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    Transient Security Assessment Tool

    TSAT is a leading-edge electromechanical time-domain simulation tool designed for comprehensive assessment of dynamic behavior of power systems. TSAT includes a rich model library, state-of-the-art solvers, useful analysis features, and a highly intuitive user interface. Like VSAT and SSAT, TSAT can be used to calculate transient security limits under specified criteria, contingencies, and transfer conditions.



    • Studies involving rotor angle, voltage, or frequency stability
    • Transmission system design and operation studies including transient security limit assessment
    • NERC compliancy studies (such as TPL, CIP, etc.)
    • IPP and renewable integration studies
    • Development and validation of system models
    • Design and setpoint determination of special protection systems
    • Control tuning and protection coordination
    • Streamlining of PMU data using the ePMU add-on module
    • Post-mortem analysis of incidents
    • On-line transient security assessment… more on on-line application



    • Full nonlinear time-domain simulation engine with choice of numerical integration methods
    • Security assessment based on criteria for transient stability, damping, transient voltage/frequency, relay margins, and others
    • Comprehensive model library, including user-defined models, renewable generation models, special protection system models, and FACTS/HVDC models
    • Determination of 1-dimensional and 2-dimensional transient security limits
    • Capabilities for processing multiple contingencies, transfers, and study scenarios in single analysis session
    • Wide selection of contingency types and system quantities for monitoring
    • Post-simulation processing tools, such as stability index calculations, Prony analysis, etc.
    • Easy-to-use graphical interface for data setup, program operation, and output analysis
    • Distributed computation for processing large number of contingencies and transfers
    • Compatibility with major third-party input data formats

    TSAT Brochure