Versions history

Version 4.2.1 - November 2021

Fixing bugs version:

               - BCTRAN model : fix calculation issue when running the case in EMTP 4.2

               - Hysteresis fitter : fix calculation issue when running the case in EMTP 4.2

               - TRV breaker : unlock options which were unavailable in EMTP 4.2 TRV breaker


Version 4.2 - September 2021


New Line/Cable data module

  • New module for calculation of line and cable parameters based on the MoM-SO method. This tool results from a major development effort by EMTP® team, and a direct collaboration with Prof. Piero Triverio and his research associate Utkarshr Patel from University of Toronto.
  • Major new EMTP® module capable of achieving highest accuracy levels for a very large band of frequencies.
  • The module is generic and capable of representing cables underground and above ground, overhead lines and overhead lines coupled with cables. A multi-layer soil option is available.
  • The module accounts for proximity effect, stranded conductor and earth return.
  • Unique contribution to the simulation of electromagnetic transients.


new line cable data module

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New Power Electronics Toolbox

  • Various building components.
  • New AC-DC converter with control.
  • New Statcom model.
  • New DC-DC AVM converter.
  • New examples with Toolbox models.

New Power Electronics Toolbox

Renewables Toolbox Updates


  • Upgrades to PV and WTG models.
    • Better initialization.
    • Various improvements (generic models).
    • PV cell.
  • New Battery model.
  • Improvement of convergence criteria for Input Impedance TD device.
  • New example of PV converter with MPPT and battery.
  • New charge/discharge battery example.


New Renewable Toolbox Updates

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New Asynchronous Machine Database


New Asynchronous Machine Database


Exciters and Governors toolbox Updates

News models available in the library:

  • Governors: WEHGOV, WESGOV
  • Power system stabilizers: PSS2C, PSS3C, PSS4C,
  • Stator current limiter: SCL2C
  • Voltage regulator: IEEEVC


Transformer model improvements

  • New magnetization data option: it is now possible to use excitation test data directly in voltage and current (pu).
  • Air-core inductance value may be entered as an option for adding an extra segment to magnetization data.
  • Tap ratio input is now available.


Improvements to PQ load with load-flow

  • Allows Delta connexion.
  • New input options:
  • Positive sequence Data or 3-phase data
  • Connection type


Breaker for TRV model improvements


  • IEC 62271 - IEEE C37.013 standards are now available for System source fault, generator source fault and Load-current switching.
  • New example of Generator TRV.
  • New example of maximum degree of Asymmetry determination for Generator.


PSS®E import tool improvements


  • Custom device usage option: allows to import a user-defined device
  • Import only specific part: allows user to import only specific part(s) of the RAW file.
  • Read-only option licence available.


Simulink module for EMTP® update


  • Compatibility with Matlab 2021a


Version 4.1.3 - October 2020



1 .  Fixed an issue with web pages not showing correctly on some computers.
2 .  Further upgrades to PSS/E tool.


Version 4.1.2 - September 2020



1.  Copy paste action cancelled in L nonlinear device when no data or data error from the data calculation device.
2.  Copy paste action cancelled in ZnO arrester when no data or data error from the data calculation device.
3.  The View Steady-State device button is not needed anymore and has been moved to the ribbon.
4.  Option for enabling load-flow or steady-state visualisation in View Steady-State.
5.  Account for new circuit case when automatic refresh of load-flow or steady-state solution is occurring without selections in View Steady-State device.
6.  Place all devices from Lib: fixed an issue when invisible device exists in the design.
7.  Moved MPLOT help to MPLOT folder.
8.  New option for automatic transition from load-flow to time-domain simulation or frequency scan simulation.
9.  New script for preparing parametric studies: prepare_parametric_case.dwj.
10. New scripts for parametric runs: startemtp_userunemtp.dwj and starte_emtpwithoptions.dwj.
11. Upgrades to template file.
12. New Cable database.
13. New PSS/E tool.
14. Various changes in Input Impedance TD: changes to fix memory issues and incorrect behaviours in some cases.


Version 4.1.1


Improved Simulate ribbon with keyboard shortcuts and options for following Load-Flow with Time-domain automatically.

New View Steady-State ribbon menu for simplifying selections.

New View Steady-State data extraction scripting options. New amplifier model

A new power amplifier model that can be used for aggregation of wind farms and other renewable energy sources. It is solved simultaneously with network equations: no time-step delay! The amplifier is available in both 1-phase and 3-phase versions.

Renewables Toolbox

Various improvements in performance and presentation. New built-in options for selecting scopes. New detailed wind park example.
Improvements to impedance scanning tool (Input Impedance Time-domain) for detecting unstable conditions with integrated renewables or for extracting equivalent impedances from complex networks. This powerful tool uses perturbation technique in time-domain computations for extracting positive sequence impedances for a specified range of frequencies. It is now faster and more accurate!

New amplifier device for easy park aggregation.

Meters library
Several changes for easy transitions between 1-phase and 3-phase versions. Rearranged naming for consistency. Redesigned symbols for less visual space. New meters: see 3-phase version of “Power: p(t) and q(t)” for calculating the sums of individual phase powers and new “Voltage scope”.

Fault device: new inductance option.

Examples: new GMD (Geomagnetic Disturbance) test case based on IEEE-118.

Version 4.1

New Renewable Energy Toolbox


This advanced Toolbox brings a variety of building blocks and tools for studying the integration of renewable energy sources into power systems.

The Type-III and Type-IV wind turbine models have been redesigned to improve automatic initialization and performance. A new Harmonic model tab is now available. The Harmonic model equivalent provides fast means for frequency-scan, steady-state and time-domain simulations and for determining harmonic distortion levels.
New and sophisticated Photovoltaic (PV) system models allow to study aggregated PV parks as well as individually connected arrays. A large manufacturer database is available and allows a single-click selection of PV module parameters. The Harmonic model option is also included for PVs.

Both detailed and average-value converter versions are available for PV and wind turbine models. All protection systems and standards are now fully customizable.

An advanced yet easy-to-use Scanning tool provides means for detecting and studying subsynchronous control interaction (SSCI) problems with inverter based systems. The scanning tool is generic and applicable to arbitrary network configurations with power-electronics control systems. SSCI may occur, for example, between a Type-III wind turbine control system and the series-compensated transmission line to which the wind park is connected. Not only the wind turbine control parameters, but also the wind park operating conditions can be varied to detect abnormal SSCI conditions.

New Library Power Electronics


This library provides several models and building blocks for commonly used converter systems. Various rectifier and converter models are provided in detailed and average-value versions. The detailed nonlinear IGBT model can be used to build accurate converter circuits. This library is establishing the basis for new developments to be released in upcoming versions.


Other improvements


1. A new Transient Recover Voltage (TRV) circuit breaker option now allows to automatically calculate the cleared short-circuit current input field. The TRV analysis plots can now be visualized in a single-click.
2. A new Fault device is now available in the Switches library. It is combined with the new Short-circuit ribbon to simplify various fault setting conditions at arbitrary nodes. It includes an Arc Reignition model and provides means for Random fault timings with the Statistical Options.
3. A new "Sample in File" device allows to collect simulation results at arbitrary locations and save into user-defined files for various visualization purposes. A sample enabling pin can control the sampled intervals.
4. The new "AC voltage source and impedance" device provides various means for entering short-circuit powers and currents with X/R ratios.
5. Several new Load-Flow and Steady-state phasor visualization options have been integrated to provide better messaging, data refreshing when navigating between subcircuits and reporting into Excel files. It is now possible to save all current phasors in addition to voltage phasors.
6. The EMTP® GUI has been upgraded with various new scripting options and methods.
7. The Protection Library license is no longer required for on/off-delay devices. Devices of this family which are included in EMTP® designs from previous versions must be updated to remove the license requirement.


Upgrade to version 4.1:

Customers under a valid maintenance contract can upgrade their license(s) to 4.0:
If you do not have an account on the EMTP® website or for any installation problem, please contact our technicial support team at


Information for customers without a valid maintenance contract: If you wish to upgrade your license(s), please contact our sales teams:

All request except USA +33 (0)442 610 229
USA +1 608 203 8808
+1 727 288 8100
Local distributors  




Previous versions:

Please note that any version anterior to 2.2.1 cannot be upgraded anymore.

Version 4.0.2 - November 2018

Version 4.0.1 - August 2018

Version 4.0 - July 2018

Version 3.5 - May 2017

Version 3.4 - August 2016

Version 3.3.1 - June 2016

Version 3.3 - January 2016

Version 3.1 - August 2015

Version 3.0 - November 2014

Version 2.6.1 - May 2014

Version 2.6 - December 2013

Version 2.5 - August 2013

Version 2.4 - August 2012

Version 2.3 - January 2012

Version 2.2.1- July 2009

Version 2.1- October 2007

Version 2.0.1