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 and drop functionality, R-X  and P-Q 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.

• Comprehensive relay library with relay models suitable for steady-state, RMS and EMT¹ calculations
• Synchronisation with DIgSILENT 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)
  • Short-Circuit Trace functionality for steady-state simulation of fault clearance and relay responses

¹Requires Stability Analysis Functions (RMS) or Electromagnetic Transients (EMT) licence

• 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))¹
• Protection Graphic Assistant
  • Customisable short-circuit sweep diagrams including visualisation of protection settings
• Protection Coordination Assistant
  • Automatic calculation of overcurrent protection settings
  • Support of various coordination methods and setting rules, including user-defined rules
• 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 polarising, 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, combined 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 characteristics²

¹Requires Stability Analysis Functions (RMS) or Electromagnetic Transients (EMT) licence

²Requires Stability Analysis Functions (RMS) licence

• Requires Time-Overcurrent Protection
• P-Q diagrams and R-X diagrams with support of the display of measured impedance trace
• Time-distance diagrams, with metric or calculated display of zone reach in forward and reverse direction
• Protection Graphic Assistant
  • Reach of protection zones colourings in diagrams
• Protection Coordination Assistant
  • Automatic calculation of protection settings
  • Support of various coordination methods and setting rules, including user-defined 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 unit¹

¹Requires Stability Analysis Functions (RMS) or Electromagnetic Transients (EMT) licence