you can try inkscape, its an open source software. I think it will be sufficient for single line diagrams. you can download it from following website.

https://inkscape.org/en/

PSCAD

https://www.powersystemdynamics.com/index.php/cad

Dear Aluisio Cesar

I agree with my colleagues Mr. Kiran Kumar Challa and Mr.Mohammed Qasim Taha inkscape and PSCAD are very useful programs.. I use them in my works..

Best regards

Thanks a lot,

Mr. Kiran, Mr. Mohammed and Mr. Omar for your contribution.

I am going to try the Inkscape and PSCAD.

Att.,

Aluisio

Aluisio,

What level of power system (the major part of it, I mean) are you talking about ? Generation, transmission, or distribution ?

-Sanjay

According to me ETAP

Hi, Sanjoy.

My focus is Transmission planning.

Thank you, Mustafa Yilmaz.

Att.,

Aluisio

I am using Inkscape at the moment because it is free, however, it is a general drawing software (open source) similar to Corel Draw ,i.e, based on vector drawing.

One easy and have most component built in is Visio from microsoft (not free).

Hello Aluisio.

For me is EPLAN (www.eplan.com.br). It is a robust and covers industrial or more simple needs. You have a lot of videos learning how to get the software and how to use it.

Have a nice day!!

Flávio Cruz.

Hello, Flavio.

Thanks a lot. I am going to test EPLAN also.

Best regards.

Aluisio

I’m used to use the Microsoft Visio. However, recently, I have tried the draw.io software and it seems to be good enough to me. You can download it from https://www.draw.io.

Hello, Varrichio!

Thanks a lot.

I am going to try also the draw.io.

Att.,

Aluisio

DIgSILENT PowerFactory is a good network modelling software with very good SLD capability. I used it to draw sub-transmision a(110kV, 33kV & 22kV) as well as distribution (11kV) network SLD.

You can readily trace over existing diagrams. That makes your network model look identical to system diagrams used in the organisation.

DIgSILENT Powerfactory is a commercial network modelling software package. Following is from their website:

PowerFactory - DIgSILENT https://www.digsilent.de/en/powerfactory.html

PowerFactory is a leading power system analysis software application for use in analysing generation, transmission, distribution and industrial systems.

The best is PSS/E

Dear Aluisio

It is recommended to try using VISIO program

Regards

I use Microsoft Visio and it works fine for me every time.

You can use Microsoft visio, ProfiCAD, Edraw, SmartDraw and Solidworks

EasyPower, OneLine Designer

https://www.easypower.com/products/oneline-designer

Hi Aluisio

I use microsoft visio for this kind of presentations

I used to use the ETAP (by the OTI) for drawing single-line diagrams. In addition, the drawing may be used in a later stage for simulating the system after properly adding its parameters, and settings.

Microsoft Visio is very good.

I recommend to use Microsoft Visio. It's very easy

I have used Microsoft Visio frequently. However, I have tried the draw.io desktop software, and online version also. It is seems to be good and download it from https://www.draw.io.

Visio.

VISIO

Recently, I found some apps of the google store that facilitate easy-to-use drawing tools of electric circuits. Some of them even can draw 3D diagrams.

CorelDraw

Microsoft Visio is a good one.

Microsoft Visio 2007 more advanced

MS Visio , Workbench, CAD, E-Draw ,PSCAD

I prefer the Microsoft Visio

VISIO

Coreldraw is very easy in use and has many features

draw.io Very interesting and free :-)

AutoCAD, Bentley Microstation, AVEVA Electrical are some most widely used software for drawing Single Line Diagrams. These software’s are drafting software i.e you just use them to draw Single Line Diagrams.

ETAP is used for power system analysis and deciding the type of connections to be made in the network and  equipment ratings to be shown on the SLD.A rough draft of the SLD gets its completeness after the ETAP results are implemented on it.

Dear Sir

you can use ETAP. in addition you can use AUTO CAD software in order to show your Single line diagrams.

MS-Visio 2010 is good for this. or MiPower.

AUTO CAD - Electrical , Smartdraw , Multisim,

PS-CAD is also having potential

MS-Visio is very good for this.

ETAP is good at power line analysis

undoubtedly Visio....its simple and the clarity is great.....

Though, beginners feel difficult to use the MS Word for drawing diagrams, the clarity of the pictures after taking screen shot of zoomed version is very good. Hence, I advise that you can try it once.

Microsoft VISIO

I found Circuitlab, an online application, which provides very good results: https://www.circuitlab.com. The diagrams have a very good appearance.

Thank you very much Sir.

Microsoft visio for long term solutions.

Edraw Max

Microsoft visio

You can use visio for any drawing. It is usable in electrical eng.

Microsoft Visio software is used to connect any kind of line and connection. It can be made in any type of diagrams, such as mechanical, electrical, civil structure and management.

Microsoft Visio. I am using the software since last 5 years. It has a vast library which includes the symbols for many electrical and electronics components. On the other hand it can also be used to draw flowcharts and many more. This software is easy to learn and pretty much user friendly.

Microsoft Visio

I also make use of Microsoft Visio. It is very simple to use. You can create your own stencil for frequently used items. It incorporates well into other reports if Microsoft packages are used (reports, presentations, etc.). The drawings can be exported in other formats for publishing.

draw.io OR Microsoft Visio

ETAP, Microsoft visio

Smart Cad

https://app.diagrams.net/

Tool used for drawing single line diagram

Srete Nikolovski thanks for your Useful suggestion sir .

Microsoft Visio

Hi. You can use AutoCad Electrical software

Microsoft Visio

diagrams.net/

AutoCad

LSPS

draw.io OR Microsoft Visio

Autocad electrical