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CYMDIST - Modules

ARC FLASH

The ARC Flash Hazard is an add-on module to our PSAF, CYMDIST and CYMTCC programs. This module is primarily designed to analyze and promote the electrical safety for employees working on or near electrical equipment. By increasing the understanding and awareness of electrical hazards, it is possible to minimize the risk of exposure to them and consequently avoid injury to individuals who work on or near electrical equipment.

PROGRAM FEATURES

This module computes the necessary parameters required to assess the risk level and adopt the adequate safety procedures.

It complies with industry recognized standards and methods for performing ARC Flash Hazard calculations namely:

  • The Electrical Safety Requirements for Employee Workplaces (NFPA-70E-2004).
  • Institute of Electrical and Electronic Engineers (IEEE-1584-2002).

The above guidelines facilitate the calculation of arc flash hazards in different types of equipment in various power systems.

Seamless Interface to PSAF, CYMDIST and CYMTCC

The bus data of any network created with our PSAF, CYMDIST and CYMTCC software can be supplemented with ARC Flash related information such as working distance, bus gap, connected equipment and exposed circuit in cubic enclosers or in open air.

In addition, the ARC Flash Hazard module calculates the maximum bolted (3) phase short circuit levels at the desired work place (Bus) for ARC Flash Hazard calculations.

Program Features

The ARC Flash Hazard module also utilizes our CYMVIEW Simulation Results Manager Program to generate the required results, including:

  • Incident Energy versus Distance with a constant clearing time.
  • Incident Energy versus Time with user defined distance.
  • Flash hazard boundary versus Time.

Warning Labels

The program generates reports that can be printed directly on ARC Flash Hazard weatherproof warning stickers.

These warning stickers include all the necessary information such as :

  • ARC Flash Hazard boundary.
  • Energy density .
  • Hazard / Risk category class.
  • Personal Protective Equipment (PPE).
  • Potential shock hazard.
  • Limited, restricted and prohibited approach boundaries.
  • Equipment identification.

Multiple label formats are available, and the module provides you with the capability to customize your own labels.

 

CYMDIST-MAP

CYMDIST-MAP is an add-on module to CYMDIST that allows you to display raster or vector map images (geographical land-base such as DWG, DXF, SHP, etc) 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.

 

CYMDIST-SOM

CYMDIST-SOM is an add-on module to CYMDIST designed to help distribution engineers determining the optimal feeder configuration in order to minimize losses, improve the voltage profile and balance the load between feeders. This module can determine the optimal location of the tie points by suggesting new locations (addition of switching devices) or recommended switching for existing devices in order to achieve the selected objective.

This module will suggest the closing/opening of existing switching devices or to place new ones to find the configuration that will minimize losses, hence lower the operating cost, while respecting the user-defined constraints such as voltage thresholds and loading limits. The module may also be used to recommend switching in order to minimize abnormal conditions such as overloaded equipment and low voltage conditions, and to minimize unbalanced loading among interconnected feeders.

Objective Functions

CYMDIST-SOM offers the following objective functions to the user:

  • Minimize Overload Exceptions to reduce the most severe overloads.
  • Minimize Voltage Exceptions to reduce the most severe voltage problems.
  • Minimize Unbalanced Loading to balance the loading among interconnected feeders.
  • Minimize Service Interruption Frequency to transfer portions of circuits among interconnected feeders.
  • Minimize KW Losses by either:
    • Global branch exchange: the program transfers the load by modifying the configuration of the tie points simultaneously in order to find a more efficient way to feed local customers. With this method the user can activate the option of adding new switches, which implies that CYMDIST will recommend new locations for the tie points.
    • Local branch exchange: the program transfers the load by modifying the configuration of tie points individually in order to find a more efficient way to feed local customers.

Optimal Network Configuration

The optimal configuration is automatically created as a case study and is presented graphically for an immediate evaluation of the proposed solution. A detailed customizable report is also generated for in-depth analysis.

 

CYMDIST-HARMO

CYMDIST-HARMO is an add-on module to CYMDIST designed to perform harmonic penetration analysis in electric distribution systems.

CYMDIST-HARMO features a number of analyses, including frequency scan, voltage distortion and current distortion calculations on balanced and unbalanced systems.

CYMDIST-HARMO allows the user to easily detect resonant frequencies due to capacitor banks, and to model non-linear loads and other sources of harmonic currents such as converters and arc furnaces. With these capabilities, it is possible to evaluate the impact of these non-linear loads on your distribution network.

It is specifically designed for utility-type grids and distribution feeders of any configuration.

CYMDIST-HARMO utilizes state of the art sparse matrix/vector methods with a three-phase nodal admittance network matrix representation.

The frequency scan can be performed at any joint of a feeder by simply selecting the desired section directly in the one-line-diagram and running the analysis.

CYMDIST-HARMO allows the users to model multiple types of harmonic sources to compute the effectiveness of filters and modify them at will in order to attain acceptable level of harmonic distortion on your network:

  • Ideal and non-ideal converters
  • Arc furnaces
  • Single-tuned and double-tuned filters
  • C-type filters
  • High-pass filters
  • User-defined shunt single and multi frequency sources

Analytical Capabilities

  • Voltage Harmonic Distortion
  • Current Harmonic Distortion
  • Impedance vs. frequency analysis
  • Phase or sequence analysis
  • Calculation of telephonic indices (TIF, ITIF, etc.)
  • Selection of line/cable models: series R-L, nominal PI, transposed distributed parameters, etc.
  • System detuning analysis
CYMVIEW, Simulation Results Management
CYMDIST is equipped with CYMVIEW which generates any kind of charts for all the analysis modules including the CYMDIST (HARMO) Module plots such as:

  • Impedance magnitude plots versus frequency.
  • Phase Angle plots versus frequency.
Both of the above charts can then be utilized for resonance and de-tuning analysis.

 

CYMDIST-RAM

CYMDIST-RAM is an add-on module to CYMDIST designed to aid distribution engineers in assessing the reliability of electric distribution networks.

The program computes a set of predictive reliability indices for the overall system and their corresponding protection zones such as MAIFI, SAIFI, SAIDI, CAIDI, ASAI, ENS (Energy Not Supplied), AENS and LEI.
It also compute customer point indices such as the frequency of interruption, the duration, etc., for each customers. CYMDIST(RAM) features a module to calibrate the predictive model based on historical data. This fucntionality is very handy to adjust the failure rates and repair time for the overhead lines and cables in order to match the simulated model with historical indices.

Another option allows to display all historical failures data on the diagram and color code it based on the number of outages, the causes, the type of failures, etc.

This module is fully integrated in CYMDIST and provides a high degree of flexibility for analyzing distribution system configurations.

Reliability System Data

In addition to the equipment data already modeled in CYMDIST (ratings, impedances), the outage data for the different components must be specified as follows:

  • Failure rate (sustained and momentary)
  • Repair time
  • Switching / isolation time
  • Stuck probability (on protective and switching devices)
The outage data can be computed and calibrated (adjusted) using historical data and can be furthermore modified graphically in various ways to reflect the impact of a tree trimming campaign by defining environmental factors to affect failure rates, and repair times at specific locations.

Calculation of the Reliability Indices

Using either historical data or user-defined failure data the program can compute the different system and load point indices taking into consideration the re-closing scheme (fuse saving or fuse clearing) and the re-closer settings (single-phase trip, three-phase trip, individual phase lock-out, all phases lock-out, etc.).

Restoration may be enabled by using the pre-contingency load flow. The automation of some switching devices will impact the restoration time.

Indices are automatically calculated at the feeder level, zone level (start of a protected zone) and customer level.

The network one line diagram can be color coded based on any of the computed indices as a reference.
This allows the visual identification of areas where the number of interruptions or the outage time exceed the predefined standards.

It also features a mode to compare the results of two studies and report the difference in results graphically. This allows the user to evaluate the improvement in reliability due to the installation or relocation of equipment, effect of tree trimming, etc. as compared to the base case.

What-If Scenarios

CYMDIST (RAM) provides a high degree of flexibility for analyzing various distribution system configurations (“what-if” scenarios). The effects of network modifications can be analyzed to measure the improvement in reliability indices. The reports include numerous graphical reports showing the reliability indices by color as well as customizable tabular reports.

Reliability assessment has become important for utility planners in recent years. Improved service reliability might be motivated by government regulation or by market competition, but providing superior service at an attractive price is in the interest of both the utility and the customer.

 

CYMDIST-CAM

CYMDIST-CAM is an add-on module to CYMDIST designed to study the impact of single forced or planned outages on the electrical distribution system. It finds the optimal switching plan to restore electrical power to priority customers and to recover the maximum possible load in the affected areas.

This module is fully integrated with 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.

Objective Functions

The optimal selection criteria and priority path of CYMDIST (CAM) is defined by a ranking-based search method that handles multiple objective functions. In order to define the relative importance of each objective for your particular case, a weight is assigned to each of the following objectives:

  • Minimize the Number of Switching operations
  • Maximize the Total Load Restored
  • Maximize Feeder Spare Capacity
  • Maximize Component Spare Capacity
  • Minimize Restoration Path (Distance)

Proposed Restoration Plan

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 the user-defined constraints are respected, such as there are no abnormal conditions (overloading of equipment and voltage violations) on the system. The program provides a report that identifies the weak points on the feeders (limiting components) and the total customers exposed beyond these points. This allows you to modify the components and replay the simulation without the limiting components.

The restoration mode provides the options to either pick-up the un-served customers through "switching" (switching plan) or through "repair". The main difference is that the "repair" option does not transfer load to the adjacent circuit. Instead, it uses the "cold load" pick-up factors of the different type of loads in order to suggest a two-step sequence to restore the customers without power. For both options, 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.

 

CYMDIST-SUB/SUBNET

CYMDIST-SUB/SUBNET is an add-on module to CYMDIST that provides the user with the capability to model all the major components of the distribution substation and any sub-network such as the detailed modeling of an industrial facility.

Substation Modeling and Analysis

The graphic editor of CYMDIST is utilized to build the One Line Diagram of the substation. This includes the representation of bus bars, multiple transmission line feeds, power transformers, tie points and protective devices.

The distribution feeder sources are now the transmission lines feeding the substation. The impact of all components of the substation as well as all components of the feeders connected to it are now taken into consideration during the analysis.

The substation allows the user to analyze the effects of a change in the nominal operating condition of one feeder on another.

A typical example would be the voltage profile of one feeder due to a fault on a section of another feeder connected to the same substation.

Sub-Network Modeling and Analysis

CYMDIST-SUB/SUBNET on the other hand also allows the user to model sub-networks such as a detailed representation of an industrial facility. These sub-networks are considered to be a continuation of existing network feeders.

CYMDIST-SUB/SUBNET is fully integrated into CYMDIST for Voltage Drop, Short Circuit, Load Allocation and Capacitor Placement analysis on both radial and looped systems. The analysis results for the equipment, including any color coded abnormal conditions, within the substation and the sub-network can be posted on the network one line diagram and in the reports.

 

CYMDIST-SNA

CYMDIST-SNA is an add-on module to our Distribution System Analysis Software. It is designed to perform the Power Flow and Short Circuit Analysis of heavily meshed secondary network distribution systems for any voltage level.
The SNA module enables the user to build the secondary grid by including the complete vaults with their transformers and protective devices, the secondary lines or cables, as well as the distribution transformers.

CYMDIST-SNA  utilizes the graphic editor of CYMDIST to model the secondary network and display the results of the power flow and short circuit simulations on the single line diagram. Any portion of the system can be selectively visualized in detail and system-wide results can be viewed for any type of simulation.

The module also includes a comprehensive suite of presentation tools for selective visualization and effective management of large data sets, like spreadsheets, rapid graphics and a multitude of context-dependent reporting facilities such as:

  • Full voltage drop and short circuit reports,
  • Overloaded conductors and devices,
  • Abnormal Conditions,
  • And others.

Unique Capability

CYMDIST (SUB/SUBNET) and CYMDIST (SNA) greatly enhance the capability of our distribution analysis software by including, in addition to the primary feeders, the substation detailed representation and the secondary grids all the way down to the customer transformers.

 

CYMDIST Gateway

YOUR KEY TO MORE POWER...

About CYMDIST and CYMDIST Gateway

Used worldwide, CYMDIST is a power engineering simulation tool to analyze distribution systems. With CYMDIST Gateway you enhance your software investment by providing your power engineers accurate and comprehensive electrical connectivity data.

Your organization has the
CYMDIST world-renowned distribution analysis software and your IS/IT team has a great “GIS view” of your electrical power network; then, CYMDIST Gateway is for you !

Recognizing the need for power engineers to be able to perform up to date network analysis, CYME has developed a tailored link to your GIS data called the CYMDIST Gateway.

Developed in-house, it will provide you a robust solution that will endure through time as CYMDIST Gateway, CYMDIST and your GIS system evolve.

Total flexibility... whether you need to extract your network information from your GIS system by circuits, groups or any of your categories, your CYMDIST Gateway solution will deliver. Along with your network connectivity, you can elect to include switch status or customer loads or any combination at your own discretion.

Be it for operational analysis purposes from up to the minute network information, or for planning purposes from network behavior over time periods, the CYMDIST Gateway has the power you need.

CYMDIST Gateway, Intelligent Interface Solution

CYME CYMDIST Gateway is as an enduring solution for the creation and the maintenance of the CYMDIST distribution network data model. With it, 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.

CYMDIST Gateway provides a generic interfacing method with the libraries of your enterprise GIS. There is no need for the CYMDIST Gateway to be controlled from within the GIS; it is a stand-alone solution that features a data manipulation engine reading the GIS data format. It builds the network connectivity without using proprietary code and generates the files needed by CYMDIST.

Some Key Features

  • Simple and intuitive user interface.
  • Customized link to your GIS system.
  • Rigorous data mapping process.
  • Extraction and validation of the connectivity and equipment data from your GIS database.
  • Extraction based on feeders, substations or areas.
  • Extraction of the normal or actual switch status.
  • Extraction of customer load data and profiles.
  • Scheduled updates.
  • Links to major GIS vendors.
  • Automated load allocation pre-processing (optional).
  • Field proven solution.