Protection Functions

A comprehensive relay library based on manufacturer-specific protection devices is available and can be used in steady-state and for dynamic simulation. The protection device models are highly detailed and completely aligned with StationWare, allowing settings exchange with real protection devices. A range of protection concepts is supported, including time-overcurrent, distance, differential, directional, over-voltage and under-voltage, over-frequency and under-frequency, out of step protection and power swing blocking. Various graphical representation of protection device characteristics are available such as Overcurrent-time diagram with drag & drop functionality, R-X diagrams and diagrams for differential protection. Validation of selected settings can be done graphically via Time distance diagrams or with Overcurrent-time diagrams, or automatically via protection audit tools. Selected settings can be reported in tables and exported for further investigation.


Protection Functions are offered in two packages:

  • Basic and Time-Overcurrent Protection package
  • Distance Protection package
  • Comprehensive relay library with relay models suitable for steady-state, RMS and EMT calculations
  • Synchronisation with StationWare
  • Highly-detailed spreadsheet reports for protection settings (overcurrent, distance, voltage, frequency protection)
  • Graphical visualisation and editing of fuses, relays, CTs and VTs including auto layout functionality
  • Protection Audit
    • Validation tool for protection settings and configurations
    • User-configurable fault types assessment
    • Automatic determination of protection topology
    • Automatic short-circuit calculation
    • Multiple predefined reports with auto-identification of critical protection settings (device coordination, device tripping times, fault clearing times)

Time-Overcurrent Protection

  • Overcurrent-time diagram with drag & drop functionality including auto-generated graphical legend
  • Cable and transformer damage curves
  • Motor starting curves
  • Automatic display of measured currents
  • Steady-state response checks
  • Steady-state short-circuit simulation with tracing of individual steps
  • Steady-state tripping times for transient or sub-transient current/voltage values
  • Transient response checks (requires Stability Analysis functions (RMS) or Electromagnetic Transients
    functions (EMT))
  • Protection model features
    • Fuses and low-voltage circuit breakers
    • Positive-, negative-, zero-sequence inverse and definite time characteristics
    • Thermal overload characteristics
    • Directional elements supporting cross-, self- and memory polarizing, Wattmetric method
    • Differential unit with harmonic blocking for multiple harmonic orders
    • Generic and detailed manufacturer specific recloser units
    • Signal transmission between relays, inter-tripping,interblocking schemes
    • Detailed CT, VT and CVT models including saturation
    • Over-, under-voltage inverse and definite time characteristics
    • Programmable logic unit
    • Over-, under-frequency and df/dt inverse and definite time characteristics (requires Stability Analysis functions (RMS))

Distance Protection

  • Includes time-overcurrent protection
  • R-X diagrams supporting the display of measured impedance trace
  • Time-distance diagrams, with metric or calculated display of zone reach in forward and reverse direction
  • Protection Coordination Assistant
    • Automatic calculation of protection settings
    • Support of various coordination methods and setting rules
  • Protection model features
    • Generic and detailed manufacturer specific Mho, polygonal distance zones and distance starting units
    • Out of step detection and power swing blocking unit (requires Stability Analysis functions (RMS) or Electromagnetic Transients functions (EMT))