Trans Energy Solutions

Nodalus Software

Engineering software for power and traction networks, built in South Africa. Draw the network, run the studies and produce the reports, on your own Windows PC.

Download the installer Why Nodalus See the features

Nodalus Power Flow showing a 132/66/33/11 kV single-line diagram with load flow results and a results table

Easy To Use Drag-And-Drop User Interface

Two products, one suite

Nodalus Power Flow

A single-line-diagram editor and study suite for transmission, distribution and industrial networks.

View Power Flow features →

Nodalus Traction Power Simulator (TPS)

Railway electrification studies for 3 kV DC and 25 kV AC systems: trains, substations, overhead line and protection.

View TPS features →

Why Nodalus

Built for the studies engineers actually run

One desktop suite for network studies and railway power, made in South Africa and supported by the people who wrote it.

1Your data stays with you

Runs on your own Windows PC
Network models and results are not uploaded to a cloud service
No browser account to manage

2Power and traction together

Network studies and railway electrification in one installer
Import a train run into a network study as a time-varying load
Rare in a single package

3Studies beyond load flow

Protection, harmonics, motor starting and transient stability
Compensation, FACTS, earth grid design and DC auxiliary systems
One diagram feeds every study

4Methods you can follow

Studies follow published methods, such as IEC 60909 for short circuit
Results appear on the diagram and in tables you can export
CSV and report export from the result windows

5Local support

South African company with local contact by phone and email
Questions answered by the engineers behind the software
Licensing and invoicing in South Africa

6Simple to start

One installer, drag-and-drop diagram
Try the full software free for 7 days
Licence per computer, with a volume quote for teams

Nodalus Power Flow

Network studies from one diagram

Draw a single-line diagram, enter the equipment data, and run the studies below. Results are shown on the diagram and in tables, and can be exported to CSV or a report.

1Diagram editor

Drag-and-drop single-line diagram
Buses, lines, cables, transformers, generators, motors, loads, capacitors
Undo / redo, zoom, pan, save and open project files

2Load flow

Bus voltages, branch flows and losses
Flow arrows shown on the diagram
Scenarios for what-if comparisons

3Short circuit

Fault levels at buses
IEC 60909 method
Results feed protection studies

4Unbalanced and single-phase

Phase-domain studies for unbalanced and single-phase networks
Voltage unbalance factor (VUF)
Suited to traction and rural supplies

5Protection

Overcurrent relay coordination with time-current curves
Sequence of operation for a bus or line fault
Distance and line differential protection studies

6Motor starting

Voltage dip during motor start
Results shown on the diagram
Flags buses below the limit

7Harmonics

Harmonic distortion (THD) by bus
Voltage spectrum chart with limit line
Harmonic filter sizing

8Transient stability

Generator swing and recovery after a disturbance
Detailed generator, exciter and governor models
Plots and report tables

9Compensation and FACTS

Capacitors and reactors
STATCOM and SVC
Series compensators (TCSC, SSSC)
Compensator effect and sizing studies

10Traction link

Import a TPS train run as a time-varying load
AC or 3 kV DC substations
Harmonic source for 6- or 12-pulse rectifiers

11Renewables and storage

Solar and wind plants as network sources
Grid-connection checks
Storage studies

12Reports and export

HTML study reports
CSV export from every result window
Word report export from the earth grid tool

13Contingency and time series

N-1 outage runs, including networks with STATCOM and SVC
Time-series runs over a load or generation profile

14Earth grid design

Grid resistance, ground potential rise, touch and step voltage
Checked against tolerable limits (IEEE Std 80 method)
3D view of the grid and rods
A screening calculation: have a qualified engineer review it

Short circuit results on the single-line diagram: Ik and peak current at each bus, with a results table — Run Short Circuit Analysis And Protection Grading With A Click Of The Mouse

Harmonic study: THD on the diagram, voltage spectrum, frequency scan and results table — Check Harmonic Distortion Against Your Limits At Every Bus, Right On The Diagram

Distance relay study — Test Distance Relay Zones Against Faults Along The Line

Transient stability — See Whether Your Generators Stay In Step After A Fault

Earth grid design: touch voltage surface, illustrative approximation — Check Touch And Step Voltages For Your Earth Grid Design

Screenshots use an example network with illustrative values. Click an image to enlarge it.

Nodalus Traction Power Simulator

Railway power system studies

Model the line, the substations and the trains, then see what the supply has to deliver. Built for 3 kV DC and 25 kV AC railways.

1Network and substations

Substations, feeding arrangements and sections
Overhead line and rail impedances
Multi-substation chains with shared load

2Capacity studies

Single train, two trains and convoys
Timetable simulation with several trains and substations
Substation loading and voltage along the line

3Train performance

Locomotive and wagon data, track profile
Speed, gradient and resistance effects
Distributed power for long consists

4Railway protection

Fault levels along the line
Protection settings and reach checks

5Harmonics

Harmonic analysis of traction loads
Assessment against IEEE 519 limits

6OHTE interference (EMI)

Induced voltage on nearby conductors
EN 50121-4 and ITU-T references

7Renewable integration

Solar supply to traction substations
SA Grid Code references

8Reports and data exchange

CSV results export
Export a run to Nodalus Power Flow
Word and chart reports

Locomotive classes tab with traction effort and line current curves — Load Customized Traction Curves

Import Track Geometry

Simulate and results tab with voltage, current and power charts and a live readout — Get Results At A Click Of A Button

Potential regeneration tab with regenerative current and power charts for two trains — Check Your Potential To Regen

TPS results depend on the data you enter (track profile, train loading, substation ratings). Check them against your own design standards before relying on them.

How To Buy

Simple Licensing

Download the installer for free. A 7-day trial key and the installer password are issued by Trans Energy Solutions on request; a licence key unlocks the software after that.

Evaluation

Free Trial

Free

Full software, 7 days, on request

Download the installer, then ask us for a trial key and password. Activation needs an internet connection.

The full licensed software: every version 1 study, for 7 days
Nodalus Power Flow and the Traction Power Simulator in one installer
Runs on your own Windows 10 / 11 (64-bit) PC
Trial key and password sent on request; the 7 days start when you enter the key
One key activates one computer
Open-source notices included

Download Installer Request Trial Key

Full Software

Licensed Edition

Nodalus Licence

Custom Quote

Product key and installer password, per computer

All version 1 studies unlocked, for engineers and design firms.

Load flow, short circuit, protection, harmonics and stability studies
Installed together with the Traction Power Simulator
Licences are issued for a fixed term (for example one month or one year); ask us which suits you
One key activates one computer
HTML reports and CSV export
Licence agreement shown at installation

Request A Quote

Organisations

Teams And Sites

Let's Talk

Several computers or sites

Licences are per computer. Tell us how many computers and sites you have and we will put a volume quote together.

A volume quote for your number of computers
Questions answered by phone or email

Contact Trans Energy Solutions

Prefer to talk? Call +27 10 825 8550 or email Info@transenergy.co.za.

Download

Nodalus installer for Windows

One installer for Nodalus Power Flow and the Traction Power Simulator.

Version	Version 1
Released	30 October 2026
File size	300 MB
Platform	Windows 10 / 11, 64-bit
Memory	8 GB RAM recommended

Download Nodalus Setup

If Windows shows a "protected your PC" or download warning, check that the file name and publisher are right, then choose More info → Run anyway. Contact us if you are unsure.

Product key and password

The installer is free to download. To use it you need:

an installer password
a product key, entered in Nodalus Power Flow

Request a 7-day trial key and password, or buy a licence. Both are issued by Trans Energy Solutions. Contact us:

Info@transenergy.co.za
+27 10 825 8550

Installing and using the software is subject to the licence agreement shown during installation. Open-source components are listed in the notices file that comes with the software.