better the return will be once you get into doing the analysis and having to generate the study results. Now the corollary to this maxim could be the cleaning up a messy project can amount to an even larger job than the original scope of work. So for those of you that already have a one-line diagram that resembles a bowl of spaghetti, [00:04:30] again I'm offering these as ways to either do your next project or at least in part be able to modify and improve the project you're having problems with.

Again, what we're talking about are features of EasyPower that are built in to the primary backbone of the GUI, graphical user interface, and they fall under the categories of what we call EasyControls and Name Views, the ability [00:05:00] to color code different parts of the system, either for voltage or just for physical separation. What I'm going to suggest is coming up with your own scheme, trying these, trying to anticipate whether or not your particular implementation or your particular scheme is going to fill your needs, and by doing that it may involve customizing either the layout or the color coding or the naming scheme [00:05:30] that you have, the labeling scheme.

And in some cases you may want to consider custom panel schedules and MCC schedule templates, both in terms of making the construction of the one-line more simplified and easier to understand but also easier to produce reports that are isolated or germaned as specific parts of the system. I'm going to touch on some of that and we [00:06:00] will refer you to other webinars we've had on some of these topics in the past. Far and away, the bottom line is planning the way you're going to attack the project. Again, I suggest frequently to start small. That is construct a very simplified one-line diagram that takes you from your energy source, which usually is the utility or a generator, and [00:06:30] draw just a single feeder downstream system to a load that you're going to need to produce results for, whether it's a label, whether it's incident energy, whether it's power flow, whatever you're trying to accomplish for the overall system, and anticipate or evaluate whether or not that particular scheme that you're using, the technique that you're using, is going to work for your needs. It very much becomes a trial and error because it's not one size fits all [00:07:00] and the tool permits these accommodations.

It's easier, as I repeat, it's easier to start off with a scheme in mind or a methodology in mind rather than to go back and fix stuff that you learn along the way. In some regards what I'm about to show fills that bill because I've started with a very simplistic run. I've tried and end terminus and I [00:07:30] want to verify that it's going to produce the results that I anticipate before I adopt this as my scheme. It may even mean that I go back and revise some of my technique going forward. That's basically what I'm trying to do.

Now, by all means, these don't rise to the level of recommendations or potentially even suggestions because your particular project or needs may not fit with exactly [00:08:00] what I'm presenting, but frankly some of this has been shared from other users and so I would encourage if you have come up with a way of doing things that assisted your implementation, let's do it and we can share that by all means if you don't have a problem with that.

All right, so let's jump into EasyPower and talk about some of this stuff and see how things go. Now, for [00:08:30] those of you that have sat in on some of my webinars in the past, one of the areas that actually was shared by the facilities folks at one of the universities suggests that if we have a common, in this case a ring bus distribution system, for our medium voltage, that that's a good place to start our analysis or [00:09:00] start our one-line diagram philosophy. What we're showing here is a ring bus of a campus system, in this case a college campus, where we have all the buildings cross-connected and then isolated from their downstream loads. By doing this we're able to simulate frequently the way that the college would deal with temporary power outages or [00:09:30] emergency power system channeling. The one downside to this, and I failed to mention this before, is that if we want to utilize this system in analysis it works pretty well when we go to short circuit if all we're doing is incident energy and short circuit current, so as I'm looking at my one-line diagram I could look [00:10:00] at any portion of it and do my short circuit analysis.

In this case we're doing a balance three phase fault and because I don't have too many loads here or ... Well, I can look at my incident energy and my fuses are all in tact. I'm getting fairly benign responses. The trouble is if I try to go into power flow I've got an isolated system, and that's due to the fact that I have multiple or two [00:10:30] utilities. One solution for this is to essentially delete one of the utilities and I'm going to obviously do that in database edit, select one of the utilities. Let's delete it and then cross-connect these or run an extender cable from this side to the other side. In [00:11:00] terms of just for incidence, and now I'm able to use this particular system layout for both short circuit and power flow.

Now, with that in mind, I want to go into some more of the details of how to handle this type of a system, but in this case we're not dealing with a ring bus, we have more of a redundant system. Let me jump out of this into the system that we were [00:11:30] looking at earlier where we have a number of medium voltage routes in our campus and on the side of the campus we have some switch gear and cross-connects that perform the same bypass capabilities for [00:12:00] all these medium voltage runs.

Here's the technique we started off for this project in EasyPower. First of all we developed this cross-connects distribution center as basically the heart or the mainstay of the one-line diagram. Ultimately we want to be able to run power flow and short circuit on this. [00:12:30] Although we stubbed off all of these distribution points, what we want to do is verify that this scheme is going to work before we go into too much detail and work developing the one-line.

What we've done is, if I go back to my PDF here, I can see I have a number of color schemes which were already done for this layout so I'm going to backpack onto that [00:13:00] by duplicating that. I'm following this light blue or teal routing and then verify that I can accommodate the different buses that are tapped off from this 12K line. But, in addition, see if I can't reflect the individual loads that are going to come off of this 1,500 KVA transformer. Let's jump into that and see how it's done.

First of all, [00:13:30] my one-line diagram is going to be very large as you would expect and the scheme that I've come up with, as I develop the download feeder, the downstream feeders, from each one of these tie-ins, it will have its own separate part of the one-line diagram for that routing system. And then as I pull off the individual buildings or facilities for each of the downstream feeders, it will have its own separate section [00:14:00] that can be modeled and amplified and zeroed in on. The way this is done, even though I have a one-line diagram that's spread out, I have saved the zoom and pan settings to be able to amplify that particular part of the one-line.

In this case we're starting off with the utility distribution. So even these are physically remote in the campus, I'm showing [00:14:30] these on my one-line as very close and there will be a difference then, obviously, for whatever routing point as to take these feeders down to the rest of the system. All right, so here's my light blue routing, and these are the cross-connect switches that we saw downstream. Here's a cross-connect between the light blue and the purple circle. The reason I amplify this is this is where I'm going to explode my downstream [00:15:00] facility to make sure that all this stuff is going to work when it comes to reports.

And then as we move on down the light blue router, I've set up the dotted lines as the buried distribution, and the solid lines as the elevated lines. Again, these are all 12 kV, 12.8 kV voltage distribution. And from that point each of the taps, each of the transformer taps off of this [00:15:30] distribution system will go then into my facilities with the different voltages.

Now, if I wanted to, let's say, add a separate load and explore this on my one-line diagram, I would do it thusly. All right, so I want to basically bring in another distribution system and I want to see if it's going to work with my system. If I look at my whole one-line diagram, which is [00:16:00] this, here's the bus I'm going to tie into and with another tool, with another project, with another person who has constructed the one-line diagram for this facility that I need to tie in, I'm going to open it up, have then email it to me and I want to open up this other file and he's got it pretty much complete.

I don't necessarily need his utility or [00:16:30] their utility so I'm going to take it off, but this is a 12.9 K utility feed so I'm going to left click and drag, control C to copy, go back to the window of the project I'm working on, and I want to put that particular building right here so I'm going to initially place it, control V to place it. Let's just drag it up here to start with. [00:17:00] Now we're going to have a cable run that's going to connect this bus with this fuse. All right, now I'm going to take and drag this new addition down to where I want it to exist in my overall system, which may be down- let's do this again- which may be down below. Part [00:17:30] of the trick is to make sure you only include that part that you want to extend. Let's take this right to there.

Now I'm going to bring this down to the part of my system that I want to amplify or isolate, and then as I zoom into it ... Now, [00:18:00] another feature I've come up with is I want this to be a specific color so this is on the light blue. By utilizing the color icon here at the top, I'm in the database edit, I've got this part of the system selected. I'm going to go in and pick out my color scheme. I guess I need to reselect it, use the pull down, make this my light teal color, and now it's part of my one-line. [00:18:30] At that point I would set a new view that includes this pan and zoom and then I would call it Jim's facility. Now it's part of the rotation scheme now as I move around my one-line.

All right, so next question. That's essentially my plan. I'm going to take this off [00:19:00] just because it hasn't been necessarily completed. Next question is is it going to produce the results I want? I'm going to take ... I'm doing an undo here just so that I ... And to verify that I'm going to go into, again, a system that I did bring down and tie into my transformer. We're going to call it the [00:19:30] vet ed transformer. The technique here as I've developed this facility, if I open up the one-line the representation of this cable, I can show the entire line. When I go back to my one-line diagram there is where it's connected in, whereas if I don't show it, if I say don't show the entire line, it stubs it off for me [00:20:00] and will tell me basically where it's going to go to in the system. Again, even if I haven't saved the pan and zoom settings I can use find and select and find that particular bus that this is stubbed off to.

All right, now I've got my one-line drawn, I've got basically the utility connected through my cross-connects. I'm looking at making sure I can develop the reports or the output that I want to use. Now we're going to go under [00:20:30] short circuit focus. It's saying I don't have any errors. Now when I false all the buses the tool is going to calculate the whole system for me. As I look at the arrange for arc flash you can see that most of my system, because I'm just in the trial and error stage, doesn't have any documentation for short circuit, so in reality I'm really only looking at this one facility to do this.

Let's [00:21:00] go back to make sure that I'm producing the reports I want. I can just select a portion of this one-line diagram, fault the buses, look at the results. Sure enough, I've got my upstream devices, I've got my type of equipment, air gap, bolted fault current, arcing current, incident energy trip times. If I want to look at equipment [00:21:30] duty it's showing me that I have some problems here. Again, it's just looking at this isolated portion. Once I get the whole system ... But the point is it's doing what I need it to do once I get things flushed out. If I need a report, let's say I want to produce my equipment duty report, let's apply it, look at my report and scan down the buses that I have [00:22:00] selected. Sure enough there's a warning and a violation that I have on that particular bus.

Okay, so for short circuit it looks like I'm in pretty good shape. Let's go back to a power flow. Again, power flow in a larger facility ends up being extremely valuable because by analyzing and optimizing the performance of the plant and everyday operations it can actually be more [00:22:30] beneficial and pay for the investment and developing the model for the arc flash study. If we developed this from all of nameplate data what we're going to get here the first time we do a power flow solution is to see essentially what the nameplate data gives us in an ideal situation.

We're going to look at branch flow. [00:23:00] Again, I've just selected these buses. This was the branch flow in each of these legs and we're showing, if we look at our options and the one-line output, for branch flow we're looking at megawatts and megavars so this is real and reactive power. We see a very large reactive power here for the motor load. Again, that's what we'd expect. [00:23:30] If we look at the overloads we see we have a voltage constraint here on the MCC and a current overload on this particular cable where we're showing it's rated for 620 amps and we're right as 601.

On the other hand, because we're using the nameplate data, all of these loads are running at 100% so [00:24:00] I can select those loads, go in and scale. I know my motors are running at 45% and my MCCs are probably running nothing more than 55%. By scaling those now on this isolated basis we can see that that eliminates the overload conditions. Now, as we get this completed and we don't select any particular bus but we solve the whole solution, [00:24:30] now we can see what the actual loads will be or should be and measure these in our actual system.

Now, once we've got this all completed, as we're in power flow because we've solved with no particular buses indicated, now it's showing us the power loading or the current loading on each of these utility transformers and we can verify if we isolate any of [00:25:00] the downstream loads that this shares the load equally between any of the buses that's downstream. Likewise, if we lose a utility or if we have to transfer loads over we can see how that current gets shared or not based upon what the cross-connects are doing in our cross-connect setup. The point is if ultimately my project I want to do power flow, [00:25:30] I want to do arc flash, I want to do coordination, I need to take that into account and try it on a very small basis before I jump into the whole facility and find out, "Well, I guess I didn't do such a good job after all."

Now another thing I might want to do is isolate particular loads in an MCC. The way that would be done is we go back to our main [00:26:00] one-line diagram. Actually I want to start with the ... And we can isolate each one of these drawings or each one of these subsystems and then pull out schedules. Again, as changes are made on the one-line they'll be reflected on our drawings, especially in terms of loading on the schedules.

Okay, so one, [00:26:30] I've been able to test out a scheme both using colors for my different voltage distribution systems, I've been able to verify that I can jump around a fairly complicated one-line diagram. The one-line diagram right now looks like this and my scheme is to take each one of these color distribution lines and draw it in a vertical scheme [00:27:00] and then break out the loads for that particular feeder system in some other part of my one-line diagram. And then I can save the pan and zoom, or in this case the focus, with my what we called Name Views settings.

[00:27:30] Then once I've verified that the color scheme is working for me, that my naming scheme is working for me, then does my analysis work? Does my short circuit? Can I produce fault currents in all the system? Does it work on an isolated basis? Can I produce the labels that I'm expecting when I need to produce arc flash incident energy? [00:28:00] From our arc flash hazard report we can show that we're bringing up a warning label that has the elements that I want and that would be the time that I customize to make sure I'm meeting all the scope of work requirements for the client or my facility based upon what I'm using [00:28:30] for PPE.

Okay, so I think that's all I wanted to cover. The bottom line is start small, use a lot of trail and error and then fix it. Try it again and fix it. Thank everyone for attending today. By all means check the website for updated schedules. We have [00:29:00] the balance of the year scheduled for regional training. We have on the website information on our Ground Grid Analysis new product that we're just rolling out. Welcome everyone to check it out and request information as it might apply to your project. Before I sign off I'm going to see if we have any questions and by all means look forward to talking to everyone down the road. Thank you for attendance.