DEW/ISM Product


maui_google_earth_webDEW/ISM can model every sectionalizing device, from substation to switching cabinet, and every rooftop PV generator. Models with millions of components can be analyzed. Measurement data – including EMS, SCADA, AMI, DG generation, outage, lightning, weather, radar weather, and others – from 1 second to 1 minute to 1 hour, can be processed in time-series analysis. Time-varying characteristics and turn-on/turn-off behavior of loads, such as electric vehicles, can be included.

DEW/ISM analysis and design applications work over time-varying behavior. A circuit server can create the model, supporting distributed processing and analysis automation. The major DEW/ISM benefits that customers get are the accuracy of the model that may be achieved, the measurement data that can be processed, and the ease of model access.

With DEW/ISM, customers can color the model view by circuit, phase, component type, and variable range display; easily check and update electrical connectivity in their model; run analyses and set display-view to include all or only selected circuits in the model; search/pan to location by component (name, type, etc.) or geographical coordinates; and show selected analyses results directly at applicable model components.

Standard Product Features and Applications

Power Flow

Power Flow solves both IEEE standard distribution and transmission system circuits, with the capability to solve downtown meshed networks for major cities in less than one second. Power flow supports real-time solutions with distributed computations, validated on systems with more than one million multi-phase nodes and thousands of loops. It can also utilize interfaces to National Renewable Energy Lab and Clean Power Research to incorporate historical and forecasted solar generation data.

The supporting impedance calculations for conductors can be modeled from first principles, as a function of actual construction, environmental, and operating conditions, or can be simply modeled using standard data values per unit length. Load estimation is used to combine circuit measurements, kWHr measurements, load research statistics, single large customer (kW, kVar, kVA) load measurements, special load measurements, and load growth factors (either for entire circuit or individual load) to estimate kW and kVar loading for every customer as a function of time.

Network Fault Analysis

Network Fault Analysis calculates fault currents for radial and looped systems, utilizing the Power Flow application. It works for multiple substations looped together and analyzes fault currents from distributed resource generators.

DER Assessment

DEW/ISM’s Generation Impact Analysis performs a series of power flow analysis runs associated with loss and restoration of user-selected generation types, operating at rated conditions, and load conditions evaluated at both minimum and maximum for a selected feeder.

Using the analysis module, the planner can perform semi-automated studies of interconnection requests that are aligned with industry standards, such as IEEE 1547. Our engineers can either train the utility planners to do the studies themselves or we can provide the service ourselves. Either way, using DEW/ISM is a low cast and efficient option for utilities to handle the ever increasing volume of interconnection requests.

CapacitorGrid_GE_Overlay_web Design

Calculates the size and location of capacitors needed to satisfy power factor and voltage magnitude specifications.

Flicker Analysis

DEW/ISM’s flicker analysis application calculates voltage dip percentages resulting from any number of loads cycling, and compares them with standard flicker, or under specified curves. It automatically calculates sizes for various load types that result in flicker.

Phase Balancing Design

DEW/ISM’s phase balancing design predicts the best phase move, then the second best move, then the third, and so on. It can be performed at both start-of-circuit and tie switches.

Protection/Coordination Design

The protection/coordination design application automatically locates protection and coordination problems within a circuit. It automatically searches the database to find a list of devices that will coordinate, displays zones of protection, and can update circuit protective devices from within application.

Circuit/Schematic Viewer

Generates and views a schematic reduction of the modeled system.

Google Earth 

Overlay the DEW model onto a Google Earth view of the geographical location.

Component Settings Manager

The DEW/ISM Component Setting Manager is a utility that supports the management of individual device settings for the production model. The settings are automatically loaded onto the model based on user preferences.

Measurement Selector

This utility allows the user to manage sets of measurements like SCADA and generator output, for use while performing studies.

Add-On Options

Data Management Package

  • DEW Component Manager simplifies engineering parts management, providing a convenient interface for managing part definitions.
  • Data Mapping provides the interface between the client’s GIS system and the DEW/ISM Circuit Builder. It is used to extract the pertinent topology information from the GIS records and create an associated circuit component in DEW/ISM.
  • Circuit Builder takes the output from the data mapper and creates circuit models that make up the feeder in the integrated systems model.

Load Management Package

  • Transformer Load Management analyzes distribution transformers loading to determine min/max conditions and percent loading utilization.
  • DEW/ISM Load Planning Tool is used to combine the multiple sources of customer load data into a common data set for loading over a 12-month planning hoirzon. It semi-automates the process of combining data from interval meters and monthly consumption meters into a uniform load model and then loads that data onto the integrated systems model.

Secondary Analysis Package

  • Optimum Sizing calculates size of distribution transformers and secondary system conductors for supplying mixed customer load classes with minimum capital investment and operating costs.
  • Secondary Flicker Analysis determines flicker tolerances at a distribution transformer due to secondary motor loading.

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