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The function simulates many short circuits, for different locations, types and with different arc resistance. A number of parameters can be specified in the Options, via Calculation | Grid Analysis on the Voltage Dip Analysis and Protection Analysis and Protection Analysis tabs . The parameters are:
•Location: at selected nodes and in selected cables/connections (to be set via Number of cable/connection steps)
•Type: single-phase, two-phase, three-phase (to be set via Number of faults)
•Bow resistance: 0 Ohm and two additional (second additional not for cables)
•Sequential reject: 1 or 2 levels (set via Reject level)
The analysis focuses on the primary results per fault. During the shutdown sequence it looks at:
•Which protections switch off at what time
•Thermal load of branches (I²t)
•Current of branches after completion
The function simulates short-circuits on Fault Objects, such as nodes, connections and cables and reports on undesired events, such as:
•Wrongly tripping protections
•Not tripping protections
•Late tripping protections
•Remaining (persistent) fault current after switching off
•Unavailable nodes after switching off
•Thermal overload before, during and after switching off
•Current overload after switching off
Reported by fault over:
•Causes: undesirable events in the grid (unavailable nodes, thermal overload, current overload, unjustified, not or late tripping of protective devices or residual fault current), related to short-circuits on the Fault object
•Consequences: undesired events on the Consequence object (unavailable nodes, thermal overload or current overload), due to short circuits on nodes or cables/connections in the grid.
If the results are viewed by right-clicking on an object, that object is the Fault object in the lists of Items and Causes and the object is the Consequence object in the list of Consequences.
See also: