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MicroTran version 3.11 - legacy


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MicroTran version 3.11 - legacy

Version 3.1 of Microtran has been superseded by version 3.2. The description of version 3.1 follows for the sake of reference.

Version 3.10 of Microtran has a combination of Windows-based and 32-bit DOS-based applications. It contains a number of programs and utilities designed to address most practical needs:







This is the simulation  tool for the simulation of electrical networks under transient conditions.  It is the fastest PC-based network analysis programs presently available.  MicroTran is very reliable and efficient.: a network consisting of 2000 nodes and 2000 branches requires less than 2 MB of memory.

The program's capabilities include the modelling of:

Lumped R, L, C elements.

Multiphase pi-circuits.

Single and three-phase n-winding transformers.

Transposed and untransposed distributed parameter transmission lines with constant or frequency dependent parameters.

Nonlinear resistances and surge arrester models (including metal oxide arresters), as well as nonlinear inductances with user-defined residual flux.

Switches with any number of opening/closing sequences, and other switching control criteria to simulate circuit breakers with multiple closing- opening sequences, spark gaps, etc.

Diodes, thyristors, and anti-parallel thyristor models with either fixed, or user-defined firing controls.


Voltage and current sources. In addition to standard mathematical functions (sinusoids, surge functions, steps, ramps), the user may specify sources point by point as functions of time, or calculate them inside the user-supplied subroutine SOURCE.

Synchronous machines with armature, field, and damper windings. The model also includes a shaft- mass system representation for the simulation of torsional oscillations.


Initial conditions can be determined automatically by the program or they can be supplied by the user. The program can also be used to obtain steady-state phasor solutions at a given frequency or over a user-defined frequency range. The "frequency scan" capability is particularly useful for harmonics, resonance and subsynchronous resonance studies.

User-supplied linear or nonlinear models using the entry point routine CONNEC. The procedure is quite simple: the user compiles his version of CONNEC with any compiler capable of creating a DLL. A sample version of CONNEC and detailed interface information is available to would-be developers.



Unlike other versions of the EMTP, such as the ATP, MicroTran does not suffer from numerical oscillations during the opening/closing of switches in inductive and capacitive circuits, respectively. This makes MicroTran ideally suited for the simulation of power electronics devices without having to resort to snubber circuits with unrealistic R-C values, and other traditional forms of suppression of numerical oscillations.



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This is truly ancient input data pre-processor. Unfortunatelly, it does not work properly in operating systems newer than XP SP2 without some rather involved workaround. This program provides user-friendly data entry which significantly reduces the steep learning curve traditionally associated with the family of EMTP programs. Some of the features of mtData include:

Menu-driven data case builder which assists in the step-by-step creation of a new data case;

Intelligent data editor, with data error checking;

Context-sensitive help with a substantial portion of the Reference Manual readily available on-line .

Click to enlargeThumbnail for mtdata

Easy-to-assemble devices such as transformers with built-in defaults and data sanity checks.

Click to enlargeThumbnail for mtdata

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The latest version of the output processing and plotting program mtPlot has a simple interface, but the underlying graphing engine is extremely powerful and cutomizable. It transparently identifies file formats of most EMTP-type programs, COMTRADE files, and plain column-based data in ASCII files:

Automatic scaling in linear and/or logarithmic scales.

Add text and lines to the plotted image

Line, bar, and scatter plots

Plot data from multiple files

Combine MicroTran results with data from other sources in the same plot file

(click to enlarge)


Print to a system printer or generate output as "jpg", "gif", "bmp" and other popular graphic formats files

Curve math

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The MicroTran package also includes a full-featured line parameters program mtLine.  Some of the capabilities of mtLine include:

Calculation of series impedance and shunt capacitance matrices of overhead transmission lines with an arbitrary arrangement of up to 100 phase conductors and/or ground wires.

Output in phase or modal quantities or as symmetrical components.

Elimination of ground wires and bundling.

Multiphase pi-circuits. Calculation of mutual impedances between power lines and communication circuits for interference studies.

Calculation of the electric field strength below transmission lines.

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This program provides support for the modelling of frequency dependent overhead lines.  MicroTran's frequency dependent line models can accurately take into account line asymmetries, skin effect and the effect of the ground return path and variable depth of penetration.

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MicroTran version 3.2

Version 3.20 includes a new cable constants support module as well as major upgrades in Mtline, Mtplot and the new Graphical user interface Mtdiagram.







In version 3.2, Mtline combines the capabilities of the previous version of fDdata and mtLine into a single intergarted application with an easy-to-use interface, and full-featured on-line help

mtline1.jpg (19716 bytes)

All modelling options previously split between mtLine and fDdata, are now integrated into a single-application

mtline2.jpg (15735 bytes)

Library conductor and tower management functions are integrated into the user interface.   The package comes populated with typical commonly-used conductor  and tower types.  However, they can easily be changed or added to the library to suit specific needs.

mtline3.jpg (34791 bytes)

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Earlier versions of mtLine allowed the calculation of electric field strength at ground level.  This capability has been extended and expanded to both electric and magnetic fields at an arbitrary height above ground

mtline5.jpg (67584 bytes)

This capability is very useful for quick EMF assessments!

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This is a  new support program for the calculation of slef-contained direct buried underground cables.  The user interface is very similar to that of version 3.2 of Mtline.

mtcable1.jpg (25340 bytes)

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Since the electric field (above ground) of a buried cable is zero, only magnetic field calculations are available.

mtcable3.jpg (21018 bytes)

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Version 3.2 of Mtplot continues in the tradition to provide a powerful output processor with a very simple and intuitive user interface.  The new features introduced in version 3.2 include:

Phasor diagrams based on the steady-state solution of a Microtran simulation

mtplot32_1.jpg (51097 bytes)

Optional dual Y-axis to compare parameters of dissimilar magnitude in the same graph.

mtplot32_2.jpg (54169 bytes)

Expanded curve math capabilities with an arbitrary number of elementary functions

Volt-time air gap tool that can be superimposed to a transient simulation to see if a given air gap is likely to flashover

TRV envelope assessment tool (both for IEC and ANSI specifications)

ASCII file export in plain column-limited format

COMTRADE conversion program now supports standard ASCCI and binary formats (C37.111.1999)

Harmonic analysis (based on the old character-mode utility harmonic.exe). 

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The main command console has been streamlined for ease of use. The concept of a "Microtran project" has been simplified for additional ease of use.

However, with the development of Mtdiagram, this application has now been downgraded to "legacy application" status

mtproject1.jpg (34848 bytes)


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Mtdiagram is a fully featured network schematic drawing tool and graphical user interface. All of Microtran command modules are integrated seamlessly.

The easiest way to catch a glimpse of the features of Mtdiagram is to download and view the introductory tutorials..


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Pricing and ordering

The following pricing information is given in US funds. Payment via direct bank transfer or with PayPal.  Credit cards cannot be processed.  Detailed payment instructions are provided along with the  invoice.

Starting in 2006 only the downloadable version of the package is available for purchase.  This means that only electronic versions of the documentation in pdf format are distributed with the package. 

Discounts are given to educational institutions.  The EMTP Theory book and hardcopy documentation can be purchased separately, although some restrictions apply.  Please contact customer support for details.




Standard version single-machine license


Standard version, second license:


Multiple-license version (3-10 users):

$3,500.00 for first 3 licenses +  $375 per additional user

With the purchase of a standard MicroTran license, users also receive 10 hours of consulting time.  This service can be used for advice in modelling issues, or to ask any engineering questions pertaining to power system modelling.

For complex problems requiring more than 10 hours of engineering time, Microtran Power System Analysis Corp. also offers consulting engineering services at very competitive rates.  Please contract customer support for details.




Standard version single-machine license


Standard version, second license:


NMultiple-license version (3-10 users):

$1,300 for first 3 licenses +  $100 per additional user


Starting in 2006, shipping and handling costs of hardcopy documentation are calculated on a case-by-case basis.  Note that the table below now shows average costs.  Actual costs will depend on destination. Note that all these documents are available in electronic form as part of the package




Regular Mail

The EMTP Theory Book, 2nd edition




MicroTran Reference Manual

Out of print

Compilation of Case Studies

Out of print

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Upgrade history

Version 3.23 of the MicroTran package is the latest version of the package, and it was released in mid 2008. It contains the new graphical user interface Mtdiagram which is still in the development stage (covering about 95% of the Microtran native models. The last 5% can be used via data modules)


New in version 3.23

Version 3.23 introduced the following features and improvements:


Version 3.11

Version 3.1 introduced the following features and improvements:

Version 3.1

Version 3.1 introduced the following features and improvements:

Version 3.0

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