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This element simulates the short circuit indicator in a distribution network. This indicator operates when performing a single node IEC short circuit calculation and a fault analysis with a single fault. The currents in the network in case of a short circuit at a single node are compared with the trigger currents of the short circuit indicators. The symbol colour changes if the calculated current is larger than the trigger current.

 

The short circuit indicator is represented by one or more little balls, placed on a transverse dash. The number of balls depends on the trigger current:

•0 - 150 A: one ball

•150 - 250 A: two balls

•250 - 500 A: three balls

•from 500 A: four balls

 

A short circuit indicator can be placed at both ends of a branch or at an element.

To add a short circuit indicator: select one branch or element together with the corresponding node and choose: Insert | Short circuit indicator.

The symbol of the short circuit indicator can be moved to the other side of the branch by dragging it with the mouse.

 

One copied short circuit indicator can be pasted into more feeders (combinations of a nodes and branches and\or elements). Select the feeders to which the short circuit indicator should be copied and choose: Start | Clipboard | Paste special | Paste switch in all selected fields.

 

Signalling a short-circuit current by a short-circuit indicator can be implemented with a directional sensitivity. This is used by the protection calculation - single fault, which shows which short circuit indicators have 'tripped'.

 

 

PARAMETERS

 

General