Distribution Network Analysis (CYMDIST)


The CYMDIST Distribution Analysis software performs several types of analysis on balanced or unbalanced three-phase, two-phase and single-phase systems that are operated in radial, looped or meshed configurations. It includes a full network editor, as well as:

  • Unbalanced load flow
  • Comprehensive fault analysis
  • Load balancing
  • Load allocation/estimation
  • Optimal capacitor placement

The software workspace is fully customizable. The graphical representation of network components, results and reports can be built and modified to supply the level of detail needed. Innovative engineering technologies, industry practices and standards are at the core of the CYMDIST algorithms, flexible user interface and extensive libraries.

Furthermore, the CYME COM module allows the environment of your choice to communicate with the CYMDIST software to access different pre-defined functions and calculations.

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The CYMDIST Distribution Analysis software is a suite of applications composed of a network editor, analysis modules and user-customizable model libraries from which you can choose to get the most powerful solution.

The program is designed for planning studies and simulating the behavior of electrical distribution networks under different operating conditions and scenarios. It includes several built-in functions that are required for distribution network planning, operation and analysis.

The analysis functions such as load flow, short-circuit, and network optimizations are performed on balanced or unbalanced distribution network that are built with any combination of phases and configurations.

Optional add-on modules allow performing more in-depth analyses such as reliability analysis, contingency analysis, harmonic analysis, switching (tie-points) optimization, and more.

The CYMDIST analysis software is an extremely powerful tool to assist you in creating “what-if” studies and performing simulations to evaluate the impact of modifications to the system.

All the data resides in standard SQL tables and XML files so it can be easily populated or queried by third parties applications. CYMDIST can be interfaced with or embedded in other applications such as AM/FM/GIS system, DMS, NMS, OMS or SCADA systems and is available as a Microsoft ® Component Object Model (COM) for integration with other COM-compliant applications.



Features and Capabilities

  • Power flow and voltage drop analysis
  • Short-circuit analysis
  • Optimal capacitor placement and sizing
  • Load balancing and load allocation/estimation
  • Steady-state analysis with load profiles
  • Harmonic analysis
  • Network configuration optimization
  • Advanced Project Manager and Network Forecaster
  • Distributed generation modeling
  • DER impact evaluation
  • Network Disturbance Assessment D-A-CH-CZ
  • Techno-economic analysis
  • Distribution state estimation
  • Integration capacity analysis
  • Long-term dynamics analysis
  • Volt/VAR optimization
  • Reliability analysis (predictive and historical)
  • Optimal voltage regulator placement
  • Optimal recloser placement
  • Single contingency analysis with restoration
  • Substation modeling and analysis
  • Secondary grid network analysis
  • Low-voltage distribution network modeling
  • Arc flash hazard assessment
  • Protective device coordination verification
  • Minimum fault protection analysis

Analytical Capabilities – CYMDIST Core Modules

  • Balanced and unbalanced voltage drop and short-circuit analyses (radial, looped or meshed)
  • Fault current calculations for RMS, asymmetrical and peak values for all shunt fault configurations
  • Short-circuit and fault voltage analysis throughout the network taking into account pre-fault loading conditions
  • Optimal capacitor placement and sizing to minimize losses and / or improve voltage profile
  • Load balancing to minimize losses
  • Load allocation/estimation using customer consumption data (kWh), distribution transformer size (connected kVA), real consumptions (kVA or kW) or the REA method. The algorithm supports multiple metering units as fixed demands and large metered customers as fixed load.
  • Motor starting analysis (voltage dip and maximum motor size allowable)
  • Flexible load models for uniformly distributed loads and spot loads featuring independent load mix for each section of circuit
  • Load growth studies for multiple years
  • Feeder interconnection for load transfer simulations
  • Phase merging capability
  • Automatic re-conductoring and re-phasing of multiple selected sections
  • Computes load equivalents and network equivalents to ease the analysis of large networks, matching exactly the power flow and short-circuit results of the non-reduced network
  • Distributed generation modeling, generator impedance estimation, grid side control and protection functions

Simulation Results

The CYMDIST software offers a wide variety of graphical reports and color-coding of the one-line diagram for over/under voltage conditions, overloaded equipment, isolated sections, fault levels, voltage levels, etc.

The reporting facilities of the CYMDIST software allow to fully defining the analyses results into web reports. The software includes a variety of report templates for all types of analyses. You can combine any reports, and create new ones, utilize any of the CYMDIST software variable and create your own mathematical expressions using any of those variables, which further extends the reporting possible.

In addition, the software generates graphs of the phase voltage, fault current, reactive power and apparent power profiles from the substation to the selected section.

CYMDIST Additional Modules

Automated Network Forecast Analysis: to create, view and  modify time-dependent projects (using the CYME Advanced Project Manager) consisting in modifications to the network such as the addition of any load at a given date, change/replacement of power transformers within a substation, a rephasing/reconductoring project, network switching or reconfiguration, etc.

Advanced Project Manager: supports the collaborative and detailed preparation of a project that consists in modifications to the network with related simulations.

Steady State Analysis with Load Profiles: to perform time range analysis based on a combination of historical consumption patterns and real-time monitoring.

Distribution State Estimator: to analyze the unbalanced power flow and the voltages at every level of a distribution power system.

Reliability Assessment: provides a framework within which predictive and historical reliability assessment scenarios are run and the impacts of the related investment such as DA (Distribution Automation) can be evaluated and understood.

Techno-Economic Analysis: facilitates the evaluation of the feasibility of a project, based on the factual network model.

Transient Stability Analysis: to simulate the dynamic behavior of distribution systems with distributed generation under various transient events (fault application/clearing, large motor starting, disconnection of co-generation units, islanding, etc.)

Harmonic Analysis: to perform harmonic penetration analysis in electric power systems. It features single phase and full three-phase modeling capabilities and includes a large library of pre-defined models for network equipment and harmonic current sources. The Frequency scan capability included in this module is also available as an independent module.

Arc Flash Hazards Analysis: to analyze and promote the electrical safety for employees working on or near electrical equipment. It computes the necessary parameters required to assess the risk level and adopt the adequate safety procedures.

Motor Starting Analysis: for the dynamic, locked rotor and maximum start size analyses dedicated to simulating the effects of induction and synchronous motor starting in three-phase electric power systems.

Load Flow Contingency (N-p): to assist in power flow related static contingency analysis. To create contingency events and single- or multiple-outage scenarios and compare to a base case.

Long Term Dynamics Analysis: allows power engineers to properly assess the impact of Distributed Energy Resources integration and to better understand related technical issues such as var control and voltage regulation.

Integration Capacity Analysis: addresses DER and load interconnection issues by determining the maximum allowable capacity that can be added at any point of the network without violating a set of constraints. Allows to quickly assess the hosting capacity of the network and filter out interconnection requests that are non-compliant.

EPRI DRIVE™: the calculation method provides aggregate and granular hosting capacity results for each distribution feeder and considers numerous circuit-specific attributes.

DER Impact Evaluation: assists engineers in their generation interconnection system impact studies. The analysis automates a series of time-consuming, repetitive and error-prone verifications and returns insightful results that clearly identify violations.

Network Disturbance Assessment D-A-CH-CZ: to determine the acceptability of a new load or generator interconnection by evaluating its impact on a series of power quality criteria.

Volt/VAR Optimization: assists in finding optimal settings for Volt/VAR control devices to optimize distribution networks.

Protective Device Analysis: the module provides engineers with a wide range of tools to efficiently and accurately design and validate the coordination scheme of their power system.

Optimal Recloser Placement: to place reclosers at locations to improve the network conditions based on selected objectives.

Optimal Voltage Regulator Placement: to place regulators at locations to improve the network conditions based on selected objectives.

Voltage Stability: to assess the ability of a power system to maintain stable voltages under different contingencies and loading conditions.

Network Configuration Optimization: assists in determining the optimal feeder configuration that will minimize losses, improve the voltage profile and balance the load between feeders.

Single Contingency Assessment and Restoration: to study the impact of single forced or planned outages on the electrical distribution system and find the optimal switching plan to restore electrical power to priority customers and to recover the maximum possible load in the affected areas.

Enhanced Substation Modeling: to model all the major components of the distribution substation and any sub-network such as the detailed modeling of an industrial facility.

Secondary Grid Network Modeling and Analysis: allows the power flow and short circuit analyses of heavily meshed secondary network distribution systems for any voltage level.

Low-Voltage Distribution Network Modeling: to model in detail low-voltage distribution systems within a one-line diagram.

Geographic Overlay: to display raster or vector map images (geographical land-base such as DWG, DXF, SHP, etc) as layers directly underneath the electrical model.

Online Maps Service: complements the CYME Geographic Overlay module and provides the capability to display Google™ maps and MapQuest™ Open maps as layers underneath the geographical view of your electrical network model.

Complementary Solutions and Modules

CYME COM module:as a programming language-independent process, the CYME COM module allows the environment of your choice to communicate with the CYMDIST software to access different pre-defined functions and calculations.

CYME Gateway: CYME Gateway is the CYME solution for the creation and maintenance of the  network data model. The connectivity network extracted from the GIS is accurate, electrically complete, with actual loads and switch status; and this network model can be updated easily.

CYME for ArcGIS Desktop™: this solution is an out-of-the-box toolbar that seamlessly integrates into the ArcGIS Desktop™ framework to embed power systems analytics into your GIS environment. Along with the CYME Server solution, it offers powerful analytical ability, meeting the need for answers in a prompt manner.

CYME Server: brings the CYME network model and analysis engines into your IT environment to facilitate the widespread and efficient use of this powerful engineering analysis tool. These advanced applications allow system operators to respond quickly and decisively to changing network conditions and threats while driving significant improvements in network efficiency and reliability.

CYMTCC: addresses Time Over-Current protection for Industrial, Commercial and Distribution Power systems. Features a direct interface to CYMDIST to verify the coordination of protective devices, the maximum permitted operating time («Reach») and the maximum permitted continuous load current.

Integration and Custom Software Development

We can help your staff successfully deploy off-line and real-time power engineering software solutions and integrate them with other enterprise systems.

System experts from Eaton are available on-site to ensure that all necessary aspects of the most efficient system integration are covered, according to your specific environment. We will assist you from start to finish.  This assistance starts at the requirement evaluation and continues with system analysis, specifications, project management, testing, physical installation right up to the time the system goes into production, and training.