PSAF-FLOW is the analysis module of PSAF reserved for power flow analysis in three phase electric power networks. Equipped with powerful analytical options and alternative solution techniques, PSAF-FLOW is a very reliable and user-friendly tool for analyzing Utility and Industrial power systems. PSAF-FLOW also features a powerful AC contingency Analysis module that automates "what if" studies for generation and/or branch outage(s) and/or Load variations.

This module is designed to assist the user with Power-Flow related contingency analysis. The module works in conjunction with the PSAF-FLOW module. Furthermore, the analytical approach used is the same as PSAF-FLOW, i.e. the contingency analysis is performed using full ac power flow solutions (no dc approximations are employed in the module).

The contingency module is structured so that an unlimited number of “what-if” scenarios can be included in a given contingency study. All contingency-related system modifications refer to the base case network. Single outages and/or multiple outages/modifications can be concurrently defined at will to represent an adverse .

PSAF-MOTORSTART is the analysis module, included in PSAF-FLOW, dedicated to simulating the effects of induction motor starting in three phase electric power systems. PSAF-MOTORSTART is an advanced, reliable and easy to use tool for estimating motor start-up time and for assessing system-wide voltage dips due to induction motor starting operations, through a wide variety of starting techniques.

This module calculates transmission line parameters in either sequence or phase domain with the additional capability of catering for modal analysis models as well as frequency-dependence. This module includes typical tower configurations and allows user-defined ones as well.

This module calculates the electrical parameters of cables for different installations. This includes Three-conductor belted cables (up to 15kV), Three-conductor common sheath cables, (15 to 35 kV), Single-conductor shielded cables (up to 69 kV), Unshielded low-voltage cables featuring no metallic parts and Multi-wire concentric-neutral cables (for underground distribution circuits).

PSAF-FAULT is the analysis module reserved for simulating fault conditions in three-phase electric power systems. User friendly data entry, a multitude of reports and flexibility in applying all industry-accepted standards are features that make PSAF FAULT an indispensable tool for these very common and important system studies.

PSAF-STAB is the simulation module reserved for simulating electromechanical transients in three phase electric power systems. Featuring an extensive library of equipment and controller models, the capability to include user-defined controls, a very flexible user-interface and powerful graphics, PSAF-STAB is the tool that helps engineers to tackle these delicate system studies efficiently.

PSAF-HARMO is the PSAF module designed to perform harmonic penetration analysis in electric power systems. The module features both single phase and full three-phase modeling capabilities. It can flexibly and easily be applied to utility type grids, industrial power systems and distribution feeders of any configuration.

PSAF-LINE provides an interface between the PSAF analysis programs and AutoCAD. It permits plotting the network One-Line Diagram and results. PSAF-LINE is completely integrated with AutoCAD version 14 and higher. The One-Line Diagram module constitutes an option of the PSAF-FLOW and PSAF-FAULT software, and it functions in conjunction with AutoCAD. There are three options in PSAF-LINE:

CYMGRD for Windows is the Windows-based program for substation grounding grid design and analysis. CYMGRD is specially designed to help engineers optimize the design of new grids or reinforce existing grids, of any shape, by virtue of easy to use, built-in, danger point evaluation facilities. User-friendly data entry through an intuitive GUI , a powerful and flexible AutoCAD interface and general-purpose algorithms, render CYMGRD an efficient tool that helps the engineer arrive at technically sound and economical designs.

The Cable Ampacity Program CYMCAP is a windows-based software package designed to simulate the thermal behavior of power cable installations. The original version of this package was developed jointly by Ontario Hydro, McMaster University and CYME International under the auspices of the Canadian Electricity Association. The well-known superior analytical capabilities of the package, coupled with an intuitive and powerful Graphical User Interface, efficient data base management and extensive graphical reporting facilities, make CYMCAP an indispensable tool for demanding engineering analysis.

CYMDIST for Windows is the windows-based distribution analysis software available from CYME International. CYMDIST is an advanced engineering tool, conceived to assist engineers in performing distribution planning, operation and optimization studies. CYMDIST is presently designed to accommodate radial or looped systems with multiple generation sources. The graphical user interface of the package renders the program efficient and very user-friendly. The user can build feeders graphically or import data from AM/FM/GIS software and visualize the results directly on the one-line diagram.

The MAP module is an add-on to CYMDIST that allows you to display raster or vector map images (geographical landbase) as layers directly underneath the electrical model. This option gives you full control over the screen view by allowing you to select and toggle on/off the different layers. It also gives you the ability to copy the map and the electrical model directly to the clipboard for pasting into other Windows applications. With this option you will be able to perform your simulation and visualize your results just as if you were in a view of your CAD or AM/FM/GIS system.

Example of a map and a part of the electrical distribution network:

The purpose of the Switching Optimization Module is to aid distribution engineers to determine the optimal feeder configuration in order to minimize losses, improve the voltage and balance the load among feeders. This module determines which switching devices should be open or closed in order to achieve your objectives.

The SOM module allows you to operate your system with the lowest losses while taking into consideration the operating constraints. The proposed optimal solution automatically respects constraints such as equipment loading limits and minimum satisfactory voltage. Our module allows you to start with abnormal conditions on the network and our solution will try to alleviate these conditions.

It is guaranteed that the proposed solution will not worsen the initial starting conditions. he optimal configuration is automatically created as a case study and is presented graphically for easy evaluation of the proposed solution. Various tabular reports are also available that allow you to see the improvements made by each recommended switching operations.

CYMDIST-HARMO is an add-on module designed to perform harmonic penetration analysis in electric distribution systems. The module features full three-phase modeling capabilities and is fully integrated with CYMDIST. It allows you to model known harmonic sources such as variable speed drives, rectifiers, arc furnaces as well as measured sources of harmonics.
This module allows you to analyze resonance conditions associated with capacitor banks installed on the distribution system by plotting the impedance and phase angle vs. frequency at any selected node on the system.

It also allows you to compute and plot the harmonic voltages and line currents for any selected components. It reports the standard distortion and interference factors such as the HDF (THD), KVT, IT and TIF.

The reports include plots, bar charts and tabular reports that are fully customizable.

The purpose of this module is to aid distribution engineers with predictive reliability assessment of electric distribution networks. The program computes a set of predictive reliability indices for the overall system such as MAIFI, SAIFI, SAIDI, CAIDI, ASAI, ENS (Energy Not Supplied). It also computes customer point indices such as the frequency of interruption, the duration, number of customers affected, average load and energy not supplied.

This module predicts the future system performance and helps a utility to plan, design and operate the distribution facilities in a cost-effective manner.

It is fully integrated in CYMDIST and provides a high degree of flexibility for analyzing distribution system configurations (“what-if” scenarios). It automatically traces the fault interrupting devices and the isolation points (normally open points). You have the option to include the “stuck” probability for the fault-interrupting device in the calculation of the indices.

This module studies the impact of single or multiple contingencies (forced or planned outages) on the electrical distribution system. It also finds the optimal switching plan to restore electrical power to priority customers and recover the maximum possible load in the affected circuits. The best switching plan is selected from all the alternatives, based on customer count, priority of the customers, and number of operations required, while ensuring that there are no abnormal conditions (overloading and under/over-voltages) on the system.

Users influence the optimal selection criteria by defining the relative importance of objectives like restoring power to the maximum load, restoring the maximum number of customers, restoring the highest priority customers or minimizing the number of switching operations. You also have the option to select the type(s) of switching devices that can be used to pick up load (such as only the remote controlled devices). You control the loading limits of each type(s) of component as well as the maximum and minimum voltage limits of the system.


This module is fully integrated in CYMDIST and assumes the initial starting state (loading and connectivity) to be defined by the active study in CYMDIST. Restrictions may be set on selected switching devices so they are not considered in the switching plan. Contingencies may be set at the substation, circuit or component level meaning, that you may study the impact of losing a transformer-bank in the substation or simply simulate a damaged component on the main feeder.


The proposed switching plan is shown graphically and you may replay (undo/redo) the proposed scheme and make modifications if desired. The proposed switching plan may be saved in a study file for later replay and a detailed customizable report is generated for in-depth analysis.

CYMTCC is the Windows-based Protective Device Coordination software package available from CYME International. CYMTCC is an advanced engineering tool, conceived to assist engineers in overcurrent protective device coordination studies. CYMTCC is designed to accommodate radial systems and can be used for both industrial as well as power distribution feeders. The graphical user interface of the package renders the program efficient and very user-friendly.

MARS (Management, Assessment and Restoration of Service) is a Windows based software which directs fast and well-organized restoration of electrical services after major system damage.

This innovative software creates an integrated, restoration plan following a devastating event, such as an ice or wind storm, flood, earthquake, loss of transmission, or loss of major substations. MARS is based on restoration "best practices", assisting where the complexity of restoration issues overpowers humain ability.

MARS redesigns a utility's system to isolate damaged wire and transfer priority customers to energized circuits. It reserves capacity on the redesigned circuits to pickup customers following each day's repairs. Next, it creates maps, field switching orders, and a prioritized list of work for line repair crews. MARS predicts restoration dates for all wire out of service, which can be used to keep customer informed.

MARS uses a real-time electrical model and a multi-objective reconfiguration algorithm to find the single, best restoration plan, not a long list of options. The MARS model is shared with the popular CYMDIST distribution planning software. The shared model contains normal load-flow model components, plus damage locations, work time estimates, available crew hours, customer counts, and priority customer locations.

Large cost savings can be achieved when MARS models are also used for CYMDIST engineering stidies, such as circuit growth (overload or low voltage), capacitor and switch placement, fuse coordination, reliability, etc.