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Relay Coordination

Protection Device Selectivity & Coordination Analysis

protective device coordination

ETAP STAR provides intelligent protective device coordination and device selectivity. STAR has an intuitive and logical approach to Time Current Characteristic (TCC) analysis with features and capabilities such as user-friendly graphic interface, equation-based device modeling, an extensive device library that is Verified & Validated, analysis tools embedded within STAR, and integrated rule-based design.

ETAP STAR assists with identifying potential false trips, relay mis-operation (relay coordination), and mis-coordination.

A first of its kind, Sequence of Operation , enables users to visually identify which device operates in order, given the location of a fault anywhere in the system. It enables a documented path for backup devices in case the primary protective device fails to trip. This highly-intelligent tool, provides a method to theoretically test all protective device settings and double-check coordination plans.

» Download Device Coordination PDF

Device Protection, Coordination and Selectivity Software

Device Coordination Capabilities

  • AC & DC device coordination
  • Incorporates ANSI & IEC standards
  • Phase and ground coordination views
  • Graphically adjustable (to device limits) settings
  • Extensive device libraries
  • Integrated with one-line diagram & short circuit analysis
  • Intelligent alerts for troubleshooting
  • One-click short circuit analysis
  • Seamless motor acceleration tie-in
  • Includes voltage and current differential protection
  • Modeling of multi-function & multi-level relays
  • Animated of sequence-of-operation playback
  • Plots shifted based on fault contributions
  • Extensive damage curve modeling & plotting
  • Professional time current characteristic plots
  • Color-coded device setting reports
  • Two-way interface with relay test sets

Device Protection, Coordination and Selectivity Software


  • Visualize system-wide coordination
  • Graphically adjust curve settings
  • Automatic plot scaling for current & voltage
  • Coordination plots include embedded one-line diagrams
  • Automatic layout of the one-line diagram in coordination plots
  • Display arc flash analysis results curves on coordination plots
  • Multi-axis time current curves
  • Curves automatically color sequenced
  • Cross-hair pinpoint tool
  • Graphical time difference calculator
  • User-selectable fault arrows
  • Model transformer inrush and damage curves
  • Includes generator damage and decrement curves
  • Motor curves based on starting voltage
  • Damage curves for motor & stator
  • Clip curves automatically from calculated or user-defined fault current
  • Minimum fault current calculation
  • Detailed print settings, legends, & device labeling
  • Automatically batch-print plots to multiple printers/sizes

Protection Device Selectivity & Coordination Analysis

Sequence of Operation Software

Settings and device selectivity of protective devices and associated equipment is evaluated using Sequence of Operation. Sequence of Operation then enables users to verify and confirm the operation of the protective devices for any location and for any type of fault.

Operating times are calculated based upon settings characteristics, and device interlocks for a specified fault location and type.

Sequence of Operation Functionality

  • Fault placement is user definable
  • Graphically view device operation sequence
  • Visualize device failure & secondary device operation
  • Detailed relay actions for multiple types of relays including:
    27, 49, 50, 51, 51V, 59, 67, 79, 87
  • Operating devices blink on the one-line diagram
  • System wide coordination is illustrated
  • Tabular operating time summary
  • Graphical Animation of Protective Device Operation
  • Calculate & display the fault current automatically
  • Evaluate devices based upon through-fault current

Normalized time current curve shift graphically displays curves in relation to one and another for a given fault

Sequence of Event Viewer

The operating sequence for devices is automatically calculated based upon the fault location, and operating status (breaker and switch settings) of the system. This is dynamically linked with the electrical one-line diagram to perform a complete set of actions to respond to a fault This includes internal shifting (normalizing) of each time current curve based upon the fault contribution level for each device individually.

» Download Device Coordination PDF

ETAP Balkan, Nispetiye Mahallesi, Gazi Güçnar Sokak, Uygur İş Merkezi, No:4A, Beşiktaş, İstanbul 34340 TURKEY