Welcome to the web page of ATPDraw

ATPDraw is a graphical, mouse-driven preprocessor to the ATP version of the Electromagnetic Transients Program (EMTP) on the MS-Windows platform. In ATPDraw the user can construct an electrical circuit using the mouse and selecting components from menus, then ATPDraw generates the ATP input file in the appropriate format based on "what you see is what you get". The simulation program ATP and plotting programs can be integrated with ATPDraw. A license is required to use the solver ATP.

This web-site has been in operation since 2012. Users can register with email authentication by passing a CAPTCHA and an EMTP quiz. The web-site offers discussion forums with nested discussions, images/document uploads  and search functionality. By registering on this web-site users also get access to latest ATPDraw downloads (NOT the solver tpbig.exe). The Web-site was updated to Bootstrap styles April 1, 2016. The ATPDraw program can also be registered with the same user name and password and this gives direct access to web-content including one-click upload and download of ATPDraw cases. More contributions from users are expected and requested. All cases are moderated.

In most of June 2019 there has been a general access problem from ATPDraw to the server/database where atpdraw.net is located. The source of the problem is a server upgrade with wrong firewall settings made by the web-service provider. The problem was resolved on June 28. Unfortunately, there was also a second problem related to emailing of login information. This was partially solved July 6 and fully on July 8.


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Graphical preprocessor to ATP

  • Electromagnetic transients program
  • Time-domain analysis or steady-state frequency scan
  • Lightning studies
  • Switching studies
  • Harmonic analysis
  • Insulation coordination
  • Power electronics & HVDC
  • Electrical machines
  • Control systems
  • Line- and cable parameters
  • Windows XP/7/8. 32-bit.
  • What you see is what you get
  • Mouse-based CAD
  • ~300 library components
  • Extensive help file system
All components

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News Version 6.0

Internal parser

  • Change any data (except external in LCC, XFMR, BCTRAN)
  • Change transmssion line length via LCC section
  • Multiple core utilization. ATP runs hidden in background.

Power system toolbox, ver. 2 

  • Down sampling, FFT, DFT
  • Phasors, harmonics, rms
  • Voltage dependent load
  • PQ, RX
  • Relays & trajectories (over-current, distance, differential, over/under voltage/freq.)